比利时专利BE1019676A3 SAW THREAD AND A SPOOL SAW THREAD WITH ADHESIVE AND A METHOD TO PREVENT CLAMPS.

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专利摘要:
A spool of saw wire is proposed which contains some adhesive in a zone on the outermost visible turns for the purpose of immobilizing at least a portion of the last turns of the saw wire on the spool. This zone can be a dot of adhesive around the free end of the sawing wire. This zone can also be a ring from one end of the coil to the other end. This zone can also be a peripheral ring around the outermost layers of turns. This zone can also be spirally present on the outermost layer. Only the outer layers can be coated with adhesive, or all bearings in the entire coil can be treated with adhesive. The adhesive must hold the wire strong enough to prevent the movement of the turns of the wire during packaging, transportation, assembly, and when using the spool of saw wire, but should not interfere with smooth unwinding. In view of this, clear limits of the amount of adhesive present are defined.
公开号:BE1019676A3
申请号:E2011/0256
申请日:2011-05-02
公开日:2012-09-04
发明作者:Carlo Cloet
申请人:Bekaert Sa Nv；
IPC主号:

专利说明:

Title: Saw wire and a coil of saw wire with adhesive and a method to prevent pinching
Description
Technical scope
The invention relates to a coil of saw wire, possibly wound on a carrier. The carrier can be a spool or a shaft. The thread is treated locally or in its entirety with an adhesive. The saw wire may be a wire suitable for use in a process with loose abrasive material (saw wire with loose abrasive material) or may have an abrasive material attached to its surface (saw wire with solid abrasive material), or may be used for spark machining (EDM).
Background
The first patents for wire saws for cutting hard and brittle materials such as silicon, quartz, germanium and the like probably originate from Hayward and were laid down in the 1950s (see GB 771622, GB 717874). Silicon blocks had a diameter of 1 and 1/8 inch (28.5 mm) at that time. A sawing process with loose abrasive material is described in which a tungsten wire is used to guide a slurry containing an abrasive powder (carborandum, i.e., silicon carbide) to the cut. The sawing was done by three-body abrasion (the workpiece, the abrasive material and the wire) and the wire that was used is called the "sawing wire with loose abrasive material". The wire is guided over four wire guides with parallel grooves, forming a flat parallel wire called the wire web. The thread is advanced in a reciprocating manner, with part of the thread always being removed at the web exit, while new thread is added at the web entry. This machine has all the characteristics of what is today called a multi-wire sawing machine, which is actually an erroneous name because there is only one wire that is guided in different loops. Motorola Inc. seems to have been the first to apply the technology on a large scale for cutting silicon wafers for the semiconductor industry (see for example GB 1397676). Steel wires were used to guide the slurry with the abrasive material to the saw cut.
Today, the multi-wire sawing technology has matured and the previous technology of cutting silicon blocks by means of circular center-hole saw blades has completely supplanted. Such a saw blade with internal center hole was no longer cost-efficient due to the significant notch loss (around 300 µm). In addition, cutting today's advanced 300 mm diameter silicon blocks places insurmountable technological limits on this technology that has since been virtually completely specified. At present, all 300 mm wafers for semiconductor applications are cut with wire saws operating in a reciprocating manner.
Also in the solar cell manufacturing sector, wire saws have taken a leading position in the sense that almost all current crystalline solar cells have been cut from crystalline or polycrystalline silicon blocks using wire saws. Since the geometric requirements are less strict for solar cell wafers than for semiconductor wafers, solar cells are cut without reciprocating, i.e., in one-way mode. For example, cutting can be done much faster since no time is lost for reversing the direction of the wire (with deceleration and acceleration).
Not only the dimensions of the blocks have changed, but also the diameter and the length of the wire used have evolved. Where initially 180 micron steel saw wire was used (which led to a notch loss of around 200 µm) it became thinner to 175, 160, 150, 140, 120 and even 100 µm. Wires are made thin to 80 µm with a corresponding notch loss of about 90 µm. Since the stress used in the sawing process was not reduced, the tensile strength of the wire had to increase to keep the wire sufficiently strong.
Whereas the tensile strength was initially around 3400 N / mm2 for wire of 180 μιη, the tensile strength of the current wire of 120 µm is more than 4000 N / mm2. The length of a single sawing wire increased from 30 km earlier to nearly 900 km today. Such a length must be supplied without any weld or error.
Recently, an alternative sawing technology emerged that wants to eliminate the awkward preparation of the slurry and its control, manipulation and removal. Attaching the abrasive material to the wire eliminates the need for a slurry. Only one coolant is needed to remove the chips from the cut and to clean the wire. In addition, the efficiency of sawing is higher because abrasive particles no longer move between the wire and the workpiece but carve the material directly from the workpiece. This wire is called a sawing wire with solid abrasive material.
Another saw wire technology used for sawing electrically conductive materials is "Wire Electro Discharge Machining," "Wire EDM." In this sawing technology, sawing proceeds by drawing electrical discharges in a dielectric medium (an oil, for example) between the workpiece and a conductive wire that is constantly being renewed and defines the course of the cut. Such a technology takes its first steps for sawing semiconductor materials such as silicon (see, for example, WO 2006/027946 A1).
In the following, "saw wire" is to be understood as referring to both a wire with solid abrasive material, a wire with loose abrasive material, and a wire that can be used for spark machining.
From the foregoing it appears that in the sawing process, both with a loose and a solid abrasive material or with spark machining, the wire plays a central role. After all, the sawing stops immediately when the wire breaks. Wire breaks should be avoided by all means because they not only give rise to a loss of material (in many cases the workpiece is lost due to a loss of quality) but also to a loss of production time because it can take hours to clean and re-tension the web (which can count to more than a thousand loops for sawing solar cells).
One cause of wire breaks in the sawing process is the winding of the wire. The sawing wire is used in long lengths and is therefore rinsed on rolls or coils. Alternatively, it may be spooled on an axis that may or may not be removed from the spool. In each of these cases, a coil of saw wire will form on the roll or shaft. In the following, reference is made consistently to "coil saw wire" in which abstraction is made of the coil carrier. After all, it is irrelevant for the invention whether or not the wire is on a certain type of support.
For the sake of reference, it is assumed that the axis of winding is horizontal, that the wire runs in the direction of the observer when winding, and that the wire arrives at the coil above the axis, i.e., the coil rotates to the observer when it is released from its axis. This frame of reference is by no means restrictive since the winding of the wire may just as well be performed on a vertically placed winder, or on a winder where the coil is stationary while the wire is wound on the coil by a rotating flywheel coaxially arranged with the coil and which moves downwards axially.
When the coil is wound, the windings are organized in layers when the wire is guided from the left side of the coil to the right side and back. For the purpose of this application, a "layer" is defined as the series of turns that is formed when the wire moves from one side of the coil to the other side. Another layer is formed when the wire travels back from the other side to the first side. In view of this invention, we assume that the odd layers are the layers where the wire runs from left to right when winding while the even layers are the layers where the wire runs from right to left when winding.
A "turn" within a layer takes the form of a helix with a radius, a pitch length and a pitch direction (right-hand screw, "Z" direction for even layers with pitch Pevenf left-hand screw, "S" direction for odd layers with pitch Poneven) · The radius equals half the diameter of the coil that has already been formed and increases when winding when successive layers are applied to each other. The pitch length is the axial displacement that a thread exhibits with exactly one complete rotation around the axis of the coil. The ratio of the pitch to the circumference of the coil is equal to the tangent of the angle of the winding. Consequently, when wounding at a constant pitch, the angle of winding will decrease with an increasing diameter of the coil.
It will be clear from the foregoing that the windings of odd and even layers will always cross one another in the course of the wind and that the number of crossings across the width "W" of the coil is "C":
The "Wire Coil Density, WCD" density is defined as the ratio of the volume occupied by the wire divided by the total volume of the coil, and can be expressed as a percentage. A higher WCD offers the possibility to get more length of wire in the same coil volume.
There are various alternatives for the selection of the pitch when the wires are wound.
The use of a pitch equal to the diameter "D" of the wire is a necessary requirement to realize a "perfect turn". In that case, each layer is closed, and even and odd layers are superimposed. The density of the wire spool is maximum as the wires assume a hexagonal gasket (except where they intersect). A perfect winding is difficult to achieve at high winding speeds but allows extremely high winding speeds as required for guiding missiles by means of optical fibers (see, for example, US 4,950,049, US 5,064,490).
Using a pitch equal to a multiple of "D" leads to adjacent layers without gap. This winding is also difficult to achieve at high wind speeds and with a large number of layers.
By using a large pitch, the number of crossings across the width of the coil can be reduced, but the total length per layer will decrease. This leads to a smaller than desired density of the coil.
Within the saw wire industry, the following types of winds can be identified.
The pitch of the wire winding can be imposed by the wire saw unwinding station. Some wire saws are equipped with a removal disk that moves at a constant crossing speed. If the pitch of the spool saw wire does not closely follow this pitch of unwinding, the wire will be unwound at an unacceptably large angle with respect to the axial perpendicular plane of the wire.
For a wire with solid abrasive material, a pitch of between D and 2D was proposed in US 2007/0023027. At present, spools for saws with loose abrasive material are flushed with a pitch of more than 2D but less than 200D. That appears to be a good compromise between a sufficiently high WCD and rinsing quality.
The following problems may arise during the use of a sawing wire.
If the wire is used in a back-and-forth process, the problem of self-damage of the saw wire arises. Since used wire is repeatedly flushed back under high pressure on the coil, abrasive particles on turns that move relative to each other can seriously damage the wire. In the case of cutting with loose abrasive material, the abrasive particles get stuck in the slurry on the surface of the wire when they are wound back on the new wire. In the case of a wire with solid abrasive material, the problem is even more pronounced since the abrasive particles are present on both the backwashed wire and on the new wire. Such damage can lead to an early wire break.
Furthermore, there is the "clamped wire" problem. As mentioned above, the saw wires have evolved from rather thick (180 µm) to literally fine (80 µm). Since the rigidity of a wire is proportional to the fourth power of the diameter, the fine saw wire is not resistant to bending. Since the tensile strength has also increased over the years, a saw wire is very difficult to plastically deform. Both trends have led to a "springy" type of wire that deflects quickly even under its own weight, but which is difficult to give a permanent curvature. In the production of the wire, the windings are successively flushed first to each other and then to each other. When the thread leaves the spool at the same angle as it was wound during spooling, there is no problem of spooling. If, due to a malfunction of the windings, one or more windings laid later end up between the coil and windings of the same or a different layer that were laid earlier, the wire can become jammed during rinsing.
To present this problem in a more understandable way, reference is made to Figure 2. Part I of Figure 2 shows a single layer 212 on the outside of the coil 210. The layer 212 contains different turns "a", "b", " c "," d "and" e "that were wound on the spool in that order. The visible half of the turn is indicated by a solid line, while the invisible half is indicated by a dashed line. Because of a malfunction, loop 216 of winding "e" has become pinched between the previously laid winding "d" and coil 210. After rinsing, by pulling the thread away in direction 214, the turns "e" and "d "up and" d "pinches the loop 216 of winding" e "against the coil 210. During the rinsing, a short strong force (a" snip ") occurs which can lead to the breaking of the wire.
The problem is exacerbated if the operator takes the loop 216 as the end of the wire and the free end pulls out of winding "e". The unwinding will take place over the full width of the coil until the end of the coil is reached.
In part II of figure 2 windings "f" were caught under two previously laid windings "e" and "d". The interpretation of the figure remains the same.
"Clamped wire" occurs when a first laid turn is crossed by a later laid turn. These intersections are indicated by the broken circles 218 in Figure 2.
It will be clear from the foregoing that if the order of the coil does not change and the thread is wound correctly, no problems can arise. However, the following failures occur frequently:
As the coil is taken off, the order of the windings can be changed due to the end of the wire being fastened (usually by tying), by falling windings when changing the orientation of the coil (e.g. to place it vertically), or by wrapping paper.
The windings can be disturbed during manipulation and transport of the coil (vibrations).
Since in many sawing machines the axes of the coils are vertically oriented, there is a real risk of falling windings, and thus clamped wires, when mounting the coil.
If, upon unwinding, the thread is pulled from the spool at a large "unwinding angle" with respect to the axial perpendicular plane, there is a risk that upper turns move and are pulled sideways over the underlying turns, the order of the lower turns turns is disturbed. This risk is particularly present with sawing machines that use primitive winding systems in the return cycle of the back and forth movement that do not take into account the position of the last unwound new wire.
At any time that the tension at the end of the sawing wire is lost, there is a risk of disruption of the windings. The end of the wire must therefore remain tensioned at all times.
It must be clear from the foregoing that much can go wrong, most of these factors not being able to be checked by the saw wire producer. Various solutions were sought, for example, to attach the coil in a shrink package, to tap the outer turns to clearly indicate the end of the coil by means of a clearly visible end sign. None of these solutions, however, appears satisfactory. After all, a shrink package causes a major disruption of the outer turns when unpacking, and when removing a tape the turns come loose. A clearly visible end sign only helps when the operator of the sawing machine can keep the wire tensioned when wiring the machine, which requires great skill and skill.
The inventors therefore set themselves the task of finding a complete solution to the problems of crushing and self-harm.
Disclosure of the invention
The main object of the invention is therefore the elimination of the problems of pinching and self-damage for any type of saw wire. More specifically, the inventors wanted to eliminate these problems for wire with solid abrasive material, wire with loose abrasive material, and wire for spark machining (EDM). The inventors solved the problems on two levels: at the level of the coil of the saw wire and at the level of the saw wire itself. A method is provided to prevent pinching of wires.
According to a first aspect of the invention, a coil of saw wire is defined with saw wire that is wound in layers and where each of said layers consists of a plurality of turns. It is clear from the previous section what is meant by a "coil saw wire" (paragraph [0009]), what is meant by a "layer" (paragraph [0011]), and what is meant by a "winding" (paragraph [ 0012]).
The saw wire within the context of this application (on top of what has already been mentioned in paragraph [0007]) is a metal wire. The saw wire preferably comprises a steel core and one or more coating layers, possibly with the abrasive material incorporated or without abrasive material. The steel core is made of unalloyed steel (with a minimum carbon content of 0.70 weight percent carbon) or a stainless steel. The coatings can be of brass (the preferred variant for wire with loose abrasive material), zinc (in the case of EDM wire), or copper with a coating of nickel on top (in the case of wire with a solid abrasive material; the eroding material particles are included in the copper coating).
Moreover, the preferred diameters and the tensile strength of the saw wire are: for a diameter smaller than ... the tensile strength is greater than ...
250 µm 2900 N / mm2 150 µm 3600 N / mm2 140 µm 3700 N / mm2 120 µm 3900 N / mm2
A characteristic of the coil sawing wire is that there is an adhesive on at least one zone of the outer layers of the coil (see Figure 3 for clarification).
The "outer layers" means the layers that are last wound on the spool (and therefore the layers that must be unwound first). Each layer with windings visible from the outside is considered an "outer layer" (indicated by 302 in Figure 3).
By "zone" is meant a part of the surface of the coil or the entire surface. The zone can be divided into non-adjacent subzones, and the zone can be convex or concave. All this does not limit the invention.
By "adhesive" is meant a substance which is capable of holding the windings of saw wire attached. Synonyms for adhesive are "glue" or "gum" or "sticky substance" or "sticky substance". However, adhesive does not mean tape with an adhesive substance on it (such as Sellotape, Scotch and the like), because it has been found that it does not solve the problem.
This zone 306 preferably comprises at least the place where the sawing wire 304 ends (see figure 3a).
It is the function of the adhesive to sufficiently hold the turns of the wire so that they do not move easily. This "holding force" can be determined by peeling the thread in a direction perpendicular to the outer surface of the coil. The holding force of the adhesive is determined by the specific force of the adhesive and the contact surface between the adhesive and the thread: the higher the contact surface, the stronger the holding force will be. The holding force must at least be able to overcome gravity on at least one turn to prevent windings from falling during transport and during handling. This is 200 to 300 μΝ. Preferably, the adhesive zone must be able to hold a few turns, to increase the certainty that no turns will fall. Consequently, it is preferable that the holding force is greater than 1 mM.
The holding force must not be stronger than the force with which the thread is pulled from the spool. In general, this force is less than 25 N. Preferably, the force is less than 5 N, which is approximately the peak force that occurs with a clamped wire. This holding force is preferably less than 1 N in order to prevent the force peaks occurring during the unwinding zone at the adhesive zone. In general, the adhesive will be a relatively weak adhesive that holds the wires by purely mechanical anchoring (hardening around saw wire keeping the wire in place) or by weak chemical interaction (vanderwaals forces, polar interactions but no covalent bonding) or both . Tests have shown that a holding force of between 20 and 260 millinewton is sufficient to hold the wire in place and also not to disturb the winding of the wire.
Furthermore, it is preferable that at least a number of turns are held in place by the adhesive. All turns of the outer layers 302 can be attached by means of the adhesive if the zone 308 extends from one side of the coil to the other end on the outer layers of the coil (see Figure 3b). Thus, each turn of the outer layers will be held in place for at least a portion of the turn. In this way, the tension at the end of the saw wire can never be lost during the assembly and tensioning of the saw wire: the wire is always held and no windings can fall.
Alternatively, the adhesive may be present in a circular ring zone encircling the axis of the coil (see Figure 3c). The ring must be wide enough so that at least enough turns are present to wire the sawing machine, since once the unwinding continues outside the ring, the turns are no longer retained.
A combination of the two is also possible when the zone takes the form of a screw ring extending from one end of the coil to the other end while circling the axis of the coil (embodiment not in the drawing).
The adhesive may also be present on the entire surface 312 of the outer layers, which in any case offers the possibility of retaining a sufficient number of turns while the sawing machine is tensioned (see Figure 3d).
The adhesive can also be present throughout the coil, i.e. all layers are covered with adhesive (embodiment not in the drawing). This is particularly preferred when the machine is operating in a back and forth mode since then the new wire spool, which is still covered with adhesive, acts as a cushion for re-wound used wire that is covered with abrasive material. This embodiment is particularly preferred for wire with a solid abrasive material.
Saw wire is generally wound with a pitch of between 2 and 200 times the diameter of the wire D. More preferably, the pitch is between 4 and 20 times the diameter of the wire D. It is generally not desirable nor possible to wind saw wires "with a perfect winding" as it happens by way of example in the case of fiber optic wire (US 4950049, US 5064490). As described (paragraph [0018]), saw wires behave "resiliently" because of their very low bending stiffness and high tensile strength and do not lend themselves to a perfect winding at the winding speeds that are common for saw wire wrappers.
It is also preferred that the coils (POneven and Peven) are not a whole multiple of the wire diameter D. If the coils are a whole multiple m of D, the layers will generally be closed (except at the places where a crossing occurs). By "closed" it is meant that windings of m different layers are adjacent to each other with the same radius. The (m + 1) th layer then starts on top of these m layers. If the pitches are not a multiple of D, a gap will occur between the wires, whereby an "open" net is formed so that adhesive can penetrate to an even lower layer, thereby improving the fastening of the windings. That is why a winding with open layers is preferred.
According to a second aspect of the present invention, a saw wire itself is described which includes the saw wire spool according to the first aspect of the invention.
The sawing wire is characterized in that it contains an adhesive on at least a portion of its surface. It has previously been clarified what is meant by a "saw wire" (paragraph [0024]) and a "adhesive" (paragraph [0025]) in the context of this patent application. By "on at least a portion of its surface" is meant that some adhesive can be found somewhere along the length of the saw wire that sticks to the wire.
Preferably, the adhesive is soluble in a polar medium. Examples of polar media are: water, which is commonly used as a coolant in the case of sawing with a wire with a solid abrasive material.
Polyethylene glycol (PEG) or specific compounds diethylene glycol (DEG), triethylene glycol (TEG), tetraethylene glycol. If the number of ethylene glycol monomers is greater than four, the term PEG is generally used. PEG, and to a lesser extent DEG, is used in particular as a support of abrasive material in the case of sawing with loose abrasive material.
Alcohol in all its variations, e.g. methanol, ethanol, n-propyl alcohol, iso-propyl alcohol.
Mixtures of the aforementioned polar media can also be used and will in some cases be developed during use. Example: PEG is known to be hygroscopic and absorb water in use.
One consideration is that when an adhesive is used on the saw wire, in the case of sawing with loose abrasive material, this adhesive will interact with the slurry. The adhesive on the wire will indeed be rubbed off in the first loops of the web and carried away through the slurry. In order to avoid clogging of tubes or accumulations of abrasive material on residual adhesive, it is preferable that the adhesive dissolves in the slurry.
In the case of sawing with solid abrasive material, the coolant must be able to be easily washed away with the adhesive so that the abrasive particles in the coating can easily interact with the workpiece.
It is therefore a preferred embodiment to use adhesives that are soluble in at least one of the aforementioned polar media. Possible preferred adhesives are therefore selected from the group consisting of polyvinylpyrrolidone (the "sticky" component in hairspray); polyvinyl acetate, methyl cellulose, polyvynil alcohol, or ethylene vinyl alcohol copolymers, polyethyloxazolines, or mixtures thereof.
As another possibility, other types of adhesives may be used that are not necessarily soluble in polar media. In that case the remnants of the adhesive in the sawing process will be removed anyway by abrasion. In this embodiment, the particles are carried away by the slurry or the coolant. It is therefore preferred that if such adhesives are used, the amount of adhesive entering the coolant or slurry is reduced to a minimum by, for example, minimizing the area to which the adhesive is applied.
Alternatively, if the adhesive does not chemically interact with the wire and it merely anchors the wire mechanically, mechanical cleaning may be provided before entering the saw web. This can be done, for example, by bending the wire or passing it through a brush.
Adhesives that are not necessarily soluble in polar media can be selected from the group consisting of thermoplastic adhesives, hot melt adhesives, and thermosetting adhesives such as epoxy resins.
Alternatively, a bioadhesive can be selected from the group consisting of casein-based, starch-derived, hydrogels, polysaccharin or protein-based adhesives.
When the adhesive comes into contact with the saw wire, it must not cause corrosion of the saw wire. To prevent this corrosion, a corrosion inhibitor can be added to the adhesive. Examples of corrosion inhibitors are phosphates, silicates, silanes, carbonates or carboxylic acids, sulfides or mercapto derivatives, amines or sulfonates or combinations thereof.
The presence of an adhesive can be easily checked by checking the holding force of the thread end. As another possibility, the thread exhibits a certain tack that can be felt by hand. The type of adhesive can be deduced by infrared spectroscopy that can be performed directly on the wire.
In order to determine a favorable effect, a minimum amount of adhesive must be present on the sawing wire. The amount of adhesive can best be determined by determining the organic carbon content on the surface of the wire by means of carbon pyrolysis. Only a limited sample (1 to 2 grams) is required for this test. The sample is heated to 480 ° C until the organic residues (but not the carbon in the steel) on the sample decompose into carbon monoxide and carbon dioxide. All carbon monoxide is converted to carbon dioxide in a catalyst at 850 ° C. The total amount of carbon is calculated from the infrared absorption of the carbon dioxide. The total remaining amount of carbon must be at least greater than 400 pg of carbon residue per gram of wire. It may not exceed 3000 pg of carbon residue per gram of saw wire. Since the adhesive does not only consist of carbon (but also of hydrogen and oxygen), the numbers are smaller than those determined by other methods such as the double weighing method. It must also be checked whether the carbon residue is indeed from the adhesive (and not from another organic composition), which can be easily carried out by infrared spectroscopy.
According to a third aspect of the invention, a method is provided to prevent the clamping of saw wires when unwinding on a wire saw. The method comprises the step of winding a coil of saw wire. In a preferred embodiment, the thread is provided with an adhesive during rinsing. In a second preferred embodiment, the outer surface of the coil saw wire is provided with an adhesive after the coil has been fully wound. The adhesive is applied to at least one zone of the outer surface of the coil saw wire.
Brief description of the figures in the drawings
Figure 1 shows the frame of reference of how windings and layers can be located on a coil.
Figure 2 illustrates in detail how clamped wires occur.
Figure 3 shows four different embodiments "a", "b", "c" and "d" on how the invention can be implemented.
Methods for carrying out the invention
In a first attempt to solve the problem of clamping the wire, the inventors departed from the idea that by oiling the wire, the clamping could be suppressed by the fact that the sawing wire was easier over another piece of wire would slide to find a better balance. Amazingly, however, the clamping of the wire was more frequent. That is why they did the opposite, in particular making the thread sticky by means of an adhesive. This is different than you would expect: you would not think that you could better unwind a sawing wire by gluing it.
A series of tests were organized with a water-based emulsion of polyvinyl acetate (50/50 weight ratio), hereinafter referred to as "glue", in different degrees of aqueous solution.
In a first test, a length 1 of about 8 km 140 µm of brass-coated sawing wire was wound on a coil with a coil diameter of 156 mm at a tension of about 3 N and a pitch of 1.5 mm. During the winding, a water solution of 1 in 4 parts by volume was constantly applied to the wire. After drying, about 2 km was removed at a speed of 500 m / min and a unwinding tension of 9 N. The unwinding tension was checked with a tension meter. The unwinding took place at a strict unwinding angle of about 45 ° to 85 ° with respect to the plane perpendicular to the axis of the coil. Only small clamping forces (<0.1 N) were found that could be attributed to the excessive holding power of the adhesive. Visually no shifted windings were detected.
A reference coil of length R was prepared under identical conditions as the first coil but without the administration of any adhesive. The coil was also unwound under identical conditions as the first coil. Clearly shifted windings could be observed visually and severe clamping was observed throughout the coil.
In a second series of experiments, different degrees of dissolution of the glue in water (volume ratios) were tested. On 3 spools filled with 5 km 120 µm saw wire under a tension of 3 N with a pitch of 1.5 mm (12.5 x D), a peripheral ring 30 mm in width was coated with an adhesive 10 mm from the end of the coil and on the other hand followed by a "control zone" uncoated of 30 mm. A solution with a dilution of 1:20 (length 2) on the first coil, a dilution of 1:10 (length 3) on the second coil and a dilution of 1: 5 (length 4) on the third coil peripheral ring applied by means of a paint brush.
Again, the coils were unwound at the same strike unwinding angle at a unwinding voltage of about 14 N and a speed of 600 m / min. The following results were obtained (Table 1):
The numbers in parentheses refer to the standard deviation. The numerical results are an average of at least four individual values. "Carbon residue" was determined by the pyrolysis method. Note that the "control zone" shows some carbon residue due to the carbon residues on the uncoated steel. The unwinding assessment confirms that a minimum amount of glue is necessary to prevent jamming. It can be concluded that a solution of at least 1 in 10 volumes of glue in water is sufficient to achieve the desired holding power, while a solution of 1 in 4 volumes of glue in water causes too much holding power.
The adhesive solution can be applied in a number of ways, for example by spraying, dipping, ironing or immersion. The glue solution can be applied continuously during winding (for example, by passing the saw wire through a dipping tank or a glue for applying glue), intermittently (for example after a number of layers were wound up, an automatic spray gun applies some glue to the already formed coil, without interrupting the winding process), or after winding (for example, when the coil saw wire is removed, the outer surface is covered with a ring of glue, preferably before the tension is removed).

权利要求:
Claims (16)
[1]
A saw wire coil containing saw wire wound in layers, each of said layers consisting of a plurality of turns characterized in that an adhesive is present on at least one zone of the surface of the outer layers of said coil.
[2]
The coil saw wire according to claim 1, wherein said coil saw wire further has an axis and a first and a second end, and wherein said zone extends between said first and second end and / or said zone circles.
[3]
The coil sawing wire according to claim 2, wherein an adhesive is present on at least the surface of said outer layers.
[4]
The coil sawing wire according to claim 3, wherein an adhesive is present between said layers.
[5]
The coil saw wire according to any of claims 1 to 4, wherein said windings in said layers exhibit a pitch greater than twice the diameter of said saw wire.
[6]
The coil saw wire according to any of claims 1 to 5, wherein said adhesive retains said saw wire with a force of at least 1 millinewton when peeled perpendicular to the outer surface of said coil.
[7]
A saw wire, characterized in that said saw wire contains an adhesive on at least a portion of the surface of said saw wire.
[8]
The sawing wire of claim 7, wherein said adhesive is soluble in a polar medium.
[9]
The sawing wire of claim 8, wherein said polar medium is selected from the group consisting of water, polyethylene glycol, alcohol, diethylene glycol, or mixtures thereof.
[10]
The sawing wire of claim 8 or claim 9 wherein said adhesive contains one of the group consisting of polyvinylpyrrolidone, polyvinyl acetate, methyl cellulose, polyvynil alcohol, or ethylene vinyl alcohol copolymers, polyethyloxazolines, or mixtures thereof.
[11]
The sawing wire of claim 7, wherein said adhesive is selected from the group consisting of thermoplastic adhesives, hot melt adhesives, and thermosetting adhesives.
[12]
The sawing wire of claim 7, wherein said adhesive is a bio-adhesive selected from the group consisting of casein-based, starch-derived, hydrogels, polysaccharin or protein-based adhesives.
[13]
The sawing wire according to any of claims 7 to 12, wherein said adhesive further comprises a corrosion inhibitor.
[14]
The saw wire according to claim 13, wherein said corrosion inhibitor is one from the group consisting of phosphates, silicates, silanes, carbonates or carboxylic acids, sulfides or mercapto derivatives, amines or sulfonates or combinations thereof.
[15]
The sawing wire according to any of claims 7 to 14, wherein said adhesive is present with an amount of carbon residue of at least 400 µg per gram of sawing wire.
[16]
A method of avoiding clamping during unwinding of a coil of saw wire wherein during or after winding said coil said saw wire is provided with an adhesive on at least one zone of the outer surface of the coil.

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同族专利:

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CN103180236A|2013-06-26|

WO2011138192A2|2011-11-10|

WO2011138192A3|2015-07-02|

CN202241640U|2012-05-30|

EP2566801A2|2013-03-13|

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法律状态:
2013-11-30| RE| Patent lapsed|Effective date: 20130531 |

优先权:

申请号 | 申请日 | 专利标题

EP10161854|2010-05-04|

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