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  • 专利说明
  • 权利要求
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    • 专利摘要:
    CONVEYOR BELT. The present invention discloses a method of fabricating fabric reinforcement having improved peel adhesion characteristics which is of particular value in reinforcing endless belts, where at least two layers of fabric material are embedded in the fabric reinforcement, said process comprising (1) impregnating a fabric material with a binding agent in a plastisol to form a coated fabric material, (2) applying a layer of plastisol between two or more layers of coated fabric, thereby creating a belt housing, ( 3) continuously feed the belt housing to a double belt press, which compresses the impregnated fabric materials together with the plastisol layer (s), at a pressure of at least 34,500 Pa (5 psi), to produce a preformed tissue housing, at the same time (4) heat the preformed tissue housing to a temperature that is within the range of 182 ° C (360 ° F) to 232 ° C (450 ° F), for a period of at least 6 minutes , and (5) continuously remove the fabric housing from the press.
    公开号:BR102014004579B1
    申请号:R102014004579-1
    申请日:2014-02-26
    公开日:2021-01-05
    发明作者:Gregory D. Pero；Robert H. Vogliano；Barry M. Wilson；David J. Maguire
    申请人:Contitech Usa, Inc.；
    IPC主号:
    专利说明:

    Field of the Invention
    [0001] The invention relates to conveyor belts which are manufactured with a thermoplastic polymer and which include a fabric housing, as well as the new method of making such belts. Background of the Invention
    [0002] Conventional conveyor belts that are used in heavy-duty applications are typically comprised of a cured rubber as a top layer, a cured rubber as a bottom layer, and a fabric reinforcement layer (a carcass), the which is sandwiched between the top layer and the bottom layer. Rubber conveyor belts of this type can offer excellent performance characteristics and a relatively long service life. However, rubber conveyor belts are highly dependent on labor to manufacture and require a curing step, where the rubber components of the belt are cured (vulcanized) to their final shape to produce the belt as a finished product. .
    [0003] It is known in the art to use poly (vinyl chloride) plastisols in the adhesion of the various components of the reinforcement fabric housing used in the conveyor belts. For example, United States Patent 4,813,533 discloses a flat webbing that includes a plurality of individual layers of fabric that spans the entire length and width of the webbing. The layers are joined together by reinforcement elements that extend substantially in the direction of the thickness of the belt. The individual layers and reinforcement elements are encapsulated in a matrix of polymeric elastomeric resin, for example, poly (vinyl chloride). The individual layers are saturated with a liquid elastomer-forming polymeric resin before being joined together. The reinforcement elements can be inserted, for example, by padding, sewing, or stitching. One or more of the individual fabric layers may be a fabric or other cloth having a plurality of substantially parallel threads that extend in the direction of the length of the strap. One or more of the individual fabric layers can be a nonwoven fabric. In cases where the liquid saturated is a poly (vinyl chloride) plastisol, the resin is gelled by the application of heat. The term "gelate", as used in United States Patent 4,814,533, means that poly (vinyl chloride) plastisol becomes solid and will not flow thereafter at room temperature, but its physical properties are not still fully developed. In any case, this reference indicates that the gelation of poly (vinyl chloride) plastisol can be carried out by heating the liquid plastisol to a temperature of at least 93 ° C (200 ° F) to 104 ° C (220 ° F) .
    [0004] United States Patent 4,928,812 discloses a conveyor belt, which has high rigidity, tear resistance and flame retardancy, and which is particularly suitable for use in coal mines. It comprises a matrix of resinous material of thermoplastic elastomer, eg PVC, reinforced with a shell comprising a layer of primary traction elements that extend substantially and straight in the longitudinal direction of the belt and consisting of continuous filaments, and layers of cover consisting of wires or lines arranged on both sides of the primary traction elements, so as to confer adhesion in the transverse direction of the belt, the top and bottom cover layers being joined by connecting wires or lines. The primary traction elements are composed of aramid cables or strands. The adjacent primary traction elements are separated by openings having a width of 0.5 to 3 times, more particularly 2 times the outside diameter of the primary traction elements. The openings are filled with one or more elements, such as, for example, cotton cables or cords. United States Patent 4,928,812 more specifically discloses a conveyor belt comprising: (I) a poly (vinyl chloride) based matrix; and (II) a reinforcement construction embedded in said matrix, said reinforcement construction comprising a composite fabric which includes: (a) a first layer including (i) a plurality of primary support warp elements, each formed by a plurality of substantially parallel cables or strands of continuous aramid filaments and extending straight in a longitudinal direction of the belt, each of said primary support elements being spaced apart from the other to form spaces between them having a width that is 0.5-2 , 0 times said outer diameter D of said primary support element and (ii) a plurality of a second cotton other than aramid comprising padding elements respectively arranged rectilinearly in said spaces between said primary support elements; (b) a second layer provided on an upper side of said first layer and a third layer provided on a lower side of said first layer, said second and third layers, each comprising cotton threads adhered to said poly ( vinyl chloride); and (c) a plurality of binding warp threads or filaments that interconnect said first layer, said second layer and said third layer.
    [0005] There remains a long-felt need for a technique to manufacture conveyor belts that are free of rubber-like polymers that require a curing cycle and that provide excellent performance characteristics and a good service life. However, the inadequate adhesion of the layers of materials has been a problem that has remained in the way of such progress in the state of the art. Summary of the Invention
    [0006] The present invention provides a method for making conveyor belts that are free of rubber-like polymers that need to be cured and thereby eliminates the need for curing the belts in a curing step. This technique is carried out in a continuous process that reduces labor requirements. It offers a greatly simplified alternative to extrusion coating techniques and, most importantly, provides belts that offer improved adhesion to the material layers of the housing, which can be used in heavy-duty applications. By eliminating cured rubbers from the process, recycling is a viable option as it allows finishing scraps and other scrap materials to be recycled. Consequently, by practicing the process of this invention, improved belts can be prepared by a simpler process that requires less labor in a shorter processing time. In many cases, the manufacturing cost is also reduced by reduced energy requirements and lower-cost raw materials.
    [0007] The present invention more specifically discloses a method of manufacturing a fabric housing that is of particular value in reinforcing endless belts, where at least two layers of fabric material are embedded in the fabric reinforcement and where the fabric reinforcement exhibits improved shell adhesion characteristics, said process comprising (1) impregnating a fabric material with a bonding agent in a plastisol to form a coated fabric material, (2) applying a layer of plastisol between two or more layers of coated fabric, thereby creating a belt housing, (3) continuously feeding the belt housing to a double belt press, which compresses the impregnated fabric materials together with the plastisol layer (s), into one pressure of at least 34,500 Pa (5 psi), to produce a preformed tissue housing, at the same time (4) heat the preformed tissue housing to a temperature that is within the range of about 1 82 ° C (360 ° F) to about 232 ° C (450 ° F), for a period of at least 6 minutes, and (5) continuously remove the fabric housing from the double belt press.
    [0008] The present invention also discloses a method of making a belt, which comprises: (1) impregnating a fabric material with a binding agent in a plastisol, to form a coated fabric material, (2) applying a layer of plastisol between two or more layers of coated fabric, thereby creating a belt housing, (3) continuously feeding the belt housing to a double belt press, which compresses the impregnated fabric materials together with the layer (s) (s) of plastisol, at a pressure of at least 34,500 Pa (5 psi), to produce a preformed tissue substrate, while (4) heating the preformed tissue substrate to a temperature that is within the range from about 182 ° C (360 ° F) to about 232 ° C (450 ° F), for a period of at least 6 minutes, (5) continuously remove the fabric housing from the double belt press, (6 ) spread a thermoplastic elastomer resin composition over the top and bottom surfaces of the fabric housing, (7) compress the thermoplastic elastomer resin composition onto the upper and lower surfaces of the fabric housing by continuously feeding the fabric reinforcement to a second double belt press, which is maintained at a hair temperature minus 171 ° C (340 ° F) and at a pressure of at least 34,500 Pa (5 psi), and (8) continuously remove the finished belt from the second double belt press. Brief Description of the Drawing
    [0009] FIG-1 is a cross-sectional view of a conveyor belt, which can be prepared by the method of this invention. Detailed Description of the Invention
    [00010] In the first stage of the process of this invention, the fabric is continuously impregnated with a plastisol binding agent, to form a coated fabric material. The fabric used will typically be comprised of cotton, a polyester, a nylon, or a mixture of them. For example, polyester can be poly (ethylene terephthalate) or poly (ethylene naphthalate). In some cases, the polyester may be a copolyester, which contains repeating units that are derived from either terephthalic acid or isophthalic acid or its dimethyl esters. In such cases, the copolyester will typically contain at least about 95 weight percent terephthalic acid and up to about 5 weight percent isophthalic acid. More typically, the copolyester will contain at least about 97 weight percent terephthalic acid and up to about 3 weight percent isophthalic acid. The polyester fabric can optionally be prepared from polyester staple fiber yarn to improve adhesion characteristics. The nylon fabrics that can be used in conjunction with this invention can be comprised of virtually any type of nylon, such as nylon-6.6, nylon-6.12, nylon-6.10, nylon-6.9, nylon -6, nylon-11, or nylon-12. For commercial reasons, the nylon will typically be nylon-6,6 or nylon-6. In any case, the fabric material will normally be a braided fabric.
    [00011] The surfaces of the impregnated fabric are the surfaces that will come into contact with (a) layer (s) of a separate plastisol (without bonding agent), which will also be in contact with other layers of the fabric that constitute the fabric housing that will ultimately be used as a conveyor belt housing. In any case, the fabric is impregnated with a plastisol binding agent in this step to produce an impregnated fabric material. It is preferred for this impregnation step that it is carried out in a continuous process, such as passing the fabric through an impregnation zone, such as an immersion bath or a coating wheel under low tension, preferably less than 1.071 kg per cm wide (6 pounds per inch wide), more preferably in the range of 0.179 to 0.893 kg per cm wide (1 to 5 pounds per inch wide). The weight ratio of the binding agent to plastisol will typically be within the range of 2:98 to 10:90 and more typically will be within the range of 4:96 to 8:92. The weight ratio of the binding agent to plastisol will most typically be within the range of 5:95 to 7:93.
    [00012] The plastisols used in the practice of this invention are dispersions of poly (vinyl chloride) homopolymer and / or vinyl chloride vinyl acetate copolymers in conventional poly (vinyl chloride) plasticizers. The relative amounts of poly (vinyl chloride) and plasticizer will be adjusted to obtain a paste of the desired consistency for use in the coating application. The bonding agent employed typically contains isocyanate groups that can improve the adhesion characteristics between the fabric and the PVC. As explained in United States Patent 7,776,768, preference is given to the use, as adhesion promoters, of isocyanurates that contain isocyanate groups and that can be prepared by oligomerization, in particular, trimerization, from diisocyanates. The most suitable diisocyanates for this purpose are mixtures, which are readily available commercially, of isomeric diisocyanatotoluenes (TDI), composed mainly of 2,4-diisocyanatotoluene (2,4-TDI) and 2,6diisocyanatotoluene (2,6-TDI) . These can easily be reacted almost completely to give isocyanurates that contain isocyanate groups. The almost complete reaction is necessary because operator safety and product safety require that the residual content of diisocyanates in the preparation of the adhesion promoter remain below 1.0% by weight. Diisocyanatodiphenylmethanes (MDI) are also readily available, but are less suitable, and are more difficult to trimerize than TDI and can therefore result in an undesirably high residual content of diisocinates. Isocyanurates containing MDI-based isocyanate groups, in addition, exhibit unsatisfactory solubility and have a tendency to crystallize.
    [00013] Isocyanurates containing isocyanate groups are particularly easy to handle as adhesion promoters when they are used in the form of a solution in a plasticizer. In a practical method, isocyanurates that contain isocyanate groups and are derived from TDI are also prepared in the plasticizer used as the solvent. DE 24 19 016 A1 (GB 145 570 1A) describes, by way of example, these adhesion promoters and the preparations of the adhesion promoters comprising plasticizer, and their preparation and use.
    [00014] Plasticizers are substances that, when mixed with PVC, which is intrinsically hard and brittle, give a soft, resistant material, known as plasticized PVC. Examples of known plasticizers are esters of phthalic acid, adipic acid or benzoic acid. Plasticized PVC can comprise large quantities of these plasticizers, sometimes more than 50% by weight of plasticized PVC.
    [00015] In the second step of the process, at least one layer of plastisol without bonding agent is applied between two of the impregnated layers of fabric. This process is repeated depending on the number of layers of fabric impregnated. Plastisol can be the same or different from the plastisol used to impregnate the fabric. Once the plastisol layer is applied, it is pre-gelled by heating it to a temperature between 37.8 ° C (100 ° F) and 93.3 ° C (200 ° F), more preferably between 65.5 ° C (150 ° F) and 82.2 ° C (180 ° F). This process is completed with minimal traction on the fabric layers, preferably less than 1.071 kg per cm wide (6 pounds per inch wide), and more preferably at a pull of 0.179 to 0.893 kg per cm wide (1 to 5 pounds per inch wide). The result of this step is a pre-gelled tissue carcass.
    [00016] In the third stage of the process, the pre-gelled fabric housing is continuously fed into a double belt press, where it is compressed together, at a pressure of at least 3.5 x 104 pascals (5 psi). Belt press belts will typically have surfaces that are comprised of fiberglass impregnated with polytetrafluoroethylene (PTFE) or a thin layer of stainless steel. The belt press will typically apply a pressure of 3.5 x 104 pascals to 2.4 x 105 pascals (5 psi to 35 psi), more typically 7.0 x 104 pascals to 2.0 x 105 pascals (10 psi to 30 psi), preferably it will apply a pressure of (8.3 x 104 pascals to 1.7 x 105 pascals (12 psi to 25 psi), and more preferably it will be 1.0 x 105 pascals to 1.4 x 105 pascals (15 psi at 20 psi).
    [00017] The fabric housing will be kept in the double belt press at a temperature that is within the range of about 182 ° C (360 ° F) to about 232 ° C (450 ° F), for a period of at least least 6 minutes. The temperature will preferably be kept within the range of about 191 ° C (375 ° F) to about 218 ° C (425 ° F) and most preferably it will be kept within the range of 199 ° C (390 ° F) at 210 ° C (410 ° F). The fabric housing will typically have a residence time in the double belt press that is within the range of 8 minutes to 14 minutes and more preferably it will have a residence time in the double belt press that is within the range of 9 minutes to 12 minutes. .
    [00018] After being held in the double belt press for the desired residence time, the fabric housing is continuously removed from the press as a finished fabric housing, which is suitable for use as a conveyor belt housing. In one embodiment of this invention, such a conveyor belt is manufactured continuously with the finished fabric housing as it is being removed from the double belt press. In such a process, a thermoplastic elastomer resin composition is continuously spread over the upper and lower surfaces of the fabric housing. The thermoplastic elastomer resin is in the form of particles that typically have a size distribution of between 0.25 mm and 1 mm, with an average of 0.5 mm. The thermoplastic elastomer resin is typically plasticized PVC. However, the thermoplastic elastomer resin can also be a polyurethane resin or a polyolefin, such as polyethylene or polypropylene. The thermoplastic material is then compressed on the upper and lower surfaces of the fabric reinforcement by continuously feeding the fabric reinforcement to a second double belt press, which is maintained at a temperature of at least 171 ° C (340 ° F) . The thermoplastic material can optionally include fillers, such as calcium carbonate, coloring agents, such as carbon black or titanium dioxide, flame retardant agents, antimicrobial agents, antistatic agent and / or antifungal agents. In the case of PVC, it is often desirable to additionally include chlorinated polyethylene or a nitrile rubber.
    [00019] Conveyor belts using a fabric reinforcement, which is manufactured using the method of this invention, typically include an elastomeric body having a load carrying surface and a parallel pulley attachment surface, where the fabric reinforcement is disposed within the elastomeric body of the belt. Such a conveyor belt 10 is shown in Fig-1, where the fabric reinforcement is comprised of a first fabric layer 14, a plastisol layer 16, and a second fabric layer 18. This fabric reinforcement is located between the fabric layer pulley cover 12 and the load carrying layer 20 of the belt 10.
    [00020] This invention is illustrated by the following examples which are for the purpose of illustration only and are not to be considered as limiting the scope of the invention or the way in which it can be practiced. Unless specifically stated otherwise, parts and percentages are given by weight. Example 1
    [00021] In this experiment, a fabric housing was prepared that was suitable for the reinforcement of conveyor belts. In the first step of the procedure, a binding plastisol composition was prepared by mixing 200 grams of emulsion grade poly (vinyl chloride) (PVC) in a liquid plasticizer solution containing 86 grams of diisononyl phthalate (DINP), 6 grams of epoxidized soy oil (ESO), and 6 grams of calcium / zinc stabilizer (Mark 3079).
    [00022] Subsequently, 1.2 grams of Lanxess 2001N binding agent (containing 40 weight percent of the mixture of 2,4-toluene diisocyanate / 2,6-toluene diisocyanate (TDI) in dibutyl phthalate) was mixed in 20 grams of the binding plastisol composition, which was previously prepared. This composition was then applied uniformly to both sides of two 16.5 cm by 16.5 cm (6.5 inches by 6.5 inches) squares of a polyester fabric (35.5 points per inch 2000 denier polyester in the warp direction and 4.1 wefts per cm (10.5 wefts per inch) of 4000 denier polyester yarn in the weft direction).
    [00023] Then, a layer plastisol composition was prepared per 100 grams of emulsion grade poly (vinyl chloride) (PVC) in a solution of 68.18 grams of diisononyl phthalate (DINP), 30.77 grams calcium carbonate (4 micron particle size), 2.93 grams of epoxidized soybean oil (ESO), 1.91 grams of calcium / zinc stabilizer (Mark 3079), and 0.21 grams of stearic acid. Then, this layer plastisol composition was applied uniformly to one side of one of the fabric squares that were previously coated with the plastisol-containing binding agent. Subsequently, the plastisol-coated fabric layer was placed on top of the fabric square that had been coated with only the plastisol binding composition, in order to bring the plastisol-coated surface into contact with the plastisol-coated surface. layer. This resulted in the formation of a carcass of the tissue material.
    [00024] The fabric housing was then placed in a heated press, maintained at a temperature of 182 ° C (360 ° F), for 10 minutes, under the effective surface pressure of 1.6 x 105 pascals (23.7 pounds per square inch), which required 453.6 kilograms (1000 pounds) of pressure on the 272.6 square centimeters (42.25 square inches) of fabric. The carcass was then cut into strips that were 2.54 centimeters (1 inch) wide and 15.24 centimeters (6 inches) long. The two tissue surfaces were separated according to the ASTM 751 test method to measure skin adhesion using an Instron mechanical tester. The average 3-pull adhesion has been described as 437 N / 5 cm (49.3 lbf / 1 inch) wide, as pulled in the direction of the warp.
    [00025] The fabric housing can then be used in the construction of a short length of the experimental conveyor belt. In such a process, the pellets of the PVC-based thermoplastic elastomer would be released onto a 30.5 cm by 30.5 cm (12 inch by 12 inch) sample of a sheet of fiberglass impregnated with PTFE. The carcass would be placed on top of the pellets and then covered with a second sheet of fiberglass impregnated with PTFE. This construction is placed on the press heated to 200 ° C (400 ° F), at 1.6 x 105 pascals (23.6 psi), for 5 minutes. The construction is removed from the press and the top sheet is removed. A second layer of the PVC-based thermoplastic elastomer pellets is spread over the hot construction, covered with the glass fiber sheet impregnated with PTFE, and placed back in the heated press. The sample is heated to 200 ° C (400 ° F), at 1.6 x 105 pascals (23.6 psi), for 2.5 minutes. A sample of the belt can thus be prepared for analysis. Comparative Example 2
    [00026] A carcass construction was prepared using the same procedure as in Example 1, except that it was placed in a forced air oven between two aluminum plates, at 182 ° C (360 ° F), for 10 minutes. In this experiment, the effective pressure on the carcass tissue was only 276 pascals (0.04 pounds per square inch), which represented 1.18 kg (2.6 pounds) on the 413 square centimeters (64 square inches) of fabric . The average peel adhesion for this construction prepared by this procedure was determined to be only 322 N / 5 cm (36.2 lbf / 1 inch) wide in the warp direction. This example demonstrates the importance of pressure to achieve. Example 3
    [00027] In this experiment, another housing construction was prepared for comparative purposes. The procedure used a binding plastisol, which was prepared by 1180 kg (2600 lb) of emulsion grade poly (vinyl chloride) (PVC) to a vessel containing 508 kg (1119 lb) of diisononyl phthalate (DINP) , 35.3 kg (77.8 lb) of epoxidized soy oil (ESO), and 35.3 kg (77.9 (lb) of calcium / zinc stabilizer (Mark 3079). Then, 1.0 kg ( 2.2 pounds) of 6% by weight Lanxess Binding Agent 2001N (40 percent by weight mixture of 2,4-toluene diisocyanate / 2,6-toluene diisocyanate (TDI) in dibutyl phthalate) was added to 15 , 9 kg (35 pounds) of the previously prepared binding plastisol just before adding it to a loading tank. This step was repeated as the mixture was used in the process. The binding paste was then pumped into a loading tank. immersion, in which a polyester fabric was continuously fed into the immersion tank where it is immersed and then scraped to remove excess plastisol. The tensile strength on this fabric was less than 1.071 k g per cm wide (6 pounds per inch wide) of fabric.
    [00028] The polyester fabric was woven using 11.7 points per cm (29.8 points per inch) of 3000 denier polyester yarn in the warp direction and 3.93 wefts per cm (10.0 wefts per inch) of 4000 denier polyester yarn in the weft direction. This fabric was heat fixed in water before use. Two layers of the tissue were immersed in the binding paste containing the binding agent and then heated to a temperature that was within the range of 71 ° C (160 ° F) to 82 ° C (180 ° F) to pre-gel the plastisol.
    [00029] A layer plastisol was prepared by mixing 884.5 kg (1950 lb) of emulsion grade poly (vinyl chloride) (PVC), 272 kg (600 lb) of calcium carbonate (particle size of 4 microns) and 1.8 kg (4.0 lb) of stearic acid in 603.2 kg (1329.8 pounds) of diisononyl phthalate (DINP), 25.9 kg (57.2 pounds) of soybean oil epoxidated (ESO), 16.9 kg (37.3 pounds) of calcium / zinc stabilizer (Mark 3079). This layer plastisol composition was applied to the bottom layer and heated to 88 ° C (190 ° F) to pre-gel before the two layers were joined between three heated steel cylinders. The pre-gelled carcass was preheated to 160 ° C (320 ° F) just before entering the melting furnace. The residence time in the melting furnace was 11.8 minutes, with the temperature being maintained at 204 ° C (400 ° F). The pressure on the carcass was not measured.
    [00030] A sample of the carcass was cut into strips 2.54 cm (1 inch) wide by 15.2 cm (6 inches) long. The two tissue surfaces were separated according to the ASTM 751 test method to measure skin adhesion using an Instron mechanical tester. Average adhesion has been described as 378 N / 5 cm (42.5 lbf / 1 inch) wide, as pulled in the direction of the warp. Consequently, excellent peel adhesion was obtained using this procedure. Example 4
    [00031] In this experiment, a complete conveyor belt was built using the fundamental points of this invention. The procedure used a binding plastisol, which was prepared by mixing 1180 kg (2600 lb) of emulsion grade poly (vinyl chloride) (PVC) to a vessel containing 508 kg (1119 lb) of diisononyl phthalate ( DINP), 35.3 kg (77.8 lb) of epoxidized soybean oil (ESO), and 35.3 kg (77.9 lb) of calcium / zinc stabilizer (Mark 3079). Then, 1.0 kg (2.2 pounds) of Lanxess Binding Agent 2001N at 6% by weight (mixture at 40 weight percent of 2,4-toluene diisocyanate / 2,6-toluene diisocyanate (TDI) in dibutyl phthalate) was added to 15.9 kg (35 pounds) of the previously prepared binding plastisol just before adding it to a cargo tank. This step was repeated as the mixture was used in the process. The bonding paste was continuously applied to the surface of a polyester fabric. The excess plastisol was removed by a cylinder. The polyester fabric was woven using 14.0 points per cm (35.5 points per inch) of 2000 denier polyester yarn in the warp direction and 4.13 wefts per cm (10.5 wefts per inch) of yarn. 4000 denier polyester in the weft direction. This fabric was heat fixed in water before use. Two layers of the tissue were immersed in the binding paste containing the binding agent and then heated to 71 ° C (160 ° F) to 82 ° C (180 ° F) to pre-gel the plastisol.
    [00032] Then, a layer plastisol was prepared by mixing 884.5 kg (1950 lb) of emulsion grade poly (vinyl chloride) (PVC), 272 kg (600 lb) of calcium carbonate (size of 4 micron particle) and 1.8 kg (4.0 lb) of stearic acid in 603.2 kg (1329.8 pounds) of diisononyl phthalate (DINP), 25.9 kg (57.2 pounds) of oil epoxidized soybean (ESO), 16.9 kg (37.3 pounds) of calcium / zinc stabilizer (Mark 3079). It was subsequently applied to the bottom layer of the fabric and heated to 88 ° C (190 ° F) to pre-gel before the two layers were joined between four heated steel cylinders. The pre-gelled carcass was then fed between the four heated cylinders to heat it to a surface temperature of 185 ° C (365 ° F). The residence time on the heated cylinders was 6 minutes.
    [00033] A sample of the carcass was cut into strips 2.54 cm (1 inch) wide by 15.2 cm (6 inches) long. The two tissue surfaces were separated according to the ASTM 751 test method to measure skin adhesion using an Instron mechanical tester. Average adhesion has been described as 213.5 N / 5 cm (24.0 lbf / 1 inch) wide, as pulled in the direction of the warp. The adhesion of the desired layer was not obtained because the parameters established in this invention were not reached.
    [00034] A coating that was comprised of a mixture of plasticized poly (vinyl chloride) and chlorinated polyethylene in the form of thermoplastic elastomer pellets (TPE) was applied to a belt made of fiberglass impregnated with PTFE. These TPE pellets had an average particle size of approximately 0.5 mm. The carcass created above was placed on top of the pellets. A second layer of TPE pellets was applied to the carcass. This construction was fed between two of the PTFE impregnated belts and fed through an oven at 216 ° C (420 ° F), under a pressure of less than 2.1 x 105 pascals (30 psi). The residence time in the oven was 9 minutes.
    [00035] Although certain modalities and representative details have been shown for the purpose of illustrating the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made to it, without departing from the scope of the present invention.
    权利要求:
    Claims (19)
    [0001]
    1. Method of making a belt, characterized by the fact that it comprises the steps of (1) impregnating a fabric material with a binding agent in a plastisol to form a coated fabric material, (2) applying a layer of plastisol between two or more layers of coated fabric, thereby creating a belt housing, (3) continuously feeding the belt housing to a double belt press, which compresses the impregnated fabric materials together with the layer (s) plastisol, at a pressure of at least 34,500 Pa (5 psi), to produce a preformed tissue housing, at the same time (4) heat the preformed tissue housing to a temperature that is within the range of 182 ° C to 232 ° C for a period of at least 6 minutes, (5) continuously removing the fabric housing from the double belt press, (6) spreading a thermoplastic elastomer resin composition over the top and bottom surfaces of the fabric, (7) compress the composition tion of thermoplastic elastomer resin on the upper and lower surfaces of the fabric housing, continuously feeding the fabric reinforcement to a second double-belt press, which is maintained at a temperature of at least 171 ° C and a hair pressure minus 34,500 Pa, and (8) continuously remove the finished belt from the second double belt press.
    [0002]
    2. Method according to claim 1, characterized by the fact that the fabric material is a polyester fabric.
    [0003]
    3. Method according to claim 1, characterized by the fact that the fabric material is a nylon fabric.
    [0004]
    4. Method according to claim 2, characterized in that the polyester fabric is comprised of polyethylene naphthalate.
    [0005]
    5. Method according to claim 1, characterized in that the binding agent is comprised from about 20% by weight to about 60% by weight of toluene diisocyanate and about 40% by weight at about 80% by weight of a plasticizer.
    [0006]
    Method according to claim 1, characterized in that the internal surfaces of a fabric material are sequentially coated with a mixture of a plastisol and a binding agent, and then a plastisol to form coated fabric material.
    [0007]
    7. Method according to claim 1, characterized by the fact that the weight ratio of the binding agent to plastisol is within the range of 2:98 to about 10:90.
    [0008]
    8. Method according to claim 1, characterized in that the fabric materials coated on the double belt press are compressed together at a pressure within the range of 96,500 Pa to 207,000 Pa to produce a preformed fabric reinforcement .
    [0009]
    9. Method according to claim 8, characterized in that the preformed fabric reinforcement is maintained in the double belt press at a temperature that is within the range of about 193 ° C to about 218 ° C for a period of at least 8 minutes.
    [0010]
    Method according to claim 1, characterized in that the thermoplastic elastomer resin composition is a poly (vinyl chloride) composition comprised of poly (vinyl chloride) and a plasticizer.
    [0011]
    11. Method according to claim 1, characterized in that the belt of the double belt press has belt surfaces which are comprised of stainless steel.
    [0012]
    12. Method according to claim 11, characterized in that the composition of poly (vinyl chloride) resin is further comprised of at least one filler.
    [0013]
    13. Method according to claim 12, characterized in that the composition of poly (vinyl chloride) resin is further comprised of a chlorinated polyethylene.
    [0014]
    14. Method according to claim 12, characterized in that the composition of poly (vinyl chloride) resin is further comprised of an antistatic agent.
    [0015]
    15. Method according to claim 1, characterized by the fact that the belt of the double belt press has belt surfaces which are comprised of polytetrafluoroethylene impregnated with glass fiber.
    [0016]
    16. Method according to claim 1, characterized by the fact that the double belt press heats the preformed fabric reinforcement by conduction heating.
    [0017]
    17. Method according to claim 1, characterized in that the thermoplastic elastomer resin composition is a polyurethane composition.
    [0018]
    18. Method according to claim 1, characterized by the fact that the thermoplastic elastomer resin composition is polypropylene.
    [0019]
    19. Belt, characterized by the fact that it is made by the process, as defined in claim 1.
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    同族专利:
    公开号 | 公开日
    ZA201401302B|2015-05-27|
    EP2772455A1|2014-09-03|
    MX2014002191A|2016-05-24|
    RU2014107402A|2015-09-10|
    AU2014200716B2|2015-03-26|
    CL2014000368A1|2015-03-06|
    CA2843936C|2015-04-07|
    RU2566176C2|2015-10-20|
    CN104003102B|2017-04-12|
    US20140021021A1|2014-01-23|
    AU2014200716A1|2014-09-11|
    BR102014004579A2|2015-12-01|
    CA2843936A1|2014-08-27|
    PL2772455T3|2016-02-29|
    MX355802B|2018-01-05|
    AR094895A1|2015-09-09|
    ZA201404604B|2016-05-25|
    EP2772455B1|2015-09-02|
    US8910780B2|2014-12-16|
    CN104003102A|2014-08-27|
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    法律状态:
    2015-12-01| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2017-09-19| B25F| Entry of change of name and/or headquarter and transfer of application, patent and certif. of addition of invention: change of name on requirement|Owner name: VEYANCE TECHNOLOGIES, INC. (US) |
    2018-01-16| B25D| Requested change of name of applicant approved|Owner name: CONTITECH USA, INC. (US) |
    2018-11-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-19| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-10| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-05| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/02/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201361769832P| true| 2013-02-27|2013-02-27|
    US61/769,832|2013-02-27|
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