• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an extruder welding device for welding of thermoplastic materials, with a arranged in a housing rotatably driven screw for plasticizing the thermoplastic material, wherein downstream in the transport direction of the screw in the housing further a compression body is arranged, wherein between the compression body (3) and an inside Wall of the housing an annular gap is formed, and wherein in the transport direction behind the compression body (3) in the housing a pinhole (6) along its circumference (7) is positively received, characterized in that the pinhole (6) at least one passage (8 ) which is open towards the periphery (7).
    公开号:CH706302B1
    申请号:CH00641/13
    申请日:2013-03-21
    公开日:2016-12-15
    发明作者:Bruchhof Oliver；Krebs Georg
    申请人:Munsch Kunststoff-Schweisstechnik Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a Extruderschweissgerät for welding of thermoplastic materials, with a arranged in a housing rotatably driven screw for plasticizing the thermoplastic material, wherein downstream in the transport direction of the screw in the housing further arranged a compression body, wherein between the compression body and an inside Wall of the housing an annular gap is formed, and wherein in the transport direction behind the compression body in the housing a pinhole is added positively along its circumference.
    A generic Extruderschweissgerät is known from EP 0 663 277 B1. In generic devices, the housing is at least partially formed as a melting chamber, d. H. equipped with a heat source by means of which the thermoplastic material transported in the extruder welding machine by the rotary drivable screw plasticized. The thermal energy is forwarded via the inside wall of the housing to the thermoplastic material.
    For a satisfactory welding result, it is essential that the plastic material leaving the extruder welding apparatus is sufficiently plasticized on the one hand, i. has a certain minimum temperature, and on the other hand is sufficiently compacted, i. any trapped air bubbles have been expelled from the extruder welder during the plasticizing process prior to the material exiting. Furthermore, in order to obtain uniform welding results, it is necessary that the melt be homogeneous, i. has sufficient mixing.
    It is therefore the object of the invention to propose a generic extruder welding, which allows the production of a well-mixed, highly plasticized and compacted plastic welding material.
    This object is achieved according to the invention by an extruder welding apparatus of the aforementioned type, wherein the pinhole has at least one passage for plasticized plastic material which is open to the periphery of the pinhole.
    The inventively provided use of passages, which are open to the periphery of the pinhole and thus directly adjacent to the inside wall of the melting chamber, has the advantage that the melt is in the area of the pinhole directly in contact with the melting chamber, whereby the heat transfer to the melt is improved. This ensures that the melt does not cool down even when it passes through the pinhole and does not lose its plasticity. Due to the fact that thus the viscosity of the melt is kept low even when passing through the pinhole, at the same time increases the mixability and compressibility of the melt.
    In one embodiment of the invention, the pinhole on a plurality of apertures open to the periphery, wherein the positive connection between the pinhole and the housing is formed by formed between adjacent passages webs. Thus, in one embodiment, it is conceivable that adjacent passages are separated from each other by a web configured as described above. In this embodiment, the positive connection between the pinhole and the housing of the extruder welding device is thus made just between the free ends of the webs and the inside wall of the housing.
    To further increase the mixing of the plasticized plastic material is provided in one embodiment, that the webs have passages in the form of holes. Unlike the above-described passages, which are open to the periphery of the pinhole, the apertures formed as holes in the webs are circumscribed limited. The cross sections of the holes should not be limited to any specific geometries. For example, they can be cylindrical, but also oval or rectangular in cross-section.
    The mixing of the plasticized plastic material can be further increased in the aforementioned embodiment in that the passages formed in the webs as bores converge in the transport direction of the screw or in the transport direction of the plasticized plastic material. Particularly preferred in this embodiment is that at least two of the bores unite from an inlet end of the pinhole to an outlet end of the pinhole toward a common outlet at the outlet end.
    It is preferred that the apertures open to the periphery of the pinhole and / or the webs at least partially have an axis of symmetry which extends through a symmetry point of the pinhole radially outwardly and in the direction perpendicular to the circumference of the pinhole. Preferably, the passages or the webs are arranged with respect to their axes of symmetry at the same angular distance from each other. It has been found that the best results in terms of plasticity, mixing and compression of the melt are achieved in as described above highly symmetrically distributed passages or webs.
    In an easy to maintain, to be cleaned and converted depending on the plastic material to be processed embodiment of the invention, it is provided that the pinhole and the compression body are integrally formed and off as a single component for the above purposes from the Extruderschweissgerät and again can be installed. The exact positioning of the unit of pinhole and compression body in the housing is particularly simple on the positive connection between the periphery of the pinhole and the housing. In principle, however, the pinhole and the compression body can also be designed as separate components. These then preferably have means for the precise arrangement of pinhole and compression body to each other.
    Preferably, the pinhole is connected via a connecting web to the compression body, wherein between the connecting web and the housing an annular gap is formed, which has a larger permeable cross-sectional area than the annular gap between the compression body and the housing in the region of a connection point between the Compression body and the connecting web, d. H. is formed immediately before the transition from the compression body to the connecting web. Thus, the expansion chamber downstream of the compression body is formed in a particularly elegant manner in generic devices in the transport direction.
    With the extruder welding device according to the invention, cooling of the individual strands of the melt formed by the perforated diaphragm and thus also the occurrence of cracks on the surface of the partially solidified plastic materials observed during the processing of some materials with the aid of extruder welding apparatuses known from the prior art is effectively achieved avoided.
    With the help of the compression body Extruderschweissgerät can be adjusted for the use of different welding materials. Relevant welding material properties, depending on which the geometry of the compression body can be selected, are the temperature behavior or the nature of the melted material. The replaceable compression body in particular makes a screw change in the change to a welding material with other material properties unnecessary. Instead of the screw, according to the invention, only the compression body can be adapted.
    The inventive extruder welding is suitable both for the use of added as welding wire plastic material as well as for the use of granules, especially for different granular forms. Due to the one-piece design of the compression body and pinhole, the extruder welding device according to the invention is particularly easy to convert for the processing of different materials without having to make changes to the rotationally driven screw and / or to the extruder housing. In particular, the coordination of the extruder welding apparatus on newly developed high-performance plastics, which necessitate the use of very specific apertured diaphragms as well as compression bodies and their combination, is thereby also possible. In particular, embodiments are conceivable in which the compression body is not only, as known from the prior art, cylindrical or pyramidal, but for example, also designed as a polygon or oval.
    Further details of the invention will be explained with reference to the following figures. Showing:<Tb> FIG. 1 <SEP> a generic Extruderschweissgerät according to the prior art;<Tb> FIG. 2 <SEP> is a cross-sectional view and a top view of a pinhole and a compression body integrally formed according to a first embodiment of the invention;<Tb> FIG. 3 <SEP> is a cross-sectional view and a plan view of a pinhole and a compression body integrally formed according to a second embodiment of the invention;<Tb> FIG. 4 <SEP> two cross-sectional views and a plan view of a pinhole and a compression body, which are integrally formed, and<Tb> FIG. 5 <SEP> Cross-sectional views of three variants of a pinhole and a compression body with a particular configuration of the compression body as a compression cone.
    In Fig. 1, a generic extruder welding apparatus according to the prior art is shown. This comprises a housing 1, which forms a melting chamber, which is heated by a heat source, a rotatably drivable screw 2 for plasticizing a thermoplastic material and a compression body 3, in the transport direction of the rotary drivable screw 2 and the thermoplastic plastic material of the rotary drivable screw 2 is arranged downstream. Between the compression body 3 and an inside wall 4 of the housing 1, an annular gap 5 is formed. In the transport direction behind the compression body 3, a pinhole 6 is arranged, which is received in the housing 1 in a form-fitting manner along its circumference. In the illustrated cross-sectional view it can be seen that the openings 8 provided in the perforated plate 6 are arranged at a distance from the inside wall 4 of the housing 1 and thus from the circumference 7. For the heat input provided via the housing 1 to the thermoplastic material to be plasticized, it is thus necessary for the thermal energy to be transmitted to be passed through essential parts of the perforated panel 6, whereby corresponding losses occur due to the heat capacity of the perforated panel.
    2, a first embodiment of the inventive pinhole 6 is shown in combination with a one piece with this formed compression body 3. Also in this embodiment, in turn, the compression body 3 is connected via a connecting web 11 with the pinhole 6. In the webs 9 holes 10 are provided. In addition to the holes 10 passages 8 are formed, which are open to the periphery 7 of the pinhole 6 out. At their free ends and thus along the circumference 7, the webs 9 have a contour which is formed for the positive reception of the pinhole 6 in the interior of the housing 1 (not shown).
    Fig. 3 shows a further embodiment in which in turn the compression body 3 is connected to the pinhole 6 via a connecting web 11. Furthermore, the connection point 13 between the compression body 3 and the connecting web 11 can be seen. In the plan view can be seen that the passages 8 are formed as U-shaped grooves. It follows that the webs 9 in cross section are substantially triangular or tapered in the direction of the point of symmetry P. Furthermore, it can be seen that both the passages 8 and the webs 9 each have an axis of symmetry S (only one axis of symmetry is shown by way of example), on the one hand by the point of symmetry P of the aperture 6 and on the other hand radially outward and in the direction perpendicular to the Perimeter 7 of the aperture 6 run. In addition to the illustrated symmetrical distribution of the passages 8, an asymmetrical or arbitrary distribution is possible in other embodiments.
    In Fig. 4, a pinhole is shown, in which the holes 10 in the pinhole 6 in the transport direction of the rotationally driven screw or the thermoplastic material converge towards each other. The two cross-sectional views correspond to 60 ° offset from each other cross sections, as it results directly from the synopsis with the top view. Furthermore, it can be seen from the plan view of the outlet end 14 of the perforated plate 6 that exactly three of the total of six bores 10 are combined at the outlet end 14 to form a common outlet 15. The unified bores 10 adjoin the outlet end 14 directly to an outer edge of the common outlet 15.
    Fig. 5 shows cross-sectional views of three variants of a pinhole, in which the compression cone 3 has a conically tapering in the transport direction of the plasticized plastic material constriction through which the plasticized material is driven. The taper has the consequence that the plasticized plastic material, which is driven into the constriction of the compression body 3, is compressed. At the end of the thus formed compression body 3 open in the variant according to the upper illustration bores 10, which connect the end of the compression body 3 with the outlet end 14 of the pinhole 6 for the transport of the plasticized plastic material.
    The variant of this embodiment according to the middle illustration differs in that the pinhole 6 is connected via the connecting web 11 with the compression body 3. At the narrow end of the compression body 3 holes 10 are provided, which open into a between the housing 1 (not shown) of the extruder welding and the web 11 forming annular gap. Further holes 10, which pass through the perforated plate 6 in the longitudinal direction, form a fluidic connection for the transport of plastic material between the annular gap and the outlet end 14.
    In the lower illustration of FIG. 5, a variant is shown, in which, similar to the embodiment according to FIG. 4, at least some of the bores 10 join to the outlet end 14 towards a common outlet 15. This embodiment has the advantage that the separate plastic material strands, which are transported through the bores 10, mix better at the outlet end 14 of the perforated diaphragm 6 to form a homogeneous material strand.
    The features disclosed in the foregoing description, in the drawing and in the claims features of the invention may be essential within the scope of the claims, both individually and in any combination for the realization of the invention.
    LIST OF REFERENCE NUMBERS
    [0025]<tb> 1 <SEP> Housing, melting chamber<Tb> 2 <September> snail<Tb> 3 <September> compression body<Tb> 4 <September> Wall<Tb> 5 <September> annular gap<Tb> 6 <September> pinhole<Tb> 7 <Sept.> extent<Tb> 8 <September> passage<Tb> 9 <September> Steg<Tb> 10 <September> Hole<Tb> 11 <September> connecting web<Tb> 12 <September> annular gap<Tb> 13 <September> junction<Tb> 14 <September> outlet<Tb> 15 <September> outlet
    权利要求:
    Claims (9)
    [1]
    1. Extruder welding device for welding thermoplastic materials, with a in a housing (1) arranged rotatably driven screw (2) for plasticizing the thermoplastic material, wherein downstream in the transport direction of the screw (2) in the housing (1) arranged a compression body (3) wherein between the compression body (3) and an inside wall (4) of the housing (1) an annular gap (5) is formed, and wherein in the transport direction behind the compression body (3) in the housing (1) has a pinhole (6) is positively received along its circumference (7), characterized in that the pinhole (6) has at least one passage (8) which is open to the periphery (7).
    [2]
    2. Extruderschweissgerät according to claim 1, characterized in that the pinhole (6) has a plurality of to the periphery (7) open out passages (8), wherein the positive connection between the pinhole (6) and the housing (1) via between adjacent webs (8) formed webs (9) is formed.
    [3]
    3. extruder welding apparatus according to claim 2, characterized in that the webs (9) at least in each case a further passage, which is formed as a bore (10).
    [4]
    4. Extruder welding device according to one of the preceding claims, characterized in that the pinhole (6) and the compression body (3) are integrally formed.
    [5]
    5. Extruderschweissgerät according to one of claims 1 to 3, characterized in that the perforated plate (6) and the compression body (3) are formed as separate components.
    [6]
    6. Extruderschweissgerät according to claim 4 or 5, characterized in that the pinhole (6) via a connecting web (11) with the compression body (3) is connected, wherein between the connecting web (11) and the inside wall (4) of the housing ( 1) an annular gap (12) is formed, which has a larger cross-sectional area than the annular gap (5) between the compression body (3) and the inside wall (4) of the housing (1) in the region of a connection point (13) between the Compression body (3) and the connecting web (11) is formed.
    [7]
    7. Extruderschweissgerät according to one of claims 3 to 6, characterized in that at least two of the webs (9) as bores (10) running passages converge in the transport direction.
    [8]
    8. extruder welding apparatus according to claim 7, characterized in that the at least two of the converging bores (10) to an outlet end (14) of the pinhole (6) merge towards a common outlet (15).
    [9]
    9. extruder welding device according to one of claims 2 to 8, characterized in that the at least one passage (8) and / or at least one of the webs (9) has an axis of symmetry (S) by a point of symmetry (P) of the pinhole (6 ) extends radially outwardly and in the direction perpendicular to the circumference (7) of the pinhole (6).
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    同族专利:
    公开号 | 公开日
    DE102012006331B4|2015-12-24|
    CH706302A2|2013-09-30|
    DE102012006331A1|2013-10-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2006941A1|1970-02-16|1971-08-26|Siemag Siegener Masch Bau|Plasticising extruder perforated disc|
    DE4400778C2|1994-01-13|1997-04-03|Munsch Kunststoff Schweistechn|Extruder welding machine for welding thermoplastic materials|
    DE29923036U1|1999-12-30|2000-02-24|Dohle Extrusionstechnik Gmbh|Extruder welding machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102012006331.8A|DE102012006331B4|2012-03-28|2012-03-28|Extruder welding machine for welding thermoplastic materials|
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