CN205614976U - A flat bush for rolling membrane is extruded - Google Patents
A flat bush for rolling membrane is extruded Download PDFInfo
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- CN205614976U CN205614976U CN201620430409.1U CN201620430409U CN205614976U CN 205614976 U CN205614976 U CN 205614976U CN 201620430409 U CN201620430409 U CN 201620430409U CN 205614976 U CN205614976 U CN 205614976U
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- flat mouth
- film extrusion
- transit joint
- export
- mouth die
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Abstract
The utility model provides a flat bush for rolling membrane is extruded, includes the recipient that is connected with the machine of bulldozing, the exit end of recipient is connected with transition joint's entry end, transition joint's exit end is connected with the forming die's of platykurtic entry end, transition joint has from its entry end to the exit end the narrow first inner chamber that contracts gradually, forming die's entry end is equipped with the inside narrow second inner chamber that contracts gradually, the exit end of second inner chamber is connected with the extension chamber, the extension chamber have along the sectional area of blank flow direction scale up in proper order, invariable, degressive gradient changes. The utility model discloses following beneficial effect has: the utility model provides a flat bush through the design to mould cavity, make the mould embryo once take shape, and the breadth width is neat, and membrane base thickness homogeneity is high, and is vertical, lateral stretching intensity uniformity is good.
Description
Technical field
The utility model belongs to thermoplastic manufacture field, is specifically related to a kind of flat mouth die for calendered film extrusion.
Background technology
PTFE, i.e. polytetrafluoroethylmaterial material, industrial production and the environmental protection industry day by day risen are applied more and more extensive, it is used for industry the earliest and life house supplies water, the sealing of steam line, the packing etc. of filter, the aspects the such as nowadays apparatus at medical field produces such as joint prosthesis, artificial blood vessel, the various types of filtration device of field of Environment Protection, the waterproof breathable garment making of daily life field have also obtained further expansion.
In the earlier processing steps of the said goods, it all be unable to do without the making of PTFE film base, traditional PTFE film base preparation method is to be shaped the round bar of φ 20 ~ φ 40 mm by round mouth mould pre-extrusion, repeatedly suppress by rolling equipment and to complete, the feature of the method is to utilize a pair stack, make the prefabricated bar of PTFE pass through between stack, prefabricated bar by when by two rollers rotation and friction produce two to stress calendering make film base.During Gai, the friction at each interface of a pair stack prefabricated bar with PTFE is different, sometimes go up stack frictional force big, sometimes bottom calender roll frictional force is big, make the film base transverse tensile strength otherness obtaining bigger, in turn resulting in film base edge irregular, surface quality is not high, exist needs follow-up be sized, the shortcoming such as machining, cutting fabric width.
Therefore, PTFE extrusion die of the prior art is studied by the utility model.
Utility model content
For deficiency of the prior art, the utility model provides a kind of flat mouth die for calendered film extrusion, and PTFE mold base can be made once-forming, and breadth width is neat, and film base thickness evenness height, longitudinally, laterally tensile strength uniformity are good.
The utility model is achieved through the following technical solutions.
A kind of flat mouth die for calendered film extrusion, including the recipient being connected with pushing machine, the port of export of described recipient is connected with the arrival end of transit joint, and the port of export of described transit joint is connected with the arrival end of the shaping dies of flat；Described transit joint has from its arrival end to the first inner chamber of the port of export gradually narrow contracting, the arrival end of described shaping dies is inwardly provided with the second inner chamber of gradually narrow contracting, the port of export of described second inner chamber is connected with extension chamber, and described extension chamber has incremental, constant, the graded successively decreased successively along the sectional area of blank flow direction.
Compared to traditional round mouth mould of the prior art, Promethean in the utility model have employed flat mouth die, the processing method being shaped by flat mouth gradient Spread Extrusion, there is once-forming feature, and breadth width is neat, film base thickness evenness is high, longitudinally, laterally the good advantage of tensile strength uniformity.Further, extension chamber in the utility model has the sectional area of graded, and during blank enters extension chamber from the second inner chamber, blank experienced by compression, the process loosened, recompress, blank is cured repeatedly in this course, finally by being dimensioned extrusion.
Flat mouth gradient Spread Extrusion forming refers to blank under a constant, sends in specific mould, in the flat mouth die in the utility model, spreads through gradient, and sectional area, by extruding multiplying power change, is finally configured to the processing method of required goods.Also may be interpreted as with pressure ram to the blank pressurization being placed in recipient, be allowed to produce Plastic Flow, thus acquisition is corresponding and the mould-forming method of the film base product of the type hole shape of mould.
As preferably, described recipient, transit joint, shaping dies are provided with heating ring or heating plate, provide heating function so that it is in blank be heated its mobility of increase.
As preferably, the arrival end of described shaping dies is provided with protuberance, and the port of export of described transit joint is provided with and coordinates the depressed part installed with this protuberance, during installation, protuberance inserts in depressed part, easy for installation, also make junction more mate, it is ensured that seamless link simultaneously.
As preferably, the outer wall of described protuberance is provided with external screw thread, and the inwall of described depressed part is provided with internal thread, and protuberance is linked together by threaded engagement with depressed part.
As preferably, described shaping dies is made up of two and half die bodys, easy to assembly.
As preferably, described second inner chamber includes narrow contracting portion, the rectangular portion setting gradually, the described narrow arrival end in contracting portion aligns with the port of export of transit joint, described rectangular portion is connected with extension chamber, described extension chamber is the trapezium structure of gradually flat, narrow contracting portion in this structure is for receiving the blank in transit joint, the inner chamber of narrow contracting makes it extrude the certain pressure of generation and flow velocity faster, after blank is by rectangular portion the narrowest, in extension chamber, uniform extension spreads out rapidly, is molded in flat shape of the mouth as one speaks chamber.
As preferably, the longitudinal angle of described extension chamber and rectangular portion junction is 12 °, horizontal angle is 80 °, and this extension chamber has the trapezium structure of preferably gradually flat.
It as preferably, is fixed together by clip between described recipient and transit joint.
Compared with prior art, the utility model has the advantages that the flat mouth die in the utility model, by the design to mold cavity, enable mold base once-forming, and breadth width is neat, film base thickness evenness is high, and longitudinally, laterally tensile strength uniformity is good.
Brief description
Fig. 1 is the structural representation of side-looking.
Fig. 2 is the structural representation of partial top.
Fig. 3 is the schematic diagram of the protuberance on shaping dies.
Fig. 4 is the schematic diagram of rectangular portion.
Fig. 5 is the schematic diagram of transit joint.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the utility model is further described.
See Fig. 1 to Fig. 5, a kind of flat mouth die for calendered film extrusion, including the inside surface roughness of this recipient 21 of recipient 21(being connected with pushing machine 11 is Ra0.4), the roughness of this transit joint 22 surface of internal cavity of the port of export of described recipient 21 and transit joint 22(is Ra0.8) arrival end be connected, the port of export of described transit joint 22 is connected with the arrival end of the shaping dies 23 of flat, the roughness of this shaping dies 232 surface of internal cavity of described shaping dies 23(is Ra0.4) it is made up of two and half die bodys, two and half die bodys position with straight pin, M12 and M16 high strength exploitation fastens；Described transit joint 22 has from its arrival end to the first inner chamber 223 of the port of export gradually narrow contracting, the arrival end of described shaping dies 23 is inwardly provided with the second inner chamber of gradually narrow contracting, the port of export of described second inner chamber is connected with extension chamber 234, and described extension chamber 234 has incremental, constant, the graded successively decreased successively along the sectional area of blank flow direction.
In present embodiment, described recipient the 21st, transit joint the 22nd, shaping dies 23 is provided with heating ring 211,221,231 or heating plate.The arrival end of described shaping dies 23 is provided with protuberance 236, the port of export of described transit joint 22 is provided with and coordinates the depressed part 222 installed with this protuberance 236, the outer wall of described protuberance 236 is provided with external screw thread, the inwall of described depressed part 222 is provided with internal thread, and protuberance 236 is linked together by threaded engagement with depressed part 222.
In present embodiment, described second inner chamber includes the 232nd, rectangular portion 233, narrow contracting portion setting gradually, the arrival end in described narrow contracting portion 232 aligns with the port of export of transit joint 22, described rectangular portion 233 is located at mold center and is connected with extension chamber 234, junction changes through round and smooth corner, (laterally) 80 ° of angles, the inverted trapezoidal elongated hole of upper and lower (longitudinally) 12 ° of angle gradually flat, namely described extension chamber 234 about formation；It is fixed together by clip 29 between described recipient 21 and transit joint 22.
As it was previously stated, the sectional area in extension chamber 234 is by the big end (discharge end) of the port of export of rectangular portion 233 to trapezoidal elongated hole, forming graded incremental, constant, that successively decrease, during this, PTFE material base is cured repeatedly；The sectional area in the big end exit of trapezoidal elongated hole is 1.6 times of rectangular portion 233 sectional area.Trapezoidal elongated hole brings out mouth greatly until flat mouth gradient Spread Extrusion finishing die exit is a uiform section oblong aperture, devise the boss 27 of two 130mmX100mmX0.1mm on the above-below direction of this uiform section oblong aperture, be used for preventing elastic blank from assembling to centre during extrusion.
During work, under pushing the effect of pressure ram 12 of machine 11, PTFE material base enters in the bellmouth (the i.e. first inner chamber 223) of transit joint 22, this portion structure plays the role of first precompressed to material base, subsequently, the PTFE material base being pressed through in advance entered by narrow contracting portion 232 rectangular portion 233 is carried out moulding for the first time, then, tentatively moulding PTFE material base extruding imports inverted trapezoidal, and in the extension chamber 234 with certain angle of inclination, graded through sectional area, make PTFE material base experienced by and compress-loosen-process that recompresses, PTFE material base is cured repeatedly in this course, it is sized extrusion finally by one section of uiform section oblong aperture.
Using the mould in the utility model mainly to have three maturation stage in the processing whole process of PTFE calendered film film base, the first stage is the squeezing, maturing in the bellmouth of transit joint 22；Second stage is by squeezing, maturing during rectangular portion 233；Phase III is when extension chamber 234, with the graded of sectional area, forms the bigger squeezing, maturing of duration；Control between 60 ~ 90 degree with the external temperature in these three stage.The above three stage is all that the process being plastically deformed is especially through the passage of variable cross-section band corner, the molecule refining phenomenon of material base tissue is more uniformly distributed and substantially, original average molecular structure is extruded in this process, final average molecular structure is multiplied, the film base both sides of extrusion are straight, face uniform color, and view picture film base tensile strength is greatly improved along the uniformity of vertical and horizontal.By test and production, by the flat mouth die of flat mouth gradient Spread Extrusion shaping dies of different bores, the film base of fabric width 100 ~ 500mm, thickness 1 ~ 5mm can be produced, use the pushing machine of 41.8T thrust can meet use.
The above, the utility model provides and a kind of is combined by using the flat mouth gradient Spread Extrusion shaping dies of recipient with function of temperature control, transit joint and band function of temperature control, and guide passage is designed as the gradient-structure with corner, finally realize compared with small column stock extrusion molding wide cut, the production of equal thick film base.Laborsaving, energy-conservation, extrusion film base any surface finish, fabric width neat.The film base of extrusion is in terms of quality, the uniformity of vertical and horizontal tensile strength is relatively greatly improved than round mouth mould, production for biaxial stretching film product provides good Ranvier's membrane base, such as the making for raw material band, make the often volume raw material band after cutting completely the same in terms of quality, revolutionize the raw material band in the past being produced by round mouth mould film base, spotty drawback after cutting.
Protection domain of the present utility model includes but is not limited to embodiment of above; protection domain of the present utility model is as the criterion with claims, replacement that any those skilled in the art making this technology is readily apparent that, deformation, improves and each falls within protection domain of the present utility model.
Claims (9)
1. the flat mouth die for calendered film extrusion, including the recipient (21) being connected with pushing machine (11), it is characterized in that, the port of export of described recipient (21) is connected with the arrival end of transit joint (22), and the port of export of described transit joint (22) is connected with the arrival end of the shaping dies (23) of flat；Described transit joint (22) has from its arrival end to first inner chamber (223) of the port of export gradually narrow contracting, the arrival end of described shaping dies (23) is inwardly provided with the second inner chamber of gradually narrow contracting, the port of export of described second inner chamber is connected with extension chamber (234), and described extension chamber (234) has incremental, constant, the graded successively decreased successively along the sectional area of blank flow direction.
2. a kind of flat mouth die for calendered film extrusion according to claim 1, it is characterised in that described recipient (21), transit joint (22), shaping dies (23) are provided with heating ring or heating plate (211,221,231).
3. a kind of flat mouth die for calendered film extrusion according to claim 2, it is characterized in that, the arrival end of described shaping dies (23) is provided with protuberance (236), and the port of export of described transit joint (22) is provided with and coordinates the depressed part (222) installed with this protuberance (236).
4. a kind of flat mouth die for calendered film extrusion according to claim 3, it is characterized in that, the outer wall of described protuberance (236) is provided with external screw thread, and the inwall of described depressed part (222) is provided with internal thread, and protuberance (236) is linked together by threaded engagement with depressed part (222).
5. a kind of flat mouth die for calendered film extrusion according to claim 4, it is characterised in that described shaping dies (23) is made up of two and half die bodys.
6. a kind of flat mouth die for calendered film extrusion according to any one of claim 1 to 5, it is characterized in that, described second inner chamber includes narrow contracting portion (232), the rectangular portion (233) setting gradually, the arrival end of described narrow contracting portion (232) aligns with the port of export of transit joint (22), described rectangular portion (233) is connected with extension chamber (234), and described extension chamber (234) is the trapezium structure of gradually flat.
7. a kind of flat mouth die for calendered film extrusion according to any one of claim 1 to 5, it is characterised in that the longitudinal angle of described extension chamber (234) and rectangular portion (233) junction is 12 °, horizontal angle is 80 °.
8. a kind of flat mouth die for calendered film extrusion according to claim 6, it is characterised in that the longitudinal angle of described extension chamber (234) and rectangular portion (233) junction is 12 °, horizontal angle is 80 °.
9. a kind of flat mouth die for calendered film extrusion according to any one of claim 1 to 5, it is characterised in that be fixed together by clip (29) between described recipient (21) and transit joint (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430409.1U CN205614976U (en) | 2016-05-13 | 2016-05-13 | A flat bush for rolling membrane is extruded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430409.1U CN205614976U (en) | 2016-05-13 | 2016-05-13 | A flat bush for rolling membrane is extruded |
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| Publication Number | Publication Date |
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| CN205614976U true CN205614976U (en) | 2016-10-05 |
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| CN201620430409.1U Active CN205614976U (en) | 2016-05-13 | 2016-05-13 | A flat bush for rolling membrane is extruded |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881863A (en) * | 2016-05-13 | 2016-08-24 | 宁波昌祺氟塑料制品有限公司 | Flat opening mold used for extruding of calendering film |
-
2016
- 2016-05-13 CN CN201620430409.1U patent/CN205614976U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881863A (en) * | 2016-05-13 | 2016-08-24 | 宁波昌祺氟塑料制品有限公司 | Flat opening mold used for extruding of calendering film |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |