CN213260665U - Continuous forming equipment for polytetrafluoroethylene plate - Google Patents
Continuous forming equipment for polytetrafluoroethylene plate Download PDFInfo
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- CN213260665U CN213260665U CN202022110843.0U CN202022110843U CN213260665U CN 213260665 U CN213260665 U CN 213260665U CN 202022110843 U CN202022110843 U CN 202022110843U CN 213260665 U CN213260665 U CN 213260665U
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Abstract
This continuous former of polytetrafluoroethylene panel is including the lower fixed profiled sheeting that is the level setting and the lift activity profiled sheeting that is located fixed profiled sheeting top down and is parallel with fixed profiled sheeting down, the upper surface both sides of fixed profiled sheeting down are connected with the constant width shaping flange and two constant width shaping flanges are parallel to each other through dismantling coupling mechanism respectively, thereby lift activity profiled sheeting is connected with lift actuating mechanism and lift actuating mechanism drive lift activity profiled sheeting descends and contacts with side edge on the constant width shaping flange down fixed profiled sheeting, constant width shaping flange and lift activity profiled sheeting form the shaping passageway, the one end of shaping passageway is the feed end, the other end of shaping passageway is the play board end, the one end that is close to the feed end at lift activity profiled sheeting is equipped with the blanking mouth that communicates with the shaping passageway, this equipment still includes the intermittent type scraping wings that inserts the shaping passageway feed end and intermittent type scraping wings will follow the polytetrafluoroethylene raw materials that the blanking fell down and push away towards the board end and push away And (6) discharging.
Description
Technical Field
The utility model belongs to the technical field of polytetrafluoroethylene panel processing machinery, especially, relate to a polytetrafluoroethylene panel continuous forming equipment and method.
Background
The plate made of polytetrafluoroethylene has the advantages of high temperature resistance, corrosion resistance and the like.
The traditional polytetrafluoroethylene plate is sintered through a customized pouring frame die (because of poor flowability), and the polytetrafluoroethylene plate obtained by sintering can meet the use requirements. For example, the chinese patent discloses a method for manufacturing CN 101708655A-expanded polytetrafluoroethylene board; and CN 108841119A-a polytetrafluoroethylene sheet process. Both of the above two schemes are to use a casting and sintering method to perform the forming process on the plate, and although the above schemes have their respective advantages, the above schemes have the following disadvantages:
due to the fact that the requirements of the terminals of the plates are different, the casting frame molds with different sizes need to be developed, cost is high, and applicability is poor.
Secondly, this conventional molding method is relatively inefficient because the heating press and cooling are required in the casting mold, and the unprocessed and molded plate is required to wait for a long time before and after the molding.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above problems and provides a continuous molding device and method for polytetrafluoroethylene plates, which can solve the technical problems.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
this continuous former of polytetrafluoroethylene panel is including the lower fixed profiled sheeting that is the level setting and the lift activity profiled sheeting that is located fixed profiled sheeting top down and is parallel with fixed profiled sheeting down, the upper surface both sides of fixed profiled sheeting down are connected with the constant width shaping flange and two constant width shaping flanges are parallel to each other through dismantling coupling mechanism respectively, thereby lift activity profiled sheeting is connected with lift actuating mechanism and lift actuating mechanism drive lift activity profiled sheeting descends and contacts with side edge on the constant width shaping flange down fixed profiled sheeting, constant width shaping flange and lift activity profiled sheeting form the shaping passageway, the one end of shaping passageway is the feed end, the other end of shaping passageway is the play board end, the one end that is close to the feed end at lift activity profiled sheeting is equipped with the blanking mouth that communicates with the shaping passageway, this equipment still includes the intermittent type scraping wings that inserts the shaping passageway feed end and intermittent type scraping wings will follow the polytetrafluoroethylene raw materials that the blanking fell down and push away towards the board end and push away And the discharging device also comprises a feeding cooling mechanism, a heating mechanism and a blank plate cooling mechanism, wherein the feeding cooling mechanism is used for cooling the polytetrafluoroethylene raw material at the feeding end, the heating mechanism is used for heating the cooled polytetrafluoroethylene raw material, and the blank plate cooling mechanism is used for cooling the polytetrafluoroethylene blank plate at the discharging end.
In the continuous molding equipment for the polytetrafluoroethylene plates, the feeding cooling mechanism comprises a lower circulating cooling channel arranged at one end of a lower fixed molding plate, an upper circulating cooling channel is arranged at one end of a lifting movable molding plate, and the lower circulating cooling channel and the upper circulating cooling channel are connected in parallel or in series.
In the above continuous molding apparatus for polytetrafluoroethylene sheets, the heating mechanism is a continuous zone heating mechanism.
In the above continuous molding equipment for polytetrafluoroethylene plates, the heating mechanism comprises a plurality of mutually independent lower heating units arranged on the lower fixed molding plate and a plurality of mutually independent upper heating units arranged on the lifting movable molding plate, and one lower heating unit corresponds to one upper heating unit and has equal temperature.
In the continuous molding equipment for the polytetrafluoroethylene plate, the blank plate cooling mechanism comprises a lower blank plate circulating cooling channel arranged at the other end of the lower fixed molding plate and an upper blank plate circulating cooling channel arranged at the other end of the lifting movable molding plate, and the lower blank plate circulating cooling channel and the upper blank plate circulating cooling channel are connected in parallel or in series.
In the above continuous molding equipment for polytetrafluoroethylene plates, the blanking port is arranged along the width direction of the molding channel, and the upper end of the blanking port is connected with the electromagnetic vibration blanking hopper.
In the continuous molding equipment for the polytetrafluoroethylene plates, the intermittent pushing plate is connected with the pushing and translating driving mechanism, the pushing and translating driving mechanism drives the intermittent pushing plate to go deep into the molding channel, and the intermittent pushing plate can seal the lower opening of the blanking port so as to smooth the polytetrafluoroethylene raw material entering the molding channel.
In the continuous molding equipment for the polytetrafluoroethylene plate, the equipment further comprises a thickness fixing device positioned at the side of the plate outlet end, and a plurality of transmission rollers are arranged between the thickness fixing device and the plate outlet end.
In foretell polytetrafluoroethylene panel continuous forming equipment, the device of deciding thick include the fixed plate of deciding thick down that upper surface and fixed profiled sheeting upper surface flushed down, decide thick flange through detachable construction respectively in the upper surface both sides of fixed plate down, still include and decide thick fly leaf and go up and decide thick fly leaf and decide thick lifting drive mechanism and be connected, thereby go up and decide thick fly leaf decline and decide thick flange upper surface contact and carry out thickness suppression to the embryonic plate, be equipped with embryonic plate cooling mechanism on fixed profiled sheeting and/or the last thick fly leaf of deciding down.
The continuous molding method of the polytetrafluoroethylene plate comprises the following steps:
s1, the lifting movable forming plate descends to enable the lower fixed forming plate, the fixed-width forming rib and the lifting movable forming plate to form a forming channel, the blanking port enables the polytetrafluoroethylene raw material to enter the feeding end of the forming channel from top to bottom, and the height of a material pile of the polytetrafluoroethylene raw material exceeds the height of the forming channel;
s2, cooling the stockpile in the step S1 by a feeding cooling mechanism;
s3, pushing the cooled polytetrafluoroethylene raw material out of the plate outlet end by the intermittent pushing plate, heating the polytetrafluoroethylene raw material by the heating mechanism while pushing out, and molding the heated polytetrafluoroethylene raw material by the lower fixed molding plate, the lifting movable molding plate and the fixed-width molding flange to obtain a blank plate;
s4, the blank plate cooling mechanism cools the blank plate output from the plate output end;
and S5, the cooled blank plate enters a thickness fixing device for thickness fixing and cooling to obtain the continuous polytetrafluoroethylene plate.
When pushing materials and extruding, the thickness fixing device does not perform thickness fixing operation.
Compared with the prior art, the continuous molding equipment and the method for the polytetrafluoroethylene plate have the advantages that:
by using the material pushing mode and the mode of cooperatively fixing the forming plate, lifting the movable forming plate and fixing the width forming flange, the continuous plate processing can be realized, the application range is expanded, and the production and processing efficiency is improved.
Secondly, the manufacturing cost is lower.
Drawings
Fig. 1 is a schematic view of the structure of the device provided by the present invention.
Fig. 2 is a schematic view of a top-view structure of the apparatus provided by the present invention.
Fig. 3 is a simplified structural schematic diagram of the apparatus provided by the present invention.
Fig. 4 is a schematic structural diagram of the apparatus provided by the present invention when the thickness is not determined.
Fig. 5 is a schematic diagram of a forming channel structure provided by the present invention.
Fig. 6 is a schematic diagram of a fixed-thickness channel structure provided by the present invention.
In the figure, a conveying roller 01, a frame 02, a lower fixed forming plate 1, a lifting movable forming plate 2, a blanking port 20, an electromagnetic vibration blanking hopper 21, a fixed width forming flange 3, a lifting driving mechanism 4, an intermittent material pushing plate 5, a material pushing translation driving mechanism 50, a side frame 501, a transverse guide rod 502, a sliding seat 503, a translation driving oil cylinder 504, a feeding cooling mechanism 6, a lower circulating cooling channel 60, an upper circulating cooling channel 61, a heating mechanism 7, a lower heating unit 70, an upper heating unit 71, a blank plate cooling mechanism 8, a lower blank plate circulating cooling channel 80, an upper blank plate circulating cooling channel 81, a fixed thickness device 9, a lower fixed thickness fixing plate 90, a fixed thickness flange 91, an upper fixed thickness movable plate 92 and a fixed thickness lifting driving mechanism 93.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 1 and 2, the continuous molding equipment for polytetrafluoroethylene plates comprises a frame 02, wherein a lower fixed molding plate 1 horizontally arranged and a lifting movable molding plate 2 which is positioned above the lower fixed molding plate 1 and is parallel to the lower fixed molding plate 1 are arranged on the frame 02, and the periphery of the lower fixed molding plate 1 is flush with the periphery of the lifting movable molding plate 2.
The lifting movable forming plate 2 is fixed on the frame 02 by bolts.
As shown in fig. 3-5, two sides of the upper surface of the lower fixed forming plate 1 are respectively connected with the fixed-width forming ribs 3 through the detachable connecting mechanism, and the two fixed-width forming ribs 3 are parallel to each other, specifically, the detachable connecting mechanism comprises a plurality of rows of positioning pin holes arranged on two sides of the upper surface of the lower fixed forming plate 1, and the lower surface of the fixed-width forming ribs 3 is connected with a plurality of positioning pins inserted into the positioning pin holes in one row one by one, and the distance between the two fixed-width forming ribs 3 can be adjusted through adjusting the position, so as to be suitable for processing polytetrafluoroethylene plates with different widths.
Of course, the detachable connection mode can also be a connection mode of a bolt and a screw hole.
The lifting movable forming plate 2 is connected with the lifting driving mechanism 4, and the lifting driving mechanism 4 drives the lifting movable forming plate 2 to descend to contact with the upper side of the fixed-width forming rib 3, so that the lower fixed forming plate 1, the fixed-width forming rib 3 and the lifting movable forming plate 2 form a forming channel. The transverse section of the forming channel is of a rectangular structure.
Further, as shown in fig. 2, the lifting driving mechanism 4 includes a plurality of lifting driving cylinders fixed on the top of the frame and distributed in an array, and the lifting driving cylinders are connected to the lifting movable forming plate 2 to drive the lifting movable forming plate 2 to lift.
The number of the lifting driving oil cylinders is 2-16.
As shown in fig. 3-4, one end of the forming channel is a feeding end, the other end of the forming channel is a discharging end, and a blanking opening 20 communicated with the forming channel is disposed at an end of the lifting movable forming plate 2 close to the feeding end, specifically, the blanking opening 20 of the present embodiment is disposed along a width direction of the forming channel, that is, the blanking opening 20 is a rectangular opening, and an electromagnetic vibration blanking hopper 21 is connected to an upper end of the blanking opening 20. The electromagnetic vibration blanking hopper 21 is an electromagnetic vibration blanking hopper with a rectangular structure, and can enable polytetrafluoroethylene raw materials to fall from the electromagnetic vibration blanking hopper and enter the blanking port 20.
During blanking, the height of the stock pile of the polytetrafluoroethylene raw material exceeds the height of the forming channel, namely, the height of the stock pile can extend into the blanking port 20, so that sufficient and uniform blanking is ensured, and the quality of the plate is ensured.
As shown in fig. 1-4, the apparatus further comprises an intermittent pushing plate 5 inserted into the feeding end of the forming channel and the intermittent pushing plate 5 pushes the ptfe material falling from the blanking port 20 out towards the discharging end, wherein the intermittent pushing plate 5 is a flat plate structure with a thickness equal to or slightly less than the height of the forming channel to ensure the pushing efficiency. Further, the intermittent pushing plate 5 is connected with the pushing translation driving mechanism 50, the pushing translation driving mechanism 50 drives the intermittent pushing plate 5 to penetrate into the molding channel, and the intermittent pushing plate 5 can seal the lower opening of the blanking opening 20 so as to smooth the polytetrafluoroethylene raw material entering the molding channel.
Specifically, the pushing material translational driving mechanism 50 includes a side frame 501, a sliding seat 503 slidably connected to the two transverse guide rods, and a translational driving cylinder 504 driving the sliding seat to move, the intermittent pushing material plate 5 is fixed on one side of the sliding seat close to the frame, and the intermittent pushing material plate 5 is located between the two transverse guide rods.
The device is characterized by further comprising a feeding cooling mechanism 6, a heating mechanism 7 and a blank plate cooling mechanism 8, wherein the feeding cooling mechanism 6 is used for cooling the polytetrafluoroethylene raw material at the feeding end, the heating mechanism 7 is used for heating the cooled polytetrafluoroethylene raw material, and the blank plate cooling mechanism 8 is used for cooling the polytetrafluoroethylene blank plate a at the discharging end.
Specifically, the feeding cooling mechanism 6 of the present embodiment includes a lower circulating cooling channel 60 disposed at one end of the lower fixed forming plate 1, and an upper circulating cooling channel 61 disposed at one end of the lifting movable forming plate 2, wherein the lower circulating cooling channel 60 and the upper circulating cooling channel 61 are disposed in parallel or in series. The cooling purpose is achieved by utilizing the circulation of the cooling liquid.
Specifically, the heating mechanism 7 of the present embodiment is a continuous zone heating mechanism. The continuous zone heating mechanism can realize continuous heating of the formed blank plate.
Preferably, the heating mechanism 7 includes a plurality of lower heating units 70 provided on the lower fixed forming plate 1 and independent of each other, and a plurality of upper heating units 71 provided on the lifting movable forming plate 2 and independent of each other, one lower heating unit 70 corresponding to one upper heating unit 71 and having equal temperature.
The lower heating unit 70 has 6 units, the upper heating unit 71 also has 6 units, and each heating unit is an electric heating tube, and the heating temperature is 300-.
Specifically, the blank plate cooling mechanism 8 includes a lower blank plate cooling circulation channel 80 disposed at the other end of the lower fixed forming plate 1, and an upper blank plate cooling circulation channel 81 disposed at the other end of the lifting movable forming plate 2, and the lower blank plate cooling circulation channel 80 and the upper blank plate cooling circulation channel 81 are disposed in parallel or in series. The cooling purpose is achieved by utilizing the circulation of the cooling liquid.
As shown in fig. 3-4 and fig. 6, the device also comprises a thickness fixing device 9 positioned at the side of the plate outlet end, and a plurality of conveying rollers 01 are arranged between the thickness fixing device 9 and the plate outlet end. Specifically, the thickness fixing device 9 of this embodiment includes a lower thickness fixing plate 90 whose upper surface is flush with the upper surface of the lower fixed forming plate 1, the two sides of the upper surface of the lower thickness fixing plate 90 are respectively connected with thickness fixing flanges 91 through detachable mechanisms, the structure of the detachable mechanisms is the same as that of the detachable connecting mechanisms, so as to facilitate processing of blank plates with different widths, the thickness fixing device further includes an upper thickness fixing movable plate 92, the upper thickness fixing movable plate 92 is connected with a thickness fixing lifting driving mechanism 93, the thickness fixing lifting driving mechanism 93 is a plurality of oil cylinders, the upper thickness fixing movable plate 92 descends to contact with the upper surface of the thickness fixing flanges 91, thereby performing thickness pressing on the blank plates, i.e., forming a thickness fixing channel, and a blank plate cooling mechanism 8 is disposed on the lower fixed forming plate 1 and/or the upper thickness fixing movable plate 92.
The blank cooling mechanism 8 includes a lower blank cooling medium passage disposed on the lower fixed forming plate 1 and an upper blank cooling medium passage disposed on the upper fixed-thickness moving plate 92, and cools up and down simultaneously to improve the production efficiency.
The continuous molding method of the polytetrafluoroethylene plate comprises the following steps:
s1, the lifting movable forming plate 2 descends to enable the lower fixed forming plate 1, the fixed-width forming rib 3 and the lifting movable forming plate 2 to form a forming channel, the blanking port enables the polytetrafluoroethylene raw material to enter the feeding end of the forming channel from top to bottom, and the height of a material pile of the polytetrafluoroethylene raw material exceeds the height of the forming channel;
s2, cooling the stockpile in the step S1 by the feeding cooling mechanism 6;
s3, pushing the cooled polytetrafluoroethylene raw material out of the plate outlet end by the intermittent pushing plate 5, heating the polytetrafluoroethylene raw material by the heating mechanism 7 while pushing out, and molding the heated polytetrafluoroethylene raw material by the lower fixed molding plate 1, the lifting movable molding plate 2 and the fixed-width molding flange 3 to obtain a blank plate;
s4, the blank plate cooling mechanism 8 cools the blank plate output from the plate output end;
and S5, the cooled blank plate enters a thickness setting device 9 for thickness setting and cooling to obtain the continuous polytetrafluoroethylene plate.
When the thickness setting device 9 performs thickness setting, the upper thickness setting movable plate 92 presses the blank and the blank having the determined thickness at the same time when the thickness setting device 9 descends for thickness setting each time, that is, after the blank having the undetermined thickness enters the thickness setting device 9 for a certain length, the thickness setting device 9 starts to perform thickness setting, and the intermittent pushing plate 5 stops pushing during thickness setting.
And sawing at a fixed length after the thickness is fixed, thus obtaining a single polytetrafluoroethylene plate.
The rear part of the thickness fixing device 9 is provided with a plurality of transmission rollers so as to be convenient for entering the next station for sawing off the edge and the like.
In addition, the oil cylinder of the embodiment is connected with a hydraulic system. This hydraulic connection method belongs to the prior art, and is not further described in this embodiment.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. Continuous former of polytetrafluoroethylene panel, its characterized in that, this equipment includes the lower fixed profiled sheeting (1) that is the level setting and lies in fixed profiled sheeting (1) top down and lift activity profiled sheeting (2) parallel with fixed profiled sheeting (1) down, be connected with fixed width shaping flange (3) and two fixed width shaping flange (3) are parallel to each other through dismantling coupling mechanism respectively in the upper surface both sides of fixed profiled sheeting (1) down, lift activity profiled sheeting (2) and lift actuating mechanism (4) are connected and lift activity profiled sheeting (2) descend and fixed width shaping flange (3) upside contact thereby fixed profiled sheeting (1), fixed width shaping flange (3) and lift activity profiled sheeting (2) form the shaping passageway down, the one end of shaping passageway is the feed end, the other end of shaping passageway is the slab outlet end, be equipped with blanking mouth (20) with the shaping passageway intercommunication in the one end that goes up and down activity profiled sheeting (2) is close to the feed end, this equipment still including insert the intermittent type scraping wings (5) of shaping passageway feed end and intermittent type scraping wings (5) will follow the polytetrafluoroethylene raw materials that blanking mouth (20) fell down and release toward the board end, still including being used for that sets gradually carrying out refrigerated feeding cooling body (6) to the polytetrafluoroethylene raw materials of feed end, be used for carrying out heated body (7) of heating to the polytetrafluoroethylene raw materials after the cooling to and be used for carrying out refrigerated embryonic plate cooling body (8) to the polytetrafluoroethylene embryonic plate (a) of discharge end.
2. The continuous forming equipment for the polytetrafluoroethylene plate as claimed in claim 1, wherein said feeding and cooling mechanism (6) comprises a lower circulating cooling channel (60) disposed at one end of the lower fixed forming plate (1), an upper circulating cooling channel (61) is disposed at one end of the lifting movable forming plate (2), and said lower circulating cooling channel (60) and said upper circulating cooling channel (61) are disposed in parallel or in series.
3. The continuous polytetrafluoroethylene sheet forming apparatus according to claim 1, wherein said heating means (7) is a continuous zone heating means.
4. The continuous molding apparatus for polytetrafluoroethylene plate according to claim 1 or 3, wherein said heating mechanism (7) comprises a plurality of lower heating units (70) disposed on the lower fixed molding plate (1) and independent of each other, and a plurality of upper heating units (71) disposed on the lifting movable molding plate (2) and independent of each other, one lower heating unit (70) corresponding to one upper heating unit (71) and having equal temperatures.
5. The continuous forming equipment for the polytetrafluoroethylene plate according to claim 1, wherein the blank plate cooling mechanism (8) comprises a lower blank plate circulating cooling channel (80) disposed at the other end of the lower fixed forming plate (1) and an upper blank plate circulating cooling channel (81) disposed at the other end of the lifting movable forming plate (2), and the lower blank plate circulating cooling channel (80) and the upper blank plate circulating cooling channel (81) are disposed in parallel or in series.
6. The continuous polytetrafluoroethylene plate forming apparatus according to claim 1, wherein said blanking opening (20) is disposed along the width direction of the forming channel, and an electromagnetic vibration blanking hopper (21) is connected to the upper end of the blanking opening (20).
7. The continuous molding equipment for the polytetrafluoroethylene plates according to claim 1, wherein the intermittent pushing plate (5) is connected with a pushing translation driving mechanism (50), the pushing translation driving mechanism (50) drives the intermittent pushing plate (5) to go deep into the molding channel, and the intermittent pushing plate (5) can seal the lower opening of the blanking opening (20) so as to smooth the polytetrafluoroethylene raw material entering the molding channel.
8. The continuous polytetrafluoroethylene sheet forming apparatus according to claim 1, further comprising a thickness-determining device (9) disposed at the end of the sheet-discharging end, wherein a plurality of transfer rollers (01) are disposed between the thickness-determining device (9) and the sheet-discharging end.
9. The continuous forming equipment for the polytetrafluoroethylene plates according to claim 8, wherein the thickness fixing device (9) comprises a lower thickness fixing plate (90) with an upper surface flush with the upper surface of the lower fixing and forming plate (1), thickness fixing flanges (91) are respectively connected to two sides of the upper surface of the lower thickness fixing plate (90) through detachable mechanisms, an upper thickness fixing movable plate (92) is further included, the upper thickness fixing movable plate (92) is connected with a thickness fixing lifting driving mechanism (93), the upper thickness fixing movable plate (92) descends to contact with the upper surface of the thickness fixing flanges (91) so as to perform thickness pressing on the blank, and a blank cooling mechanism (8) is arranged on the lower fixing and forming plate (1) and/or the upper thickness fixing movable plate (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022110843.0U CN213260665U (en) | 2020-09-23 | 2020-09-23 | Continuous forming equipment for polytetrafluoroethylene plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022110843.0U CN213260665U (en) | 2020-09-23 | 2020-09-23 | Continuous forming equipment for polytetrafluoroethylene plate |
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| CN213260665U true CN213260665U (en) | 2021-05-25 |
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| CN202022110843.0U Active CN213260665U (en) | 2020-09-23 | 2020-09-23 | Continuous forming equipment for polytetrafluoroethylene plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112060447A (en) * | 2020-09-23 | 2020-12-11 | 安吉宇康机械有限公司 | Continuous forming equipment and method for polytetrafluoroethylene plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112060447A (en) * | 2020-09-23 | 2020-12-11 | 安吉宇康机械有限公司 | Continuous forming equipment and method for polytetrafluoroethylene plate |
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