CN115648674B - Circular cutting type PTFE film production equipment and process thereof - Google Patents
Circular cutting type PTFE film production equipment and process thereof Download PDFInfo
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- CN115648674B CN115648674B CN202211303361.4A CN202211303361A CN115648674B CN 115648674 B CN115648674 B CN 115648674B CN 202211303361 A CN202211303361 A CN 202211303361A CN 115648674 B CN115648674 B CN 115648674B
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Abstract
The invention provides annular cutting type PTFE film production equipment and process, and belongs to the technical field of polytetrafluoroethylene production. The rotary cutting device comprises a frame, an internal supporting type clamping device, a plurality of knife rests, a plurality of flattening mechanisms in one-to-one correspondence with the knife rests and a plurality of winding mechanisms in one-to-one correspondence with the flattening mechanisms, wherein the internal supporting type clamping device fixes a cylindrical polytetrafluoroethylene bar on an output shaft of a motor, the motor is arranged on the frame, the knife rests are circumferentially and uniformly distributed on the outer side of the cylindrical polytetrafluoroethylene bar, the knife rests are respectively controlled by a feeding mechanism, the knife rests comprise a box body, two film guiding rollers for clamping a film are arranged in the box body, a rotary cutting blade is fixedly arranged in the box body, a plurality of ventilation holes are formed in the rotary cutting blade, an air outlet pipe is arranged in the box body and positioned on one side of the rotary cutting blade away from the film, and cold air flow exhausted by the air outlet pipe can pass through the ventilation holes to act on the film, and the rotary cutting device is used for rotary cutting the film. The invention has the advantages of good quality of finished products, high processing efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of polytetrafluoroethylene production, and relates to annular cutting type PTFE film production equipment and process.
Background
PTFE is an English abbreviation of polytetrafluoroethylene, also commonly called as "plastic king", and is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer. Because of the characteristics of high temperature resistance, low friction coefficient, strong acid resistance, strong alkali resistance and the like, the modified polypropylene is widely applied to the electric industry in the fields of aerospace, aviation, electronics, instruments, computers and the like.
The polytetrafluoroethylene has excellent mechanical properties, and the membranous sheet can be obtained by a rotary cutting mode, so that the polytetrafluoroethylene replaces the traditional calendaring mode, has the characteristics of high efficiency, thinner thickness, larger size and the like, and the general process is as follows: the polytetrafluoroethylene suspended fine powder raw material is manufactured into a hollow cylindrical blank through a mould pressing method, the blank is obtained through sintering, then a film with a certain thickness is formed through turning, the internal stress is weakened through a standing mode, but the internal stress always exists, the factors such as unbalance of feeding force in the cutting process, compression deformation of the blank (tiny deformation of polytetrafluoroethylene cylinder materials in the compression process due to good plasticity) and the like are added, the cut film has the conditions of local curling, uneven and the like, the rolling is very unfavorable, the rejection rate of secondary processing can be greatly increased under the condition of poor rolling quality, in addition, in the traditional process (a rotary cutter for rotating the traditional blank and feeding the cutter), the film is contacted with a cutting cutter with a larger area, the local temperature of the film is higher under the condition of higher cutting speed, the deformation of the film is aggravated, the flatness is poor, and even the defects of products such as cracking and incomplete and the like occur.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide annular cutting type PTFE film production equipment, and the technical problem to be solved by the invention is how to improve the processing efficiency.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a ring cutting formula PTFE film production facility, its characterized in that includes frame, internal stay formula clamp, a plurality of knife rest, a plurality of flattening mechanism and a plurality of rolling mechanism with flattening mechanism one-to-one that corresponds with the knife rest, internal stay formula clamp is fixed the output shaft of a motor with tubular polytetrafluoroethylene rod, the motor sets up in the frame, and each knife rest circumference evenly distributed is in the outside of tubular polytetrafluoroethylene rod, and each knife rest is respectively through a feed mechanism control, the knife rest includes a box, be provided with two film guiding rollers with film centre gripping in the box, still fixedly in the box be provided with a rotary-cut blade, a plurality of air vents have been seted up on the rotary-cut blade, be provided with an outlet pipe in the box, the outlet pipe is located one side that the rotary-cut blade kept away from the film, outlet pipe exhaust cold air current can pass the air vent and act on the film.
The film outlet section of the film can realize contact-free tensioning under the action of cold air flow, can be far away from the rotary cutting blade, avoids the influence on flatness caused by overhigh temperature of the film and overlarge temperature difference with other positions, effectively relieves the conditions of bulge, fold and the like at the film outlet position when the film with the thickness smaller than 1mm is rotary-cut, and simultaneously, the air flow can cool the cutter to ensure that the temperature difference between the inside and outside of the bar is not too large.
Adopt central symmetry's mode to set up multiunit rotary-cut mechanism and go on simultaneously, can offset the inhomogeneous of rod atress to a certain extent, can also make the temperature of rod more even, can also reduce to the centre gripping precision requirement of anchor clamps, and corresponding machining efficiency promotes by a wide margin, simultaneously, can also alleviate the roll-up pressure, and the length is bigger, and the roll-up degree of difficulty is bigger, in this scheme, carries out the roll-up with same rod through a plurality of roll-up mechanisms, and the roll-up length of single roll reduces by a wide margin, and the promotion of roll-up precision has positive effect to the reduction of the disability rate of secondary operation.
Further, the flattening mechanism comprises an upper clamping plate and a lower clamping plate, a plurality of sliding grooves are alternately arranged on the upper clamping plate, a pressing roller is connected in a sliding manner in the sliding grooves, the length of the sliding grooves is larger than that of the pressing roller, the length of the pressing roller is matched with the width of the film, the pressing roller is perpendicular to the film outlet direction of the film, two ends of the sliding grooves are respectively provided with an electromagnetic structure, and two ends of the pressing roller are respectively provided with a permanent magnet block; the electromagnetic structure is in a normally-on state and is mutually exclusive with the permanent magnet; the two ends of the press roller are respectively provided with a plurality of first contact pieces, the contact pieces at the same end of the press roller are uniformly distributed on the outer wall surface of the press roller in a circumferential direction, and the lower clamping plate is provided with a second contact piece which can be electrically connected with the first contact piece; when the first contact piece and the second contact piece which are positioned at the same end of the press roller are communicated, the repulsive force between the electromagnetic structure at the end of the press roller and the corresponding permanent magnet block is weakened.
In the scheme, the insulation performance of the polytetrafluoroethylene film is utilized to separate the first contact piece from the second contact piece when the polytetrafluoroethylene film is in a positive rail, in this state, the two ends of the pressing roller are subjected to the same repulsive force action to be in a centering state in the chute, when the film is offset, the first contact piece on one side of the offset is intermittently communicated with the second contact piece, so that the repulsive force of the end of the pressing roller is weakened, the pressing roller moves in the opposite direction of the offset side to correct the film, and the pressing roller can correct the film when the first contact piece is separated from the second contact piece in an intermittent contact gap.
Further, the two knife rests are respectively positioned at the upper side and the lower side of the cylindrical polytetrafluoroethylene bar.
Further, the contact pieces at two ends of the same press roller are distributed in a staggered manner.
The offset distribution may further increase the offset frequency.
Further, the film separates all of the first and second contacts when being in alignment.
Further, the first contact piece is leveled with the circumferential surface of the press roller; and the second contact piece is leveled with the plate surface of the lower clamping plate.
Further, the end parts of the two film guide rollers are respectively and fixedly provided with gears meshed with each other, and the end part of one film guide roller is also fixedly provided with a synchronous wheel which is abutted against the outer wall surface of the cylindrical polytetrafluoroethylene bar.
The film guide roller with the synchronous wheel can keep contact with the outer wall surface of the bar when the rotary cutter blade is fed, so that the linear speed of the film guide roller is almost consistent with that of the bar, and the air blowing type tensioning does not allow the aerated film to be too long, otherwise the tensioning effect is lost.
The circular cutting type PTFE film production process is characterized by comprising the following steps:
1) Preparing materials: mashing polytetrafluoroethylene suspension fine powder raw materials, stirring until uniform mixing, and sieving to obtain polytetrafluoroethylene standby materials;
2) And (3) manufacturing a plate semi-finished product: pressing the polytetrafluoroethylene standby material into a hollow cylindrical bar through a cylindrical die, demolding, and standing to remove internal stress;
3) And (5) forming: sintering and cooling the bar obtained in the step 2) and then forming;
4) And (3) rotary cutting: the bar is clamped and fixed on an output shaft of a motor through an inner support, the inclination angle of the rotary cutting blade is adjusted to the back surface of the rotary cutting blade to press the outer wall surface of the bar, and the bar is started to run for 5-20 minutes, so that the temperature of each part of the bar is uniform; adjusting the rotary cutting blade to the blade part to press the outer wall of the bar, and controlling the feeding speed according to the thickness of the film and the size of the bar to carry out rotary cutting to obtain a traction film; the traction film section sequentially passes through a winding mechanism between two film guide rollers, between an upper clamping plate and a lower clamping plate; after the film traction is completed, a fan corresponding to the air outlet pipe is started, so that the part of the film, which is close to the rotary cutting blade, is far away from the rotary cutting blade.
Further, in the step 4), the film should cover all the second contact pads completely when the film is pulled between the upper clamping plate and the lower clamping plate.
According to the scheme, the bar is preheated by the rotary cutting blade, so that the internal stress of the bar is weakened, the internal and external temperature differences are balanced, the rotary cutting is immediately carried out, the traditional preheating mode cannot be finished on line, clamping is carried out after the preheating is finished, and the stress eliminating effect is weakened in response.
Drawings
Fig. 1 is a schematic structural view of the present rotary cutting apparatus.
Fig. 2 is a schematic structural view of the tool holder.
Fig. 3 is a schematic structural view of the upper and lower clamping plates.
Fig. 4 is a sectional view of the upper and lower clamping plates.
Fig. 5 is a partial cross-sectional view of the upper clamp plate.
Fig. 6 is a schematic circuit diagram of an electromagnetic structure.
In the figure, 1, an internal bracing type clamping device; 2. a flattening mechanism; 21. an upper clamping plate; 22. a lower clamping plate; 23. a chute; 24. a press roller; 25. permanent magnet blocks; 26. an electromagnetic structure; 27. a first contact; 28. a second contact; 3. a winding mechanism; 41. a case; 42. a film guide roller; 43. a rotary cutting blade; 44. a vent hole; 45. and (5) an air outlet pipe.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-5, after omitting part of the components of the traditional rotary cutting equipment, the part of the scheme, which is different from the prior art, comprises a frame, an inner supporting type clamping 1, a plurality of knife rests, a plurality of flattening mechanisms 2 corresponding to the knife rests one by one and a plurality of winding mechanisms 3 corresponding to the flattening mechanisms 2 one by one, wherein the inner supporting type clamping 1 fixes a cylindrical polytetrafluoroethylene bar on an output shaft of a motor, the motor is arranged on the frame, the knife rests are circumferentially and uniformly distributed on the outer side of the cylindrical polytetrafluoroethylene bar, each knife rest is controlled by a feeding mechanism, each knife rest comprises a box 41, two film guide rollers 42 for clamping a film are arranged in the box 41, a rotary cutting blade 43 is fixedly arranged in the box 41, a plurality of ventilation holes 44 are formed in the rotary cutting blade 43, an air outlet pipe 45 is arranged in the box 41, the air outlet pipe 45 is positioned on one side of the rotary cutting blade 43 away from the film, and cold air flow discharged by the air outlet pipe 45 can pass through the ventilation holes 44 to act on the film.
The film outlet section of the film can realize contact-free tensioning under the action of cold air flow, can be far away from the rotary cutting blade 43, avoids the influence on flatness caused by overhigh temperature of the film and overlarge temperature difference with other positions, effectively relieves the conditions of bulge, wrinkles and the like at the film outlet position when the film with the thickness of less than 1mm is rotary-cut, and simultaneously, the air flow can cool the cutter to ensure that the temperature difference between the inside and outside of the bar is not too large.
Adopt central symmetry's mode to set up multiunit rotary-cut mechanism and go on simultaneously, can offset the inhomogeneous of rod atress to a certain extent, can also make the temperature of rod more even, can also reduce to the centre gripping precision requirement of anchor clamps, and corresponding machining efficiency promotes by a wide margin, simultaneously, can also alleviate the roll-up pressure, and the length is bigger, and the roll-up degree of difficulty is bigger, in this scheme, carries out the roll-up with same rod through a plurality of roll-up mechanisms, and the roll-up length of single roll reduces by a wide margin, and the promotion of roll-up precision has positive effect to the reduction of the disability rate of secondary operation.
The thinning structure of rotary cutting feeding, cutter installation and the like is common knowledge in industry, and the scheme is not detailed.
The flattening mechanism 2 comprises an upper clamping plate 21 and a lower clamping plate 22, a plurality of sliding grooves 23 are alternately arranged on the upper clamping plate 21, a pressing roller 24 is connected in a sliding manner in the sliding grooves 23, the length of the sliding grooves 23 is larger than that of the pressing roller 24, the length of the pressing roller 24 is matched with the width of a film, the pressing roller 24 is perpendicular to the film outlet direction of the film, two ends of the sliding grooves 23 are respectively provided with an electromagnetic structure 26, and two ends of the pressing roller 24 are respectively provided with a permanent magnet block 25; the electromagnetic structure 26 is in a normally-energized state and is mutually exclusive with the permanent magnet 25; the two ends of the press roller 24 are provided with a plurality of first contact pieces 27, the first contact pieces 27 at the same end of the press roller 24 are circumferentially and uniformly distributed on the outer wall surface of the press roller 24, and the lower clamping plate 22 is provided with a second contact piece 28 which can be electrically connected with the first contact pieces 27; when the first contact 27 and the second contact 28 at the same end of the pressing roller 24 are connected, the repulsive force between the electromagnetic structure 26 at the end of the pressing roller 24 and the corresponding permanent magnet 25 is weakened.
In this scheme, the insulation performance of the polytetrafluoroethylene film is utilized to separate the first contact sheet 27 and the second contact sheet 28 when the polytetrafluoroethylene film is in a positive track, in this state, the two ends of the press roll 24 are subjected to the same repulsive force to be in a centered state in the chute 23, when the film is offset, the first contact sheet 27 on one side of the offset is intermittently connected with the second contact sheet 28, so that the repulsive force of the end of the press roll 24 is weakened, the press roll 24 moves in the opposite direction of the offset side to correct and guide the film, and in the gap of intermittent contact, the press roll 24 can correct when the first contact sheet 27 is separated from the second contact sheet 28, therefore, the correction and guide are frequently and intermittently performed, the press roll 24 effectively corrects the film while compressing and flattening the film, greatly improves the rolling quality, reduces the diameter of a single roll, has better rolling appearance, and particularly has positive influence on the rejection rate of secondary processing of the film.
As shown in fig. 6, the power supply is a common power supply, each electromagnetic structure 26 corresponds to one circuit unit, each circuit unit is connected in parallel, in fact, there are other ways, the scheme only provides one of the more concise processing ways, and the purpose is to make use of the insulation performance of polytetrafluoroethylene to make the off-tracking position realize the electrical contact between the first contact piece 27 and the second contact piece 28, so that the magnetic force of the electromagnetic structure 26 at the corresponding position is weakened, the pressing roller 24 moves in the opposite direction of the off-tracking side under the repulsive force action of the other side, in addition, because polytetrafluoroethylene has a lower friction coefficient, the frequent action can not cause violent pulling and wrinkling of the film, but the small-amplitude and high-frequency deviation correction can have better effect on the guiding and pulling of the film. The connection of the first contact 27 on the press roller 24 and the circuit adopts an electric brush mode, so that the press roller 24 can rotate and slide.
The two knife rests are respectively positioned at the upper side and the lower side of the cylindrical polytetrafluoroethylene bar.
The first contact sheets 27 at the two ends of the same press roller 24 are distributed in a staggered manner, and the staggered distribution can further increase the deviation correcting frequency.
The film keeps all of contact one 27 and contact two 28 apart during tracking.
The first contact piece 27 is leveled with the peripheral surface of the pressing roller 24; the second contact 28 is flush with the lower plate 22.
The end parts of the two film guide rollers 42 are respectively fixedly provided with gears meshed with each other, and the end part of one film guide roller 42 is also fixedly provided with a synchronous wheel abutted against the outer wall surface of the cylindrical polytetrafluoroethylene bar.
The film guiding roller 42 provided with the synchronizing wheel can keep contact with the outer wall surface of the bar when the rotary cutting blade 43 is fed, so that the linear speed of the film guiding roller 42 is almost consistent with that of the bar, and the air blowing type tensioning does not allow the aerated film to be too long, otherwise the tensioning effect is lost.
The production process of the circular cutting type PTFE film comprises the following steps:
1. preparing materials: mashing polytetrafluoroethylene suspension fine powder raw materials, stirring until uniform mixing, and sieving to obtain polytetrafluoroethylene standby materials;
2. and (3) manufacturing a plate semi-finished product: pressing the polytetrafluoroethylene standby material into a hollow cylindrical bar through a cylindrical die, demolding, and standing to remove internal stress;
3. and (3) forming: sintering and cooling the bar obtained in the step 2, and forming;
4. rotary cutting: the bar is clamped and fixed on an output shaft of a motor through an inner support, the inclination angle of a rotary cutting blade 43 is adjusted to the back surface of the rotary cutting blade 43 to press the outer wall surface of the bar, and the bar is started to run for 5-20 minutes, so that the temperature of each part of the bar is uniform; the rotary cutting blade 43 is adjusted again until the blade part is pressed against the outer wall of the bar, and the feeding speed is controlled according to the thickness of the film and the size of the bar to carry out rotary cutting to obtain a traction film; the traction film section sequentially passes through a winding mechanism 3 between two film guide rollers 42, between an upper clamping plate 21 and a lower clamping plate 22; after the film traction is completed, a fan corresponding to the air outlet pipe 45 is started, so that the part of the film close to the rotary cutting blade 43 is far away from the rotary cutting blade 43.
In step 4, the membrane should completely cover all of the contact two 28 as it is pulled between the upper and lower jaws 21, 22.
The scheme adopts the rotary cutting blade 43 to preheat the bar, so that the internal stress of the bar is weakened, the internal and external temperature differences are balanced, the rotary cutting is immediately carried out, the traditional preheating mode cannot be finished on line, clamping is carried out after the preheating is finished, and the stress eliminating effect is weakened in response. The rotary cutting of polytetrafluoroethylene is an existing means in the industry, and the key of the scheme is that corresponding equipment is utilized, and the scheme provides a new heating means.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. The annular cutting type PTFE film production equipment is characterized by comprising a frame, an inner supporting type clamping device (1), a plurality of knife rests, a plurality of flattening mechanisms (2) which are in one-to-one correspondence with the knife rests and a plurality of winding mechanisms (3) which are in one-to-one correspondence with the flattening mechanisms (2), wherein the inner supporting type clamping device (1) is used for fixing a cylindrical polytetrafluoroethylene bar on an output shaft of a motor, the motor is arranged on the frame, the knife rests are circumferentially and uniformly distributed on the outer side of the cylindrical polytetrafluoroethylene bar, the knife rests are respectively controlled by a feeding mechanism, the knife rests comprise a box body (41), two film guide rollers (42) which clamp a film are arranged in the box body (41), a rotary cutting blade (43) is fixedly arranged in the box body (41), a plurality of vent holes (44) are formed in the rotary cutting blade (43), an air outlet pipe (45) is arranged in the box body (41), the air outlet pipe (45) is positioned at one side of the rotary cutting blade (43) which is far away from the film, and cold air flow discharged by the air outlet pipe (45) can pass through the vent holes (44) to act on the film;
the flattening mechanism (2) comprises an upper clamping plate (21) and a lower clamping plate (22), wherein a plurality of sliding grooves (23) are alternately arranged on the upper clamping plate (21), a pressing roller (24) is connected in a sliding manner in the sliding grooves (23), the length of the sliding grooves (23) is larger than that of the pressing roller (24), the length of the pressing roller (24) is matched with the width of a film, the pressing roller (24) is perpendicular to the film outlet direction of the film, two ends of the sliding grooves (23) are respectively provided with an electromagnetic structure (26), and two ends of the pressing roller (24) are respectively provided with a permanent magnet block (25); the electromagnetic structure (26) is in a normal power-on state and is mutually exclusive with the permanent magnet block (25); the two ends of the press roller (24) are provided with a plurality of first contact pieces (27), the first contact pieces (27) at the same end of the press roller (24) are circumferentially and uniformly distributed on the outer wall surface of the press roller (24), and the lower clamping plate (22) is provided with a second contact piece (28) which can be electrically connected with the first contact piece (27); when the first contact (27) and the second contact (28) which are positioned at the same end of the pressing roller (24) are connected, the repulsive force between the electromagnetic structure (26) at the end of the pressing roller (24) and the corresponding permanent magnet block (25) is weakened.
2. The apparatus for producing a circular cut type PTFE film according to claim 1, wherein two knife holders are respectively arranged on the upper side and the lower side of the cylindrical polytetrafluoroethylene rod.
3. The apparatus for producing a circular cut type PTFE film according to claim 1, wherein the contact pieces (27) at both ends of the same pressing roller (24) are arranged in a staggered manner.
4. The apparatus of claim 1 wherein the film is tracked such that all of the first (27) and second (28) contacts are separated.
5. The apparatus for producing a circular cut type PTFE film according to claim 1, wherein said first contact piece (27) is leveled with the circumferential surface of the pressing roller (24); and the second contact (28) is leveled with the plate surface of the lower clamping plate (22).
6. The circular cutting type PTFE film production device according to claim 1, wherein the end parts of the two film guiding rollers (42) are respectively fixedly provided with gears meshed with each other, and the end part of one film guiding roller (42) is also fixedly provided with a synchronous wheel abutted against the outer wall surface of the cylindrical polytetrafluoroethylene bar.
7. A process for manufacturing a circular cut PTFE film using the apparatus of any one of claims 2 to 6, comprising the steps of:
1) Preparing materials: mashing polytetrafluoroethylene suspension fine powder raw materials, stirring until uniform mixing, and sieving to obtain polytetrafluoroethylene standby materials;
2) And (3) manufacturing a plate semi-finished product: pressing the polytetrafluoroethylene standby material into a hollow cylindrical bar through a cylindrical die, demolding, and standing to remove internal stress;
3) And (5) forming: sintering and cooling the bar material obtained in the step (2) and then forming;
4) And (3) rotary cutting: the bar is clamped and fixed on an output shaft of a motor through an internal support, the inclination angle of a rotary cutter blade (43) is adjusted to the back surface of the rotary cutter blade (43) to press the outer wall surface of the bar, and the bar is started to run for 5-20 minutes, so that the temperature of each part of the bar is uniform; the rotary cutting blade (43) is adjusted again until the blade part abuts against the outer wall of the bar, and the feeding speed is controlled according to the thickness of the film and the size of the bar to carry out rotary cutting to obtain a traction film; the traction film section sequentially passes through a winding mechanism (3) between two film guide rollers (42), between an upper clamping plate (21) and a lower clamping plate (22); after the film traction is completed, a fan corresponding to the air outlet pipe (45) is started, so that the part of the film, which is close to the rotary cutting blade (43), is far away from the rotary cutting blade (43).
8. The process according to claim 7, wherein in step 4), the film is completely covered with the second contact sheet (28) when the film is pulled between the upper clamping plate (21) and the lower clamping plate (22).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87100385A (en) * | 1987-01-20 | 1987-08-19 | 武汉重型机床研究所 | Digital control film rotary cutter |
| CN101462393A (en) * | 2007-12-19 | 2009-06-24 | 于滨 | Method for preparing overlay film plastic sheet |
| CN103144324B (en) * | 2013-03-18 | 2015-06-24 | 江苏泰氟隆科技有限公司 | Ultrathin wide teflon turning film and manufacturing technology thereof |
| CN103707529B (en) * | 2013-12-27 | 2015-12-16 | 天津市天塑滨海氟塑料制品有限公司 | The numerical control sizing winding device of production wide cut PTFE base material film and manufacture method |
| CN208747274U (en) * | 2018-06-29 | 2019-04-16 | 广东仕诚塑料机械有限公司 | A kind of chopper device of thin film winder |
| CN111232716A (en) * | 2020-03-19 | 2020-06-05 | 上海市凌桥环保设备厂有限公司 | Polytetrafluoroethylene film fiberizer |
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Denomination of invention: Ring cut PTFE film production equipment and its process Effective date of registration: 20230922 Granted publication date: 20230428 Pledgee: Industrial and Commercial Bank of China Limited Zhejiang Yangtze River Delta integration demonstration zone sub branch Pledgor: Jiashan Yide longfluorine Technology Co.,Ltd. Registration number: Y2023980058551 |