CN110480996B - Two-way accurate stretching device of film - Google Patents
Two-way accurate stretching device of film Download PDFInfo
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- CN110480996B CN110480996B CN201910316782.2A CN201910316782A CN110480996B CN 110480996 B CN110480996 B CN 110480996B CN 201910316782 A CN201910316782 A CN 201910316782A CN 110480996 B CN110480996 B CN 110480996B
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- stretching mechanism
- stretching
- driving motor
- pressing
- strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/146—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly transversely to the direction of feed and then parallel thereto
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention provides a film bidirectional accurate stretching device which comprises a first driving motor, a transverse stretching mechanism, a longitudinal stretching mechanism and a tension sensor, wherein the transverse stretching mechanism and the longitudinal stretching mechanism are horizontally and vertically arranged, the transverse stretching mechanism and the longitudinal stretching mechanism respectively comprise a strip pressing stretching mechanism and a plurality of point pressing stretching mechanisms, and the point pressing stretching mechanisms are connected on the strip pressing stretching mechanisms in a relatively sliding manner; and the strip pressing and stretching mechanism of the transverse stretching mechanism and the point pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act, and the point pressing and stretching mechanism of the transverse stretching mechanism and the strip pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act. The deformation defects of wide two ends and narrow middle of the stretched film can be avoided in the one-way stretching operation, and the overall shape of the stretched film is ensured preliminarily; the stretching effect is ensured, and the stretching thinness is uniform; the defect of uneven thickness of a stretching point caused by the fact that point pressing fixation is adopted for fixed-point stretching in the prior art is overcome.
Description
Technical Field
The invention relates to stretching processing of a high polymer film, in particular to a bidirectional precise film stretching device.
Background
The final properties of polymeric films are strongly dependent on the processing method and process conditions. The same polymer and different processing methods such as film blowing, tape casting and stretching can produce films with different properties. Stretched films such as biaxially oriented polypropylene (BOPP) and polyester (BOPET) have the characteristics of high strength, strong light transmission, good air and moisture barrier properties, excellent dimensional stability and the like, and thus stretching becomes the mainstream development direction of high-performance film processing. However, the film stretching industry still has major problems, such as Polyethylene (PE) which is the most important and abundant raw material of polymer film, and there is no mature biaxial stretching technology (BOPE) in the world. In the field of energy materials, how to improve the surface charge density of a capacitor film and how to prepare a high-efficiency and safe microporous battery film and the like are all problems which are urgently needed to be solved by the industry.
The scientific problem of film stretching is actually the back of the industrial problem and can be summarized as the following: (1) in the prior art, point pressing fixation is adopted for fixed-point stretching, so that the stretching points have uneven thinness; (2) in the operation of unidirectional stretching, the stretched film is easy to deform with wide two ends and narrow middle; (3) nonlinear rheology of structural fluids in high speed stretching; (4) stretching and flowing to induce the conformation order and crystallization of the macromolecule; (5) crystal deformation, orientation and destruction in post-stretching. The solution of the problems needs a great deal of early exploration, and obviously, the research of an experimental device for simulating the stretching processing of the industrial film has important significance for researching the physical problems in the stretching processing of the high-molecular film and preparing the high-performance film.
In view of the above, a stretching apparatus simulating a stretching process in the film industry is required to have the following characteristics: 1. the stretching mode can simulate all film stretching processing methods in industry: unidirectional limited, unidirectional unlimited, bidirectional synchronous, bidirectional asynchronous stretching; 2. stress strain information in two directions can be collected in the stretching process, and the action of an external field and the response of a sample are tracked.
Disclosure of Invention
The invention aims to provide a bidirectional precise film stretching device. The stretching device avoids the defect of uneven stretching point thinness existing in the prior art that the fixed point stretching is carried out by adopting point pressing fixation, simultaneously, the deformation defects of wide two ends and narrow middle of the stretched film are avoided by the sequential matching action of strip pressing and point pressing in the operation of single direction stretching,
the technical scheme adopted by the invention is as follows:
a film bidirectional accurate stretching device comprises a first driving motor, a transverse stretching mechanism, a longitudinal stretching mechanism and a tension sensor, wherein the transverse stretching mechanism and the longitudinal stretching mechanism are respectively connected with the output end of the first driving motor, and the tension sensor is arranged on the transverse stretching mechanism and the longitudinal stretching mechanism; the transverse stretching mechanism and the longitudinal stretching mechanism are horizontally and vertically arranged, wherein the transverse stretching mechanism and the longitudinal stretching mechanism respectively comprise a strip pressing stretching mechanism and a plurality of point pressing stretching mechanisms, and the point pressing stretching mechanisms are connected with the strip pressing stretching mechanisms in a relatively sliding manner; and the strip pressing and stretching mechanism of the transverse stretching mechanism and the point pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act, and the point pressing and stretching mechanism of the transverse stretching mechanism and the strip pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act.
Further, the strip pressing and stretching mechanism comprises a slidable base, a fixing plate is vertically and fixedly arranged on the base, a second driving motor is fixedly arranged at the top end of the fixing plate, and a strip pressing plate is fixedly arranged on an output shaft of the second driving motor.
Further, the base is connected with an output shaft of the first driving motor, and first concave-convex strips are uniformly distributed on the base.
Further, second concave-convex strips are uniformly distributed at the bottom of the strip pressing plate; and when the strip pressing plate is attached to the base, the second concave-convex strip is meshed with the first concave-convex strip.
Furthermore, the strip pressing plate is in a frame shape or a strip shape.
Furthermore, point pressure stretching mechanism includes take-up housing, spliced pole, third driving motor, fourth driving motor and sucking disc, the gliding strip clamp plate of locating of take-up housing, the spliced pole is fixed locate on the take-up housing, the third driving motor level is fixed locates the connecting column top, the fixed output of locating third driving motor of fourth driving motor, the fixed output of locating fourth driving motor of sucking disc.
Furthermore, the tension sensor is fixedly arranged at the top of the connecting column.
Compared with a common stretching device, the invention has the following innovation points:
1. in the stretching process, strip pressing and point pressing are realized, wherein the combination of the strip pressing and the point pressing can ensure the stretching effect and ensure the uniform stretching thinness; the defect of uneven thickness of a stretching point caused by the fact that point pressing fixation is adopted for fixed-point stretching in the prior art is overcome.
2. In the stretching process, the strip pressing and the point pressing are sequentially matched to act, so that the deformation defects of wide two ends and narrow middle of the stretched film can be avoided in the one-way stretching operation, and the integral shape of the stretched film is preliminarily ensured.
3. The invention has continuously adjustable stretching speed and stretching ratio and accurate control.
4. The invention can accurately acquire the tension data in two directions in real time.
5. The invention can stretch the film aiming at different polymer film materials, has universality for disclosing the scientific problem of polymer film stretching, and has wide application range.
6. The rheology and mechanical properties are coupled with the structure (orientation degree, crystallinity and lamella growth period) and the properties (optical property and mechanical property) of the film, so that the relation of processing parameters-film structure-film property can be established, and conditions are provided for the exploration of the production process of the high-performance film.
7. The application prospect of the invention is as follows: 1) the device is combined with a wide-angle X-ray scattering device and a small-angle X-ray scattering device to systematically research basic scientific problems in the stretching process of the polymer film; 2) the method simulates the stretching processing conditions of the industrial film, reveals the relationship between the structure evolution behavior and the processing performance and the final use performance in the stretching processing of the film, and has a revelation effect on the industrial processing of the film.
Drawings
Fig. 1 is a schematic structural view of a transverse stretching mechanism 2/longitudinal stretching mechanism 3 (a strip pressing plate is attached to a base).
Fig. 2 is a side view of the structure of fig. 1 (with the strip press attached to the base).
Fig. 3 is a schematic structural diagram of the transverse stretching mechanism 2/longitudinal stretching mechanism 3 (the strip pressing plate is separated from the base).
Fig. 4 is a side view of the structure of fig. 3 (with the bar press plate separated from the base).
Fig. 5 is a schematic structural view of the strip pressing and stretching mechanism 5 of the present invention.
Fig. 6 is a schematic structural view of the point-pressing stretching mechanism 6 according to the present invention.
FIG. 7 is a diagram illustrating the initial state of the transverse stretching according to the present invention.
FIG. 8 is a diagram illustrating the transverse stretching end state of the present invention.
FIG. 9 is a view showing an initial state of longitudinal stretching according to the present invention.
FIG. 10 is a view showing a state where longitudinal stretching is completed according to the present invention.
The automatic film-pressing and stretching device comprises a first driving motor 1, a transverse stretching mechanism 2, a longitudinal stretching mechanism 3, a tension sensor 4, a pressing and stretching mechanism 5, a base 51, a first concave-convex strip 511, a first concave-convex strip 52, a fixing plate 53, a second driving motor 54, a pressing plate 541, a second concave-convex strip 541, a point-pressing and stretching mechanism 6, a slider seat 61, a connecting column 62, a third driving motor 63, a fourth driving motor 64, a sucking disc 65 and a film 7.
Detailed Description
The invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 10, a bidirectional precise film stretching device includes a first driving motor 1, a transverse stretching mechanism 2, a longitudinal stretching mechanism 3, and a tension sensor 4, wherein the transverse stretching mechanism 2 and the longitudinal stretching mechanism 3 are respectively connected to an output end of the first driving motor 1, and the tension sensor 4 is disposed on the transverse stretching mechanism 2 and the longitudinal stretching mechanism 3; the transverse stretching mechanism 2 and the longitudinal stretching mechanism 3 are horizontally and vertically arranged, wherein the transverse stretching mechanism 2 and the longitudinal stretching mechanism 3 respectively comprise a strip pressing stretching mechanism 5 and a plurality of point pressing stretching mechanisms 6, and the point pressing stretching mechanisms 6 are connected with the strip pressing stretching mechanism 5 in a relatively sliding manner; and the strip pressing and stretching mechanism 5 of the transverse stretching mechanism 2 and the point pressing and stretching mechanism 6 of the longitudinal stretching mechanism 3 correspondingly and simultaneously act, and the point pressing and stretching mechanism 6 of the transverse stretching mechanism 2 and the strip pressing and stretching mechanism 5 of the longitudinal stretching mechanism 3 correspondingly and simultaneously act.
Two longitudinal edges of the film 7 are pressed and fixed through a strip pressing and stretching mechanism 5 of a transverse stretching mechanism 2, and two transverse edges of the film 7 are adsorbed and fixed through a point pressing and stretching mechanism 6 of a longitudinal stretching mechanism 3; when stretching is carried out in the transverse direction, the point pressing stretching mechanism 6 of the longitudinal stretching mechanism 3 can slide along the strip pressing stretching mechanism 5 of the longitudinal stretching mechanism 3, and the film 7 can be stretched in the transverse direction;
replacing two transverse edges of the transversely stretched film 7 with a strip pressing and stretching mechanism 5 of a longitudinal stretching mechanism 3 for pressing and fixing, and replacing two longitudinal edges of the film 7 with a point pressing and stretching mechanism 6 of a transverse stretching mechanism 2 for adsorbing and fixing; when the film is longitudinally stretched, the point pressing and stretching mechanism 6 of the transverse stretching mechanism 2 can slide along the strip pressing and stretching mechanism 5 of the transverse stretching mechanism 2, so that the film 7 can be longitudinally stretched; thereby achieving biaxial stretching of the film 7.
Specifically, the strip pressing and stretching mechanism 5 comprises a slidable base 51, a fixing plate 52 is vertically and fixedly arranged on the base 51, a second driving motor 53 is fixedly arranged at the top end of the fixing plate 52, and a strip pressing plate 54 is fixedly arranged on an output shaft of the second driving motor 53; and the strip of pressure plate 54 may be attached to the base 51. The second driving motor 53 can control the strip pressing plate 54 to be attached to the base 51, so that the strip pressing of the film 7 is realized, the tensile force applied to the film 7 is uniform when the film is stretched, and the obtained thickness is uniform.
The base 51 is connected with an output shaft of the first driving motor 1, so that the position change of the bar pressing and stretching mechanism 5 can be realized through the first driving motor 1, and the positioning and stretching effects are realized.
The base 51 is uniformly provided with first concave-convex strips 511, and the bottom of the strip pressing plate 54 is uniformly provided with second concave-convex strips 541; and when the strip pressing plate 54 is attached to the base 51, the second concave-convex strip 541 is engaged with the first concave-convex strip 511; the friction force between the strip pressing plate 54 and the base 51 is further improved, the positioning stability of the film 7 is ensured, the film 7 is prevented from sliding in a positioning manner in the stretching process, and the stretching precision is improved.
The strip pressing plate 54 is in a frame shape or a strip shape; the contact area, i.e., the tension point, of the strip pressing plate 54 with the film 7 can be increased, and uniform stretching of the film 7 can be achieved.
Specifically, the point-pressing stretching mechanism 6 includes a slider seat 61, a connecting column 62, a third driving motor 63, a fourth driving motor 64 and a suction cup 65, the slider seat 61 is slidably disposed on the strip pressing plate 54, the connecting column 62 is fixedly disposed on the slider seat 61, the third driving motor 63 is horizontally and fixedly disposed at the top of the connecting column 62, the fourth driving motor 64 is fixedly disposed at the output end of the third driving motor 63, and the suction cup 65 is fixedly disposed at the output end of the fourth driving motor 64.
The up-and-down motion of the suction cup 65 can be controlled by the third driving motor 63 and the fourth driving motor 64: the suction cup 65 rises, away from the film 7; the suction cup 65 descends to suck the thin film 7, thereby realizing point pressing on the thin film 7; when strip pressing stretching is conducted on the film 7 in one direction, point pressing is adopted in the other direction, deformation of the film 7 in the stretching process is avoided, and the stretching effect of the film 7 is guaranteed.
The tension sensor 4 is fixedly arranged at the top of the connecting column 62; therefore, the tension data can be accurately acquired according to the actions of the strip pressing and stretching mechanism 5 and the point pressing and stretching mechanism 6, and the tension change in two directions can be tracked.
The stretching device can be matched with a transmission device and the prior technical equipment such as a preheating furnace, a stretching furnace, a hot air circulating system and the like to carry out actual operation; meanwhile, a control system, such as a Labview software control system, is matched to integrate the control of each driving motor (the first driving motor 1, the second driving motor 53, the third driving motor 63 and the fourth driving motor 64) and the signal acquisition of the tension sensor 4, synchronous control and data acquisition can be performed, the tension sensor 4 uses an NI-USB6008 data acquisition card produced by American national instruments, and the sampling rate is 10ks/s, while the sampling rate of 1ks/s is generally adopted in the experimental process, so that the tension acquisition time resolution reaches 1 millisecond, and the data processing complexity caused by excessive data points is also avoided.
When the stretching device is used specifically, the following is specific:
(1) firstly, connecting a first driving motor 1, a second driving motor 53, a third driving motor 63, a fourth driving motor 64 and a tension sensor 4 with a stretching speed control system, and controlling the first driving motor 1 to adjust a transverse stretching mechanism 2 and a longitudinal stretching mechanism 3 to proper positions through the control system;
(2) according to the initial position of the stretching device (the initial space position between the transverse stretching mechanism 2 and the longitudinal stretching mechanism 3), at this time, the distance between the two longitudinal stretching mechanisms 3 is equal to the width of the transverse stretching mechanism 2, and the transverse side length of the film 7 is larger than the distance between the two transverse stretching mechanisms 2; cutting the film 7 into a rectangular sample with a proper size;
(3) the second driving motor 53 of the transverse stretching mechanism 2 is controlled by the control system, the strip pressing plate 54 of the transverse stretching mechanism 2 is lowered, the strip pressing plate 54 is attached to the base 51, and meanwhile, the longitudinal corresponding edge of the film 7 is tightly pressed and fixed in the strip pressing plate 54;
the third driving motor 63 and the fourth driving motor 64 of the longitudinal stretching mechanism 3 are controlled by the control system, so that the corresponding suckers 65 are fixedly adsorbed on the two transverse edges of the film 7; as shown in fig. 7;
(4) the control system controls the first driving motor 1 of the transverse stretching mechanism 2 to stretch the film 7 in the transverse direction, and the suckers 65 adsorbed on the transverse edge of the film 7 slide along the strip pressing plate 54 of the longitudinal stretching mechanism 3 at the same time until the transverse stretching of the film 7 is finished; as shown in fig. 8;
(5) controlling the first driving motor 1 and the third driving motor 63 of the longitudinal stretching mechanism 3 through the control system to enable the strip pressing plate 54 of the longitudinal stretching mechanism 3 to be close to the transverse edge of the film 7; then, the control system controls a second driving motor 53 of the longitudinal stretching mechanism 3 to lower a strip pressing plate 54 of the longitudinal stretching mechanism 3, so that the strip pressing plate 54 is attached to the base 51; at the same time, the corresponding transverse edges of the film 7 are pressed and fixed therein; the fourth driving motor 64 of the longitudinal stretching mechanism 3 is controlled by the control system, so that the corresponding suction cups 65 are separated from the two transverse edges of the film 7;
the fourth driving motor 64 of the transverse stretching mechanism 2 is controlled by the control system, so that the corresponding sucking discs 65 are fixedly adsorbed on the two longitudinal edges of the film 7; meanwhile, the control system controls the second driving motor 53 of the transverse stretching mechanism 2 to lift the strip pressing plate 54 of the transverse stretching mechanism 2, so that the strip pressing plate 54 is separated from the base 51; as shown in fig. 9;
(6) the control system controls the first driving motor 1 of the longitudinal stretching mechanism 3 to stretch the film 7 in the longitudinal direction, and the sucking discs 65 adsorbed on the film 7 in the longitudinal direction simultaneously slide along the strip pressing plates 54 of the transverse stretching mechanism 2 until the longitudinal stretching of the film 7 is finished; as shown in fig. 10.
When the device is matched with the prior transmission device and the prior technical equipment such as a preheating furnace, a stretching furnace, a hot air circulating system and the like to carry out actual operation, the stretching device can be arranged on the transmission device and is arranged between the preheating furnace and the stretching furnace; setting the temperature of a preheating furnace and a stretching furnace, moving the stretching device to a preheating station, moving the stretching device to the stretching furnace when the temperature is preheated to 110 ℃, stretching the film 7 when the temperature of the film 7 reaches the stretching temperature after 2min, and recording the force change in the stretching process by a tension sensor 4. After the film 7 was stretched, the stretching apparatus was moved to a preheating furnace and heat-set for 10min at a temperature of 125 ℃. The influence of the external field parameters on the film structure can be obtained by combining the tensile force and the sample form.
Parts of the invention not described in detail are well known in the art.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (6)
1. A film bidirectional accurate stretching device comprises a first driving motor, a transverse stretching mechanism, a longitudinal stretching mechanism and a tension sensor, wherein the transverse stretching mechanism and the longitudinal stretching mechanism are respectively connected with the output end of the first driving motor, and the tension sensor is arranged on the transverse stretching mechanism and the longitudinal stretching mechanism; the method is characterized in that: the transverse stretching mechanism and the longitudinal stretching mechanism are horizontally and vertically arranged, wherein the transverse stretching mechanism and the longitudinal stretching mechanism respectively comprise a strip pressing stretching mechanism and a plurality of point pressing stretching mechanisms, and the point pressing stretching mechanisms are connected with the strip pressing stretching mechanisms in a relatively sliding manner; the strip pressing and stretching mechanism of the transverse stretching mechanism and the point pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act, and the point pressing and stretching mechanism of the transverse stretching mechanism and the strip pressing and stretching mechanism of the longitudinal stretching mechanism correspondingly and simultaneously act;
the strip pressing and stretching mechanism comprises a slidable base, a fixing plate is vertically and fixedly arranged on the base, a second driving motor is fixedly arranged at the top end of the fixing plate, and a strip pressing plate is fixedly arranged on an output shaft of the second driving motor.
2. The apparatus according to claim 1, wherein: the base is connected with an output shaft of the first driving motor, and first concave-convex strips are uniformly distributed on the base.
3. The apparatus according to claim 2, wherein: second concave-convex strips are uniformly distributed at the bottom of the strip pressing plate; and when the strip pressing plate is attached to the base, the second concave-convex strip is meshed with the first concave-convex strip.
4. The apparatus according to claim 1, wherein: the strip pressing plate is in a frame shape or a strip shape.
5. The apparatus according to claim 1, wherein: the point pressure stretching mechanism comprises a slider seat, a connecting column, a third driving motor, a fourth driving motor and a sucker, wherein the slider seat is arranged on a strip pressing plate in a sliding mode, the connecting column is fixedly arranged on the slider seat, the third driving motor is horizontally and fixedly arranged at the top of the connecting column, the fourth driving motor is fixedly arranged at the output end of the third driving motor, and the sucker is fixedly arranged at the output end of the fourth driving motor.
6. The apparatus according to claim 5, wherein: the tension sensor is fixedly arranged at the top of the connecting column.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910316782.2A CN110480996B (en) | 2019-04-19 | 2019-04-19 | Two-way accurate stretching device of film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910316782.2A CN110480996B (en) | 2019-04-19 | 2019-04-19 | Two-way accurate stretching device of film |
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| CN110480996A CN110480996A (en) | 2019-11-22 |
| CN110480996B true CN110480996B (en) | 2021-07-13 |
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| CN201910316782.2A Expired - Fee Related CN110480996B (en) | 2019-04-19 | 2019-04-19 | Two-way accurate stretching device of film |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111244363B (en) * | 2020-01-17 | 2022-03-25 | 深圳市特力新能源科技有限公司 | Lithium ion battery diaphragm, preparation system and preparation method |
| CN111610097B (en) * | 2020-06-11 | 2022-02-08 | 四川大学 | Polymer material four-way or two-way tensile test equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579920A (en) * | 2009-06-09 | 2009-11-18 | 陶波 | Microporous breathable film drawing process and equipment thereof |
| CN103009616A (en) * | 2011-09-19 | 2013-04-03 | 因诺森特·马尔尚特莫里诺 | Apparatus for stretching a thin film of composite material in transverse and longitudinal direction |
| CN105799149A (en) * | 2016-04-26 | 2016-07-27 | 北京华腾佳和科技有限公司 | Chain link assembly, chain and film stretching device capable of reducing longitudinal shrinkage ratio |
-
2019
- 2019-04-19 CN CN201910316782.2A patent/CN110480996B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579920A (en) * | 2009-06-09 | 2009-11-18 | 陶波 | Microporous breathable film drawing process and equipment thereof |
| CN103009616A (en) * | 2011-09-19 | 2013-04-03 | 因诺森特·马尔尚特莫里诺 | Apparatus for stretching a thin film of composite material in transverse and longitudinal direction |
| CN105799149A (en) * | 2016-04-26 | 2016-07-27 | 北京华腾佳和科技有限公司 | Chain link assembly, chain and film stretching device capable of reducing longitudinal shrinkage ratio |
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