Thin film and manufacturing method thereof

Abstract

The invention discloses a film which comprises a first structural layer, a second structural layer and a third structural layer, the second structural layer is arranged between the first structural layer and the third structural layer, the thickness ratio of the first structural layer to the second structural layer to the third structural layer is 1: 2: 1, the first structural layer is composed of polyethylene and methyl acrylate, and the third structural layer is composed of polyethylene and methyl acrylate. The second structural layer is composed of a polyvinylidene chloride polymer, and the third structural layer is composed of polypropylene and an acetic acid-based plastomer. Through the three-layer structure, the thin film has good heat resistance and performance while having high mechanical performance and flexibility, and the structural stability of the thin film can be kept in different environments.

Description

Technical Field

[0001] The present invention relates to the technical field of film production, and more specifically, to a film and a method for manufacturing the same. Background Art

[0002] Films are often used for outer packaging of goods. Since different goods have different shapes and are stored and transported in different environments, the packaging film needs to have good toughness and good chemical stability, and be able to keep its shape basically unchanged under different temperatures and humidities. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a stable packaging film.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention discloses a film, comprising a first structural layer, a second structural layer and a third structural layer, wherein the second structural layer is arranged between the first structural layer and the third structural layer, the thickness ratio among the first structural layer, the second structural layer and the third structural layer is 1:2:1, the first structural layer is composed of polyethylene and methyl acrylate, the second structural layer is composed of polyvinylidene chloride polymer, and the third structural layer is composed of polypropylene and acetate plasticizer.

[0006] The present invention also discloses a method for manufacturing a thin film, comprising the following steps:

[0007] S1: Put the masterbatch of each layer into the corresponding extruder, melt it and extrude it;

[0008] S2: The extruded blank is put into a cooling device for cooling;

[0009] S3: stretching the cooled blank through a stretching device to obtain each single-layer structure;

[0010] S4: Compounding each layer structure to obtain a finished product;

[0011] S5: Packing after cutting.

[0012] Furthermore, the stretching device includes a first support frame, the first support frame includes two side plates, and a stretching roller is installed between the two side plates. The stretching roller includes a first stretching roller, a second stretching roller, a third stretching roller, a fourth stretching roller and a fifth stretching roller which are arranged equidistantly in sequence along the vertical direction. The first support frame is also equipped with a first driving component for driving the stretching roller to rotate and a second driving component for driving the stretching roller to move along the vertical direction.

[0013] Further, the first driving assembly includes a first transmission wheel installed on the first stretching roller, a second transmission wheel installed on the second stretching roller, a third transmission wheel installed on the third stretching roller, a fourth transmission wheel installed on the fourth stretching roller, and a fifth transmission wheel installed on the fifth stretching roller. The first transmission wheel, the second transmission wheel, the third transmission wheel, the fourth transmission wheel and the fifth transmission wheel are driven to rotate together by a first transmission belt. The first driving assembly includes a first motor, the first motor is connected to a first driving wheel, and the first transmission belt is installed on the first driving wheel.

[0014] Furthermore, the first support frame is equipped with a tensioning assembly, and the tensioning assembly includes a second support frame slidably connected to the first support frame, the second support frame is equipped with a tensioning wheel that fits with the first transmission belt, and the first support frame is also equipped with a screw assembly that drives the second support frame to move.

[0015] Furthermore, the second driving assembly includes a first support plate installed on the first stretching roller, a second support plate installed on the second stretching roller, a third support plate installed on the third stretching roller, a fourth support plate installed on the fourth stretching roller, and a fifth support plate installed on the fifth stretching roller. Support blocks are provided between the first support plate and the second support plate, between the second support plate and the third support plate, between the third support plate and the fourth support plate, and between the fourth support plate and the fifth support plate. The support blocks are provided with mounting holes. The second driving assembly is provided with a transmission rod passing through the mounting hole. The transmission rod is threadedly engaged with the mounting hole so that the rotation of the transmission rod can drive the movement of the support block.

[0016] Further, the first support plate includes a first plate body extending toward the second stretching roller, the second support plate includes a second plate body extending toward the first stretching roller and a third plate body extending toward the second stretching roller, the third support plate includes a fourth plate body extending toward the second stretching roller and a fifth plate body extending toward the fourth stretching roller, the fourth support plate includes a sixth plate body extending toward the third stretching roller and a seventh plate body extending toward the fifth stretching roller, the fifth support plate includes an eighth plate body extending toward the fourth stretching roller, the support blocks include a first support block disposed on a side of the first plate body facing the second plate body, a second support block disposed on a side of the third plate body facing the fourth plate body, a third support block disposed on a side of the sixth plate body facing the fifth plate body, and a fourth support block having only a side of the eighth plate body facing the seventh plate body, the first support block and the second support block have the same moving direction, and the third support block and the fourth support block have the same moving direction.

[0017] Furthermore, the second plate body is provided with a first guide block along the first plate body, the fourth plate body is provided with a second guide block extending toward the third plate body, the fifth plate body is provided with a third guide block extending toward the sixth plate body, and the seventh plate body is provided with a fourth guide block extending toward the eighth plate body, and the transmission rod includes a first rod body that passes through the first guide block, the first support block, the second guide block and the second support block in sequence, and a second rod body that passes through the fourth guide block, the fourth support block, the third guide block and the third support block in sequence, and the thread matching direction between the first rod body and the first support block and the second support block is opposite to the thread matching direction between the second rod body and the third support block and the fourth support block.

[0018] The beneficial effects of the present invention are:

[0019] 1. The three-layer structure makes the film have strong mechanical properties and flexibility while having good heat resistance and performance, and can maintain its structural stability in different environments.

[0020] 2. The second driving assembly can drive the movement of the stretching rollers, thereby adjusting the distance between the stretching rollers, so that the stretching device can adapt to films of different materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the structure of the film;

[0022] Figure 2 is a schematic diagram of the structure of the stretching device;

[0023] Figure 3 It is a structural schematic diagram of a stretching roller;

[0024] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 The enlarged view of point B in the middle;

[0026] Reference numerals: first structural layer 100, second structural layer 110, third structural layer 120, first support frame 200, movable groove 201, first guide roller 202, side plate 210, first stretching roller 211, second stretching roller 212, third stretching roller 213, fourth stretching roller 214, fifth stretching roller 215, second guide roller 216, first transmission wheel 221, second transmission wheel 222, third transmission wheel 223, fourth transmission wheel 224, fifth transmission wheel 225, second support frame 300, tensioning wheel 310, screw rod assembly 320, first motor 400, first driving wheel 410, first transmission belt 411 , transmission rod 500, first rod body 501, second rod body 502, first support plate 600, first plate body 601, first support block 602, mounting hole 603, second support plate 610, second plate body 611, third plate body 612, first guide block 613, second support block 614, third support plate 620, fourth plate body 621, fifth plate body 622, second guide block 623, third guide block 624, fourth support plate 630, sixth plate body 631, seventh plate body 632, third support block 633, fourth guide block 634, fifth support plate 640, eighth plate body 641, fourth support block 642. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 A film includes a first structural layer 100, a second structural layer 110 and a third structural layer 120, wherein the second structural layer 110 is disposed between the first structural layer 100 and the third structural layer 120, wherein the thickness ratio of the first structural layer 100, the second structural layer 110 and the third structural layer 120 is 1:2:1, wherein the first structural layer 100 is composed of a mixed resin of polyethylene and methyl acrylate, and is transparent and flexible; the second structural layer 110 is composed of a polyvinylidene chloride polymer, and has good mechanical properties, and can ensure the basic strength of the packaging film; the third structural layer 120 is composed of polypropylene and an acetic acid-based plastic, and has good high temperature resistance, and can prevent the packaging film from being deformed due to high temperature, thereby enabling the packaging to adapt to different usage environments.

[0029] See also Figures 2 to 5 This embodiment also provides a method for manufacturing a thin film, comprising the following steps:

[0030] S1: Put the masterbatch of each layer into the corresponding extruder, melt it and extrude it;

[0031] S2: The extruded blank is put into a cooling device for cooling;

[0032] S3: stretching the cooled blank through a stretching device to obtain each single-layer structure;

[0033] S4: Compounding each layer structure to obtain a finished product;

[0034] S5: Packing after cutting.

[0035] The stretching device includes a first support frame 200, which includes two side plates 210. A stretching roller is installed between the two side plates 210. The stretching rollers include a first stretching roller 211, a second stretching roller 212, a third stretching roller 213, a fourth stretching roller 214 and a fifth stretching roller 215 which are arranged equidistantly in the vertical direction. A first guide roller 202 is arranged on the top of the side plate 210, and a second guide roller 216 is arranged on the bottom of the side plate 210. After the thick material is introduced from the first guide roller 202, it passes through the first stretching roller 211, the second stretching roller 212, the third stretching roller 213, the fourth stretching roller 214 and the fifth stretching roller 215 once to become a thin material and then is discharged from the second guide roller 216.

[0036] The first support frame 200 is equipped with a first driving assembly that drives the stretching roller to rotate. The first driving assembly includes a first transmission wheel 221 installed on the first stretching roller 211, a second transmission wheel 222 installed on the second stretching roller 212, a third transmission wheel 223 installed on the third stretching roller 213, a fourth transmission wheel 224 installed on the fourth stretching roller 214, and a fifth transmission wheel 225 installed on the fifth stretching roller 215. The first transmission wheel 221, the second transmission wheel 222, the third transmission wheel 223, the fourth transmission wheel 224, and the fifth transmission wheel 225 are installed on the fifth stretching roller 215. The transmission wheel 225 is driven to rotate together by the first transmission belt 411. The bottom of the first support frame 200 is connected to a mounting plate, on which a first motor 400 is mounted. The output shaft of the first motor 400 is mounted with a first driving wheel 410, on which a first transmission belt 411 is mounted. The first transmission belt 411 passes through the first transmission wheel 221, the second transmission wheel 222, the third transmission wheel 223, the fourth transmission wheel 224 and the fifth transmission wheel at one time, so that the first transmission belt 411 can drive the five stretching rollers to rotate at the same time. The diameters of the first transmission wheel 221, the third transmission wheel 223 and the fifth transmission wheel 225 are the same, and the diameters of the second transmission wheel 222 and the fourth transmission wheel 224 are the same and smaller than the diameter of the first transmission wheel 221, so that transmission wheels of different diameters are alternately arranged, and the rotation speeds of adjacent stretching rollers are different due to the different transmission wheel diameters, and the film is stretched by the speed difference.

[0037] The second driving assembly includes a first support plate 600 installed on the first stretching roller 211, a second support plate 610 installed on the second stretching roller 212, a third support plate 620 installed on the third stretching roller 213, a fourth support plate 630 installed on the fourth stretching roller 214, and a fifth support plate 640 installed on the fifth stretching roller 215. Support blocks are arranged between the first support plate 600 and the second support plate 610, between the second support plate 610 and the third support plate 620, between the third support plate 620 and the fourth support plate 630, and between the fourth support plate 630 and the fifth support plate 640. The support blocks are provided with mounting holes 603. The second driving assembly is provided with a transmission rod 500 passing through the mounting hole 603. The transmission rod 500 is threadedly matched with the mounting hole 603 so that the rotation of the transmission rod 500 can drive the movement of the support block.Specifically, the first support plate 600 includes a first plate body 601 extending toward the second stretching roller 212, the second support plate 610 includes a second plate body 611 extending toward the first stretching roller 211 and a third plate body 612 extending toward the second stretching roller 212, the third support plate 620 includes a fourth plate body 621 extending toward the second stretching roller 212 and a fifth plate body 622 extending toward the fourth stretching roller 214, the fourth support plate 630 includes a sixth plate body 631 extending toward the third stretching roller 213 and a fifth plate body 632 extending toward the fifth stretching roller 214. 5, the fifth support plate 640 includes an eighth plate 641 extending toward the fourth stretching roller 214, the support blocks include a first support block 602 disposed on a side of the first plate 601 facing the second plate 611, a second support block 614 disposed on a side of the third plate 612 facing the fourth plate 621, a third support block 633 disposed on a side of the sixth plate 631 facing the fifth plate 622, and a fourth support block 642 having only one side of the eighth plate 641 facing the seventh plate 632, the second plate 611 is provided with a first support block 602 disposed on a side of the first plate 601 facing the second plate 611, a second support block 614 disposed on a side of the third plate 612 facing the fourth plate 621, a third support block 633 disposed on a side of the sixth plate 631 facing the fifth plate 622, and only a fourth support block 642 disposed on a side of the eighth plate 641 facing the seventh plate 632, The plate body 601 is provided with a first guide block 613 along the first support block 602, the fourth plate body 621 is provided with a second guide block 623 extending toward the third plate body 612, the fifth plate body 622 is provided with a third guide block 624 extending toward the sixth plate body 631, and the seventh plate body 632 is provided with a fourth guide block 634 extending toward the eighth plate body 641. The transmission rod 500 includes a first rod body 501 that passes through the first guide block 613, the first support block 602, the second guide block 623, and the second support block 614 in sequence, and a first rod body 501 that passes through the fourth guide block 634, the fourth support block The second rod body 502 of the block 642, the third guide block 624 and the third support block 633, the thread matching direction between the first rod body 501 and the first support block 602, the second support block 614 is opposite to the thread matching direction between the second rod body 502 and the third support block 633, the fourth support block 642, so that the moving directions of the first support block 602 and the second support block 614 are the same, the moving directions of the third support block 633 and the fourth support block 642 are the same, but the moving directions of the first support block 602 and the third support block 633 are opposite. By rotating the transmission rod 500, the first support plate 600 can be moved along the second support plate 610, the second support plate 610 can be moved along the third support plate 620, the fifth support plate 640 can be moved along the fourth support plate 630, and the fourth support plate 630 can be moved along the third support plate. At the same time, the movement directions of the first support plate 600, the second support plate 610 and the fourth support plate 630, the fifth support plate 640 are opposite, so that the first stretching roller 211 and the second stretching roller 212 can move away from or approach the third stretching roller 213 in the same direction, and the fourth stretching roller 214 and the fifth stretching roller 215 can move away from or approach the third stretching roller 213 in the same direction, so that the distance between the stretching rollers can be connected to meet the stretching requirements of films of different materials.

[0038] At the same time, in order to relax the first transmission belt 411 after the stretching roller moves, a tensioning assembly is installed on the first support frame 200, and the tensioning assembly includes a second support frame 300 slidably connected to the first support, and a tensioning wheel 310 is installed on the first support frame 200, and the tensioning wheel 310 is located between the first driving wheel 410 and the fifth transmission wheel 225. The tensioning wheel 310 fits the first transmission belt 411 to tension the first transmission belt 411. A screw rod assembly 320 is installed on the first support frame 200, and the screw rod assembly 320 is connected to the second support frame 300 so that the tensioning wheel 310 can be driven to move along the first support frame 200 through the screw rod assembly 320 to adjust the pressure of the tensioning wheel 310 on the first transmission belt 411 to adjust the tightness of the first transmission belt 411.

[0039] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for producing a thin film, characterized in that: The following steps are involved: S1: Put the masterbatch of each layer into the corresponding extruder, melt it and extrude it; S2: The extruded blank is put into a cooling device for cooling; S3: stretching the cooled blank through a stretching device to obtain each single-layer structure; S4: Compounding each layer structure to obtain a finished product; S5: Packing after cutting.

2. The manufacturing method according to claim 1, characterized in that: The stretching device comprises a first support frame (200), the first support frame (200) comprises two side plates (210), a stretching roller is installed between the two side plates (210), the stretching roller comprises a first stretching roller (211), a second stretching roller (212), a third stretching roller (213), a fourth stretching roller (214) and a fifth stretching roller (215) which are arranged in sequence and equidistantly in a vertical direction, and the first support frame (200) is also equipped with a first driving component for driving the stretching roller to rotate and a second driving component for driving the stretching roller to move along the vertical direction.

3. The manufacturing method according to claim 2, characterized in that: The first driving assembly comprises a first transmission wheel (221) installed on the first stretching roller (211), a second transmission wheel (222) installed on the second stretching roller (212), a third transmission wheel (223) installed on the third stretching roller (213), a fourth transmission wheel (224) installed on the fourth stretching roller (214), and a fifth transmission wheel (225) installed on the fifth stretching roller (215); the first transmission wheel (221), the second transmission wheel (222), the third transmission wheel (223), the fourth transmission wheel (224), and the fifth transmission wheel (225) are driven to rotate together by a first transmission belt (411); the first driving assembly comprises a first motor (400); the first motor (400) is connected to a first driving wheel (410); and the first transmission belt (411) is installed on the first driving wheel (410).

4. The manufacturing method according to claim 3, characterized in that: The first support frame (200) is installed with a tensioning assembly, and the tensioning assembly includes a second support frame (300) slidably connected to the first support frame (200), the second support frame (300) is installed with a tensioning wheel (310) in contact with the first transmission belt (411), and the first support frame (200) is also installed with a screw assembly (320) for driving the second support frame (300) to move.

5. The manufacturing method according to claim 2, characterized in that: The second driving assembly comprises a first support plate (600) installed on the first stretching roller (211), a second support plate (610) installed on the second stretching roller (212), a third support plate (620) installed on the third stretching roller (213), a fourth support plate (630) installed on the fourth stretching roller (214), and a fifth support plate (640) installed on the fifth stretching roller (215), wherein the first support plate (600) and the second support plate (610) are connected to each other and the second support plate (610) is connected to each other. ) and the third support plate (620), between the third support plate (620) and the fourth support plate (630), and between the fourth support plate (630) and the fifth support plate (640). Support blocks are provided, and the support blocks are provided with mounting holes (603). The second driving assembly is provided with a transmission rod (500) passing through the mounting hole (603). The transmission rod (500) is threadedly matched with the mounting hole (603) so that the rotation of the transmission rod (500) can drive the movement of the support block.

6. The manufacturing method according to claim 5, characterized in that: The first support plate (600) includes a first plate body (601) extending toward the second stretching roller (212); the second support plate (610) includes a second plate body (611) extending toward the first stretching roller (211) and a third plate body (612) extending toward the second stretching roller (212); the third support plate (620) includes a fourth plate body (621) extending toward the second stretching roller (212) and a fifth plate body (622) extending toward the fourth stretching roller (214); the fourth support plate (630) includes a sixth plate body (631) extending toward the third stretching roller (213) and a seventh plate body (632) extending toward the fifth stretching roller (215); the fifth support plate (630) includes a sixth plate body (631) extending toward the third stretching roller (213) and a seventh plate body (632) extending toward the fifth stretching roller (215); The support plate (640) includes an eighth plate body (641) extending toward the fourth stretching roller (214), and the support blocks include a first support block (602) disposed on a side of the first plate body (601) facing the second plate body (611), a second support block (614) disposed on a side of the third plate body (612) facing the fourth plate body (621), a third support block (633) disposed on a side of the sixth plate body (631) facing the fifth plate body (622), and a fourth support block (642) only on a side of the eighth plate body (641) facing the seventh plate body (632), the first support block (602) and the second support block (614) have the same moving direction, and the third support block (633) and the fourth support block (642) have the same moving direction.

7. The manufacturing method according to claim 6, characterized in that: The second plate (611) is provided with a first guide block (613) extending toward the first plate (601), the fourth plate (621) is provided with a second guide block (623) extending toward the third plate (612), the fifth plate (622) is provided with a third guide block (624) extending toward the sixth plate (631), the seventh plate (632) is provided with a fourth guide block (634) extending toward the eighth plate (641), and the transmission rod (500) includes a plurality of guide blocks passing through the first guide block (613), the third guide block (623) and the fourth guide block (623) in sequence. A first rod body (501) passing through a first support block (602), a second guide block (623) and a second support block (614) and a second rod body (502) passing through a fourth guide block (634), a fourth support block (642), a third guide block (624) and a third support block (633); a threaded matching direction between the first rod body (501) and the first support block (602) and the second support block (614) is opposite to a threaded matching direction between the second rod body (502) and the third support block (633) and the fourth support block (642).

8. A film manufactured using the film manufacturing method according to any one of claims 1 to 7, characterized in that: The invention comprises a first structural layer (100), a second structural layer (110) and a third structural layer (120), wherein the second structural layer (110) is disposed between the first structural layer (100) and the third structural layer (120), and the thickness ratio between the first structural layer (100), the second structural layer (110) and the third structural layer (120) is 1:2:

1. The first structural layer (100) is composed of polyethylene and methyl acrylate, the second structural layer (110) is composed of polyvinylidene chloride polymer, and the third structural layer (120) is composed of polypropylene and acetate plastic.

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