A thin film and a manufacturing method thereof

Abstract

The present invention discloses a film, which includes a first structural layer, a second structural layer and a third structural layer. The second structural layer is disposed 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-based plastomer. Through the three-layer structure, the film has strong mechanical properties and flexibility while having good heat resistance and performance, and can maintain the stability of its structure in different environments.

Description

Technical Field

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

[0002] Thin films are commonly used for the outer packaging of articles. Since different articles have different shapes and the storage and transportation environments are also different, it is necessary for the packaging film to have good toughness and also good chemical stability, and be able to maintain its shape basically unchanged under different temperatures and humidities. Summary of the Invention

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

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

[0005] The present invention discloses a thin film, which includes a first structural layer, a second structural layer, and a third structural layer. The second structural layer is disposed between the first structural layer and the third structural layer. The thickness ratio of 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. The third structural layer is composed of polypropylene and acetic acid-based plastomer.

[0006] The present invention also discloses a manufacturing method of a thin film, which includes the following steps:

[0007] S1: Put the master batches of each layer into the corresponding extruder, melt them, and then extrude them;

[0008] S2: Put the extruded blank into a cooling device for cooling;

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

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

[0011] S5: Cut and package.

[0012] Further, the stretching device includes a first support frame. The first support frame includes two side plates. 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 that are arranged equidistantly in the vertical direction in sequence. The first support frame is also installed with a first driving component for driving the stretching roller to rotate and a second driving component for driving the stretching roller to move in the vertical direction.

[0013] Further, the first driving assembly includes a first transmission wheel mounted on the first stretching roller, a second transmission wheel mounted on the second stretching roller, a third transmission wheel mounted on the third stretching roller, a fourth transmission wheel mounted on the fourth stretching roller, and a fifth transmission wheel mounted 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 with a first driving wheel, and the first transmission belt is mounted on the first driving wheel.

[0014] Further, a tensioning assembly is mounted on the first support frame. The tensioning assembly includes a second support frame slidably connected to the first support frame. The second support frame is mounted with a tensioning wheel that fits the first transmission belt. The first support frame is also mounted with a lead screw assembly for driving the second support frame to move.

[0015] Further, the second driving assembly includes a first support plate mounted on the first stretching roller, a second support plate mounted on the second stretching roller, a third support plate mounted on the third stretching roller, a fourth support plate mounted on the fourth stretching roller, and a fifth support plate mounted 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, and the second driving assembly is provided with a transmission rod passing through the mounting holes. The transmission rod is in threaded cooperation with the mounting holes so that the rotation of the transmission rod can drive the movement of the support blocks.

[0016] Further, the first support plate includes a first plate body extending towards the second stretching roller. The second support plate includes a second plate body extending towards the first stretching roller and a third plate body extending towards the second stretching roller. The third support plate includes a fourth plate body extending towards the second stretching roller and a fifth plate body extending towards the fourth stretching roller. The fourth support plate includes a sixth plate body extending towards the third stretching roller and a seventh plate body extending towards the fifth stretching roller. The fifth support plate includes an eighth plate body extending towards the fourth stretching roller. The support blocks include a first support block placed on the side of the first plate body facing the second plate body, a second support block placed on the side of the third plate body facing the fourth plate body, a third support block placed on the side of the sixth plate body facing the fifth plate body, and a fourth support block placed on the side of the eighth plate body facing the seventh plate body. The moving directions of the first support block and the second support block are the same, and the moving directions of the third support block and the fourth support block are the same.

[0017] Further, the second plate body is provided with a first guiding block extending towards the first plate body, the fourth plate body is provided with a second guiding block extending towards the third plate body, the fifth plate body is provided with a third guiding block extending towards the sixth plate body, and the seventh plate body is provided with a fourth guiding block extending towards the eighth plate body. The transmission rod includes a first rod body sequentially passing through the first guiding block, the first support block, the second guiding block, and the second support block, and a second rod body passing through the fourth guiding block, the fourth support block, the third guiding block, and the third support block. The thread matching directions between the first rod body and the first support block, the second support block are opposite to the thread matching directions between the second rod body and the third support block, the fourth support block.

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

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

[0020] 2. The second driving component can drive the movement of each stretching roller, so as to adjust the distance between the stretching rollers, enabling the stretching device to adapt to films of different materials. Description of the Drawings

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

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

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

[0024] Figure 4 is Figure 3 an enlarged view of part A in

[0025] Figure 5 is Figure 3 an enlarged view of part B in

[0026] Reference numerals: first structural layer 100, second structural layer 110, third structural layer 120, first support frame 200, moving 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 driving wheel 221, second driving wheel 222, third driving wheel 223, fourth driving wheel 224, fifth driving wheel 225, second support frame 300, tensioning wheel 310, lead screw 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 implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Refer to Figure 1 , a film, including a first structural layer 100, a second structural layer 110, and a third structural layer 120. The second structural layer 110 is disposed between the first structural layer 100 and the third structural layer 120. The thickness ratio among 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 a mixed resin of polyethylene and methyl acrylate, which is transparent and has good flexibility; the second structural layer 110 is composed of a polyvinylidene chloride polymer and has good mechanical properties to ensure the basic strength of the packaging film. The third structural layer 120 is composed of polypropylene and acetic acid-based plastomer and has good high-temperature resistance to prevent the packaging film from deforming due to high temperature, so that the packaging can adapt to different usage environments.

[0029] Refer to Figures 2 to 5 , this embodiment also provides a manufacturing method of a film, including the following steps:

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

[0031] S2: Put the extruded blank into a cooling device for cooling.

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

[0033] S4: Composite each layer structure to obtain the finished product.

[0034] S5: Cut and then package.

[0035] The stretching device includes a first support frame 200. The first support frame 200 includes two side plates 210. A stretching roller is installed between the two side plates 210. The stretching roller includes 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 that are arranged equidistantly in the vertical direction in sequence. A first guide roller 202 is arranged at the top of the side plate 210, and a second guide roller 216 is arranged at the bottom of the side plate 210. The thick material is introduced from the first guide roller 202 and 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 in sequence to become thin material and then is led out from the second guide roller 216.

[0036] The first support frame 200 is equipped with a first driving component for driving the stretching roller to rotate. The first driving component 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 driven to rotate together by a first transmission belt 411. The bottom of the first support frame 200 is connected with a mounting plate. A first motor 400 is installed on the mounting plate. A first driving wheel 410 is installed on the output shaft of the first motor 400. The first transmission belt 411 is installed on the first driving wheel 410. 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 in sequence, so that the first transmission belt 411 can drive the five stretching rollers to rotate simultaneously. The diameters of the first transmission wheel 221, the third transmission wheel 223 and the fifth transmission wheel 225 are the same. 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. Thus, different-diameter transmission wheels are arranged alternately. By the different diameters of the transmission wheels, the rotation speeds between adjacent stretching rollers are different. The film is stretched by the speed difference.

[0037] The second driving assembly includes a first support plate 600 mounted on the first stretching roller 211, a second support plate 610 mounted on the second stretching roller 212, a third support plate 620 mounted on the third stretching roller 213, a fourth support plate 630 mounted on the fourth stretching roller 214, and a fifth support plate 640 mounted on the fifth stretching roller 215. Support blocks are provided 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, and the second driving assembly is provided with a transmission rod 500 passing through the mounting holes 603. The transmission rod 500 is in threaded cooperation with the mounting holes 603 so that the rotation of the transmission rod 500 can drive the movement of the support blocks.Specifically, the first support plate 600 includes a first plate body 601 extending towards the second stretching roller 212, the second support plate 610 includes a second plate body 611 extending towards the first stretching roller 211 and a third plate body 612 extending towards the second stretching roller 212, the third support plate 620 includes a fourth plate body 621 extending towards the second stretching roller 212 and a fifth plate body 622 extending towards the fourth stretching roller 214, the fourth support plate 630 includes a sixth plate body 631 extending towards the third stretching roller 213 and a seventh plate body 632 extending towards the fifth stretching roller 215, the fifth support plate 640 includes an eighth plate body 641 extending towards the fourth stretching roller 214, the support block includes a first support block 602 placed on one side of the first plate body 601 facing the second plate body 611, a second support block 614 placed on one side of the third plate body 612 facing the fourth plate body 621, a third support block 633 placed on one side of the sixth plate body 631 facing the fifth plate body 622, and a fourth support block 642 placed only on one side of the eighth plate body 641 facing the seventh plate body 632. The second plate body 611 is provided with a first guiding block 613 extending along the first plate body 601, the fourth plate body 621 is provided with a second guiding block 623 extending towards the third plate body 612, the fifth plate body 622 is provided with a third guiding block 624 extending towards the sixth plate body 631, the seventh plate body 632 is provided with a fourth guiding block 634 extending towards the eighth plate body 641. The transmission rod 500 includes a first rod body 501 sequentially passing through the first guiding block 613, the first support block 602, the second guiding block 623, and the second support block 614, and a second rod body 502 passing through the fourth guiding block 634, the fourth support block 642, the third guiding block 624, and the third support block 633. The thread engagement directions between the first rod body 501 and the first support block 602, the second support block 614 are opposite to the thread engagement directions 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 move along the second support plate 610, the second support plate 610 can move along the third support plate 620, the fifth support plate 640 can move along the fourth support plate 630, the fourth support plate 630 can move along the third support plate, and at the same time, the moving 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 close to the third stretching roller 213 in the same direction, the fourth stretching roller 214 and the fifth stretching roller 215 can move away from or close to the third stretching roller 213 in the same direction, and the distances between the stretching rollers can be adjusted to meet the stretching requirements of different materials of the film.

[0038] Meanwhile, to generate slack in the first drive belt 411 after the stretching roller moves, a tensioning assembly is installed on the first support frame 200. The tensioning assembly includes a second support frame 300 slidably connected to the first support. A tensioning wheel 310 is installed on the first support frame 200, and the tensioning wheel 310 is located between the first drive wheel 410 and the fifth drive wheel 225. The tensioning wheel 310 is in contact with the first drive belt 411 to tension the first drive belt 411. A lead screw assembly 320 is installed, and the lead screw 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 lead screw assembly 320, thereby adjusting the pressure of the tensioning wheel 310 on the first drive belt 411 to adjust the tightness of the first drive belt 411.

[0039] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A method for manufacturing a thin film, characterized in that, It includes the following steps: S1: Put each layer of masterbatch into the corresponding extruder, melt it and then extrude it; S2: Put the extruded blank into a cooling device for cooling; S3: Stretch the cooled blank through a stretching device to obtain each single-layer structure; S4: Compose each layer structure to obtain a finished product; S5: Cut and then package; The stretching device includes a first support frame (200), the first support frame (200) includes two side plates (210), stretching rollers are installed between the two side plates (210), and 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) that are arranged equidistantly in sequence along the vertical direction. The first support frame (200) is also equipped with a first driving component for driving the stretching rollers to rotate and a second driving component for driving the stretching rollers to move along the vertical direction. The second driving component 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 block is provided with a mounting hole (603), and the second driving component is provided with a transmission rod (500) passing through the mounting hole (603). The transmission rod (500) is in threaded cooperation with the mounting hole (603) so that the rotation of the transmission rod (500) can drive the movement of the support block. The first support plate (600) includes a first plate body (601) extending towards the second stretching roller (212). The second support plate (610) includes a second plate body (611) extending towards the first stretching roller (211) and a third plate body (612) extending towards the third stretching roller (213). The third support plate (620) includes a fourth plate body (621) extending towards the second stretching roller (212) and a fifth plate body (622) extending towards the fourth stretching roller (214). The fourth support plate (630) includes a sixth plate body (631) extending towards the third stretching roller (213) and a seventh plate body (632) extending towards the fifth stretching roller (215). The fifth support plate (640) includes an eighth plate body (641) extending towards the fourth stretching roller (214). The support block includes a first support block (602) placed on one side of the first plate body (601) facing the second plate body (611), a second support block (614) placed on one side of the third plate body (612) facing the fourth plate body (621), a third support block (633) placed on one side of the sixth plate body (631) facing the fifth plate body (622), and a fourth support block (642) placed only on one side of the eighth plate body (641) facing the seventh plate body (632). 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. The second plate body (611) is provided with a first guiding block (613) extending towards the first plate body (601). The fourth plate body (621) is provided with a second guiding block (623) extending towards the third plate body (612). The fifth plate body (622) is provided with a third guiding block (624) extending towards the sixth plate body (631). The seventh plate body (632) is provided with a fourth guiding block (634) extending towards the eighth plate body (641). The transmission rod (500) includes a first rod body (501) sequentially passing through the first guiding block (613), the first support block (602), the second guiding block (623), and the second support block (614), and a second rod body (502) sequentially passing through the fourth guiding block (634), the fourth support block (642), the third guiding block (624), and the third support block (633). The thread matching directions between the first rod body (501) and the first support block (602), the second support block (614) are opposite to the thread matching directions between the second rod body (502) and the third support block (633), the fourth support block (642).

2. The manufacturing method according to claim 1, characterized in that, 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 driven to rotate together by a first transmission belt (411). The first driving assembly includes a first motor (400), and the first motor (400) is connected with a first driving wheel (410). The first transmission belt (411) is installed on the first driving wheel (410).

3. The manufacturing method according to claim 2, characterized in that, The first support frame (200) is installed with a tensioning assembly. The tensioning assembly includes a second support frame (300) slidably connected with the first support frame (200). The second support frame (300) is installed with a tensioning wheel (310) that fits with the first transmission belt (411). The first support frame (200) is further installed with a lead screw assembly (320) for driving the second support frame (300) to move.

4. A film manufactured by the film manufacturing method according to any one of claims 1 to 3, characterized in that, It includes a first structural layer (100), a second structural layer (110), and a third structural layer (120). The second structural layer (110) is placed between the first structural layer (100) and the third structural layer (120). The thickness ratio among 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. The third structural layer (120) is composed of polypropylene and acetate-based plastomer.

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