A process for preparing biodegradable plastic bags

Abstract

This invention relates to the field of biodegradable plastic bags, and more specifically, to a process for preparing biodegradable plastic bags. The process includes the following steps: S1: Adding plastic granules to a container and heating them to melt; S2: Extruding the melted plastic granules in a ring shape, then cooling them to form a long plastic tube; S3: Cutting the long plastic tube into plastic sleeves at equal intervals, and fitting the plastic sleeves onto a preparation device; S4: Pressing inward portions onto both sides of the plastic sleeves; S5: Pressing multiple reinforcing plastic strips into the bottom of the plastic sleeves, and then sealing the bottom of the plastic sleeves. The plastic granules are starch-modified polyethylene granules, starch-modified polypropylene granules, or starch-modified polyvinyl chloride granules. In step S1, the plastic granules are added to the container and heated to 120℃-160℃ to melt. Multiple reinforcing plastic strips can be pressed into the bottom of the plastic sleeves before sealing the bottom of the plastic sleeves to strengthen the bottom of the plastic bag.

Description

Technical Field

[0001] This invention relates to the field of biodegradable plastic bags, and more specifically to a process for preparing biodegradable plastic bags. Background Technology

[0002] Biodegradable plastics refer to a class of plastics whose properties meet usage requirements, remain unchanged during their shelf life, and degrade into environmentally harmless substances under natural conditions after use. Currently, there are several types of new plastics: photodegradable plastics, biodegradable plastics, photo- and oxidative biodegradable plastics, carbon dioxide-based biodegradable plastics, and thermoplastic starch resin degradable plastics. However, biodegradable plastics have a drawback: they are relatively weaker than ordinary plastics and less robust. Therefore, the bottom of biodegradable plastic bags needs to be reinforced to ensure they do not leak when carrying heavy loads. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a process for preparing biodegradable plastic bags, the beneficial effect of which is that multiple reinforcing plastic strips can be pressed into the bottom of the plastic sleeve, and then the bottom of the plastic sleeve is sealed to strengthen the bottom of the plastic bag.

[0004] A process for preparing biodegradable plastic bags includes the following steps:

[0005] S1: Add plastic granules to a container and heat them to melt;

[0006] S2: The molten plastic granules are extruded in a ring and then cooled to form a long plastic tube;

[0007] S3: Cut the long plastic tube into plastic sleeves at equal intervals, and put the plastic sleeves on the preparation device;

[0008] S4: Press out the inner portion on both sides of the plastic sleeve;

[0009] S5: Press multiple reinforcing plastic strips into the bottom of the plastic sleeve, and then seal the bottom of the plastic sleeve.

[0010] The plastic granules are starch-modified polyethylene granules.

[0011] The plastic granules are starch-modified polypropylene granules.

[0012] The plastic granules are starch-modified polyvinyl chloride granules.

[0013] In step S1, plastic granules are added to a container and heated to 120°C-160°C until they melt. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 A flowchart of a biodegradable plastic bag manufacturing process;

[0016] Figure 2 This is a flowchart of Example 1;

[0017] Figure 3 This is a flowchart of Example 2;

[0018] Figure 4 This is a flowchart of Example 3;

[0019] Figure 5 Schematic diagram of the preparation device Figure 1 ;

[0020] Figure 6 Schematic diagram of the preparation device Figure 2 ;

[0021] Figure 7 Schematic diagram of the preparation device Figure 3 ;

[0022] Figure 8 Schematic diagram of the side block and plastic sleeve Figure 1 ;

[0023] Figure 9 Schematic diagram of the side block and plastic sleeve Figure 2 ;

[0024] Figure 10 This is a schematic diagram of the central column structure;

[0025] Figure 11 Schematic diagram of the base frame Figure 1 ;

[0026] Figure 12 Schematic diagram of the base frame Figure 2 ;

[0027] Figure 13 Schematic diagram of track II Figure 1 ;

[0028] Figure 14 Schematic diagram of track II Figure 2 .

[0029] In the diagram: Side block 101; Hinge rod 102; Sliding sleeve 103; Middle rod 104; Side groove 105; Horizontal column 106;

[0030] Plastic sleeve 201; Reinforcing plastic strip 202; Inner section 203;

[0031] Center column 301; T-shaped bracket 302; round cutter 303; rectangular cutter 304;

[0032] Base frame 401; Side frame 402; Side column 403; Pressure strip 404; Silicone block 405; Translation frame 406; Track I 407;

[0033] Track II 501; Square column 502; Motor 503; Motor base 504; Drive roller 505; Hot-pressed rib 506; Upright pole 507. Detailed Implementation

[0034] Example 1:

[0035] S1: Add starch-modified polyethylene to a container and heat it to 160°C until it melts;

[0036] S2: The molten starch-modified polyethylene granules are extruded in a ring and then cooled to form a long plastic tube;

[0037] S3: Cut the long plastic tube into plastic sleeves 201 at equal intervals, and put the plastic sleeves 201 on the preparation device;

[0038] S4: Press out the inner portion 203 on both sides of the plastic sleeve 201;

[0039] S5: Press multiple reinforcing plastic strips 202 into the bottom of the plastic sleeve 201, and then seal the bottom of the plastic sleeve 201.

[0040] Example 2:

[0041] S1: Add starch-modified polypropylene granules into a container and heat to 150°C to melt them;

[0042] S2: The molten starch-modified polypropylene granules are extruded in a ring and then cooled to form a long plastic tube;

[0043] S3: Cut the long plastic tube into plastic sleeves 201 at equal intervals, and put the plastic sleeves 201 on the preparation device;

[0044] S4: Press out the inner portion 203 on both sides of the plastic sleeve 201;

[0045] S5: Press multiple reinforcing plastic strips 202 into the bottom of the plastic sleeve 201, and then seal the bottom of the plastic sleeve 201.

[0046] Example 3:

[0047] S1: Add starch-modified polyvinyl chloride granules into a container and heat to 155℃ to melt them;

[0048] S2: The molten starch-modified polyvinyl chloride granules are extruded in a ring and then cooled to form a long plastic tube;

[0049] S3: Cut the long plastic tube into plastic sleeves 201 at equal intervals, and put the plastic sleeves 201 on the preparation device;

[0050] S4: Press out the inner portion 203 on both sides of the plastic sleeve 201;

[0051] S5: Press multiple reinforcing plastic strips 202 into the bottom of the plastic sleeve 201, and then seal the bottom of the plastic sleeve 201.

[0052] like Figure 8-9 As shown, this example can achieve the effect of reinforcing the bottom of the plastic sleeve 201.

[0053] Since the preparation device includes side blocks 101, side grooves 105 and a horizontal column 106, the two side blocks 101 are slidably connected to the two ends of the horizontal column 106, and the two side grooves 105 are respectively set on the sides of the two side blocks 101. When preparing the plastic bag, the plastic sleeve 201 is put between the two side blocks 101, and the two side blocks 101 slide away from each other on the horizontal column 106. The plastic sleeve 201 is supported by the two side blocks 101, and then the two sides of the plastic sleeve 201 are pressed into the side grooves 105 to form an inner part 203 on the two sides of the plastic sleeve 201. The inner parts 203 on both sides allow the plastic bag to hold a larger object. Then, multiple reinforcing plastic strips 202 are hot-pressed on the bottom of the plastic sleeve 201 to strengthen the bottom of the plastic sleeve 201 and improve the strength of the plastic bag. Then, the bottom of the plastic sleeve 201 is sealed.

[0054] like Figure 8-9 As shown, this example can achieve the effect of driving two side blocks 101 to support plastic sleeves 201 of different sizes.

[0055] Since the preparation device also includes a hinge rod 102, a sliding sleeve 103 and a central rod 104, a central rod 104 is welded to the middle of the rear side of the horizontal column 106, and a sliding sleeve 103 is slidably connected to the rear of the central rod 104. A fastening screw is threaded onto the sliding sleeve 103, and two hinge rods 102 are hinged to the sliding sleeve 103. The other ends of the two hinge rods 102 are respectively hinged to the two side blocks 101. By sliding the sliding sleeve 103 on the central rod 104, the two hinge rods 102 can drive the two side blocks 101 to slide, controlling the two side blocks 101 to move closer or further away from each other, thereby driving the two side blocks 101 to support the plastic sleeves 201 of different sizes.

[0056] like Figure 10 As shown, this example can achieve the effect of cutting two holes on the upper and lower sides of the back of the plastic sleeve 201 to serve as handles.

[0057] Since the preparation device also includes a central column 301, a T-shaped frame 302 and a rectangular blade 304, the rear end of the central rod 104 is connected to the middle of the central column 301 by screws. The upper and lower ends of the central column 301 are slidably connected to the T-shaped frame 302. The opposite sides of the two T-shaped frames 302 are provided with rectangular blades 304. The T-shaped frames 302 are driven to slide by a hydraulic cylinder. The central column 301 can support the central rod 104 and the two side blocks 101. When the two T-shaped frames 302 approach each other, they can drive the two rectangular blades 304 to press against the upper and lower sides of the rear of the plastic sleeve 201, thereby cutting two holes for use as handles on the upper and lower sides of the rear of the plastic sleeve 201.

[0058] like Figure 10 As shown, this example demonstrates how to make a plastic bag sealable when needed.

[0059] Since the preparation device also includes circular knives 303, multiple circular knives 303 are welded to the opposite sides of the two T-shaped frames 302. When the two T-shaped frames 302 approach each other, they can drive the multiple circular knives 303 to press against the upper and lower sides of the back of the plastic bag, cutting multiple circular holes on the upper and lower sides of the back of the plastic bag. A rope can be threaded through these circular holes, so that the plastic bag can be sealed when needed.

[0060] like Figure 11-12 As shown, this example can achieve the effect of machining inward portions 203 on both sides of the plastic sleeve 201.

[0061] Since the preparation device also includes a base frame 401, side frames 402, side columns 403 and pressure strips 404, the lower end of the central column 301 is connected to the rear of the base frame 401 by screws. The left and right sides of the base frame 401 are connected to the side frames 402 by screws. The upper part of each side frame 402 is slidably connected to the side column 403. The inner end of each side column 403 is connected to the pressure strip 404 by screws. The side columns 403 are driven to slide by a hydraulic cylinder. Driving the two side columns 403 to move inward can drive the two pressure strips 404 to move inward, so that the two pressure strips 404 press against the two side grooves 105 respectively, thereby processing the inner portion 203 on both sides of the plastic sleeve 201.

[0062] The preparation device also includes silicone blocks 405, a translation frame 406 and a track I407. The front part of the base frame 401 is connected to the track I407 by screws. The translation frame 406 is slidably connected on the track I407. The translation frame 406 is driven to slide by a hydraulic cylinder. Multiple silicone blocks 405 are arranged on the upper part of the translation frame 406 from left to right. The multiple silicone blocks 405 are located on the front side of the two side blocks 101.

[0063] like Figure 11-12 As shown, this example can achieve the effect of reinforcing the bottom of the plastic sleeve 201.

[0064] Multiple silicone blocks 405 are used to attach multiple reinforcing plastic strips 202. The silicone blocks 405 are made of silicone, which facilitates the attachment and removal of the reinforcing plastic strips 202. Then, the translation frame 406 is driven to move backward along the track I407, thereby moving the multiple reinforcing plastic strips 202 to the bottom of the plastic sleeve 201. Then, the two ends of each reinforcing plastic strip 202 are respectively heat-pressed onto the bottom of the plastic sleeve 201 to reinforce the bottom of the plastic sleeve 201.

[0065] The preparation device further includes a track II 501, a square column 502, a motor 503, a motor base 504, a drive roller 505, hot pressing ribs 506, and a vertical rod 507. The track II 501 is welded to the base frame 401. The lower part of the vertical rod 507 is slidably connected to the track II 501 in the front-back direction. The vertical rod 507 is driven to slide by a hydraulic cylinder. The right parts of the two hot pressing ribs 506 are slidably connected to the upper and lower ends of the vertical rod 507, respectively. Each of the two hot pressing ribs 506 is provided with a heating wire. Both of the two hot pressing ribs 506 are driven to slide by a hydraulic cylinder. The lower end of the square column 502 is welded to the track II 501. Both the upper and lower ends of the square column 502 are slidably connected to the motor base 504. Both of the two motor bases 504 are driven to slide by a hydraulic cylinder. Each motor base 504 is connected to a motor 503 by screws. Each output shaft of the motor 503 is connected to a drive roller 505 by a coupling. Two side blocks 101 are located between the two drive rollers 505.

[0066] like Figure 13-14 As shown, this example can achieve the effect of straight-line heat sealing of the bottom of the plastic sleeve 201.

[0067] Both motor mounts 504 can slide vertically on the square column 502, thereby causing the two drive rollers 505 to press on both sides of the plastic sleeve 201 respectively. Then, the two motors 503 drive the two drive rollers 505 to rotate, and the rotation of the two drive rollers 505 can drive the plastic sleeve 201 to move back and forth on the side block 101. The heating wires on the two hot pressing ridges 506 heat the two hot pressing ridges 506, and then the two hot pressing ridges 506 press against the two ends of the multiple reinforcing plastic strips 202 respectively. First, the multiple reinforcing plastic strips 202 are hot-pressed onto the plastic sleeve 201, and then the plastic sleeve 201 is driven to move forward, so that the two hot pressing ridges 506 come closer to each other and press onto the plastic sleeve 201, and the bottom of the plastic sleeve 201 is sealed by straight hot pressing, and the plastic sleeve 201 is completely sealed. When this straight hot pressing seal is damaged, the multiple reinforcing plastic strips 202 can still support the objects inside the plastic bag.

Claims

1. A process for preparing biodegradable plastic bags, characterized in that, Includes the following steps: S1: Add plastic granules to a container and heat them to melt; S2: The molten plastic granules are extruded in a ring and then cooled to form a long plastic tube; S3: Cut the long plastic tube into plastic sleeves (201) at equal intervals, and put the plastic sleeves (201) on the preparation device; S4: Press out the inner portion (203) on both sides of the plastic sleeve (201); S5: Press multiple reinforcing plastic strips (202) into the bottom of the plastic sleeve (201), and then seal the bottom of the plastic sleeve (201); The preparation device includes side blocks (101), side grooves (105) and a horizontal column (106). The two side blocks (101) are slidably connected to the two ends of the horizontal column (106), and each side block (101) has a side groove (105) on its side. The preparation device also includes a hinge rod (102), a sliding sleeve (103) and a central rod (104). The central rod (104) is fixedly connected to the middle of the rear side of the horizontal column (106). The sliding sleeve (103) is slidably connected to the rear of the central rod (104). A fastening screw is threaded on the sliding sleeve (103). Two hinge rods (102) are hinged on the sliding sleeve (103). The other ends of the two hinge rods (102) are respectively hinged to two side blocks (101). The preparation device also includes a central column (301), a T-shaped frame (302), and a rectangular blade (304). The rear end of the central rod (104) is fixedly connected to the middle part of the central column (301). The upper and lower ends of the central column (301) are slidably connected to the T-shaped frame (302). The rectangular blade (304) is provided on the opposite sides of the two T-shaped frames (302). The T-shaped frame (302) is driven to slide by a hydraulic cylinder. The preparation device also includes a circular knife (303), and multiple circular knives (303) are fixedly connected to the opposite sides of the two T-shaped frames (302); The preparation device further includes a base frame (401), side frames (402), side columns (403), and pressure strips (404). The lower end of the central column (301) is fixedly connected to the rear of the base frame (401). Side frames (402) are fixedly connected to both the left and right sides of the base frame (401). A side column (403) is slidably connected to the upper part of each side frame (402). A pressure strip (404) is fixedly connected to the inner end of each side column (403). The side columns (403) are driven to slide by a hydraulic cylinder.

2. The biodegradable plastic bag preparation process according to claim 1, characterized in that: The plastic granules are starch-modified polyethylene granules.

3. The process for preparing a biodegradable plastic bag according to claim 1, characterized in that: The plastic granules are starch-modified polypropylene granules.

4. The biodegradable plastic bag preparation process according to claim 1, characterized in that: The plastic granules are starch-modified polyvinyl chloride granules.

5. The biodegradable plastic bag preparation process according to claim 1, characterized in that: In step S1, plastic granules are added to a container and heated to 120°C-160°C until they melt.

6. The process for preparing a biodegradable plastic bag according to claim 1, characterized in that: The preparation device also includes silicone blocks (405), a translation frame (406), and a track I (407). The front part of the base frame (401) is connected to the track I (407) by screws. The translation frame (406) is slidably connected on the track I (407). The translation frame (406) is driven to slide by a hydraulic cylinder. Multiple silicone blocks (405) are arranged from left to right on the upper part of the translation frame (406). The multiple silicone blocks (405) are located on the front side of the two side blocks (101).

7. The biodegradable plastic bag preparation process according to claim 6, characterized in that: The preparation device further includes a track II (501), a square column (502), a motor (503), a motor base (504), a drive roller (505), hot-pressing ribs (506), and a vertical rod (507). The track II (501) is welded to the base frame (401). The lower part of the vertical rod (507) is slidably connected to the track II (501) in the front-back direction. The vertical rod (507) is driven to slide by a hydraulic cylinder. The right parts of the two hot-pressing ribs (506) are slidably connected to the upper and lower ends of the vertical rod (507), respectively. All are equipped with heating wires. The two hot pressing edges (506) are driven to slide by hydraulic cylinders. The lower end of the square column (502) is welded to the track II (501). The upper and lower ends of the square column (502) are slidably connected to motor seats (504). The two motor seats (504) are driven to slide by hydraulic cylinders. Each motor seat (504) is connected to a motor (503) by screws. The output shaft of each motor (503) is connected to a drive roller (505) by a coupling. The two side blocks (101) are located between the two drive rollers (505).

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