CN112590307A

CN112590307A - Method for manufacturing degradable plastic packaging bag

Info

Publication number: CN112590307A
Application number: CN202011426777.6A
Authority: CN
Inventors: 蒋安国
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-04-02

Abstract

The invention relates to a manufacturing method of a degradable plastic packaging bag, which relates to the technical field of packaging bag preparation, and uses production equipment of the degradable plastic packaging bag, wherein the production equipment comprises an operation table, a fixing and cutting device for fixing and cutting a plastic packaging bag film is arranged on the operation table, and an edge sealing device for sealing the cut plastic packaging bag film and a material taking and placing device are also arranged on the operation table.

Description

Method for manufacturing degradable plastic packaging bag

Technical Field

The invention relates to the technical field of packaging bag preparation, in particular to a manufacturing method of a degradable plastic packaging bag.

Background

The degradable plastic bag is called as an environment-friendly plastic bag, the environment-friendly plastic bag is a short name of various biodegradable plastic bags, and with the development of science and technology, various materials capable of replacing traditional PE plastics appear, including high polymer materials such as PLA, PHAs, PBA, PBS and the like. Can replace the traditional PE plastic bag. The environmental protection plastic bag is widely applied at present: supermarket shopping bags, rolling freshness protection bags, mulching films and the like have large-scale application examples in China. The natural degradation and short degradation time are obvious great trends in the field of packaging in the future.

At the in-process of current plastic bag mill to the preparation of degradable plastic packaging bag, generally blow into the plastic packaging bag film through the blowing machine with degradable plastic pellet through the blowing machine, the rethread guillootine cuts into the size that needs with the plastic packaging bag film, and operating personnel carries out the involution through foot-operated capper to the plastic packaging bag film at last in order to accomplish the preparation of degradable plastic packaging bag, after accomplishing again by operating personnel with the degradable plastic bag after the banding take off can.

The above prior art solutions have the following drawbacks: when the edge of the degradable plastic bag is folded and the folded edge is sealed, the plastic packaging bag film needs to be cut in advance, and the sealed degradable plastic bag needs to be taken down after sealing, so that the operation process is complicated, the labor intensity is high, the production efficiency is low, and the method is not suitable for large-scale production of the degradable plastic bag; in addition, the sealing width of the foot-operated sealing machine is single, and the sealing of plastic bags with different sealing widths is difficult to achieve, so that the sealing machine also has an improved space.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a manufacturing method of a degradable plastic packaging bag, which has the effects of convenient and quick sealing and better edge sealing effect.

The above object of the present invention is achieved by the following technical solutions:

a manufacturing method of a degradable plastic packaging bag uses a production device of the degradable plastic packaging bag, the device comprises an operation table, a fixing and cutting device for fixing and cutting a plastic packaging bag film is arranged on the operation table, and an edge sealing device for sealing the cut plastic packaging bag film and a material taking and placing device are further arranged on the operation table, wherein the material taking and placing device is arranged on the operation table;

the fixed cutting device comprises a fixed cylinder, two insertion columns, a fixed frame, a driving gear, a driving belt, a driving motor, a cutting cylinder, a cutting knife and a height adjusting device, wherein the fixed cylinder is provided with two fixed cylinders which are fixedly arranged above the operating platform, the insertion columns are inserted and slid in the fixed cylinder and extend towards the operating platform, the height adjusting device is arranged between the fixed cylinder and the insertion columns to adjust the height between the fixed cylinder and the insertion columns, the fixed frame is fixedly arranged at the end part of the insertion columns and extends along the width direction of the operating platform, the driving gear is rotatably arranged at one side of the fixed frame close to the operating platform, the driving belt is sleeved between the two driving gears, the driving motor is arranged on the fixed frame and drives the driving gear to rotate, and a passing space for a packaging bag film to pass through is formed between the driving belt and the operating platform, the cutting cylinder is arranged above the operating platform, extends towards the table top of the operating platform and is positioned between the two fixed cylinders, and the cutting knife is fixedly arranged and used for cutting the end part of the cylinder so as to cut the packaging bag film;

the edge sealing device comprises a conveying frame, a bearing plate, an edge sealing frame, a driving cylinder, a push rod, a fixing frame, a stress block, a supporting pressure spring, a connecting pressure spring and a heating extrusion block, wherein the conveying frame is arranged on an operating platform and positioned below the driving belt, the bearing plate is fixedly arranged on the conveying frame to bear the cut packaging bag film, the edge sealing frame is fixedly arranged on the bearing plate, the fixing frame is arranged on the inner side of the edge sealing frame in a sliding manner and positioned above the bearing plate, the stress block is arranged above the fixing frame along one side of the length direction of the fixing frame, the supporting pressure spring is arranged between the stress block and the fixing frame to manufacture the stress block, the connecting pressure spring is arranged in the middle of the lower side of the stress block, the heating extrusion block is arranged at one end of the connecting pressure spring far away from the stress block, the driving cylinder is fixedly arranged on the side edge sealing, the push rod is fixedly arranged at the end part of the driving cylinder and is in sliding contact with the stress block;

the material taking and placing device comprises a rotating motor, a rotating rod, an adsorption disc, a telescopic cylinder and a collecting frame, wherein the rotating motor is fixedly arranged on the conveying frame, the rotating rod is fixed on an output shaft of the rotating motor, the telescopic flag pole is arranged on the rotating rod and extends downwards, and the adsorption disc is fixedly arranged at the end part of the telescopic cylinder;

the method for manufacturing the degradable plastic packaging bag by using the degradable plastic packaging bag production equipment comprises the following steps:

s1: extruding and cutting, namely cutting the extruded packaging bag film according to the required size through a fixed cutting device after the packaging bag film is extruded through an extruder;

s2: transferring a blank holder, performing blank holder forming on the packaging bag film subjected to cutting in the step 1 through a blank holder device, and adjusting the position of the blank holder device to change the width of the blank holder;

s3: transferring and placing, namely transferring the degradable plastic packaging bag after edge sealing is finished into a mobile phone frame through a material taking and placing device;

s4: and (4) centralized transportation, namely performing centralized collection and centralized transportation on the degradable plastic packaging bags in the collection frame.

As a preferred technical scheme, the height adjusting device comprises a first threaded rod, a second threaded rod, a threaded sleeve, a limiting block, a limiting groove and a penetrating groove, the first threaded rod is fixedly installed at the bottom of the fixed cylinder, the second threaded rod is fixedly installed at one end, close to the fixed cylinder, of the insertion column, the limiting block is integrally arranged on the insertion column, the limiting groove is formed in the inner side of the fixed cylinder and is limited by the limiting block in a sliding mode, two ends of the threaded sleeve are installed on the first threaded rod and the second threaded rod in threaded mode, the threaded directions of the first threaded rod and the second threaded rod are opposite, and the penetrating groove is formed in the side wall of the fixed cylinder and is communicated with the inner cavity of the fixed cylinder.

As a preferable technical scheme of the invention, the second threaded rod is provided with a display scale for displaying the height of the driving belt, and the fixed cylinder is provided with corresponding lines matched with the display scale.

According to the preferred technical scheme, a sliding connection device is arranged between the fixing frame and the edge sealing frame and comprises a sliding block, a sliding groove, an upper driving rod, a lower driving rod, a fixing block and a touch rod, the fixing block is fixedly installed on the outer surface of the edge sealing frame, the upper driving rod and the lower driving rod are both installed on the fixing block in a threaded mode and face the upper side and the lower side respectively, an adjusting rod in threaded connection with the upper driving rod and the lower driving rod is further connected onto the fixing block in a threaded mode, the sliding block is integrally arranged on the fixing frame, the sliding groove is formed in the edge sealing frame and used for the sliding block to be inserted and slid, the touch rod is installed at one end, away from the fixing block, of the upper driving rod and the lower driving rod in a sliding mode through a connection device, and.

As a preferred technical scheme of the present invention, the connecting device includes an installation cover, a connecting rod, an arc-shaped groove and a connecting ball, the installation cover covers the end portions of the upper driving rod and the lower driving rod, the arc-shaped groove is disposed at one side of the installation cover close to the upper driving rod or the lower driving rod, a through groove communicated with the arc-shaped groove is left between the installation cover and the upper driving rod or the lower driving rod, the connecting rod is integrally disposed at one end of the abutting rod end close to the fixing block and is inserted into and slid in the through groove, and the connecting ball is integrally disposed at one end of the abutting rod close to the fixing block and is slid in the.

In summary, the invention includes at least one of the following beneficial technical effects:

1. in the actual in-process of making to degradable plastic packaging bag, through the setting of fixed cutting device, can be faster cut the wrapping bag film, the rethread banding device carries out the banding operation to the wrapping bag film after cutting, and can adjust the thickness of banding, improves the practicality of device, and the degradable plastic packaging bag that accomplishes the banding at last gets through the material gets put the device collect can. The operation is convenient and fast, and the convenience of actual operation is improved.

2. The height adjusting device is arranged, so that the distance between the driving belt and the operating platform can be controlled in the actual operation process, the height of the mounting frame fixed on the fixing seat is controlled, clinker packaging bags with different thicknesses can be compressed according to the height adjustment, and the practicability and the utilization rate of the device in actual work are further improved;

3. the setting of sliding connection device, at actual operation's in-process, the fixed frame of control that can be quick slides on the banding frame, also can adjust fast when needs adjustment banding width to further improve the effect of actual operation's convenience.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Fig. 2 is a schematic diagram of the main structure of the present invention.

Fig. 3 is a schematic view of the structure of the fixed cutting device.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a schematic structural view of the edge banding device.

Fig. 6 is a schematic view of the structure of the sliding coupling device.

Fig. 7 is an enlarged schematic view of a portion B in fig. 6.

Fig. 8 is a schematic structural diagram of the material taking and placing device.

In the figure, 1, an operation table; 2. fixing the cutting device; 3. a sealing device; 4. a material taking and placing device; 21. a fixed cylinder; 22. inserting the column; 23. a fixed mount; 24. a drive gear; 25. a drive belt; 26. a drive motor; 27. a cutting cylinder; 28. cutting knife; 5. a height adjustment device; 6. a traffic space; 31. a transfer frame; 32. a bearing plate; 33. a sealing frame; 34. a driving cylinder; 35. a push rod; 36. a fixing frame; 37. a stress block; 38. supporting a pressure spring; 39. connecting a pressure spring; 310. heating the extrusion block; 41. rotating the motor; 42. rotating the rod; 43. an adsorption tray; 44. a telescopic cylinder; 45. a collection frame; 51. a first threaded rod; 52. a second threaded rod; 53. a threaded sleeve; 54. a limiting block; 55. a limiting groove; 56. a groove is arranged in a penetrating way; 521. displaying scales; 211. corresponding lines; 7. a sliding connection device; 71. a sliding block; 72. a sliding groove; 73. an upper drive rod; 74. a lower drive rod; 75. a fixed block; 76. a touch bar; 77. adjusting a rod; 8. a connecting device; 81. installing a cover; 82. a connecting rod; 83. an arc-shaped slot; 84. and connecting the ball.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 2, in order to more conveniently perform edge sealing operation on a degradable plastic bag, a degradable plastic bag manufacturing apparatus is used in the method for manufacturing the degradable plastic bag disclosed by the invention; the device comprises an operation table 1, wherein the operation table 1 is a workbench arranged on a workshop, a fixing and cutting device 2 for fixing and cutting the plastic packaging bag film is arranged on the operation table 1, and an edge sealing device 3 for sealing the cut plastic packaging bag film and a material taking and placing device 4 are also arranged on the operation table 1; in the actual in-process of making to degradable plastic packaging bag, through the setting of fixed cutting device 2, can be faster cut the wrapping bag film, rethread banding device 3 carries out the banding operation to the wrapping bag film after cutting, and can adjust the thickness of banding, and the practicality of improving device, the degradable plastic packaging bag that will seal the edge and accomplish at last gets through the material and put device 4 and collect can. The operation is convenient and fast, and the convenience of actual operation is improved.

Referring to fig. 3, the fixed cutting device 2 includes a fixed cylinder 21, a plug-in post 22, a fixed frame 23, a driving gear 24, a driving belt 25, a driving motor 26, a cutting cylinder 27, a cutting knife 28 and a height adjusting device 5; in this embodiment, two fixed cylinders 21 are provided and fixedly installed above the operating platform 1, and the insertion posts 22 are inserted and slid in the fixed cylinders 21 and extend toward the operating platform 1; the fixing frame 23 is fixedly installed at the end part of the splicing column 22 and extends along the width direction of the operating platform 1, the driving gears 24 are rotatably installed at one side of the fixing frame 23 close to the operating platform 1, the driving belt 25 is sleeved between the two driving gears 24, the driving motor 26 is arranged on the fixing frame 23 and drives the driving gears 24 to rotate, and a passing space 6 for the packaging bag film to pass through is formed between the driving belt 25 and the operating platform 1; the height adjusting device 5 is arranged between the fixed cylinder 21 and the inserting column 22 to adjust the height between the fixed cylinder 21 and the inserting column 22; in the actual operation process, the plastic packaging film is placed in the passing space 6, the driving belt 25 is driven to move downwards through the height adjusting device 5 to compress the plastic packaging film, and the driving motor 26 is started to drive the driving belt 25 to rotate; the cutting cylinder 27 is arranged above the operating platform 1, extends towards the table top of the operating platform 1 and is positioned between the two fixed cylinders 21, and the cutting knife 28 is fixedly arranged and used for cutting the end part of the cylinder 27 so as to cut the packaging bag film; in actual operation, the cutting blade 28 is moved downward by the control of the cutting cylinder 27 to cut the plastic packaging film by the cutting blade 28, and the plastic film can be continuously cut, further improving the convenience of actual operation.

Referring to fig. 4, the height adjusting device 5 includes a first threaded rod 51, a second threaded rod 52, a threaded sleeve 53, a stopper 54, a stopper groove 55, and a through groove 56; in this embodiment, first threaded rod 51 fixed mounting is at the bottom of the fixed section of thick bamboo 21, second threaded rod 52 fixed mounting is in the one end that grafting post 22 is close to fixed section of thick bamboo 21, stopper 54 is integrative to be located on grafting post 22, spacing groove 55 is seted up fixed section of thick bamboo 21 inboard and is slided spacingly with stopper 54, the thread bush 53 both ends screw thread is installed on first threaded rod 51 and second threaded rod 52, and the screw thread opposite direction of first threaded rod 51 and second threaded rod 52, wear to establish groove 56 and set up on fixed section of thick bamboo 21 lateral wall and communicate the setting each other with fixed section of thick bamboo 21 inner chamber. In the actual operation process, the insertion column 22 and the fixed cylinder 21 can slide up and down without relative rotation through the matching between the limit block 54 and the limit groove 55; because the thread directions of the first threaded rod 51 and the second threaded rod 52 are opposite, namely, an operator only needs to pass through the through groove 56 to rotate the thread sleeve 53, the first threaded rod 51 and the second threaded rod 52 can be controlled to be close to or far away from each other, and therefore the distance between the driving belt 25 and the operating platform 1 is controlled to compress plastic bag films with different thicknesses; the whole operation process is convenient and fast, and the convenience of actual operation can be improved.

As shown in fig. 4, in order to adjust the height of the driving belt 25 more conveniently and accurately, a display scale 521 for displaying the height of the driving belt 25 is disposed on the second threaded rod 52, and a corresponding line 211 matched with the display scale 521 is disposed on the fixed cylinder 21. That is, in the process of actual operation, when the operator carries out limiting operation on the mounting frame through the mounting plate, the height from the driving belt 25 to the operating platform 1 can be conveniently and quickly known only by observing the positions of the corresponding line 211 and the display scale 521.

Referring to fig. 5, the edge banding device 3 includes a conveying frame 31, a receiving plate 32, an edge banding frame 33, a driving cylinder 34, a pushing rod 35, a fixing frame 36, a stress block 37, a supporting compression spring 38, a connecting compression spring 39 and a heating extrusion block 310; in this embodiment, the conveying frame 31 is disposed on the operation table 1 and below the driving belt 25, the conveying frame 31 is perpendicular to the operation table 1, the receiving plate 32 is fixedly mounted on the conveying frame 31 to receive the cut packaging bag film, and when the packaging bag film is cut by the fixing and cutting device 2, the packaging bag film is moved to the conveying frame 31 and is received by the receiving plate 32; the edge sealing frame 33 is fixedly arranged on the bearing plate 32, the fixing frame 36 is slidably arranged on the inner side of the edge sealing frame 33 and is positioned above the bearing plate 32, the stress block 37 is arranged above the fixing frame 36 along one side of the length direction of the fixing frame 36, and the number of the stress blocks 37 can be adjusted and controlled according to actual conditions; the supporting compression spring 38 is arranged between the stress block 37 and the fixing frame 36 to manufacture the stress block 37, the connecting compression spring 39 is arranged in the middle of the lower side edge of the stress block 37, the heating extrusion block 310 is arranged at one end, far away from the stress block 37, of the connecting compression spring 39, the driving cylinder 34 is fixedly arranged on the side edge of the edge sealing frame 33 and located above the stress block 37, and the push rod 35 is fixedly arranged at the end part of the driving cylinder 34 and is in sliding contact with the stress block 37; when actually carrying out the banding operation to the wrapping bag film after cutting, only need open drive cylinder 34, drive catch bar 35 round trip movement through drive cylinder 34, at catch bar 35 round trip movement's in-process, can promote atress piece 37 downwards, can drive heating extrusion piece 310 downstream when atress piece 37 downstream until with wrapping bag film contact in order to carry out the banding with the wrapping bag film of multilayer fixed, and when catch bar 35 continues the downstream, atress piece 37 also can continue the downstream simultaneously, connect the effect seat effect on the pressure spring 39 this moment on the heating extrusion piece 310, make more abundant to wrapping bag banding film, improve actual banding effect.

Referring to fig. 6, the sealing edge thicknesses of the film of the packaging bag are different due to different materials, and a sliding connection device 7 is arranged between a fixing frame 36 and a sealing frame 33 so as to realize the difference of the sealing edge thicknesses; in this embodiment, the sliding connection device 7 includes a sliding block 71, a sliding groove 72, an upper driving rod 73, a lower driving rod 74, a fixing block 75, and a contact rod 76; fixed block 75 fixed mounting is in the surface of banding frame 33, go up drive lever 73 and the equal threaded mounting of lower drive lever 74 on fixed block 75 and both sides about just facing respectively, it has the regulation pole 77 with last drive lever 73 and lower drive lever 74 threaded connection still to have threaded connection on the fixed block 75, sliding block 71 is integrative to be located on fixed frame 36, sliding groove 72 is seted up on banding frame 33 and is supplied sliding block 71 to insert and establish the slip, touch bar 76 passes through connecting device 8 slidable mounting in the one end that last drive lever 73 and lower drive lever 74 kept away from each other, the one end that fixed block 75 was kept away from to two touch bars 76 rotates with sliding block 71 to be connected. In the actual operation process, only the adjusting rod 77 needs to be rotated, the upper driving rod 73 and the lower driving rod 74 are moved away from each other through the rotation of the adjusting rod 77, when the upper driving rod 73 and the lower driving rod 74 are away from each other, the angle of the two contact rods 76 is increased, one ends, away from the fixed block 75, of the two contact rods 76, namely the positions of the sliding blocks 71 are moved to the positions of the fixed block 75, so that the fixed frame 36 is controlled to move towards the fixed block 75, the edge sealing thickness is reduced, and otherwise, the edge sealing thickness is increased.

Referring to fig. 7, the connection device 8 includes an installation cover 81, a connection rod 82, an arc-shaped groove 83 and a connection ball 84, the installation cover 81 covers the end portions of the upper driving rod 73 and the lower driving rod 74, the arc-shaped groove 83 is disposed on one side of the installation cover 81 close to the upper driving rod 73 or the lower driving rod 74, a through groove communicated with the arc-shaped groove 83 is reserved between the installation cover 81 and the upper driving rod 73 or the lower driving rod 74, the connection rod 82 is integrally disposed at one end of the touch bar 76 close to the fixed block 75 and inserted into the through groove to slide, and the connection ball 84 is integrally disposed at one end of the touch bar 76 close to the fixed block 75 and slides in the arc-shaped.

Referring to fig. 8, the material taking and placing device 4 includes a rotating motor 41, a rotating rod 42, an adsorption plate 43, a telescopic cylinder 44 and a collecting frame 45, the rotating motor 41 is fixedly installed on the conveying frame 31, the rotating rod 42 is fixed on an output shaft of the rotating motor 41, the telescopic flag rod is arranged on the rotating rod 42 and extends downwards, and the adsorption plate 43 is fixedly installed at an end portion of the telescopic cylinder 44; during actual operation, conveying frame 31 removes the degradable wrapping bag that the banding was accomplished after, moves to degradable wrapping bag position department through rotating motor 41 control telescopic cylinder 44, reopens telescopic cylinder 44 and adsorbs degradable wrapping bag through adsorption disc 43, again with degradable wrapping bag shift to collect in frame 45 can.

Referring to fig. 1, the method for manufacturing the degradable plastic packaging bag by using the degradable plastic packaging bag production equipment comprises the following steps:

s1: extruding and cutting, namely cutting the extruded packaging bag film according to the required size through a fixed cutting device 2 after the packaging bag film is extruded through an extruder;

s2: transferring a blank holder, performing blank holder forming on the packaging bag film subjected to cutting in the step 1 through a blank holder device 3, and adjusting the position of the blank holder device 3 to change the width of the blank holder;

s3: transferring and placing, namely transferring the degradable plastic packaging bag after edge sealing is finished into a mobile phone frame through a material taking and placing device 4;

s4: and (5) centralized transportation, namely performing centralized collection and centralized transportation on the degradable plastic packaging bags in the collection frame 45.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A manufacturing method of a degradable plastic packaging bag uses a degradable plastic packaging bag production device, and is characterized in that: the equipment comprises an operation table (1), wherein a fixing and cutting device (2) for fixing and cutting the plastic packaging bag film is arranged on the operation table (1), and a side sealing device (3) for sealing the cut plastic packaging bag film and a material taking and placing device (4) are also arranged on the operation table (1), wherein the material taking and placing device is arranged on the operation table (1);

the fixed cutting device (2) comprises a fixed cylinder (21), an inserting column (22), a fixed frame (23), a driving gear (24), a driving belt (25), a driving motor (26), a cutting cylinder (27), a cutting knife (28) and a height adjusting device (5), wherein the fixed cylinder (21) is provided with two parts which are fixedly arranged above the operating platform (1), the inserting column (22) is inserted and slid in the fixed cylinder (21) and extends towards the operating platform (1), the height adjusting device (5) is arranged between the fixed cylinder (21) and the inserting column (22) to adjust the height between the fixed cylinder (21) and the inserting column (22), the fixed frame (23) is fixedly arranged at the end part of the inserting column (22) and extends along the width direction of the operating platform (1), the driving gear (24) is rotatably arranged at one side of the fixed frame (23) close to the operating platform (1), the packaging bag film cutting machine is characterized in that the driving belt (25) is sleeved between the two driving gears (24), the driving motor (26) is arranged on the fixing frame (23) and drives the driving gears (24) to rotate, a passing space (6) for a packaging bag film to pass is formed between the driving belt (25) and the operating platform (1), the cutting cylinder (27) is arranged above the operating platform (1), extends towards the table top of the operating platform (1) and is located between the two fixing cylinders (21), and the end part of the cutting cylinder (27) is fixedly installed to cut the packaging bag film;

the edge sealing device (3) comprises a conveying frame (31), a bearing plate (32), an edge sealing frame (33), a driving cylinder (34), a push rod (35), a fixing frame (36), a stress block (37), a supporting pressure spring (38), a connecting pressure spring (39) and a heating extrusion block (310), wherein the conveying frame (31) is arranged on the operating platform (1) and is positioned below the driving belt (25), the bearing plate (32) is fixedly arranged on the conveying frame (31) to bear a packaging bag film after cutting, the edge sealing frame (33) is fixedly arranged on the bearing plate (32), the fixing frame (36) is slidably arranged on the inner side of the edge sealing frame (33) and is positioned above the bearing plate (32), the stress block (37) is arranged above the fixing frame (36) along one side of the length direction of the fixing frame (36), the supporting pressure spring (38) is arranged between the stress block (37) and the fixing frame (36) to manufacture the stress block (37), the connecting pressure spring (39) is arranged in the middle of the lower side edge of the stress block (37), the heating extrusion block (310) is arranged at one end, far away from the stress block (37), of the connecting pressure spring (39), the driving cylinder (34) is fixedly arranged on the side edge of the edge sealing frame (33) and located above the stress block (37), and the push rod (35) is fixedly arranged at the end part of the driving cylinder (34) and is in sliding contact with the stress block (37);

the material taking and placing device (4) comprises a rotating motor (41), a rotating rod (42), an adsorption disc (43), a telescopic cylinder (44) and a collecting frame (45), wherein the rotating motor (41) is fixedly arranged on the conveying frame (31), the rotating rod (42) is fixed on an output shaft of the rotating motor (41), the telescopic cylinder (44) is arranged on the rotating rod (42) and extends downwards, and the adsorption disc (43) is fixedly arranged at the end part of the telescopic cylinder (44);

s1: extruding and cutting, namely cutting the extruded packaging bag film according to the required size through a fixed cutting device (2) after the packaging bag film is extruded through an extruder;

s2: transferring a blank holder, performing blank holder forming on the packaging bag film subjected to cutting in the step 1 through a blank holder device (3), and adjusting the position of the blank holder device (3) to change the width of the blank holder;

s3: transferring and placing, namely transferring the degradable plastic packaging bag after edge sealing is finished into a mobile phone frame through a material taking and placing device (4);

s4: and (4) centralized transportation, namely performing centralized collection and centralized transportation on the degradable plastic packaging bags in the collection frame (45).

2. The method of claim 1, wherein the method comprises the steps of: the height adjusting device (5) comprises a first threaded rod (51), a second threaded rod (52), a threaded sleeve (53), a limiting block (54), a limiting groove (55) and a penetrating groove (56), the first threaded rod (51) is fixedly arranged at the bottom of the fixed cylinder (21), the second threaded rod (52) is fixedly arranged at one end of the insertion column (22) close to the fixed cylinder (21), the limiting block (54) is integrally arranged on the inserting column (22), the limiting groove (55) is arranged on the inner side of the fixed cylinder (21) and slides and limits with the limiting block (54), two ends of the thread bush (53) are arranged on the first threaded rod (51) and the second threaded rod (52) in a threaded manner, and the first threaded rod (51) and the second threaded rod (52) have opposite thread directions, the through groove (56) is arranged on the side wall of the fixed cylinder (21) and communicated with the inner cavity of the fixed cylinder (21).

3. The method of claim 2, wherein the step of preparing the degradable plastic packaging bag comprises: the second threaded rod (52) is provided with a display scale (521) for displaying the height of the driving belt (25), and the fixed cylinder (21) is provided with corresponding lines (211) matched with the display scale (521).

4. The method of claim 1, wherein the method comprises the steps of: be provided with sliding connection device (7) between fixed frame (36) and banding frame (33), sliding connection device (7) are including sliding block (71), groove (72) that slides, last actuating lever (73), lower actuating lever (74), fixed block (75) and touch-sensitive pole (76) of supporting, fixed block (75) fixed mounting is in banding frame (33) surface, go up actuating lever (73) and lower actuating lever (74) equal threaded mounting on fixed block (75) and respectively towards both sides from top to bottom, go back threaded connection on fixed block (75) and adjust pole (77) with last actuating lever (73) and lower actuating lever (74) threaded connection, sliding block (71) an organic whole is located on fixed frame (36), sliding groove (72) are seted up on banding frame (33) and are supplied sliding block (71) to insert and establish and slide, touch-sensitive pole (76) are through connecting device (8) slidable mounting in a driving lever (73) and lower actuating lever (74) a that keep away from each other And one end of each of the two contact rods (76) far away from the fixed block (75) is rotatably connected with the sliding block (71).

5. The method for making a degradable plastic packaging bag according to claim 4, wherein the method comprises the following steps: connecting device (8) are including installation lid (81), connecting rod (82), arc wall (83) and connection ball (84), installation lid (81) approximately fits actuating lever (73) and actuating lever (74) tip down, arc wall (83) are seted up and are close to one side of actuating lever (73) or actuating lever (74) down in installation lid (81), installation lid (81) and actuating lever (73) perhaps leave the logical groove that communicates each other with arc wall (83) down between actuating lever (74), and connecting rod (82) an organic whole is located to touch bar (76) end and is close to the one end of fixed block (75) and insert and establish and slide in leading to the inslot, connection ball (84) an organic whole is located to touch bar (76) and is close to the one end of fixed block (75) and slides in arc wall (83).