阅读说明：本技术 一种可降解塑料包装袋制备方法 (Preparation method of degradable plastic packaging bag ) 是由 王晓春 于 2020-12-25 设计创作，主要内容包括：本发明提供了一种可降解塑料包装袋制备方法,其使用了一种可降解塑料包装袋制备装置,该可降解塑料包装袋制备装置包括安装板、放膜辊、导向辊、收卷辊、第一电机、支撑盒、干燥盒、按压机构和连接板；本发明中的支撑盒与第二安装板之间的夹角能够随着收卷辊对可降解塑料包装袋收卷膨胀进行动态改变,同时配合平整辊的设计让印刷后的可降解塑料包装袋始终保持平整,防止可降解塑料包装袋发生褶皱,同时本发明中的一对海绵块在往复机构的作用下依次对印刷后的可降解塑料包装袋的油墨处进行按压吸收,避免印刷后的可降解塑料包装袋与海绵块直接摩擦,能够有效地防止印刷后的可降解塑料包装袋的油墨图案发生变化。(The invention provides a preparation method of a degradable plastic packaging bag, which uses a preparation device of the degradable plastic packaging bag, wherein the preparation device of the degradable plastic packaging bag comprises a mounting plate, a film placing roller, a guide roller, a winding roller, a first motor, a support box, a drying box, a pressing mechanism and a connecting plate; the included angle between the support box and the second mounting plate can be dynamically changed along with the rolling expansion of the winding roller on the degradable plastic packaging bag, and meanwhile, the printed degradable plastic packaging bag is kept flat all the time by matching with the design of the leveling roller, so that the degradable plastic packaging bag is prevented from being wrinkled, meanwhile, a pair of sponge blocks in the invention sequentially press and absorb the printing ink of the printed degradable plastic packaging bag under the action of the reciprocating mechanism, the direct friction between the printed degradable plastic packaging bag and the sponge blocks is avoided, and the change of the printing ink pattern of the printed degradable plastic packaging bag can be effectively prevented.)

1. The utility model provides a degradable plastic packaging bag preparation method, its used a degradable plastic packaging bag preparation facilities, this degradable plastic packaging bag preparation facilities includes mounting panel (1), puts membrane roller (2), guide roll (3), wind-up roll (4), first motor (5), supports box (6), dry box (7), pressing means (8) and connecting plate (9), its characterized in that: the specific method for preparing the degradable plastic packaging bag by adopting the degradable plastic packaging bag preparation device is as follows:

s1, printing the degradable plastic packaging bag: winding the semi-finished product of the degradable plastic packaging bag on a film releasing roller (2), sequentially passing the tail end of the degradable plastic packaging bag among a guide roller (3), a support box (6) and a drying box (7), winding the semi-finished product on a winding roller (4), starting a first motor (5) and printing equipment, and allowing the printing roller to print the surface of the semi-finished product of the degradable plastic packaging bag;

s2, flattening and drying the printed surface of the degradable plastic packaging bag: simultaneously starting a second motor (64), enabling the second motor (64) to drive a leveling roller (63) to move in the direction opposite to that of the first motor (15), achieving leveling treatment on the printed degradable plastic packaging bag, enabling a sponge block (72) to absorb redundant printing ink on the surface of the degradable plastic packaging bag, and drying the printing ink by a drying fan (77);

s3, cutting the degradable plastic packaging bag: cutting the degradable plastic packaging bag wound by the winding roller (4) through cutting equipment to finish the preparation of the degradable plastic packaging bag;

wherein, mounting panel (1) includes first mounting panel (11) and second mounting panel (12), second mounting panel (12) are parallel with the horizontal plane, the equal vertical first mounting panel (11) that is equipped with in both sides around second mounting panel (12), two sets of bottom left side between first mounting panel (11) is equipped with puts membrane roller (2), put the front and back both sides center of membrane roller (2) through pivot and two sets of the inner wall of first mounting panel (11) rotates to be connected, two sets of top left side between first mounting panel (11) is equipped with guide roll (3), the front and back both sides center of guide roll (3) is connected through pivot and two sets of the inner wall rotation of first mounting panel (11), two sets of top right side between first mounting panel (11) is equipped with wind-up roll (4), the rear side center of wind-up roll (4) through the pivot with be located the rear side first mounting panel (11) front side surface rotation connection, a first motor (5) is fixedly mounted on the front side surface of the first mounting plate (11) positioned on the front side through a support, a rotating shaft of the first motor (5) penetrates through the front side surface of the first mounting plate (11) and then is fixedly connected with the center of the front side of the winding roller (4), a supporting box (6) is arranged right above the second mounting plate (12), a drying box (7) is arranged right above the supporting box (6), the front side and the rear side of the top of the supporting block (6) are fixedly connected with the front side and the rear side of the bottom of the drying box (7) through connecting plates (9), and pressing mechanisms (8) are arranged on the left side and the right side of the top of the supporting block (6) and the left side and the right side of the bottom of the drying box (7);

the supporting box (6) comprises an installation block (61), a supporting box body (62), a leveling roller (63), a second motor (64), a gear (65), a chain (66), a connecting pipe (67), a movable pipe (68) and a first expansion spring (69), wherein a top inner cavity of the supporting box body (62) is provided with a row of leveling rollers (63) at equal distance from the left right, the front and rear sides of each leveling roller (63) are both penetrated through the front and rear side walls of the supporting box body (62) and then are arranged on the front and rear side outer surfaces of the supporting box body (62), the front and rear sides of each leveling roller (63) are rotatably connected with the center of the gear (65) through a rotating shaft, the gear (65) is arranged on the front and rear side outer surfaces of the supporting box body (62), one row of the gear (65) positioned on the front side of the supporting box body (62) and one row of gear (65) positioned on the rear side of the supporting box body (62) are both in transmission connection through the chain (66), the second motor (64) is fixedly installed on the outer surface of the front side of the supporting box body (62) through a support, the rotating shaft of the second motor (64) is rotatably connected with the center of the gear (65) which is positioned at the leftmost end of the front side of the supporting box body (62), an installation block (61) is arranged at the center of the left side of the top of the second installation plate (12), the front side and the rear side of the installation block (61) are rotatably connected with the center of the left side of the bottom of the supporting box body (62) through rotating shafts, a movable pipe (68) is vertically arranged at the center of the right side of the top of the second installation plate (12), the tail end of the bottom of the movable pipe (68) is rotatably connected with the surface of the top of the second installation plate (12) through rotating shafts, a connecting pipe (67) is sleeved at the top of the movable pipe (68), the front side and the rear side of the tail end of the top of the connecting pipe (, a first telescopic spring (69) is sleeved on the surface of the movable pipe (68), and two ends of the first telescopic spring (69) are respectively and fixedly connected with the periphery of the bottom of the connecting pipe (67) and the periphery of the bottom of the movable pipe (68);

the drying box (7) comprises a drying box body (71), sponge blocks (72), an air outlet (73), a reciprocating mechanism (74), connecting vertical rods (75), connecting transverse rods (76), a drying fan (77), arc-shaped sliding grooves (78), a movable rod (79) and a second telescopic spring (710), wherein the sponge blocks (72) are symmetrically arranged on the left side and the right side of the bottom surface of the drying box body (71), the connecting vertical rods (75) are vertically arranged at the centers of the tops of the two groups of sponge blocks (72), the connecting transverse rod (76) is horizontally arranged at the center of the top of the inner cavity of the drying box body (71), the center of the connecting transverse rod (76) is rotatably connected with the centers of the tops of the front side and the rear side of the drying box body (71) through a rotating shaft, the arc-shaped sliding grooves (78) are formed in the surface of the top of the connecting vertical rods (75), and the tail ends of the left side and the right, the tail ends of the tops of the two groups of connecting vertical rods (75) are vertically sleeved with movable rods (79), the tops of the movable rods (79) are fixedly mounted on the surface of the top of the inner cavity of the drying box body (71), the surface of each movable rod (79) is sleeved with a second telescopic spring (710), two ends of each second telescopic spring (710) are respectively and fixedly connected with the surface of the top of the inner cavity of the drying box body (71) and the tail end of the top of the connecting vertical rod (75), an air outlet (73) is formed in the center of the bottom surface of the drying box body (71), a drying fan (77) is arranged in the center of the inner cavity of the drying box body (71), and a reciprocating mechanism (74) is arranged in the inner cavity of the drying box body (71);

the reciprocating mechanism (74) comprises a third motor (741), a disc (742), a bump (743), a connecting plate (744), a slot (745), a gear (746) and a rack (747), the third motor (741) is fixedly mounted on the outer surface of the rear side of the drying box body (71) through a bracket, the rack (747) is vertically arranged on the right side surface of the connecting vertical rod (75) on the right side of the inner cavity of the drying box body (71), the right side surface of the rack (747) is meshed with the gear (746), the right center of the gear (746) is horizontally connected with the connecting plate (744), the center of the joint of the gear (746) and the connecting plate (744) is rotatably connected with the inner walls of the front side and the rear side of the drying box body (71) through a rotating shaft, the slot (745) is horizontally chiseled on the surface of the connecting plate (744), the disc (742) is arranged on the inner surface of the rear side of the, the rear center of the disc (742) is fixedly connected with a rotating shaft of the third motor (741), a projection (743) is arranged on the front side surface of the disc (742), and the projection (743) is located in the slot (745).

2. The method for preparing a degradable plastic packaging bag according to claim 1, wherein the degradable plastic packaging bag comprises the following steps: pressing means (8) include fixed block (81), spout (82), compression roller (83), axis of rotation (84) and third expanding spring (85), support the top of box (6) all around with the bottom of dry box (7) all is equipped with fixed block (81) all around, be located support box (6) top fixed block (81) surface top all around and be located dry box (7) bottom fixed block (81) surface bottom all vertical digging have spout (82), support the top left and right sides of box (6) with the bottom left and right sides of dry box (7) all is equipped with compression roller (83), both sides center all rotates around compression roller (83) and is connected with axis of rotation (84), axis of rotation (84) in proper order with spout (82) sliding connection, spout (82) inner chamber is equipped with third expanding spring (85), the both ends of third expanding spring (85) respectively with the inner wall of spout (82) with axis of rotation (84) ) Is fixed.

3. The method for preparing a degradable plastic packaging bag according to claim 1, wherein the degradable plastic packaging bag comprises the following steps: the outlet of the drying fan (77) is opposite to the air outlet (73).

4. The method for preparing a degradable plastic packaging bag according to claim 1, wherein the degradable plastic packaging bag comprises the following steps: the diameter of the arc-shaped sliding groove (78) is equal to the distance between the connecting cross rod (76) and the connecting position of the two groups of movable rods (79).

5. The method for preparing a degradable plastic packaging bag according to claim 1, wherein the degradable plastic packaging bag comprises the following steps: the direction of rotation of the first electric motor (5) is opposite to the direction of rotation of the second electric motor (64).

6. The method for preparing a degradable plastic packaging bag according to claim 1, wherein the degradable plastic packaging bag comprises the following steps: the support box body (62) and the drying box body (71) are parallel to each other.

Technical Field

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

Background

Due to the degradable characteristic, the degradable plastic packaging bag can reduce the pollution to the environment, can replace a non-degradable plastic packaging bag to be widely applied to daily life, wherein patterns are printed on the surface of the degradable plastic packaging bag according to the requirement of a merchant in the preparation process.

The steps of the degradable plastic packaging bag in the prior art in the preparation process are generally as follows: gluing → hot pressing → printing → cutting, wherein the surface of the degradable plastic packaging bag is generally printed by using special printing equipment during the printing process, then the winding roller is used for winding the printed degradable plastic packaging bag, however, the winding mechanism can expand when continuously winding the degradable plastic packaging bag, so that the included angle between a section of the degradable plastic packaging bag between the printing roller and the winding roller and the workbench is changed to gradually keep away from the surface of the workbench, the degradable plastic packaging bag is wrinkled, and the subsequent cutting treatment is influenced, in addition, the printing ink on the surface of the degradable plastic packaging bag after being printed is fully air-dried, so that the printing ink on the surface of the degradable plastic packaging bag after being rolled can be adhered to the surface of the degradable plastic packaging bag in contact with the degradable plastic packaging bag, and the printed patterns are changed.

Disclosure of Invention

In order to achieve the purpose, the invention adopts the following technical scheme that a degradable plastic packaging bag preparation method uses a degradable plastic packaging bag preparation device, the degradable plastic packaging bag preparation device comprises a mounting plate, a film placing roller, a guide roller, a winding roller, a first motor, a supporting box, a drying box, a pressing mechanism and a connecting plate, and the degradable plastic packaging bag preparation method by adopting the degradable plastic packaging bag preparation device comprises the following specific steps:

s1, printing the degradable plastic packaging bag: the tail end of the packaging bag sequentially passes through the guide roller, the supporting box and the drying box and then is wound on the winding roller, and the first motor and the printing equipment are started to enable the printing roller to print the surface of the semi-finished product of the degradable plastic packaging bag;

s2, flattening and drying the printed surface of the degradable plastic packaging bag: simultaneously starting a second motor, driving the leveling roller to move in the direction opposite to that of the first motor by the second motor, leveling the printed degradable plastic packaging bag, absorbing redundant printing ink on the surface of the degradable plastic packaging bag by the sponge block, and drying the printing ink by the drying fan;

s3, cutting the degradable plastic packaging bag: cutting the degradable plastic packaging bag wound by the winding roller through cutting equipment to finish the preparation of the degradable plastic packaging bag;

wherein, the mounting panel includes first mounting panel and second mounting panel, the second mounting panel is parallel with the horizontal plane, the equal vertical first mounting panel that is equipped with in both sides around the second mounting panel, two sets of bottom left side between the first mounting panel is equipped with puts the membrane roller, put the membrane roller around the both sides center through pivot and two sets of the inner wall rotation of first mounting panel is connected, two sets of top left side between the first mounting panel is equipped with the guide roll, the front and back both sides center of guide roll is connected through pivot and two sets of the inner wall rotation of first mounting panel, two sets of top right side between the first mounting panel is equipped with the wind-up roll, the rear side center of wind-up roll is connected through pivot and the rotation of the surface of surface before the first mounting panel that is located the rear side, the surface is located the front side before the first mounting panel through support fixed mounting have first motor, a rotating shaft of the first motor penetrates through the front side surface of the first mounting plate and then is fixedly connected with the center of the front side of the winding roller, a supporting box is arranged right above the second mounting plate, a drying box is arranged right above the supporting box, the front side and the rear side of the top of the supporting block and the front side and the rear side of the bottom of the drying box are fixedly connected through connecting plates, and the left side and the right side of the top of the supporting block and the left side and the right side of the bottom of the drying box are respectively provided with a pressing mechanism;

the supporting box comprises an installation block, a supporting box body, a leveling roller, a second motor, gears, chains, connecting pipes, a movable pipe and a first telescopic spring, wherein a row of leveling rollers are arranged in an inner cavity at the top of the supporting box body in a left-right equidistant mode, the centers of the front side and the rear side of each leveling roller penetrate through the side walls of the front side and the rear side of the supporting box body and are arranged on the outer surfaces of the front side and the rear side of the supporting box body, the centers of the front side and the rear side of each leveling roller are connected with the center of each gear in a rotating mode through rotating shafts, the gears are arranged on the outer surfaces of the front side and the rear side of the supporting box body, one row of gears at the front side of the supporting box body and one row of gears at the rear side of the supporting box body are connected through chain transmission, the second motor is fixedly installed on the outer surface of the front side of the supporting box body through a support, and the rotating, the center of the left side of the top of the second mounting plate is provided with a mounting block, the front side and the rear side of the mounting block are rotatably connected with the center of the left side of the bottom of the support box body through a rotating shaft, the center of the right side of the top of the second mounting plate is vertically provided with a movable pipe, the bottom end of the movable pipe is rotatably connected with the surface of the top of the second mounting plate through a rotating shaft, the top of the movable pipe is sleeved with a connecting pipe, the front side and the rear side of the top end of the connecting pipe are rotatably connected with the center of the right side of the bottom of the mounting block through a rotating shaft, the surface of the movable pipe is sleeved with a first telescopic spring, and two ends of the first telescopic spring are respectively fixedly connected with;

the drying box comprises a drying box body, sponge blocks, air outlets, a reciprocating mechanism, connecting vertical rods, connecting transverse rods, a drying fan, arc-shaped sliding grooves, movable rods and second telescopic springs, wherein the sponge blocks are symmetrically arranged on the left side and the right side of the bottom surface of the drying box body, the connecting vertical rods are vertically arranged at the top centers of the two groups of sponge blocks, the connecting transverse rods are horizontally arranged at the top center of the inner cavity of the drying box body, the centers of the connecting transverse rods are rotatably connected with the top centers of the front side and the rear side of the drying box body through rotating shafts, the arc-shaped sliding grooves are drilled on the top surfaces of the connecting vertical rods, the tail ends of the left side and the right side of the connecting transverse rods are sequentially and slidably connected with the two groups of arc-shaped sliding grooves, the movable rods are vertically sleeved on the tail ends of the top of the, a second telescopic spring is sleeved on the surface of the movable rod, two ends of the second telescopic spring are respectively and fixedly connected with the top surface of the inner cavity of the drying box body and the top end of the connecting vertical rod, an air outlet is formed in the center of the bottom surface of the drying box body, a drying fan is arranged in the center of the inner cavity of the drying box body, and a reciprocating mechanism is arranged in the inner cavity of the drying box body;

reciprocating mechanism includes third motor, disc, lug, connecting plate, fluting, gear and rack, the third motor passes through support fixed mounting and is in the rear side surface of dry box body is located dry box body inner chamber right side connect the vertical rack that is equipped with in montant right side surface, the right side surface of rack with gear intermeshing, the right side center horizontally connected of gear has the connecting plate, the gear with the junction center of connecting plate through the pivot with dry box body's front and back both sides inner wall rotates to be connected, the surface horizontal chisel of connecting plate has the fluting, the rear side internal surface of dry box body is equipped with the disc, the rear side center of disc with the axis of rotation fixed connection of third motor, the preceding side surface of disc is equipped with the lug, the lug is located in the fluting.

Preferably; pressing means includes fixed block, spout, compression roller, axis of rotation and third expanding spring, support the top of box all around with the bottom of dry box all is equipped with the fixed block all around, is located to support box top fixed block surface top all around and is located the equal vertical excavation of dry box bottom fixed block surface bottom all around, support the top left and right sides of box with the bottom left and right sides of dry box all is equipped with the compression roller, the both sides center all rotates around the compression roller and is connected with the axis of rotation, the axis of rotation in proper order with spout sliding connection, the spout inner chamber is equipped with the third expanding spring, the both ends of third expanding spring respectively with the inner wall of spout with the outside fixed surface of axis of rotation.

Preferably; the outlet of the drying fan is opposite to the air outlet.

Preferably; the diameter of the arc-shaped sliding groove is equal to the distance between the connecting cross rod and the connecting positions of the two groups of movable rods.

Preferably; the first motor is rotated in a direction opposite to the direction of rotation of the second motor.

Preferably; the support box body and the drying box body are parallel to each other.

Has the advantages that:

an included angle between the support box and the second mounting plate can be dynamically changed along with the rolling expansion of the winding roller on the degradable plastic packaging bag, the printed degradable plastic packaging bag is kept flat all the time by matching with the design of the leveling roller, the degradable plastic packaging bag is prevented from wrinkling, meanwhile, a pair of sponge blocks in the invention sequentially press and absorb ink of the printed degradable plastic packaging bag under the action of a reciprocating mechanism, the direct friction between the printed degradable plastic packaging bag and the sponge blocks is avoided, and the ink of the printed degradable plastic packaging bag can be air-dried by matching with a drying fan, so that the change of the ink pattern of the printed degradable plastic packaging bag can be effectively prevented

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a flow chart of the operation of the present invention;

FIG. 2 is a front sectional view of a degradable plastic packing bag making apparatus according to the present invention;

FIG. 3 is a top view of the center stay box;

FIG. 4 is a front view of the support box;

FIG. 5 is a bottom view of the drying box;

FIG. 6 is a schematic view of the internal structure of the drying box;

FIG. 7 is an enlarged schematic view of A in FIG. 2;

FIG. 8 is an enlarged schematic view of B of FIG. 6;

FIG. 9 is an enlarged schematic view of C in FIG. 6;

fig. 10 is a perspective view of the mounting plate.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. In this process, the width of the lines or the size of the components in the drawings may be exaggerated for clarity and convenience of description.

The following terms are defined based on the functions of the present invention, and may be different depending on the intention of the user or the operator or the convention. Therefore, these terms are defined based on the entire contents of the present specification.

As shown in fig. 1 to 10, a method for preparing a degradable plastic packaging bag uses a device for preparing a degradable plastic packaging bag, which comprises a mounting plate 1, a film placing roller 2, a guide roller 3, a winding roller 4, a first motor 5, a supporting box 6, a drying box 7, a pressing mechanism 8 and a connecting plate 9, and the method for preparing a degradable plastic packaging bag by using the device for preparing a degradable plastic packaging bag is as follows:

s1, printing the degradable plastic packaging bag: winding the semi-finished product of the degradable plastic packaging bag on a film releasing roller 2, sequentially passing the tail end of the degradable plastic packaging bag among a guide roller 3, a supporting box 6 and a drying box 7, then winding the semi-finished product on a winding roller 4, starting a first motor 5 and printing equipment, and allowing the printing roller to print the surface of the semi-finished product of the degradable plastic packaging bag;

s2, flattening and drying the printed surface of the degradable plastic packaging bag: meanwhile, the second motor 64 is started, the second motor 64 drives the leveling roller 63 to move in the direction opposite to the direction of the first motor 15, the printed degradable plastic packaging bag is leveled, meanwhile, the sponge block 72 can absorb redundant ink on the surface of the degradable plastic packaging bag, and the drying fan 77 dries the ink;

s3, cutting the degradable plastic packaging bag: cutting the degradable plastic packaging bags wound by the winding roller 4 through cutting equipment to finish the preparation of the degradable plastic packaging bags;

wherein, the mounting panel 1 includes first mounting panel 11 and second mounting panel 12, second mounting panel 12 is parallel with the horizontal plane, the equal vertical first mounting panel 11 that is equipped with in both sides around the second mounting panel 12, bottom left side between two sets of first mounting panels 11 is equipped with puts membrane roller 2, it rotates through the pivot and the inner wall of two sets of first mounting panels 11 to put the front and back both sides center of membrane roller 2 and be connected, top left side between two sets of first mounting panels 11 is equipped with guide roll 3, the front and back both sides center of guide roll 3 rotates through the pivot and is connected with the inner wall of two sets of first mounting panels 11, top right side between two sets of first mounting panels 11 is equipped with wind-up roll 4, the rear side center of wind-up roll 4 rotates through the pivot and is connected with the first mounting panel 11 front side surface that is located the rear side, first mounting panel 11 front side surface that is located the front side passes through support fixed mounting has first motor 5, the axis of first motor 5 runs through behind the front side surface A supporting box 6 is arranged right above the second mounting plate 12, a drying box 7 is arranged right above the supporting box 6, the front side and the rear side of the top of the supporting block 6 are fixedly connected with the front side and the rear side of the bottom of the drying box 7 through connecting plates 9, and the left side and the right side of the top of the supporting block 6 and the left side and the right side of the bottom of the drying box 7 are respectively provided with a pressing mechanism 8;

the supporting box 6 comprises a mounting block 61, a supporting box body 62, a leveling roller 63, a second motor 64, a gear 65, a chain 66, a connecting pipe 67, a movable pipe 68 and a first expansion spring 69, wherein a row of leveling rollers 63 are equidistantly arranged in the top inner cavity of the supporting box body 62 from left to right, the centers of the front and rear sides of each leveling roller 63 penetrate through the side walls of the front and rear sides of the supporting box body 62 and are arranged on the outer surfaces of the front and rear sides of the supporting box body 62, the centers of the front and rear sides of each leveling roller 63 are rotatably connected with the center of the gear 65 through a rotating shaft, the gears 65 are arranged on the outer surfaces of the front and rear sides of the supporting box body 62, the row of gears 65 on the front side of the supporting box body 62 and the row of gears 65 on the rear side of the supporting box body 62 are in transmission connection through the chain 66, the second motor 64 is fixedly arranged on the outer surface of the front side of the supporting box body 62 through a bracket, the center of the left side of the top of the second mounting plate 12 is provided with a mounting block 61, the front side and the rear side of the mounting block 61 are rotatably connected with the center of the left side of the bottom of the support box body 62 through a rotating shaft, the center of the right side of the top of the second mounting plate 12 is vertically provided with a movable tube 68, the bottom end of the movable tube 68 is rotatably connected with the surface of the top of the second mounting plate 12 through a rotating shaft, the top of the movable tube 68 is sleeved with a connecting tube 67, the front side and the rear side of the top end of the connecting tube 67 are rotatably connected with the center of the right side of the bottom of the mounting block 61 through a rotating shaft, the surface of the movable tube 68 is sleeved with a first expansion spring 69, and two ends;

the drying box 7 comprises a drying box body 71, sponge blocks 72, an air outlet 73, a reciprocating mechanism 74, connecting vertical rods 75, connecting cross rods 76, a drying fan 77, arc-shaped sliding grooves 78, movable rods 79 and a second telescopic spring 710, wherein the supporting box body 62 and the drying box body 71 are parallel to each other, the sponge blocks 72 are symmetrically arranged on the left side and the right side of the bottom surface of the drying box body 71, the connecting vertical rods 75 are vertically arranged at the centers of the tops of the two groups of sponge blocks 72, the connecting cross rods 76 are horizontally arranged at the center of the top of an inner cavity of the drying box body 71, the centers of the connecting cross rods 76 are rotatably connected with the centers of the front side and the rear side of the drying box body 71 through rotating shafts, the arc-shaped sliding grooves 78 are drilled on the top surface of the connecting vertical rods 75, the tail ends of the left side and the right side of the connecting cross rods 76 are sequentially connected with, the tail ends of the tops of the two groups of connecting vertical rods 75 are vertically sleeved with the movable rods 79, the tops of the movable rods 79 are fixedly installed on the top surface of the inner cavity of the drying box body 71, the surface of the movable rods 79 is sleeved with the second telescopic spring 710, two ends of the second telescopic spring 710 are respectively and fixedly connected with the top surface of the inner cavity of the drying box body 71 and the tail ends of the tops of the connecting vertical rods 75, the center of the bottom surface of the drying box body 71 is provided with an air outlet 73, the center of the inner cavity of the drying box body 71 is provided with a drying fan 77, an outlet of the drying fan 77 faces the air outlet 73, and the inner cavity of the drying;

the reciprocating mechanism 74 comprises a third motor 741, a disk 742, a bump 743, a connecting plate 744, a slot 745, a gear 746 and a rack 747, the third motor 741 is fixedly mounted on the outer surface of the rear side of the drying box body 71 through a bracket, the rack 747 is vertically arranged on the right side surface of a connecting vertical rod 75 located on the right side of the inner cavity of the drying box body 71, the right side surface of the rack 747 is meshed with the gear 746, the connecting plate 744 is horizontally connected to the right side center of the gear 746, the center of the connection between the gear 746 and the connecting plate 744 is rotatably connected to the inner walls of the front and rear sides of the drying box body 71 through a rotating shaft, the slot 745 is horizontally chiseled on the surface of the connecting plate 744, the disk 742 is arranged on the inner surface of the rear side of the drying box body 71, the center of the rear side of the disk 742 is fixedly connected;

pressing mechanism 8 includes fixed block 81, spout 82, compression roller 83, axis of rotation 84 and third expanding spring 85, the top of supporting box 6 all is equipped with fixed block 81 all around with the bottom of dry box 7, be located and support box 6 top fixed block 81 surface top all around and be located the equal vertical drilling in fixed block 81 surface bottom all around of dry box 7 bottom and have spout 82, the top left and right sides of supporting box 6 and the bottom left and right sides of dry box 7 all are equipped with compression roller 83, compression roller 83 all rotates in the front and back both sides center and is connected with axis of rotation 84, axis of rotation 84 in proper order with spout 82 sliding connection, the spout 82 inner chamber is equipped with third expanding spring 85, the both ends of third expanding spring 85 respectively with the inner wall of spout 82 and the outside fixed surface of axis of rotation 84.

When the degradable plastic packaging bags are printed, the winding roller 4 winds the degradable plastic packaging bags, the winding roller 4 gradually expands, so that the included angle between the degradable plastic packaging bags between the printing roller and the winding roller 4 and the second mounting plate 12 is gradually increased, at the moment, the first expansion spring 69 enables the connecting pipe 67 to slide upwards along the movable pipe 68, the included angle between the supporting box 6 and the second mounting plate 12 is gradually increased, the degradable plastic packaging bags after printing are always positioned on the surface of the supporting box body 62, and due to the fact that the rotation direction of the second motor 64 is opposite to that of the first motor 5, when the chain 66 can drive all the gears 65 to synchronously rotate, the leveling roller 63 can level the back surfaces of the degradable plastic packaging bags, and wrinkles are prevented; when the third motor 741 runs, the third motor 741 drives the disc 742 to perform circular motion along the center of the circle, so that the protrusion 743 drives the slot 745 to swing on the surface of the disc 742, the gear 746 is an arc-shaped residual gear, the gear 746 can synchronously swing up and down along the vertical plane at the moment, the gear 746 drives the rack 747 to move up and down, so that the rack 747 drives the connecting vertical rod 75 on the right side to perform intermittent motion up and down, and meanwhile, the connecting vertical rod 75 on the left side and the connecting vertical rod 75 on the right side synchronously move in opposite directions under the action of the connecting cross rod 76, so that the sponge block 72 can absorb ink on the printing surface of the degradable plastic packaging bag.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.