A bag-making process for a double-layer bag with patterns

Abstract

The present invention discloses a process for manufacturing a double-layer bag with patterns, which comprises the following steps: 1) inputting an upper film and a lower film; 2) combining the upper film and the lower film, during which the positions of the upper film and the lower film are corrected. Patterns are printed on both the upper film and the lower film, and through the correction, the patterns on the upper film and the lower film are overlapped; 3) heat-sealing the bottom edge of the combined film; 4) heat-sealing the side edges of the combined film; 5) trimming the waste edges of the combined film; 6) cutting the rounded corners of the combined film; 7) cutting the combined film into bags. Through such a bag-making process, the patterns on the upper film and the lower film can be overlapped and aligned, ensuring the bag-making precision of the bag body.

Description

Technical Field

[0001] The present invention relates to a process for manufacturing a double-layer bag with patterns. Background Art

[0002] In the existing manufacturing of double-layer bags, if the upper film and the lower film of the bag body have patterns with the same shape, it is necessary to overlap and align the patterns on the upper film and the lower film. However, the existing film material deviation correction often uses a single roller for adjustment, resulting in low adjustment efficiency. The prior art of heat stamping urgently needs a process for manufacturing a double-layer bag with patterns that has high deviation correction efficiency and is easy to operate. Summary of the Invention

[0003] The object of the present invention is to overcome the defects existing in the prior art and provide a process for manufacturing a double-layer bag with patterns that has high deviation correction efficiency and is easy to operate.

[0004] To achieve the above object, the technical solution of the present invention provides a process for manufacturing a double-layer bag with patterns, including the following steps:

[0005] 1). Input the upper film and the lower film;

[0006] 2). Combine the upper film and the lower film. During the film combination process, correct the positions of the upper film and the lower film. Patterns are printed on both the upper film and the lower film. Through deviation correction, the patterns on the upper film and the lower film are overlapped;

[0007] 3). Heat-seal the bottom edge of the combined film;

[0008] 4). Heat-seal the side edges of the combined film;

[0009] 5). Cut off the waste edges of the combined film;

[0010] 6). Cut the rounded corners of the combined film;

[0011] 7). Cut the combined film into bags.

[0012] Through such a bag-making process, the patterns on the upper film and the lower film can be overlapped and aligned, ensuring the bag-making accuracy of the bag body.

[0013] Preferably, the input of the upper film in step 1) is completed through an upper film input component. The upper film input component includes an upper film material roll around which the upper film is sequentially wound, an upper film guide roller group, an upper film constant tension swing arm roller group cooperating with the upper film guide roller group, an upper film transition roller, an upper film unwinding roller group, an upper film storage swing arm roller, and an upper film combination guide roller.

[0014] Through such an upper film input component, the upper film can be guided to the upper film combination position.

[0015] Preferably, the input component of the upper film (1) includes a lateral edge adjustment sensor (15) for the upper film. The lateral edge adjustment sensor (15) cooperates with the outer edge of the upper film (1) for detection. At least one laterally movable lateral edge adjustment roller for the upper film (1), or the upper film reel (6), the upper film guiding roller set (7), and the upper film constant tension swing arm roller set (8) move laterally as a whole.

[0016] Through such an upper film edge adjustment mechanism, the upper film has a relatively accurate lateral position before being input to the film combining position, ensuring the accuracy of lateral edge transmission.

[0017] Preferably, the input of the lower film in step 1) is completed through a lower film input component. The lower film input component includes a lower film reel around which the lower film is wound in sequence, a lower film guiding roller set, a lower film constant tension swing arm roller set cooperating with the lower film guiding roller set, a lower film transition roller, a first inclined rod for lower film turning, a first vertical roller for lower film, a vertical roller for lower film unwinding, a second vertical roller for lower film, a second inclined rod for lower film turning, a lower film transition roller, a lower film storage swing arm roller, a lower film transition roller, a lower film servo traction roller set, a lower film transition roller, and a lower film combining guiding roller.

[0018] Through such a lower film input component, the lower film can be guided to the film combining position.

[0019] Preferably, the input component of the lower film (2) includes a vertical deviation correction detection sensor (34). The vertical deviation correction detection sensor (34) cooperates with the outer edge of the lower film (2) for detection. The first vertical roller (23) or the second vertical roller (25) for the lower film can move vertically to adjust the edge of the lower film (2).

[0020] Through such a lower film edge adjustment mechanism, the lower film has a relatively accurate lateral position before being input to the film combining position, ensuring the accuracy of lateral edge transmission.

[0021] Preferably, the combination of the upper film and the lower film in step 2) is achieved through a film combining adjustment roller set. The film combining adjustment roller set includes a parallel upper film combining adjustment roller and a lower film combining adjustment roller, and there is an adjustment gap between the upper film combining adjustment roller and the lower film combining adjustment roller; the upper film is input from the upper film combining adjustment roller, and the lower film is input from the lower film combining adjustment roller and then gradually approaches and contacts to form a combined film; the film combining adjustment roller set can move up and down to adjust the relative positions of the upper film and the lower film before and after.

[0022] Through such an adjustment method, since the upper film and the lower film are adjusted simultaneously, the adjustment efficiency is doubled compared with the movement of a single roller in terms of the front and back adjustment efficiency.

[0023] Preferably, one end of the film combining and adjusting roller group is the horizontal adjustment reference end, and the other end is the horizontal adjustment movable end. The horizontal adjustment movable end rotates around the horizontal adjustment reference end by a small angle to adjust the horizontal relative positions of the upper film and the lower film.

[0024] Through such an adjustment method, since the upper film and the lower film are adjusted simultaneously, the horizontal adjustment efficiency is doubled compared with the movement of a single roller.

[0025] Preferably, after the film material passes through the film combining and adjusting roller group (36), it sequentially passes through the film combining roller (42) and the film combining servo traction roller (43), and then is connected to the bottom edge ironing of the film combining (3) in step 3). An upper film color mark block sensor (61) that is controlled in cooperation with the film combining servo traction roller (43) is provided in front of the film combining servo traction roller (43), and an upper film color mark block (16) that is detected in cooperation with the upper film color mark block sensor (61) is provided on the upper film (1); a lower film color mark block sensor (60) that is controlled in cooperation with the lower film servo traction roller group (31) is provided in front of the lower film servo traction roller group (31), and a lower film color mark block (35) that is detected in cooperation with the lower film color mark block sensor (60) is provided on the lower film (2).

[0026] Through such a design, the upper film and the lower film can be combined and transported along the production line.

[0027] Preferably, in step 3), a longitudinal sealing heat ironing component and a longitudinal sealing cooling component are sequentially included along the film combining transmission direction; in step 4), a transverse sealing heat ironing component and a transverse sealing cooling component are sequentially included along the film combining transmission direction.

[0028] Through such a design, the bottom edge and the side edges of the bag body can be heat ironed and bonded.

[0029] Preferably, the transverse sealing heat ironing component includes multiple groups of heat ironing assemblies. Each group of heat ironing assemblies includes a hot knife and a backing plate. The positional relationship between the hot knife and the backing plate is that the hot knife is above and the backing plate is below, or the hot knife is below and the backing plate is above. The above two positional relationships are alternately arranged along the film combining transmission direction.

[0030] Through such a design, the side surfaces can be heat ironed and bonded, and by interchanging the upper and lower positions of the hot knife and the backing plate, the side edge heat ironing bonding can be made more stable.

[0031] The advantages and beneficial effects of the present invention are as follows: Through such a bag-making process, the patterns on the upper film and the lower film can be overlapped and aligned, ensuring the bag-making accuracy of the bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of a double-layer bag body with patterns;

[0033] Figure 2Schematic diagram of the bag-making process for a double-layer bag with patterns (side view perspective);

[0034] Figure 3 It is Figure 2 An enlarged schematic diagram of area A in ;

[0035] Figure 4 It is Figure 2 An enlarged schematic diagram of area B in ;

[0036] Figure 5 It is Figure 2 An enlarged schematic diagram of area C in ;

[0037] Figure 6 It is Figure 2 An enlarged schematic diagram of area D in ;

[0038] Figure 7 It is a schematic diagram of the bag-making process for a double-layer bag with patterns (three-dimensional perspective);

[0039] Figure 8 It is Figure 7 An enlarged partial schematic diagram (front part of the production line);

[0040] Figure 9 It is Figure 7 An enlarged partial schematic diagram (middle part of the production line);

[0041] Figure 10 Figure 7 An enlarged partial schematic diagram (rear part of the production line);

[0042] Figure 11 It is an enlarged schematic diagram of area E in 10.

[0043] In the figure: 1. Upper film; 2. Lower film; 3. Combined film; 4. Upper film pattern; 5. Lower film pattern; 6. Upper film material roll; 7. Upper film guiding roller group; 8. Upper film constant tension swing arm roller group; 9. Upper film constant tension swing arm; 10. Upper film transition roller; 11. Upper film unwinding roller group; 12. Upper film stock storage swing arm roller; 13. Upper film stock storage swing arm; 14. Upper film combined film guiding roller; 15. Upper film lateral edge adjustment sensor; 16. Upper film color mark block; 17. Lower film material roll; 18. Lower film guiding roller group; 19. Lower film constant tension swing arm roller group; 20. Lower film constant tension swing arm roller; 21. Lower film transition roller; 22. Lower film turning first diagonal bar; 23. Lower film first vertical roller; 24. Lower film unwinding vertical roller; 25. Lower film second vertical roller; 26. Lower film turning second diagonal bar; 28. Lower film stock storage swing arm roller; 29. Lower film stock storage swing arm; 31. Lower film servo traction roller group; 33. Lower film combined film guiding roller; 34. Vertical deviation detection sensor; 35. Lower film color mark block; 36. Combined film adjustment roller group; 37. Upper combined film adjustment roller; 38. Lower combined film adjustment roller; 39. Adjustment gap; 40. Lateral adjustment reference end; 41. Lateral adjustment movable end; 42. Combined film roller; 43. Combined film servo traction roller; 44. Longitudinal seal heat ironing component; 45. Longitudinal seal cooling component; 46. Transverse seal heat ironing component; 47. Transverse seal cooling component; 48. Ironing knife; 49. Backing plate; 50. Cutting blade; 51. Rounding cutting punch; 52. Triangular notch; 53. Arc edge; 54. Driving roller assembly; 55. Color mark sensor; 56. Floating roller group; 57. Bag body; 58. Bottom edge; 59. Side edge; 61. Upper film color mark block sensor; 60. Lower film color mark block sensor. Detailed implementation mode

[0044] The following combines the drawings and embodiments to further describe the detailed implementation mode of the present invention. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0045] As Figures 1 - 11 shown, a double-layer bag making process with patterns is characterized by including the following steps:

[0046] 1). Input the upper film 1 and the lower film 2;

[0047] 2). Combine the upper film 1 and the lower film 2. During the combination process, correct the positions of the upper film 1 and the lower film 2. Patterns are printed on both the upper film 1 and the lower film 2. Through position correction, the upper film pattern 4 and the lower film pattern 5 overlap;

[0048] 3). Iron the bottom edge 58 of the combined film 3;

[0049] 4). Iron the side edge 59 of the combined film 3;

[0050] 5). Cut the waste edge of the combined film 3;

[0051] 6), Round the corners of the mating film 3;

[0052] 7), Cut the mating film 3 into bags.

[0053] The input upper film 1 in step 1) is completed by the upper film 1 input component. The upper film 1 input component includes an upper film material roll 6 around which the upper film 1 is sequentially wound, an upper film guide roller group 7, an upper film constant tension swing arm roller group 8 cooperating with the upper film guide roller group 7, an upper film transition roller 10, an upper film unwinding roller group 11, an upper film storage swing arm roller 12, and an upper film mating film guide roller 14.

[0054] The upper film 1 input component includes an upper film lateral edge adjustment sensor 15. The upper film lateral edge adjustment sensor 15 cooperates with the outer edge of the upper film 1 for detection. At least one laterally movable upper film lateral edge adjustment roller is included in the upper film guide roller group 7, or the upper film material roll 6, the upper film guide roller group 7, and the upper film constant tension swing arm roller group 8 move laterally as a whole.

[0055] The input lower film 2 in step 1) is completed by the lower film 2 input component. The lower film 2 input component includes a lower film material roll 17 around which the lower film 2 is sequentially wound, a lower film guide roller group 18, a lower film constant tension swing arm roller group 19 cooperating with the lower film guide roller group 18, a lower film transition roller 21, a lower film turning first diagonal rod 22, a lower film first vertical roller 23, a lower film unwinding vertical roller 24, a lower film second vertical roller 25, a lower film turning second diagonal rod 26, a lower film transition roller 21, a lower film storage swing arm roller 28, a lower film transition roller 21, a lower film servo traction roller group 31, a lower film transition roller 21, and a lower film mating film guide roller 33.

[0056] The lower film 2 input component includes a vertical deviation correction detection sensor 34. The vertical deviation correction detection sensor 34 cooperates with the outer edge of the lower film 2 for detection. The lower film first vertical roller 23 or the lower film second vertical roller 25 can move vertically to adjust the edge of the lower film 2.

[0057] The mating of the upper film 1 and the lower film 2 in step 2) is realized by a mating film adjusting roller group 36. The mating film adjusting roller group 36 includes a parallel mating film adjusting upper roller 37 and a mating film adjusting lower roller 38. There is an adjusting gap 39 between the mating film adjusting upper roller 37 and the mating film adjusting lower roller 38; the upper film 1 is input from the mating film adjusting upper roller 37, and the lower film 2 is input from the mating film adjusting lower roller 38 and then gradually approaches and contacts to form the mating film 3; the mating film adjusting roller group 36 can move up and down to adjust the front-back relative positions of the upper film 1 and the lower film 2.

[0058] One end of the mating film adjusting roller group 36 is a lateral adjustment reference end 40, and the other end is a lateral adjustment movable end 41. The lateral adjustment movable end 41 makes a small-angle rotation around the lateral adjustment reference end 40 to adjust the lateral relative positions of the upper film 1 and the lower film 2.

[0059] After the film material passes through the film combining adjusting roller group 36, it successively passes through the film combining roller 42 and the film combining servo traction roller 43 and then connects with the bottom edge ironing of the film combining 3 in step 3). A film color mark block sensor 61 which is in control cooperation with the film combining servo traction roller 43 is arranged in front of the film combining servo traction roller 43, and a film color mark block 16 which is in cooperation with the film color mark block sensor 61 for detection is arranged on the upper film 1. A lower film color mark block sensor 60 which is in control cooperation with the lower film servo traction roller group 31 is arranged in front of the lower film servo traction roller group 31, and a lower film color mark block 35 which is in cooperation with the lower film color mark block sensor 60 for detection is arranged on the lower film 2.

[0060] In step 3), it successively includes a longitudinal sealing and heat ironing component 44 and a longitudinal sealing and cooling component 45 along the transmission direction of the film combining 3; in step 4), it successively includes a transverse sealing and heat ironing component 46 and a transverse sealing and cooling component 47 along the transmission direction of the film combining 3.

[0061] The transverse sealing and heat ironing component 46 includes multiple groups of heat ironing assemblies. Each group of heat ironing assemblies includes an ironing knife 48 and a backing plate 49. The positional relationship between the ironing knife 48 and the backing plate 49 is that the ironing knife 48 is above and the backing plate 49 is below, or the ironing knife 48 is below and the backing plate 49 is above. The above two positional relationships are alternately arranged along the transmission direction of the film combining 3.

[0062] 5), cut the waste edges of the film combining 3; cutting blades 50 are arranged on both sides of the film combining 3 to cut the waste edge materials on both sides of the film combining 3.

[0063] 6), cut the rounded corners of the film combining 3; a rounded corner punching knife 51 is arranged at the center line position of the side edge 59, and a triangular - like notch 52 is punched at the side edge 59 position. The edge of the triangular - like notch 52 is an arc edge 53.

[0064] 7), cut the film combining 3 into bags. During cutting, two cuts are respectively made on the front side and the rear side of the sharp corner position of the triangular - like notch 52 to ensure that there are no burrs on the edge of the finally cut bag body 57.

[0065] Embodiment 1

[0066] During use, the upper film 1 passes through the upper film material roll 6, the upper film guiding roller group 7, the upper film constant - tension swing arm roller group 8 which is in cooperation with the upper film guiding roller group 7, the upper film transition roller 10, the upper film feeding roller group 11, the upper film storage swing arm roller 12, and the upper film combining guiding roller 14 to the film combining adjusting roller group 36;

[0067] Among them, the upper film constant - tension swing arm roller group 8 adjusts the tension of the output of the upper film 1 through the swing of the upper film constant - tension swing arm 9; the upper film feeding roller group 11 provides driving force for the upper film 1 to be transmitted along the flowing water direction. Since the conveying of the film combining servo traction roller 43 is an intermittent driving operation and the upper film feeding roller group 11 is a continuous driving operation, the upper film storage swing arm roller 12 realizes the storage and release of the upper film 1 through the swing of the storage swing arm.

[0068] Among them, the upper film lateral edge adjustment sensor 15 (the sensor type is photoelectric eye or CCD vision sensor) is arranged above the upper film guiding roller group 7 and cooperates with the edge of the upper film 1 or the upper film color marking line (continuous color lines arranged on the edge of the upper film 1). When the position of the edge of the upper film 1 or the upper film color marking line deviates from the predetermined position, the upper film coil 6, the upper film guiding roller group 7, and the upper film constant tension swing arm roller group 8 move horizontally as a whole for deviation adjustment to ensure that the edge of the upper film 1 is at the predetermined position, that is, to ensure the accuracy of the horizontal position of the upper film 1.

[0069] The lower film 2 passes through the lower film coil 17, the lower film guiding roller group 18, the lower film constant tension swing arm roller group 19, the lower film transition roller 21, the lower film turning first inclined rod 22, the lower film first vertical roller 23, the lower film feeding vertical roller 24, the lower film second vertical roller 25, the lower film turning second inclined rod 26, the lower film transition roller 21, the lower film storage swing arm roller 28, the lower film transition roller 21, the lower film servo traction roller group 31, the lower film transition roller 21, the lower film film combining guiding roller 33 to the film combining adjustment roller group 36.

[0070] Among them, the lower film constant tension swing arm roller group 19 adjusts the tension output by the lower film 2 through the swing of the lower film constant tension swing arm; the horizontal-to-vertical-to-horizontal transmission of the lower film 2 is realized through the lower film turning first inclined rod 22, the lower film first vertical roller 23, the lower film feeding vertical roller 24, the lower film second vertical roller 25, and the lower film turning second inclined rod 26, and the lower film feeding vertical roller 24 provides driving force for the lower film 2 to be transmitted along the flowing water direction.

[0071] Since the conveying of both the film combining servo traction roller 43 and the lower film servo traction roller group 31 is intermittent driving operation (and they are synchronized), the lower film feeding vertical roller 24 is a continuous driving operation, and the lower film storage swing arm roller 28 realizes the storage and release of the lower film 2 through the swing of the storage swing arm.

[0072] Among them, the vertical deviation detection sensor 34 (the sensor type is photoelectric eye or CCD vision sensor) is arranged on one side of the lower film first vertical roller 23 or the lower film second vertical roller 25 and cooperates with the edge of the lower film 2 or the lower film color marking line (continuous color lines arranged on the edge of the lower film 2). When the position of the edge of the lower film 2 or the lower film color marking line deviates from the predetermined position, the lower film first vertical roller 23 or the lower film second vertical roller 25 moves vertically for deviation adjustment to ensure that the edge of the lower film 2 is at the predetermined position, that is, to ensure the accuracy of the horizontal position of the lower film 2.

[0073] Among them, the lower film servo traction roller group 31 and the film combining servo traction roller 43 operate intermittently, and their reference beats are the same. The upper film color mark block sensor 61 (the sensor type is an optoelectronic eye) is responsible for scanning the upper film color mark block 16 and transmitting it to the PLC processor. The PLC processor controls the film combining servo traction roller 43 to stop. The distance between two upper film color mark blocks 16 is one traction beat; the lower film color mark block sensor 60 (the sensor type is an optoelectronic eye) is responsible for scanning the lower film color mark block 35 and transmitting it to the PLC processor. The PLC processor controls the lower film servo traction roller group 31 to stop. The distance between two lower film color mark blocks 35 is one traction beat; since the distance between the upper film color mark blocks 16 is the same as the distance between the lower film color mark blocks 35, the upper and lower film patterns are ensured to overlap according to the distance between their respective color marks.

[0074] Embodiment 2

[0075] On the basis of further optimizing Embodiment 1, the upper film 1 cooperates with the film combining adjusting upper roller 37, and the lower film 2 cooperates with the film combining adjusting lower roller 38. The upper film 1 is input from the film combining adjusting upper roller 37, and the lower film 2 is input from the film combining adjusting lower roller 38 and then gradually approaches and contacts to form the combined film 3. During the process of forming this combined film 3, the positions of the upper film 1 and the lower film 2 can be adjusted.

[0076] The upper film pattern 4 is printed on the upper film 1, and the lower film pattern 5 is printed on the lower film 2. Two types of misalignments will occur during transmission. The first is the misalignment along the material conveying direction, which is simply called the front-back misalignment; the second is the misalignment perpendicular to the material conveying direction, which is simply called the lateral misalignment.

[0077] If there is a front-back misalignment between the upper film pattern 4 and the lower film pattern 5, it is necessary to change the vertical position of the film combining adjusting roller group 36 to achieve it. Since the upper film 1 and the lower film are adjusted simultaneously, the film combining adjusting upper roller 37 and the film combining adjusting lower roller 38 move up and down synchronously. Compared with the movement of a single roller, the adjustment efficiency is doubled.

[0078] For example, if the pattern on the upper film 1 is advanced, it is necessary to drive the film combining adjusting roller group 36 to move downward. While the upper film 1 is pressed, the lower film is relaxed. While the upper film pattern 4 moves backward, the lower film pattern moves forward. Such a design can accelerate the adjustment speed. On the contrary, if the pattern on the lower film 2 is advanced, it is necessary to drive the film combining adjusting roller group 36 to move upward.

[0079] If there is a horizontal misalignment in the patterns of the upper film 1 and the lower film 2 (here, the horizontal misalignment refers to the relative misalignment of the pattern 4 on the upper film and the pattern 5 on the lower film in the horizontal direction), it is achieved by adjusting the rotation of the film combining adjustment roller set 36. In this state, the horizontal adjustment movable end 41 rotates around the horizontal adjustment reference end 40 by a small angle, and the rotation angle is within ±10°. Due to the certain length of the deviation rectifying adjustment roller set, the displacement of the horizontal adjustment movable end 41 is amplified, which is sufficient to complete the horizontal deviation rectification. The tightness of the upper film 1 and the lower film 2 in the horizontal direction changes, thereby driving the upper film 1 and the lower film 2 to slide horizontally.

[0080] For example, if the pattern 4 on the upper film is biased towards the horizontal adjustment movable end 41 relative to the pattern 5 on the lower film, the horizontal adjustment movable end 41 is driven to be depressed (relative to the horizontal adjustment reference end 40). Then, the pressure between the position of the upper film 1 close to the horizontal adjustment movable end 41 and the upper roller 37 for film combining adjustment becomes larger, while the pressure between the position of the upper film 1 close to the horizontal adjustment reference end 40 and the upper roller 37 for film combining adjustment becomes smaller. The upper film 1 moves as a whole towards the horizontal adjustment reference end 40. At the same time, the pressure between the position of the lower film material 23 close to the horizontal adjustment movable end 41 and the lower roller 38 for film combining adjustment becomes smaller, while the pressure between the position of the lower film material 23 close to the horizontal adjustment reference end 40 and the lower roller 38 for film combining adjustment becomes larger. The lower film material 23 moves as a whole towards the horizontal adjustment movable end 41. Since the upper film 1 and the lower film are adjusted in the opposite direction horizontally at the same time, compared with the movement of a single roller, the adjustment efficiency is doubled. Such a design can accelerate the adjustment speed. Conversely, if the pattern 4 on the upper film is biased towards the horizontal adjustment reference end 40 relative to the pattern 5 on the lower film, the horizontal adjustment movable end 41 needs to be driven to be raised for adjustment.

[0081] Since the film combining 3 will be thermally bonded immediately after step 2), the patterns 4 on the upper film and 5 on the lower film must be aligned, as they cannot be corrected after thermal bonding.

[0082] Embodiment 3

[0083] For further optimization of Embodiment 2, in step 3), it successively includes a longitudinal sealing and thermal bonding component 44 and a longitudinal sealing and cooling component 45 along the transmission direction of the film combining 3; in step 4), it successively includes a transverse sealing and thermal bonding component 46 and a transverse sealing and cooling component 47 along the transmission direction of the film combining 3. Cooling after thermal bonding can reduce wrinkling at the thermal bonding position and improve the flatness of the product surface.

[0084] The transverse sealing and thermal bonding component 46 includes multiple groups of thermal bonding assemblies. Each group of thermal bonding assemblies includes a hot knife 48 and a backing plate 49. The positional relationship between the hot knife 48 and the backing plate 49 is that the hot knife 48 is above and the backing plate 49 is below, or the hot knife 48 is below and the backing plate 49 is above. The above two positional relationships are alternately arranged along the transmission direction of the film combining 3. Preferably, there are three groups of multiple thermal bonding assemblies.

[0085] 5), Cut the waste edges of the laminated film 3; cutting blades 50 are arranged on both sides of the laminated film 3 to cut the waste edge materials on both sides of the laminated film 3.

[0086] 6), Cut the rounded corners of the laminated film 3; a rounded-corner punching die 51 is arranged at the center line position of the side edge 59, and a triangular-like notch 52 is punched at the position of the side edge 59, and the edge of the triangular-like notch 52 is an arc edge 53.

[0087] 7), Cut the laminated film 3 into bags. During cutting, two cuts are made respectively in front of and behind the sharp corner position of the triangular-like notch 52 to ensure that there are no burrs on the edge of the finally cut bag body 57.

[0088] In steps 3), 4), 5), 6), and 7), the transmission of the laminated film 3 is realized by the cooperation of the driving roller assembly 54 and the color mark sensor 55. A floating roller group 56 is also arranged in each step. The floating roller group 56 is used to judge the speed difference between the front and rear channels of the transmission of the laminated film 3. If the front channel is too fast, the floating roller group 56 floats up; if the front channel is too slow, the floating roller group 56 sinks.

[0089] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the invention.

Claims

1. A bag-making process for a double-layer bag with patterns, characterized in that, It includes the following steps: 1). Input the upper film (1) and the lower film (2); 2). Combine the upper film (1) and the lower film (2) to form a combined film (3). During the process of forming the combined film (3), correct the deviation of the positions of the upper film (1) and the lower film (2). Patterns are printed on both the upper film (1) and the lower film (2). Through deviation correction, the upper film pattern (4) and the lower film pattern (5) overlap; 3). Iron the bottom edge of the combined film (3); 4). Iron the side edges of the combined film (3); 5). Cut off the waste edges of the combined film (3); 6). Cut the rounded corners of the combined film (3); 7). Cut the combined film (3) into bags; The input of the lower film (2) in step 1) is completed by the lower film (2) input component. The lower film (2) input component includes a lower film material roll (17) around which the lower film (2) is sequentially wound, a lower film guide roller group (18), a lower film constant tension swing arm roller group (19) cooperating with the lower film guide roller group (18), a lower film transition roller (21), a first lower film turning diagonal rod (22), a first lower film vertical roller (23), a lower film unwinding vertical roller (24), a second lower film vertical roller (25), a second lower film turning diagonal rod (26), a lower film transition roller (21), a lower film storage swing arm roller (28), a lower film transition roller (21), a lower film servo traction roller group (31), a lower film transition roller (21), and a lower film combined film guide roller (33); The lower film (2) input component includes a vertical deviation correction detection sensor (34). The vertical deviation correction detection sensor (34) cooperates with the outer edge of the lower film (2) for detection. The first lower film vertical roller (23) or the second lower film vertical roller (25) can move vertically to adjust the edge of the lower film (2); The combination of the upper film (1) and the lower film (2) to form the combined film (3) in step 2) is achieved by a combined film adjustment roller group (36). The combined film adjustment roller group (36) includes a parallel combined film adjustment upper roller (37) and a combined film adjustment lower roller (38). An adjustment gap (39) is left between the combined film adjustment upper roller (37) and the combined film adjustment lower roller (38). The upper film (1) is input from the combined film adjustment upper roller (37), and the lower film (2) is input from the combined film adjustment lower roller (38) and then gradually approaches and contacts to form the combined film (3). The combined film adjustment roller group (36) can move up and down to adjust the front-back relative positions of the upper film (1) and the lower film (2); One end of the combined film adjustment roller group (36) is a horizontal adjustment reference end (40), and the other end is a horizontal adjustment movable end (41). The horizontal adjustment movable end (41) makes a small-angle rotation around the horizontal adjustment reference end (40) to adjust the horizontal relative positions of the upper film (1) and the lower film (2); After the upper film and the lower film pass through the film combining adjusting roller group (36), they sequentially pass through the film combining roller (42) and the film combining servo traction roller (43), and then are connected to the bottom edge ironing of the film combining (3) in step 3); a upper film color mark block sensor (61) which is in control cooperation with the film combining servo traction roller (43) is arranged in front of the film combining servo traction roller (43), and a upper film color mark block (16) which is in cooperation with the upper film color mark block sensor (61) for detection is arranged on the upper film (1); a lower film color mark block sensor (60) which is in control cooperation with the lower film servo traction roller group (31) is arranged in front of the lower film servo traction roller group (31), and a lower film color mark block (35) which is in cooperation with the lower film color mark block sensor (60) for detection is arranged on the lower film (2).

2. The bag-making process for a double-layer bag with patterns according to claim 1, characterized in that: The input of the upper film (1) in step 1) is completed by the upper film (1) input assembly. The upper film (1) input assembly includes an upper film material roll (6), an upper film guiding roller group (7), an upper film constant tension swing arm roller group (8), an upper film transition roller (10), an upper film unwinding roller group (11), an upper film storage swing arm roller (12), and an upper film combining guiding roller (14) around which the upper film (1) is sequentially wound.

3. The bag-making process for a double-layer bag with patterns according to claim 2, characterized in that: The upper film (1) input assembly includes an upper film lateral edge adjustment sensor (15). The upper film lateral edge adjustment sensor (15) is in cooperation with the outer edge of the upper film (1) for detection. At least one upper film (1) lateral edge adjustment roller which can move horizontally is included in the upper film guiding roller group (7), or the upper film material roll (6), the upper film guiding roller group (7), and the upper film constant tension swing arm roller group (8) move horizontally as a whole.

4. The bag-making process for a double-layer bag with patterns according to claim 1, characterized in that: In step 3), a longitudinal seal heat ironing component (44) and a longitudinal seal cooling component (45) are sequentially included along the transmission direction of the film combining (3); in step 4), a transverse seal heat ironing component (46) and a transverse seal cooling component (47) are sequentially included along the transmission direction of the film combining (3).

5. The bag-making process for a double-layer bag with patterns according to claim 4, characterized in that: The transverse seal heat ironing component (46) includes multiple groups of heat ironing assemblies. Each group of heat ironing assemblies includes a hot knife (48) and a backing plate (49). The positional relationship between the hot knife (48) and the backing plate (49) is that the hot knife (48) is above and the backing plate (49) is below, or the hot knife (48) is below and the backing plate (49) is above. The above two positional relationships are alternately arranged along the transmission direction of the film combining (3).

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