Feeding preshrinking structure and bubble pressing machine comprising feeding preshrinking structure

Abstract

The utility model discloses a feeding preshrinking structure and a bubble pressing machine comprising the same, the feeding preshrinking structure comprises an upper clamping roller and a lower clamping roller, a plurality of upper pressing wheels are fixedly arranged on the upper clamping roller, a plurality of lower pressing wheels are fixedly arranged on the lower clamping roller, and the upper pressing wheels and the lower pressing wheels are arranged on the upper clamping roller. The ratio of the distance between the upper pressing wheel and the nearest lower pressing wheel to the longitudinal size of the overlapped part of the projection of the upper pressing wheel and the projection of the nearest lower pressing wheel in the length direction of the upper clamping roller is 0.3-0.9, or the ratio of the distance between the upper pressing wheel and the nearest lower pressing wheel to the longitudinal size of the overlapped part is 0.3-0.9; the included angle between the end face of the upper pressing wheel and the connecting line between the end point, close to the nearest lower pressing wheel, of the bottommost portion of the upper pressing wheel and the end point, close to the upper pressing wheel, of the topmost portion of the lower pressing wheel is 10-45 degrees. When the paper material passes through the space between the upper clamping roller and the lower clamping roller, the paper material can be folded and compressed in the width direction, preshrinking of the paper material in the width direction is achieved, in addition, the preshrinking effect of the paper material in the width direction can be guaranteed, and the probability that the paper material is torn in the subsequent bubble pressing forming process is reduced.

Description

Technical Field

[0001] The utility model relates to a feed pre-shrinkage structure and a bubble pressing machine comprising the same. Background Art

[0002] In the existing express logistics transportation, in order to protect the transported items, the items will be well protected, such as earthquake and collision protection, and the items in the packaging box will also be protected. At present, the items are generally supported by stuffing air cushions, bubble bags or paper pads in the packaging box to achieve the purpose of protection.

[0003] Take paper pads as an example. Generally, they can be produced by equipment. Bubble paper is one of the protective paper pads. Bubble paper is produced by a bubble press. The working principle of the bubble press is to use a pair of concave and convex rollers to stamp the paper material into shape, so that the surface of the formed paper material presents uneven ridges and pits. When the bubble paper is wrapped around the object, the three-dimensional shape formed by the ridges and pits can play a protective, shock-resistant and cushioning role for the object.

[0004] Since the paper material surface will be punched to form protrusions and pits when processing, the paper material is easy to break when being processed, resulting in reduced stability of the protrusions and pits, thereby reducing the protection, shock resistance, and buffering effects. For this reason, a structure that reduces the width of the paper entering the equipment is currently designed at the inlet of the bubble press, so that the width of the paper is reduced, and the width direction of the paper presents a zigzag wave shape, providing a deformation margin for the subsequent punching deformation of the paper material to reduce the probability of the protrusion or pit breaking. At present, the structure is generally: two parallel rods, rotating rollers or rollers are set on the rods, and the rollers or rollers on one rod are inserted between the rollers or rollers on the other rod, so that when the paper passes, the width direction presents a zigzag wave shape, which meets the purpose of shortening the width of the paper. However, in actual use, the paper often has creases and tears at the rollers or has a small deformation, and when the width of the paper changes, the reduction effect of the rollers on the paper is also unstable, making the overall yield rate not high. Utility Model Content

[0005] The purpose of the utility model is to provide a feed pre-shrinkage structure and a bubble pressing machine comprising the same, so as to solve at least one of the above technical problems.

[0006] According to one aspect of the utility model, a feed pre-shrinking structure is provided, comprising an upper clamping roller and a lower clamping roller with opposite rotation directions.

[0007] A plurality of upper pressing wheels are fixedly arranged on the upper clamping roller, and a plurality of lower pressing wheels are fixedly arranged on the lower clamping roller. At least some of the upper pressing wheels and at least some of the lower pressing wheels are staggeredly distributed in the length direction of the gap between the upper clamping roller and the lower clamping roller, and the projections of the upper pressing wheels and the lower pressing wheels in the length direction of the gap between the upper clamping roller and the lower clamping roller overlap.

[0008] The ratio of the spacing dimension between the upper pressing wheel and the nearest lower pressing wheel in the length direction of the upper clamping roller to the longitudinal dimension of the overlapping part of the projection of the upper pressing wheel and the nearest lower pressing wheel in the length direction of the upper clamping roller is 0.3 to 0.9, or the angle between the connecting line between the end point of the bottom of the upper pressing wheel close to the nearest lower pressing wheel and the end point of the top of the lower pressing wheel close to the upper pressing wheel and the end face of the upper pressing wheel is 10 to 45°.

[0009] The feeding pre-shrinkage structure of the utility model, when the paper passes between the upper clamping roller and the lower clamping roller, since at least part of the upper pressing wheels and at least part of the lower pressing wheels are staggered and the projections of the upper pressing wheels and the lower pressing wheels in the length direction of the gap between the upper clamping roller and the lower clamping roller overlap, under the action of the upper pressing wheels and the lower pressing wheels, the width direction (the length direction of the upper clamping roller and the lower clamping roller) of the paper will be wrinkled and compressed to form a wave shape, shortening the size of the paper in the width direction, thereby achieving pre-shrinkage of the paper in the width direction, and since the ratio of the spacing between the upper pressing wheel and the lower pressing wheel and the depth of the upper pressing wheel extending into the lower pressing wheel is 0.3-0.9, or since the angle setting of the upper pressing wheel and the nearest lower pressing wheel is 10-45 degrees, the pre-shrinkage effect of the paper in the width direction can be guaranteed, thereby reducing the probability of the paper being torn when it is subsequently pressed and formed, and making full preparations for the subsequent pressing and forming of the paper.

[0010] In some embodiments, the spacing between the two outermost upper pressing wheels can be 290-310 mm. Thus, this spacing setting can be compatible with the pre-shrinkage treatment of paper materials with a width of 300 mm, 400 mm, and 500 mm, and has a good pre-shrinkage effect, which is basically compatible with paper materials of commonly used widths, and can ensure that the paper materials are not easily torn during stamping.

[0011] In some embodiments, the spacing between the two outermost lower pressing wheels can be 290-310 mm. Thus, this spacing setting can be compatible with the pre-shrinkage treatment of paper materials with a width of 300 mm, 400 mm, and 500 mm, and has a good pre-shrinkage effect, which is basically compatible with paper materials of commonly used widths, and can ensure that the paper materials are not easily torn during stamping.

[0012] In some embodiments, at least one upper pressing wheel between the two outermost upper pressing wheels in the length direction of the upper clamping roller may have a thickness greater than the thickness of the two outermost upper pressing wheels. Thus, at least one upper pressing wheel between the two outermost upper pressing wheels can be used as a key area for pre-shrinking the paper in the width direction, thereby ensuring the overall pre-shrinking effect of the paper in the width direction.

[0013] In some embodiments, the number of upper pressing wheels may be four, and the thickness of the two upper pressing wheels on the outermost sides in the length direction of the upper clamping roller is smaller than the thickness of the other two upper pressing wheels. Thus, the two upper pressing wheels between the two upper pressing wheels on the outermost sides can serve as the key area for pre-shrinking the paper in the width direction, further ensuring the overall effect of pre-shrinking the paper in the width direction.

[0014] In some embodiments, the number of lower pressing wheels may be six, and two lower pressing wheels are evenly spaced on both sides of the two middle upper pressing wheels. Thus, in this case, two upper pressing wheels between the two outermost upper pressing wheels and four lower pressing wheels between the two outermost lower pressing wheels can serve as the key area for pre-shrinking the paper in the width direction, thereby ensuring the pre-shrinking effect on the paper in the width direction.

[0015] In some embodiments, at least one of the two outermost lower pressing wheels in the length direction of the lower clamping roller may have a thickness greater than the thickness of the two outermost lower pressing wheels. Thus, at least one of the two outermost lower pressing wheels may serve as a key area for pre-shrinking in the width direction of the paper.

[0016] In some embodiments, an upper clamping wheel may be fixedly provided on the upper clamping roller, and a lower clamping wheel may be fixedly provided on the lower clamping roller. The upper clamping wheel and the lower clamping wheel can clamp the paper together and transport the paper to the downstream direction.

[0017] The outer diameter of the upper pressing wheel is larger than the outer diameter of the upper clamping wheel and / or the outer diameter of the lower pressing wheel is larger than the outer diameter of the lower clamping wheel.

[0018] Thus, the upper pressing wheel can be extended into between the lower pressing wheels and / or the lower pressing wheel can be extended into between the upper pressing wheels, ensuring that the upper pressing wheel can press the paper in the direction of the lower pressing wheel and / or the lower pressing wheel can press the paper in the direction of the upper pressing wheel, so that the paper is wrinkled, thereby achieving pre-shrinkage of the paper in the width direction. Moreover, the upper clamping wheel and the lower clamping wheel can clamp the paper and convey the paper in the downstream direction. The upper clamping roller and the lower clamping roller can both pre-shrink the paper and convey the paper in the downstream direction, thereby achieving the two-in-one function of pre-shrinking and conveying the paper.

[0019] In some embodiments, the upper clamping roller and the lower clamping roller can move closer to or farther from each other. Therefore, when loading is required, the upper clamping roller and the lower clamping roller are moved away from each other, and then the paper can be easily passed between the upper clamping roller and the lower clamping roller. After loading is completed, the upper clamping roller and the lower clamping roller are moved closer to each other to clamp the paper.

[0020] According to another aspect of the utility model, a bubble pressing machine is provided, comprising a driving mechanism and the aforementioned feed pre-shrinking structure, wherein the driving mechanism drives the upper clamping roller and the lower clamping roller to rotate in opposite directions.

[0021] The bubble pressing machine of the utility model can ensure the pre-shrinkage effect of paper in the width direction due to the setting of the distance between the upper pressing wheel and the lower pressing wheel and the depth of the upper pressing wheel extending into the lower pressing wheel or due to the angle setting of the upper pressing wheel and the nearest lower pressing wheel, thereby reducing the probability of paper being torn when being bubbled and formed by the bubble pressing mechanism of the bubble pressing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a feed pre-shrinkage structure according to an embodiment of the utility model;

[0023] Figure 2 for Figure 1 A side view of the upper clamping roller and the lower clamping roller in the feed pre-shrinking structure shown;

[0024] Figure 3 for Figure 2 An enlarged schematic diagram of point A among the upper and lower clamping rollers is shown. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0027] Figures 1 to 3 The structure of a feed pre-shrinkage structure according to an embodiment of the utility model is schematically shown.

[0028] refer to Figures 1 to 3 A feed pre-shrinkage structure comprises an upper clamping roller 1 and a lower clamping roller 2, wherein the upper clamping roller 1 and the lower clamping roller 2 rotate in opposite directions.

[0029] refer to Figure 2An upper clamping roller 1 is fixed to the upper clamping roller 1, and the upper clamping roller 12 rotates synchronously with the upper clamping roller 1. A lower clamping roller 22 is fixed to the lower clamping roller 2, and the lower clamping roller 2 rotates synchronously with the lower clamping roller 2. The upper clamping roller 12 and the lower clamping roller 22 can clamp the paper passing between the upper clamping roller 1 and the lower clamping roller 2 in the longitudinal direction. The upper clamping roller 12 and the lower clamping roller 22 can clamp the paper and transport the paper to the downstream direction.

[0030] refer to Figure 1 and Figure 2 , the number of the upper clamping wheels 12 and the number of the lower clamping wheels 22 are both three, and the three upper clamping wheels 12 respectively clamp the paper together with one lower clamping wheel 22 and convey the paper to the downstream direction. In other embodiments, the number of the clamping wheels 12 and the lower clamping wheels 22 can be adjusted according to the width of the paper and the pre-shrinkage requirements of the paper, ensuring that each upper clamping wheel 12 can clamp the paper together with one lower clamping wheel 22 and convey the paper to the downstream direction.

[0031] refer to Figure 2 , a plurality of upper pressing wheels 11 are fixed on the upper clamping roller 1, and a plurality of lower pressing wheels 21 are fixed on the lower clamping roller 2, and at least part of the upper pressing wheels 11 and at least part of the lower pressing wheels 21 are arranged in the length direction of the gap between the upper clamping roller 1 and the lower clamping roller 2 ( Figure 2In the present embodiment, the number of upper pressing wheels 11 is four, and the number of lower pressing wheels 21 is six. The four upper pressing wheels 11 and the three upper clamping wheels 12 are arranged at intervals on the upper clamping roller 1. The arrangement mode and spacing of the upper pressing wheels 11 and the upper clamping wheels 12 on the left side of the middle upper clamping wheel 12 are the same as the arrangement mode and spacing of the upper pressing wheels 11 and the upper clamping wheels 12 on the right side of the middle upper clamping wheel 12, that is, they are symmetrically distributed about the middle upper clamping wheel 12, and the arrangement mode and spacing of the lower pressing wheels 21 and the lower clamping wheels 22 on the left side of the middle lower clamping wheel 22 are the same as the arrangement mode and spacing of the lower pressing wheels 21 and the lower clamping wheels 22 on the right side of the middle lower clamping wheel 22, that is, they are symmetrically distributed about the middle lower clamping wheel 22, with the middle upper clamping wheel 12 and the lower clamping wheel 22 as the center line, and the left side The two upper pressing wheels 11 and the three lower pressing wheels 21 are staggered, and the two upper pressing wheels 11 and the three lower pressing wheels 21 on the right are staggered; the two lower pressing wheels 21 are evenly spaced on the left and right sides of the two upper pressing wheels 11 in the middle. In this embodiment, the thickness of the two outermost upper pressing wheels 11 in the length direction of the upper clamping roller 1 is less than the thickness of the two upper pressing wheels 11 in the middle, and the thickness of the lower pressing wheel 21 is the same as the thickness of the two outermost upper pressing wheels 11. In this way, the two upper pressing wheels 11 in the middle and the four lower pressing wheels 21 in the middle can be used together as the key area for pre-shrinking in the width direction of the paper, and are symmetrically distributed to ensure that the pre-shrinkage of the paper is balanced, thereby ensuring the overall effect of the pre-shrinkage of the paper in the width direction. In other embodiments, the number and distribution of the upper pressing wheels 11, the upper clamping wheel 12, the lower pressing wheel 21, and the lower clamping wheel 22 can be adjusted according to the width of the paper and the pre-shrinkage requirements of the paper. In other embodiments, the thickness of the two outermost lower pressing wheels 21 in the length direction of the lower clamping roller 2 may be smaller than the thickness of the other four lower pressing wheels 21 , and the thickness of the upper pressing wheel 11 may be the same as the thickness of the two outermost lower pressing wheels 21 .

[0032] The length direction of the gap between the upper clamping roller 1 and the lower clamping roller 2 is ( Figure 2 The projections on the left and right directions shown in the figure overlap. Figure 2 The outer diameter of the upper pressing wheel 11 is larger than the outer diameter of the upper clamping wheel 12, and the outer diameter of the lower pressing wheel 21 is larger than the outer diameter of the lower clamping wheel 22, that is, the upper pressing wheel 11 is Figure 2 The longitudinal direction shown can extend between the lower pressing wheels 21, and the lower pressing wheels 21 are Figure 2The longitudinal direction shown can extend between the upper pressing wheels 11, so that when the paper passes between the upper clamping roller 1 and the lower clamping roller 2, the upper pressing wheel 11 can press the paper in the direction of the lower pressing wheel 21, and the lower pressing wheel 21 can press the paper in the direction of the upper pressing wheel 11, so that the paper is wrinkled. Under the joint action of the upper pressing wheel 11 and the lower pressing wheel 21, the width direction of the paper (the length direction of the upper clamping roller 1 and the lower clamping roller 2) will be compressed by the wrinkles to form a wave shape, shortening the size of the paper in the width direction, realizing pre-shrinkage of the paper in the width direction, thereby reducing the probability of the paper being torn when it is subsequently fed into the pre-shrinkage structure for embossing.

[0033] refer to Figure 3 The ratio of the spacing dimension L1 between the upper pressing wheel 11 and the nearest lower pressing wheel 21 in the length direction of the upper clamping roller 1 and the longitudinal dimension L2 (compression depth of the paper) of the overlapping part of the projections of the upper pressing wheel 11 and the nearest lower pressing wheel 21 in the length direction of the upper clamping roller 1 is 0.3-0.9. This setting can ensure the pre-shrinkage effect of the paper in the width direction, reduce the probability of the paper being torn during subsequent bubble forming, and make full preparations for the subsequent bubble forming of the paper.

[0034] refer to Figure 3 The angle a between the connecting line 10 between the end point of the bottom of the upper pressing wheel 11 close to the nearest lower pressing wheel 21 and the end point of the top of the lower pressing wheel 21 close to the upper pressing wheel 11 and the end face of the upper pressing wheel 11 is 10-45°. This setting can ensure the pre-shrinkage effect of the paper in the width direction, reduce the probability of the paper being torn during subsequent bubble forming, and make full preparations for the subsequent bubble forming of the paper.

[0035] refer to Figure 2 In this embodiment, the spacing L3 between the two outermost lower pressing wheels 21 is 290-310 mm. This spacing setting can be compatible with the pre-shrinkage treatment of paper materials with a width of 300 mm, 400 mm, and 500 mm, and has a good pre-shrinkage effect. It can basically be compatible with paper materials of commonly used widths and can ensure that the paper materials are not easily torn during stamping. In other embodiments, it can also be: the spacing between the two outermost upper pressing wheels 11 is 290-310 mm.

[0036] In this embodiment, the upper clamping roller 1 and the lower clamping roller 2 can move closer to or farther away from each other. When the upper clamping roller 1 and the lower clamping roller 2 are installed on the frame of the bubble press, the ends of the upper clamping roller 1 or the lower clamping roller 2 can be installed on the longitudinal slide rail on the frame. The upper clamping roller 1 and the lower clamping roller 2 can be moved closer to or farther away from each other manually, or by a driving component, which is not limited here.

[0037] refer to Figure 2In the feed pre-shrinking structure of the utility model, when the paper passes between the upper clamping roller 1 and the lower clamping roller 2, the upper clamping wheel 12 and the lower clamping wheel 22 clamp the paper together and convey the paper to the downstream direction. At the same time, under the joint action of the upper pressing wheel 11 and the lower pressing wheel 21, the width direction of the paper (the length direction of the upper clamping roller 1 and the lower clamping roller 2) will be wrinkled and compressed to form a wave shape, shortening the size of the paper in the width direction, realizing the pre-shrinkage of the paper in the width direction, and because L1 ( Figure 3 The depth L2 between the upper pressing wheel 11 and the lower pressing wheel 12 (shown) Figure 3 The ratio of the upper pressing wheel 11 to the nearest lower pressing wheel 21 is 0.3 to 0.9, and the angle a between the upper pressing wheel 11 and the nearest lower pressing wheel 21 is set to 10 to 45 degrees, which can ensure the pre-shrinkage effect of the paper in the width direction, reduce the probability of the paper being torn during subsequent bubble forming, and make full preparations for the subsequent bubble forming of the paper. In addition, the upper clamping roller 1 and the lower clamping roller 2 can both pre-shrink the paper and transport the paper to the downstream direction, realizing the two-in-one function of pre-shrinking and transporting the paper.

[0038] The bubble pressing machine includes a driving mechanism and a feed pre-shrinking structure, wherein the driving mechanism can drive the upper clamping roller 1 and the lower clamping roller 2 to rotate in opposite directions; specifically, referring to Figure 1 An upper gear 13 is installed at one end of the upper clamping roller 1, and a lower gear 23 is installed at the end of the lower clamping roller 2. The upper clamping roller 1 and the lower clamping roller 2 can rotate in opposite directions through the meshing upper gear 13 and the lower gear 23. A synchronous wheel 14 is installed at the other end of the upper clamping roller 1. The driving mechanism can be a motor. The motor can drive the synchronous wheel 14 to rotate through a synchronous belt. The synchronous wheel 14 drives the upper clamping roller 1 to rotate. The upper clamping roller 1 drives the lower clamping roller 2 to rotate synchronously through the meshing upper gear 13 and the lower gear 23. The upper clamping roller 1 and the lower clamping roller 2 rotate in opposite directions to realize the transportation of paper.

[0039] The bubble pressing machine of the utility model, due to L1 ( Figure 3 The depth L2 between the upper pressing wheel 11 and the lower pressing wheel 12 (shown) Figure 3 The ratio of the upper pressing wheel 11 to the nearest lower pressing wheel 21 is 0.3 to 0.9, and the angle a between the upper pressing wheel 11 and the nearest lower pressing wheel 21 is 10 to 45 degrees, which can ensure the pre-shrinkage effect of the paper in the width direction, reduce the probability of the paper being torn when being pressed by the pressing mechanism of the bubble pressing machine, and is compatible with the pre-shrinkage treatment of paper with a width of 300 mm, 400 mm, and 500 mm, all of which have good pre-shrinkage effects, and are basically compatible with paper of commonly used widths.

[0040] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Feed pre-shrinkage structure, characterized in that: It includes an upper clamping roller and a lower clamping roller rotating in opposite directions. The upper clamping roller is fixedly provided with a plurality of upper pressing wheels, and the lower clamping roller is fixedly provided with a plurality of lower pressing wheels, at least some of the upper pressing wheels and at least some of the lower pressing wheels are staggeredly distributed in the length direction of the gap between the upper clamping roller and the lower clamping roller, and the projections of the upper pressing wheels and the lower pressing wheels in the length direction of the gap between the upper clamping roller and the lower clamping roller overlap. The ratio of the spacing dimension between the upper pressing wheel and the nearest lower pressing wheel in the length direction of the upper clamping roller to the longitudinal dimension of the overlapping part of the projection of the upper pressing wheel and the nearest lower pressing wheel in the length direction of the upper clamping roller is 0.3 to 0.9, or the angle between the connecting line between the end point of the bottom of the upper pressing wheel close to the nearest lower pressing wheel and the end point of the top of the lower pressing wheel close to the upper pressing wheel and the end face of the upper pressing wheel is 10 to 45°.

2. The feed pre-shrinkage structure according to claim 1, characterized in that: The distance between the two outermost upper pressing wheels is 290-310 mm.

3. The feed pre-shrinkage structure according to claim 1, characterized in that: The distance between the two outermost lower pressing wheels is 290 to 310 mm.

4. The feed pre-shrinkage structure according to claim 1, characterized in that: At least one upper pressing wheel between the two outermost upper pressing wheels in the length direction of the upper clamping roller has a thickness greater than that of the two outermost upper pressing wheels.

5. The feed pre-shrinkage structure according to claim 4, characterized in that: The number of the upper pressing wheels is four, and the thickness of the two outermost upper pressing wheels in the length direction of the upper clamping roller is smaller than the thickness of the other two upper pressing wheels.

6. The feed pre-shrinkage structure according to claim 5, characterized in that: The number of the lower pressing wheels is six, and two lower pressing wheels are evenly spaced on both sides of the two middle upper pressing wheels.

7. The feed pre-shrinkage structure according to claim 1, characterized in that: At least one lower pressing wheel between the two outermost lower pressing wheels in the length direction of the lower clamping roller has a thickness greater than that of the two outermost lower pressing wheels.

8. The feed pre-shrinkage structure according to any one of claims 1 to 7, characterized in that: The upper clamping roller is fixedly provided with an upper clamping wheel, and the lower clamping roller is fixedly provided with a lower clamping wheel. The upper clamping wheel and the lower clamping wheel can clamp the paper together and transport the paper to the downstream direction. The outer diameter of the upper pressing wheel is larger than the outer diameter of the upper clamping wheel and / or the outer diameter of the lower pressing wheel is larger than the outer diameter of the lower clamping wheel.

9. The feed pre-shrinkage structure according to claim 8, characterized in that: The upper clamping roller and the lower clamping roller can move closer to or farther away from each other.

10. A bubble pressing machine, characterized in that: The invention comprises a driving mechanism and the feed pre-shrinking structure according to any one of claims 1 to 9, wherein the driving mechanism drives the upper clamping roller and the lower clamping roller to rotate in opposite directions.

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