Method and device for making curved structure in paper tube

Abstract

The present application provides a method and device for making a curved structure on a paper tube. The method provides a first pressing plate and a second pressing plate. The surfaces of the first pressing plate and the second pressing plate facing each other have specially designed rolling teeth. The paper tube passes through the rolling teeth between the first pressing plate and the second pressing plate in a rolling manner. The rolling teeth squeeze the paper tube and quickly form a bendable accordion tube structure at a predetermined position of the paper tube. The production capacity is high and the production speed is fast. On the other hand, the special configuration of the rolling teeth from wide to narrow can form an inward pushing effect at both ends of the paper tube in the axial direction, so that the two ends of the accordion tube structure are tightened against the ridge. As the adhesive gradually dries and hardens, the accordion tube structure can produce a stereotyped effect, and it will not break or crack even if it is bent 180 degrees.

Description

Technical Field

[0001] The present application relates to a method and a device for manufacturing a bendable paper tube, and in particular to a method and a device for manufacturing a bent structure on a paper tube. Background Art

[0002] Certain tubular parts or products require the ability to bend according to their uses and functions. For example, known bendable straws and hookah pipes both require the ability to bend. Conventional bendable straws and hookah pipes are both made of plastic materials. The key to the bendability of conventional bendable straws and hookah pipes is that they have an accordion tube structure (or a bellows structure).

[0003] The published Taiwan Patent Certificate No. M243349 proposes a straw rolling forming mechanism for processing and manufacturing straws with bellows. The forming mechanism uses a first forming wheel and a second forming wheel that are relatively arranged and pivotally fixed to roll the passing straw to obtain the bellows. At the same time, the rotating needle shaft is used to synchronously drive the straw to rotate, thereby increasing the number of rotations of the straw within a certain stroke to improve the forming efficiency. However, the above patent technology can only be applied to the manufacture of plastic straws, and is not suitable for manufacturing bendable straws and paper hookah pipes.

[0004] On the other hand, only a small section of the bendable straw needs to be a accordion tube structure, and the rest of the section can still be a straight tube to meet the bendability requirement; as for hookah pipes, a longer accordion tube structure is usually required. The first forming wheel and the second forming wheel of the above patented technology cannot manufacture hookah pipes with a longer accordion tube structure. If the straw rolling forming mechanism of the above patented technology is to be used to manufacture hookah pipes, the axial length of the first forming wheel and the second forming wheel must be increased, which has the problem of increasing the size and weight of the equipment, and increasing power consumption and cost.

[0005] Although plastic straws are good in plasticity, waterproof, have certain elasticity or resilience, and are easy to process and manufacture, bendable straws and hookah pipes made of plastic materials are prone to environmental problems. Therefore, how to make bendable paper tubes has become one of the goals of relevant industries. Summary of the invention

[0006] Based on solving the above-mentioned technical problems, the main purpose of this application is to provide a method and a device for making a bent structure in a paper tube, which has the advantages of fast production speed, being suitable for manufacturing paper straws and hookah pipes, and will not break or crack even if bent 180 degrees.

[0007] In order to solve the above technical problems, an embodiment of the method for making a curved structure from a paper tube in the present application includes the following steps:

[0008] A first pressing plate and a second pressing plate are provided, wherein a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and a gap is provided between the first surface and the second surface for the paper tube to roll through, and an end of the paper tube entering the gap is defined as an inlet end according to the direction in which the paper tube passes through the gap, and an end of the paper tube leaving the gap is defined as an outlet end;

[0009] A first rolling tooth surface is formed on the first surface, and a second rolling tooth surface is formed on the second surface, wherein the first rolling tooth surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, and the spacing between the head ends of the first rolling teeth is greater than the spacing between the tail ends, and the second rolling tooth surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, and the spacing between the head ends of the second rolling teeth is greater than the spacing between the tail ends, and the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other;

[0010] The paper tube is fed from the inlet end into between the first rolling tooth surface and the second rolling tooth surface, and the paper tube is moved toward the outlet end and then leaves the gap. During the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure; and

[0011] During the process of the paper tube moving from the inlet end toward the outlet end, a supporting rod is placed in the center of the paper tube.

[0012] One aspect of the present application includes a device for making a curved structure in a paper tube, comprising:

[0013] A first pressing plate and a second pressing plate, a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and there is a gap between the first surface and the second surface for the paper tube to roll through, according to the direction of the paper tube passing through the gap, the end of the paper tube entering the gap is defined as the entrance end, and the end of the paper tube leaving the gap is defined as the exit end, the first surface has a first rolling tooth surface, and the second surface has a second rolling tooth surface;

[0014] A moving mechanism, used to send the paper tube from the inlet end into the space between the first rolling tooth surface and the second rolling tooth surface, and move the paper tube toward the outlet end, and then leave the gap;

[0015] The first rolling surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, the spacing between the head ends of the first rolling teeth is greater than the spacing between the tail ends, the second rolling surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, the spacing between the head ends of the second rolling teeth is greater than the spacing between the tail ends, the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other, and during the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure; and

[0016] A support rod placed in the center of the paper tube.

[0017] The spacing between the head ends of the first rolling teeth and the head ends of the second rolling teeth is 2.3 mm, and the spacing between the tail ends of the first rolling teeth and the tail ends of the second rolling teeth is 1.5 mm.

[0018] Another embodiment of the method for making a curved structure in a paper tube of the present application includes the following steps:

[0019] A first pressing plate and a second pressing plate are provided, wherein a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and a gap is provided between the first surface and the second surface for the paper tube to roll through, and an end of the paper tube entering the gap is defined as an inlet end according to the direction in which the paper tube passes through the gap, and an end of the paper tube leaving the gap is defined as an outlet end;

[0020] A first rolling tooth surface is formed on the first surface, and a second rolling tooth surface is formed on the second surface, the first rolling tooth surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, the first rolling teeth extend from the inlet end toward the outlet end and are divided into a front section and a rear section, the front sections of the first rolling teeth have a first spacing between each other and are parallel to each other, the rear sections of the first rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until a second spacing, the second rolling tooth surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, the second rolling teeth extend from the inlet end toward the outlet end and are divided into a front section and a rear section, the front sections of the second rolling teeth maintain the first spacing between each other and are parallel to each other, the rear sections of the second rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until the second spacing, and the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other;

[0021] The paper tube is fed from the inlet end into between the first rolling tooth surface and the second rolling tooth surface, and the paper tube is moved toward the outlet end and then leaves the gap. During the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure;

[0022] At least during the process of the paper tube moving from the inlet end toward the outlet end, a support rod is placed in the center of the paper tube, and the surface of the support rod has a plurality of grooves corresponding to the first rolling teeth and the second rolling teeth respectively; and

[0023] Before the paper tube reaches the connection point between the front section and the rear section of the first rolling teeth and the second rolling teeth, the support rod is pulled away from the paper tube.

[0024] Another embodiment of the device for making a curved structure from a paper tube in the present application includes:

[0025] A first pressing plate and a second pressing plate, a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and a gap is provided between the first surface and the second surface for the paper tube to roll through, an end of the paper tube entering the gap is defined as an inlet end according to the direction of the paper tube passing through the gap, and an end of the paper tube leaving the gap is defined as an outlet end, a first rolling tooth surface is provided on the first surface, and a second rolling tooth surface is provided on the second surface;

[0026] A moving mechanism, used for sending the paper tube from the inlet end into between the first rolling tooth surface and the second rolling tooth surface, and moving the paper tube toward the outlet end, and then leaving the gap;

[0027] The first rolling surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, the first rolling teeth extending from the inlet end toward the outlet end and divided into a front section and a rear section, the front sections of the first rolling teeth have a first spacing between each other and are parallel to each other, the rear sections of the first rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until a second spacing, the second rolling surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, the second rolling teeth extending from the inlet end toward the outlet end and divided into a front section and a rear section, the front sections of the second rolling teeth maintain the first spacing between each other and are parallel to each other, the rear sections of the second rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until the second spacing, the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other, and during the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure; and

[0028] A support rod is inserted into the center of the paper tube, and the surface of the support rod has a plurality of grooves corresponding to the first rolling teeth and the second rolling teeth respectively. Before the paper tube reaches the connection between the front section and the rear section of the first rolling teeth and the second rolling teeth, the support rod will be pulled out of the paper tube.

[0029] The heights of the first rolling teeth and the second rolling teeth gradually increase from the inlet end toward the outlet end.

[0030] The first spacing is 2.3 mm, and the second spacing is 1.5 mm.

[0031] The cross-sectional shapes of the first rolling teeth and the second rolling teeth are continuous sawtooth shapes or triangle shapes.

[0032] The head ends of the first rolling teeth and the second rolling teeth have an inverted slope.

[0033] The head ends of the first rolling teeth and the second rolling teeth are not in flush positions but are arranged in an arrow-shaped position, wherein the tip of the arrow-shaped tip faces the inlet end and the tail of the arrow-shaped tip faces the outlet end.

[0034] The moving mechanism includes: a belt and a pulley driving mechanism for driving the belt to rotate. The belt is arranged on one side of the radial direction of the paper tube to drive the paper tube to move from the inlet end to the outlet end and then leave the gap.

[0035] The material of the surface where the belt and the paper tube contact is rubber or urethane foam.

[0036] The advantages and effects of the method and device for making a curved structure from a paper tube of the present application are that, by using a first pressing plate and a second pressing plate with specially designed rolling teeth on the surface, a bendable accordion tube structure can be quickly formed at a predetermined position of the paper tube, which increases the production speed and improves the production capacity; on the other hand, the special configuration of the rolling teeth changing from wide to narrow can form an inward pushing effect at both ends of the paper tube in the axial direction, causing the two ends of the accordion tube structure to be tightened against the ridge, and as the adhesive gradually dries and hardens, the accordion tube structure can produce a stereotyped effect, and will not break or crack even if bent 180 degrees.

[0037] The details of other effects and embodiments of the present application are described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of the device for making a curved structure on a paper tube of the present application;

[0040] Figure 2 yes Figure 1 Structural cross section at CC position;

[0041] Figure 3 is a schematic diagram of the structure of the first pressing plate, illustrating the shape of the first rolling tooth;

[0042] Figure 4 yes Figure 1 A partial structural diagram of an embodiment of the present invention, illustrating an embodiment of the cross-sectional shape of the first rolling thread and the second rolling thread;

[0043] Figure 5A , Figure 5B It is a schematic diagram of the method of making a curved structure in a paper tube according to the present application;

[0044] Fig. 6A yes Figure 5A The top view at position A is a schematic diagram showing the action of the first rolling teeth squeezing the paper tube to form a bellows tube structure;

[0045] Figure 6B yes Figure 5B The top view at position B is a schematic diagram showing the action of the first rolling teeth squeezing the paper tube to form a bellows tube structure;

[0046] Fig. 7A Another preferred embodiment structure of the first rolling thread is shown;

[0047] Figure 7B yes Fig. 7A A top view of

[0048] Fig. 8A It is a partial structural schematic diagram of another embodiment of the device for making a curved structure in a paper tube of the present application, illustrating the shapes of the first pressing plate and the first rolling teeth;

[0049] Figure 8B yes Fig. 8A A top view of

[0050] Fig. 9 It is an action schematic diagram of another embodiment of the method for making a curved structure from a paper tube of the present application;

[0051] Fig. 10A It's a paper tube. Fig. 9 A schematic diagram of the structure in the cross-sectional direction of the P1 position, showing the first rolling tooth and the front section of the second rolling tooth squeezing the paper tube;

[0052] Fig. 10B yes Fig. 10A A schematic cross-sectional structure diagram of the support rod, illustrating the shapes of multiple grooves on the outer surface of the support rod;

[0053] Fig.11 It's a paper tube. Fig. 9A schematic diagram of the structure in the cross-sectional direction of the P3 position, showing the situation of the rear section of the first rolling tooth and the second rolling tooth squeezing the paper tube;

[0054] Fig.12 It is a partial structural diagram of an embodiment of the device for making a curved structure in a paper tube of the present application, illustrating the structure of a first pressing plate and a first rolling tooth that can be used to make a bellows tube structure of a hookah pipe;

[0055] Figure 13-Figure 15 , is a schematic diagram of the structure of a bendable paper straw and a hookah pipe.

[0056] Explanation of symbols

[0057] 10 first pressing plate 11 first surface

[0058] 20 second pressing plate 21 second surface

[0059] 30 moving mechanism 31 belt

[0060] 32 Pulley drive mechanism 33 Platform

[0061] 40, 40A support rod 41 groove

[0062] 50 paper tube 51 corrugated tube structure

[0063] 60 first rolling surface 61, 61A first rolling surface

[0064] 70 second rolling surface 71, 71A second rolling

[0065] D Clearance D1, D2 Height

[0066] IN inlet OUT outlet

[0067] R inverted slope S fan-shaped distribution

[0068] W1, W2 spacing W3 first spacing

[0069] W4 second spacing W5 total width

[0070] FS front section RS back section DETAILED DESCRIPTION

[0071] The positional relationships described in the following embodiments include: up, down, left and right. Unless otherwise specified, they are all based on the directions in which the components are drawn in the drawings.

[0072] It should be understood that, although the terms "first" and "second" or "one", "another" and "another" etc. herein can be used to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish elements from each other. For example, a first element can be referred to as a second element, and, similarly, a second element can be referred to as a first element without departing from the scope of protection of the present application. For another example, an element can be referred to as another element, and, similarly, another element can be referred to as another element without departing from the scope of protection of the present application.

[0073] First see Figure 1 , is a schematic diagram of an embodiment of the device for making a curved structure on a paper tube of the present application, and its left side view. An embodiment of the device for making a curved structure on a paper tube of the present application basically comprises: a first pressing plate 10, a second pressing plate 20, a moving mechanism 30 and a supporting rod 40.

[0074] A first surface 11 of the first pressing plate 10 faces a second surface 21 of the second pressing plate 20, the first surface 11 and the second surface 21 are parallel to each other, and there is a gap D between the first surface 11 and the second surface 21 for the paper tube 50 to roll through. According to the direction in which the paper tube 50 passes through the gap D, we define the end of the paper tube 50 entering the gap D as the inlet end IN, and define the end of the paper tube 50 leaving the gap D as the outlet end OUT. The first surface 11 has a first rolling surface 60, and the second surface 21 has a second rolling surface 70.

[0075] The moving mechanism 30 is used to send the paper tube 50 from the inlet end IN to between the first rolling tooth surface 60 and the second rolling tooth surface 70, and move the paper tube 50 toward the outlet end OUT, and then leave the gap D. The first rolling tooth surface 60 includes a plurality of first rolling teeth 61 extending from the inlet end IN toward the outlet end OUT, and the spacing W1 between the head ends (the end close to the inlet end IN) of the first rolling teeth 61 is greater than the spacing W2 between the tail ends (the end close to the outlet end OUT) (see FIG. Figure 3 ), the second rolling surface 70 includes a plurality of second rolling teeth 71 extending from the inlet end IN toward the outlet end OUT, the head ends of the second rolling teeth 71 are spaced at a distance W1 from each other, the tail ends of the second rolling teeth 71 are spaced at a distance W2 from each other, the first rolling teeth 61 and the second rolling teeth 71 are of the same shape and correspond to each other, and during the movement of the paper tube 50, the first rolling teeth 61 and the second rolling teeth 71 can be squeezed on the tube wall of the paper tube 50 to form a bellows tube structure 51 (see Fig. 6A , Figure 6B ).

[0076] In a preferred embodiment, the spacing W1 between the head ends of the first rolling teeth 61 and the second rolling teeth 71 is 2.3 mm, and the spacing W2 between the tail ends of the first rolling teeth 61 and the second rolling teeth 71 is 1.5 mm. Preferably, the cross-sectional shape of the first rolling teeth 61 and the second rolling teeth 71 is a continuous sawtooth or triangle (see Figure 4 In one preferred embodiment, the head ends of the first rolling teeth 61 and the second rolling teeth 71 have an inverted slope R (see Figure 2 ), when the paper tube 50 enters from the inlet end IN, the inverted slope R has a guiding and buffering function to prevent the paper tube 50 from being damaged or scratched by the head ends of the first rolling teeth 61 and the second rolling teeth 71.

[0077] See also Fig. 7A and Figure 7B , another preferred embodiment of the first rolling teeth 61 and the second rolling teeth 71 is shown. The first rolling teeth 61 of the first pressing plate 10 are used as an example to illustrate, and Figure 3 The difference between the embodiments is that the head ends of the first rolling teeth 61 are not in a flush position but are arranged in an arrow-shaped position, wherein the tip of the arrow is toward the inlet end IN, and the tail of the arrow is toward the outlet end OUT; in other words, the head end of the first rolling teeth 61 located in the middle of the plurality of first rolling teeth 61 is closest to the inlet end, and the head ends of the other first rolling teeth 61 on both sides thereof are successively backward in the direction of the outlet end OUT. Preferably, the head ends of the first rolling teeth 61 are slightly arc-shaped and spread outward in the lateral directions of both sides of the first pressing plate 10, forming a fan-shaped distribution S; the second rolling teeth 71 of the second pressing plate 20 are consistent with the shapes of the first rolling teeth 61 and correspond to each other, and are not further described. When the paper tube 50 enters the gap D between the first rolling teeth 61 and the second rolling teeth 71 from the inlet end IN, it will first contact the head ends of the single first rolling tooth 61 and the single second rolling tooth 71 located in the middle, forming a progressive squeezing effect to prevent the paper tube 50 from deflecting or violently deforming.

[0078] An embodiment of the moving mechanism 30 includes: a belt 31, and a pulley driving mechanism 32 for driving the belt 31 to rotate. The belt 31 is arranged on one side of the radial direction of the paper tube 50 (according to the direction shown in the figure, it is above the paper tube 50). A platform 33 is provided below both ends of the paper tube 50 to support the paper tube 50. The rotating belt 31 drives the paper tube 50 to move from the inlet end IN toward the outlet end OUT, and then leaves the gap D. The material of the surface where the belt 31 and the paper tube 50 contact is rubber or urethane foam, which can provide better friction.

[0079] The support rod 40 is used to be placed in the center of the paper tube 50 during the process of squeezing the paper tube 50 to prevent the paper tube 50 from being flattened; preferably, the outer diameter of the support rod 40 is slightly smaller than the inner diameter of the paper tube 50 so that there is enough space or gap to squeeze the tube wall of the paper tube 50 to form an accordion tube structure 51.

[0080] See also FIG. 5A to FIG. 5B , is a schematic diagram of the method of making a curved structure on a paper tube in the present application. When the paper tube 50 makes a curved structure, the paper tube 50 enters the gap D (see FIG. 1 ) between the first rolling surface 60 and the second rolling surface 70 from the inlet end IN through the moving mechanism 30. Figure 5A and Fig. 6A ). Since the spacing W1 between the head ends of the first rolling teeth 61 is greater than the spacing W2 between the tail ends, a first rolling tooth surface 60 and a second rolling tooth surface 70 that are wider near the inlet end IN and narrower near the outlet end OUT will be formed. Therefore, when the paper tube 50 passes through the gap D between the first rolling tooth surface 60 and the second rolling tooth surface 70 that becomes narrower from wide, in addition to forming a bellows tube structure 51 on the tube wall of the paper tube 50 by squeezing the first rolling teeth 61 and the second rolling teeth 71, an inward pushing effect will also be formed at both ends of the axial direction of the paper tube 50 (see Figure 6B ).

[0081] As a preferred embodiment of the present application, the paper tube 50 is basically formed by spirally winding at least two layers of paper sheets and bonding them to each other with adhesive to form a paper tube 50 having a spiral tube structure and at least two layers of tube wall. Before the adhesive is completely dried and hardened, the paper tube 50 still has good plasticity, which is conducive to forming the bellows tube structure 51 by the method of the present application; then, in the process of the paper tube 50 gradually moving toward the outlet end OUT, the first rolling teeth 61 and the second rolling teeth 71 are used to form an inward pushing effect at both ends of the axial direction of the paper tube 50, so that the two ends of the bellows tube structure 51 are tightened against the ridge, and as the adhesive gradually dries and hardens, the bellows tube structure 51 can produce a shaping effect; if necessary, the curing and hardening of the adhesive can also be accelerated by baking or heating.

[0082] Another effect of pushing the accordion tube structure 51 before the glue is completely dried and hardened is that it can appropriately destroy part of the glue of the accordion tube structure 51, which helps the paper tube 50 to easily bend 180 degrees at the position of the accordion tube structure 51. Even if it is bent 180 degrees, it will not break or crack. In the subsequent process, the drying and hardening of the glue can be accelerated by baking or heating. The dried and hardened glue has the effect of stabilizing the shape and structure of the accordion tube structure 51, preventing the accordion tube structure 51 from automatically returning to a straight tube.

[0083] See also Fig. 8A and Figure 8B , is another embodiment of the method and device for making a curved structure in a paper tube of the present application, and the aforementioned method and Figure 3 and Figure 7B The main difference of the embodiments is that Fig. 8A and Figure 8B The structures of the first rolling teeth 61A and the support rod 40A shown therein are different from those of Figure 3 and Figure 7B Embodiment (due to Fig. 8A and Figure 8B The shapes of the first rolling teeth 61A and the second rolling teeth 71A are consistent and correspond to each other. Fig. 8A and Figure 8B Only the shape of the first rolling tooth 61A is shown and its configuration is described as follows).

[0084] The first rolling teeth 61A extend from the inlet end IN toward the outlet end OUT and are divided into a front section FS and a rear section RS. The front sections FS of the first rolling teeth 61A have a first spacing W3 between them and are parallel to each other (see FIG. Fig. 10A ), the rear sections of the first rolling teeth 61A extend toward the outlet end OUT and gradually reduce the spacing between each other until a second spacing W4 (see Fig.11 ); the second rolling teeth 71A extend from the inlet end IN toward the outlet end OUT and are divided into a front section and a rear section. The front sections of the second rolling teeth 71A maintain the first spacing W3 and are parallel to each other. The rear sections of the second rolling teeth 71A extend toward the outlet end OUT and gradually reduce the spacing between each other until the second spacing W4. The shapes of the first rolling teeth 61A and the second rolling teeth 71A are consistent and correspond to each other. The outer surface of the support rod 40A has a plurality of grooves 41 (see Fig. 9 ) respectively correspond to and match the front sections FS of the first rolling teeth 61A and the front sections FS of the second rolling teeth 71B (see Fig. 10B As a preferred embodiment, the heights of the first rolling teeth 61A and the second rolling teeth 71A gradually increase from the inlet end IN toward the outlet end OUT. In other words, the height D1 of the first rolling teeth 61A and the second rolling teeth 71A at the inlet end IN (see Fig. 8A ), which is relatively smaller than the height D2 of the first rolling teeth 61A and the second rolling teeth 71A at the outlet end OUT. As a preferred embodiment, the first spacing W3 is 2.3 mm, and the second spacing W4 is 1.5 mm.

[0085] See also Fig. 9In the process of the paper tube 50 moving from the inlet end IN toward the outlet end OUT, the paper tube 50 first passes through the front section FS of the first rolling teeth 61A and the front section FS of the second rolling teeth 71B, and is slightly squeezed out to form a bellows tube structure 51 with a shallow indentation (for example, Fig. 9 Then, when the paper tube 50 reaches the connection point between the front section FS and the rear section RS of the first rolling teeth 61A and the second rolling teeth 71A ( Fig. 9 Before the P2 position is reached, the support rod 40A is pulled out of the paper tube 50, and then the paper tube 50 continues to pass through the rear section RS of the first rolling teeth 61A and the rear section RS of the second rolling teeth 71B. The first rolling teeth 61A and the second rolling teeth 71A will form an inward pushing effect at both ends of the axial direction of the paper tube 50 (for example, at Fig. 9 The two ends of the bellows tube structure 51 are pressed against each other (see Fig.11 ), since the heights of the first rolling teeth 61A and the second rolling teeth 71A gradually increase from the inlet end IN toward the outlet end OUT, a bellows structure 51 with deeper indentations can be formed after the paper tube 50 leaves the outlet end OUT.

[0086] See also Figure 12-Figure 15 The above-mentioned method and device of the present application only need to adjust the number of the first rolling teeth 61, 61A and the second rolling teeth 71, 71A, or the total width W5 occupied by the first rolling teeth 61, 61A and the second rolling teeth 71, 71A in the transverse direction of the first pressing plate 10 and the second pressing plate 20 respectively according to the size requirements of the bendable paper straws 80 and the hookah pipe 81. For example, the total width W5 is set to the length of the accordion tube structure of the hookah pipe. The bendable paper straws 80 and the hookah pipe 81 can be manufactured quickly and easily. Even by connecting multiple paper tubes 50 with the accordion tube structure 51, it can also be used to manufacture the required bendable paper straws 80 and hookah pipes 81.

[0087] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present application, and are not intended to limit the implementation methods of the technology of the present application in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present application, but they should still be regarded as technologies or embodiments that are essentially the same as the present application.

Claims

1. A method for making a curved structure in a paper tube, characterized in that: include: A first pressing plate and a second pressing plate are provided, wherein a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and a gap is provided between the first surface and the second surface for the paper tube to roll through, and an end of the paper tube entering the gap is defined as an inlet end according to the direction in which the paper tube passes through the gap, and an end of the paper tube leaving the gap is defined as an outlet end; A first rolling tooth surface is formed on the first surface, and a second rolling tooth surface is formed on the second surface, the first rolling tooth surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, the first rolling teeth extend from the inlet end toward the outlet end and are divided into a front section and a rear section, the front sections of the first rolling teeth have a first spacing between each other and are parallel to each other, the rear sections of the first rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until a second spacing, the second rolling tooth surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, the second rolling teeth extend from the inlet end toward the outlet end and are divided into a front section and a rear section, the front sections of the second rolling teeth maintain the first spacing between each other and are parallel to each other, the rear sections of the second rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until the second spacing, and the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other; The paper tube is fed from the inlet end into between the first rolling tooth surface and the second rolling tooth surface, and the paper tube is moved toward the outlet end and then leaves the gap. During the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure; At least during the process of the paper tube moving from the inlet end toward the outlet end, a support rod is placed in the center of the paper tube, and the surface of the support rod has a plurality of grooves corresponding to the first rolling teeth and the second rolling teeth respectively; and Before the paper tube reaches the connection point between the front section and the rear section of the first rolling teeth and the second rolling teeth, the support rod is pulled away from the paper tube.

2. The method for making a curved structure in a paper tube according to claim 1, characterized in that: The heights of the first rolling teeth and the second rolling teeth gradually increase from the inlet end toward the outlet end.

3. The method for making a curved structure on a paper tube according to claim 1, characterized in that: The first spacing is 2.3 mm, and the second spacing is 1.5 mm.

4. The method for making a curved structure in a paper tube according to claim 1, characterized in that: The cross-sectional shapes of the first rolling teeth and the second rolling teeth are continuous sawtooth shapes or triangle shapes.

5. The method for making a curved structure on a paper tube according to claim 1, characterized in that: The head ends of the first rolling teeth and the second rolling teeth have an inverted slope.

6. A device for making a curved structure on a paper tube, characterized in that: include: A first pressing plate and a second pressing plate, a first surface of the first pressing plate faces a second surface of the second pressing plate, the first surface and the second surface are parallel to each other, and a gap is provided between the first surface and the second surface for the paper tube to roll through, an end of the paper tube entering the gap is defined as an inlet end according to the direction of the paper tube passing through the gap, and an end of the paper tube leaving the gap is defined as an outlet end, a first rolling tooth surface is provided on the first surface, and a second rolling tooth surface is provided on the second surface; A moving mechanism, used for sending the paper tube from the inlet end into between the first rolling tooth surface and the second rolling tooth surface, and moving the paper tube toward the outlet end, and then leaving the gap; The first rolling surface includes a plurality of first rolling teeth extending from the inlet end toward the outlet end, the first rolling teeth extending from the inlet end toward the outlet end and divided into a front section and a rear section, the front sections of the first rolling teeth have a first spacing between each other and are parallel to each other, the rear sections of the first rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until a second spacing, the second rolling surface includes a plurality of second rolling teeth extending from the inlet end toward the outlet end, the second rolling teeth extending from the inlet end toward the outlet end and divided into a front section and a rear section, the front sections of the second rolling teeth maintain the first spacing between each other and are parallel to each other, the rear sections of the second rolling teeth extend toward the outlet end and gradually reduce the spacing between each other until the second spacing, the shapes of the first rolling teeth and the second rolling teeth are consistent and correspond to each other, and during the movement of the paper tube, the first rolling teeth and the second rolling teeth can be squeezed on the tube wall of the paper tube to form a bellows tube structure; and A support rod is inserted into the center of the paper tube, and the surface of the support rod has a plurality of grooves corresponding to the first rolling teeth and the second rolling teeth respectively. Before the paper tube reaches the connection between the front section and the rear section of the first rolling teeth and the second rolling teeth, the support rod will be pulled out of the paper tube.

7. The device for making a curved structure on a paper tube according to claim 6, characterized in that: The heights of the first rolling teeth and the second rolling teeth gradually increase from the inlet end toward the outlet end.

8. The device for making a curved structure on a paper tube according to claim 6, characterized in that: The first spacing is 2.3 mm, and the second spacing is 1.5 mm.

9. The device for making a curved structure on a paper tube according to claim 6, characterized in that: The cross-sectional shapes of the first rolling teeth and the second rolling teeth are continuous sawtooth shapes or triangle shapes.

10. The device for making a curved structure on a paper tube according to claim 6, characterized in that: The head ends of the first rolling teeth and the second rolling teeth have an inverted slope.

11. The device for making a curved structure on a paper tube according to claim 6, characterized in that: The moving mechanism includes: a belt and a pulley driving mechanism for driving the belt to rotate. The belt is arranged on one side of the radial direction of the paper tube to drive the paper tube to move from the inlet end toward the outlet end and then leave the gap.

12. The device for making a curved structure on a paper tube according to claim 11, characterized in that: The material of the surface where the belt contacts the paper tube is rubber or elastomeric.

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