Method of making paper straws

Abstract

The embodiment of the present application provides a paper straw manufacturing method, comprising the following steps: S1: a first paper tape is rotationally wound on a first mandrel to form an inner tube, the inner tube slides along a first direction, a second paper tape is rotationally wound on a second mandrel to form an outer tube, the outer tube slides along the first direction, the second mandrel is arranged downstream of the first mandrel, and the inner tube passes through an outer mandrel hole and is arranged in a second tube hole; S2: an expanding device arranged in the first tube hole expands the inner tube at a first predetermined position to form an expansion part; S3: a roller pressing device arranged outside the outer tube rolls the outer tube at a second predetermined position to form a contraction part, and an inner diameter of the contraction part is less than or equal to an outer diameter of the expansion part; and S4: the inner tube and the outer tube are cut to form a paper straw, the inner tube and the outer tube are simultaneously formed by the above method, the inner tube is arranged in the outer tube, the inner tube is formed with the expansion part, the outer tube is formed with the contraction part, the contraction part can be clamped on the expansion part, and the inner tube is prevented from being easily pulled out of the outer tube.

Description

Technical Field

[0001] This invention relates to a method for manufacturing paper straws. Background Technology

[0002] With the development of the beverage industry, straws of different specifications and models are being used more and more widely. Traditional plastic straws have caused serious pollution to marine life and the environment, exacerbating the problem of plastic waste. Against this backdrop, environmentally friendly paper straw alternatives have attracted much attention due to their biodegradable characteristics. However, the short lifespan and easy breakage of traditional paper straws have limited their widespread application.

[0003] Based on this market demand and technological challenge, telescopic paper straws have emerged. Typically, telescopic paper straws consist of an inner tube and an outer tube, which are manufactured separately and then threaded together. Paper straws produced in this way have problems such as the inner tube and outer tube easily separating. At the same time, because secondary processing is required to thread the inner tube and outer tube together, the edges or ends of the tubes are easily damaged, which greatly reduces their service life when wetted by liquid.

[0004] Therefore, a solution needs to be developed and implemented to address the aforementioned technical problems. Summary of the Invention

[0005] Therefore, the present invention provides a method for manufacturing paper straws to solve the above-mentioned technical problems.

[0006] A method for manufacturing paper straws includes the following steps:

[0007] S1: A first paper tape is rotated and wound on a first mandrel including a first outer wall to form an inner tube with a first tube hole. The inner tube slides on the first outer wall along a first direction. A second paper tape is rotated and wound on a second mandrel including a second outer wall and an outer mandrel hole to form an outer tube with a second tube hole. The outer tube slides on the second outer wall along a first direction. The second mandrel is located downstream of the first mandrel, and the inner tube passes through the outer mandrel hole and is inserted into the second tube hole.

[0008] S2: An expansion device located inside the first tube hole expands the inner tube at a first predetermined position to form an expansion section;

[0009] S3: The roller pressing device located on the outside of the outer tube rolls the outer tube at a second predetermined position to form a shrinkage section, wherein the inner diameter of the shrinkage section is less than or equal to the outer diameter of the expansion section;

[0010] S4: Cut the inner tube and outer tube to form a paper straw.

[0011] The second mandrel includes a second axis, the first mandrel includes a first axis, and the outer mandrel hole includes a third axis. The third axis, the second axis, and the first axis are collinear.

[0012] In step S1, the inner tube slides at the same speed as the outer tube in the first direction.

[0013] The expansion device includes an expansion rod configured to move outward from the center and an actuating device for moving the expansion rod outward. The actuating device includes a deformation part connected to the expansion rod and an expansion extrusion end for moving the deformation part. The expansion extrusion end includes a pushing surface, which is inclined. The deformation part includes a contact surface corresponding to the pushing surface.

[0014] The expansion device further includes an inner sleeve, and the deformation part is disposed at the end of the inner sleeve to limit the position of the deformation part.

[0015] The inner sleeve includes a sleeve hole, and the expansion device also includes an actuating rod, which passes through the sleeve hole and is used to drive the expansion and extrusion end to move.

[0016] In step S2, the expansion device moves synchronously with the inner tube along the first direction.

[0017] The process includes, after step S2, a step of restoring the expansion device to its original shape and position. Restoring the original shape means that the expansion rod moves from the outside to the center. Restoring the original position means that the expansion part moves to a first predetermined position in a direction opposite to the first direction.

[0018] The first mandrel includes an inner mandrel hole, and the inner sleeve passes through the inner mandrel hole.

[0019] The inner mandrel hole passes through the first mandrel, the inner sleeve extends to the outside of the first mandrel, and the actuating rod extends to the outside of the inner sleeve.

[0020] Beneficial Effects: This invention provides a method for manufacturing paper straws, comprising the following steps: S1: A first paper strip is rotated and wound onto a first mandrel including a first outer wall and an inner mandrel hole to form an inner tube with a first tube hole. The inner tube slides along a first direction on the first outer wall. A second paper strip is rotated and wound onto a second mandrel including a second outer wall and an outer mandrel hole to form an outer tube with a second tube hole. The outer tube slides along a first direction on the second outer wall. The second mandrel is located downstream of the first mandrel, and the inner tube passes through the outer mandrel hole and is inserted into the second mandrel. S2: An expansion device located inside the first tube expands the inner tube at a first predetermined position to form an expansion section; S3: A roller pressing device located outside the outer tube rolls the outer tube at a second predetermined position to form a contraction section, wherein the inner diameter of the contraction section is less than or equal to the outer diameter of the expansion section; S4: The inner tube and the outer tube are cut to form a paper suction tube. The inner tube and the outer tube are formed simultaneously in the above manner, and the inner tube is inserted into the outer tube. The inner tube has an expansion section and the outer tube has a contraction section. The contraction section can lock the expansion section to prevent the inner tube from easily coming out of the outer tube. Attached Figure Description

[0021] Figure 1 A schematic diagram of the paper straw manufacturing apparatus according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0025] Figure 5 for Figure 1 Enlarged view of point D;

[0026] Component descriptions in the diagram:

[0027] First roller 11; first belt 12; first spindle 13; inner spindle hole 131; first outer wall 132; second roller 21; second belt 22; second spindle 23; outer spindle hole 231; second tube wall 232; inner sleeve 31; sleeve hole 311; actuating rod 32; expansion rod 33; deformation part 34; expansion and extrusion end 35; pushing surface 351; pressure roller 41; inner tube 51; first tube hole 511; expansion part 512; outer tube 52; second tube hole 521; shrinking part 522; first paper tape 501; second paper tape 502; cutter 61. Detailed Implementation

[0028] In the following description, the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] The present invention provides a method for manufacturing a paper straw, which simultaneously forms an inner tube 51 and an outer tube 52, wherein the inner tube 51 is inserted inside the outer tube 52, the inner tube 51 has an expansion portion 512 and the outer tube 52 has a contraction portion 522, the contraction portion 522 can lock the expansion portion 512 to prevent the inner tube 51 from easily coming out of the outer tube 52, and the method includes the following steps.

[0030] S1: A first paper tape 501 is rotated and wound around a first mandrel 13 including a first outer wall 132 to form an inner tube 51 with a first tube hole 511. The inner tube 51 slides along a first direction on the first outer wall 132. A second paper tape 502 is rotated and wound around a second mandrel 23 including a second outer wall 232 and an outer mandrel hole 231 to form an outer tube 52 with a second tube hole 521. The outer tube 52 slides along a first direction on the second outer wall 232. The second mandrel 23 is located downstream of the first mandrel 13, and the inner tube 51 passes through the outer mandrel hole 231 and is inserted into the second tube hole 521.

[0031] To facilitate understanding of the present invention, it will be described in conjunction with the manufacturing apparatus for producing the paper straw.

[0032] Please refer to the attached document. Figure 1 The manufacturing apparatus for the paper straw includes a first paper tube forming device for forming an inner tube 51 and a second paper tube forming device for forming an outer tube 52, wherein the second paper tube forming device is located downstream of the first paper tube forming device.

[0033] The first paper tube forming device includes a first mandrel 13 and a first driving device. The first driving device is configured to drive the first paper strip 501 to rotate and wind around the first outer wall 132 of the first mandrel 13 to form an inner tube 51, and at the same time drive the inner tube 51 to slide along the first outer wall 132 in a first direction. In this embodiment, the first direction is from left to right. Of course, in other embodiments, the first direction is other directions, such as from right to left. It is understood that the formed inner tube 51 includes a first tube hole 511 surrounded by the wall of the inner tube 51.

[0034] The first mandrel 13 is rod-shaped. The first driving device includes a pair of first rollers 11 and a first belt 12 wound around the pair of first rollers 11. The first belt 12 is driven by the pair of first rollers 11. At least a portion of the first belt 12 is wound around the first mandrel 13 at an inclined angle. The first paper tape 501 enters and is wound around the first mandrel 13 at a predetermined inclined angle. The portion of the first belt 12 wound around the first mandrel 13 winds and presses the first paper tape 501. It can be understood that when the first belt 12 moves under the drive of the first rollers 11, the first paper tape 501 will spirally wind along the axial direction of the first mandrel 13 and form an inner tube 51.

[0035] Since the first belt 12 and the first paper tape 501 are both wound around the first mandrel 13 at a certain angle, under the drive of the first belt 12, the first paper tape 501 will also slide from one end of the first mandrel 13 to the other end along the axial direction of the first mandrel 13 to form the outer tube 52, and eventually slide out. It can be understood that the direction of this sliding is the first direction.

[0036] In this embodiment, the first paper tape 501 is fed from the left side. After being wound to form the inner tube 51, the inner tube 51 is formed from left to right, that is, the first direction is from left to right.

[0037] It is understood that in this invention, the first paper tape 501 can be single-layered or multi-layered. In some embodiments, the first paper tape 501 includes two paper layers, namely a first paper layer and a second paper layer. The inner side of the first paper layer is provided with a water-repellent layer, and the inner side of the second paper layer is coated with an adhesive. The first paper layer is directly wound around the outer sidewall of the first mandrel 13, and the second paper layer is wound around and bonded to the first paper layer with the adhesive. The first and second paper layers move synchronously during the winding process, so that the sidewall of the formed inner tube 51 has a stable structure. At the same time, the inner wall of the formed inner tube 51 is water-repellent, so as to ensure the integrity of the paper straw structure when absorbing liquid. Specifically, while the first paper layer is wound around the sidewall of the first mandrel 13, the second paper layer is also wound around the first paper layer at the same time.

[0038] The second paper tube forming device is located downstream of the first paper tube forming device, and its structure is basically the same as that of the first paper tube forming device. Specifically, the second paper tube forming device includes a second mandrel 23 and a second driving device. The second driving device is configured to drive the second paper strip 502 to rotate and wind around the second mandrel 23 to form an outer tube 52, and at the same time drive the outer tube 52 to slide along the second outer wall 232 in the first direction. It can be understood that the formed outer tube 52 also includes a second tube hole 521 surrounded by the wall of the outer tube 52. The inner diameter of the second tube hole 521 is limited by the outer diameter of the second mandrel 23. Usually, the inner diameter of the second tube hole 521 is equal to the outer diameter of the second mandrel 23.

[0039] The second driving device includes a pair of second rollers 21 and a second belt 22 wound around the pair of second rollers 21. The second belt 22 is used to wind the second paper tape 502 to form an outer tube 52 and to make the outer tube 52 slide along the first direction.

[0040] The second mandrel 23 also includes an outer mandrel hole 231. The inner tube 51 passes through the outer mandrel hole 231 and is installed in the second tube hole 521. It can be understood that the second mandrel 23 includes a second axis, the first mandrel 13 includes a first axis, and the outer mandrel hole 231 includes a third axis. The third axis, the second axis, and the first axis are collinear, so that the inner tube 51 can easily pass through the outer mandrel hole 231 and be installed in the second tube hole 521.

[0041] It is understood that the inner diameter of the outer mandrel hole 231 should be greater than or equal to the outer diameter of the inner tube 51 so that the inner tube 51 can easily pass through the outer mandrel hole 231.

[0042] Furthermore, the inner tube 51 and the outer tube 52 slide at the same speed along the first direction, that is, the inner tube 51 and the outer tube 52 move synchronously along the first direction.

[0043] S2: The expansion device located in the first tube hole 511 expands the inner tube 51 at a first predetermined position to form an expansion section 512.

[0044] Please refer to this as well. Figures 2-4 The manufacturing apparatus includes an expansion device located within a first bore 511 for forming an outwardly protruding expansion portion 512 at a first predetermined position, the expansion portion 512 being used to engage with a contraction portion 522.

[0045] The expansion device includes an expansion rod 33 configured to move outward from the center and an actuating device for moving the expansion rod 33 outward. In this embodiment, the actuating device includes a deformation part 34 connected to the expansion rod 33 and an expansion compression end 35 for moving the deformation part 34. The expansion compression end 35 includes a pushing surface 351, which is inclined. The deformation part 34 includes a contact surface corresponding to the pushing surface 351. When the pushing surface 351 moves towards the contact surface, the inclination angle of the deformation part 34 increases, thereby causing the expansion rod 33 at the end of the deformation part 34 to move outward, compressing and expanding the first tube hole 511 in contact with the expansion rod 33, thereby forming an expansion part 512 in that area.

[0046] Understandably, the expansion portion 512 causes the outer wall of the inner tube 51 to bulge, thereby enabling it to cooperate with the contraction portion 522.

[0047] Understandably, since there is a gap between the inner tube 51 and the outer tube 52, which is usually slight, the bulge can be a slight protrusion. Specifically, the slight protrusion means that the difference between the outer diameter of the expanded portion 512 and the outer diameter of the non-expanded portion 512 is 0.5-1 mm.

[0048] Furthermore, the expansion device also includes an inner sleeve 31, and the deformable part 34 is disposed at the end of the inner sleeve 31 to limit the position of the deformable part 34. At the same time, it can also limit the specific position of the first predetermined position.

[0049] Furthermore, the inner sleeve 31 includes a sleeve hole 311, and the expansion device also includes an actuating rod 32. The actuating rod 32 passes through the sleeve hole 311 and is used to drive the expansion and extrusion end 35 to move. Specifically, in this embodiment, when the actuating rod 32 moves to the left relative to the inner sleeve 31, the expansion and extrusion end 35 moves to the left simultaneously, pushing the deformation part 34 to rotate or change its tilt angle, thereby causing the expansion rod 33 to expand the inner tube 51 to form the expansion part 512.

[0050] Furthermore, in order to make the expansion portion 512 undergo plastic deformation and maintain a fixed shape, during expansion, the expansion device and the inner tube 51 move synchronously along the first direction. That is, in this case, the expansion rod 33 maintains expansion pressure on the inner tube 51 at a first predetermined position, thereby causing the inner tube 51 to undergo plastic deformation at that position and form a fixed expansion portion 512.

[0051] Understandably, in this case, after step S2, there is also a step of restoring the expansion device to its original shape and position. Specifically, restoring the original shape means that the expansion rod 33 moves from the outside to the center. Specifically, restoring the original position means that the expansion part 512 moves to the first predetermined position in a direction opposite to the first direction.

[0052] Furthermore, the first mandrel 13 includes an inner mandrel hole 131, and the inner sleeve 31 passes through the inner mandrel hole 131.

[0053] Furthermore, the inner mandrel hole 131 passes through the first mandrel 13, the inner sleeve 31 extends to the outside of the first mandrel 13, and the actuating rod 32 extends to the outside of the inner sleeve 31.

[0054] S3: The roller pressing device located outside the outer tube 52 rolls the outer tube 52 at a second predetermined position to form a shrinkage portion 522, wherein the inner diameter of the shrinkage portion 522 is less than or equal to the outer diameter of the expansion portion 512.

[0055] Please refer to this as well. Figure 5 The roller pressing device includes a pressure roller 41. The pressure roller 41 rolls the outer tube 52 at a second predetermined position to form a contraction portion 522. It can be understood that the contraction portion 522 is a concave shape that is recessed towards the inner tube 51. The inner diameter of the contraction portion 522 should be less than or equal to the outer diameter of the expansion portion 512, so that the contraction portion 522 has a limiting effect on the expansion portion 512.

[0056] It is understandable that the second predetermined position is different from the first predetermined position.

[0057] In order for the inner tube 51 to be pulled out to a sufficient length, there is a gap between the first predetermined position and the second predetermined position, the gap being greater than or equal to 20 mm.

[0058] S4: Cut the inner tube 51 and the outer tube 52 to form a paper straw.

[0059] In one specific embodiment, the inner tube 51 and the outer tube 52 are cut separately, that is, the outer tube 52 is cut first, and then the inner tube 51 is cut, so that the ends of the inner tube 51 and the outer tube 52 are not flush, so that the user can easily pull out the inner tube 51.

[0060] Understandably, the inner tube 51 and the outer tube 52 are cut by the cutter 61.

[0061] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for manufacturing paper straws, characterized in that, Includes the following steps: S1: A first paper tape is rotated and wound onto a first mandrel including a first outer wall to form an inner tube with a first tube hole. The inner tube slides along a first direction on the first outer wall. A second paper tape is rotated and wound onto a second mandrel including a second outer wall and an outer mandrel hole to form an outer tube with a second tube hole. The outer tube slides along a first direction on the second outer wall. The second mandrel is located downstream of the first mandrel, and the inner tube passes through the outer mandrel hole and is inserted into the second tube hole. The second mandrel includes a second axis, the first mandrel includes a first axis, and the outer mandrel hole includes a third axis. The third axis, the second axis, and the first axis are collinear. S2: An expansion device located within the first tube hole expands the inner tube at a first predetermined position to form an expansion section; the expansion device includes an expansion rod configured to move from the center outward and an actuating device for moving the expansion rod outward, the actuating device includes a deformation section connected to the expansion rod and an expansion extrusion end for moving the deformation section, the expansion extrusion end includes a pushing surface, the pushing surface is inclined, the deformation section includes a contact surface corresponding to the pushing surface, the expansion device also includes an inner sleeve, the deformation section is disposed at the end of the inner sleeve for defining the position of the deformation section, the inner sleeve includes a sleeve hole, the expansion device also includes an actuating rod, the actuating rod passes through the sleeve hole for driving the expansion extrusion end to move, the expansion device moves synchronously with the inner tube along a first direction, the first mandrel includes an inner mandrel hole, the inner sleeve passes through the inner mandrel hole, the inner mandrel hole penetrates the first mandrel, the inner sleeve extends to the outside of the first mandrel, and the actuating rod extends to the outside of the inner sleeve. S3: The roller pressing device located on the outside of the outer tube rolls the outer tube at a second predetermined position to form a shrinkage section, wherein the inner diameter of the shrinkage section is less than or equal to the outer diameter of the expansion section; S4: Cut the inner tube and outer tube to form a paper straw.

2. The paper straw manufacturing method as described in claim 1, characterized in that, In step S1, the inner tube slides at the same speed as the outer tube in the first direction.

3. The paper straw manufacturing method as described in claim 1, characterized in that, After step S2, the expansion device is restored to its original shape and position. The restoration to the original shape means that the expansion rod moves from the outside to the center. The restoration to the original position means that the expansion part moves to a first predetermined position in a direction opposite to the first direction.

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