Paper straw manufacturing device

Abstract

This invention provides a paper straw manufacturing apparatus, comprising a first paper tube forming device for forming an outer tube and a second paper tube forming device for forming an inner tube; the first paper tube forming device includes a first mandrel, and the second paper tube forming device includes a second mandrel; the outer diameter of the first mandrel is larger than the outer diameter of the inner tube, and after the outer tube and the inner tube slide in a relatively close direction, the inner tube is inserted into the outer tube; the first mandrel also includes a shaft end located on the movement path of the inner tube, and includes an expansion device for forming an expansion section at the end of the inner tube; the second paper tube forming device also includes a guide device located on the movement path of the outer tube, and includes a shrinking device for forming a shrinking section at the end of the outer tube, the inner diameter of the shrinking section being less than or equal to the outer diameter of the expansion section; by simultaneously forming the inner tube and the outer tube and utilizing the movement during the forming process of the inner tube and the outer tube, the inner tube is inserted into the outer tube, and anti-detachment shrinking and expansion sections are formed, greatly improving efficiency and making the paper straw less prone to detachment.

Description

Technical Field

[0001] This invention relates to a paper straw manufacturing apparatus. 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 exacerbated the problem of plastic waste. Against this backdrop, environmentally friendly paper straw alternatives have attracted much attention due to their biodegradable properties. 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] To address these technical problems, the present invention provides a paper straw manufacturing apparatus.

[0006] A paper straw manufacturing apparatus includes a first paper tube forming device for forming an outer tube and a second paper tube forming device for forming an inner tube. The first paper tube forming device includes a first mandrel and a first driving device. The first driving device is configured to drive a first paper strip to rotate and wind around the first mandrel to form an outer tube, and at the same time drive the outer tube to slide along the first axis of the first mandrel and in a first direction. The second paper tube forming device includes a second mandrel and a second driving device. The second driving device is configured to drive a second paper strip to rotate and wind around the second mandrel to form an inner tube, and at the same time drive the inner tube to slide along the second axis of the second mandrel and in a second direction. The second axis is collinear with the first axis, the second direction is opposite to the first direction, the outer diameter of the first mandrel is larger than the outer diameter of the inner tube, and the outer tube and the inner tube slide in a relatively close direction so that the inner tube is inserted into the outer tube. The first mandrel further includes a shaft end located on the inner tube's movement path and includes an expansion device for forming an expansion section at the end of the inner tube. The second paper tube forming device further includes a guide device located on the outer tube's movement path and includes a contraction device for forming a contraction section at the end of the outer tube, wherein the inner diameter of the contraction section is less than or equal to the outer diameter of the expansion section.

[0007] The inner tube includes an inner main body and an expansion section, and the outer tube includes an outer main body and a contraction section. There is a gap between the inner main body and the outer main body, and the gap is 0.4 to 1.5 mm.

[0008] The expansion device includes an expansion guide surface facing the second mandrel. The expansion guide surface includes an outer ring surface and an inclined surface. The outer diameter of the outer ring surface is larger than the inner diameter of the inner tube. When the inner tube moves towards the shaft end, the outer ring surface presses outward against the inner wall of the inner tube and expands to form an expansion section.

[0009] The shaft end further includes a first abutting portion, which is located at the end of the outer ring surface and includes a first abutting surface perpendicular to the outer ring surface.

[0010] The guiding device includes a contraction guide surface facing the first mandrel, comprising an inner ring surface and an inclined guide surface. The inner diameter of the inner ring surface is smaller than the outer diameter of the outer tube. When the outer tube moves in the direction of the guiding device, the inner ring surface presses inward against the outer wall of the outer tube and contracts to form a contraction section.

[0011] The guiding device further includes a second contact portion, which is located at the end of the inner ring surface and includes a second contact surface perpendicular to the inner ring surface.

[0012] The guiding device is provided with a guiding part on the side opposite to the contraction guide surface. The guiding part includes a guiding section and a limiting section. The guiding section has a channel with a gradually narrowing opening, and the limiting section is a cylindrical hole.

[0013] The axis of the cylindrical hole is collinear with the first axis, and the inner diameter of the cylindrical hole is smaller than the inner diameter of the outer tube and greater than or equal to the outer diameter of the inner tube.

[0014] The first paper tube forming device further includes a first cutter for cutting the outer tube, the second paper tube forming device further includes a second cutter for cutting the inner tube, and the paper straw manufacturing device further includes a clamping device for clamping and fixing the formed paper straw.

[0015] The first paper tube forming device is configured to move movably away from the clamping device, and the second paper tube forming device is configured to move movably away from the clamping device.

[0016] Beneficial Effects: This invention provides a paper straw manufacturing apparatus, comprising a first paper tube forming device for forming an outer tube and a second paper tube forming device for forming an inner tube. The first paper tube forming device includes a first mandrel, and the second paper tube forming device includes a second mandrel. The outer diameter of the first mandrel is larger than the outer diameter of the inner tube. After the outer tube and the inner tube slide in a relatively close direction, the inner tube is inserted into the outer tube. The first mandrel also includes a shaft end located on the inner tube's movement path and includes an expansion device for forming an expansion section at the end of the inner tube. The second paper tube forming device also includes a guide device located on the outer tube's movement path and includes a contraction device for forming a contraction section at the end of the outer tube. The inner diameter of the contraction section is less than or equal to the outer diameter of the expansion section. By simultaneously forming the inner and outer tubes and utilizing the movement during the forming process of the inner and outer tubes, the inner tube is inserted into the outer tube, forming an anti-detachment contraction section and an expansion section, significantly improving efficiency and making it less likely for the paper straw to detach. Attached Figure Description

[0017] Figure 1 A schematic diagram of the paper straw manufacturing apparatus according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Component descriptions in the diagram: First axis 101; Second axis 102; First spindle 11; Shaft end 110; First contact part 111; Expansion guide surface 112; First belt 12; First roller 13; First cutter 14; Second spindle 21; Second belt 22; Second roller 23; Second cutter 24; Guide device 25; Guide section 251; Limiting section 252; Second contact part 253; Shrink guide surface 254; Paper suction tube 30; Gap 301; Outer tube 31; Outer main body 310; First paper tape 3100; Shrink section 311; Inner tube 32; Inner main body 320; Second paper tape 3200; Expansion section 321; Clamping device 40. Detailed Implementation

[0018] 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.

[0019] Please refer to the attached document. Figure 1This invention provides a paper straw manufacturing apparatus for manufacturing paper straws 30 with telescopic characteristics. The paper straw 30 includes an inner tube 32 and an outer tube 31. The inner tube 32 has an expansion section 321, and the outer tube 31 has a contraction section 311. The contraction section 311 restricts the expansion section 321 from detaching, thereby preventing the inner tube 32 and the outer tube 31 from separating.

[0020] The paper straw manufacturing apparatus includes a first paper tube forming device for forming an outer tube 31 and a second paper tube forming device for forming an inner tube 32.

[0021] The first paper tube forming device includes a first mandrel 11 and a first driving device. The first driving device is configured to drive the first paper strip 3100 to rotate and wind around the first mandrel 11 to form an outer tube 31, and at the same time drive the outer tube 31 to slide along the first axis 101 of the first mandrel 11 and in a first direction.

[0022] The first mandrel 11 is generally cylindrical in shape. The first driving device includes a pair of first rollers 13 and a first belt 12 wound around the pair of first rollers 13. The first belt 12 is driven by the pair of first rollers 13. At least a portion of the first belt 12 is wound around the first mandrel 11 at an inclined angle. The first paper tape 3100 enters and is wound around the first mandrel 11 at a predetermined inclined angle. The portion of the first belt 12 wound around the first mandrel 11 winds and presses the first paper tape 3100. It can be understood that when the first belt 12 moves under the drive of the first rollers 13, the first paper tape 3100 will spirally wind along the axial direction of the first mandrel 11 to form an outer tube 31.

[0023] Since the first belt 12 and the first paper tape 3100 are both wound around the first mandrel 11 at a certain angle, under the drive of the first belt 12, the first paper tape 3100 will also slide from one end of the first mandrel 11 to the other end along the axial direction of the first mandrel 11 to form the outer tube 31 while spirally winding along the axial direction of the first mandrel 11 to form the outer tube 31, and eventually slide out.

[0024] In this embodiment, the first paper tape 3100 is fed from the left side. After being wound to form the outer tube 31, the outer tube 31 is formed from left to right. For ease of description, the direction from left to right is referred to as the first direction. That is, the outer tube 31 moves along the axis of the first mandrel 11 and along the first direction while being formed.

[0025] It is understood that in this invention, the first paper tape 3100 can be single-layered or multi-layered. In some embodiments, the first paper tape 3100 includes two paper layers, wherein 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 11, 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 outer tube 31 has a stable structure. At the same time, the inner wall of the formed outer tube 31 is water-repellent, so as to ensure the integrity of the paper straw 30 structure when absorbing liquid. Specifically, while the first paper layer is wound around the sidewall of the first mandrel 11, the second paper layer is also wound around the first paper layer at the same time.

[0026] The structure of the second paper tube forming device is basically the same as that of the first paper tube forming device. Specifically, the second paper tube forming device includes a second mandrel 21 and a second driving device. The second driving device is configured to drive the second paper strip 3200 to rotate and wind around the second mandrel 21 to form an inner tube 32, and at the same time drive the inner tube 32 to slide along the second axis 102 of the second mandrel 21 and along the second direction.

[0027] The second driving device includes a pair of second rollers 23 and a second belt 22 wound around the pair of second rollers 23. The second belt 22 winds the second paper tape 3200 to form an inner tube 32 and causes the inner tube 32 to slide along the second direction.

[0028] It is understood that the second axis 102 is collinear with the first axis 101, and the second direction is opposite to the first direction. More specifically, in this embodiment, the second direction is from right to left, so that the formed outer tube 31 and inner tube 32 can move in a direction that approaches each other, and finally the inner tube 32 is inserted into the outer tube 31.

[0029] Understandably, when forming the outer tube 31, the inner diameter of the outer tube 31 is limited by the outer diameter of the first mandrel 11. More specifically, the inner diameter of the formed outer tube 31 is equal to the outer diameter of the first mandrel 11. Therefore, the outer diameter of the first mandrel 11 should be greater than the outer diameter of the inner tube 32, so that the inner tube 32 can be smoothly inserted into the outer tube 31. At the same time, since the outer diameter of the inner tube 32 is the sum of the inner diameter of the inner tube 32 and the wall thickness of the inner tube 32, and the inner diameter of the inner tube 32 is limited by the outer diameter of the second mandrel 21, the outer diameter of the first mandrel 11 should be greater than the sum of the outer diameter of the second mandrel 21 and the wall thickness of the inner tube 32.

[0030] Furthermore, there is a gap 301 between the outer tube 31 and the inner tube 32, so that the inner tube 32 can be more easily inserted into the outer tube 31. It can be understood that the gap 301 is the difference between the inner diameter of the outer tube 31 and the outer diameter of the inner tube 32.

[0031] Furthermore, the gap 301 is 0.4 to 1.5 mm, so that the contraction section 311 and the expansion section 321 can be easily formed, and the expansion section 321 can be restricted from detaching by the contraction section 311.

[0032] In this embodiment, the first mandrel 11 further includes a shaft end 110, which is located on the movement path of the inner tube 32 and includes an expansion device for forming an expansion section 321 at the end of the inner tube 32. The second paper tube forming device further includes a guide device 25, which is located on the movement path of the outer tube 31 and includes a contraction device for forming a contraction section 311 at the end of the outer tube 31. The inner diameter of the contraction section 311 is less than or equal to the outer diameter of the expansion section 321, so as to restrict the dislodgement of the expansion section 321.

[0033] In this embodiment, the shaft end 110 is located at the end of the first mandrel 11. The expansion device includes an expansion guide surface 112 facing the second mandrel 21. The expansion guide surface 112 includes an outer annular surface and an inclined surface. The outer diameter of the outer annular surface is larger than the inner diameter of the inner tube 32, so that when the inner tube 32 moves toward the shaft end 110, the inner wall of the inner tube 32 moves to the expansion guide surface 112. The expansion guide surface 112 squeezes and expands the inner radial direction of the inner tube 32, thereby forming an expansion section 321. It can be understood that since the outer diameter of the outer annular surface is larger than the inner diameter of the inner tube 32, the outer wall of the inner tube 32 expands outward synchronously during expansion, so that the outer diameter of the expansion section 321 is larger than the outer diameter of the inner main body 320. The inner main body 320 is the unexpanded part of the inner tube 32.

[0034] Furthermore, the shaft end 110 also includes a first abutting portion 111, which is located at the end of the outer ring surface and is used to limit the length of the expansion section 321 and the position of the inner tube 32. The first abutting portion 111 includes a first abutting surface perpendicular to the outer ring surface, which can abut against the end face of the inner tube 32, thereby limiting the length of the expansion section 321 and the position of the inner tube 32.

[0035] The guiding device 25 includes a contraction guide surface 254 facing the first spindle 11. The contraction guide surface 254 is in the shape of a gradually contracting flared mouth and includes an inner annular surface and an inclined guide surface. The inner diameter of the inner annular surface is smaller than the outer diameter of the outer tube 31, so that when the outer tube 31 moves in the direction of the guiding device 25, the outer side of the outer tube 31 moves to the contraction guide surface 254. The contraction guide surface 254 presses the outer side of the outer tube 31 inward and contracts it, thereby forming a contraction section 311. It can be understood that the contraction causes the inner wall of the outer tube 31 to contract inward synchronously, so that the inner diameter of the contraction section 311 is smaller than the inner diameter of the outer body part 310. The outer body part 310 is the uncontracted part of the outer tube 31.

[0036] Understandably, there is still a gap 301 between the outer main body 310 and the inner main body 320, which makes it relatively easy for the inner tube 32 and the outer tube 31 to expand and contract. When the inner tube 32 is pulled outward in the first direction, the expansion section 321 of the inner tube 32 moves in the first direction to the position of the contraction section 311 of the outer tube 31. The contraction section 311 of the outer tube 31 restricts the expansion section 321 of the inner tube 32, thereby preventing it from coming out.

[0037] Furthermore, the guiding device 25 also includes a second contact portion 253, which is located at the end of the inner ring surface and is used to limit the length of the contraction and the position of the outer tube 31. The second contact portion 253 includes a second contact surface perpendicular to the inner ring surface, which can abut against the end face of the outer tube 31, thereby limiting the length of the contraction section 311 and the position of the outer tube 31.

[0038] Furthermore, in order to stably insert the inner tube 32 into the outer tube 31, the guiding device 25 is provided with a guiding part on the side opposite to the contraction guide surface 254. The guiding part includes a guiding section 251 and a limiting section 252. The guiding section 251 has a channel with a gradually narrowing opening, making the guiding section 251 funnel-shaped. The limiting section 252 is a cylindrical hole, and the axis of the cylindrical hole is collinear with the first axis 101. At the same time, the inner diameter of the cylindrical hole is smaller than the inner diameter of the outer tube 31 and equal to or only slightly larger than the outer diameter of the inner tube 32, so that the inner tube 32 can stably enter the outer tube 31 when moving in the second direction.

[0039] Understandably, in this embodiment, since the gap 301 between the inner tube 32 and the outer tube 31 is small, the expansion section 321 and the contraction section 311 can expand and contract only slightly to prevent the inner tube 32 and the outer tube 31 from coming off.

[0040] Furthermore, the first paper tube forming device also includes a first cutter 14 for cutting the outer tube 31, the second paper tube forming device also includes a second cutter 24 for cutting the inner tube 32, and the paper straw manufacturing device also includes a clamping device 40 for clamping and fixing the formed paper straw 30. It can be understood that the clamping device 40 is located between the first paper tube forming device and the second paper tube forming device and clamps the middle part of the paper straw 30.

[0041] Furthermore, the first paper tube forming device is also configured to move movably away from the clamping device 40, and the second paper tube forming device is configured to move movably away from the clamping device 40, so that after the first cutter 14 cuts the outer tube 31 and the second cutter 24 cuts the inner tube 32, the first paper tube forming device moves away from the clamping device 40 and the second paper tube forming device moves away from the clamping device 40, thereby causing the shaft end 110 to disengage from the outer tube 31, and causing the second mandrel 21 and the guide device 25 to disengage from the inner tube 32 and the outer tube 32, respectively.

[0042] 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 paper straw manufacturing apparatus, comprising a first paper tube forming device for forming an outer tube and a second paper tube forming device for forming an inner tube, characterized in that: The first paper tube forming device includes a first mandrel and a first driving device. The first driving device is configured to drive a first paper strip to rotate and wind around the first mandrel to form an outer tube, and at the same time drive the outer tube to slide along the first axis of the first mandrel and in a first direction. The second paper tube forming device includes a second mandrel and a second driving device. The second driving device is configured to drive a second paper strip to rotate and wind around the second mandrel to form an inner tube, and at the same time drive the inner tube to slide along the second axis of the second mandrel and in a second direction. The second axis is collinear with the first axis, the second direction is opposite to the first direction, the outer diameter of the first mandrel is larger than the outer diameter of the inner tube, and the outer tube and the inner tube slide in a relatively close direction so that the inner tube is inserted into the outer tube. The first mandrel further includes a shaft end located on the inner tube's movement path and includes an expansion device for forming an expansion section at the end of the inner tube. The second paper tube forming device further includes a guide device located on the outer tube's movement path and includes a shrinking device for forming a shrinking section at the end of the outer tube, wherein the inner diameter of the shrinking section is less than or equal to the outer diameter of the expansion section. The guiding device includes a contraction guide surface facing the first mandrel, including an inner ring surface and an inclined guide surface. The inner diameter of the inner ring surface is smaller than the outer diameter of the outer tube. When the outer tube moves in the direction of the guiding device, the inner ring surface presses inward against the outer wall of the outer tube and contracts to form a contraction section. The guiding device further includes a second abutment portion, which is located at the end of the inner ring surface and includes a second abutment surface perpendicular to the inner ring surface; The guiding device is further provided with a guiding part on the side opposite to the contraction guide surface. The guiding part includes a guiding section and a limiting section. The guiding section has a channel with a gradually narrowing opening, and the limiting section is a cylindrical hole. The axis of the cylindrical hole is collinear with the first axis. At the same time, the inner diameter of the cylindrical hole is smaller than the inner diameter of the outer tube and greater than or equal to the outer diameter of the inner tube.

2. The paper straw manufacturing apparatus as described in claim 1, characterized in that, The inner tube includes an inner main body and an expansion section, and the outer tube includes an outer main body and a contraction section. There is a gap between the inner main body and the outer main body, and the gap is 0.4 to 1.5 mm.

3. The paper straw manufacturing apparatus as described in claim 1, characterized in that, The expansion device includes an expansion guide surface facing the second mandrel. The expansion guide surface includes an outer ring surface and an inclined surface. The outer diameter of the outer ring surface is larger than the inner diameter of the inner tube. When the inner tube moves towards the shaft end, the outer ring surface presses outward against the inner wall of the inner tube and expands to form an expansion section.

4. The paper straw manufacturing apparatus as described in claim 3, characterized in that, The shaft end also includes a first abutting portion, which is located at the end of the outer ring surface and includes a first abutting surface perpendicular to the outer ring surface.

5. The paper straw manufacturing apparatus as described in claim 1, characterized in that, The first paper tube forming device further includes a first cutter for cutting the outer tube, the second paper tube forming device further includes a second cutter for cutting the inner tube, and the paper straw manufacturing device further includes a clamping device for clamping and fixing the formed paper straw.

6. The paper straw manufacturing apparatus as described in claim 5, characterized in that, The first paper tube forming device is also configured to move movably away from the clamping device, and the second paper tube forming device is configured to move movably away from the clamping device.

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