A raw material mixing kettle for preparing PLA layer of paper straws

Abstract

A raw material mixing kettle for preparing the PLA layer of paper straws, comprising a kettle body, a discharge hole arranged at the lower end of the kettle body, and a stirring shaft arranged in the kettle body, and also comprising a hollow limiting ring unit arranged in the kettle body and used to fix the stirring shaft, a blocking column unit arranged on the lower surface of the hollow limiting ring unit and used to open / close the discharge hole, a heating wire unit arranged in the hollow limiting ring unit, and a sleeve unit arranged at the lower end of the discharge hole and used to push the blocking column unit. By arranging the hollow limiting ring unit, the blocking column unit, the heating wire unit and the sleeve unit, the stability of the stirring shaft in the device is improved, so that the reaction system is stirred sufficiently and evenly.

Description

Technical Field

[0001] The invention belongs to the technical field of PLA film production, and specifically relates to a raw material mixing kettle for preparing a PLA layer of a paper straw. Background Art

[0002] In order to solve the problem of non-degradable plastic straws polluting the environment, paper straws came into being. Today's paper straws are mostly made by directly rolling paper into a tubular structure. Paper is made of fine fabric fibers, and there are many gaps between the fibers. When liquid contacts the surface of the paper, it will be absorbed into the paper due to capillary phenomena. When small ingredients such as pearls and taro balls are soaked and expanded in liquid, the water molecules in the small ingredients tend to run into the fine inner wall of the raw material of the paper straw, causing it to stick easily. The original plastic straws, as polymers, have a stable structure and poor water absorption, so this problem does not exist.

[0003] In order to solve the problem of paper straws absorbing moisture and softening, the prior art, such as the document with application number CN201921292238.0, discloses a paper straw, comprising a paper tubular body; a bonding layer is provided at the curling connection of the paper tubular body; an inner oil-immersed layer is provided on the inner surface of the paper tubular body; and an outer oil-immersed layer is provided on the outer surface of the paper tubular body. Although this technical solution solves the problem of paper straws' resistance to immersion, the process steps of the multi-layer straw structure are relatively cumbersome, the processing technology requirements are high, and the cost is high.

[0004] The inventors of the present invention adopt the technical solution of using PLA film as the waterproof layer of paper straws, and arrange the PLA layers on the inner and outer sides of the paper layer respectively, which can not only reduce the overall waterproof performance of paper straws, but also control the overall cost of straws, and only need to control the production standard of PLA film. The document with application number CN201920696478.0 discloses a PLA film raw material mixing and extrusion system, including a mixing tank and an extruder, the mixing tank includes a mixing tank body, a raw material conveying mechanism and a mixing mechanism; the extruder includes a body, a feed hopper is provided at the feed end of the body, the mixing outlet of the mixing tank body is connected to the feed hopper through a pipeline, an extrusion die is provided at the discharge end of the body, and a feeding auger blade is provided in the vertical direction of the feed hopper. However, the device has the following problems: since the reactor body is relatively high and the motor for driving the stirring rod to rotate is arranged at the upper end of the reactor body, during the process of stirring the material by the stirring rod, the stirring rod in the middle and lower part of the reactor body is relatively far away from the motor. Therefore, the stirring rod that is farther away from the motor shakes more, which leads to the problem of different stirring degrees of the reactants in the reactor body. In severe cases, the stirring teeth on the stirring rod may even collide with the reactor body, causing damage to parts. Moreover, as the service life of the device increases, the shaking degree of the stirring rod will become more and more serious, and the number of maintenance times and costs will increase accordingly. Summary of the invention

[0005] In view of the above-mentioned problems, one of the objects of the present invention is to provide a new type of paper straw, which achieves the purpose of making the paper straw environmentally friendly, degradable and waterproof by arranging a PLA layer inside and outside the paper layer; another object of the present invention is to provide a raw material mixing kettle for preparing the PLA layer of paper straws, which achieves the effect of improving the stability of the stirring shaft in the device and making the reaction system stirred fully and evenly by arranging a hollow limiting ring unit, a sealing column unit, a heating wire unit and a sleeve unit.

[0006] In order to achieve the first object of the present invention, the technical solution of the present invention is as follows:

[0007] A novel paper straw comprises a paper layer and a PLA layer arranged on both inner and outer sides of the paper layer.

[0008] In order to achieve the second purpose of the present invention, the technical solution of the present invention is as follows:

[0009] A raw material mixing kettle for preparing the PLA layer of paper straws, comprising a kettle body, a discharge hole arranged at the lower end of the kettle body, and a stirring shaft arranged in the kettle body, and also comprising a hollow limiting ring unit arranged in the kettle body and used to fix the stirring shaft, a blocking column unit arranged on the lower surface of the hollow limiting ring unit and used to open / close the discharge hole, a heating wire unit arranged in the hollow limiting ring unit, and a sleeve unit arranged at the lower end of the discharge hole and used to push the blocking column unit.

[0010] As a further preferred embodiment of the present invention, the hollow limit ring unit includes a limit ring sleeved on the lower end of the stirring shaft, an annular cavity arranged on the limit ring and used to install the heating wire unit, an exit hole arranged on the annular cavity and used to allow the heating wire unit to pass through, a limit column arranged on the bottom surface of the kettle body, a connecting tube arranged at the lower end of the limit ring and sleeved on the limit column, and a tension spring arranged between the limit column and the connecting tube.

[0011] As a further preferred embodiment of the present invention, the blocking column unit includes an inverted truncated cone-shaped body arranged in the discharge hole, and a cavity arranged in the inverted truncated cone-shaped body and used for installing a heating wire unit passing through the discharge hole.

[0012] As a further preferred embodiment of the present invention, the heating wire unit includes a spiral heating wire arranged in the annular cavity, and connecting wires arranged at both ends of the spiral heating wire and passing through the exit hole and the cavity.

[0013] As a further preferred embodiment of the present invention, the sleeve tube unit includes a fixed tube arranged on the lower surface of the kettle body and connected to the discharge hole, a movable tube arranged at the lower end of the fixed tube and sleeved on the outside of the fixed tube, a radial plate arranged on the movable tube for opening the discharge hole by pushing the inverted frustum-shaped body upward, and a wire hole arranged on the fixed tube and used to pass the connecting wire.

[0014] As a further preferred embodiment of the present invention, the sleeve tube unit also includes a fixed limiting ring arranged on the inner wall of the fixed tube, an annular groove arranged on the inner wall of the movable tube, a movable limiting ring portion arranged on the annular groove, and a clamping elastic ring portion arranged at the side end of the movable limiting ring portion and used to clamp the fixed tube.

[0015] As a further preferred embodiment of the present invention, the movable limiting ring portion includes a mounting ring arranged on the annular groove, a first stud arranged on the annular groove and used to fix the mounting ring, a protruding ring arranged at the end of the mounting ring and engaged with the inner wall of the movable tube, and a mounting annular groove arranged at the end of the protruding ring and used to install the clamping elastic ring portion.

[0016] As a further preferred embodiment of the present invention, the clamping elastic ring portion includes a connecting ring arranged on the mounting annular groove, an elastic ring arranged on the side end of the connecting ring and used to clamp the fixing tube, and a second stud arranged on the mounting annular groove and used to fix the elastic ring.

[0017] As a further preferred embodiment of the present invention, the hollow limiting ring unit also includes a ball disposed on the inner ring wall of the limiting ring and used for clamping the stirring shaft.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The new paper straws prepared by the present invention using PLA as the waterproof film of the paper straws have greatly reduced costs compared to pure PLA straws. At the same time, PLA, as an environmentally friendly and degradable material, will not cause environmental burden and meets market demand.

[0020] The production equipment designed in the present invention integrates the functions of fixing the stirring shaft, controlling the opening / closing state of the discharge hole, and heating the material, and has the advantages of compact structure, convenient installation and disassembly, low maintenance cost, and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a cross-sectional view of the paper straw of the present invention.

[0022] Attached Figure 2 It is a schematic diagram of the structure of the production equipment of the present invention.

[0023] Attached Figure 3 It is a schematic diagram of the position structure of the hollow limiting ring unit and the blocking column unit of the present invention.

[0024] Attached Figure 4 It is a schematic structural diagram of the heating wire unit of the present invention.

[0025] Attached Figure 5 It is a schematic diagram of the position structure of the sleeve pipe unit of the present invention.

[0026] Attached Figure 6 It is a partial structural schematic diagram of the sleeve pipe unit of the present invention.

[0027] Description of the drawings: paper layer 11, PLA layer 12, kettle body 13, discharge hole 14, stirring shaft 15, rubber ring 16, hollow limit ring unit 1, limit ring 101, annular cavity 102, discharge hole 103, limit column 104, connecting tube 105, tension spring 106, ball 107, blocking column unit 2, inverted truncated cone-shaped body 201, cavity 202, heating wire unit 3, spiral heating wire 301, connecting wire 302, sleeve tube unit 4, fixed tube 401, movable tube 402, radial plate 403, wire hole 404, fixed limit ring 405, annular groove 406, movable limit ring part 407, mounting ring 407a, first stud 407b, protruding ring 407c, mounting annular groove 407d, clamping elastic ring part 408, connecting ring 408a, elastic ring 408b, second stud 408c. DETAILED DESCRIPTION

[0028] Example

[0029] A new type of paper straw, as shown in the attached Figure 1 As shown, it includes a paper layer 11 and a PLA layer 12 arranged on both sides of the paper layer 11. In this embodiment, the thickness of the paper layer 11 is 0.1-0.3 cm, and the thickness of the PLA layer 12 is 0.02-0.05 cm, which can achieve a waterproof effect. At the same time, PLA, as an environmentally friendly and degradable material, will not cause environmental burden. At the same time, compared with pure PLA straws, the cost of this new paper straw is greatly reduced, which meets the market demand.

[0030] A raw material mixing kettle for preparing PLA layer of paper straws, as shown in the attached Figure 2As shown, it includes a kettle body 13, a discharge hole 14 arranged at the lower end of the kettle body 13, and a stirring shaft 15 arranged in the kettle body 13, and also includes a hollow limiting ring unit 1 arranged in the kettle body 13 and used to fix the stirring shaft 15, a blocking column unit 2 arranged on the lower surface of the hollow limiting ring unit 1 and used to open / close the discharge hole 14, a heating wire unit 3 arranged in the hollow limiting ring unit 1, and a sleeve unit 4 arranged at the lower end of the discharge hole 14 and used to push the blocking column unit 2.

[0031] In the prior art, the solution to the problem of the shaking of the stirring shaft 15 is generally to add a limit rod on the inner wall of the reactor to limit and fix the lower end of the stirring rod. However, this method will increase the difficulty of discharging the material. At the same time, in the reactor for preparing PLA, a heating oil coil is generally directly set on the inner wall of the reactor to heat the material. In this heating equipment, the heating oil coil is in direct contact with the material, which can easily cause the material to adhere to the heating oil coil, resulting in gelatinization of the coil surface, affecting the heating effect, and even causing damage to the coil.

[0032] In this embodiment, in order to solve the problem of the shaking of the stirring shaft 15, a hollow limiting ring unit 1 for fixing and limiting the lower end of the stirring shaft 15 is provided in this embodiment to improve the uniform stirring effect of the stirring shaft 15. At the same time, the heating wire unit 3 is provided in the hollow limiting ring unit 1 to heat the material in the kettle body. The heating wire unit 3 does not contact the material to prevent the material from adhering to the heating wire unit 3, so that the heating wire unit 3 is not affected. At the same time, the blocking column unit 2 for controlling the opening / closing of the discharge hole 14 is provided at the lower end of the hollow limiting ring unit 1 to prevent the staff from directly contacting the discharge hole 14 at the kettle body when the material is stirred and needs to be discharged. The high-temperature material may cause the staff to be scalded. In this embodiment, each component unit is based on the hollow limiting ring unit 1, which integrates the functions of fixing the stirring shaft 15, controlling the opening / closing state of the discharge hole 14, and heating the material. It has the advantages of compact structure, convenient installation and disassembly, low maintenance cost and high safety.

[0033] In this embodiment, as shown in the attached Figure 3As shown, the hollow limiting ring unit 1 includes a limiting ring 101 sleeved on the lower end of the stirring shaft 15, an annular cavity 102 provided on the limiting ring 101 and used to install the heating wire unit 3, an exit hole 103 provided on the annular cavity 102 and used to allow the heating wire unit 3 to pass through, a limiting column 104 provided on the inner bottom surface of the kettle body 13, a connecting tube 105 provided at the lower end of the limiting ring 101 and sleeved with the limiting column 104, and a tension spring 106 provided between the limiting column 104 and the connecting tube 105. The hollow limiting ring unit 1 also includes a ball 107 provided on the inner ring wall of the limiting ring 101 and used to clamp the stirring shaft 15.

[0034] In this embodiment, the inner ring surface of the limiting ring 101 is used to insert the stirring shaft 15, and at the same time, a ball 107 is arranged on the inner ring wall to clamp the stirring shaft 15, so that the stirring shaft 15 is fully clamped in the ring direction, but at the same time does not affect the rotation of the stirring shaft 15; the annular cavity 102 is a cavity arranged in the limiting ring 101, which is used to install the heating wire unit 3. The heat of the heating wire unit 3 after working is transferred to the surface of the limiting ring 101 through thermal radiation. Therefore, the material of the limiting ring 101 is preferably a metal material with strong thermal conductivity; the heating wire unit 3 used in this embodiment is an electric heating wire, so the outlet hole 103 is arranged to pass the wire through and connect to an external power supply. The wire that passes through does not contact the material, so there is no safety problem; in this embodiment, since the blocking column unit 2 is installed in the limiting ring 101 The lower surface, so the entire hollow limit ring unit 1 can move up and down with the stirring shaft 15 as the central axis, the limit column 104, the connecting tube 105, and the tension spring 106 form a buffer part. In this embodiment, two identical buffer parts are arranged on the lower surface of the limit ring 101. The functions of the buffer parts are: first, to maintain the initial state of the limit ring 101 in the absence of external force, that is, the state in which the blocking column unit 2 closes the discharge hole 14; second, when the blocking column unit 2 is lifted upward by external force, the tension spring 106 is stretched, so that the limit ring 101 is lifted smoothly and then drives the blocking column unit 2 to lift and open the discharge hole 14; third, when the external force is withdrawn, the tension spring 106 contracts and pulls the limit ring 101 down to return to the initial state, and the blocking column unit 2 closes the discharge hole 14 again.

[0035] In this embodiment, as shown in the attached Figure 3 As shown, the blocking column unit 2 includes an inverted truncated cone-shaped body 201 disposed in the discharge hole 14 , and a cavity 202 disposed in the inverted truncated cone-shaped body 201 and used for installing the heating wire unit 3 passing through the discharge hole 103 .

[0036] In this embodiment, the inverted truncated cone structure is more conducive to the rapid switching of the discharge hole 14 between the open and closed states. At the same time, a rubber ring 16 is provided on the inner wall of the discharge hole 14 to prevent material leakage. The cavity 202 is provided to protect the heating wire unit 3 to avoid contact with falling materials.

[0037] In this embodiment, as shown in the attached Figure 4 As shown, the heating wire unit 3 includes a spiral heating wire 301 arranged in the annular cavity 102, and connecting wires 302 arranged at both ends of the spiral heating wire 301 and passing through the outlet hole 103 and the cavity 202. In this embodiment, the spiral heating wire 301 is an existing heating wire on the market with high resistance; the connecting wire 302 is a wire with low resistance and covered with a foreskin.

[0038] In this embodiment, as shown in the attached Figure 5 As shown, the sleeve tube unit 4 includes a fixed tube 401 arranged on the lower surface of the kettle body 13 and connected to the discharge hole 14, a movable tube 402 arranged at the lower end of the fixed tube 401 and sleeved on the outside of the fixed tube 401, a radial plate 403 arranged on the movable tube 402 to open the discharge hole 14 by pushing the inverted frustum-shaped main body 201 upward, and a wire hole 404 arranged on the fixed tube 401 and used to pass the connecting wire 202.

[0039] In this embodiment, the length of the inverted truncated cone-shaped body 201 exceeds the lowermost end of the fixed tube 401 and then enters the movable tube 402. When the movable tube 402 is pushed to move upward, the radial plate 403 arranged on the inner wall of the movable tube 402 pushes the inverted truncated cone-shaped body 201 and then opens the discharge hole 14; the wire hole 404 is used to pass the connecting wire 202 through and connect to an external power supply; the radial plate 403 in this embodiment is preferably a circular plate with the same area as the lower surface of the inverted truncated cone-shaped body 201 in the center, and two connecting strips are arranged at both ends of the circular plate to connect to the inner wall of the movable tube 402, so as to reduce the projection area of ​​the radial plate 403 and reduce the influence on material discharge.

[0040] In this embodiment, as shown in the attached Figure 6As shown, the sleeve tube unit 4 also includes a fixed limiting ring 405 arranged on the inner wall of the fixed tube 401, an annular groove 406 arranged on the inner wall of the movable tube 402, a movable limiting ring portion 407 arranged on the annular groove 406, and a clamping elastic ring portion 408 arranged at the side end of the movable limiting ring portion 407 and used to clamp the fixed tube 401. The movable limiting ring portion 407 includes a mounting ring 407a arranged on the annular groove 406, a first stud 407b arranged on the annular groove 406 and used to fix the mounting ring 407a, a protruding ring 407c arranged at the end of the mounting ring 407a and engaged with the inner wall of the movable tube 402, and a mounting annular groove 407d arranged at the end of the protruding ring 407c and used to mount the clamping elastic ring portion 408. The clamping elastic ring portion 408 includes a connecting ring 408a arranged on the mounting annular groove 407d, an elastic ring 408b arranged on the side end of the connecting ring 408a and used to clamp the fixing tube 401, and a second stud 408c arranged on the mounting annular groove 407d and used to fix the elastic ring 408b.

[0041] In this embodiment, the fixed limiting ring 405 is used to prevent the movable tube 402 from separating from the fixed tube 401; the annular groove 406 is provided on the inner wall of the top end of the movable tube 402; the structure formed by the mounting ring 407a, the first stud 407b, and the protruding ring 407c is used to maintain the position of the movable tube 402; and the detachable structure is more convenient for assembly and replacement; at the same time, the structure of the connecting ring 408a, the elastic ring 408b, and the second stud 408c installed on the mounting annular groove 407d is used to further clamp the movable tube 402 to maintain the position of the movable tube 402; the elastic ring 408b is prone to lose its elasticity after long-term use. The second stud 408c has a clamping effect on the movable tube 402, so the detachable second stud 408c is convenient for replacing the elastic ring 408b; at the same time, in the present embodiment, the second stud 408c passes through the connecting ring 408a and the protruding ring 407 and protrudes from the lower surface of the protruding ring 407. The advantage of such a setting is that when the movable tube 402 is lifted up to the target position, the length of the second stud 408c protruding from the lower surface of the protruding ring 407 is adjusted so that the second stud 408c is abutted against the upper surface of the fixed limiting ring 405, so that the movable tube 402 is supported and will not slide down, thereby assisting the elastic ring 408b to strengthen the fixing effect on the movable tube 402.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A raw material mixing kettle for preparing a PLA layer of a paper straw, comprising a kettle body (13), a discharge hole (14) arranged at the lower end of the kettle body (13), and a stirring shaft (15) arranged in the kettle body (13), characterized in that: It also comprises a hollow limiting ring unit (1) arranged in the kettle body (13) and used to fix the stirring shaft (15), a blocking column unit (2) arranged on the lower surface of the hollow limiting ring unit (1) and used to open / close the discharge hole (14), a heating wire unit (3) arranged in the hollow limiting ring unit (1), and a sleeve pipe unit (4) arranged at the lower end of the discharge hole (14) and used to push the blocking column unit (2); The hollow limiting ring unit (1) comprises a limiting ring (101) sleeved on the lower end of the stirring shaft (15), an annular cavity (102) arranged on the limiting ring (101) and used for installing the heating wire unit (3), an exit hole (103) arranged on the annular cavity (102) and used for allowing the heating wire unit (3) to pass through, a limiting column (104) arranged on the inner bottom surface of the kettle body (13), a connecting tube (105) arranged at the lower end of the limiting ring (101) and sleeved on the limiting column (104), and a tension spring (106) arranged between the limiting column (104) and the connecting tube (105); The blocking column unit (2) comprises an inverted truncated cone-shaped body (201) arranged in the discharge hole (14), and a cavity (202) arranged in the inverted truncated cone-shaped body (201) and used for installing a heating wire unit (3) passing through the discharge hole (103); The heating wire unit (3) comprises a spiral heating wire (301) arranged in the annular cavity (102), and connecting wires (302) arranged at both ends of the spiral heating wire (301) and passing through the exit hole (103) and the cavity (202); The sleeve tube unit (4) comprises a fixed tube (401) arranged on the lower surface of the kettle body (13) and connected to the discharge hole (14), a movable tube (402) arranged at the lower end of the fixed tube (401) and sleeved outside the fixed tube (401), a radial plate (403) arranged on the movable tube (402) and opening the discharge hole (14) by pushing the inverted truncated cone-shaped body (201) upward, and a wire hole (404) arranged on the fixed tube (401) and used to pass the connecting wire (302); the radial plate (403) comprises a circular plate arranged at the center of the movable tube (402), and two connecting strips arranged at both ends of the circular plate and connected to the inner wall of the movable tube.

2. A raw material mixing kettle for preparing PLA layer of paper straws according to claim 1, characterized in that: The sleeve tube unit (4) further comprises a fixed limiting ring (405) arranged on the inner wall of the fixed tube (401), an annular groove (406) arranged on the inner wall of the movable tube (402), a movable limiting ring portion (407) arranged on the annular groove (406), and a clamping elastic ring portion (408) arranged at the side end of the movable limiting ring portion (407) and used for clamping the fixed tube (401).

3. A raw material mixing kettle for preparing PLA layer of paper straws according to claim 2, characterized in that: The movable limiting ring portion (407) comprises a mounting ring (407a) arranged on the annular groove (406), a first stud (407b) arranged on the annular groove (406) and used to fix the mounting ring (407a), a protruding ring (407c) arranged at the end of the mounting ring (407a) and engaged with the inner wall of the movable tube (402), and a mounting annular groove (407d) arranged at the end of the protruding ring (407c) and used to mount the clamping elastic ring portion (408).

4. A raw material mixing kettle for preparing PLA layer of paper straws according to claim 3, characterized in that: The clamping elastic ring portion (408) comprises a connecting ring (408a) arranged on the mounting annular groove (407d), an elastic ring (408b) arranged on the side end of the connecting ring (408a) and used to clamp the fixing tube (401), and a second stud (408c) arranged on the mounting annular groove (407d) and used to fix the elastic ring (408b).

5. The raw material mixing kettle for preparing the PLA layer of paper straws according to claim 1, characterized in that: The hollow limiting ring unit (1) further comprises a ball (107) which is arranged on the inner ring wall of the limiting ring (101) and is used to clamp the stirring shaft (15).

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