Three-machine co-extrusion equipment for multi-layer mineral degradation meal box and preparation method of multi-layer mineral degradation meal box

Abstract

The invention provides three-machine co-extrusion equipment for a multilayer mineral degradation lunch box and a preparation method of the multilayer mineral degradation lunch box. The invention discloses three-machine co-extrusion equipment for multilayer mineral degradation meal boxes. The three-machine co-extrusion equipment comprises a workbench; the three sets of storage barrels are arranged on one side of the top of the workbench, one side of each storage barrel is fixedly connected with an auger conveying pipe, and one end of each auger conveying pipe is fixedly connected with a discharging pipe. According to the three-machine co-extrusion equipment for the multi-layer mineral degradation lunch box, the three sets of material storage barrels, the auger conveying pipes and the hydraulic extrusion device are arranged, the three sets of auger conveying pipes extrude a first main material, a second main material and surface materials on the upper side and the lower side correspondingly, and the main materials on the two sides are extruded through the forming device and the discharging device; the degradable meal box thermoplastic model is simple in structure and high in practicability, accurate control and uniform distribution of the materials of all the layers can be achieved, and the quality and the use performance of a meal box are improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic lunch box production, and in particular to a three-machine co-extrusion device for a multi-layer mineral-degradable lunch box and a preparation method thereof. Background Art

[0002] In today's society, disposable lunch boxes are widely used, whether in the catering takeaway industry or in people's daily life, such as dining out. However, traditional disposable lunch boxes are mostly made of non-degradable plastics, such as polystyrene foam lunch boxes, ordinary polypropylene lunch boxes, etc. These lunch boxes are difficult to decompose naturally after use, and are piled up in the environment in large quantities, which has brought a heavy burden to the ecological environment and caused serious "white pollution" problems.

[0003] With the enhancement of environmental awareness, the demand for degradable lunch boxes is becoming more and more urgent. Among many degradable materials, mineral degradable materials have become one of the ideal choices for manufacturing environmentally friendly lunch boxes because of their good performance and degradable characteristics. However, there are many problems in the production process of mineral degradable lunch boxes on the market.

[0004] Existing lunch box manufacturing equipment and processes are difficult to achieve precise control and uniform distribution of materials in each layer when producing multi-layer mineral degradable lunch boxes. The existing technology adopts a single-machine extrusion and re-combination method, which not only has low production efficiency, but also makes it difficult to ensure the bonding strength between the layers, and is prone to stratification, which seriously affects the quality and performance of the lunch boxes.

[0005] Therefore, it is necessary to provide a three-machine co-extrusion equipment for a multi-layer mineral-degradable lunch box and a preparation method thereof to solve the above-mentioned technical problems. Summary of the invention

[0006] The present invention provides a three-machine co-extrusion device for a multi-layer mineral degradable lunch box and a preparation method thereof, which solves the problem that a single-machine extrusion and recombining method in the prior art not only has low production efficiency, but also has difficulty in ensuring the bonding strength between the layers, is prone to stratification, and seriously affects the quality and performance of the lunch box.

[0007] In order to solve the above technical problems, the present invention provides a three-machine co-extrusion device for multi-layer mineral degradable lunch boxes, comprising: a workbench;

[0008] A material storage barrel, wherein three groups of material storage barrels are respectively arranged on one side of the top of the workbench, one side of the material storage barrel is fixedly connected to an auger transport pipe, one end of the auger transport pipe is fixedly connected to a discharge pipe, one side of the top of the auger transport pipe is provided with a hydraulic extrusion device, and the outer surface of the auger transport pipe is fixedly installed with multiple heating devices at equal intervals;

[0009] A forming device is fixedly connected to one end of the discharge pipe, one side of the forming device is fixedly connected to the discharge pipe, and one end of the discharge pipe is fixedly connected to a discharge device.

[0010] Preferably, the three groups of discharge pipes are commonly connected to the surface of the forming device.

[0011] Preferably, a support frame is fixedly installed on the bottom of the discharge device.

[0012] Preferably, an assembly device is provided on the surface of the support frame by bolts, and the assembly device includes a connecting plate, a mounting plate, a servo motor and a rotating rod. A traction device is rotatably installed on the surface of the assembly device, and the traction device includes a connecting arm, a fixed block, a transmission roller, a support roller and a setting groove.

[0013] Preferably, a base is provided on one side of the outer surface of the discharge device, and a traction device is rotatably mounted on the top of the base.

[0014] Preferably, the mounting plate is installed in the middle of the support frame surface by bolts, the connecting plate is fixedly installed on the surface of the mounting plate, the servo motor is fixedly installed on the outer surface of the connecting plate, and the rotating rod is fixedly connected to the output shaft end of the servo motor.

[0015] Preferably, the connecting arm is fixedly connected to the outer surface of the rotating rod, the two fixed blocks are respectively fixedly installed on both sides of the top of the connecting arm, the setting groove is opened in the middle of one side of the fixed block, the transmission roller is rotatably installed at the top of the setting groove, and the support roller is rotatably installed at the bottom of the setting groove.

[0016] Preferably, the two fixing blocks are respectively arranged on both sides of the surface of the discharge slot of the discharge device.

[0017] Preferably, a threaded hole is provided on the surface of the top of the fixed block, a threaded rod is engaged with the internal thread of the threaded hole, a movable box is sleeved on the bottom of the outer surface of the threaded rod, a slot is provided in the middle of the bottom of the movable box, and the transmission roller is rotatably installed at the bottom of the slot through a rotating shaft.

[0018] A method for preparing a multi-layer mineral degradable lunch box is prepared by using the three-machine co-extrusion equipment for the multi-layer mineral degradable lunch box.

[0019] For the upper surface material, choose appropriate PE (polyethylene) or PP (polypropylene) as the base resin. If better flexibility and chemical resistance are required, low-density polyethylene (LDPE) can be selected. LDPE is weighed at a mass ratio of 70-80%, and 10-20% talcum powder or corn starch is added. Talc can increase the hardness of the material and reduce the shrinkage rate, while corn starch helps to increase the degradability of the material. If talcum powder is used, its fineness must meet the requirements, generally around 2000-5000 mesh; according to the required color, an appropriate amount of masterbatch can be added, usually 1-5%, and the masterbatch should have good compatibility with the base resin to ensure uniform color dispersion; if you want the upper surface to have better transparency, 1-3% of a transmittance enhancer can be added. The transmittance enhancer can improve the crystallization behavior of the material and reduce light scattering at the crystal interface.

[0020] The lower surface material can also be PE or PP. Considering the adhesion and cost with the upper material, the same resin as the upper material or a resin with good compatibility with it can be selected, and linear low-density polyethylene (LLDPE) can be used with a content of 70-80%. Mineral materials different from those of the upper material can be used, such as talcum powder or corn starch in another proportion, with a content between 10-20%, to provide different performance characteristics, such as better barrier properties or anti-slip properties. Masterbatch and stiffener can be added as needed. The stiffener can be added at 1-3% to enhance the hardness and rigidity of the lower surface. The amount of masterbatch added is the same as that of the upper layer for color matching.

[0021] One of the main materials of the inner layer is selected with a higher proportion of PE or PP, such as 80-90% high-density polyethylene (HDPE), which has high strength and toughness and is suitable as the main load-bearing structure of the lunch box; 5-10% corn starch is added as a degradation-promoting ingredient. Corn starch can be decomposed by microorganisms under certain conditions, thereby giving the lunch box a certain degree of degradability; in order to reduce bubbles in the injection molding process, 0.5-1% defoaming agent is added. The defoaming agent should be able to effectively eliminate bubbles in the plastic melt and improve the quality of the product.

[0022] The main material of the other layer can be the same PE or PP as the previous main material, or a PE / PP combination with different mixing ratios, such as a mixture of 70% PP and 30% PE, with a content of 80-90%; 3-5% talcum powder is added to enhance the rigidity and heat resistance of the material, and 0.5-1% stiffener is added to further improve the mechanical properties of the material. In order to prevent degradation during processing, an appropriate amount of antioxidant (0.1-0.3%) can be added.

[0023] Compared with the related art, the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention has the following beneficial effects:

[0024] The present invention provides a three-machine co-extrusion device for a multi-layer mineral degradable lunch box. By arranging three groups of material storage barrels, auger transport pipes and hydraulic extrusion devices, the three groups of auger transport pipes extrude a first main material, a second main material and upper and lower surface materials respectively, and the main materials on both sides and two layers of surface materials are squeezed together through a molding device and a discharging device to form a new thermoplastic model of a degradable lunch box for discharge. The device has a simple structure and strong practicality, can achieve precise control and uniform distribution of each layer of material, and improve the quality and performance of the lunch box. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a first embodiment of a three-machine co-extrusion device for a multi-layer mineral-degradable lunch box provided by the present invention;

[0026] Figure 2 A schematic structural diagram of a second embodiment of a three-machine co-extrusion device for a multi-layer mineral-degradable lunch box provided by the present invention;

[0027] Figure 3 for Figure 2 An enlarged schematic diagram of point A is shown;

[0028] Figure 4 for Figure 2 The schematic diagram of the assembly device structure shown;

[0029] Figure 5 A schematic structural diagram of a third embodiment of a three-machine co-extrusion device for a multi-layer mineral-degradable lunch box provided by the present invention;

[0030] Figure 6 for Figure 5 An enlarged schematic diagram of point B is shown.

[0031] Numbers in the figure: 1. workbench, 2. material storage barrel, 3. auger transport pipe, 4. heating device, 5. hydraulic extrusion device, 6. discharge pipe, 7. molding device, 8. discharge pipe, 9. discharge equipment, 10. support frame, 11. traction roller, 12. assembling device, 121. connecting plate, 122. mounting plate, 123. servo motor, 124. rotating rod, 13. traction device, 131. connecting arm, 132. fixing block, 133. transmission roller, 134. roller, 135. setting groove, 14. base, 15. threaded hole, 16. threaded rod, 17. moving box, 18. opening groove. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0033] Please refer to Figure 1 ,in, Figure 1The schematic diagram of the structure of the first embodiment of a three-machine co-extrusion device for a multi-layer mineral degradable lunch box provided by the present invention. The three-machine co-extrusion device for a multi-layer mineral degradable lunch box comprises: a workbench 1;

[0034] A material storage barrel 2, wherein three groups of the material storage barrels 2 are respectively arranged on one side of the top of the workbench 1, one side of the material storage barrel 2 is fixedly connected with an auger transport pipe 3, one end of the auger transport pipe 3 is fixedly connected with a discharge pipe 6, one side of the top of the auger transport pipe 3 is provided with a hydraulic extrusion device 5, and the outer surface of the auger transport pipe 3 is fixedly installed with multiple heating devices 4 at equal intervals;

[0035] The molding device 12 is fixedly connected to one end of the discharge pipe 6 , one side of the molding device 12 is fixedly connected to a discharge pipe 8 , and one end of the discharge pipe 8 is fixedly connected to a discharge device 9 .

[0036] The three groups of discharge pipes 6 are commonly connected to the surface of the forming device 7 .

[0037] A support frame 10 is fixedly mounted on the bottom of the discharge device 9 .

[0038] The working principle of the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention is as follows:

[0039] During operation, the material is first stored in the storage barrel 2, and the material inside the storage barrel 2 is transported to the hydraulic extrusion device 5 for extrusion through three sets of auger transport pipes 3, and then transported into the molding device 7 for combination through the discharge pipe 6, and the complete four-layer thermoplastic model is discharged from the discharge slot of the discharge device 9.

[0040] Compared with the related art, the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention has the following beneficial effects:

[0041] The present invention provides a three-machine co-extrusion device for a multi-layer mineral degradable lunch box. By arranging three groups of material storage barrels 2, auger transport pipes 3 and hydraulic extrusion devices 5, the three groups of auger transport pipes 3 extrude a first main material, a second main material and upper and lower surface materials respectively, and the main materials on both sides and two layers of surface materials are squeezed together through a molding device 7 and a discharging device 9 to form a new thermoplastic model of a degradable lunch box for discharge. The device has a simple structure and strong practicality, can achieve precise control and uniform distribution of each layer of material, and improve the quality and performance of the lunch box.

[0042] Second embodiment

[0043] Please refer to Figure 2 , Figure 3 and Figure 4Based on the three-machine co-extrusion device for multi-layer mineral degradable lunch boxes provided in the first embodiment of the present application, the second embodiment of the present application proposes another three-machine co-extrusion device for multi-layer mineral degradable lunch boxes. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0044] Specifically, the difference of the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided in the second embodiment of the present application is that, in the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes, the surface of the support frame 10 is provided with an assembly device 12 by bolts, and the assembly device 12 includes a connecting plate 121, a mounting plate 122, a servo motor 123 and a rotating rod 124, and a traction device 13 is rotatably installed on the surface of the assembly device 12, and the traction device 13 includes a connecting arm 131, a fixed block 132, a transmission roller 133, a support roller 134 and a setting groove 135.

[0045] A base 14 is provided on one side of the outer surface of the discharge device 9 , and a traction device 13 is rotatably mounted on the top of the base 14 .

[0046] The mounting plate 122 is installed in the middle of the surface of the support frame 10 by bolts, the connecting plate 121 is fixedly installed on the surface of the mounting plate 122, the servo motor 123 is fixedly installed on the outer surface of the connecting plate 121, and the rotating rod 124 is fixedly connected to the output shaft end of the servo motor 123.

[0047] The connecting arm 131 is fixedly connected to the outer surface of the rotating rod 124, the two fixed blocks 132 are respectively fixedly installed on both sides of the top of the connecting arm 131, the setting groove 135 is opened in the middle of one side of the fixed block 132, the transmission roller 133 is rotatably installed at the top inside the setting groove 135, and the support roller 134 is rotatably installed at the bottom inside the setting groove 135.

[0048] The two fixing blocks 132 are respectively arranged on both sides of the surface of the discharge slot of the discharge device 9 .

[0049] The mounting plate 122 is mounted in the middle of the surface of the support frame 10 by bolts, so that the assembly device 12 is installed between the discharge device 9 and the traction roller 11.

[0050] In this embodiment, the driving roller 133 and the supporting roller 134 are installed inside the setting groove 135 by rotating up and down.

[0051] The working principle of the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention is as follows:

[0052] During operation, the thermoplastic molding material is first discharged from the discharge device 9 , passes between the driving roller 133 and the supporting roller 134 , and is pulled and transported by the pulling roller 11 .

[0053] When the thermoplastic molding material deviates during transportation on the surface of the traction roller 11, the output shaft of the servo motor 123 is controlled by an external power supply to rotate to drive the rotating rod 124 to rotate, and the rotating rod 124 rotates to drive the connecting arm 131 to rotate. If the thermoplastic molding material deviates to the left, the circumferential speed of the fixed block 132, the transmission roller 133 and the supporting roller 134 at the right end is appropriately adjusted to be greater than that of the left end (for the horizontally placed traction roller 11). In this way, the thermoplastic molding material will be subjected to a rightward component force, so that it gradually returns to the correct position, and the friction force generated by the speed difference is used to change the movement direction of the thermoplastic molding material.

[0054] After the deviation correction is completed, the connecting arm 131 is controlled to maintain a horizontal state through the rotation of the output shaft of the servo motor 123 .

[0055] Compared with the related art, the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention has the following beneficial effects:

[0056] The present invention provides a three-machine co-extrusion device for a multi-layer mineral-degradable lunch box. By installing an assembly device 12 and a traction device 13 between a discharge device 9 and a traction roller 11, a thermoplastic molding material is traction-transported between a driving roller 133 and a supporting roller 134. When the thermoplastic molding material deviates during transportation on the surface of the traction roller 11, the output shaft of a servo motor 123 rotates to drive a rotating rod 124 to rotate, and the rotating rod 124 drives a connecting arm 131 to tilt, so that a fixed block 132 on one side tilts. The driving roller 133 and the supporting roller 134 inside the tilted fixed block 132 traction the thermoplastic molding material to tilt, and the thermoplastic molding material tractioned on the surface of the traction roller 11 is corrected to keep the thermoplastic molding material in a flat state when being transported and tractioned, thereby improving the regularity of the thermoplastic molding material when being injection-molded into a lunch box and improving the production efficiency of the lunch box.

[0057] Third embodiment

[0058] Please refer to Figure 5 and Figure 6 Based on the three-machine co-extrusion device for multi-layer mineral degradable lunch boxes provided in the first embodiment of the present application, the third embodiment of the present application proposes another three-machine co-extrusion device for multi-layer mineral degradable lunch boxes. The third embodiment is only a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the independent implementation of the first embodiment.

[0059] Specifically, the difference of the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided in the third embodiment of the present application is that, in the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes, a threaded hole 15 is provided on the surface of the top of the fixed block 132, and a threaded rod 16 is engaged with the internal thread of the threaded hole 15, and a movable box 17 is sleeved on the bottom of the outer surface of the threaded rod 16, and a groove 18 is provided in the middle of the bottom of the movable box 17, and the transmission roller 133 is rotatably installed on the bottom of the groove 18 through a rotating shaft.

[0060] The transmission roller 133 is rotatably installed at a position near the bottom of the slot 18 . The bottom of the transmission roller 133 is not at the same height as the moving box 17 , so that the moving box 17 does not affect the rotation between the transmission roller 133 and the support roller 134 .

[0061] The working principle of the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention is as follows:

[0062] During operation, the threaded rod 16 is first rotated to threadably engage the threaded hole 15 and move up or down. The threaded rod 16 pulls the moving box 17 to move, and the moving box 17 drives the driving roller 133 to move and adjust the height, thereby adjusting the distance between the driving roller 133 and the supporting roller 134.

[0063] Compared with the related art, the three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes provided by the present invention has the following beneficial effects:

[0064] The present invention provides a three-machine co-extrusion device for a multi-layer mineral degradable lunch box. By rotating a threaded rod 16 to threadably engage a threaded hole 15 to move up or down, the threaded rod 16 pulls a moving box 17 to drive a transmission roller 133 to move and adjust the height. The distance between the transmission roller 133 and the support roller 134 is adjusted to adapt to thermoplastic molding materials of different thicknesses. The device can pull thermoplastic molding materials of various thicknesses, thereby improving the practicality and flexibility of the device.

[0065] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes, characterized in that: include: Workbench; A material storage barrel, wherein three groups of material storage barrels are respectively arranged on one side of the top of the workbench, one side of the material storage barrel is fixedly connected to an auger transport pipe, one end of the auger transport pipe is fixedly connected to a discharge pipe, one side of the top of the auger transport pipe is provided with a hydraulic extrusion device, and the outer surface of the auger transport pipe is fixedly installed with multiple heating devices at equal intervals; A forming device is fixedly connected to one end of the discharge pipe, one side of the forming device is fixedly connected to the discharge pipe, and one end of the discharge pipe is fixedly connected to a discharge device.

2. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 1 is characterized in that: The three groups of discharge pipes are commonly connected to the surface of the forming device.

3. The three-machine co-extrusion equipment and preparation method of a multi-layer mineral degradable lunch box according to claim 1 is characterized in that: A support frame is fixedly installed at the bottom of the discharge device.

4. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 3 is characterized in that: The surface of the support frame is provided with an assembly device through bolts, and the assembly device includes a connecting plate, a mounting plate, a servo motor and a rotating rod. The surface of the assembly device is rotatably provided with a traction device, and the traction device includes a connecting arm, a fixing block, a transmission roller, a support roller and a setting groove.

5. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 1 is characterized in that: A base is arranged on one side of the outer surface of the discharge device, and a traction device is rotatably mounted on the top of the base.

6. The three-machine co-extrusion equipment for multi-layer mineral degradable lunch boxes according to claim 4 is characterized in that: The mounting plate is mounted in the middle of the support frame surface by bolts, the connecting plate is fixedly mounted on the surface of the mounting plate, the servo motor is fixedly mounted on the outer surface of the connecting plate, and the rotating rod is fixedly connected to the end of the output shaft of the servo motor.

7. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 4 is characterized in that: The connecting arm is fixedly connected to the outer surface of the rotating rod, the two fixed blocks are respectively fixedly installed on both sides of the top of the connecting arm, the setting groove is opened in the middle of one side of the fixed block, the transmission roller is rotatably installed at the top of the setting groove, and the support roller is rotatably installed at the bottom of the setting groove.

8. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 4, characterized in that: The two fixing blocks are respectively arranged on two sides of the surface of the discharge slot of the discharge device.

9. The three-machine co-extrusion equipment for multi-layer mineral-degradable lunch boxes according to claim 4, characterized in that: A threaded hole is provided on the surface of the top of the fixed block, a threaded rod is engaged with the internal thread of the threaded hole, a movable box is sleeved on the bottom of the outer surface of the threaded rod, a slot is provided in the middle of the bottom of the movable box, and the transmission roller is rotatably installed at the bottom of the slot through a rotating shaft.

10. A method for preparing a multi-layer mineral degradable lunch box, characterized in that: The multi-layer mineral degradable lunch box is prepared using a three-machine co-extrusion device as described in any one of claims 1 to 9.

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