Co-extrusion production mechanism for plastic substrate floors

Abstract

The present invention discloses a co-extrusion production mechanism for plastic substrate floors, wherein: the material production main machine is used to plasticize plastic raw materials through heating to obtain plasticized materials, and input the plasticized materials into a co-extrusion die; the co-extrusion die has a plurality of independent flow channels corresponding to each plasticized material, and the outlets of the independent flow channels converge at a mixing flow channel. Various plasticized materials enter the mixing flow channel through the outlets of the independent flow channels to form a multi-layer plastic substrate, and the plastic substrate enters a roll sizing machine through the mixing flow channel; the roll sizing machine has at least one set of roll groups, and the roll group includes two rolls, namely an upper roll and a lower roll. The upper roll is arranged on the upper side of the plastic substrate, and the lower roll is arranged on the lower side of the plastic substrate. The roll group performs thickness sizing on the plastic substrate by rotational extrusion. By adopting the above technical solutions, the bonding effect between the plates is ideal, and the number of devices is reduced, the process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of floor production and manufacturing, and particularly to a co-extrusion production mechanism for plastic substrate floors. Background Art

[0002] WPC floors, SPC floors, LVT floors, halogen-free board floors, etc. are all new types of decorative plastic floors on the market in recent years, and their main raw materials are polyvinyl chloride, calcium powder, etc. These plastic floors have the advantages of being light, thin, wear-resistant, and highly elastic, and have the functions of fire prevention and flame retardancy, water absorption and moisture prevention, and sound absorption and noise prevention. They have been recognized by the market and are widely used.

[0003] The production process of such floors can be summarized as follows: the raw materials are formed into a paste (plasticized) in the barrel of the extruder under high temperature, vacuum, and negative pressure, extruded into a sheet shape through a die, and then enter a roller calender to form a substrate with a fixed thickness. Anti-slip, wear-resistant, and sound-absorbing materials are adhered to the surface and bottom with glue. Then, the surface is subjected to wear-resistant protection treatment on the UV paint hanging coating production line, and then the substrate is sliced and grooved by a grooving machine, and finally packaged as a finished product.

[0004] However, in the conventional process, after the raw materials are plasticized in the barrel, they are extruded into a sheet shape through a die and then enter a roller calender to form a substrate with a fixed thickness. The properties of the obtained sheets vary greatly. Some sheets are light in structure but lack sufficient surface hardness, while some sheets have sufficient surface hardness but are high in density and heavy in mass. Therefore, in order to make up for the performance defects of various sheets, sheets made of materials with different properties need to be glued and pressed into a whole. Such a process requires a large number of devices such as an extruder production line, a gluing machine, and a press, with a complex process and high production costs. It cannot meet the new era requirements of energy conservation, environmental protection, high production, and low energy consumption, and the gluing effect is not ideal. There is a possibility of sheet detachment after long-term use. Summary of the Invention

[0005] Object of the Invention: The present invention provides a co-extrusion production mechanism for plastic substrate floors. A plurality of independent flow channels and a mixing flow channel are arranged in the co-extrusion die, and a multi-layer plasticized material of different types of raw materials is formed in the mixing flow channel. Then, a multi-layer sheet is obtained through the calendering and thickness fixing of a roller shaping machine. The lamination effect is ideal, and the number of devices is reduced, the process is simplified, and the production cost is reduced. Further, by arranging a water flow channel in the roller, a hardened surface can be formed on the surface of the sheet during the process of calendering and thickness fixing the sheet, avoiding the diffusion of air bubbles inside the sheet to the surface of the sheet.

[0006] Technical solution: The present invention provides a co-extrusion production mechanism for plastic substrate floors, including: a material production main machine, a co-extrusion die, and a roller shaping machine, where: The material production main machine is used to plasticize plastic raw materials by heating to obtain plasticized materials and input the plasticized materials into the co-extrusion die; The co-extrusion die has a plurality of independent flow channels corresponding to each plasticized material. The position sorting of the plasticized materials in the plastic substrate is consistent with the outlet position sorting of the independent flow channels. The outlets of the independent flow channels converge into a mixed flow channel. Various plasticized materials enter the mixed flow channel through the outlets of the independent flow channels to form a multi-layer plastic substrate. The plastic substrate enters the roller shaping machine through the mixed flow channel; The roller shaping machine has at least one set of roller groups. The roller group includes two rollers, namely an upper roller and a lower roller. The upper roller is arranged on the upper side of the plastic substrate, and the lower roller is arranged on the lower side of the plastic substrate. The roller group performs thickness determination on the plastic substrate by rotational extrusion.

[0007] Specifically, an extrusion notch is arranged at the inlet of the independent flow channel, and the height of the extrusion notch is less than the height of the independent flow channel where it is located.

[0008] Specifically, in the independent flow channel, the channel height between the area near the outlet and the outlet gradually decreases.

[0009] Specifically, the height of the outlet of the independent flow channel is greater than the thickness of the corresponding material layer in the plastic substrate.

[0010] Specifically, a weight detection unit is arranged at the outlet of the independent flow channel to detect the weight of the plasticized material of a standard length output by the independent flow channel and give a prompt when the weight is lower than the standard weight.

[0011] Specifically, a water flow channel is arranged inside the roller in the roller group for inputting coolant.

[0012] Specifically, a plurality of water flow channels are arranged inside the roller. The water flow channels are arc-shaped, and a plurality of arc-shaped water flow channels form a circular water flow channel.

[0013] Specifically, a plurality of circular water flow channels are arranged at intervals inside the roller, and the circular water flow channels of the upper roller and the lower roller are arranged staggeredly.

[0014] Specifically, the roller shaping machine includes a first roller group and a second roller group. The length of the rollers in the first roller group is shorter than the length of the plastic substrate. The plastic substrate enters the second roller group after passing through the first roller group; The midlines of the first roller group and the second roller group are consistent with the midline of the plastic substrate.

[0015] Specifically, the roll calender further includes a third roll group. The rolls of the second roll group are longer than those of the first roll group and shorter than the length of the plastic substrate. The rolls of the third roll group are not shorter than the length of the plastic substrate. After passing through the second roll group, the plastic substrate enters the third roll group. The midline of the third roll group is aligned with the midline of the plastic substrate.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: multi-layer plasticized materials of different types of raw materials are formed in the mixing channel, with an ideal laminating effect, and the number of equipment is reduced, the process is simplified, and the production cost is lowered. Further, a hardened surface is formed on the surface of the sheet to prevent air bubbles inside the sheet from diffusing to the surface of the sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the production line of the plastic substrate floor provided by the present invention;

[0018] Figure 2 is a schematic structural diagram of the co-extrusion die provided by the present invention;

[0019] Figure 3 is a schematic side view of the roll provided by the present invention;

[0020] Figure 4 is a schematic front view of the roll provided by the present invention;

[0021] Figure 5 is a top view of the roll calender provided by the present invention;

[0022] 1 - roll; 2 - water flow channel; 3 - circular water flow channel; 4 - first roll group; 5 - second roll group; 6 - third roll group. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0024] Refer to Figure 1 , which is a schematic structural diagram of the production line of the plastic substrate floor provided by the present invention; refer to Figure 2 , which is a schematic structural diagram of the co-extrusion die provided by the present invention.

[0025] The present invention provides a co-extrusion production mechanism for plastic substrate floors, including: a material production main machine, a co-extrusion die, and a roller shaping machine, wherein: the material production main machine is used to plasticize plastic raw materials by heating to obtain plasticized materials, and input the plasticized materials into the co-extrusion die; the co-extrusion die has a plurality of independent channels corresponding to each plasticized material, and the position sorting of the plasticized materials in the plastic substrate is consistent with the outlet position sorting of the independent channels. The outlets of the independent channels converge into a mixing channel, and various plasticized materials enter the mixing channel through the outlets of the independent channels to form a multi-layer plastic substrate. The plastic substrate enters the roller shaping machine through the mixing channel; the roller shaping machine has at least one set of roller groups, and the roller group includes two rollers, namely an upper roller and a lower roller. The upper roller is arranged on the upper side of the plastic substrate, and the lower roller is arranged on the lower side of the plastic substrate. The roller group performs thickness setting on the plastic substrate by rotational extrusion.

[0026] In a specific implementation, in different material production main machines, different plastic raw materials are plasticized, and multiple material production main machines input the plasticized materials into the corresponding independent channels of the co-extrusion die. Each plasticized material enters the mixing channel from the outlet of the independent channel. Since the position sorting of the plasticized materials in the plastic substrate is consistent with the outlet position sorting of the independent channels, therefore, when multiple plasticized materials enter the mixing channel, the formed multi-layer plastic substrate has the same layer position sorting for each plasticized material as that of the required target substrate. The plasticized substrate is output from the outlet of the mixing channel, extruded into a sheet shape, and enters the roller shaping machine, where it is calendered and thickness-set under the rotational action of the roller group.

[0027] In a specific implementation, the distance between the upper roller and the lower roller is consistent with the thickness of the required target substrate, and the thickness of the sheet-shaped plasticized material extruded from the mixing channel usually does not meet the thickness of the target substrate. Therefore, the thickness is determined by the extrusion and extension of the roller group, and thus the standard thickness can be achieved.

[0028] In a specific implementation, multiple plasticized materials are calendered and thickness-set in a plasticized state. There is a certain fusion between the materials, and there is a mixing area of the two materials at the junction of different materials. Its bonding degree and integrity are significantly improved compared with the gluing process, and there is no possibility of detachment during long-term use. At the same time, the equipment required for gluing is reduced, the process is simplified, and the cost is reduced.

[0029] In a specific implementation, there is room for improvement in the process of co-extruding multiple materials using a co-extrusion die. Specifically, after the sheet-shaped plasticized substrate is output from the co-extrusion die, there will be small bubbles inside. As the pressure is released, the tiny bubbles will diffuse and rise until they break through the surface of the substrate, affecting the beauty of the board. Excessive bubbles may also affect the integrity and reliability of the board.

[0030] In the embodiment of the present invention, an extrusion notch is provided at the entrance of the independent flow channel, and the height of the extrusion notch is less than the height of the corresponding independent flow channel.

[0031] In a specific implementation, to solve the problem of air bubbles in the plasticized base material, an extrusion notch is provided at the entrance of the independent flow channel, and the height of the extrusion notch is adjustable. By adjusting it to half of the height of the independent flow channel, after the plasticized material is output from the production main machine, it enters the independent flow channel through the extrusion notch, and the gas in the plasticized material can be better extruded in the flowing state, avoiding the generation of air bubbles.

[0032] In the embodiment of the present invention, in the independent flow channel, the channel height between the area near the outlet and the outlet gradually decreases.

[0033] In a specific implementation, the channel height between the area near the outlet and the outlet gradually decreases, which is also to better extrude the gas in the plasticized material in the flowing state and avoid the generation of air bubbles.

[0034] In the embodiment of the present invention, the height of the outlet of the independent flow channel is greater than the thickness of the corresponding material layer in the plastic base material.

[0035] In a specific implementation, for example, the thickness of the material layer of A plasticized material in the plastic base material is a, then the height of the outlet of A plasticized material is greater than a. The reason is that to leave a certain space for the calendering and thickness fixing of the roller calender, and in addition, the air bubbles inside can also be pressed out by the extrusion of the rollers.

[0036] In the embodiment of the present invention, a weight detection unit is provided at the outlet of the independent flow channel, which is used to detect the weight of the plasticized material of a standard length output by the independent flow channel and give a prompt when the weight is lower than the standard weight.

[0037] In a specific implementation, the standard length can be set by the user according to the actual application scenario. In the sheet-shaped plasticized material extruded by the co-extrusion die, if there are too many air bubbles, it will inevitably affect the weight. Therefore, in the case of a lower weight, it means that the air volume inside is larger enough to affect the quality of the plastic base material.

[0038] In the embodiment of the present invention, a water flow channel is provided inside the roller in the roller group for inputting coolant.

[0039] In specific implementation, in order to overcome the problem of air bubbles, a water flow channel for inputting cooling water is arranged inside the roller shaft. The surface of the plastic substrate is rapidly cooled and frozen by the cooling water, so that a hardened surface layer can be formed on the upper and lower surfaces of the plastic substrate. It is difficult for the internal air bubbles to break through the hardened surface layer, thereby maintaining the integrity and beauty of the substrate. Moreover, the substrate will be subjected to heating and other treatments subsequently, and the hardened surface layer is also convenient for the film laminating treatment of secondary temperature rise heating, without affecting the overall thickness of the board, achieving multiple benefits at one stroke.

[0040] In specific implementation, the coolant can be cold water, low-temperature water, etc., or other cooling liquids specifically used for absorbing temperature.

[0041] Refer to Figure 3 , which is a schematic side view of the roller shaft provided by the present invention.

[0042] In the embodiment of the present invention, a plurality of water flow channels 2 are arranged inside the roller shaft 1. The water flow channels are arc-shaped 2, and a plurality of arc-shaped water flow channels form a circular water flow channel 3.

[0043] In specific implementation, during the working process of the roller shaft group, the coolant in the water flow channel is in a circulating state. However, considering uniform cooling of the surface of the plastic substrate, a circular water flow channel is formed by a plurality of arc-shaped water flow channels. In this way, each arc-shaped water flow channel cools the corresponding area, avoiding the situation that due to the large cooling area of the water flow channel, after cooling a part of the area, the cooling capacity of the coolant decreases, and the cooling effect on other areas decreases, resulting in uneven cooling of the surface of the plastic substrate.

[0044] Refer to Figure 4 , which is a schematic front view of the roller shaft provided by the present invention.

[0045] In the embodiment of the present invention, a plurality of circular water flow channels 3 are arranged at intervals inside the roller shaft. The circular water flow channels of the upper roller shaft and the lower roller shaft are arranged staggeredly.

[0046] In specific implementation, the meaning of staggered arrangement specifically refers to that since the circular water flow channels are arranged at intervals, the cooling capacity of the interval part in the roller shaft is limited. Therefore, in the interval area of the upper roller shaft, a circular water flow channel is arranged corresponding to the lower roller shaft, and in the water flow channel area of the upper roller shaft, an interval area is arranged corresponding to the lower roller shaft. Thus, the ability to uniformly reduce the surface temperature of the plastic substrate can be further improved, and the effect of the hardened surface layer can be enhanced.

[0047] Refer to Figure 5 , which is a top view of the roller shaft shaping machine provided by the present invention.

[0048] In an embodiment of the present invention, the roll sizing machine includes a first roll group 4 and a second roll group 5. The length of the rolls in the first roll group 4 is shorter than the length of the plastic substrate. After passing through the first roll group 4, the plastic substrate enters the second roll group 5.

[0049] In an embodiment of the present invention, the roll sizing machine further includes a third roll group 6. The length of the rolls in the second roll group 5 is longer than the length of the first roll group 4 and shorter than the length of the plastic substrate. The length of the rolls in the third roll group 6 is not shorter than the length of the plastic substrate. After passing through the second roll group 5, the plastic substrate enters the third roll group 6.

[0050] In a specific implementation, three roll groups are provided. The first group is shorter, the second group is of medium length, and the third group is of the same length as or longer than the plastic substrate. The purpose is that, in order to overcome the problem of air bubbles, the first roll group 4 provided in the middle of the plastic substrate can squeeze the air bubbles in the middle of the plastic substrate to both sides thereof. The second roll group 5 can further squeeze the air bubbles to both sides. The third roll group 6 can squeeze the air bubbles out from both sides of the plastic substrate. On the other hand, multiple roll groups can perform multiple thickness calibrations, so that the obtained substrate has higher accuracy.

Claims

1. A co-extrusion production mechanism for plastic substrate floors, characterized in that, Including: A material production main machine, a co-extrusion die and a roller shaping machine, wherein: The material production main machine is used to plasticize plastic raw materials by heating to obtain plasticized materials, and input the plasticized materials into the co-extrusion die; The co-extrusion die has a plurality of independent flow channels corresponding to each plasticized material. The position sorting of the plasticized materials in the plastic substrate is consistent with the outlet position sorting of the independent flow channels. The outlets of the independent flow channels converge at the mixing flow channel. Various plasticized materials enter the mixing flow channel through the outlets of the independent flow channels to form a multi-layer plastic substrate. The plastic substrate enters the roller shaping machine through the mixing flow channel; an extrusion notch is provided at the inlet of the independent flow channel, and the height of the extrusion notch is less than the height of the corresponding independent flow channel; in the independent flow channel, the channel height between the area near the outlet and the outlet gradually decreases; The roller shaping machine includes a first roller group and a second roller group. The length of the rollers in the first roller group is shorter than the length of the plastic substrate, and the length of the second roller group is longer than that of the rollers in the first roller group. The plastic substrate enters the second roller group after passing through the first roller group; the midlines of the first roller group and the second roller group are consistent with the midline of the plastic substrate; Each roller group includes two rollers, namely an upper roller and a lower roller. The upper roller is arranged on the upper side of the plastic substrate, and the lower roller is arranged on the lower side of the plastic substrate. The roller group performs thickness fixing on the plastic substrate by rotational extrusion; a plurality of water flow channels are arranged inside the rollers in the roller group for inputting cooling liquid. The water flow channels are arc-shaped, and a plurality of arc-shaped water flow channels form a circular water flow channel. A plurality of circular water flow channels are arranged at intervals inside the roller. The circular water flow channels of the upper roller and the lower roller are arranged staggeredly.

2. The co-extrusion production mechanism for plastic substrate floors according to claim 1, characterized in that, The height of the outlet of the independent flow channel is greater than the thickness of the corresponding material layer in the plastic substrate.

3. The co-extrusion production mechanism for plastic substrate floors according to claim 2, wherein A weight detection unit is arranged at the outlet of the independent flow channel, which is used to detect the weight of the plasticized material with a standard length output by the independent flow channel, and issue a prompt when the weight is lower than the standard weight.

4. The co-extrusion production mechanism for plastic substrate floors according to claim 3, characterized in that, The roller shaping machine further includes a third roller group. The length of the rollers in the second roller group is longer than that of the rollers in the first roller group and shorter than the length of the plastic substrate. The length of the rollers in the third roller group is not shorter than the length of the plastic substrate. The plastic substrate enters the third roller group after passing through the second roller group; the midline of the third roller group is consistent with the midline of the plastic substrate.

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