Non-polyvinyl chloride wood-plastic plate deformation control device, production line and application

Abstract

The invention relates to the technical field of floor manufacturing, in particular to a non-polyvinyl chloride wood-plastic plate deformation control device, a production line and application. The traction roller assembly is formed by combining a plurality of traction rollers and is used for performing traction shaping on the semi-finished plates; the die comprises an output port used for outputting the semi-finished plates, and an included angle exists between the output port and the horizontal plane, so that the direction of the semi-finished plates pulled by the traction roller assembly along the output port does not coincide with the direction of gravity borne by the semi-finished plates, and the included angle between the semi-finished plates is smaller than 90 degrees. According to the deformation control device, by changing the angle relation between the output port of the mold and the horizontal plane, the problems that shrinkage and warping do not occur in the extrusion process of a traditional plate with polyvinyl chloride as a raw material are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of floor manufacturing, and in particular to a non-polyvinyl chloride wood-plastic board deformation control device, a production line and applications. Background Art

[0002] Flooring with three-dimensional wood grain has become a popular choice in the field of panel manufacturing. These floors are able to create products that look and feel similar to natural wood by using advanced technology and materials. These three-dimensional wood grain floors have better performance and durability, which can meet consumer demand for high-quality, low-maintenance and low-cost products. In addition, the manufacturing process of these products can reduce dependence on natural resources, thereby protecting the environment and promoting sustainable development.

[0003] At present, three-dimensional wood grain floors usually use a board containing polyvinyl chloride (PVC) as a substrate, and the three-dimensional wood grain is formed on the substrate by printing or stacking. Since polyvinyl chloride artificial board has the characteristics of wear resistance, waterproofness, and corrosion resistance, it has certain advantages in the production of three-dimensional wood grain floors.

[0004] For example, the patent with authorization announcement number CN112095967B discloses a multi-level synchronously-aligned molded round-edge PVC panel, which includes a panel body. The panel body includes, from top to bottom, a UV paint layer, a PVC wear-resistant layer, a PVC patterned film layer, a PVC substrate board, and a PVC base material layer. The surface of the panel contains a synchronously-aligned simulated three-dimensional texture. The panel body has arc edges and a locking structure around it, and the panels can be locked and spliced ​​with each other through the locking structure.

[0005] Patent publication number CN114953665A discloses a preparation process of PVC floor and the resulting product. The specific preparation steps include: stacking a PVC substrate layer, a PVC printing layer, and a PVC pre-coating film in sequence, and performing a one-time lamination process to obtain a finished PVC floor.

[0006] However, the use of PVC artificial boards has some insurmountable drawbacks in terms of recycling and environmental protection. First, due to the structural characteristics of PVC, its recycling and reuse are relatively difficult, resulting in waste of resources. Secondly, PVC releases harmful substances during production, use and treatment, posing potential risks to the environment and human health. Therefore, for environmental reasons, it is necessary to impose certain restrictions on the use of PVC in the flooring industry.

[0007] In order to solve the defects of PVC artificial boards, researchers began to explore alternative materials. Among them, polyolefin materials are considered to be a potential alternative. As a typical representative of polyolefin materials, polypropylene is a non-PVC material with good physical properties and chemical stability. It can be used to prepare artificial boards and can simulate the texture and feel similar to natural wood. In addition, polypropylene materials are also recyclable and reusable, which helps reduce resource waste and environmental pollution.

[0008] For example, the patent with application publication number CN 108659333 A provides a non-polyvinyl chloride surface covering, comprising: a base material layer; an intermediate layer, which is located on the base material layer, wherein the intermediate layer includes a middle material layer; and a transparent wear-resistant layer, which is located on the intermediate layer, wherein the transparent wear-resistant layer comprises: 40 to 94.95 weight percent of polyolefin, 5 to 50 weight percent of polyolefin elastomer or polyolefin plastomer, and 0.05 to 10 weight percent of processing aid.

[0009] For another example, a patent with application publication number CN 111267448 A discloses a NON-PVC substrate 3D printed floor, comprising a NON-PVC substrate layer, a balancing layer and a solid wood layer are sequentially arranged on the NON-PVC substrate layer, a UV primer layer is arranged on the surface of the solid wood layer, a white UV paint layer is arranged on the UV primer layer, a printing pattern layer is arranged on the surface of the white UV paint layer, and a concave-convex effect layer is arranged on the surface of the printing pattern layer.

[0010] However, polyolefin materials (such as polypropylene) have high thermal shrinkage, which means that when the temperature changes during the manufacturing process, polypropylene will shrink. This thermal shrinkage may cause the board to shrink unevenly during the cooling process, thereby causing warping, and ultimately leading to uneven and unstable floors. In addition, the wear resistance of polyolefin materials is also somewhat different from that of polyvinyl chloride. Therefore, in order to overcome these problems, it is necessary to improve the preparation method and production device of boards using polyolefin materials as raw materials, so as to help improve the quality, stability and environmental friendliness of floors with three-dimensional wood grain. Summary of the invention

[0011] The present invention aims to overcome the defects of non-polyvinyl chloride wood-plastic board in the prior art, such as high warping rate during the molding process, resulting in unevenness and instability of the final floor. Therefore, a non-polyvinyl chloride wood-plastic board deformation control device, production line and application are provided to overcome the above-mentioned shortcomings.

[0012] To achieve the above-mentioned purpose, the present invention is implemented by the following technical solutions: In a first aspect, the present invention first provides a non-polyvinyl chloride wood-plastic board deformation control device, It comprises a mould fixedly connected to an extruder for outputting a semi-finished plate, and a traction roller assembly composed of a plurality of traction rollers and used for traction and shaping the semi-finished plate; the mould comprises an output port for outputting the semi-finished plate, and there is an angle between the output port and a horizontal plane, so that the direction in which the semi-finished plate is pulled by the traction roller assembly along the output port does not coincide with the direction of the gravity exerted on the semi-finished plate itself, and the angle between the two is less than 90 degrees.

[0013] In the prior art, the sheet substrate (such as SPC substrate, LVT substrate) using polyvinyl chloride as raw material usually uses polyvinyl chloride as the polymer substrate during the preparation process, and stone powder is added thereto, and finally the desired sheet is obtained by extrusion. Since polyvinyl chloride is an amorphous polymer, its volume shrinkage before and after extrusion is relatively low, so that the traditional polyvinyl chloride substrate does not need to consider too much about the warping caused by its volume shrinkage during the preparation process. At the same time, due to the strong polarity of polyvinyl chloride, the viscosity of the melt obtained after it is mixed and melted with stone powder is relatively large, and the hardness of the semi-finished sheet obtained after the melt flows out of the mold and cools is relatively high, so that even under the action of external force, its shape-keeping ability is still relatively strong, so it is difficult to warp and deform under the action of external force and internal stress.

[0014] In view of the above reasons, during the extrusion process of the sheet substrate made of polyvinyl chloride as raw material, the material usually enters the extruder, is melted and plasticized, and then is output through a horizontally arranged mold to form a semi-finished sheet. The semi-finished sheet is then pulled horizontally and enters the cooling mechanism for cooling and shaping. However, with the continuous improvement of environmental protection requirements, the upgrading and replacement of polyvinyl chloride materials is imminent. However, the applicant discovered an unexpected technical problem in the process of extruding a new type of polyolefin material sheet using traditional extrusion equipment, that is, the polyolefin semi-finished sheet prepared by traditional extrusion equipment has a large volume shrinkage rate and severe warping deformation, which makes it difficult to use it to prepare non-polyvinyl chloride wood-plastic sheets and non-polyvinyl chloride wood-plastic floors.

[0015] In this regard, the applicant has conducted an in-depth study on the above phenomenon and found that the reasons for the serious warping and deformation of non-PVC wood-plastic panels include at least the following: (1) Since the molecular chain segments of polyolefin materials are more regular, their crystallization performance is significantly higher than that of traditional polyvinyl chloride, which causes their volume to shrink during the crystallization process. (2) At the same time, since the viscosity of the polyolefin melt extruded from the mold is lower, it is easily deformed by external forces (traction and gravity). (3) Due to the influence of traction and gravity, the degree of crystallization of the polyolefin material at different positions is uneven, further aggravating the formation of warping. For the above reasons for the warping, the applicant proposes that improvements can be made from several angles, such as raw material formula, preparation and molding process, and molding equipment.

[0016] Among them, the present application is to modify the traditional PVC wood-plastic board forming equipment to adapt to the production of new non-PVC wood-plastic boards, thereby solving or alleviating the serious warping and deformation problem of non-PVC wood-plastic boards caused by the equipment.

[0017] The applicant discovered in the course of daily experiments that the extrusion equipment has an important influence on the crystallization behavior of polyolefin non-PVC wood-plastic boards. On this basis, the applicant unexpectedly discovered that after the raw materials were melted and plasticized by the extruder, when they were extruded from the mold, the melt was affected by gravity, causing the middle of the semi-finished board to sag, and the semi-finished board was subjected to a horizontal traction force during the transportation process. The superposition of the two forces in different directions will cause inconsistent changes in the crystallization behavior at the center and edge of the semi-finished board, resulting in different crystallinity and crystal size at the center and edge of the semi-finished board, and ultimately causing warping in its width direction.

[0018] In view of this phenomenon, the present application creatively changes the angle between the die outlet and the horizontal plane, thereby changing the angle between the direction in which the semi-finished plate is pulled by the pulling roller assembly along the outlet and the direction of the gravity on which the semi-finished plate is subjected to to be less than 90 degrees. Through the above arrangement, the resultant force between the pulling force of the pulling roller assembly and the gravity of the semi-finished plate in the thickness direction is weakened and is more evenly distributed in the width direction of the semi-finished plate, thereby reducing the warping of the semi-finished plate in the width direction.

[0019] In addition, through the above-mentioned settings, the resultant force of the semi-finished plate along its length direction is also improved, so that the macromolecules or microcrystals and other structures inside the semi-finished plate are significantly oriented along its length direction, further accelerating the induction effect of external force on the semi-finished plate along its length direction, and ultimately improving the crystallization rate and crystallinity of the semi-finished plate, thereby preventing shrinkage and warping caused by changes in its crystal form during subsequent cooling and storage processes.

[0020] Furthermore, since the macromolecules or microcrystals inside the semi-finished board are oriented under the induction of external force, their crystal structures are always evenly arranged along the length direction of the semi-finished board, so the mechanical strength, hardness and wear resistance of the semi-finished board can be greatly improved.

[0021] However, the direction in which the semi-finished plate is pulled by the traction roller assembly along the output port and the direction of the gravity on the semi-finished plate itself are not necessarily the smaller the better. For example, in the extreme case where the two overlap, the resultant force on the semi-finished plate along its length direction is greatly increased, resulting in uneven thickness of the semi-finished plate, and specific surface manifestations include flow lines and wave lines.

[0022] Therefore, in summary, the present application changes the angle between the output port of the mold and the horizontal plane, thereby changing the angle between the direction in which the semi-finished sheet is pulled by the pulling roller assembly along the output port and the direction of the gravity on which the semi-finished sheet is subjected, thereby effectively overcoming the shrinkage and warping problems that do not occur in the extrusion process of the conventional sheet substrate made of polyvinyl chloride. At the same time, the mechanical strength, hardness and wear resistance of the sheet are unexpectedly additionally improved.

[0023] Preferably, the traction roller assembly comprises at least an input traction roller pair for traction of the semi-finished plate in an inclined direction of the output port, and an output traction roller pair for transporting the semi-finished plate in a horizontal direction.

[0024] The traction roller assembly in the present application includes multiple traction roller pairs, so the semi-finished plate can be extruded and shaped multiple times during the traction process, thereby micro-regulating the crystallization state inside the semi-finished plate, thereby ensuring that the crystal size structure inside the semi-finished plate can be maintained in a roughly the same state, thereby preventing problems such as warping caused by different crystallization conditions of different parts of the silver.

[0025] Preferably, the angle between a perpendicular line of a center connecting line of two traction rollers in the input traction roller pair and a horizontal plane is greater than the angle between the output port and the horizontal plane.

[0026] In the present application, the above-mentioned definition enables the traction rollers of the input traction roller pair to be closer to perpendicular to the horizontal plane, so that a greater traction force can be applied. This helps to pull the semi-finished sheet more effectively and provide a stronger pulling force, making the sheet more stable during transportation. At the same time, the inclined input traction roller pair can pull the semi-finished sheet obliquely along the direction of the output port. This traction method can improve the transmission of the sheet, allowing it to pass through the device more smoothly and reduce possible jamming or blockage. And because the traction force applied by the input traction roller pair is large, it can effectively resist the gravity exerted on the semi-finished sheet. This can reduce the risk of deformation of the sheet during transportation and keep the shape of the sheet stable. Finally, the inclined input traction roller pair can better control the movement trajectory and speed of the semi-finished sheet. This can improve the operating efficiency of the production line and ensure that the semi-finished sheet is transmitted and processed in the expected manner.

[0027] Preferably, the center connecting line of the input traction roller pair intersects with the center connecting line of the output traction roller pair and is not perpendicular.

[0028] In the present application, the center connecting line of the input traction roller pair and the center connecting line of the output traction roller pair are intersected and not perpendicular, which can produce the following benefits: (1) The crossed and non-perpendicular center connecting lines can guide the semi-finished plate to change direction during the traction process. This can improve the transmission path of the plate, allowing it to pass through the device more smoothly and reduce possible jamming or blockage. (2) The crossed center connecting lines can help to evenly apply the traction force so that it is evenly distributed over the entire surface of the plate. This helps to reduce the risk of deformation of the plate and ensure that the plate remains stable during transportation. (3) Because the center connecting lines intersect and are not perpendicular, the input traction roller pair and the output traction roller pair can work better together to provide stronger tension and traction. This can improve the traction effect and better control the semi-finished plate. (4) The crossed and non-perpendicular center connecting line design can provide more operational flexibility. The operator can adjust the angle between the input traction roller pair and the output traction roller pair as needed to meet the requirements of different plates.

[0029] Preferably, the input traction roller pair comprises a pair of traction rollers distributed in the vertical direction; wherein the height of the output port of the mold is greater than the height of the traction roller located below the input traction roller pair.

[0030] By setting the height of the output port to be greater than the height of the traction rollers located below the input traction roller pair, it is possible to ensure that the semi-finished sheet can pass smoothly when passing through the traction rollers. This can prevent the semi-finished sheet from being stuck or blocked by the traction rollers during the transmission process, ensure the smooth transmission of the sheet, reduce the possibility of jamming or stopping production, thereby improving the production capacity and efficiency of the production line, and prevent the semi-finished sheet from being damaged or deformed during the transmission process, which can reduce the frequency of maintenance and replacement of the traction rollers. This can reduce maintenance costs and extend the service life of the traction rollers. At the same time, it can prevent the semi-finished sheet from being excessively compressed and deformed when passing through the traction rollers. This helps to maintain the shape and structure of the sheet intact and reduce the risk of possible damage.

[0031] Preferably, the semi-finished plate output from the output port is pulled and transported along a tangent direction to the input pulling roller.

[0032] The semi-finished sheet can be pulled and transported in the tangential direction of the input traction roller to achieve smooth movement. This traction method can reduce the shaking and bumping of the sheet during transportation, ensure the stable transmission of the sheet, and the sheet can pass through the device at a higher speed and in a more stable manner, thereby improving the production line's capacity and efficiency. And by pulling and transporting the semi-finished sheet in the tangential direction, the position and positioning of the sheet can be better controlled. This helps to improve the processing accuracy and positioning accuracy of the sheet, ensuring that the quality and size of the final product meet the requirements. In addition, this traction method can evenly apply traction force, and can also reduce the risk of bending and deformation of the sheet during transportation, avoid local deformation of the sheet, and thus maintain the flatness and shape stability of the sheet.

[0033] Preferably, the angle between the output port and the horizontal plane is 30-60°.

[0034] Preferably, the temperature of the traction roller assembly is lower than the temperature of the output port; and The temperatures of the traction rollers in the traction roller assembly are increased sequentially along the conveying direction of the semi-finished plate.

[0035] The present application can control the crystallization behavior of polymers during the transportation of semi-finished sheets by setting a temperature gradient. During the process of the material melt being discharged along the output port of the mold, the temperature of the surface of the semi-finished sheet will drop rapidly, while the middle part will still maintain a relatively high temperature. Therefore, due to the large temperature difference between the inside and outside of the semi-finished sheet, the crystallinity inside and outside the semi-finished sheet will change significantly, which is specifically manifested in that the particle size of the polymer crystals on the surface of the semi-finished sheet is smaller, while the polymer crystals inside the semi-finished sheet are relatively larger. At the same time, due to the sudden drop in temperature on the surface of the semi-finished sheet, a part of the polymer chain segments will be fixed by cold before they have time to crystallize, resulting in changes in the crystallinity of the polymers inside and outside the semi-finished sheet, which further affects the stability of the semi-finished sheet.

[0036] In view of the above problems, the temperature of the traction roller assembly is set in the present application to affect the crystallization process of the polymer. The applicant has found that by gradually increasing the temperature of the traction roller assembly, the degree of crystallization inside and outside the semi-finished sheet can be increased, the crystallinity of the polymer can be improved, and the precise control of the polymer crystallization process can be achieved to ensure uniform crystallization during the conveying process, thereby improving the quality and consistency of the product and reducing the non-uniformity of the material. This helps to improve the strength and rigidity of the semi-finished sheet, making it more suitable for specific application requirements. In addition, by gradually increasing the temperature of the traction roller in the traction roller assembly, the semi-finished sheet can be annealed, thereby reducing the residual stress in the semi-finished sheet. The principle is that the change in temperature can cause the polymer molecules to rearrange, reduce the residual stress in the sheet, and improve the stability and durability of the sheet.

[0037] In summary, setting the temperature of the pulling roller assembly lower than the temperature of the output port and gradually increasing the temperature of the pulling roller along the conveying direction of the semi-finished sheet can improve the strength of the semi-finished sheet, reduce residual stress, and improve the quality and consistency of the product by controlling the crystallization behavior of the polymer.

[0038] Preferably, the temperature difference between the traction roller for inputting the semi-finished plate and the temperature of the output port in the traction roller assembly is 10-15°C; The difference between the temperature of the traction roller used for outputting the semi-finished plate in the traction roller assembly and the temperature of the output port is ≤10°C.

[0039] In the present application, the temperature of the traction roller of the traction roller assembly is relatively close to the temperature of the semi-finished plate output from the output port, which can effectively avoid the uneven crystallization phenomenon caused by the rapid cooling of the semi-finished plate, thereby further improving the stability of the semi-finished plate and reducing its warping rate.

[0040] Preferably, the traction roller comprises a traction roller body and a first temperature-controlled jacket covering the outside of the traction roller body; The first temperature-controlling jacket is filled with a temperature-controlling liquid which can control the surface temperature of the first temperature-controlling jacket.

[0041] The present application designs a traction roller to include a traction roller body and an external first temperature-controlled jacket, and fills the traction roller with a temperature-controlled liquid that can control the surface temperature of the jacket. The traction roller temperature can be precisely controlled and optimized through temperature control, temperature uniformity, heat regulation, and adhesion prevention.

[0042] Preferably, the mold is provided with a temperature control device located outside the output port for controlling the temperature of the semi-finished plate output from the output port.

[0043] Preferably, the temperature control device comprises a second temperature control jacket, and the interior of the second temperature control jacket is filled with temperature control liquid.

[0044] Preferably, the deformation control device further comprises a bearing seat for bearing the traction roller assembly; The bearing seat is also provided with a driving device for driving the traction roller in the traction roller assembly to move.

[0045] The presence of the bearing seat can provide the support and stability required by the traction roller assembly. It can bear the weight of the entire traction roller assembly and ensure that it remains balanced and stable during operation. At the same time, through the drive device, the movement of the traction roller can be accurately controlled. This can achieve accurate traction and positioning of the semi-finished sheet, thereby ensuring the accuracy of the size and shape of the product.

[0046] Preferably, a shaping template for shaping the semi-finished plate is also provided on the bearing seat behind the traction roller assembly.

[0047] The shaping template can provide accurate shaping shapes and sizes. By contacting the semi-finished sheet with the shaping template and applying appropriate pressure and heat source, it can ensure that the semi-finished sheet forms the required shape and size according to the design requirements during the shaping process, thereby improving the shaping accuracy of the product. At the same time, by using the shaping template, the shaping deviation caused by inconsistent manual operation can be reduced, the consistency and stability of the product can be improved, and the production efficiency can be improved.

[0048] Preferably, the deformation control device also includes a mold hanger for hoisting and fixing the mold.

[0049] The mold hanger can provide a safe and reliable method for hoisting and fixing the mold. It can ensure the stability of the mold during hoisting and transportation, avoid accidental shaking or falling, and protect the safety of equipment and operators. At the same time, it can also simplify the hoisting and fixing process of the mold and improve the hoisting efficiency and accuracy.

[0050] In a second aspect, the present invention further provides a non-polyvinyl chloride wood-plastic board extrusion production line, which comprises the non-polyvinyl chloride wood-plastic board deformation control device as described in any one of the above.

[0051] Preferably, the non-PVC wood-plastic board extrusion production line is provided with an extruder, a deformation control device, a cooling mechanism, a traction mechanism and a cutting mechanism in sequence along the material transmission direction.

[0052] In the present application, the extruder is the starting part of the production line, which is used to heat, melt and extrude the non-PVC wood-plastic composite material into a plate shape. The deformation control device is located after the extruder, which is used to control the deformation of the extruded plate, thereby reducing the problem of warping after extrusion. The cooling mechanism is used to quickly cool and solidify the extruded plate to keep it in the desired shape and size. The traction mechanism is located after the cooling mechanism, which is used to traction and stretch the cooled plate to increase its strength and stability. The cutting mechanism is located after the traction mechanism, which is used to cut the cooled and traction plate into the desired length to obtain the final non-PVC wood-plastic plate product.

[0053] Through the above production line configuration, the extrusion production of non-PVC wood-plastic boards can be realized, wherein the function of the deformation control device is to control the deformation of the extruded board to obtain the desired shape and size.

[0054] Preferably, the cooling device comprises several groups of powered cooling rollers and several groups of driven cooling rollers.

[0055] The cooling device with powered cooling roller and driven cooling roller can improve production efficiency. Through rapid cooling and deformation control, the cooling speed of extruded sheet can be accelerated and the production cycle can be shortened. At the same time, through uniform cooling and shape control, the defective rate of sheet caused by uneven temperature or shape deformation can be reduced, and product quality and production capacity can be improved.

[0056] Preferably, the cooling device also includes a cooling bracket arranged behind the powered cooling roller and the driven cooling roller.

[0057] Preferably, the bottom of the deformation control device and the cooling mechanism is provided with a slide rail arranged along the extension direction of the extruder; The bottom of the deformation control device and the cooling mechanism is also provided with a pulley which can drive the deformation control device and the cooling mechanism to move along the slide rail to control the distance between the deformation control device and the cooling mechanism and the mold.

[0058] Through the design of the slide rail and pulley, the deformation control device and the cooling mechanism can be flexibly adjusted. The operator can control the distance between the deformation control device and the cooling mechanism and the mold by adjusting the pulley position to adapt to molds of different sizes and shapes. At the same time, by adjusting the pulley position, the gap between the deformation control device and the cooling mechanism and the mold can be fine-tuned to achieve the desired deformation effect and cooling effect. In addition, the design of the slide rail and pulley makes the adjustment and maintenance of the deformation control device and the cooling mechanism more convenient. The operator can easily move the deformation control device and the cooling mechanism for cleaning, maintenance or replacement of parts. This can reduce downtime and improve the stability and reliability of the production line. Finally, by quickly adjusting the distance between the deformation control device and the cooling mechanism and the mold, the mold change and adjustment time can be shortened, the downtime of the production line can be reduced, and the production efficiency and capacity can be improved.

[0059] In a third aspect, the present invention also provides the use of the non-PVC wood-plastic board deformation control device as described above or a non-PVC wood-plastic board extrusion production line comprising the deformation control device in the preparation of non-PVC wood-plastic boards or non-PVC floors.

[0060] The present invention has the following beneficial effects: - The non-PVC wood-plastic board deformation control device in the present application changes the angle between the output port of the mold and the horizontal plane, thereby changing the angle between the direction in which the semi-finished board is pulled by the pulling roller assembly along the output port and the direction of the gravity exerted on the semi-finished board itself, effectively overcoming the shrinkage and warping problems that do not occur in the traditional board substrate made of PVC as raw material during the extrusion process; - At the same time, the above arrangement also unexpectedly improves the mechanical strength, hardness and wear resistance of the plate; - In the present application, by adding the non-polyvinyl chloride wood-plastic board deformation control device to the non-polyvinyl chloride wood-plastic board extrusion production line, the floor failure caused by the warping of the board is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a structural schematic diagram of the non-polyvinyl chloride wood-plastic board extrusion production line described in the present invention.

[0062] Figure 2 For the present invention Figure 1 Enlarged view of point a in the middle.

[0063] Figure 3 It is a schematic diagram of the hoisting structure of the mold of the present invention.

[0064] Figure 4 It is a schematic structural diagram of the traction roller assembly of the present invention.

[0065] Figure 5 It is a schematic diagram of the cross-sectional structure of the traction roller of the present invention.

[0066] Figure 6 It is a schematic diagram of the cross-sectional structure of the mold of the present invention.

[0067] Figure 7 It is a structural schematic diagram of the mold temperature controller in the cooling mechanism of the present invention.

[0068] Wherein: extruder 100, barrel 101, feeding mechanism 102, semi-finished plate 200, mold 300, output port 301, temperature control device 302, second temperature control jacket 303, mold hanger 304, traction roller assembly 400, traction roller 401, No. 1 traction roller 401-1, No. 2 traction roller 401-2, No. 3 traction roller 401-3, input traction roller pair 402, output traction roller pair 403, traction roller body 404, first temperature control jacket 405, bearing seat 406, driving device 407, shaping template 408, cooling mechanism 500, mold temperature controller 501, powered cooling roller 502, driven cooling roller 503, cooling bracket 504, slide rail 505, pulley 506, traction mechanism 600, cutting mechanism 700. DETAILED DESCRIPTION

[0069] The present invention is further described below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0070] like Figure 1 As shown, this embodiment 1 provides a non-PVC wood-plastic board extrusion production line, the material transmission direction (i.e. along Figure 1 From left to right), the extrusion production line includes, in sequence, an extruder 100 for melting and plasticizing a non-polyvinyl chloride material and extruding the plasticized melt, a mold 300 for outputting the plasticized melt to form a semi-finished board 200, a traction roller assembly 400 for traction of the semi-finished board 200 and controlling its deformation rate, a cooling mechanism 500 for cooling and shaping the semi-finished board 200 after deformation control, a traction mechanism 600 for traction of the semi-finished board 200, and a cutting mechanism 700 for cutting the semi-finished board 200 to obtain a finished non-polyvinyl chloride wood-plastic board.

[0071] Wherein: the extruder 100 is a single screw extruder or a twin screw extruder, which includes a barrel 101 and a feeding mechanism 102 for feeding materials into the barrel 101. Taking the production of polypropylene wood plastic board as an example, firstly, the polypropylene wood plastic board raw material is put into the feeding mechanism 102, and these polypropylene wood plastic board raw materials are heated by the barrel 101 and plasticized by the internal screw, so as to melt and form a melt. Usually, the polypropylene wood plastic board raw material includes polypropylene resin and wood powder, and in some cases also includes a certain amount of plasticizer and lubricant. After mixing these raw materials, they are crushed by extrusion granulation equipment or mixer to obtain the polypropylene wood plastic board raw material we need.

[0072] like Figure 2 as well as Figure 3 As shown, the mold 300 is connected to the end of the barrel 101, and includes an outlet 301. The melt flowing out of the barrel 101 is extruded and shaped through the outlet 301 to obtain a semi-finished plate 200. Different from the plate substrates made of polyvinyl chloride as raw materials in the prior art, such as SPC substrates and LVT substrates, there is a certain angle between the mold 300 in the present application and the horizontal plane, so that the semi-finished plate 200 output from the mold 300 is output in a non-horizontal direction, thereby reducing the increase in the warpage of the semi-finished plate 200 due to gravity.

[0073] Since the mold 300 has a large mass, in some preferred embodiments, in order to improve the connection stability between the mold 300 and the barrel 101, a mold hanger 304 is added to hang and fix the mold 300, thereby providing a safe and reliable hanging and fixing method for the mold 300. It can ensure the stability of the mold 300 during the hanging and transportation process, avoid accidental shaking or falling, and protect the safety of the equipment and operators. At the same time, it can also simplify the hanging and fixing process of the mold, and improve the hanging efficiency and accuracy.

[0074] like Figure 2 as well as Figure 4 As shown, in this embodiment, a group of traction roller assemblies 400 for traction and shaping the semi-finished plate 200 are also provided behind the mold 300 to match the mold 300. The traction roller assembly 400 is composed of a plurality of traction rollers 401. Figure 2As shown in , the number of the pulling rollers 401 in this embodiment is 3, and the three pulling rollers 401 can be divided into a No. 1 pulling roller 401-1, a No. 2 pulling roller 401-2, and a No. 3 pulling roller 401-3 along the conveying direction of the semi-finished plate. According to the position and function classification of the pulling rollers 401, the pulling rollers 401 in the pulling roller assembly 400 can be at least divided into an input pulling roller pair 402 composed of the No. 1 pulling roller 401-1 and the No. 2 pulling roller 401-2, which is used to pull the semi-finished plate 200 along the inclined direction of the output port 301, and an output pulling roller pair 403 composed of the No. 2 pulling roller 401-2 and the No. 3 pulling roller 401-3, which is used to change the conveying direction of the semi-finished plate 200 so that it is conveyed in a horizontal direction.

[0075] In some preferred embodiments, the center connecting line of the No. 1 traction roller 401-1 and the No. 2 traction roller 401-2 in the input traction roller pair 402 intersects and is not perpendicular to the center connecting line of the No. 2 traction roller 401-2 and the No. 3 traction roller 401-3 in the output traction roller pair 403, so that the No. 2 traction roller 401-2 and the No. 3 traction roller 401-3 are flat in the horizontal direction, while the No. 1 traction roller 401-1 and the No. 2 traction roller 401-2 are obliquely distributed in the vertical direction, wherein the No. 1 traction roller 401-1 is closer to the output port 301 of the mold 300 than the No. 2 traction roller 401-2, and in addition, the height of the output port 301 of the mold 300 is greater than the height of the No. 1 traction roller 401-1 and less than the height of the No. 2 traction roller 401-2, so that the semi-finished plate output from the output port 301 is pulled and transported in a direction 200 that is tangent to both the No. 1 traction roller 401-1 and the No. 2 traction roller 401-2.

[0076] In some preferred embodiments, the angle between the perpendicular line of the center connection line of traction roller No. 1 401-1 and traction roller No. 2 401-2 in the input traction roller pair 402 and the horizontal plane is greater than the angle between the output port 301 and the horizontal plane. Such a setting can further reduce the warping of the prepared semi-finished plate 200.

[0077] In order to explore the relationship between the angle between the output port 301 and the horizontal plane and the warping degree of the semi-finished plate 200 finally obtained, in this embodiment, the semi-finished plate 200 prepared with different output port 301 angles and the pulling roller assembly 400 adapted to the different output port 301 angles were tested, and the test results are shown in Table 1 below.

[0078] Table 1

[0079] It can be seen from the above test results that with the change of the angle of the outlet 301, the influence of gravity on the warpage of the semi-finished sheet 200 can be effectively reduced. When the outlet 301 is level with the horizontal plane (i.e., the angle is 0°), the warpage of the semi-finished sheet is the largest, reaching 0.62mm / m. As the angle between the outlet 301 and the horizontal plane increases, the warpage gradually decreases. When the angle between the outlet 301 and the horizontal plane is ≥30°, the warpage of the semi-finished sheet 200 can reach a level of less than 0.3mm / m. However, the larger the angle between the outlet 301 and the horizontal plane, the better. When the angle between the outlet 301 and the horizontal plane is 80°, the surface of the semi-finished sheet 200 has flow lines, and when the outlet 301 is perpendicular to the horizontal plane (i.e., the angle is 90°), there are obvious flow lines. Therefore, considering the warping and flow pattern of the semi-finished plate 200, when the angle between the output port 301 and the horizontal plane is 30-60°, the prepared semi-finished plate 200 has the best performance.

[0080] In addition to the angle between the outlet 301 and the horizontal plane regulating the warping of the semi-finished sheet 200, the applicant also found that the temperature of each traction roller 401 in the traction roller assembly has an auxiliary effect on the deformation control of the semi-finished sheet 200. The applicant found that when the semi-finished sheet 200 is output along the outlet 301, the temperature of its surface will drop rapidly, while the middle part still maintains a higher temperature. Therefore, due to the large temperature difference between the inside and outside of the semi-finished sheet 200, the crystallization properties inside and outside the semi-finished sheet 200 will change significantly, which is specifically manifested in that the particle size of the polymer crystals on the surface of the semi-finished sheet 200 is smaller, while the polymer crystals inside the semi-finished sheet are relatively larger. In addition, due to the sudden drop in temperature on the surface of the semi-finished sheet 200, a part of the polymer chain segments will be fixed by cold before they have time to crystallize, thereby causing the crystallinity of the polymer inside and outside the semi-finished sheet 200 to change, which further affects the stability of the semi-finished sheet 200.

[0081] In this embodiment, the temperature of the traction roller assembly 400 is set to change the crystallization process of the polymer, thereby reducing the warping and deformation of the semi-finished sheet 200 after extrusion. The specific settings are as follows: First, the overall temperature of the traction roller assembly 400 is lower than the temperature of the output port 301, so that the crystallization of the polymer inside the semi-finished sheet 200 can be promoted, and at the same time, the temperature of the traction roller 401 in the traction roller assembly 400 is gradually increased along the conveying direction of the semi-finished sheet 200. By gradually increasing the temperature of the traction roller assembly 400, the degree of crystallization inside and outside the original semi-finished sheet 200 can be increased, the crystallinity of the polymer can be improved, and the precise control of the polymer crystallization process can be achieved to ensure uniform crystallization during the conveying process, thereby improving the quality and consistency of the product and reducing the non-uniformity of the material. This helps to improve the strength and rigidity of the semi-finished sheet 200, making it more suitable for specific application requirements. In addition, by gradually increasing the temperature of the traction roller 401 in the traction roller assembly 400, the semi-finished sheet 200 can be annealed, thereby reducing the residual stress in the semi-finished sheet 200. The principle is that changes in temperature can cause polymer molecules to rearrange, reduce residual stress in the board, and improve the stability and durability of the board.

[0082] In some preferred conditions of this embodiment, the difference between the temperature of the traction roller 401 in the traction roller assembly 400 for inputting the semi-finished plate 200 and the temperature of the output port 301 can be 10-15°C, and the difference between the temperature of the traction roller 401 in the traction roller assembly 400 for outputting the semi-finished plate 200 and the temperature of the output port 301 is ≤10°C. Such a setting can make the temperature of the traction roller 401 of the traction roller assembly 400 close to the temperature of the semi-finished plate 200 output from the output port 301, which can effectively avoid the phenomenon of uneven crystallization caused by rapid cooling of the semi-finished plate 200, thereby further improving the stability of the semi-finished plate 200 and reducing its warpage.

[0083] In order to explore the relationship between the temperature of the pulling roller assembly 400 and the warpage of the semi-finished plate 200 finally obtained, the semi-finished plate 200 prepared at different temperatures of the pulling roller assembly 400 in this embodiment was tested, and the test results are shown in Table 2 below.

[0084] Table 2

[0085] It can be seen from the above test results that as the temperature of each traction roller 401 in the traction roller assembly 400 changes, the warping degree of the final semi-finished plate 200 will also be adjusted accordingly.

[0086] In order to precisely control the temperature of the pulling roller 401 and the output port 300 in the pulling roller assembly 400 , the present application specifically designs the pulling roller 401 and the mold 300 .

[0087] In some preferred embodiments, Figure 5 As shown, the traction roller 401 includes a traction roller body 404 and a first temperature control jacket 405 covering the outside of the traction roller body 404 , and the area between the first temperature control jacket 405 and the traction roller body 404 is filled with a temperature control liquid that can control the surface temperature of the first temperature control jacket 405 .

[0088] like Figure 6 As shown, the mold 300 is provided with a temperature control device 302 located outside the output port 301 for controlling the temperature of the semi-finished plate 200 output from the output port 301, and the temperature control device 302 includes a second temperature control jacket 303, and the second temperature control jacket 303 is filled with a temperature control liquid.

[0089] Continue as Figure 1 as well as Figure 2 As shown, in order to improve the support and stability required by the traction roller assembly 400, the present embodiment further includes a bearing seat 406 for bearing the traction roller assembly 400, and the bearing seat 406 is also provided with a driving device 407 for driving the traction roller 401 in the traction roller assembly 400 to move. The driving device 407 can be a motor or other device for providing rotational power to the traction roller 401. Each traction roller 401 can be provided with a corresponding driving device 407, or a plurality of traction rollers 401 can be provided with a corresponding driving device 407, and the linkage of the plurality of traction rollers 401 can be achieved through a transmission device (such as a transmission belt or a transmission chain).

[0090] In addition, in order to further improve the stability of the semi-finished plate 200, this embodiment further provides a shaping template 408 for shaping the semi-finished plate 200 on the bearing seat 406 and behind the traction roller assembly 400. The shaping template 408 contacts the semi-finished plate 200 and can apply a certain pressure and heat source, thereby exerting a certain hot pressing effect on the semi-finished plate, thereby ensuring that the semi-finished plate is formed into the required shape and size according to the design requirements during the shaping process, thereby improving the shaping accuracy of the product.

[0091] The cooling mechanism 500 includes a mold temperature controller 501 with a roller, and its structural schematic diagram is shown in FIG. Figure 7As shown, the mold temperature controller 501 includes several groups of powered cooling rollers 502 and several groups of driven cooling rollers 503. When the semi-finished sheet 200 comes out of the shaping template 408, it is transported forward along the powered cooling rollers 502 and the driven cooling rollers 503 in sequence, so that the powered cooling rollers 502 and the driven cooling rollers 503 come into contact with the semi-finished sheet 200, thereby quickly cooling down and shaping it.

[0092] like Figure 1 As shown, after the semi-finished plate 200 comes out of the mold temperature controller 501, it enters a cooling bracket 504. As the semi-finished plate 200 moves on the cooling bracket 504, the semi-finished plate 200 comes into contact with the air, thereby being cooled.

[0093] In some preferred embodiments, in order to facilitate the adjustment of the distance between the traction roller assembly 400, the cooling mechanism 500 and the mold 300, the applicant sets a slide rail 505 arranged along the extension direction of the extruder 100 at the bottom of the traction roller assembly 400 and the cooling mechanism 500, and matched with the slide rail 505, the bottom of the traction roller assembly 400 and the cooling mechanism 500 is also provided with a pulley 506 that can drive the traction roller assembly 400 and the cooling mechanism 500 to move along the slide rail 505 to control the distance between the traction roller assembly 400 and the cooling mechanism 500 and the mold 300. Therefore, the operator can control the distance between the traction roller assembly 400 and the cooling mechanism 500 and the mold 300 by adjusting the position of the pulley 506 on the slide rail 505 to adapt to molds 300 of different sizes and shapes. At the same time, by adjusting the position of the pulley 506, the gap between the traction roller assembly 400 and the cooling mechanism 500 and the mold can be fine-tuned to achieve the desired deformation effect and cooling effect.

[0094] In order to reliably pull the semi-finished board 200, a pulling mechanism 600 driven by a driving mechanism such as a motor is also provided behind the cooling bracket 504, so that the semi-finished board 200 is input into the cutting mechanism 700 located behind the pulling mechanism 600, so as to realize the cutting of the semi-finished board 200 and finally obtain the finished non-PVC wood-plastic board.

[0095] In the present application, by changing the angle relationship between the output port 301 of the mold 300 and the horizontal plane, the angle between the direction in which the semi-finished board 200 is pulled by the traction roller assembly 400 along the output port 301 and the direction of the gravity to which the semi-finished board 200 itself is subjected is changed, thereby effectively overcoming the shrinkage and warping problems that do not occur in the extrusion process of the conventional board substrate made of polyvinyl chloride as raw material. At the same time, the mechanical strength, hardness and wear resistance of the board are unexpectedly improved. In addition, in the present application, by adding the non-polyvinyl chloride wood-plastic board deformation control device to the non-polyvinyl chloride wood-plastic board extrusion production line, the increase in the floor failure rate caused by the warping of the board is avoided.

[0096] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A deformation control device for non-polyvinyl chloride wood-plastic board, characterized in that: It comprises a mould fixedly connected to an extruder for outputting a semi-finished plate, and a traction roller assembly composed of a plurality of traction rollers and used for traction and shaping the semi-finished plate; the mould comprises an output port for outputting the semi-finished plate, and there is an angle between the output port and a horizontal plane, so that the direction in which the semi-finished plate is pulled by the traction roller assembly along the output port does not coincide with the direction of the gravity exerted on the semi-finished plate itself, and the angle between the two is less than 90 degrees.

2. A non-PVC wood-plastic board deformation control device according to claim 1, characterized in that: The traction roller assembly at least comprises an input traction roller pair for traction of the semi-finished plate in an inclined direction of the output port, and an output traction roller pair for transporting the semi-finished plate in a horizontal direction.

3. A deformation control device for non-PVC wood-plastic board according to claim 2, characterized in that: The angle between a perpendicular line of a center connecting line of two traction rollers in the input traction roller pair and a horizontal plane is greater than the angle between the output port and the horizontal plane.

4. A non-PVC wood-plastic board deformation control device according to claim 2, characterized in that: The center connecting line of the input traction roller pair intersects with the center connecting line of the output traction roller pair and is not perpendicular.

5. A non-PVC wood-plastic board deformation control device according to claim 2, 3 or 4, characterized in that: The input traction roller pair comprises a pair of traction rollers distributed in the vertical direction; wherein, The height of the output port of the die is greater than the height of the pulling rollers located below the input pulling roller pair.

6. A non-PVC wood-plastic board deformation control device according to any one of claims 1 to 4, characterized in that: The semi-finished plate output from the output port is pulled and transported along a tangent direction to the input pulling roller.

7. The deformation control device for non-PVC wood-plastic board according to claim 1, characterized in that: The angle between the output port and the horizontal plane is 30-60°.

8. The deformation control device for non-PVC wood-plastic board according to claim 1, characterized in that: The temperature of the pulling roller assembly is lower than the temperature of the output port; and The temperatures of the traction rollers in the traction roller assembly are increased sequentially along the conveying direction of the semi-finished plate.

9. A deformation control device for non-PVC wood-plastic board according to claim 8, characterized in that: The temperature difference between the traction roller used to input the semi-finished plate in the traction roller assembly and the temperature of the output port is 10-15°C; the temperature difference between the traction roller used to output the semi-finished plate in the traction roller assembly and the temperature of the output port is ≤10°C.

10. A non-PVC wood-plastic board deformation control device according to claim 1, 8 or 9, characterized in that: The traction roller comprises a traction roller body and a first temperature-controlled jacket covering the outside of the traction roller body; The first temperature-controlling jacket is filled with a temperature-controlling liquid which can control the surface temperature of the first temperature-controlling jacket.

11. A non-PVC wood-plastic board deformation control device according to claim 1, 8 or 9, characterized in that: The mold is provided with a temperature control device located outside the output port for controlling the temperature of the semi-finished plate output from the output port.

12. A deformation control device for non-PVC wood-plastic board according to claim 11, characterized in that: The temperature control device comprises a second temperature control jacket, and the interior of the second temperature control jacket is filled with temperature control liquid.

13. The deformation control device for non-PVC wood-plastic board according to claim 1, characterized in that: The deformation control device also includes a bearing seat for bearing the traction roller assembly; The bearing seat is also provided with a driving device for driving the traction roller in the traction roller assembly to move.

14. A deformation control device for non-PVC wood-plastic board according to claim 13, characterized in that: A shaping template for shaping the semi-finished plate is also arranged on the bearing seat behind the traction roller assembly.

15. A deformation control device for non-PVC wood-plastic board according to claim 1 or 13, characterized in that: The deformation control device also includes a mold hanger for hanging and fixing the mold.

16. A non-polyvinyl chloride wood-plastic board extrusion production line, characterized in that: It comprises the deformation control device of the non-polyvinyl chloride wood-plastic board as described in any one of claims 1 to 15.

17. A non-PVC wood-plastic board extrusion production line according to claim 16, characterized in that: The invention comprises an extruder, a deformation control device, a cooling mechanism, a traction mechanism and a cutting mechanism which are sequentially arranged along the material transmission direction.

18. The non-PVC wood-plastic board extrusion production line according to claim 17, characterized in that: The cooling device comprises a plurality of groups of powered cooling rollers and a plurality of groups of driven cooling rollers.

19. The non-PVC wood-plastic board extrusion production line according to claim 18, characterized in that: The cooling device also includes a cooling bracket arranged behind the powered cooling roller and the driven cooling roller.

20. A non-PVC wood-plastic board extrusion production line according to claim 17, 18 or 19, characterized in that: The bottom of the deformation control device and the cooling mechanism is provided with a slide rail arranged along the extension direction of the extruder; The bottom of the deformation control device and the cooling mechanism is also provided with a pulley which can drive the deformation control device and the cooling mechanism to move along the slide rail to control the distance between the deformation control device and the cooling mechanism and the mold.

21. Use of the non-PVC wood-plastic board deformation control device according to any one of claims 1 to 15 or the non-PVC wood-plastic board extrusion production line comprising the deformation control device according to any one of claims 16 to 20 in the preparation of non-PVC wood-plastic boards or non-PVC floors.

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