Double-color wood-plastic co-extrusion die

Abstract

This utility model provides a two-tone wood-plastic co-extrusion mold, belonging to the technical field of wood-plastic co-extrusion molds. It includes a material channel, with a main colorant extruder connected to the outside of the material channel via a flange. A secondary colorant flow channel plate is located behind the main colorant extruder, and the secondary colorant flow channel plate is connected to a secondary colorant extruder. This utility model solves the problem that existing wood-plastic co-extrusion molds typically co-extrude after mold forming. The resulting two-tone boards often suffer from delamination due to the sequential cooling during extrusion followed by further cooling during co-extrusion, as well as uneven cooling and stress.

Description

Technical Field

[0001] This utility model belongs to the technical field of wood-plastic co-extrusion molds, specifically relating to a two-tone wood-plastic co-extrusion mold. Background Technology

[0002] Wood-plastic composite (WPC) boards are a new type of decorative material mainly made of wood (wood cellulose, plant cellulose) as the base material, thermoplastic polymer materials (plastics), and processing aids. The mixture is homogeneously mixed and then extruded through a mold. It combines the properties and characteristics of both wood and plastic, making it a new type of composite material that can replace both. The main components of WPC boards are waste wood powder, wood chips, and wood slag. They possess good rigidity and toughness, allowing for nailing, drilling, grinding, sawing, planing, and painting. They are also resistant to deformation and cracking, making them the preferred green and environmentally friendly board material for the furniture industry, interior decoration industry, packaging industry, vehicle and ship interior decoration industry, and future wooden housing construction industry. This will undoubtedly spark a new revolution in the board material market. PVC wood-plastic wall panels, as a new era of environmentally friendly and durable wall panels for home decoration, are gradually becoming a focus product in the construction industry. However, the production equipment for PVC wood-plastic wall panels is relatively simple, and the technology of extrusion equipment is particularly outdated.

[0003] When using existing wood-plastic co-extrusion molds, co-extrusion is usually performed after the mold is formed. The resulting two-color boards are prone to delamination due to the stepwise cooling during extrusion followed by co-extrusion and cooling again. They also suffer from uneven cooling and stress. Summary of the Invention

[0004] This utility model provides a two-color wood-plastic co-extrusion mold, which aims to solve the problems of existing wood-plastic co-extrusion molds, which usually co-extrude after the mold is formed. The resulting two-color boards are prone to delamination due to the step-by-step cooling after extrusion and co-extrusion, as well as uneven cooling and stress.

[0005] This utility model embodiment provides a dual-color wood-plastic co-extrusion mold, including a feeding channel. The outside of the feeding channel is connected to a main color extruder via a flange. A secondary color extruder flow channel plate is provided on the rear side of the feeding channel behind the main color extruder. The secondary color extruder flow channel plate is externally connected to the secondary color extruder.

[0006] Furthermore, the interior of the secondary colorant flow channel plate includes an upper flow channel and a lower flow channel, and the ends of the upper flow channel and the lower flow channel are provided with colorant distribution areas, and the interior of the colorant distribution area is provided with a flow diversion and material blocking area.

[0007] By adopting the above technical solution, the upper and lower channels within the secondary colorant flow channel plate can divert and transport the secondary colorant, allowing it to enter the colorant distribution area via different paths. The colorant distribution area can evenly distribute the secondary colorant, while the diversion and blocking area can block and divert the secondary colorant, preventing excessive mixing within the distribution area. Simultaneously, it delays the contact time between the secondary and primary colorants, preventing premature merging and resulting color mixing, and ensuring clear texture at the color band boundaries.

[0008] Furthermore, both the upper and lower flow channels include inclined channels, horizontal channels, and branch channels, which are integrally formed. The inclined channels in the upper and lower flow channels are connected to the secondary colorant extruder.

[0009] By adopting the above technical solution, the inclined chute can smoothly guide the secondary colorant conveyed by the secondary colorant extruder into the transverse chute. The transverse chute can then transport the secondary colorant laterally, and the secondary colorant is then diverted to the colorant distribution area through the branch channels. The one-piece molded structural design ensures the sealing of the flow channel, reduces leakage of the secondary colorant during the conveying process, and makes the flow of the secondary colorant within the flow channel smoother, avoiding flow obstruction caused by flow channel connection problems. This ensures that the secondary colorant can be stably and evenly conveyed to the subsequent areas, laying the foundation for good mixing and molding of the subsequent colorants.

[0010] Furthermore, the length of the cross passage in the upper flow channel is greater than the length of the cross passage in the lower flow channel, and a boss is provided in the middle of the cross passage in the upper flow channel.

[0011] By adopting the above technical solution, the length of the upper flow channel is greater than that of the lower flow channel, which allows for a difference in the arrival time of the secondary colorants in the upper and lower flow channels at the colorant distribution area. This prevents excessive mixing caused by the simultaneous large influx of both secondary colorants into the colorant distribution area. Furthermore, the protrusions can block and divert the secondary colorants flowing through the upper flow channel, slowing down their flow rate and further adjusting the rhythm of their entry into the colorant distribution area. This results in a more uniform distribution of the secondary colorants within the colorant distribution area, reducing localized color mixing caused by concentrated secondary colorants.

[0012] Furthermore, the boss is provided in multiple forms.

[0013] By adopting the above technical solution, multiple bosses can repeatedly block and divert the secondary color material flowing through the upper flow channel, more effectively slowing down the flow speed of the secondary color material and dispersing it into multiple small-flow streams. This makes the flow of the secondary color material within the channel more stable, avoiding uneven flow rates, thus ensuring that the secondary color material is evenly distributed when it enters the color material distribution area. This further improves the texture clarity after the secondary color material combines with the main color material, enhancing the appearance quality of the product.

[0014] Furthermore, the outlets of the upper and lower flow channels are provided with multiple semi-arc plates, which are arranged in a stepped manner from the outside to the inside.

[0015] By adopting the above technical solution, the multi-layered semi-circular plates are arranged in a stepped manner, allowing the secondary colorant to flow out of the outlet in a stepped flow pattern. This structure delays the contact between the secondary and primary colorants, allowing the secondary colorant to maintain its own shape and distribution after flowing out, gradually combining with the primary colorant. Simultaneously, the arc-shaped structure of the semi-circular plates guides the flow direction of the secondary colorant, enabling it to be more evenly distributed on the surface or inside the primary colorant, avoiding color mixing caused by localized accumulation of secondary colorant and ensuring clear boundaries between the two colors.

[0016] Furthermore, the semi-arc plate is arranged in a stepped pattern with varying heights.

[0017] By adopting the above technical solution, the stepped semi-circular plates with varying heights create a staggered material flow distribution when the secondary colorant flows out. The semi-circular plates at different heights guide the secondary colorant to contact the primary colorant at different positions, further preventing rapid mixing of the secondary colorant on the same plane and increasing the sense of layering between the secondary and primary colorants.

[0018] Furthermore, a conical plate is fixed to the wall of the innermost semi-circular plate, and the bottom of the conical plate divides the surface of the wood-plastic composite board into multiple areas, wherein the main colorant is pressed onto the bottom of the conical plate.

[0019] By adopting the above technical solution, the bottom of the cone plate can divide the surface of the wood-plastic composite board into areas, so that the main color material is confined to the bottom area of ​​the cone plate, while the secondary color material is distributed in other divided areas, avoiding the two from mixing randomly over a large area. This spatially isolates the two color materials, further ensuring the clarity of the boundary between the two colors, and solving the problem of color mixing and texture blurring caused by premature contact of color materials in existing molds.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. This utility model, through the design of upper and lower flow channels, allows the inclined channel to smoothly guide the secondary color material conveyed by the secondary color material extruder into the horizontal channel. The horizontal channel can then transport the secondary color material laterally, and the secondary color material is further distributed to the color material distribution area through the branch channels. The one-piece molded structure design ensures the sealing of the flow channels, reduces leakage of the secondary color material during the conveying process, and makes the flow of the secondary color material within the flow channels smoother, avoiding flow obstruction caused by flow channel connection problems, and ensuring that the secondary color material can be stably and evenly conveyed to the subsequent areas.

[0022] 2. By setting up the boss, the secondary color material in the upper channel and the secondary color material in the lower channel arrive at the color material distribution area at different times. The boss can block and divert the secondary color material flowing through the cross channel of the upper channel, slow down the flow speed of the secondary color material, and further adjust the rhythm of the secondary color material entering the color material distribution area, so that the distribution of the secondary color material in the color material distribution area is more uniform and the local color mixing phenomenon caused by the concentration of secondary color material is reduced.

[0023] 3. This utility model, through the setting of a semi-circular plate and a conical plate, allows the bottom of the conical plate to divide the surface of the wood-plastic composite board into areas, confining the main color material to the bottom area of ​​the conical plate, while the secondary color material is distributed in other divided areas. This avoids the two colors mixing randomly over a large area, spatially isolating the two color materials and further ensuring the clarity of the boundary between the two colors. It solves the problem of color mixing and blurred texture caused by premature contact of color materials in existing molds. At the same time, it avoids the problems of stress and uneven cooling caused by co-extrusion after molding.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a side-top view of the structure of an embodiment of the present utility model;

[0027] Figure 2 This is a side view of the mold structure according to an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the mold according to an embodiment of the present utility model;

[0029] Reference numerals in the attached diagram: 1. Feed channel; 2. Main pigment extruder; 3. Secondary pigment flow channel plate; 31. Upper flow channel; 32. Lower flow channel; 33. Pigment distribution area; 34. Diversion and baffle area; 35. Inclined channel; 36. Horizontal channel; 361. Boss; 37. Diversion branch channel; 38. Semi-arc plate; 381. Conical plate; 4. Secondary pigment extruder. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] Reference Figures 1-3 This utility model embodiment proposes a dual-color wood-plastic co-extrusion mold, including a feeding channel 1. The outside of the feeding channel 1 is connected to a main color material extruder 2 via a flange. A secondary color material flow channel plate 3 is provided at the rear side of the main color material extruder 2 in the feeding channel 1. The secondary color material flow channel plate 3 is connected to a secondary color material extruder 4. The interior of the secondary color material flow channel plate 3 includes an upper flow channel 31 and a lower flow channel 32. The ends of the upper flow channel 31 and the lower flow channel 32 are provided with a color material distribution area 33. The interior of the color material distribution area 33 is provided with a diversion and blocking area 34. The upper flow channel 31 and the lower flow channel 32 in the secondary color material flow channel plate 3 can divert and transport the secondary color material, so that the secondary color material can enter the color material distribution area 33 from different paths. The colorant distribution area 33 can evenly distribute the secondary colorant, while the diversion and blocking area 34 can block and divert the secondary colorant, preventing it from being over-mixed in the colorant distribution area 33. At the same time, it delays the contact time between the secondary colorant and the primary colorant, preventing color mixing problems caused by premature merging, and ensuring clear texture at the junction of the color bands.

[0032] Reference Figures 1-3 Both the upper flow channel 31 and the lower flow channel 32 include an inclined chute 35, a horizontal chute 36, and a branch channel 37. The inclined chute 35, horizontal chute 36, and branch channel 37 are integrally formed. The inclined chute 35 in the upper flow channel 31 and the lower flow channel 32 is connected to the secondary color material extruder 4. The inclined chute 35 can smoothly guide the secondary color material conveyed by the secondary color material extruder 4 into the horizontal chute 36. The horizontal chute 36 can laterally convey the secondary color material, and then the branch channel 37 can divert the secondary color material to the color material distribution area 33. The integrally formed structural design ensures the sealing of the flow channel, reduces leakage of the secondary color material during the conveying process, and makes the flow of the secondary color material in the flow channel smoother, avoiding flow obstruction caused by flow channel connection problems. This ensures that the secondary color material can be stably and evenly conveyed to the subsequent areas, laying the foundation for good mixing and forming of the subsequent color materials.

[0033] Reference Figures 1-3The length of the cross passage 36 in the upper channel 31 is greater than the length of the cross passage 36 in the lower channel 32. A boss 361 is provided in the middle of the cross passage 36 in the upper channel 31. The length of the cross passage 36 in the upper channel 31 is greater than the length of the cross passage 36 in the lower channel 32. This allows the secondary colorant in the upper channel 31 and the secondary colorant in the lower channel 32 to arrive at the colorant distribution area 33 at different times, thus avoiding excessive mixing caused by the two secondary colorants simultaneously flooding into the colorant distribution area 33 in large quantities. The protrusions 361 can block and divert the secondary color material flowing through the upper flow channel 31 and the cross channel 36, slowing down the flow speed of the secondary color material and further adjusting the rhythm of the secondary color material entering the color distribution area 33. This makes the distribution of the secondary color material in the color distribution area 33 more uniform, reducing local color mixing caused by the concentration of secondary color material. Multiple protrusions 361 can block and divert the secondary color material flowing through the upper flow channel 31 and the cross channel 36 multiple times, more effectively slowing down the flow speed of the secondary color material and dispersing it into multiple small-flow streams. This makes the flow of the secondary color material in the cross channel 36 more stable, avoiding uneven flow rates, thus ensuring that the secondary color material is evenly distributed when it enters the color distribution area 33. This further improves the texture clarity after the secondary color material combines with the main color material, enhancing the appearance quality of the product.

[0034] Reference Figures 1-3 The outlets of the upper flow channel 31 and the lower flow channel 32 are equipped with multiple semi-arc plates 38. The semi-arc plates 38 are arranged in a stepped shape from the outside to the inside. This stepped arrangement of the multiple semi-arc plates 38 allows the secondary color material to flow out of the outlet in a stepped flow pattern. This structure can delay the contact between the secondary color material and the primary color material, allowing the secondary color material to maintain its own shape and distribution after flowing out, and gradually combine with the primary color material. At the same time, the arc-shaped structure of the semi-arc plates 38 can guide the flow direction of the secondary color material, so that the secondary color material can be more evenly distributed on the surface or inside of the primary color material, avoiding color mixing caused by local accumulation of secondary color material, and ensuring clear boundaries of the two-tone color scheme.

[0035] Reference Figures 1-3 The semi-circular plates 38 are arranged in a stepped pattern with varying heights, which allows the secondary colorant to flow out in a staggered and orderly manner. The semi-circular plates 38 at different heights guide the secondary colorant to contact the primary colorant at different positions, further preventing the secondary colorant from mixing rapidly on the same plane and increasing the sense of layering between the secondary and primary colorants.

[0036] Reference Figures 1-3The innermost semi-circular plate 38 has a cone plate 381 fixed to its wall. The bottom of the cone plate 381 divides the surface of the wood-plastic composite board into multiple areas. The main colorant is pressed onto the bottom of the cone plate 381. The bottom of the cone plate 381 can divide the surface of the wood-plastic composite board into areas, so that the main colorant is confined to the bottom area of ​​the cone plate 381, while the secondary colorant is distributed in other areas, avoiding the two from mixing randomly over a large area. It spatially isolates the two colorants, further ensuring the clarity of the boundary between the two colors. It solves the problem of color mixing and blurred texture caused by the premature contact of colorants in existing molds. It also avoids the problems of easy delamination, uneven cooling, and stress caused by co-extrusion after mold forming in existing molds, which involves step-by-step cooling after extrusion molding and then co-extrusion cooling again.

[0037] The specific implementation method is as follows: The main colorant is conveyed to the feed channel 1 through the flange of the main colorant extruder 2. Under the pressure of the extruder, it is pushed forward along the feed channel 1, maintaining a continuous and stable flow state within the feed channel 1, and moving towards the subsequent forming area of ​​the mold, laying the foundation for the final bonding with the secondary colorant. At the same time, the secondary colorant is conveyed by the secondary colorant extruder 4 to the upper flow channel 31 and lower flow channel 32 of the secondary colorant flow channel plate 3. It is then introduced into the cross channels 36 of the two flow channels through the inclined channel 35. The cross channel 36 of the upper flow channel 31 is longer and has multiple protrusions 361. When the secondary colorant flows through it, it is blocked and diverted multiple times, and the flow rate is slowed down, forming a dispersed small flow. The cross channel 36 of the lower flow channel 32 is shorter, and the flow rate of the secondary colorant is relatively faster, forming a time difference with the secondary colorant in the upper flow channel 31. This avoids the two flow streams from accumulating synchronously in the colorant distribution area 33, and the diversion and blocking area 3... 4. Further separation of secondary colorants entering the colorant distribution area 33 prevents excessive mixing of secondary colorants from different paths before they merge, ensuring that the secondary colorants maintain a stable distribution. Then, when the secondary colorants flow out through the outlets of the upper flow channel 31 and the lower flow channel 32, they form a staggered flow through multiple stepped semi-arc plates 38. The high and low arc plates 38 guide the secondary colorants to contact the main colorants at different heights, avoiding rapid color mixing in a single plane. The cone plate 381 of the innermost arc plate 38 divides the surface of the wood-plastic composite board into multiple areas. The main colorant is confined to the bottom area of ​​the cone plate 381, while the secondary colorants are distributed in the surrounding areas. Spatial isolation further delays the mixing time of the main and secondary colorants, ensuring clear texture at the junction. Finally, the main and secondary colorants, after the above-mentioned graded control, are co-extruded together at the end of the mold to form a two-tone wood-plastic composite board with distinct boundaries and clear texture.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A two-tone wood-plastic co-extrusion mold, comprising a feeding channel (1), characterized in that, The feed channel (1) is connected to the main pigment extruder (2) via a flange. The feed channel (1) is provided with a secondary pigment flow channel plate (3) at the rear side of the main pigment extruder (2). The secondary pigment flow channel plate (3) is connected to the secondary pigment extruder (4).

2. The two-tone wood-plastic co-extrusion mold according to claim 1, characterized in that: The interior of the secondary colorant flow channel plate (3) includes an upper flow channel (31) and a lower flow channel (32). The ends of the upper flow channel (31) and the lower flow channel (32) are provided with a colorant distribution area (33), and the interior of the colorant distribution area (33) is provided with a flow diversion and blocking area (34).

3. The two-tone wood-plastic co-extrusion mold according to claim 2, characterized in that: The upper flow channel (31) and the lower flow channel (32) both include an inclined channel (35), a horizontal channel (36) and a branch channel (37). The inclined channel (35), the horizontal channel (36) and the branch channel (37) are integrally formed. The inclined channel (35) in the upper flow channel (31) and the lower flow channel (32) is connected to the secondary colorant extruder (4).

4. The two-tone wood-plastic co-extrusion mold according to claim 3, characterized in that: The length of the cross passage (36) in the upper flow channel (31) is greater than the length of the cross passage (36) in the lower flow channel (32), and a boss (361) is provided in the middle of the cross passage (36) in the upper flow channel (31).

5. A two-tone wood-plastic co-extrusion mold according to claim 4, characterized in that: The boss (361) is provided in multiple forms.

6. The two-tone wood-plastic co-extrusion mold according to claim 5, characterized in that: The outlets of the upper flow channel (31) and the lower flow channel (32) are provided with multiple semi-arc plates (38), which are arranged in a stepped manner from the outside to the inside.

7. A two-tone wood-plastic co-extrusion mold according to claim 6, characterized in that: The semi-arc plate (38) is arranged in a stepped manner with high and low intervals.

8. A two-tone wood-plastic co-extrusion mold according to claim 7, characterized in that: The innermost semi-circular plate (38) has a cone plate (381) fixed to its wall surface. The bottom of the cone plate (381) divides the surface of the wood-plastic composite board into multiple areas, wherein the main colorant is pressed onto the bottom of the cone plate (381).

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