A production device for imitating wood grain co-extrusion mixed color wood-plastic composite material

Abstract

The invention discloses a production device for a wood-grain imitation co-extruded mixed-color wood-plastic composite material, comprising a first extrusion component, a component transition connector, a co-extrusion module, an embossing machine, a shaping table and a cutting machine. The co-extrusion module is provided with a second extrusion component and a wood-grain control component, and the wood-grain control component has a cylindrical gap. This production device effectively solves the problem that when the fabric and the masterbatch are added simultaneously, the masterbatch is excessively melted and easily disturbed by the fabric dissolution, resulting in an unsatisfactory or no imitation wood-grain effect, which is caused by unstable flow rate. At the same time, the amount of the masterbatch added is in a controllable state, and the imitation wood-grain produced is naturally in a controllable state. This invention is used in the field of wood-plastic composite material production.

Description

Technical Field

[0001] The invention relates to the field of wood-plastic composite material production, in particular to a production device for a wood-grain imitation co-extruded mixed-color wood-plastic composite material. Background Art

[0002] Co-extruded wood-plastic composite materials are the second generation of new environmentally friendly wood-plastic composite materials that have emerged in recent years at home and abroad. From a structural point of view, the material includes a core material and a fabric that wraps the core material, and the wood grain effect is reflected in the fabric. The preparation method refers to the use of thermoplastic plastics (polyethylene, polypropylene and polyvinyl chloride, etc.) and wood powder, rice husks, straw and other waste plant fibers mixed into a core layer material extruded to the die through a conical twin-screw extruder, and then combined with a coating fabric containing polymer materials and masterbatches extruded by a single-screw extruder to extrude into a profile with different wood grain effects on the surface; this profile has the performance and characteristics of both wood and plastic, and is a new composite material that can replace wood and plastic, and is mainly used in building materials, furniture, logistics packaging and other industries.

[0003] At present, the wood grain appearance of profiles produced by traditional single-screw extruders has some shortcomings that cannot be ignored. The most common problem is that the imitation wood grain effect is not ideal, the dispersion is uneven, there is or is not, and unilateral flow lines are prone to occur. Compared with the original wood, the color and texture of the co-extruded mixed-color wood-plastic material are unnatural and lack of wood feel. Summary of the invention

[0004] The purpose of the present invention is to provide a production device for imitating wood grain co-extrusion mixed color wood-plastic composite materials, which can optimize the process of adding fabrics containing polymer materials and masterbatches, so that the surface of the final profile has the color and texture of wood.

[0005] The technical solution adopted by the present invention is:

[0006] A production device for imitation wood grain co-extruded mixed color wood-plastic composite material, comprising a first extrusion component, a second extrusion component and a co-extrusion module connected to each other, the output ends of the first extrusion component and the second extrusion component are respectively connected to the two input ends of the co-extrusion module, the first extrusion component is used to input a mixture of polymer materials and waste plants, and the second extrusion component is used to input fabrics. In the traditional scheme, the two are mixed in the co-extrusion module and then extruded to form, wherein the mixture is used as a core layer and the fabric is used as a surface layer. The production device also includes: a fabric inlet, which is arranged at a position of the second extrusion component away from the co-extrusion module; and a masterbatch inlet, which is arranged at a position of the second extrusion component close to the co-extrusion module.

[0007] Since the melting points of fabrics and masterbatches are different, by inputting the raw materials separately at different stages and then adjusting the appropriate heating temperature, it is easy to control both to be in a similar molten state before reaching the co-extrusion module, and the texture of the finished surface will be more uniform.

[0008] The production device also includes a wood grain control component, which is arranged between the end of the second extrusion component and the co-extrusion module, including a shell and a mixing module fixed inside the shell. The inside of the shell and the mixing module are both rotating body structures, and the front and rear ends of the shell are respectively connected to the second extrusion component and the co-extrusion module. There is a gap between the mixing module and the shell, and the front end of the mixing module near the second extrusion component is a structure with a narrow head and a wide body. After the fabric is mixed with the masterbatch and contacts the mixing module, it will be squeezed into the gap around the mixing module. In addition to moderately plasticizing the masterbatch to achieve a linear and obvious wood grain effect, it can also make the masterbatch evenly distributed in the fabric.

[0009] As an improvement to the above solution, the melting point of general masterbatch is relatively low, and after the masterbatch is squeezed into the gap between the mixing module and the shell, it has a chance to obtain enough heat to be transformed into a molten state by relying on friction; another possibility is that the masterbatch directly absorbs part of the heat from the molten fabric, thereby being transformed into a molten state. However, the shell is provided with a heating component, which can make it easier to heat the masterbatch and improve production efficiency.

[0010] As an improvement of the above scheme, the heating component is an electric heating wire or a heat pipe or an induction coil, wherein the electric heating wire can be wound on the outer shell; the heat pipe can also be wound on the outer shell; the induction coil refers to induction heating, and the induction coil is distributed around the outer shell.

[0011] As an improvement of the above solution, the front end of the mixing module is hemispherical, conical or prismatic, which reduces the resistance of the fabric and masterbatch entering the gap.

[0012] As an improvement of the above solution, the rear end of the mixing module is provided with a chamfer to facilitate the subsequent mechanism to pull out the cylindrical mixture.

[0013] As an improvement of the above solution, the masterbatch inlet is connected to a third extrusion component, the third extrusion component is a single-screw extruder, and a programmable masterbatch metering conveyor is provided at the input end of the third extrusion component.

[0014] As an improvement of the above solution, the third extrusion component and the masterbatch metering conveyor are connected to a controller, and the controller identifies the amount of masterbatch input and controls the motor speed of the third extrusion component.

[0015] As an improvement of the above solution, the first extrusion component is a conical twin-screw extruder, the second extrusion component is a single-screw extruder, and each extrusion component is connected to a controller, which controls the motor speeds of the three mechanisms respectively.

[0016] As an improvement of the above solution, the output end of the co-extrusion module is provided with an embossing machine, a shaping table and a cutting machine according to the process sequence, thus forming a complete production line; the above components can be directly purchased from the market.

[0017] Beneficial effects of the present invention:

[0018] This production device adds fabric and masterbatch separately, effectively solving the existing problem that when both are added at the same time, the masterbatch is over-melted and easily disturbed by the melting of fabric, resulting in unstable flow rate, which leads to unsatisfactory or no imitation wood grain effect. At the same time, the amount of masterbatch added is in a controllable state, and the imitation wood grain produced is naturally in a controllable state. Through the above technical solution, the effect of the masterbatch can be maximized, and the amount of products with the same color can be reduced, reducing costs; at the same time, the structure of the wood grain control component can be further fine-tuned to adapt to masterbatch with different melting indexes, effectively solving the limitations of the existing technology on the use of masterbatch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the entire production device;

[0021] Figure 2 It is a schematic diagram of the wood grain control component. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0025] Reference Figure 1 and Figure 2 The present invention is a production device for a wood-grain imitation co-extrusion mixed-color wood-plastic composite material.

[0026] Overall, Figure 1From left to right in the figure are the first extrusion component 1, the component transition connector, the co-extrusion module 4, the embossing machine, the shaping table 6 and the cutting machine 7. After being extruded, the mixture of polymer material and waste plants gradually moves from left to right to form the first production path. A second extrusion component 2 is provided at the other input end of the co-extrusion module 4 to further introduce fabrics and masterbatches. The above three are compounded together in the co-extrusion module 4. Figure 1 It can be seen that the output ends of the first extrusion component 1 and the second extrusion component 2 are respectively connected to the two input ends of the co-extrusion module 4 , and there is a gap between the embossing machine, the shaping table 6 and the cutting machine 7 .

[0027] In this embodiment, the first extrusion component 1 adopts a conical twin-screw extruder, and the second extrusion component 2 adopts a single-screw extruder, which has a strong continuous production capacity; in other embodiments, a horizontal push extruder is also used. The above components are all relatively mature equipment. This application mainly optimizes the second extrusion component 2 and the wood grain control component 9 located between the second extrusion component 2 and the co-extrusion module 4.

[0028] Figure 1 The middle trapezoidal frame represents the feeding funnel. It can be seen that the fabric inlet is set at the position of the second extrusion component 2 away from the co-extrusion module 4, which is basically at the starting position of the single screw of the second extrusion component 2; the masterbatch inlet is set at the position of the second extrusion component 2 close to the co-extrusion module 4, which is basically at the end position of the second extrusion component 2. When the masterbatch is added at this position, the masterbatch is usually still in fine granular form. Since the melting points of the fabric and the masterbatch are different, by inputting the raw materials separately at different stages and then reasonably controlling the heating temperature, it is easy to control both to be in a similar molten state before reaching the co-extrusion module 4, and the texture of the finished surface will be more uniform.

[0029] In order to achieve a better imitation wood grain effect, the solution of the present application introduces a wood grain control component 9 on this basis, and the wood grain control component 9 is arranged between the second extrusion component 2 and the co-extrusion module 4.

[0030] Specific reference Figure 2 The wood grain control component 9 includes a shell 91 and a mixing module 92 fixed inside the shell 91. The inside of the shell 91 and the mixing module 92 are both rotating body structures. Flanges are provided at both ends of the shell 91. The shell 91 is connected to the second extrusion component 2 and the co-extrusion module 4 at both ends. The mixing module 92 is a structure with a narrow head and a wide body near the front end of the second extrusion component 2. After the fabric and the masterbatch are mixed and contacted with the mixing module 92, they will be squeezed and mixed and evenly dispersed to the gap around them. This gap is also called a molten pool. Figure 2 The dotted line in the figure indicates the flow path of the mixture. In this embodiment, the molten pool not only plasticizes the masterbatch appropriately to achieve a linear and obvious wood grain effect, but also enables the masterbatch to be evenly distributed in the fabric.

[0031] Since the melting point of general masterbatch is relatively low, the masterbatch can obtain enough heat to be transformed into a molten state by friction after being squeezed into the gap between the mixing module 92 and the housing 91. However, the housing 91 is provided with a heating component, which makes it easier to heat the masterbatch and improve production efficiency.

[0032] Since the mixing module 92 needs to be fixed to the housing 91 through the bracket 93, in order to reduce friction, the bracket 93 is set to be as thin and narrow as possible, the length is also shortened as much as possible, and the corners of the bracket 93 are rounded; the mixture is fluid, although the mixture will be temporarily separated, it will eventually come together.

[0033] In this embodiment, the heating component is a heating wire, the housing 91 is made of metal with good thermal conductivity, and the mixing module 92 is a solid metal structure. In this case, the heating wire can be wound around the housing 91, which is very simple. Figure 2 The heating component is not shown in the figure; in order to protect the electric heating wire and prevent accidental burns, a layer of heat insulation cotton can be wrapped on the shell 91. The heat pipe and the induction coil are arranged in the same way.

[0034] The front end of the mixing module 92 is hemispherical or conical, which reduces the resistance of the fabric and masterbatch entering the gap. Figure 2 It can be seen that the front end of the mixing module 92 is slightly protruding. Accordingly, the rear end of the mixing module 92 is provided with a chamfer, and the size of the chamfer is relatively large. At this time, there is already a relatively large outlet between the mixing module 92 and the housing 91, which is convenient for the subsequent mechanism to pull out the cylindrical mixture.

[0035] In other embodiments, the masterbatch is directly put into the masterbatch inlet. In this embodiment, the masterbatch inlet is connected to the third extrusion component 3, and the third extrusion component 3 is a single screw extruder accordingly. A programmable masterbatch metering conveyor is arranged at the input end of the third extrusion component 3, and this design can accurately control the amount of masterbatch added. The third extrusion component 3 and the masterbatch metering conveyor are both connected to a controller, and the controller identifies the amount of masterbatch added and controls the motor speed of the third extrusion component 3, so as to achieve the purpose of automatically controlling the wood grain thickness and flow effect.

[0036] In this embodiment, the controller controls the motor speeds of the three extruder main machines respectively to achieve control of the overall processing speed. Figure 1 It can be seen that a control panel 8 and a display screen of the controller are provided on the same side of the second extrusion component, which is convenient for observation and control.

[0037] Of course, the present invention is not limited to the above-mentioned embodiments, and the combination of different features of the above-mentioned embodiments can also achieve good results. Those skilled in the art can also make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A production device for a wood-grain co-extruded mixed-color wood-plastic composite material, comprising a first extrusion component, a second extrusion component and a co-extrusion module connected to each other, wherein the output ends of the first extrusion component and the second extrusion component are respectively connected to the two input ends of the co-extrusion module, characterized in that Also includes: A fabric inlet is arranged at the front end of the second extrusion component; A masterbatch inlet is provided at the rear end of the second extrusion component; The wood grain control component is arranged between the end of the second extrusion component and the co-extrusion module, and is connected to the above two components at the same time. It includes an outer shell and a mixing module fixed inside the outer shell. The head and tail ends of the outer shell are respectively connected to the second extrusion component and the co-extrusion module. There is a gap between the mixing module and the outer shell. The mixing module is close to the front end of the second extrusion component and has a narrow head and a wide body.

2. The production device according to claim 1, characterized in that: The shell is provided with a heating component.

3. The production device according to claim 2, characterized in that: The heating component is a heating wire, a heat pipe or an induction coil.

4. The production device according to claim 1, characterized in that: The front end of the mixing module is hemispherical, conical or prismatic.

5. The production device according to claim 4, characterized in that: The tail end of the mixing module is provided with a chamfer.

6. The production device according to claim 1, characterized in that: The masterbatch inlet is connected to the third extrusion component, the third extrusion component is a single-screw extruder, and the input end of the third extrusion component is provided with a programmable masterbatch metering conveyor.

7. The production device according to claim 6, characterized in that: The third extrusion component and the masterbatch metering conveyor are connected with a controller, and the controller identifies the input amount of the masterbatch and controls the motor speed of the third extrusion component.

8. The production device according to claim 7, characterized in that: The first extrusion component is a conical twin-screw extruder, and the second extrusion component is a single-screw extruder. Each extrusion component is connected to a controller, and the controller controls the motor speeds of the three mechanisms respectively.

9. The production device according to any one of claims 1 to 8, characterized in that: The output end of the co-extrusion module is provided with an embossing machine, a shaping table and a cutting machine according to the process sequence.

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