CN111070623B - Preparation method of wood-grain-like co-extrusion color-mixing wood-plastic composite material - Google Patents
Preparation method of wood-grain-like co-extrusion color-mixing wood-plastic composite material Download PDFInfo
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- CN111070623B CN111070623B CN201911226450.1A CN201911226450A CN111070623B CN 111070623 B CN111070623 B CN 111070623B CN 201911226450 A CN201911226450 A CN 201911226450A CN 111070623 B CN111070623 B CN 111070623B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/286—Raw material dosing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
Abstract
The invention discloses a preparation method of a wood-like co-extrusion mixed-color wood-plastic composite material, which effectively solves the current situation that the wood-like effect is not ideal, or has or does not have when color master is excessively melted and the flow rate is unstable due to the dissolution interference of the fabric when the color master and the color master are added simultaneously in the prior art by separately adding the fabric and the color master on the basis of the prior art. Meanwhile, the addition amount of the color master is in a controllable state, and the produced wood grain imitation is also in a controllable state naturally; the scheme can exert the color master effect to the maximum extent, and the products with the same color can reduce the addition amount and reduce the cost; meanwhile, the structure of the wood grain control part can be further finely adjusted, the wood grain control part is suitable for color masterbatches with different melt indexes, and the limitation of the prior art on the use of the color masterbatches is effectively solved. The invention is used in the field of wood-plastic composite material production.
Description
Technical Field
The invention relates to the field of wood-plastic composite material production, in particular to a preparation method of a wood-like co-extrusion mixed color wood-plastic composite material.
Background
The co-extrusion wood-plastic composite material is a second generation novel environment-friendly wood-plastic composite material which is formed at home and abroad in the present year, and is a section bar with the effect of unnecessary wood grains on the surface through converging and entering in and out of a coating fabric which is extruded by a single screw extruder and contains a high polymer material and color master, wherein the core layer material is formed by mixing polyethylene, polypropylene, polyvinyl chloride and other waste plant fibers such as wood flour, rice husks, straws and the like, is extruded to a machine head through a conical double screw; structurally, the profile comprises an inner core and a surface layer wrapping the inner core, and the wood grain effect is embodied on the surface layer. The section bar has the performance and characteristics of wood and plastic, is a novel composite material capable of replacing wood and plastic, and is mainly used in industries such as building materials, furniture, logistics packaging and the like.
At present, the appearance of the wood grain of the section produced by the traditional single-screw extruder has the defect of being not negligible, the most common problems are that the wood grain imitation effect is not ideal, the dispersion is not uniform, or the phenomenon of unilateral flow lines is easy to appear or not, and compared with the original wood, the color and the patterns of the co-extrusion color-mixing wood-plastic material are unnatural and lack of wood texture.
Disclosure of Invention
The invention aims to provide a preparation method of a wood-grain-like co-extrusion mixed-color wood-plastic composite material, which optimizes the color master addition process and is used for processing the composite material with stable and beautiful wood grain effect.
The technical scheme adopted by the invention is as follows:
the preparation method of the wood-like co-extrusion color-mixing wood-plastic composite material comprises a first extrusion part, a second extrusion part and a co-extrusion module which are communicated with each other, wherein the output ends of the first extrusion part and the second extrusion part are respectively connected with two input ends of the co-extrusion module, and the preparation method comprises the following steps: the first extrusion part outputs a raw material mixture to the co-extrusion module, meanwhile, the second extrusion part is far away from one end of the co-extrusion module and is added with the fabric, the second extrusion part is close to one end of the co-extrusion module and is added with the color master, the fabric and the color master are mixed at the position, close to the co-extrusion module, of the second extrusion part, then the fabric and the color master penetrate through a narrow slit with a long and thin cross section to form a sheet structure, and finally the composite material mixture is coated in the co-extrusion module and is output to the profile by the co-. According to the design scheme, the fabric and the color master are added at different positions respectively, the temperature of the fabric and the color master when being mixed is controlled conveniently and reasonably, the fabric and the color master are easily in different melting states before reaching the co-extrusion module, and the wood grain color and the uniformity are good. The fabric and the color master are limited in a narrow space, so that the color master and the shallow layer of the fabric are conveniently and uniformly mixed, and the color master in the mixture can be ensured to be uniform even if the mixture discharged finally is mixed again.
As an improvement of the scheme, the fabric is heated to a molten state when the second extrusion part is put into the fabric, and the color master keeps granular or powdery when the second extrusion part is put into the fabric. Because the melting point of the color master is generally low, the design scheme avoids excessive melting of the color master. When the color master is mixed with the molten fabric, partial heat can be absorbed from the fabric, friction heat generated in narrow-slit movement can be absorbed, and the color master can absorb enough heat without an external heating device.
As an improvement of the scheme, the second extrusion part is provided with a third extrusion part, color master is firstly put into the third extrusion part and then is sent into the second extrusion part through the third extrusion part, and the third extrusion part is connected with the controller to control the adding amount of the color master.
As an improvement of the scheme, the first extrusion part, the second extrusion part and the third extrusion part are all screw extruders and are connected with a controller, and the controller respectively controls the motor rotating speeds of the three extrusion parts so as to adjust the quantity of materials entering the co-extrusion module.
As an improvement of the scheme, the heating temperature in the first extrusion part is 130-210 ℃, the heating temperature in the second extrusion part is 100-200 ℃, the temperature of the feeding side is higher, and the raw materials are conveyed at constant temperature after being basically melted.
As an improvement of the scheme, the first extrusion part adopts a double-screw extrusion main machine, the first extrusion part is divided according to the feeding and discharging sequence, the heating temperature of the first screw cylinder zone is 170-210 ℃, the heating temperature of the second screw cylinder zone is 160-200 ℃, the heating temperature of the third screw cylinder zone is 140-170 ℃, the heating temperature of the four-zone mixing module is 130-160 ℃, the heating temperature of the confluence core is 130-150 ℃, and the heating temperature of the core layer die zone is 140-170 ℃. The second extrusion part adopts a single-screw extrusion main machine, and is divided according to the feeding and discharging sequence, the heating temperature of the first screw cylinder area is 100-160 ℃, the heating temperature of the second screw cylinder area is 150-190 ℃, the heating temperature of the third screw cylinder area is 160-200 ℃, the heating temperature of the four-area mixing module is 140-190 ℃, the heating temperature of the fifth screw cylinder area is 140-190 ℃, and the heating temperature of the surface layer die area is 160-200 ℃.
As an improvement of the scheme, the fabric and the color master are heated when passing through the narrow slit, so that the fabric and the color master have different molten states, and the whole process is conveniently controlled by heating the mixture of the fabric and the color master in the step.
As an improvement of the scheme, the inlet of the narrow slit is gradually narrowed from outside to inside, so that the mixture of the fabric and the color master can conveniently enter the narrow slit, the thickness of the middle section of the narrow slit is kept unchanged, the width of the narrow slit can be slightly increased at the outlet of the narrow slit, and the mixture can conveniently flow out.
As an improvement of the scheme, the narrow slit is circular, and the fabric and the color master after passing through the narrow slit form a cylinder shape. In other embodiments, the cross section of the narrow slit can be rectangular or semi-arc-shaped, and accordingly the fabric and the color master after passing through the narrow slit form a plate structure.
The improvement of the scheme comprises a shell which is transparent from head to tail and a mixing module which is fixed in the shell, wherein the shell and the mixing module are both made of metal materials with good heat conducting performance, a heating part is arranged on the outer side of the shell, and a gap is formed between the shell and the mixing module and forms the narrow gap.
As an improvement of the scheme, the section bar output by the co-extrusion module is further processed by an embossing procedure, a shaping procedure and a cutting procedure, and finally, a commodity is manufactured.
The invention has the beneficial effects that: according to the preparation method, the fabric and the color master are added separately, so that the current situation that the wood grain imitation effect is not ideal, or the wood grain imitation effect is existed or is existed due to unstable flow rate caused by excessive melting of the color master and easy interference of the fabric dissolution when the fabric and the color master are added simultaneously in the prior art is effectively solved. Meanwhile, the addition amount of the color master is in a controllable state, and the produced wood-like grains are also in a controllable state naturally. By adopting the technical scheme, the color master batch effect can be furthest exerted, and the addition amount of products with the same color can be reduced, so that the cost is reduced; meanwhile, the structure of the wood grain control part can be further finely adjusted, the wood grain control part is suitable for color masterbatches with different melt indexes, and the limitation of the prior art on the use of the color masterbatches is effectively solved.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the entire production apparatus;
FIG. 2 is a schematic diagram of a wood grain control component.
Detailed Description
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as up, down, front, rear, left, right, etc., is the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of the description of the present invention, and does 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 thus, should not be construed as limiting the present invention.
In the description of the invention, the meaning of a plurality of the terms is one or more, the meaning of a plurality of the terms is two or more, and the terms larger, smaller, larger, etc. are understood to include no essential numbers, and the terms larger, smaller, etc. are understood to include essential numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the invention, unless otherwise explicitly defined, terms such as set, mounted, connected and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, the invention relates to a preparation method of a wood-like co-extrusion mixed color wood-plastic composite material.
The trapezoidal box in fig. 1 represents the feed hopper, and it can be seen that the fabric inlet is arranged at a position of the second extrusion section 2 remote from the co-extrusion module 4, substantially at the starting position of the second extrusion section 2; the color master inlet is arranged at the position of the second extrusion part 2 close to the co-extrusion module 4 and is basically positioned at the tail end of the second extrusion part 2, and only the fabric and the color master are required to be mixed at the position of the second extrusion part close to the co-extrusion module. When the color master is added at the position, the color master is usually in a fine granular shape, and because the melting points of the fabric and the color master are different, the raw materials are respectively input at different stages, and then the heating temperature is reasonably controlled, so that the raw materials and the color master can be easily controlled to be in different molten states just before reaching the co-extrusion module 4, and the texture of the prepared surface layer can be more uniform.
In order to achieve a better effect of imitating wood grains, the scheme of the application introduces a wood grain control component 9 on the basis, wherein the wood grain control component 9 is arranged between the second extrusion component 2 and the co-extrusion module 4, namely the wood grain control component 9 generates narrow gaps.
In the embodiment, the first extrusion part 1 adopts a conical double-screw extrusion main machine, and the second extrusion part 2 adopts a single-screw extruder, so that the continuous production capacity is high.
Specifically referring to fig. 2, the wood grain control member 9 includes a housing 91 and a kneading module 92 fixed inside the housing 91, and both the inside of the housing 91 and the kneading module 92 have a rotary structure. The head and the tail both ends of shell 91 are equipped with the flange, and shell 91 head and the tail both ends are extruded part 2 and are connected with crowded module 4 altogether with the second respectively, and mixing module 92 is close to the second and extrudes the front end of part 2 and be the structure of the narrow body width of head, and the entry of narrow slit narrows down from outside to inside gradually this moment, and the surface fabric can be squeezed the clearance all around by mixing module 92 behind the mixing module 92 with the mixed back contact of look mother, and the cross section in this clearance is the ring shape. The dotted line in fig. 2 indicates the flow path of the mixture. In the embodiment, the melting tank not only moderately plasticizes the color masterbatch to achieve the linear obvious wood grain effect, but also enables the color masterbatch to be uniformly distributed in the fabric.
Because of the low melting point of a typical color master, the color master has an opportunity to acquire enough heat to transform into a molten state by friction after being extruded into the gap between the compounding module 92 and the housing 91. However, the heating part is arranged on the shell 91, so that color masterbatch is more conveniently heated, and the production efficiency is improved.
Because the mixing module 92 can be fixed on the shell 91 only through the support 93, in order to reduce friction, the support 93 is set to be a narrow structure as much as possible, the length is also shortened as much as possible, and the periphery of the support 93 is rounded; the mixture is fluid and, although temporarily separated, eventually comes together.
In this embodiment, the heating element is an electric heating wire, the housing 91 is made of metal with good heat conductivity, and the mixing module 92 is made of solid metal, so that the electric heating wire is wound around the housing 91, which is very simple, and therefore, fig. 2 does not show the heating element; in order to protect the heating wire and accidental scald, a layer of heat insulation cotton can be wrapped on the outer shell 91. The heat pipe and the induction coil are arranged in a same way.
The front end of the mixing module 92 is hemispherical or conical, so that the resistance of the fabric and the color master to enter the gap is reduced. In figure 2 it can be seen that the front end of the mixing module 92 is slightly protruding. Correspondingly, the tail end of the mixing module 92 is provided with a chamfer, the size of the chamfer is larger, and a larger outlet is formed between the mixing module 92 and the shell 91, so that a subsequent mechanism can conveniently pull out a cylindrical mixture.
In other embodiments, the color concentrate is directly added to the color concentrate inlet. In this embodiment, the color masterbatch inlet is connected with the third extrusion part 3, accordingly, the third extrusion part 3 is a single-screw extruder, and the programmable color masterbatch metering conveyor is arranged at the input end of the third extrusion part 3, so that the addition amount of the color masterbatch can be accurately controlled, and the addition amount of the color masterbatch can be accurately controlled. The third extrusion part 3 is connected with a controller, and the controller controls the rotating speed of a motor of the third extrusion part 3, so that the purposes of automatically controlling the wood grain shade and the wood grain effect are achieved.
In this embodiment, the controller controls the motor speeds of the three screw extrusion hosts respectively, so as to control the overall processing speed. In fig. 1, it can be seen that the same side of the second pressing member is provided with a control panel 8 and a display screen of the controller, which are convenient for observation and control.
The screw barrel or the screw is partitioned according to different states of the injection molding material in the screw extruder main machine, and the temperature required to be noticed in the preparation process is described below.
For the first extrusion part 1, a double-screw extrusion main machine is adopted, and the overall heating temperature is 130-210 ℃. The device is divided into a first screw cylinder area, a second screw cylinder area, a third screw cylinder area, a fourth mixing module, a confluence core and a core layer die area according to the feeding and discharging sequence. The heating temperature of the first screw cylinder area is 170-210 ℃, the heating temperature of the second screw cylinder area is 160-200 ℃, the heating temperature of the third screw cylinder area is 140-170 ℃, the heating temperature of the four-area mixing module is 130-160 ℃, the heating temperature of the confluence core is 130-150 ℃, and the heating temperature of the core layer die area is 140-170 ℃; the rotation speed of the screw is 10-35 rpm. It can be seen that the raw mixture is first melted at a higher temperature and finally shaped and extruded at a stable lower temperature to the coextrusion block 4.
For the second extrusion part 2, a single-screw extrusion main machine is adopted, and the integral heating temperature is 100-200 ℃. The device is divided into a first screw cylinder area, a second screw cylinder area, a third screw cylinder area, a fourth mixing module, a fifth screw cylinder area and a surface layer die area according to the feeding and discharging sequence. The heating temperature of the first screw cylinder area is 100-160 ℃, the heating temperature of the second screw cylinder area is 150-190 ℃, the heating temperature of the third screw cylinder area is 160-200 ℃, the heating temperature of the fourth mixing module area is 140-190 ℃, the heating temperature of the fifth screw cylinder area is 140-190 ℃, and the heating temperature of the surface layer die area is 160-200 ℃; the rotation speed of the screw is 10-35 rpm.
The third extrusion part 3 does not need to be heated, and the rotating speed of a screw is 1-10 rpm. The color concentrate is mixed with the fabric and then properly melted, and then properly heated in the mixing module 92.
Of course, the design creation is not limited to the above embodiments, and the combination of different features of the above embodiments can also achieve good effects. Those skilled in the art can make equivalent changes or substitutions without departing from the spirit of the present invention, and such equivalent changes or substitutions are included in the scope defined by the claims of the present application.
Claims (10)
1. The preparation method of the wood-like co-extrusion color-mixing wood-plastic composite material comprises a first extrusion part, a second extrusion part and a co-extrusion module which are communicated with each other, wherein the output ends of the first extrusion part and the second extrusion part are respectively connected with two input ends of the co-extrusion module, and the preparation method is characterized by comprising the following steps of:
the first part of extruding outputs combined material raw material mixture toward the module of coextruding, meanwhile, extrude the part at the second and keep away from the one end of coextruding the module and drop into the surface fabric, extrude the part at the second and be close to the one end of coextruding the module and drop into the masterbatch, surface fabric and masterbatch extrude the position that the part is close to the module of coextruding at the second and mix, then surface fabric and masterbatch pass the slim slot of cross section and form lamellar body structure, at last in the module of coextruding cladding combined material mixture, the module output section bar of coextruding, wherein, the masterbatch is in the molten state before reaching the module of coex.
2. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material according to claim 1, characterized in that: the fabric is heated to a molten state when the second extrusion part is put into the fabric, and the color master keeps granular or powdery when the second extrusion part is put into the fabric.
3. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material as claimed in claim 2, wherein the steps of: the second extrusion part is provided with a third extrusion part, color master is firstly put into the third extrusion part and then is sent into the second extrusion part through the third extrusion part, and the third extrusion part is connected with a controller to control the adding amount of the color master.
4. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material as claimed in claim 3, wherein the steps of: the first extrusion part, the second extrusion part and the third extrusion part are all screw extruders and are all connected with the controller, and the controller respectively controls the motor rotating speed of the three extrusion parts so as to adjust the quantity of materials entering the co-extrusion module.
5. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material according to claim 1, characterized in that: the heating temperature in the first extrusion part is 130-210 ℃, and the heating temperature in the second extrusion part is 100-200 ℃.
6. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material as claimed in claim 5, wherein the steps of:
the first extrusion part is divided by a double-screw extrusion main machine according to a feeding and discharging sequence, the heating temperature of a first screw cylinder area is 170-210 ℃, the heating temperature of a second screw cylinder area is 160-200 ℃, the heating temperature of a third screw cylinder area is 140-170 ℃, the heating temperature of a fourth area mixing module is 130-160 ℃, the heating temperature of a confluence core is 130-150 ℃, and the heating temperature of a core layer die area is 140-170 ℃;
the second extrusion part adopts a single-screw extrusion main machine and is divided according to the feeding and discharging sequence, the heating temperature of the first screw cylinder area is 100-160 ℃, the heating temperature of the second screw cylinder area is 150-190 ℃, the heating temperature of the third screw cylinder area is 160-200 ℃, the heating temperature of the four-area mixing module is 140-190 ℃, the heating temperature of the fifth screw cylinder area is 140-190 ℃, and the heating temperature of the surface layer die area is 160-200 ℃.
7. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material according to claim 1, characterized in that: the fabric and the color master are heated when passing through the narrow slit, so that the fabric and the color master are kept in a molten state.
8. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material as claimed in claim 7, wherein the steps of: the inlet of the narrow slit is gradually narrowed from the outside to the inside.
9. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material according to claim 8, characterized in that: the narrow slit is circular, and the fabric and the color master after passing through the narrow slit form a cylinder shape.
10. The preparation method of the wood-like co-extrusion mixed-color wood-plastic composite material as claimed in claim 9, wherein the steps of: the mixing device comprises a shell with a transparent head and a transparent tail and a mixing module fixed in the shell, wherein a heating part is arranged on the outer side of the shell, a gap is formed between the shell and the mixing module, and the gap forms the narrow gap.
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| CN105348702A (en) * | 2015-12-15 | 2016-02-24 | 辽宁程威塑料型材有限公司 | Imitation wood striped plastic profile with clear textures and production process thereof |
| CN105860318A (en) * | 2015-12-22 | 2016-08-17 | 北京化工大学 | A co-extruded double-foaming polymer composite material floor and a processing method thereof |
| CN106827707A (en) * | 2016-12-30 | 2017-06-13 | 宁波禾隆新材料股份有限公司 | A kind of imitation wood wood-plastic co-extrusion section bar and preparation method thereof |
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