KR101439331B1 - Wood plastic composite and Manufacturing system which have plural injection hoppers and multistage extruding screws - Google Patents

Abstract

A primary charging unit 100 for charging a polyolefin-based polymer resin such as PP or PE resin, a binder, and a color material; A secondary mixing unit 200 for injecting the wood powder and mixing the powder with the input materials of the primary charging unit 100; A third mixer 300 for modifying the synthetic wood surface by adding a small amount of wood powder around the wood fiber to the material passed through the secondary mixer 200; A gas-liquid discharging unit 400 for discharging gas and moisture generated from the molten raw material; And a transfer extrusion cylinder 600 for extruding and transporting the mixture of the polymer resin, wood powder, color material and binder mixed and melted and a transfer extrusion cylinder 700 surrounding the transfer extrusion screw 600, A device and a synthetic wood produced using the same are disclosed.
The synthetic wood manufacturing apparatus of the present invention can directly inject powdered wood powder not subjected to the palletization process by means of the forced injection screws 213 and 313 so that the existing double process can be simplified to a single process, Manufactured by an intermediate cooling step in which a wood fiber component consisting of two or more natural fibers is further added from bamboo fiber such as bamboo fiber, coconut fiber and palm fiber cut into an arbitrary length of 2 to 10 mm in length The present invention has the advantage of improving the surface tension and the rigidity of the product by increasing the adhesiveness of the wood powder and the resin due to the stable and uniform kneading.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a synthetic wood produced by a plurality of wood powder input portions and a multi-stage extrusion screw,

TECHNICAL FIELD The present invention relates to a method for producing synthetic wood by molding and melt-kneading a polyolefin-based resin and various additives in wood powder, and to a manufacturing apparatus for the same, and also relates to a synthetic wood which is manufactured to have improved performance through the above- .

Synthetic wood manufacturing technology, which is made by adding polyolefin resin in powder form to wood powder and solidifying it by hot pressing, has a long history and a great variety of technologies related to this have been disclosed to the general public.

The following prior art document (1) relates to a typical synthetic wood manufacturing method. Specifically, the cellulose wood powder is melted and mixed at a temperature of 140 to 150 ° C. in an amount of 10 to 100 parts by weight based on 100 parts by weight of the polyolefin resin, 0.5 to 5 parts by weight of azodicarbonamide and 0.5 to 2 parts by weight of zinc oxide are added Introducing a method of manufacturing a foamed plastic synthetic wood which produces a molten mixture of a polyolefin resin and a cellulose-based wood powder.

As a further improved synthetic wood manufacturing method, there is Document (2). The reference (2) is a method for lowering the manufacturing cost by utilizing waste synthetic resin material, and it comprises an outer layer formed by mixing wood and a synthetic resin, wood powder mixed in a recycled synthetic resin material and extruded into the outer layer, And a long fiber bundle is continuously arranged in the inside of the inner layer, and the structural strength of the inner layer is maintained at a low cost while maintaining the appearance quality.

Optimization of wood powder added to synthetic wood (wood powder) is also actively being made. (3) using wood flour of bamboo for the purpose of expressing high strength, light weight and natural wood texture comprises 45 to 65% by weight of cellulose fiber produced from bamboo wood powder, 20 to 40% by weight of HDPE resin, , 10 to 20% by weight of an auxiliary material containing at least one of an antistatic agent, a plasticizer, a filler, an antioxidant, a colorant, a lubricant, a heat stabilizer and an antimicrobial agent. In addition, bamboo wood powder is treated with carbon disulfide to have lignin and wax as cellulose fibers having a length of 4 mm or less.

Improvements to the addition of polyolefin-based synthetic resins (PP, PE, etc.), which play a key role in the kneading of wood flour (= even mixing) and hardening, have been continuously attempted.

Reference 4 shows that the use of polyethylene (PE) resin as a resin for adding wood powder and addition of a UV stabilizer improves chemical resistance, weather resistance, abrasion resistance and tensile strength.

Several changes have been made to the synthesis process between wood and plastic resin, and one of them is described in the literature (5). Document (5) introduces a modified kneading melt process in which wood and plastic resin are mixed once, then dried to remove moisture, and the dried synthetic wood material is melted again and injection molded into a mold.

Techniques for preventing the deterioration of physical properties due to changes in moisture content in the process of kneading wood and synthetic resin have also been introduced. Reference 6 refers to wood flour and a polyolefin resin having a water content exceeding 0.5% in the process of mixing a starting material containing wood and a polyolefin resin, wherein an alkaline earth metal equivalent to 0.3 to 0.5 wt% Is added as a compatibilizer (compatibilizer). According to document (6), even if the moisture content of wood flour is changed somewhat, the properties of the finished synthetic wood such as the flexural strength are less deteriorated and the extrusion production speed is improved.

(1) Korean Patent Registration No. 10-0636427 Method for manufacturing synthetic wood and synthetic wood produced thereby (2) Korean Registered Patent No. 10-1008838 Synthetic wood and manufacturing method thereof (3) Korean Patent Registration No. 10-1062659 Composite material for synthetic wood containing bamboo wood powder, method for producing the same, and synthetic wood produced using the same (4) Korean Patent No. 10-1030425 Method for manufacturing synthetic wood (5) Korean Patent Laid-Open No. 10-2012-0050140 Method for producing synthetic wood (6) Korean Patent Registration No. 10-1175308 Composition for wood-plastic composite material and wood-plastic composite material manufactured using the composition

The technology development direction of synthetic wood is largely divided into a low price technology which improves the timing and addition method of waste wood, a mechanical property improvement technology which improves pressure ratio and temperature in the ratio of addition of polyolefin resin for kneading molding, And advanced technology that improves the quality sense, such as surface finishing of synthetic wood.

Each of these technical effects has a detrimental effect on other areas. For example, as the ratio of waste wood is increased, the bondability and texture compactness are lowered, which leads to a deterioration of the mechanical properties of the finished synthetic wood.

The finishing technique of increasing the ratio of synthetic resin to the surface layer part leads to an increase in the manufacturing cost by lowering the ratio of the whole wood powder, especially the waste wood. In contrast, the finishing technique of raising the neck texture to the surface layer not only lowers the mechanical strength but also increases the adhesion There is a disadvantage that it easily peels off.

As mentioned above, the manufacturing technology of synthetic wood has a tendency to damage the other side in pursuit of either side. In recent years, however, the use of alternative resources such as waste wood and bamboo wood was maintained, Development of high-quality, high-quality, high-performance, eco-friendly materials is being developed rather than low-priced products.

The main object of the present invention is to provide an improved method of kneading, melting and extruding, which improves and improves the kneading properties of bamboo wood chips and polyolefins through the improvement of processes and equipment and the introduction of suitable compatibilizers, Thereby providing a significantly improved synthetic wood.

Concretely, composite materials for synthetic wood, which are wood substitute materials for building materials and agricultural materials, which contain more than 75% of wood fiber to achieve wood texture, and which perform blending, kneading and extrusion processes and improve mechanical properties such as heat stability, A process for melting and pressurizing a mixed resin mixed with a polymer resin at a predetermined temperature by incorporating a wood fiber fraction dried to less than 3% moisture, a cut antimicrobial fiber and an excessive amount of natural wood bristles, To provide a manufacturing method which is excellent in mechanical properties and prevents the wood fiber from being deteriorated by moisture and enhances heat resistance and durability.

In the case of waste wood, it is applied to various types of panels by combining with thermoplastic polymer resin by crushing or pulverizing. However, despite the advantage of preventing environmental pollution due to loss of waste, the problem of physical properties such as strength, texture and value added There is a problem in the commercialization stage for related products.

In order to solve these problems, various studies and experiments have been conducted. However, it is difficult to select a free additive due to the lack of practical techniques and the peculiarity of the related industries to increase the mechanical properties of the thermoplastic polymer resin.

It is known that a composite material in which inorganic fibers are dispersed in a polymer resin in a size of ㎜ improves the mechanical properties of polymers such as rigidity, abrasion resistance, and heat resistance.

Conventional production processes for producing synthetic wood include a raw material processing apparatus for primary processing raw materials and a profile extruding method for processing the processed pallet through an extrusion apparatus .

Here, the primary raw material processing apparatus is a plastic raw material. Wood flour. And then various additives are combined and then melted and concentrated to produce a raw material processed into a pallet shape. The secondary processing device refers to a device for finally extruding a desired shape of a shape by injecting the raw material of the pallet.

That is, since the conventional process for producing synthetic wood requires passing through the two-stage apparatus as described above, there is a problem that the manufacturing cost is increased due to the increase of initial facility investment cost and manufacturing cost.

Although the claims of the present invention distinguish the category of invention from the method of manufacturing synthetic wood and its products, or the manufacturing apparatus and its products, the contents of the rights backed up through the detailed description and drawings of the present invention are substantially the same as those of manufacturing method And the manufacturing apparatus and the products thereof are closely related to each other.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And design, which are in accordance with the detailed description and drawings set forth below.

The method and apparatus for manufacturing synthetic wood according to the present invention have a very excellent effect of reducing the manufacturing cost by simplifying the production process by the existing two-step process in one step.

In addition, the product of the present invention produced by the intermediate cooling step has a high adhesiveness due to uniform mixing of wood and resin in the manufacturing process which is followed by mixing, kneading and melting of the plastic raw material and wood powder, thereby improving the surface tension and rigidity of the product .

Further, the present invention can easily change the ratio of the plastic raw material and the wood powder during the production according to the use and characteristics of the product in the aspect of the production method, , It is possible to easily replace the screw cylinder with the long shaft type at a low cost in the case of screw abrasion by replacing the screw cylinder of the integral screw type into the divided type assembled type. In addition, the small sized screw can be made of special steel which is resistant to abrasion, which can increase the replacement cycle of screw and screw cylinder.

1A and 1B are photographs of various types of wood, a polymer resin pellet and a binder, respectively
Fig. 2 is an overall flowchart of a method for producing synthetic wood according to the present invention
Figs. 3A to 3C show experimental results of the synthetic wood according to the present invention
Fig. 4 is an overall structural view of a synthetic wood manufacturing apparatus according to the present invention. Fig.
FIG. 5 is a schematic diagram of a primary injection part according to the present invention
6A to 6C are schematic views showing the configuration of the second and third mixing parts according to the present invention,
Fig. 7 is a schematic view showing the configuration of the gas-
Fig. 8 is a schematic diagram of the conveying extrusion screw and the conveying extrusion cylinder

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: FIG.

It should be understood, however, that the invention is not limited to the specific embodiments thereof, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

First, the components and blending ratios of the synthetic wood which are the basis of the technical idea of the present invention will be explained.

Wood flour, which accounts for the largest portion of the synthetic wood component, can be divided into a wood flour in small powder form and a wood fiber in fiber form. Wood flour is made of waste wood or squat wood treated with crushed powder at a particle size of 2 mm or less, that is, 30 to 50 mesh, bamboo fiber cut at a length of 2 to 10 mm, coconut fiber, In the form fiber, the wood fiber component consisting of two or more natural fibers is dried to a moisture content of less than 3% and then added in an amount of 70 to 80% by weight of the total synthetic wood.

FIG. 1A is a photograph of wood particles of various sizes ranging from fine powder-form wood powder to cellulosic fiber-form wood powder.

The components and the compounding ratio of the synthetic resin and additives added to the preceding stage of the wood powder will be described.

Polymeric compounds resulting from the polymerization of polyolefins (chain-like hydrocarbon compounds with double bonds) are among the lightest plastics and have excellent transparency, which does not compromise the color of wood flour. Polyolefins that can be polymerized freely are only olefins (or a-olefins) with double bonds at the ends, so polyethylene, polypropylene, polyisobutylene (a product made by copolymerizing with a small amount of isoprene as a synthetic rubber) belongs to the polyolefin Particularly, the polymer of 4-methylpentene synthesized from propylene exhibits excellent properties as polymethylpentene and metelpentene resin.

1B is a photograph of a polymer resin pellet and a binder in powder form, respectively.

The polyolefin resin to be added to the synthetic wood according to the present invention can be used as a matrix material capable of being extruded, and a recycled resin may be used depending on the function of the final product. Specific examples thereof include low density linear polyethylene, low density polyethylene, high density polyethylene, Either one or two or more can be used.

For example, in the case of polypropylene, polypropylene having a melt flow index of 10 g / min is used as a polymer matrix, and polypropylene resin is preferably used in a synthetic wood having a high strength.

The specific addition rate is defined as the weight of the entire synthetic wood component, Polypropylene, a binder which is two or more adhesive resins, and three or more additives are added in an amount of about 20 to 30% by weight.

When high strength properties are required, it is preferable to use block polypropylene having an ethylene content of 5 to 10%. When flexible properties are required, block polypropylene and low density polyethylene are mixed in a weight ratio of 6: 4 to 9: 1 .

On the other hand, polyethylene (hereinafter abbreviated as PE) and polypropylene (abbreviated as PP hereinafter) are semi-crystalline polymer resins that are lightweight, have low water absorption, and are excellent in chemical resistance and molding processability and are widely used in various fields. However, PE and PP do not contain any polar groups in the main chain, and they have a low bonding strength with hydrophilic wood.

Since the low bonding strength between the PE and the PP resin and the wood fiber leads to deterioration of the physical properties of the product, a technical method for improving the bonding force between the wood fiber and the polymer resin by improving the interfacial bonding strength should be sought in order to produce excellent synthetic wood.

The binder used in the present invention, including compatibilizing agents (meaning a compatibilizer or a binder in the present invention), is a combination of two or more adhesive coupling agents for binding PP and PE resins, and three or more different Additives with functional properties are used.

For the compatibilizer to improve the compatibility of the matrix of PP and PE resin, for example, the product CM-1120w of Honam Petrochemical was used and the melt tension and elastic modulus of the product. In order to increase the heat distortion rate, A-3000 which is a processing material of heat-resistant material of Mitsubishi Rayon of Japan can be used.

Further, LICA.38 available from Kenris Co. of USA can be used as a binder for prevention of carbonization of wood fiber, improvement of workability and improvement of physical properties.

The binders have different functions in order to cope with the phenomenon that occurs when the excessive wood powder is added in an amount of 70 wt% or more, and the increase of the binding force greatly affects the physical properties of the product.

Briefly summarized, the above-mentioned entire constituents are summarized as follows. A wood-based powder having a surface of 2 mm or less and a dried wood-based powder of 2 mm to 10 mm in length is mixed with 70 to 80% by weight of wood powder, and a polyolefin- Of 13 to 23% by weight, and contains 7% by weight of a binder and an additive including a compatibilizer.

As will be described later through the production method, the components of the synthetic wood according to the present invention are not differentiated from the prior art only by their composition and the mixing ratios themselves. Rather than using the manufacturing method and the manufacturing apparatus described below, It is possible to have a mixing ratio at the time of injection and in a stepwise manner and to have a more efficient physical property at the same manufacturing cost. Therefore, the synthetic wood of the present invention should be clearly specified by the manufacturing method or the manufacturing apparatus described below as well as including its constituent components.

Next, the technical characteristics of the synthetic wood manufacturing method of the present invention based on the synthetic wood component and the blending ratio will be described.

First, in order to increase the mixing property, the conventional manufacturing method is a two-step process in which wood powder is first molded into a pallet shape and then put into a pushing screw together with a polyolefin resin to melt and melt the product to form a product. Instead of palletizing palletizing process of wood powder, it is possible to overcome the difficulty of material blending and to improve the cooling effect in the melting process It is characteristic of the devised.

The important manufacturing process parameters in all kinds of synthetic wood including the present invention are the contents of wood flour at a total weight ratio. Here, the content of wood powder needs to be adjusted in accordance with the component characteristics of the compatibilizer. In addition, it is important to optimize the conditions applied to each process such as the working temperature of the compounding step and the molding step, the residence time and temperature in the extrusion molding device, and the like to the component characteristics.

The manufacturing method of the present invention largely consists of two steps A and B. The manufacturing method of the present invention will be described step by step with reference to FIG.

First, step A comprises 70 to 80% by weight of wood powder, 2 to 10 mm long wood fibers and 13 to 23% by weight of a polymer resin, modified wood particles whose surface is modified and dried to a moisture content of 3% And 7% by weight of the additive were respectively uniformly stirred, and then put into the transfer extruding cylinder and melt-melted by the transfer extrusion screw.

More specifically, 4% by weight of binder [1] CM-1120w and 4% by weight of binder [2] L / 38H were added to 70 to 80% by weight of wood flour containing wood flour and wood fiber as described in the above- (Preferably 17% by weight) of a polyolefin resin selected from low-density PE.PP or high-density PE.PP is added in an amount of 0.7 to 0.7% by weight, a binder [3] A-3000 of 0.8% And further adding or adding one or more functional additives to the product depending on the characteristics thereof.

In this case, wood flour (wood flour and wood fiber flour) should be removed after moisture is removed by less than 3% through a drying device to prevent durability deterioration caused by macroscopicity and texture failure on the product surface.

Further, the wood powder may be added by reducing it by 5 to 10% by weight for the B step.

Next, in step B, 5 to 10% by weight of dried wood powder is added to the inside of the conveying extruding cylinder space during the melt-melting by way of the step A, followed by mixing and melting.

In this case, the wood powder to be input in step B is preferably limited to the wood fiber as much as possible in order to prevent agglomeration.

The wood powder to be input in step B, specifically wood fiber, lowers the temperature of about 10 to 20 ° C at a temperature of 160 ° C to 170 ° C, which is a general extrusion molding step followed by step A.

As a result, the final melt-kneading proceeds at about 140 ° C to 150 ° C, thereby preventing the carbonization that may occur when the wood fibers are overpowered from the beginning.

That is, the multistage dispersion of wood powder, which is a core technical idea of the present invention, achieves the main technical objective of increasing the wood fiber content and prevents the carbonization of the excessive wood fiber and ensures stable dispersion in the finished product synthetic wood A remarkable improvement in terms of bending strength and thermal stability can be expected.

FIG. 3 shows experimental results showing the excellent physical properties of the synthetic wood according to the present invention produced through the above-mentioned components and the production method.

As will be described later through the manufacturing apparatus, the method of manufacturing the synthetic wood according to the present invention is not differentiated from the prior art by only the input timing and the input ratio itself, but rather, And can be prevented from being carbonized and has high moldability, and is characterized in that it has more efficient physical properties in an equivalent production method. Therefore, the manufacturing method of the present invention must be clearly specified by the manufacturing apparatus described below as well as including the input timing and the input ratio.

Finally, technical features of the synthetic wood manufacturing apparatus of the present invention in which the synthetic wood and the manufacturing method thereof are implemented in a series of continuous extrusion forms will be described.

The method of manufacturing the synthetic wood according to the present invention has a process step of mixing the primary mixed plastic raw material and the wood powder and a final step of molding the raw material mixed with the synthetic wood into one continuous process and the process equipment. The basic design intent of the manufacturing apparatus is to increase the mixing and mixing of widely used plastic raw materials such as wood-based cellulose fibers and polyolefin-based polymer resins such as polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC) And to improve the synthetic wood surface by increasing the wood grain content.

Referring to FIG. 4, the manufacturing apparatus of the present invention will be described generally. A first input unit 100 for inputting a polyolefin resin such as PP, PE resin, a binder and a color material, A third mixing part 300 for modifying the synthetic wood surface by additionally feeding a small amount of wood powder around the wood fiber to the material passed through the secondary mixing part 300, Liquid feedstock, coloring materials, and coloring materials are mixed and conveyed through a gas-liquid discharging unit 400 for discharging gas and water in the conveying and extruding cylinder 700 through the conveying and extruding screw 600, It is characterized in that it is formed into a desired shape and quantity while being metered and transported.

The supporting part 500 functions to support the above-mentioned components as a whole, and the supporting part 500 extends from the first feeding part 100 to the conveying and extruding screws 600 to be described later and the conveying and extruding cylinder 700 And overall support.

The first input unit 100 will be described in detail with reference to FIG. The first charging part 100 is charged with a plastic resin, a color material and a binder material corresponding to 20% to 30% of the entire charging amount and performs a kneading and conveying function. As shown in FIG. 3, The raw material is supplied by using the dispenser.

The resin and binder injector 110, which plays a key role in the primary injecting section 100, is used to inject raw materials such as resins and binders into the transfer extrusion cylinder 700. As shown in FIG. 5, A forced injection screw 113 in the form of a spiral which feeds the raw material stored in the feed pipe 111 at a constant rate and at a constant speed.

Since the amount of the raw material is determined according to the number of revolutions of the forced insertion screw 113 and the injection pressure is determined, the resin and the binder injector 110 can maintain the consistency of production by data of the amount of the raw material input for each different molded article.

Meanwhile, a color material dispenser 120 is additionally arranged in the first charging part 100.

The color material dispenser 120 is a device for finely introducing various types of colors (maypol, cherry, walnut, etc.). Usually, the color material is a fine powder and a concentrated form of pallet. Therefore, the two types of raw materials can be used at once, and the cleaning can be easily performed even when raw materials having different colors are used.

Hereinafter, the secondary mixing unit 200 and the tertiary mixing unit 300 will be described in detail with reference to FIGS. 6A and 6B.

The secondary mixing part 200 is a hollow part for mixing and kneading the wood powder with the polymer resin or the like transferred from the primary input part 100 while supplying the wood powder with a predetermined amount and supplying the wood powder and the wood fiber as described above have.

Also, the third mixing unit 300 has a structure similar to the second mixing unit, and the difference from the second mixing unit is that a better effect can be obtained when the input wood becomes the wood fiber rather than the wood.

5, the primary wood powder dispenser 210 applied to the secondary mixer 200 includes a hopper 211 for storing a predetermined amount of wood powder, a stirring blade 212 disposed inside the hopper, And a low-speed rotation motor 214 for driving the forced-insertion screw 213. The forced-insertion screw 213 is installed in the hopper for forcibly transferring the molten metal to the metal mold. This structure and arrangement is the same in the second wood powder dispenser 310, and the structural aspects thereof are very similar except for only the first digit of the reference numerals, and the second to third mixing parts are very similar and the characteristics of the input materials are different.

If a bridge occurs in the hopper due to the weight of the wood, the supply of wood meal may not be smooth. The agitating blades 212 and 312 serve to prevent this phenomenon.

The motors 214 and 314 for driving the forced insertion screws 213 and 313 are capable of controlling the speed at low speed. In addition, the product should be able to adjust the input ratio according to the application.

The raw materials including wood powder have an average of 160 ° C to 170 ° C / 6 minutes (when passed through a screw (L / D 3m length) installed inside the extrusion molding machine, And the wood fiber: commercial fire content was 75% by weight: 7% by weight.

Batch volume of hopper with agitating function is 250 kg capacity. Mixing Tools are separately manufactured in sickle shape 3-stage tool form, preventing accumulation of wood fiber and mixing and dispersion of various additives Hot-mixing / Cold-mixing As a Combi mixer, mix and mix in a hot mixer and move to a cold mixer when the torque value of the main motor rises (145 ℃). Cooling process at 40 ~ 50 ℃ is the best synthetic wood compound with 75% Materials can be developed.

The process of dispersing and kneading the thus-blended mixture is also one of the most important manufacturing processes. The difficulty in the process is that, for example, the capacity of the mixing device is too large to be larger than the volume of the mixing device due to the volume of the excessively contained wood fiber, so that the shape of the blades of the stirring blades mounted inside the blender must be designed differently . FIG. 6C is a photograph illustrating the shape difference of different stirring blades according to the polymer resin and wood powder. FIG.

In this type of mixing machine, materials with different shape and specific gravity are dispersed uniformly for about 13 to 14 minutes. In this case, the phenomenon of sticking the homogeneously dispersed material together with the melting reaction of the thermoplastic resin, polyolefin resin The load phenomenon starts to occur in the main rotating and rotating drive motor unit together.

Hereinafter, the gas-liquid discharge unit 400 will be described based on FIG.

The raw material that has passed through the second to third mixing part is completely melted and melted in the plastic raw material and the wood powder, and moisture and gas generated while passing through the gas liquid discharging part 400 are discharged. It is also often called a vent, and performs functions that enable natural discharge and mechanically forced discharge.

Hereinafter, the conveyance extrusion screw 600 and the conveyance extrusion cylinder 700 will be described in detail with reference to FIG.

As described above, the transfer extrusion cylinder 700 includes a first inlet 710 for communicating with the first charging portion 100 into which the plastic raw material and the color material are charged, a second inlet 710 connected to the second charging portion 200, Liquid inlet ports 720 to 721 and a gas-liquid outlet port 730 communicating with the gas-liquid discharge section 400 are formed. The tube is divided into cylinders not integral with each other, and a conveying extrusion screw 600).

The built-in conveying extrusion screw 600 is set in a different wing shape for each stage to perform individual functions. The material is rotated by an external motor, mixed with each step, mixed and melted, passed through a conveying extrusion cylinder Thereby forming a molding process.

The transfer extrusion cylinder 700 is a space in which a function of repeatedly performing quantitative transfer, mixing, kneading, and melting functions is performed, and the transfer extrusion screw 600 mounted inside the transfer extrusion cylinder 600 substantially performs the above function. For this purpose, a heat source or a heating device for generating heat may be provided outside the cylinder. Such a device is not shown in the drawing, but may be operated under the control of a control unit implemented by a conventional technique.

In order to cope with premature wear of the inside of the screw cylinder caused by injection of wood powder (60% ~ 80%) into the conveying extrusion cylinder 700, the conventional long shaft type integrated type is designed to be assembled and divided, It is possible to extend the replacement period by using special steel which is resistant to abrasion.

The conveyance extrusion screw 600 will be described. Since the conveying extrusion cylinder 700 is designed to be changed from an integral screw cylinder of a long axis type to an assembly type of a split type, the screw of the present invention can be easily replaced at low cost at the time of abrasion. In addition, as in the case of cylinders, small-sized screws can be made of special steel that is resistant to abrasion, thereby increasing the replacement cycle of the screw and the screw cylinder.

As described above, the forced injection screws 113, 213, and 313 disposed in the primary injection section 100 from the primary injection section 100 to the tertiary mixing section 300 serve to mix and transport the raw materials into the spiral grooves, The size of the helical groove to be applied is also acceptable and it is advantageous that the groove depth is as low as possible.

However, the shape of the helical groove of the conveying extrusion screw 600 is formed deep and wide only in the first section of the first inlet 710, and in the remaining sections of the second inlet to the gas-liquid outlet 720-721-730, It turns into a deep and wide spiral groove. This is largely different from the uniform low and narrow spiral groove shape of the forced insertion screws 113, 213, and 313 mounted in the respective hoppers, and is one of the greatest technical features of the present invention.

The transfer extrusion cylinder 700 will be described in detail by section. More than 70% by weight of the total amount of wood powder is put into the second inlet 720, and the wood powder is mixed with the polymer resin color raw materials passed through the first inlet 710 and is firstly compressed.

In the section where the second inlet 720 is located, the compressed raw material is completely melted and melted at a high temperature (160 to 200 degrees) in a short time. At this time, the feed extrusion screw 600 of each section is cut at regular intervals so that the entanglement of the raw materials can be induced and the mixing property of the raw materials is maximized.

When the raw material is transferred to the cylinder section where the third inlet (721) is located, the remaining 30% of the total amount of the wood powder is re-injected at the third inlet. At this time, the depth and width of the screw groove are preferably about 80% of the second mixing portion, and the melting temperature is kept as low as possible within the range of 140-180 ° C.

Preferably, as described in the above-mentioned production method, the wood powder to be additionally added in the entire raw material weight ratio is preferably put into the wood fiber, and the ratio may be 5 to 10% by weight. Further, the melting temperature of the mixing portion is preferably in the range of 140 ° C to 150 ° C, which is naturally lowered by about 10 to 20 ° C due to wood powder (wood fiber) added at 160 ° C to 170 ° C in the first section.

As described above, the raw materials of the first and second woods are completely melted and kneaded, and the gas and water are completely discharged through the gas-liquid outlet port 730, and then the reduced pressure is transferred and finally molded in the metering unit 800.

In the gas-liquid discharging part 400, the screw vanes are cut at regular intervals to entangle the completely mixed raw materials, thereby obtaining the maximum interfacial adhesion force and transferring a certain amount of raw material to the forming part at a constant pressure.

On the other hand, in order to optimize the kneading and molten state of the wood powder (wood fiber) contained in excess, and to supplement the operation conditions of the low speed operation when the polymer resin is used, the feed extrusion screw 600 of the present invention has a length / L / D = 22: 1 to L / D = 29: 1.

The synthetic wood manufacturing apparatus of the present invention is characterized in that in order to obtain an excellent finished molded product from a mixed material subjected to a mixing process, the internal heat accumulation due to the high temperature inside the cylinder during melting, pressurizing and kneading in a high- Unlike the conventional manufacturing apparatus for forced cooling from the outside in order to prevent the phenomenon from occurring, the method of feeding 5 to 10% by weight of the wood fiber in the relatively low temperature state at the secondary inlet to lower the overheating period heat resistance to improve the physical properties And the final synthetic wood product prevents the whole carbonization of the wood powder and the density of the wood fiber in the surface layer is higher than the density of the wood fiber in the inner layer, resulting in a natural surface texture of natural wood fiber.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

In other words, those skilled in the art will recognize that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. For example, And the scope of the technical idea of the present invention expressed by the following claims is also included.

The method and apparatus for producing synthetic wood described in the present invention can be used not only as a wood fiber having no economical efficiency such as wood pulp, but also as a palm fiber and palm fiber of bamboo fiber in tropical forests. Therefore, Textures, etc., can have a wide impact on the development of related markets in Korea and abroad.

100: primary input unit
200: Secondary mixing section
300: Third mixing section
400: gas-liquid discharge portion
500: Support
600: Feeding extrusion screw
700: Feed Extrusion Cylinder
800:
110: Resin and binder dispenser
120: color material feeder
111,211,311: Hopper
212, 312:
113,213,313: Forced insertion screw
214,
710: Primary inlet
720: Secondary inlet
721: Third slot
730: gas-liquid outlet

Claims (6)

delete A primary charging unit 100 for charging a polyolefin-based polymer resin such as PP or PE resin, a binder, and a color material;
A secondary mixing unit 200 for injecting the wood powder and mixing the powder with the input materials of the primary charging unit 100;
A tertiary mixing part 300 for adding wood powder to the material passed through the secondary mixing part 200 to modify the synthetic wood surface;
A gas-liquid discharging part 400 for discharging gas and water generated from the molten raw material;
A transfer extrusion screw 600 for extrusion-transferring the mixture of the polymer resin, wood powder, color material, and binder mixed and melted; And
And a transfer extrusion cylinder 700 surrounding the transfer extrusion screw 600,
The primary charging unit 100 is a system in which 13 to 23% by weight of the polymer resin stored in the hopper 111, 7% by weight of the binder and the additive are charged by a forced charging screw 113 at a constant rate, 110)
The secondary mixer 200 includes a primary wood powder injector 210 for supplying 70 to 80% by weight of wood powder dried at a moisture content of 3% or less stored in the hopper 211 by a forced charging screw 213 at a constant rate, ),
The tertiary mixer 300 is a wood powder stored in the hopper 311 and is mainly composed of bamboo fiber, coconut fiber and palm fiber which are dried to a moisture content of 3% or less and cut to a length of 2 mm to 10 mm, And a second wood powder dispenser (310) for additionally feeding 5 to 10% by weight of the wood pulp at a constant rate by a forced injection screw (313). 3. The method of claim 2,
The kneading and melting temperature of the secondary mixing part 200 is set in a range of 160 ° C to 170 ° C and the kneading and melting temperature of the tertiary mixing part 300 is set to 140 Lt; RTI ID = 0.0 > 150 C. < / RTI > The method of claim 3,
The conveying extrusion screw 600 and the conveying extrusion cylinder 700 are designed to be assembled in a divided form,
The shape of the spiral groove of the conveying extrusion screw 600 is formed deeply and broadly only in a section of the first inlet 710 which is the first section, and in the remaining sections of the second inlet to the gas-liquid outlet 720-721-730, Wherein the spiral groove is formed so as to be changed into a deep and wide spiral groove. A synthetic wood produced using the production apparatus according to any one of claims 2 to 4. 6. The method of claim 5,
Wherein the synthetic wood has a wood fiber density of the surface layer higher than a wood fiber density of the wood fiber of the inner layer.

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