KR100356536B1 - Wood Polymer Composite from Layer upon Layer Manufacture - Google Patents

Abstract

The present invention relates to a wood flour, a resin composite laminated plywood manufacturing method, an advantage of being able to significantly improve the water-tightness and strength as a substitute for wood plywood used for formwork, interior and exterior partition materials, furniture materials, etc. In addition, it can be produced at a low price, so it can secure competitiveness and diversify the appearance, eliminating the need for separate exterior treatment.

The present invention is a wood flour and resin composite laminated plywood to treat the surface layer on both sides and the lower surface with a synthetic paper layer, the center portion is a fusion of wood powder and waste plastic resin is lighter than the resin plywood and is a composition that satisfies the maintenance of water and water tightness at the same time.

Existing plywood lacks water resistance as a combination of water and water-soluble bonds, so it easily swells and separates when absorbing moisture. In addition, plywood made only of synthetic resin has good watertightness, but it is weak in flexural stiffness and thus cannot support heavy weights. Therefore, dimensional deformation easily occurs over time, and the weight per unit of product is significantly high.

The present invention is a technology to compensate for the above technical drawbacks, long life, cost reduction and large replacement effect of imported wood, as well as beautiful appearance can be used as furniture.

Description

Wood Powder Composite from Layer upon Layer Manufacture}

The present invention is a product in the form of reinforcing the resin layer of both sides or one side to the fused plywood of wood powder (pulverized powder such as waste wood) and synthetic resin widely used in building, ship repair or formwork plywood and building interior and exterior materials and furniture It relates to a method for producing a material of a beautiful appearance.

Currently, formwork plywood uses plywood in the form of compressed wood, which is discarded for 1-2 times of use due to its poor watertightness. On the other hand, synthetic resin plywood has good watertightness, but the weight of the product itself is high and the flexural rigidity is weak, so that deformation occurs during concrete pouring. Therefore, the construction company avoids its use, and also has a disadvantage in that sawing and nailing are not easy.

A product that compensates for these shortcomings is plywood, which is a composite of wood and resin, which has good watertightness and light weight compared to resin plywood, but is weak due to its weak shear strength and rough appearance. It is impossible to use as exterior materials and furniture materials, and there is a breakdown phenomenon, so it cannot bear heavy weight concrete load.

Accordingly, the present invention is an invention having both the lightness and workability of the wood plywood, the watertightness and the bending rigidity and the appearance of the resin plywood.

At present, human beings have been generalized by the standard of living and the development of technology, and human beings exist in the flood of various injection and extruded products. The environmental pollution that follows is also unspeakable reality.

Therefore, various layers are seeking ways to recycle, but there is no special way, and humanity is avoiding the preference of recycled products.

Recycling range of resin has been used for some limited purposes such as containers and corrugated pipes, but it is extremely limited to use waste synthetic resin because it cannot produce products affected by temperature rise due to environmental hormones.

In addition, the use of wood is gradually limited to the part of wood to preserve the ecosystem. Therefore, it is clear that current wood plate prices will rise later. In addition, because waste wood or furniture is not collected, it is incinerated by individuals, or this is also legally restricted and left unattended, which not only harms the city's aesthetics, but also becomes a hotbed of odor and safety accidents and pathogens. Waste materials must be recycled.

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The present invention is produced in an extruder equipped with two screws in one flat head, the screw extruder No. 1 in the screw extruder to crush the waste wood or waste furniture to a size of 25 mesh or less to dry to less than 4% moisture and recycled polypropylene 15-30% by weight of powdered resin, 70-85% by weight of wood powder and 0.5-2% by weight of calcium oxide are added, mixed and extruded in an extruder at 160-200 ° C. to reach the extruder head. The resin is extruded at 150-190 ° C by adding 1-4% by weight of pigment, and a 1-3 mm resin layer is formed above and below the wood flour composite layer extruded from the extruder at the extruder head. It is produced in a structure.

It is possible to produce smooth general plywood in cooling process on the produced multi-layered flat plate molding, and it can be produced in the form of plywood with a pattern of negative and embossed shapes by inserting circular rolling process.

In this product, calcium oxide disperses the very small amount of water and gas remaining inside the extruder.

The present invention showed excellent effects in terms of physical properties (property change table 1 and comparative table 2) and is expected to obtain a wide range of substitution effects in the current synthetic resin plywood market.

This is because the high molding quality and economical quality are secured by securing high molding and strong and light material characteristics and exclusive use of this product.

The test was conducted by KS F 5650, and reference standards were referred to KS F 3110, KS M 3008, KS M 3074, and KS F 2221.

1. The present invention can obtain the import substitution effect as a substitute for the wood of physical properties having the advantages of the resin plate and the wood plate evenly.

2. Wastewood. Recycling can be maximized by using waste furniture as a filler.

3. It can contribute to cost reduction by recycling waste plastic resins.

4. By adding various dimensions, colors and patterns, it also helps to extend the production and life of interior and exterior materials and furniture.

5. Can contribute to resource conservation, import substitution effects and environmental pollution prevention.

Claims (1)

Multi-layered sawdust, wood by-product, wood powder and recycled resin powder using polypropylene waste plastic and calcium oxide are mixed and extruded to form a wood powder mixed layer, and a polyethylene resin part is formed on the upper and lower layers of the plate. Plywood Manufacturing Method