KR20010016955A - 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, which is a substitute for wood plywood used for formwork, interior and exterior partitioning materials, furniture materials, etc. currently used construction site, and can significantly improve the watertightness and strength and In addition, since it can be produced at a low price, it can secure competitiveness and diversify the appearance, so there is no need for separate exterior treatment.

The present invention is wood powder. Resin-synthesized multilayer plywood treats both surfaces and one surface layer with synthetic resin layer, and the center part is a fusion of wood powder and rice husk powder and waste plastic resin.

Existing plywood lacks water resistance as a combination of water and water-soluble bonds, so it easily swells and separates when absorbing moisture, resulting in a significant drop in strength and dimensional deformation and decomposition. In addition, plywood made only of synthetic resin has good water tightness, but it has a weak bending 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 disadvantages, 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 that reinforces 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, which is widely used in building boards, formwork plywood and building interior and exterior materials and furniture. It relates to a method of manufacturing the material.

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 has a weak shear strength, which leads to breakage and rough appearance, making it impossible to use for exterior and furniture materials. There was a disadvantage that can not withstand the heavy load of concrete.

Accordingly, the present invention is an invention having all of the advantages of lightness and workability, which is an advantage of wood plywood, and watertightness and bending rigidity, which are advantages of resin plywood, and the appearance.

At present, human beings use plastic according to 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 unrealistic.

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. However, 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 hurts the urban aesthetics, but also becomes a hotbed of odor and safety accidents and pathogens. Waste materials must be recycled.

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 crushed 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. with the addition of 1-4% by weight of pigment, to form a 1-3 mm skin layer above and below the plate extruded once from the extruder head to produce a multilayer structure in the final die.

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 negative and embossed patterns 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 present synthetic resin plywood market.

This is because the high formability and solid, light material properties and exclusive use of this product ensure high quality and economic feasibility.

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 the physical properties having the advantages of the resin plate and the wood plate.

2. It can maximize recycling by crushing waste wood, sawdust and waste furniture as fillers.

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)

Recycling resin powder using waste plastic to sawdust, wood powder, crested rice, chaff (Double-Taek 1 or complex), a by-product of wood, and laminated resin on the outside. Residual moisture removal using calcium oxide and gas removal method and cooling. Polypropylene-based resin is used to facilitate the efficiency and bonding of fillers.