KR20230033810A - The manufacturing method of the molded products for which bamboo is the raw material and their molded products - Google Patents

Abstract

The present invention relates to a method for manufacturing a molded product by using bamboo as a raw material and a molded product manufactured thereby. The method comprises: a bamboo processing step of longitudinally slicing dry bamboo into a plurality of square pillar-shaped pieces having a horizontal length of 4 mm, a vertical length of 4 mm, and a height of 30 mm; a mixing step of putting 97 wt% of the plurality of bamboo chips prepared through the bamboo processing step and 3 wt% of a thermosetting adhesive into a stirring device and mixing the same; an extrusion processing step of putting the mixture of the bamboo pieces and adhesive mixed through the mixing step into an extruder and processing the mixture into a cylindrical bamboo-piece mixture; and a bamboo molded product manufacturing step of putting the bamboo piece mixture extruded through the extrusion processing step into a molding machine with a temperature controlled between 90-100 ℃ and then compressing the mixture to prepare a molded product prepared by using bamboo as a raw material. Accordingly, the bamboo molded by the present invention is manufactured by using bamboo which has been produced in large quantities, is used for limited purposes, and has not been used much, such that the bamboo molded product having excellent mechanical properties such as tensile strength and elasticity can be provided; since the bamboo molded product is manufactured by means of a molding frame, processing can be possibly done into any shape, such that bamboo molded product may be applied to a variety of fields; a molded product of a novel foam can be provided by using bamboo, such that there is a resource recycling effect; and since the molded product can be applied to the field of lumber, the molded product can be applied to the field where the finest woods are utilized.

Description

The manufacturing method of the molded products for which bamboo is the raw material and their molded products}

The present invention relates to a method for manufacturing a molded product using bamboo as a raw material and a molded product thereof, and more particularly, to a method for manufacturing a molded product using bamboo and having mechanical properties such as excellent tensile and elastic strength, and a method for manufacturing the molded product using the same. It's about molding.

In general, when products are produced using raw wood, the range of use is generally limited due to the physical characteristics of raw wood, and defects as an organic material may occur.

At the same time, since the current production of hardwood as an environmental resource is limited, various studies have been conducted on the efficient use of hardwood, that is, a plan to utilize 100% of the limited wood, and the results of the research are currently interior/exterior materials for construction, furniture, and structures. It is a variety of wooden board products (plywood, MDF, PB (Particle Board), OSB (Oriented Strand Board), etc.)

Among the plate products currently being produced, plywood is a plate-like product manufactured by cutting thin veneers from hardwood, applying resin to each veneer, and then cross-laminating each veneer based on the fiber direction of the veneers.

Among other plate products, MDF is an abbreviation of Medium Density Fiber board, which is a medium density fiber board. A medium density board is made by separating the fibrous tissue of a tree, pushing an adhesive and pressing it with strong pressure. As it rises, it becomes very heavy, and the formaldehyde component contained in the adhesive can have a bad effect on health, so it has been avoided recently.

As this MDF is an artificial material, it is manufactured in various thicknesses, and the texture of the surface is uniform and smooth, so if you paint it with acrylic paint, you can get a plastic-like surface. falls a lot MDF is mainly used for interior decoration, and it can also be used as a product that looks like wooden furniture by attaching natural veneer to the surface by using the advantage of its smooth surface.

Among other plate products, PB is an abbreviation of Particle Board, which is a kind of recycled material. It is made by crushing wood into small particles, making it into a plate using an adhesive, and attaching a film with a tree pattern to the surface to complete it. These PBs are used as built-in cabinets, sinks, shoe racks, etc. in homes, and are mainly used as table tops in general restaurants. Since they are made of small grains and are lighter than other woods, they can come in contact with moisture thanks to the film attached to the surface. However, there is a disadvantage in that the wide side of the plate to which the film is attached must be cut and an additional film strip must be attached to the cut portion.

As a prior art, Korean Patent Registration No. 10-1150726 discloses that even if a wood panel is used as a flooring material for ondol, it is possible to improve the dimensional stability of wood by blocking the absorption and hygroscopicity of wood, and various strength performances due to resin injection hardening. Disclosed is a method for manufacturing a thermosetting resin-injected wood panel that can significantly improve. According to the disclosed technique, a cutting step of cutting raw wood into a plate; A plate material drying step of drying the cut plate material; It consists of a resin injection step of injecting a thermosetting resin into the plate material, a resin curing step of curing the thermosetting resin injected into the plate material, and a processing step of processing the plate material in which the thermosetting resin is cured. A plate material input step of inputting a plate material, a vacuum step of vacuuming the tank into which the plate material is input, a resin introduction step of introducing a thermosetting resin into the tank when the inside of the tank is vacuumed, and a thermosetting resin introduced by pressurizing the inside of the tank. A pressurizing step of forcibly injecting the thermosetting resin into the plate material, and a resin recovery step of recovering the thermosetting resin present in the tank when the injection of the thermosetting resin into the plate material is completed by the pressing step, and a plate material in which the thermosetting resin is injected from the tank. It is characterized in that it consists of a recovery step.

As described above, in the conventional chipboard manufacturing method, the supply of wood, the main raw material of chipboard, is not smooth, and due to the nature of wood, it takes a long time to consume living trees and plant trees again. This is continuously rising, so it is not suitable for consumers who need eco-friendly chipboards by using waste wood to reduce prices or using chemical adhesives (eg formaldehyde) to manufacture chipboards. Since the formaldehyde level is lowered, it is difficult to export overseas. In addition, since the chipboard must be manufactured after the wood is made into sawdust, it takes a long time to make the wood into sawdust through many processes, and it has the disadvantage of providing less chipboard within a short period of time. Since it is used after being cured and molded, there is a problem of bending or breaking due to a drop in tensile force or elasticity.

On the other hand, bamboo is a plant with so many uses that it is said that it is a gift from God, and where bamboo grows, there are cultures and civilizations that have developed products that use bamboo as a resource. It is used in a variety of places such as architecture, tableware, accessories, and weapons.

Bamboo is one of the materials used a lot for tableware and weapons. In fact, in Damyang, where bamboo forests are the most abundant in Korea, rice and other grains steamed in a bamboo tube are the local food and weapons such as bamboo swords and bamboo spears. also made with It is processed and used as herbal medicine, and it is poured into a wine barrel to make juktong wine, and bamboo leaves are used to make a liquor called Jukyeopcheong, and bamboo gin is squeezed to make a liquor called bamboo shoots. Bamboo salt is also made by putting salt in a bamboo tube and roasting it 9 times.

It is also a plant that is presumed to be the reason why hand axes are not found in Paleolithic China. In other regions, stone tools would be needed for hunting, but in China, where bamboo is abundant, there was bamboo that could be used as a hunting weapon, so it would have been enough to use stone tools or not.

However, these bamboos grow luxuriantly in a short period of time because of their good growth and growth activities, have excellent elasticity and tensile strength, and have a large amount of production.

Therefore, there is a continuous demand for research into a method of manufacturing moldings that can be used in various fields of daily life using bamboo having many advantages.

Republic of Korea Patent Registration No. 10-1209916, published on April 11, 2011 Republic of Korea Patent Registration No. 10-1150726, published on May 22, 2012

Therefore, the first object of the present invention to solve the above problems is to provide a method for manufacturing a bamboo molding having excellent tensile and elastic mechanical properties using bamboo, which has a large amount of production but limited use and is not used much. The second purpose is to provide bamboo moldings with a variety of application fields because it can be processed in any shape as a molding produced by a mold mold, and the third is to provide a new type of molding using bamboo, so resources Its purpose is to provide a bamboo molding that is effective and applicable to the field where high-quality wood can be used as a molding applicable to the wood field.

In order to achieve the above object, the present invention is a bamboo processing step in which dried bamboo is cut in the longitudinal direction and prepared by cutting into a plurality of square pillar-shaped pieces having a width of 4 mm, a length of 4 mm and a length of 30 mm. And, a mixing step of mixing 97% by weight of the bamboo pieces prepared through the bamboo processing step and 3% by weight of the thermosetting adhesive in a stirrer, and mixing the bamboo pieces and the adhesive mixture mixed through the mixing step into an extruder to form a cylinder An extrusion processing step of processing a shaped bamboo piece mixture, and a bamboo molding product in which the bamboo piece mixture extruded through the extrusion processing step is put into a mold molding machine temperature controlled at 90 ° C. to 100 ° C. and compressed to produce a molded product made of bamboo as a raw material. This is achieved by the configuration of the manufacturing steps.

According to the present invention as described above, there is an advantage in that it is possible to provide a bamboo molding having excellent tensile and elastic mechanical properties by using bamboo, which has a large amount of production but a limited use and a small amount of usage.

In addition, since it can be processed in any shape as a molded product produced by a mold, it has various advantages in application fields.

Furthermore, since it can provide a new type of molding using bamboo, it has a resource utilization effect, and as a molding applicable to the wood field, it is a very useful invention that can be used in the field where high-quality wood can be used.

In order to achieve the above object, the present invention is a bamboo processing step of preparing by cutting dried bamboo in the longitudinal direction and cutting it into a plurality of square pillar-shaped pieces having a width of 4 mm, a length of 4 mm and a length of 30 mm, and A mixing step of mixing 97% by weight of the bamboo pieces prepared through the bamboo processing step and 3% by weight of the thermosetting adhesive in a stirrer, and mixing the bamboo pieces and the adhesive mixture mixed through the mixing step into an extruder to form a columnar shape An extrusion processing step of processing the bamboo piece mixture of the step, and a bamboo piece production in which the bamboo piece mixture extruded through the extrusion processing step is put into a mold molding machine temperature controlled at 90 ° C. to 100 ° C. to compress it to produce a molded product made of bamboo as a raw material. consists of steps.

Hereinafter, a method of manufacturing a molded article using bamboo as a raw material according to an embodiment of the present invention and a bamboo molded article manufactured by the manufacturing method will be described.

The method for manufacturing a molded product using bamboo as a raw material according to an embodiment of the present invention includes a bamboo processing step, a mixing step of bamboo pieces and an adhesive, an extrusion processing step of the bamboo piece mixture, and a step of manufacturing a bamboo molded product.

The bamboo processing step is a step of preparing by cutting dried bamboo in the longitudinal direction and cutting it into a plurality of square pillar-shaped pieces having a width of 4 mm, a length of 4 mm and a length of 30 mm.

In the conventional chip board, wood by-products, such as sawdust, are shredded into irregularly shaped pieces of wood, and then the irregularly shaped pieces of wood are crushed into granular particles to make chips and compress the chips to make chipboards. The chip board has a disadvantage in that it is bent or easily broken due to lack of tensile strength or elasticity.

Therefore, as described above, the present invention is to make a molded product by cutting the dried bamboo into thin square columnar pieces, and unlike the conventional chip board made of sawdust, a high-quality bamboo molded product having excellent tensile and elastic mechanical properties. There are advantages to being able to

The mixing step is a step of mixing 97% by weight of bamboo pieces prepared through the bamboo processing step and 3% by weight of thermosetting adhesive in a stirrer.

Through this mixing step, it is possible to adjust the adhesive strength between the bamboo pieces in the shape of a thin square column through a thermosetting adhesive that adjusts the heat reaction, and the mixing ratio of the bamboo pieces and the adhesive can be changed depending on the application target of the molding to be manufactured. However, considering the adhesive strength between the bamboo pieces, it is preferable that the adhesive contains 3 to 5% by weight.

In addition, the thermosetting adhesive can be either water-based or oil-based, and can be selected according to the use.

The extrusion processing step is a step in which the bamboo pieces and the adhesive mixture mixed through the mixing step are put into an extruder and processed into a cylindrical bamboo piece mixture.

The diameter of the outlet of the extruder may be changed to 20 mm, 30 mm, or 40 mm, and considering that the bamboo pieces used in the manufacture of the bamboo molding according to the present invention have a rectangular column shape and have a length of 30 mm, the diameter of the outlet of the extruder is 20 mm. In this case, the bamboo pieces inside the cylindrical mixture passing through the extruder outlet are extruded in a shape aligned side by side in the longitudinal direction. In addition to the bamboo pieces that are placed in various directions, bamboo pieces located in more diverse directions coexist. The exit of the extruder can be determined considering the shape and properties of the product.

Then, the bamboo piece mixture extruded through the extrusion processing step is put into a mold molding machine temperature-controlled at 90 ° C. to 100 ° C., and then compressed and molded to produce a bamboo molding.

On the other hand, since the product strength of the bamboo molding varies according to the compressive strength of the mold forming machine, the compressive strength of the mold molding machine is adjusted according to the product to be made through the bamboo molding.

Therefore, as described above, the bamboo molding according to the embodiment of the present invention is manufactured by a mold mold and can be processed in any shape, so it has various advantages in application fields.

In addition, the bamboo molding manufactured by this manufacturing method has excellent tensile and elastic mechanical properties, so it can be used in the manufacture of high-end furniture, as well as musical instruments with parts made of wood, such as guitars. The body, neck, and head of the guitar can be manufactured using bamboo moldings.

As described above, the bamboo molding produced by the present invention can provide a new type of molding using bamboo, so it has a resource utilization effect, and as an applicable molding in the wood field, it is very usable in the field where high-quality wood can be used. It is a useful invention.

Claims (3)

A bamboo processing step of preparing by cutting the dried bamboo in the longitudinal direction and cutting it into a plurality of square pillar-shaped pieces with a width of 4 mm, a length of 4 mm and a length of 30 mm;
A mixing step of mixing 97% by weight of the bamboo pieces prepared through the bamboo processing step and 3% by weight of the thermosetting adhesive into a stirrer and mixing;
An extrusion processing step of processing the bamboo pieces and the adhesive mixture mixed through the mixing step into an extruder into a cylindrical bamboo piece mixture;
A bamboo molding manufacturing step of manufacturing a molding in which bamboo is the raw material by compressing the bamboo piece mixture extruded through the extrusion processing step in a mold molding machine temperature-controlled at 90 ° C. to 100 ° C.; Manufacturing method of molded article A molded article manufactured by the manufacturing method of claim 1 According to claim 2,
A molding made of bamboo as a raw material, characterized in that the molding is used for the manufacture of high-end furniture or wooden musical instruments