KR20100082081A - The plywood manufacturing method using the fiber - Google Patents

Abstract

PURPOSE: A manufacture method of plywood is provided to improve the tensile force of the plywood using a fiber, and to reduce the manufacturing cost by decreasing usage amount of expensive materials. CONSTITUTION: A manufacture method of plywood comprises the following steps: pre-processing a material wood by steam(1); cutting the material wood with a fixed length(2); cutting the material wood again to make a single panel with a constant thickness(3); drying and setting the panel to fit the standard(4,5); spreading an adhesive among single panels(6); cooling an thermosetting the panel(7); and packing the finished plate after checking.

Description

The plywood manufacturing method using the fiber}

The present invention relates to a plywood manufacturing method, and more particularly, by using a fiber-coated wood having a certain length as a plywood extender can be easily formed plywood, as well as a fiber having a length in the extender It can improve the tensile strength of plywood, reduce the production cost by reducing the relatively expensive consumption of wheat flour, which is conventionally used in the extender, and can reduce the liquidity of the plywood manufacturing cost due to changes in wheat flour price It relates to a plywood manufacturing method.

In general, when producing a product using wood, not only the range of use is limited due to the physical properties of the wood, but also defects as organic matter may occur.

In addition, various researches have been carried out on the efficient use of timber, that is, 100% utilization using limited timber, because the current production of timber as a resource is limited. It is a variety of wood board products (plywood, MDF, PB (Particle Board), OSB (Oriented Strand Board), etc.) are used.

In particular, the plywood and MDF (Medium Density Fiberboard), which are currently produced, are manufactured by cutting a thin end plate from solid wood, applying resin to each end plate, and then laminating each other based on the fiber direction of the end plate. It is a plate-shaped product, and MDF is a plate-shaped product produced by applying pressure-sensitive adhesive to a fibrous chip which is crushed wood, and forming a mat of a certain thickness.

In other words, the big difference between plywood and MDF is the presence of wood grain.

1 is a view showing a conventional plywood manufacturing process, Figure 2 is a view showing a bonding process in the conventional plywood manufacturing process.

As shown in the figure, plywood is used for pretreatment (1), braking (2), cutting (3), drying (4), engraving (5), bonding (6), cold and hot pressure (7), cutting ( 8), polishing (9) and inspection and packaging (10) to complete the process.

Pretreatment (1) is to steam the wood to soften the wood in order to smooth the rotary process for single plate production, and the braking (2) is to cut the pretreated wood to a certain length.

Solid wood cut in the process of cutting (3) is made into a plywood end plate along the circumferential direction to make the end plate, and the manufactured end plate goes through drying (4) and typesetting (5) process, and is suitable for plywood manufacturing. It will be configured to the appropriate standard so that it can be used for maintaining the moisture content and cracked veneer.

In the bonding (6) process, by applying the adhesive 40 to the mutually bonded surfaces of the plurality of end plates cut in the process of the typesetting (5) to cross-laminate the end plates based on the fiber direction, in the cold and hot pressure (7) process A plurality of stacked end plates are pressed.

In this case, the cold pressure is to improve the adhesive strength and work performance of the plywood, and the pressure is applied to the deck in which only the pressure is laminated in the absence of heat.

In addition, heat pressure is a step of applying heat and pressure suitable to each resin to the cold pressed deck for a predetermined time, which is an important process of determining performance as a laminate by curing an adhesive in plywood production.

In the cutting (8) process, the plywood pressed in the cold and hot pressure (7) process is cut to meet the specifications, and the surface of the rough plywood is polished (9) to polish the surface to facilitate secondary processing by the consumer. As a result, it increases the merchandise.

The plywood polished as described above is packaged and finished when there is no abnormality after determining whether there is an abnormality during the inspection and packaging (10) process.

Such plywood is one of the wood-based products of low cost, excellent workability and workability compared to solid wood, and has high industrial utility.

However, the adhesive 40 in the bonding (6) process of the plywood is pressed in the cold and hot pressure (7) process in the liquid state to firmly bond each end plate, but there is no tensile force is easily broken by the tensile force applied to the plywood itself There is a problem.

In order to overcome this, as shown in FIG. 2, additives such as the extender 20 and the curing agent 30 are included to prepare the adhesive 40.

Specifically, the adhesive 40 used in the bonding process 6 is used by mixing an amino- or phenol-based resin with the extender 20, the curing agent 30, etc. in a predetermined ratio.

The extender 20 is a relatively inexpensive subsidiary material rather than a resin, and is used to increase the specific gravity of wheat flour and grain flour, and the method of using the flour flour 22 and grain flour 24 is used together, and the ratio between the adhesive and the extender is made of plywood. In consideration of the workability and the properties of the plywood during the process, the mixture is used at a predetermined ratio.

Due to the mixing ratio of the extender to be found during the process, the cost of the extender is reduced by reducing the use of relatively expensive resin, thereby reducing the manufacturing cost of the plywood.

However, in recent years, as the prices of wheat flour 22 and grain flour 24 increase, the cost of the extender increases, leading to an increase in the cost of plywood manufacturing, and the plywood industry is losing its competitiveness.

The increase in price of wheat flour 22 may continue due to problems such as bioenergy activation and food shortages, and the increase in price of wheat flour 22 due to this tendency loses its meaning as an extender 20, and the manufacturing cost of plywood. As a result, the future of plywood industry required an alternative to reduce manufacturing costs.

Thus, the present invention has been devised to solve the above problems, it is possible to easily form a plywood by using a fiber having a certain length as an extender for plywood with an adhesive coated wood.

In particular, the fiber is separated from the wood, the separated fiber is coated with an adhesive, and then the coated fiber is put in a mold to be molded by a method such as heat pressing, and then the surface grinding process of the wood-forming member formed by heat pressing. By using a fiber generated in the form of a chip, the bonding force between each end plate and the tensile force of the plywood can be improved.

In addition, the chips discarded during the manufacturing process of MDF (Medium Density Fiberboard) are coated with an adhesive, and because they are made of wood and have a length, they can be used as the fiber of the present invention. The purpose is to provide a plywood manufacturing method that can reduce the.

In order to achieve the above object, the present invention is pre-treated with steam, and then driven to a certain length and then thinly cut into a single plate of a certain thickness through a cutting process to dry the typesetting to meet the specifications, between one or more end plates In the plywood manufacturing method of the plywood manufacturing method to be packaged through the inspection process, after the adhesive process to apply the adhesive containing the additives (extenders and hardeners) to the cold and hot pressing, cutting the compressed plywood to the specification, and then packaged through the inspection process, The adhesive is manufactured by replacing part or all of the fiber with a fiber bar, wherein the fiber separates the fiber from the wood, coats the separated fiber with an adhesive, and then puts the coated fiber into a predetermined mold such as heat pressurization. After molding in the manner, it is generated in the form of a chip during the surface grinding process of the wood-forming member formed by the thermal pressing That the fiber has a predetermined length in a timber coated with an adhesive, then the adhesive for the production that the fiber used is applied to each end plate, are joined to each end plate to produce a laminate.

Preferably, the fiber is used in the polishing process when manufacturing MDF (Medium Density Fiberboard).

And the amount of the fiber used is 10 to 45% of the total extender.

In addition, the non-waterproof adhesive force of the plywood using the fiber is 11.97 ~ 21.54kgf / ㎠, the neck breaking rate is 46 ~ 100%.

And the quasi-water resistance of the plywood using the fiber is 9.09 ~ 16.04kgf / ㎠, the breaking rate is 1.5 ~ 56%.

In addition, the water-resistant adhesive strength of the plywood using the fiber is 6.47 ~ 13.71kgf / ㎠, the breaking rate is 36 ~ 48%.

As described above, according to the manufacturing method of the plywood according to the present invention, it is possible to easily form the plywood by easily bonding each end plate, as well as to improve the tensile strength of the plywood by the fiber having a length in the extender, It is possible to reduce the production cost by reducing the relatively expensive usage of wheat flour, which is conventionally used in the extender, and is a very useful and effective invention that can reduce the liquidity of the plywood manufacturing cost according to the wheat flour price fluctuation.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only, and various modifications may be made without departing from the technical gist of the present invention.

Figure 3 is a view showing the bonding process of the plywood manufacturing method according to the invention, Figure 4 is a view showing the mixing ratio of the fiber according to the plywood manufacturing method according to the invention, Figure 5 is a plywood production according to the present invention 6 is a view showing the physical properties of the plywood according to the method, Figure 6 is a view showing the length of each fiber included in a predetermined area according to the plywood manufacturing method according to the invention, Figure 7 is a photograph of FIG.

As shown in the figure, plywood is completed through the pre-treatment, braking, cutting, drying, typesetting, bonding, cold and hot pressure, cutting, grinding, inspection and packaging of the wood.

In this process, the adhesive 100 process of the plywood is to apply the adhesive 140 including the extender 120 and the curing agent 130 to the typesetting end plate 200, the fiber bar 126 to the extender 120 of the adhesive ) As part or all.

In other words, the wheat flour 122 and the grain flour 124, the fiber 126, and the resin are used in the extender 120 at a predetermined ratio to reduce the amount of the wheat flour 122, or the grain flour 124 according to the type of plywood. By using the fiber 126 and the resin in a certain ratio, the price of the wheat flour 122 is not increased, thereby reducing the cost.

At this time, the fiber 126 is a wood coated with an adhesive having a certain length, which means that it is generated through a grinding process on processed wood rather than a simple fiber.

Looking at the production method of the fiber 126, the fibers are separated from the wood, and the separated fibers are coated with an adhesive.

The fibers separated from the logs form a chip, which is then coated as the adhesive is sprayed during movement.

When the adhesive-coated chip is put in a predetermined mold, and the predetermined mold is filled by the fiber, compression molding is performed by a method such as heat pressing, but it is preferable to mold a plurality of times so that voids are removed therein.

Then, the surface of the wood forming member formed by thermal pressing is polished, and the fiber 126 is generated in the form of a chip during the polishing process.

As in the above process, the fiber 126 is a state in which the adhesive is first applied, and will have a length while being wood.

This fiber 126 is used as an extender 120 to produce a plywood, the fiber 126 having a length contained in the manufactured plywood can improve the tensile force of the plywood.

On the other hand, the fiber 126 may be used in the manufacturing process during the manufacturing of MDF (Medium Density Fiberboard), look at the manufacturing process of MDF (Medium Density Fiberboard), to produce a certain size of fiber chips by cutting wood do.

Then, the adhesive is applied to the resulting fibrous chip, and then dried through a drying process. The dried chip is formed into a mat shape by rolling, and is rolled more firmly as the preheating process removes the air therein.

In addition, by applying a high temperature and high pressure to the pre-loaded mat through the hot pressing process, the adhesive is cured to manufacture the plywood, and then cooled.

After cooling, the plywood is polished through the polishing process, and then the secondary cutting and packaging are finished as needed. Chips generated during the polishing process have less water absorption than other fine wood flours. Since components of the invention are similar to those of the fiber 126, the adhesive 140 may be used as the extender 120 in manufacturing the adhesive 140.

As such, the chip generated in the manufacturing process of Medium Density Fiberboard (MDF) is discarded or used as a one-time use, and the manufacturing process of the fiber bar 126 is omitted as the chip is recycled by replacing the chip with the fiber 126 of the present invention. To reduce costs.

As shown in FIG. 4, each ratio of the extender () manufactured by mixing the resin and the wheat flour (), the grain flour (), and the fiber () is indicated, and the fiber bar 126 represents 10 of the total extender 120. It is preferable to use up to 45%, and when the amount of the extender is 10% or less, the amount of adhesive is relatively increased, so that the production cost of plywood increases, and when the amount is 45% or more, physical properties of the plywood are lowered.

As such, the physical properties of the various plywoods using the extender 120 including the fiber 126 are shown as shown in FIG.

First, plywood is divided into urea plywood made of urea resin, melamine plywood made of melamine resin, and phenol plywood made of phenol resin according to the type of resin used in the manufacture. It is classified according to the type, and has different physical properties such as adhesive strength (non-water, semi-water, and water) and formaldehyde emission, and uses are classified according to their properties.

In addition, these plywoods are important for adhesion in physical properties in accordance with the standards of KS F 3101. Since the plywoods produced during the adhesion investigation process are coniferous plywoods, the shearing rate should be investigated together.

The adhesive strength of plywood is classified into non-water, semi-water, and water-resistant adhesion according to the irradiation method.Non-water-resistant adhesion refers to the adhesion strength after exposing the plywood after it is produced. As a result, domestic demand is superior to quasi-water resistant.

Therefore, interior plywood with little exposure to the outside emphasizes non-water resistance and semi-water resistant adhesion, and plywood used where exposed to the outside and affected by moisture such as rain or snow is important for water resistance and water resistance. It matters.

In the present invention, since the method of checking the neck rate is used in the industry, a detailed description thereof will be omitted.

As shown in the figure, first looking at the non-water-resistant adhesion of the plywood using the extender 120 containing the fiber 126, urea plywood is 11.97 ~ 21.02kgf / ㎠ (neck breaking rate 50 ~ 90%), melamine plywood Is 12.72 ~ 21.54kgf / ㎠ (45% 100%) and the phenolic plywood has a state adhesive strength of 15.97 ~ 17.75kgf / ㎠ (85-100%).

The state adhesive strength of urea plywood was found to be 11.97 ~ 21.02kgf / ㎠ and that of 50 ~ 90%, which is close to the conventional (adhesive strength of 12.06kgf / ㎠ at 90%) and better than conventional products. Showed.

In addition, the state adhesive strength of melamine plywood was found to be approximately 12.72 ~ 21.54kgf / cm2 and 45 ~ 100% of adhesive strength, which is close to the conventional (adhesive strength of 16.76kgf / ㎠ and 100% breaking rate). Showed performance.

In addition, the adhesive strength of the phenol plywood was found to be approximately 15.97 ~ 17.75kgf / ㎠ and 85 ~ 100% of the adhesive strength, which is close to the conventional (adhesive strength of 17.59kgf / ㎠ and the breaking rate 85%). Showed performance.

At this time, the specific resistance of the plywood using the fiber 126 is 11.97 ~ 21.54kgf / ㎠, it is preferable that the breaking rate is 46 ~ 100% range.

Next, the adhesive strength of the plywood using the extender 120 containing the fiber 126 in the quasi-water resistant state is 9.09 ~ 11.38kgf / ㎠ (0 ~ 45% of the breaking rate), and the melamine plywood is 10.15 ~ 16.04kgf / The phenolic plywood had quasi-water adhesion of 12.04 ~ 13.21kgf / cm2 (10 ~ 25% of IOP).

The urea plywood was found to be 9.09 ~ 11.38kgf / ㎠ and 0 ~ 45% of the breaking rate, which is approximate to the conventional (adhesive strength of 8.89kgf / ㎠ and 10% breaking rate), and showed better adhesion performance than the conventional products. .

In addition, the quasi-water resistance of melamine plywood was found to be 10.15 ~ 16.04kgf / ㎠ and 0 ~ 55% of the adhesive strength, which is close to the conventional (adhesive strength of 13.97kgf / ㎠ and 20%). Adhesive performance was shown.

In addition, the quasi-water resistance of the phenolic plywood was found to be approximately 12.04 ~ 13.21kgf / ㎠ and 10 ~ 25% of the adhesive strength, which is approximate to the conventional value (70% of the breaking rate at 14.1kgf / ㎠) and slightly lower than the existing product. However, it showed usable adhesion performance.

At this time, the quasi-water resistance of the plywood using the fiber 126 is 9.09 ~ 16.04kgf / ㎠, it is preferable that the breaking rate is 1.5 to 56% range.

Finally, the adhesive strength of the plywood using the extender 120 containing the fiber 126 in the water-resistant state, the urea resin is not water-resistant, so it is not possible to measure, the melamine plywood is 3.14 ~ 6.87kgf / ㎠ ( The phenolic plywood was found to have a water resistance of 12.15 ~ 13.71kgf / ㎠ (35 ~ 50%).

Specifically, the melamine plywood can be confirmed that the adhesive strength of 3.14 ~ 6.87kgf / ㎠ approximating the conventional (adhesive strength 6.93kgf / ㎠) in the experimental value.

In addition, it can be seen that the water-resistant adhesion of the phenolic plywood is an adhesive force of 12.15 ~ 13.71kgf / ㎠ and 35 ~ 50% of the approximation of the conventional (adhesion rate of 50% to 12.84kgf / ㎠) in the experimental value.

At this time, the water-resistant adhesive strength of the plywood using the fiber 126 is 6.47 ~ 13.71kgf / ㎠, it is preferable that the breakthrough rate has a range of 36 ~ 48%.

As described above, even if the fiberba 126 is replaced with some extender 120 in various plywood, it can be seen that there is no difference in adhesive strength or throat breaking rate compared to the conventional plywood-free plywood. 120) By not only reducing the manufacturing cost of plywood, but also eliminating the disposal of fiber, the cost savings and waste of resources can be prevented.

On the other hand, looking at the shape of the fiber 126 included in the plywood, as shown in Figures 6 to 7, it can be seen that, although not a constant size, the maximum is 3.368mm, at least 0.050mm to maintain an average of 0.504mm. .

Fiber bars 126 having various lengths can improve the mutual adhesion and the breakthrough rate of each end plate as it is used in plywood in place of some extender 120, that is, wheat flour 122.

1 is a view showing a conventional plywood manufacturing process,

2 is a view showing a bonding process in the conventional plywood manufacturing process,

3 is a view showing the bonding process of the plywood manufacturing method according to the invention,

4 is a view showing the mixing ratio of the fiber according to the plywood manufacturing method according to the present invention,

5 is a view showing the physical properties of the plywood according to the plywood manufacturing method according to the invention,

6 is a view showing the length of each fiber included in a predetermined area according to the plywood manufacturing method according to the present invention,

7 is a photograph of FIG. 6.

<Description of Symbols for Main Parts of Drawings>

100: bonding process 120: extender

122: wheat flour 124: wheat flour

126: fiber 130: hardener

140: adhesive

Claims (6)

The wood is pretreated by steam, cut to a certain length, and then cut into thin plates with a certain thickness, followed by drying to form a sheet to meet specifications, including additives (extenders and hardeners) between the plated plates. In the plywood manufacturing method that is cold-pressed and hot-pressed after the adhesive process of applying the adhesive, and after cutting the compressed plywood to the specification, the surface is polished, and packaged through the inspection process, Replacing part or all of the extender with a fiber to produce the adhesive, The fiber is separated from the fiber from the wood, the separated fiber is coated with an adhesive, and then the coated fiber is put in a predetermined mold and molded in a manner such as heat pressurization, and then the heat-forming wood forming member is formed. It occurs in the form of a chip during the surface grinding process, The fiber has a certain length of wood coated with an adhesive, After applying the adhesive prepared by using the fiber to each of the end plates, plywood manufacturing method characterized in that for bonding each end plate to produce a plywood. The method of claim 1, The fiber is a plywood manufacturing method characterized in that used in the manufacturing process during the manufacturing of MDF (Medium Density Fiberboard). The method of claim 1, The amount of the fiber used is plywood manufacturing method, characterized in that 10 to 45% of the total extender. The method of claim 1, Non-water-resistant adhesive strength of the plywood using the fiber is 11.97 ~ 21.54kgf / ㎠, and the breaking rate is 46 ~ 100% plywood manufacturing method. The method of claim 1, The quasi-water resistance of the plywood using the fiber is 9.09 ~ 16.04kgf / ㎠, the breaking rate is 1.5 to 56% plywood manufacturing method. The method of claim 1, The plywood using the fiber is a water resistant adhesive strength of 6.47 ~ 13.71kgf / ㎠, the breaking rate is 36 ~ 48% plywood manufacturing method.

Images