JPH03102182A - Drying method for wooden original plate - Google Patents

Abstract

PURPOSE:To facilitate stacking and disassembling of logs, to shorten required time and to simultaneously made finish of a product uniform by stacking original plates in many stages through corrugated plates made of a material having heat resistance and large specific strength to isolate the plates in the case of drying, and then drying it. CONSTITUTION:Corrugated plates 5 are placed on a conveying pallet 2. Original plates 1 sliced from a log are aligned on the plates 5, and the plates 5 and 1 are alternately stacked in many stages. After the stacks of the many stages are conveyed into a drier, they are dried at about 80 deg.C for about one day. Thus, volatile contents such as moisture, etc., contained in the plates 1 are discharged through air passages 4 formed between the plates 5 and 1 by heating to be dried in a state necessary to form an integrated material. Since the wavy plates having constant pitch of waves are employed, the area of the original plate in contact with the air and air passages are increased. Thus, required drying time can be shortened and the original wood can be simultaneously dried more uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for drying raw wood boards sliced from raw wood.

(Prior Art) When making an integrated board from wood, it is necessary to dry the original board obtained by slicing raw wood until the moisture content is about 10 to 20%.

Conventionally, as shown in Fig. 3, original boards 1 sliced from raw wood are piled up in multiple stages on a pallet 2 via spacers called sandals 3, and then dried in a drying room kept at about 80°C. It was left to dry for a day.

The block 3 is used to secure the air passage 4 necessary for drying.
They are inserted between each stage of the original plate 1 at intervals.

Normally, the cross section of the block 3 is 24 mm square and the length is 1.8 mm.
A piece of wood about 2m long is used. Note that if iron and wood come into contact, the wood will darken, so iron cannot be used as wood.

(Problem to be solved by the invention) The blocks were manually arranged at intervals after each stack. In addition, after drying, the stacked logs were manually dismantled and reused.

In this way, the blocks had to be piled up and dismantled one by one, which was very time-consuming.

In addition, the spacing between the perforations tends to be uneven, which may have a negative effect on the quality of the product.

The position where the wood block supports the original board during drying is important; as shown in Figure 4, at the end of the original board 1 that is cantilevered, the
If it is too long, it will crack during drying and cannot be used as an integrated material. Therefore, if the blocks are arranged closely, the area where the original board comes into direct contact with the air and the area where the air passes will decrease, resulting in a longer drying time.

Furthermore, the sunwood itself cracked due to the stress of heat, humidity, and load during drying, making it unusable after about a year and requiring replacement quite frequently.

The present invention was made to solve the shortcomings of the conventional method of drying raw wood, and its purpose is to facilitate the stacking and dismantling of raw wood, shorten the required time, and at the same time, ensure a uniform finish of the product. The purpose of the present invention is to provide a method for drying raw wood boards.

[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the present invention uses a heat-resistant ratio to isolate the original boards sliced from logs when drying them. The method is characterized in that the original plates are stacked in multiple stages via corrugated plates made of a material with high strength, and then the original plates are dried.

In the present invention, by forming the spacer in a corrugated shape, the area where the original plate is in direct contact with the air and the area through which the air passes can be increased, and the time required for drying can be shortened.

In addition, by adjusting the pitch of the waves, the length of the cantilevered part formed at the edge of the original plate is kept within a specified value, suppressing the occurrence of cracks at the edge of the original plate, and improving the product yield. By selecting a material that is resistant to stress caused by temperature, humidity, load, etc., the life of the spacer can be extended and the cost required for replacing the spacer can be saved.

(Example) Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

As shown in FIG. 1, the corrugated sheet 5 is placed on a pallet 2 for transportation. On this corrugated plate 5, original plates 1 sliced from logs are arranged, and further the corrugated plates 5 and original plates 1 are stacked alternately in multiple stages. After carrying the multi-tiered products into a dryer (not shown), they are dried at about 80° C. for about one day.

The corrugated plate has a thickness of 1.2 mm and a length of 1.8 mm.
GFRP (glass fiber reinforced plastic) with a wave pitch of 50 mm and a wave height of 24 mm was used. This GFRP uses a glass mat made of chopped glass as a base material, an isophthalic acid-based unsaturated polyester resin as a matrix, and is molded by a continuous panel molding method.

According to this embodiment, volatile matter such as moisture contained in the original sheet 1 is heated and discharged through the air passage 4 formed between the corrugated sheet 5 and the original sheet 1, thereby creating a composite material. dried to the required condition.

In addition, in the conventional method of drying wooden boards, it was necessary to arrange several pieces of wood per layer, but in this example, a single corrugated board was used, so the arrangement work was done only once. Became. In addition, since GFRP with high specific strength is used, the total weight is lighter than conventional sandals, making it easier to transport.
It has become easier to automate loading work.

In addition, since a corrugated plate with a constant wave pitch was used, the contact surface with the original plate was reduced compared to the case of using sandals, and the area in which the original plate came into direct contact with air and the number of air passages were increased. This makes it possible to shorten the drying time and at the same time dry the raw wood more evenly.

Furthermore, by adjusting the pitch of the waves, the length of the cantilevered portion of the original plate was reduced, making it possible to prevent cracks from appearing after drying.

In the above embodiments, a certain corrugated plate made of GFRP was used, but materials other than GFRP can be used as long as they have a high specific strength and do not discolor the original plate.

For example, KFRP (Keplar fiber-reinforced plastic) reinforced with Kevlar fibers, FRP (fiber-reinforced plastic) using a mixture of Kevlar fiber and glass fiber as a reinforcing material, etc. have a lower specific gravity and are lighter than GFRP. , handling and transportation become easier.

Furthermore, in the above examples, unsaturated polyester was used as the matrix of FRP, but thermosetting resins such as epoxy and polyimide, thermosetting resins such as polyetheretherketone and polyethersulfone, etc., and the use temperature , resin can be used that is durable for a long time in the atmosphere.

Furthermore, in addition to FRP, it has a higher specific strength than sand,
As a material that does not discolor the original plate, FRM (fiber reinforced metal), which is made of heat-resistant inorganic fibers such as alumina, silicon carbide, and carbon containing a metal such as aluminum, or a corrugated sheet made of a metal with a low specific gravity such as aluminum can also be used.

Further, as the shape of the corrugated sheet, various shapes as shown in FIG. 2 (0 to (e)) can be used alone or in combination. In other words, the corrugated sheet shown in FIG. The corrugated plate shown in Fig. 2(b) has a sharp top and bottom, and the corrugated plate shown in Fig. 2(C) has the length from the top to the bottom of the wave and the length from the bottom to the top. The corrugated plate shown in Figure 2 (d) has flat tops and bottoms, and the corrugated plate shown in Figure 2 (d) has sharp tops and flat bottoms. It is possible to use various types of corrugated sheets, such as corrugated sheets, alone or in combination.

However, if there is a long cantilevered part, it will crack during drying, so the pitch between the peaks at the end of the corrugated sheet should be 5 (1 mm or less).Other corrugated sheets with holes drilled in them should be used. For example, a hole with a diameter of 10 wφ is made in the abdomen of the wave. By making the hole in this way, it is possible to improve the circulation of air in the vertical direction, so that the drying time can be further shortened.

Additionally, by making holes, the weight is reduced and air resistance is reduced, making it easier to handle and transport.

[Effects of the Invention] As explained above, the present invention has the following effects.

(1) Since a single piece of corrugated plate is used as a spacer, the spacers can be arranged at once.

(2) Since a corrugated plate made of a material with high specific strength was used,
The spacer is lightweight, easy to handle and transport, and easy to automate.

(3) Compared to conventional sandals, the area that comes into direct contact with the air and the air passages are larger, allowing for faster drying, and at the same time, the use of corrugated plates of a certain shape allows for uniform drying.

(4) By adjusting the pitch of the waves of the lined plate, the length of the cantilevered portion of the original plate can be shortened and cracking of the original plate can be prevented, thereby improving the yield of the product.

(5) By using a heat-resistant material for the corrugated plate, the life of the spacer can be extended, so the replacement cost is lower than in the case of wood.

(6) There is no phenomenon of darkening of the original board when it comes into contact with wood, and there are very few product defects due to drying.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, and Fig. 2 0) to (
e) is a vertical cross-sectional view of various corrugated sheets used in the present invention, FIG. 3 is a vertical cross-sectional view of original sheets stacked by the conventional method, and FIG. 4 is a diagram for explaining the cantilever portion in the conventional original sheet drying method. FIG. 1...Original board, 2...Pallet, 3...Sanki, 4...Air passage, 5...Corrugated board, A...Cantilever part (7317) Agent: Nori Chika, patent attorney Yu (8)
869) Kenyo Deshimaru/I! I /'V\○ζ5 ((1) Door Q ~ Meat 5 (b) Door 6s (C) (d) Noheno\ζ5 (e) 2nd question

Claims (1)

[Claims] In a method for drying raw wood boards, in which raw boards sliced from raw wood are dried, the original boards are stacked in multiple tiers through corrugated plates made of heat-resistant material with high specific strength in order to isolate the original boards, and then the original boards are A method for drying a wood board, characterized by drying.