JP2000127119A - Heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the solidification and surface treatment of a binder simultaneously. SOLUTION: An apparatus is formed to have a through passage 50 by installing a pair of insulators 16 between an upper mold positive electrode 12 and a lower mold negative electrode 14, a product 39 in which a lot of wood pieces are compressed in a desired cross-sectional shape by a roll molding machine is high frequency-heated in a process in which the product 39 is received continuously from the inlet of the passage 50, allowed to pass through the passage 50, and discharged continuously from the outlet of the passage 50. In this way, a binder introduced into the product 39 is solidified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heating device,
In particular, the present invention relates to a heating device used for drying particle materials.

[0002]

2. Description of the Related Art A plate-like product obtained by applying a synthetic resin adhesive to small pieces (particles) of wood or other vegetable fibers and artificially molding the same is called a particle material or a particle board. Conventional particle materials, for example, as apparent from the description of pages 663 to 701 of the "Wood Industry Handbook", supervised by the Ministry of Agriculture, Forestry and Fisheries Forestry Laboratory issued in 1994, mainly by the pressing method, It is formed in a flat plate shape.

[0003]

However, since the conventional use of the particle material is mainly a building material, it is necessary to make the surface not unsightly due to its properties. Needed.

[0004] Therefore, an object of the present invention is to make it possible to perform surface processing at the time of molding so as not to have such a problem.

[0005]

In order to solve the above-mentioned technical problem, the technical means taken in the first aspect of the present invention comprises a pair of insulators between an upper positive electrode and a lower negative electrode. A product formed by providing a through-passage by interposing a plurality of pieces of wood compressed into a predetermined cross-sectional shape by a roll forming device is continuously received from an entrance of the through-passage, and the product is inserted into the through-passage. The heating device is configured so as to solidify a binder impregnated in the product by high-frequency heating the product in a process of being continuously fed from the outlet of the through passage through the passage. .

According to a second aspect of the present invention, a heater device is added to both the upper positive electrode and the lower negative electrode of the heating device according to the first aspect.

In a third aspect of the present invention, a small hole is formed in one of the upper positive electrode, the lower negative electrode, and the insulator of the heating device according to the first aspect.

[0008]

According to the structure of the first aspect of the present invention, since the product is heated at a high frequency in the process of passing through the heating device, the binder impregnated in the product is solidified, and at the same time, the surface of the product is smooth.

According to the second aspect of the present invention, the heating of the surface of the product is performed in addition to the heating of the inside of the product by high frequency, so that the temperature distribution becomes uniform over the entire area of the product, which is accompanied by the existence of a temperature difference. A defect (for example, warpage) can be prevented.

Further, according to the structure of the third aspect, the steam generated inevitably due to the high-frequency heating of the product can be released to the outside through the small holes, and the trouble (according to the internal pressure of the product) caused by the accumulation of the steam can be prevented. The expansion of the product due to the rise makes it difficult to move the product in the device).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a piece of wood 21 impregnated with a binder is supplied to a supply section 31 of a production line 30. The wooden piece 21 thus put into the conveyor 32
In this transfer process, the wooden piece 21 is transported forward by the rollers 35 of the molding device 33.
-It is pinched by 35 and compressed so that its cross section becomes rectangular. The wooden piece 21 thus compressed to have a rectangular cross section becomes a continuous product 39 as a whole.
As will be described later in detail, the product 39 is subjected to high-frequency heating in the heating device 37 so that the wooden pieces 21 are strongly bonded to each other and the surface is smooth. The product fed from the heating device 37 is cut into predetermined dimensions by rollers 37 in a post-process (not shown), and is used as it is as a building material.

As shown in detail in FIG.
Is provided with an upper positive electrode 12 and a lower negative electrode 14, and a pair of insulators 16 is interposed therebetween to form a through passage 50 in the heating device 10.
The insulator 16 also has the meaning of reinforcement, and a polyketone resin, which is a so-called super engineering plastic, is employed. The cross-sectional shape of the through passage 50 is a rectangle that is the same as the cross-sectional shape of the product 39 supplied as a continuous pair. However, the cross-sectional shape is not limited to a rectangle, and may be another shape.

A product 39 obtained by compressing a large number of wooden pieces 21 into a rectangular cross-sectional shape by a roll forming device 33 passes through the through passage 5.
The heating device 10 can be continuously received from the inlet of the heating device 10. The product 39 passes through the through passage 50 and is continuously fed from the outlet of the through passage 50 as shown by an arrow.
In the process, the product 39 is heated by high frequency. That is, one electrode and the other electrode of the high-frequency oscillator 20 are connected to the upper positive electrode 12 and the lower negative electrode 14, respectively, and by the operation of the high-frequency oscillator 20, the binder impregnated in the product 39 is removed. It is intended to be excited and interconnected, solidified as a whole.

A round bar-shaped heater 18 is mounted on both the upper positive electrode 12 and the lower negative electrode 14 of the heating device, and the upper positive electrode 12 and the lower negative electrode 14 are fixed to each other. It is designed to warm up to the temperature. That is, when power is supplied to the heater 18 from the control box 24 and the temperature of the heater 18 exceeds a predetermined value, the thermostat 22 operates and the heater 18 is not heated. Although not shown, a filter is provided between the heater 18 and the control box 24 in order to prevent high-frequency backflow from the heater 18. Heating of the product 39 by high-frequency heating is internal heating of the product 39 (electrode 1
Since the heating by the heater 18 is the heating of the surface of the product 39, the temperature distribution becomes uniform over the entire area of the product 39, and a defect due to the temperature difference, for example, Deformation such as warpage can be prevented.

Further, steam is inevitably generated along with the high-frequency heating of the product 39 and the heater, and the steam is inevitably shown in the figure, but the upper positive electrode 12, the lower negative electrode 14, and the insulator 16 are not shown. Can be released to the outside through a small hole (0.5 to 2 mm in diameter) formed in any of the above. Thus, when steam stays in the heating device 10, the product 39 increases with an increase in the internal pressure of the product 39.
Expands, making it difficult for the product 39 to move in the through passage 50. However, such a problem can be prevented beforehand due to the release of water vapor.

The above description is merely an example, and those having the same concept as the present invention belong to the technical scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a manufacturing process of a particle material employing a heating device according to the present invention.

FIG. 2 is a schematic diagram of a heating device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating apparatus 12 Upper positive electrode 14 Lower negative electrode 16 Insulator 20 High frequency oscillator 21 Wood piece 33 Roll forming apparatus

Continuation of the front page (72) Inventor Daisuke Kawaguchi 2-1-1 Asahicho, Kariya-shi, Aichi F-term (reference) in Aisin Seiki Co., Ltd. 2B260 AA12 BA01 CB01 CD02 EA11 EB02 EB05 EB21 EB42 EC01 EC03 EC18

Claims (3)

[Claims] 1. A pair of insulators are interposed between an upper mold positive electrode and a lower mold negative electrode to form a through passage, and a large number of wooden pieces are formed into a predetermined cross-sectional shape by a roll forming apparatus. By continuously receiving the compressed product from the inlet of the through passage, and high-frequency heating the product in a process in which the product passes through the through passage and is continuously fed out from the outlet of the through passage, A heating device that solidifies the binder impregnated in the product. 2. The heating device according to claim 1, wherein a heater device is added to both the upper positive electrode and the lower negative electrode. 3. The heating apparatus according to claim 1, wherein a small hole is formed in any one of said upper positive electrode, said lower negative electrode and said insulator.