JPH02209202A - Method and device for manufacture of veneer - Google Patents

Abstract

PURPOSE:To enable taking-out of a product whose quality is excellent by preventing generation of a warp, by a method wherein water existing in the inside is heated and a veneer is dried by softening sufficiently fibrous matter of the veneer by making use of a microwave heater. CONSTITUTION:A veneer P is introduced into a microwave heater 12 through an opening part 28. A microwave generating mechanism 30 or 40 is energized through a controller 24 and a microwave is applied to the upper part of the veneer P being sent away through a waveguide 42 to 52. The veneer P where the same is heated sufficiently up to its inside, water content has become a state which is apt to volatile easily and its fibrous matter has become soft is then introduced into a dryer 14. The veneer P led out through an opening part 58 passes through a guide plate 60 and introduced into a box body 62 from an opening part 64. When the veneer P is introduced between rollers, the same is pressed sufficiently extending from both end parts to the central part and the same is made into a flattened state. Hot air passed through waveguides 72, 74 through ducts 82, 84, 86 by energizing hot air generating devices 76, 78, 80 is fed onto the veneer P.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and apparatus for manufacturing veneers, and more specifically, for example, a veneer is attached to the outer side of laminated wood to make its surface look beautiful. The present invention relates to a method and apparatus for manufacturing a veneer used for.

[Background of the Invention] Wood has traditionally been used for houses, furniture, packaging containers, etc. because it enjoys the soft grain and natural wood texture and is easy to process.

In recent years, wood prices have soared due to resource and labor shortages. Therefore, laminated wood is formed by combining various pieces of wood obtained from relatively inexpensive wood, and the surface of the wood is coated with, for example,
A method has been adopted in which a veneer of 2 to 3 fflI11 is attached to create a beautiful surface.

However, in order to obtain the veneer used in this way, the raw material is first immersed in water for a long period of time, and then
It is necessary to soften the fibers contained within by boiling. This is to prevent warping, cracks, etc. from occurring in the veneer when it is cut smoothly from the raw material and becomes the final product.

However, when trying to make this veneer thicker to meet market demands, it first becomes difficult to boil it. Moreover, if it were attempted to pre-soften the fibers by soaking them in water for a long period of time, it would take a considerable amount of time from cutting the raw wood to shipping it to the market, which would definitely not meet the needs.

[Object of the Invention] The present invention has been made to overcome the above-mentioned disadvantages.
A veneer with a thickness of mtn to 12 mm is obtained from freshly cut logs, introduced into a microwave heating mechanism to heat the moisture present inside the veneer, and then passed through a drying mechanism. The moisture on the surface of the veneer is evaporated and dried. Once the dryness is below a predetermined value, the veneer is transported to a cooling process and cooled to a predetermined temperature. The purpose of the present invention is to provide a method and apparatus for producing veneers that can be quickly supplied and shipped in accordance with market demands without cracking, warping, etc. as a product. do.

Means for Achieving the U Object] In order to achieve the above object, the present invention introduces a wood-based board into a micro-liquid heating/heating mechanism to heat water contained in the wood-based board by microwave heating. At the same time, the method is characterized in that the fibers contained in the wood-based board are softened, and the wood-based board is introduced into a drying mechanism in the heated state and dried to a predetermined degree of dryness.

In addition, the present invention first introduces a wood board into a drying mechanism and dries it to a predetermined degree of dryness, and then introduces the wood board into a microwave heating mechanism to remove moisture contained in the wood board. It is characterized by heating and softening the fibers contained in the wood-based board, and then cooling the microwave-heated wood-based board to a predetermined temperature.

Furthermore, the present invention provides a heating device including one or more microwave heating mechanisms that perform microwave heating by introducing wood-based board material;
The microwave heating mechanism includes a drying device that is connected to the heating device and that heats and dries the introduced wood-based board, and the microwave heating mechanism has a waveguide that has an opening larger than the width of one side of the wood-based board. It is characterized by

[Embodiments] Next, preferred embodiments of the method for manufacturing a veneer according to the present invention in relation to an apparatus for carrying out the method will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a veneer manufacturing apparatus according to the present invention. The veneer manufacturing apparatus 10 basically includes a microwave heating device 12, a drying device 14, and a cooling device 16. The microwave heating device 12 includes a relatively large housing 18 , relatively small housings 20 , 22 provided on both sides of the housing 18 , and a controller 24 provided at the top of the housing 20 .

A guide portion 26 for introducing the veneer P obtained as a veneer from raw material into the microwave heating device 12 and an opening 28 communicating with the guide B26 are provided on one side of the housing 18. ing. A first microwave generating mechanism 30 and a second microwave generating mechanism 32 are provided in the upper part of the housing 18, and a microwave generating mechanism 30 and a second microwave generating mechanism 32 are provided on one side of the housing 18, as shown in FIG. A third microwave generating mechanism 34 and a fourth microwave generating mechanism 36 are provided in parallel. Further, on the other side of the housing 18, a fifth microwave generation mechanism 38 and a sixth microwave generation mechanism 40 are arranged in parallel. The microwave generated from the first microwave generation mechanism 30 is emitted downward through the waveguide 42, and
Similarly, the microwaves derived from the microwave generating mechanism 32 are emitted downward through the second waveguide 44.

Similarly, the third to sixth microwave generation mechanisms 34, 36
．． Waveguides 46, 48, 50, and 52 are connected to the waveguides 38 and 40, respectively, and their tips are configured to point toward the single plate P introduced from the opening 28. Between the waveguides 42 to 52, a roller 55 having a relatively small diameter is arranged in parallel with the waveguides.

In fact, inside the casing 18 facing the opening 28, a sprocket that is rotationally driven by a chain 54 under the biasing action of a rotational drive source 53 is stretched, and the chain 54 projects from a plurality of rollers 56, respectively. It meshes with the gear 57.

The veneer P introduced from the opening 28 passes through this roller 56.
The drying device 14 is configured to be introduced into the drying device 14 through a guide plate 60 through an opening 58 provided on the opposite side of the opening 28 of the housing 18 .

Next, this drying device 14 will be explained with reference to FIG.

An opening 64 is provided in one side of the relatively large housing 62 through which one end of the guide plate 60 enters. A transport mechanism 70 driven by a chain 66 is provided inside the casing 62 . A relatively long hollow air guide pipe 72.74 is provided along this long conveyance mechanism 70, and this air guide pipe 72.74 is connected to a hot air generator 76.78.8.
0 via ducts 82, 84 and 86, respectively. A plurality of nozzles 88, 90 are provided on the surface of the air guide pipes 72, 74 facing the conveyance mechanism 70, each having a converging tip. The chain 66 is connected to the housing 62
A rotational drive source provided inside, for example, a sprocket 94 pivotally supported on the rotating shaft of a motor 92 meshes with the sprocket 94, and the chain 66 is provided with a tensioning mechanism offset in the longitudinal direction of the conveying mechanism 70. It meshes with a plurality of sprockets 96 . The chains 66 extend upward through sprockets 96 at both ends of the housing 62, and extend along a roller conveyor 100 supported by an elongated support plate 98 that constitutes the transport mechanism 70. In fact, a pair of brackets 100a and 100b are erected on the support plate 98, and each of the brackets 100a and 100b has a support plate 102a.

102b is fixed. Support plate 102a.

102b is provided with notches 104a and 104b, and rollers 106a and 10, which are relatively heavy in vertical relation, are provided on the support plates 102a and 102b.
6b is pivotally supported.

In this case, the support plates N02a and 102b are provided with plate members 10, respectively, so as to close the notches 104a and 104b.
8a.

108b and 110a, 110b are fixed, and the shaft 11 of the plate member 108a, 108b and the roller 106b
2, the bosses 114a and 114b that fit into the plate member 1
Coil spring 116a between 08a and 108b,
116b is interposed (see FIGS. 4 and 5). In addition, in FIG. 5, reference numerals 118a,
118b, 120a.

120b are the coil springs 116a and 11, respectively.
A bolt for externally fitting 6b is shown.

By the way, a sprocket 124 is fitted to one end of the shaft 122 of the roller 106a.
The chain 66 meshes with 24. - direction, said shaft 12
A first gear 126 is fixed to the other end of the shaft 112, and this first gear 126 is connected to a second gear 126 provided at the end of the shaft 112.
meshes with the gear 128.

Therefore, when the sprocket 124 is rotated by the chain 66, the first gear 126 rotates together with the roller 106a, and the second gear 128 rotates in the opposite direction to the rotation direction. As a result, the mouth/ra 106b also rotates via the shaft 112. At this time, a force is applied to the roller 106b by the coil springs 116a and 116b to press it toward the roller 106a.

Next, an opening 130 is provided at the other end of the housing 62, and a guide plate 132 faces the opening 130. The other end of the guide plate 132 enters the cooling device 16. The cooling device 16 includes a conveyor 142 bridged by a support 140, and a blower 146 is provided adjacent to the conveyor 142.

The air guide pipe 148 connected to the blower 146 is configured to once extend upward, curve, then move downward and open above the conveyor 142. That is, the tip of the wind guide pipe 148 connected to the blower 146 is expanded to form a conveyor! 42. In this case, the cooling device 16 is not necessarily provided. That is, if the temperature of the veneer P sent out from the drying device 14 is below a predetermined temperature, for example, a temperature that can be touched by hand, it is not necessary to provide the cooling device 16.

In the figure, reference numeral 150 indicates a pipe member provided on the upper surface of the casing 62 to discharge moisture generated within the casing 62 to the outside.

The apparatus for carrying out the method for manufacturing a veneer according to the present invention is basically constructed as described above, and its functions and effects will be explained next.

For example, a plurality of veneers P having a thickness of 7II+Il are placed in the opening 28.
The microwave heating device 12 is placed on a conveyor (not shown) provided upstream of the microwave heating device 12, and introduced into the microwave heating device 12 through the opening 28. The first microwave generation mechanism 30 to the sixth microwave generation mechanism 40 are energized via the controller 24, and the microwaves are transmitted from these microwave generation mechanisms 30 to 40 through the waveguides 42 to 52 to the chain 54, The light is irradiated onto the veneer P conveyed via the rollers 56. At this time, the rollers 55 arranged in parallel between the plurality of waveguides 42 to 52 can easily transport the veneer P even if it is short. At this time, the frequency of the microwaves derived from the microwave generating mechanisms 30 to 40 is preferably about 2450 MHz. This is because the frequency is suitable for heating and softening the moisture contained in the veneer P and the fibers contained in the veneer P.

In the device of the present invention, six microwave generation mechanisms are provided in order to uniformly heat a veneer with a thickness of 5 [llffl or more.For example, a waveguide can be branched from one microwave generation mechanism. Of course, a method of irradiating the veneer P onto the roller 56 can also be considered, but according to experiments, the closer to the opening 28 side, that is, the more upstream side, the more energy for heating the veneer P is absorbed. The energy extracted from the side waveguides will be relatively low.

As a result, there is a concern that the veneers may not be heated sufficiently, so in the device of the present invention, six microwave generation mechanisms are used, each of which applies microwaves of sufficient energy to the plurality of veneers. It was possible to irradiate P.

Then, the veneer P, whose interior has been sufficiently heated through the microwave heating device 12 to easily evaporate moisture and whose fibers have become soft, is then introduced into the drying device 14.

The veneer P led out through the opening 58 passes through the guide plate 60 and is introduced into the housing 62 through the opening 64 .

During this time, if the motor 92 is energized to rotate the chain 66, the sprocket 124 will be rotated by the chain 66, and the roller 106a will be rotated. As mentioned above, the first gear 12 rotates integrally with this roller 106a.
6 rotates the second gear 128, and as a result, the roller 106b adjacent to the roller 106a also rotates.

When the veneer P is introduced between the rollers 106a and 106b, coil springs 116a and 1 are attached to the roller 106b.
In order to apply sufficient pressing force by 16b and maintain sufficient gravity, the veneer P, together with the softened fibers, is sufficiently pressed from both ends to the center and flattened. become.

Therefore, if the hot air generator 76.78.80 is energized, the air guide pipe 72.74 will pass through the duct 82.84.86.
The hot air that has passed through is sent from the tip of the nozzle 88.90 to the veneer P.
Leading up to being fed on top. Therefore, the microwave heating device 1
Moisture in the veneer heated by the cooling device 2 is removed under the biasing action of the hot air generators 76 to 80, and introduced into the cooling device 16 through the guide plate 132 provided in the opening 130.

Since the blower 146 only blows ordinary air, the cooling air that has passed through the air guide pipe 148 is supplied onto the veneer P that is being conveyed on the conveyor 142, and is heated in the drying device 14 until it becomes relatively hot. The veneer P thus obtained is suitably cooled. Therefore, the worker can easily handle this veneer P by hand. In this embodiment, the microwave heating device 12 is provided upstream of the drying device 14, but the same effect can be obtained even if the microwave heating device 12 is provided downstream of the drying device 14. Furthermore, when a thicker veneer is introduced into this apparatus in order to remove moisture, it is of course possible to introduce the microwave heating apparatus 12 between the respective drying apparatuses 14.

[Effects of the Invention] As described above, according to the present invention, when a relatively thick veneer that has just been cut from raw wood is introduced into the apparatus and is to be processed as quickly as possible, microwave heating is not required. A device can be used to heat the moisture present inside the veneer and soften the fibers of the veneer sufficiently. Moreover, there is a concern that warping may occur due to the short drying time, but by making the roller sufficiently heavy and applying pressure with a coil spring, we can prevent warping of the veneer. It is possible to do so. For this reason, it can be produced as a product of excellent quality. Furthermore, since it is possible to sufficiently remove moisture from the veneer, later on,
For example, even when this is attached to laminated wood, there is no fear of cracking or the like.

Therefore, it is possible to provide veneers that meet market needs in a short period of time.

Although the present invention has been described above by citing preferred embodiments, the present invention is not limited to these embodiments (
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a veneer manufacturing apparatus according to the present invention, FIG. 2 is a partial cross-sectional plan explanatory view of the veneer manufacturing apparatus according to the present invention, and FIG. 3 is a veneer manufacturing apparatus according to the present invention. FIG. 4 is a partially omitted perspective explanatory view of a roller of a conveyance mechanism constituting the apparatus of the present invention, and FIG. 5 is a partially longitudinal side view of the roller shown in FIG. 4. 10... Veneer manufacturing device 12... Microwave heating device 14... Drying device 16... Cooling device 3
0-40...Microwave generation mechanism 42-52...Waveguide 70...Transportation mechanism 72
．． 74... Air guide pipe 76-80... Hot air generator 88.90... Nozzle 100... Roller conveyor 116a, 116b... Coil fling 1
42... Conveyor 146... Blower patent applicant Marunaka Kakoki Co., Ltd.

Claims (9)

[Claims] (1) A wood board is introduced into a microwave heating mechanism, and the moisture contained in the wood board is heated by microwave heating, and the fibers contained in the wood board are softened and remain in the heated state. A method for manufacturing a veneer, characterized in that the wood-based board material is introduced into a drying mechanism and dried to a predetermined degree of dryness. (2) A method for manufacturing a veneer according to claim 1, characterized in that the wood-based board having a predetermined degree of dryness is then introduced into a cooling mechanism and cooled to a predetermined temperature. (3) A method for manufacturing a veneer according to claim 1 or 2, characterized in that the microwave heating step and the drying step are repeatedly performed on the wood board material until a predetermined degree of dryness is reached. (4) Once the wood-based board is introduced into a drying mechanism and dried to a predetermined degree of dryness, the wood-based board is introduced into a microwave heating mechanism to heat the moisture contained in the wood-based board. A method for manufacturing a veneer, which also comprises softening the fibers contained in the wood-based board, and then cooling the microwave-heated wood-based board to a predetermined temperature. (5) A heating device including one or more microwave heating mechanisms that introduces wood-based board material and performs microwave heating, and a drying device that is connected to the heating device and heats and dries the wood-based board material that is introduced. 1. An apparatus for manufacturing a veneer, characterized in that the microwave heating mechanism has a waveguide having an opening larger than the width of one side of the wood-based board. (6) The veneer manufacturing apparatus according to claim 5, further comprising a cooling device connected to the microwave heating device or the drying device. (7) In the apparatus according to claim 5 or 6, the drying device includes a roller conveyor that clamps and conveys the wood board material, and a plurality of roller conveyors that blow heated air onto one side of the wood board material from between the rollers constituting the roller conveyor. The roller conveyor includes nozzles and a heat source that supplies hot air to these nozzles, and the rollers of the roller conveyor are configured to receive a predetermined pressing force from an elastic member in order to prevent the wood board from warping during drying. Equipment for manufacturing veneers. (8) In the device according to any one of claims 5 to 7, each of the plurality of microwave heating mechanisms has its own waveguide, and the respective waveguides are arranged in parallel with each other, and the plurality of microwave heating mechanisms have their own waveguides. A veneer manufacturing device characterized by providing a veneer conveying means between tubes. (9) The veneer manufacturing apparatus according to claim 8, wherein the conveying means comprises rollers.