JPH01314101A - Manufacture of veneer laminate - Google Patents

Abstract

PURPOSE:To contrive an improvement in yield of veneers and dispersion of scarf joint parts adjoining vertically to each other by enabling use of an efficient and multi- stage hot press by preparing the individual veneer into specific lengths and widths beforehand. CONSTITUTION:When a designated length (a) is established, the length of a direction of a fiber is adjusted l+S obtained by adding a length S of a slope of a scarf to a standard length l of one integerth of the designed length (a), in the first layer F1 of a surface sheet and the second layer B2 of a back sheet. Then the length of the direction of the fiber is adjusted to l'+S' by adding a length S' of the slope of the scarf to a standard length l' of one integerth, an integer of which is obtained by either adding or deducting one to or from the integer obtained by dividing the designed length (a) into the standard length l, in the second layer of the surface sheet and the first layer of the back sheet. Then the width is adjusted to W a little shorter than one integerth of the designed length (a), in a core sheet C becoming a cross band. Along with coating of an adhesive agent to necessary sheet surfaces of the surface sheets F1, F2, back sheets B1, B2 and also a necessary sheet surface of the core sheet C they are laminated one after another. After temporary adhesion through cold-pressing, the same is hot-pressed by being inserted into a multi-stage hot press.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention consists of a two-layer top plate and a two-layer back plate prepared by cutting both ends of the wood to a predetermined length with contrasting scarf slopes. , from a core board for cross punts prepared by stacking relatively thin veneer veneers in a scarf joint shape in a staggered fashion to a predetermined structural length, and cutting both end faces to a predetermined width. Generally used as a plate-shaped building material, it is manufactured using a batch manufacturing process in which comparatively thick veneer veneers are stacked in a butt-joint shape in a staggered manner and laminated sequentially to a predetermined structural length. The present invention relates to a method for manufacturing a veneer laminate commonly referred to as LVB (laminated veneer board).

(Prior art) A conventional method for manufacturing a veneer laminate using this type of batch manufacturing process uses a relatively large-area single veneer veneer that is joined in advance to a predetermined structural length. Many of the process operations depended on manual labor.

In addition, the method of directly using individual veneer veneers of relatively small area is based on a continuous manufacturing process, for example, as disclosed in JP-A No. 63-22602, Automatic Assembling Method for Laminated Veneer Materials, etc. There is a known method for manufacturing veneer laminates using a continuous manufacturing process in which individual veneer veneers are assembled into a continuous intermediate product and then heat-pressed continuously. Batch manufacturing processes that use individual veneer veneers directly are not yet known.

[Problem to be solved by the invention]

In the production of veneer laminates using this kind of conventional batch manufacturing process, many of the mechanical and laminating operations depended on manual labor, so predetermined structural lengths were determined in advance in the previous process, etc. In this process, it is necessary to join individual veneer veneers into a single plate using scarf joints or butt joints, which requires a large number of workers and involves a wide variety of processing steps, so the overall process efficiency is extremely low. It was something. In addition, when manufacturing veneer laminates using a continuous manufacturing process, although it is possible to directly use individual veneer veneers with a relatively small area, there is a long continuous assembly process, a continuous heat-pressing process, and a continuous product. In particular, in the continuous heat-pressing process, the only option is to install a long, single-stage continuous hot press, which increases equipment costs and reduces process efficiency. It was significantly lower than that.

Therefore, the present invention aims at producing a veneer laminate using this type of batch manufacturing process, by adhering the two-layer top plate and the two-layer back plate, whose fiber directions are adjusted to a predetermined length, to the required plate surfaces. At the same time, the adhesive is applied to the desired board surface of the core board, which is laminated one after another in a scarf joint shape over the length of the structure, and the direction perpendicular to the fiber direction is adjusted to a predetermined width. At the same time, this is sequentially laminated in a butt-joint-shaped staggered manner along the length of the structure, thereby producing one batch of intermediate products of a predetermined structure length with an appropriate number of plies and sheets laminated at once. By cold-pressing and temporarily bonding, it is possible to use a multi-stage hot press efficiently in the subsequent heat-pressing process, and it is also possible to use a multi-stage hot press during the process of assembling veneer veneers in a staggered manner within a predetermined structural length. The purpose is to improve the veneer yield and to measure the dispersion of scarf joints that are adjacent to each other when stacking.

[Means to solve the problem]

In order to achieve the above object, in the method for manufacturing a veneer laminate of the present invention, each veneer veneer is prepared in advance to a predetermined length and width, that is, the first layer of the top layer is The second layer of the sill board is an integer fraction of the predetermined length of the structure.
The scarf is cut to a predetermined length in the fiber direction by adding the length of the slope of the scarf to the predetermined length. For the eyes and the first layer of the back plate, add 1 to the integer when dividing the first layer of the front plate and the second layer of the back plate into regular lengths that are an integer fraction of the predetermined structure length. Alternatively, the subtracted integer fraction is set as the standard length, and the length is further adjusted when cutting the scarf using the scarf machine, etc., so that it becomes a predetermined length in the fiber direction, which is the addition of the length of the scarf slope to the standard length. Next, the core plate is prepared by cutting to determine the width using a double saw or the like so that it has a predetermined width in the direction orthogonal to the fiber direction, which is slightly shorter than one integer of the predetermined length of the predetermined structure length. It is something to do. Then, the front plate, the back plate, and the middle plate, which have been adjusted to the predetermined length and width, are coated with adhesive on the required plate surfaces using a spreader, etc., and then applied to the suction head along the length of the structure. The core plates are stacked one by one in a staggered manner in a scarf joint shape using a transfer robot equipped with a Then, using a transfer robot or the like equipped with the suction head, the layers are stacked one after another in a butt-joint-shaped staggered manner with a slight gap between them. This is a structure in which the final intermediate product is cold-pressed and temporarily bonded all at once using a cold press or the like.

[For production]

As described above, the present invention is configured such that each veneer veneer is prepared in advance to a predetermined length and width, so that two layers of a top plate and a two-layer back plate with fiber directions parallel to each other are formed. The scarf joint location is an integer fraction of the length of the structure in the case of the first layer of the top plate and the second layer of the back plate, for example, an integer of 4 when divided into 1/4 standard length length. On the other hand, in the case of the second layer of the front plate and the first layer of the back plate, 1/1 is obtained by adding or subtracting 1 from the integer 4 in the case of the first layer of the front plate and the second layer of the back plate,
For example, by the difference in length when divided into regular lengths such as 1/5 and 1/3, the upper and lower adjacent scarf joints of the two-layer top plate and the two-layer back plate are It will be distributed in front and behind. Therefore, if there is a longitudinal joint in the fiber direction of the veneer veneer used, which is stipulated for structural veneer laminates (LVL) similar to this type of veneer laminate, the thickness of the veneer laminate must be exceeded due to its bending strength. There are JAS standards etc. that require the joints of vertically adjacent veneer veneers to be separated from each other by 30 to 70 times more. It was easy to adapt.

In addition, the above-mentioned method of dispersing the scarf joint points of the first layer of the front plate and the second layer of the back plate with respect to the scarf joint points of the second layer of the front plate and the first layer of the back plate. In the case of a 5-ply configuration that requires only one core plate, the structure length of the first layer of the top plate and the second layer of the back plate in the above example is divided into an integer of 1.
It may be either one-fifth or one-third by adding or subtracting, but it may be 5-ply or more, for example, 7-ply,
When using a new middle plate in a 9-ply configuration, etc., add or subtract 1 to the integer obtained by dividing the structural length of the first layer of the top plate and the second layer of the back plate in the above example, or 1/5 or By alternately using the one-third divisions in the upper and lower adjacent middle plates, it is possible to measure the distribution of the scarf joints in each of the middle plates.

Furthermore, as described above, the present invention is configured so that each veneer veneer is prepared in advance to a predetermined length and width.
The top plate, back plate, core plate, or middle plate all fit around the predetermined length of the structure, and the production rate is only about cutting off the excess scarf slope that is slightly formed before and after the predetermined length of the structure. This is similar to when using veneer veneers of the same size as in the conventional construction method, but staggering and overlapping the vertically adjacent joints while separating them as specified according to the JAS standard. In addition, it is possible to eliminate the occurrence of large amounts of veneers that are cut off because they cannot be divided into 1/an integer.

Furthermore, as described above, the present invention uses a batch manufacturing process in which the intermediate products are laminated while being arranged in a predetermined length, so that an appropriate number of plies and a batch of intermediate products are cooled at once for each predetermined length. Since it is configured to be temporarily bonded by pressing,
It can be completely separated from the subsequent heat-pressing process, and by breaking up a batch of temporarily bonded intermediate products into individual intermediate products, each product can be inserted into a multi-stage hot press. This makes it possible to carry out heat and pressure treatment efficiently.

〔Example〕

The embodiment shown in FIGS. 1 to 9 has a two-layer top plate F1. whose fiber directions are parallel to each other. For F2 and the two-layer back plates 81 and 82, a relatively thin rectangular veneer board, for example, about 2#11, is used, and for the core plate C, which is the cross punt, a relatively thick one, for example, 4 This is an example of a case where a 5-ply structure is constructed using a rectangular veneer veneer as thick as a layer.

In the figure, if the structure length a is set to, for example, 3600 m, which is twice the standard size of ordinary plywood, the first layer F1 of the top plate and the second layer B2 of the back plate are Nagaza a
An integer fraction of, for example, a quarter as shown in the figure, is set to a standard length 1, that is, 900M, and a scarf slope length S, for example, a slope approximately 6 times the plate thickness t, is set to the standard length 1. When cutting with a scarf machine or the like, the length S is 12AI+1 in the case of a board thickness of 2 trm, and this is added to the specified length length 1, which is the predetermined length in the fiber direction l0S, that is, the total length of 912 layers m. Adjust the length in the fiber direction. In addition, for the second layer of the front plate and the first layer of the back plate, the first layer F1 of the front plate and the second layer B2 of the back plate are divided into fixed lengths l that are an integer fraction of the structure length a. The integer when 1 is added or subtracted by 1 to the integer 4 in the above example, 1/5 or 1/3 is set to the standard length 1', for example, 5 minutes as shown in the figure. In the case of 1, the standard length 1' is 720M, and the standard length 1' has a scarf slope length S', for example, a slope S' of about 6 times the plate thickness t°,
In other words, the plate thickness is 211I! In the case of No. 11, 127+1111 is added to the predetermined length 1' to obtain the predetermined length J/+3/ in the fiber direction, that is, the total length 732#! In I11, the length in the fiber direction is adjusted during cutting using a scarf machine or the like. Next, the core plate C, which becomes the cross punt, is slightly shorter than one integer of the above-mentioned structure length a, and in this case, as shown in the figure, the core plate C is the first layer F1 of the front plate and the second layer F1 of the back plate. In the case of B2, the same 1/4, that is, slightly shorter than 900 am, for example, a predetermined width W that is about 3 layers shorter, that is, 897, is cut in the fiber direction with a double saw etc. Adjust the width in the orthogonal direction. The reason why the width of the above-mentioned core plate C is determined to be slightly shorter than 1/integer of the structure length a is to form a gap at the mutually abutting points by the expansion of the plate width due to the application of adhesive. This design is designed to safely absorb the expansion so that no overlap occurs at the points where they abut against each other.

Therefore, in the embodiment of the manufacturing process shown in FIGS. 10 to 12, a predetermined length of 10S or 1'
'The two-layer top plate F1. F2 and two-layer backing board B1
, 82, apply an appropriate adhesive, for example, an appropriate adhesive such as urea resin that can be temporarily bonded by cold pressure, to the upper surface using a one-way spray spreader 2, etc.
These were stacked one by one in a scarf joint-shaped staggered manner using transfer robots 4a, 4b, etc. equipped with suction heads 3a, 3b up to the structure length a, and were also adjusted to a predetermined width W in the previous step etc. The same adhesive is applied to the required plate surfaces of the core plate C, which will become the cross punt, using the spreader 2, etc., and this is applied to the mechanism length a by the transfer robots 4a, 4b, etc., leaving a slight gap. The intermediate products 1 are laminated one after another in a staggered manner in the form of open butt joints, and the intermediate products 1 are then laminated to an appropriate number of plies and sheets of a predetermined length. The intermediate product 1 is delivered to a press 6 or the like and subjected to cold pressing for a required period of time to be temporarily bonded, and the intermediate product 1 that has been temporarily bonded is delivered to a subsequent process, separated, and then multi-staged. It is inserted into a mold hot press or the like and is efficiently heated and pressed. In addition, in the figure, 7 is the carry-in conveyor from the previous stage process, and 8 is the spreader 2.
9 is a transfer robot 4a,
4b is a relay conveyor for delivering the veneer veneer, and 10 is a system conveyor configured to be able to be driven in forward and reverse directions and intermittently for construction and lamination.

〔Effect of the invention〕

As explained above, in manufacturing a veneer laminate using this type of batch manufacturing process, the present invention includes a two-layer top plate whose fiber direction is adjusted to a predetermined length, and a two-layer top plate whose fiber direction is adjusted to a predetermined length. Adhesive is applied to the required board surfaces, and the adhesive is laminated one after another in a scarf joint-shaped staggered manner to a predetermined length, and the core board is adjusted to have a predetermined width in the orthogonal direction to the fiber direction. , Apply adhesive to the required board surface, and stack it sequentially in a staggered butt joint shape with a slight gap to a predetermined length, thereby adjusting the number of sheets as appropriate. Because it is constructed so that the first intermediate product of a predetermined length is laminated at once and temporarily bonded by cold pressing, in manufacturing veneer laminates using this type of conventional batch method manufacturing process, Much of the mechanical and laminating operations are manual, and in the previous process, individual veneer veneers are joined together to a predetermined mechanical length using scarf joints or butt joints. The present invention eliminates the disadvantages of requiring a large number of workers, requiring a large number of workers, and requiring a wide variety of processing steps, resulting in extremely low overall process efficiency. Individual veneer veneers can be directly input into the manufacturing process without processing individual veneer veneers with a small area into a single sheet, and a spreader that can control intermittent control and a suction head are installed in the manufacturing process. It also made it possible to introduce a series of automated devices such as a transfer robot with a 3D transfer robot and a cold press equipped with a belt conveyor, so it was possible to streamline the process by significantly reducing the number of process operations and workers compared to conventional processes. . In addition, the production of veneer laminates using the automated batch-type production process of the present invention is different from other continuous production processes, as it requires a long continuous assembly process and continuous heat-pressing process like the conventional process. There is no need to form a continuous product separation process into a series of processes, and the assembly process and heat-pressing process can be completely separated by a temporary adhesion process using cold press, so the subsequent heat-pressing process can be performed using an efficient multi-stage process. Not only can a hot press be used, but even when manufacturing veneer laminates using this type of batch manufacturing process, individual veneer veneers can be prepared in advance to a predetermined length and width with a high yield. The veneer yield is almost the same as that produced by the continuous production process, and moreover, the dispersion of vertically adjacent scarf joints during stacking can be more fully measured than that produced by the continuous production process. Therefore, we were able to achieve excellent results such as being able to provide products made of superior materials at low prices.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the mechanism of the 5-bly configuration, Fig. 2 is a plan view, Fig. 3 is a vertical cross-sectional view taken along line X-X in Fig. 1, and Fig. 4 is a top plate first layer and A side view of the second layer of the back plate, FIG. 5 is a plan view, FIG. 6 is a side view of the second layer of the front plate and the first layer of the back plate, FIG. 7 is a plan view, and FIG. 8 is a side view of the second layer of the back plate. 9 is a plan view of the core plate, FIG. 10 is a plan view showing the entire manufacturing process, and FIGS. 11 and 12 are side views showing a part of the manufacturing process. a...Structure length, 1. i'...Standard length, s, s'
...Length of scarf slope, f+s, i'+3'...
Predetermined length in the fiber direction, Fl...first layer of the top plate, F2...
...Second layer of front board, B1...First layer of back board, B2...
・Second layer of backing plate, C...core plate, W...predetermined width in the direction orthogonal to the fiber direction, 1...intermediate product, 2...spreader 13a, 3b...suction head, 4a, 4b...
Transfer robot, 5...belt conveyor, 6...cold press. Patent applicant: Hashimoto Electric Industry Co., Ltd. F1, 82 N, Mi 2 F2. Bl Figure 8 Figure 9 Procedural official document (voluntarily submitted) July 12, 1988 Director General of the Patent Office Kunio Ogawa 2 Title of invention Method for manufacturing veneer laminates 3 Person making the amendment - Relationship to the incident Patent applicant address 1-13 Rusakushinden, Yoshihama-cho, Takahama-shi, Aichi Prefecture
The “Detailed Description of the Invention” column of the specification. 5. Contents of amendment (1) Page 3 of the specification, line 11, page 12, line 5
Page 20, page 8, line 14, page 8, line 15, page 9, line 3, page 11, line 14, page 13, line 20, page 14, line 1, page 15, line Correct it to "2 layers". (2) "The above-mentioned front plate, back plate, and middle plate" described in page 7, line 17 of the specification is amended to read "the above-mentioned 2@'s worth of front plate and 2 layers' worth of back plate."that's all

Claims (1)

[Claims] 1. A fiber whose standard length (l) is an integer fraction of the structure length (a), and the length (S) of the scarf slope is added to the standard length (l). The first layer of the top plate (F
1) and preparing the second layer of the back plate (B2), and preparing the first layer of the front plate (F1) and the second layer of the back plate (B2) to an integer fraction of the construction length (a). The standard length (l') is the integer divided by adding or subtracting 1 to the integer when divided into the standard length (l), and the length of the scarf slope is added to the standard length (l'). The predetermined length (l'+S') in the fiber direction is the sum of the length (S')
), preparing a second layer of the front plate (F2) and a first layer of the back plate (B1), and a direction orthogonal to the fiber direction of the mesh, which is slightly shorter than an integer fraction of the structure length (a). The core plate (C) is prepared to have a predetermined width (W), and the predetermined length (l+S
, l'+S')
Layer (F1, F2) and first and second layer of backing board (B1, B2)
The adhesive is applied to the required board surfaces, and the adhesive is laminated one after another in a scarf joint-shaped staggered manner up to the length (a), and the direction perpendicular to the fiber direction is applied to the predetermined width (W). Apply adhesive to the required plate surfaces of the prepared core plate (C), and sequentially stack them in a butt joint type staggered stack with a slight gap to the length (a), as follows. Intermediate product (1) with a predetermined structure length (a) and laminated with an appropriate number of plies and an appropriate number of sheets.
A method for producing a veneer laminate, characterized by temporarily bonding the veneer laminates by cold-pressing them all at once. 2. Spreader with intermittent control for adhesive application (2)
A method for producing a veneer laminate according to claim 1, wherein the method uses: 3. Suction heads (3a, 3b) were attached to the structure of the first and second layers of the front plate (F1, F2), the first and second layers of the back plate (B1, B2), and the core plate (C). Transfer robot (4a, 4
2. The method for producing a veneer laminate according to claim 1, wherein b) is used. 4. Appropriate number of plies and predetermined length of laminated layers (
2. The method for producing a veneer laminate according to claim 1, wherein a) a cold press (6) equipped with a belt conveyor (5) is used for cold pressing one load of the intermediate product (1).