JPH0334441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing plywood in which small width veneers generated in the plywood manufacturing process are used as core veneers without being joined.

Traditionally, small-width veneers generated in the plywood manufacturing process are put through a jointer and assembled to a specified width, and then glued together to make a wide single veneer.
Alternatively, the narrow veneers that come out of the dryer are assembled to a specified width and then put through a jointer to be spliced together. However, the treatment of these narrow veneers is the biggest problem in the plywood manufacturing process. How to process these narrow veneers in a rational manner is related to the yield of plywood logs, and also has a large impact on manufacturing costs.

The present invention utilizes the narrow veneer efficiently by combining such narrow veneers into a single wide veneer without joining them and using it as a core veneer. The object of the present invention is to provide a method for manufacturing plywood that is streamlined and simplified.

That is, the present invention is characterized in that the veneer is cut in advance into one or more predetermined shapes so as to be combined on the same plane to form a single wide veneer, and two or more circular holes are punched at predetermined positions. A plurality of unit small-width veneers for the center core are inserted into a locking rod for position fixing that is fixed at a predetermined position for each unit narrow-width veneer for the center core of the narrow-width veneer combination stacking device, and the position is fixed. One or more layers of the one-piece wide veneer stacked on the veneer stack plate through which the locking rod passes and are combined with the one or more types of core unit narrow veneers. Then, using a suction and moving device having a suction mechanism, the single wide veneer is adsorbed one layer at a time from the top layer, and moved while maintaining the combined state, and is then transferred to other wide veneers coated with adhesive. The present invention relates to a method for manufacturing plywood, which comprises stacking and assembling a board into a predetermined plywood structure and then hot-pressing the plywood.

Hereinafter, the present invention will be explained in detail with reference to the drawings.
FIGS. 1, 2, 3, and 4 are explanatory diagrams each showing an example of a state in which each core unit narrow-width veneer cut to a predetermined size is combined into a single wide-width veneer, FIG. 5 is an explanatory side view showing an example of a narrow width veneer combination deposition apparatus, and FIG. 6 is an explanatory plan view of the apparatus shown in FIG.

The unit narrow-width veneers for the core used in the present invention are obtained by drying narrow-width veneers of various sizes and shapes (hereinafter sometimes referred to as generated narrow-width veneers) generated in the conventional plywood manufacturing process. use.

Next, this dried generated narrow width veneer is pre-cut into a predetermined shape according to its size and shape, and two or more circular holes are punched at predetermined positions to obtain a unit narrow width veneer for the core. The above-mentioned predetermined shape is a shape that utilizes each of the small width veneers of various sizes and shapes as effectively as possible, and one or more types of center core unit small width veneers manufactured in this way. The shape is set so that a single wide veneer can be constructed by combining multiple boards on the same plane.

In this way, the predetermined shape of each of the plurality of core unit narrow width veneers constituting a single wide width veneer can be appropriately set depending on the size and shape of the generated narrow width veneers. Next, an example of a single wide veneer in which a plurality of core unit small width veneers having various predetermined shapes are combined will be described. The example of a single wide veneer 1 shown in FIG. 1 is one that uses a relatively large narrow width veneer, and consists of two veneers of one type each with two circular holes 12 perforated at predetermined positions. It is composed of a unit small-width single plate 11 for the center core. Similarly, examples of the single-piece wide veneer 1 shown in FIGS. 2, 3, and 4 are unit small-width veneers for the center core consisting of 3 pieces of 2nd type, 4 pieces of 3rd type, and 4 pieces of 2nd type, respectively. 11, and when using a small generated narrow width veneer, one set of core unit narrow width veneers 1 constitutes a single wide width veneer 1.
The number of 1s will increase. As seen in the examples in the above figures, in the present invention, part or all of the plurality of core unit narrow width veneers constituting a single wide width veneer may be of the same shape and the same type. Moreover, the shape can be a rectangle, a square, or any other shape such as a quadrilateral.

A plurality of such one or more types of core unit narrow width veneers are prepared, and a narrow width veneer combination deposition device (hereinafter sometimes abbreviated as deposition device) 2 is prepared.
is used to form one layer of a single wide veneer. As an example is shown in FIGS. 5 and 6, the deposition device 2 includes a position fixing locking rod 21, a veneer stacking plate 22 through which the position fixing locking rod 21 passes, and a position fixing lock. It mainly consists of a support base 23 to which a rod 21 is fixed at its lower end. The position where the position fixing locking rod 21 is fixed to the support base 23 is determined by the position when one or more types of core unit narrow width veneers 11 are combined into a single wide width veneer 1. This corresponds to the position of the circular hole 12 of the plurality of unit small-width veneers 11 for the center core, that is, the locking rod 21 for position fixing corresponds to the position of the circular hole 12 of the plurality of unit narrow-width veneers 1 for the center core.
It is fixed at a predetermined position for each one. Therefore, using such a stacking device 2, one or more of the same number of veneers are extrapolated for each center core unit narrow width veneer 11, with the locking rod 21 for position fixing corresponding to the position. When deposited on the stacking plate 22, each core unit small width veneer 11 is moved to the locking rod 21 for fixing the position.
is locked and fixed in a predetermined position, where one or more layers of the single wide veneer 1 are inserted into the locking rod 21 for position fixing. The same number of objects are automatically formed.

Next, a suction moving device (not shown) having a suction mechanism adsorbs the top layer of the single wide veneer 1 formed on the veneer stacking plate 22 of the stacking device 2 to form two or more cores. The unit small width veneers 11 are moved while maintaining the assembled state as is. Then, the adsorption is released at a predetermined location, and the plywood is mechanically deposited on another single wide veneer coated with adhesive in a predetermined plywood configuration, and then hot-pressed according to a conventional method to obtain plywood. After the first single wide veneer 1 on the veneer stack plate 22 is attracted and moved, the second single wide veneer 1 becomes the top layer, and the above-mentioned suction, movement, etc. It is possible to manufacture plywood one after another by repeating the process. The level of the top layer of the single wide veneer 1 formed and deposited on the veneer deposition plate 22 of the deposition device 2 in this way does not necessarily have to be constant. However, in order to facilitate operations such as suction and movement using a suction device, it is preferable to always maintain the top layer of the single wide veneer 1 at a constant level. Therefore, as the deposition device 2, a device in which the veneer deposition plate 22 is movable in the vertical direction while sliding in the through hole 22a along the locking rod 21 for position fixing is used, and one or more types of A locking rod 2 for fixing one or more of the core unit small width veneers 11 in position.
1, the veneer stacking plate 22 is moved vertically to position the single wide veneer 1 on the top layer at a certain level, and the veneer stack 22 is sucked and moved from the top layer by the suction device. As the number of layers of wide veneers 1 decreases, it is preferable to move the veneer stacking plate 22 upward to maintain the level of the top layer of wide veneers 1 at a constant level. The method of moving the veneer stacking plate 22 in the vertical direction in this manner can be performed using known means.

The method of the present invention has the following effects. That is, in the obtained plywood, the plurality of core unit small width veneers that constitute a single wide veneer used as a core are set to constitute a single wide veneer. Because it is pre-cut into one or more predetermined shapes, the dimensional accuracy is extremely good, and when assembled into a single wide veneer, the adjacent core unit small width veneer The end surfaces of the plates are in good contact, and tunnels and core overlaps do not occur. Therefore, it is not necessary to bond the narrow width veneers at the end faces with an adhesive, which was done when conventional narrow width veneers were used. In addition, the combination of multiple core unit small-width veneers can be done by simply inserting them onto the locking rod for fixing the position, and the single wide veneer formed by combining them can be moved by adsorption and movement. The assembled state can be easily maintained and transferred to the next plywood construction process. Therefore, the manufacturing process is greatly streamlined and simplified. Since the circular holes drilled in the core unit small-width veneer are present only in the core of the plywood, there is no substantial problem in terms of the quality of the plywood. In addition, since various shapes such as squares, rectangles, and quadrilaterals of arbitrary shapes are preset as the shape of the unit small-width veneer for the center core, each narrow-width veneer that is generated in the conventional plywood manufacturing process can be set in advance. However, by selecting a shape that makes effective use of it, cutting it into that shape, and using it as a unit narrow-width veneer for the core, the generated narrow-width veneer can be used efficiently and contribute to improving log yield. be able to.

The present invention will be further explained below with reference to Examples.

Example 1 A small width veneer of lauan wood with a thickness of 5.5 mm was cut into rectangles of 930 mm wide and 350 mm long, and 930 mm wide x 550 mm long, and each cut piece was cut on the same line in the direction orthogonal to the wood fiber direction. Two types of core unit small width veneers were made by drilling two circular holes with a diameter of 10 mm at a center spacing of 300 mm, and each of these two pieces was made into a single wide veneer with the same structure as shown in Figure 4. The small-width unit has the same structure as shown in Figures 5 and 6, except that the locking rod for position fixing is fixed at the position corresponding to the circular hole of each unit narrow-width veneer for the center core when combined. Use the plate combination stacking device to attach the above 2 to the locking rod for fixing the position.
Extrapolate two small-width veneers for the center core of each type and place them on the veneer stack with a width of 1860 mm and a length similar to that shown in Figure 4.
A single wide veneer with a dimension of 900 mm was formed. Next, the single wide veneer was moved and stacked on a 1.2 mm thick lauan wide veneer with a suction mechanism and stacked on top of a 1.2 mm thick lauan material coated with urea resin adhesive on one side. After unraveling, a wide veneer of lauan material with a thickness of 1.2 mm coated with the same adhesive as above was layered in the same manner and then hot pressed to obtain a 3-ply plywood with a thickness of 7.5 mm.

The above manufacturing can be carried out very easily,
The obtained plywood was of good quality, with no core overlap or tunnels in the central core.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, and 4 are explanatory diagrams each showing an example of a state in which each core unit narrow-width veneer cut to a predetermined size is combined into a single wide-width veneer, Figure 5 shows one of the small-width veneer combination deposition devices.
FIG. 6 is a side view showing an example, and FIG. 6 is a plan view of the apparatus shown in FIG. DESCRIPTION OF SYMBOLS 1...Single wide veneer, 11...Unit small width veneer for center core, 12...Circular hole, 2...Narrow width veneer combination stacking device, 21...Locking rod for position fixing, 2
2...Single plate stack plate, 22a...Through hole, 23...
Support base.

Claims (1)

[Scope of Claims] 1. Cut in advance into one or more predetermined shapes so as to be combined on the same plane to form a single wide veneer, and with two or more circular holes at predetermined positions. A plurality of perforated unit small-width core core veneers are inserted into position fixing locking rods that are fixed at predetermined positions for each core core unit narrow-width veneer of the narrow-width veneer combination stacking device. One layer of the single wide veneer in which the one or more types of core unit narrow veneers are combined by being deposited on the veneer stacking plate through which the locking rod for position fixing passes. Form the above,
Next, a suction and movement device having a suction mechanism adsorbs the single wide veneer one layer at a time from the top layer, and moves it while maintaining the combined state to a predetermined position with other wide veneers coated with adhesive. A method for producing plywood, which comprises stacking and arranging it into a plywood structure, followed by hot pressing. 2. As a narrow-width veneer combination stacking device, use one in which the veneer stacking plate is movable in the vertical direction along a locking rod for position fixing, and each core unit narrow-width veneer is stacked on the movable veneer stacking plate. The top layer of the single wide veneer formed by stacking on top is positioned at a certain level, and the single wide veneer is attracted and moved from the upper layer, and as the number of layers decreases, the veneer is deposited. 2. The method for manufacturing plywood according to claim 1, wherein the top layer of the single wide veneer is always maintained at a constant level by moving the board upward.