JPS61154834A - Hollow laminate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a laminate having a hollow portion inside, and is particularly applicable to veneers cut to a small thickness using a veneer cutting machine such as a veneer lace or a veneer slicer. This invention relates to a core in which veneers are laminated with their fiber directions intersecting each other and bonded to a thin plywood board that can be folded to form a continuous trapezoidal cross section.

"Prior Art" Various laminates have been developed and proposed in which a core is formed by appropriately processing wood boards, veneer veneers, paper, synthetic resins, etc., and the interior is hollow. In general, this type of laminate is lighter in weight than other laminates, and has excellent air insulation and soundproofing properties due to the hollow part, but on the other hand, it has poor bending, torsion, and compressive strength. It tends to be inferior.

For example, in the case where wooden boards divided into long strips are used as crosspieces in the core part, and these crosspieces are divided and arranged in the width direction between the upper and lower members, there is nothing intervening between the rows of crosspieces to support the upper and lower members. Therefore, the torsional and bending strength is weak,
Furthermore, the hollow portion lacks compressive strength.

In addition, when using a veneer veneer as a core, the properties of the veneer veneer to be cut differ depending on the grade of the raw wood, cutting conditions, etc., and the veneer itself has a certain degree of directionality due to its fibers. However, since it is extremely fragile, it is processed into a tubular or lattice shape and joined between the upper and lower members. However, if the clamping force becomes excessive during this joining,
It becomes difficult for the fibers to be deformed to form the desired hollow portions, and ultimately the fibers will break.

On the other hand, if the clamping force is too low, it will not only cause problems in the manufacturing stage such as poor adhesion, but also reduce the strength of the core.
It is poor in bending, twisting, etc., and has the disadvantage that the compressive strength varies even within a single laminate due to differences in the individual veneer veneers.

Furthermore, when paper processed into a honeycomb shape or roll core shape is used as the core, the paper itself is made of defibrated wood fibers, so compared to the veneer veneer described above, the fiber directionality is lost, but , machining becomes easy. However, since the strength of the core portion is significantly reduced, the materials of the upper and lower members, their weight, and the intended use are limited.

Furthermore, if the core is made of non-woody synthetic resin, it will be easier to manufacture, but it will be brittle against twisting and bending strength, and there will be difficulties in cutting, sawing, etc. The uses will also inevitably be limited.

"Problems to be Solved by the Invention" In view of the above, the present invention provides air insulation, sound insulation, and
Not only is it expected to be lighter, but it also improves bending, torsion, and compressive strength, and facilitates product processability such as cutting and sawing.Furthermore, the material of the upper and lower parts can be made optional, expanding the range of uses. The aim is to

"Example" Below, an example of the present invention will be described based on the accompanying drawings.

Generally, plywood 3 is made by applying adhesive 2 to a plurality of veneer veneers 1 and laminating and bonding them with their fiber directions crossing each other. It is recognized that it has a certain straightness and rigidity by getting rid of the straightness and obtaining directionality in the vertical and horizontal directions. It has been widely used in various applications that require

Therefore, the plywood 3 is manufactured with the aim of maintaining at least its straightness, and as a result, its minimum thickness is currently determined to be approximately 2.5 mm.

In the present invention, we broke away from the conventional understanding of plywood 3 and focused on producing a thin plywood 3 that has mechanical strength in the vertical and horizontal directions, but ignores a certain rigidity and is bendable. be.

Then, the fiber directions of the veneer veneer 1 are crossed and laminated and bonded to form a thin plywood 3, which is sequentially bent so that the horizontal surface portion 4 and the slope portion 5 are formed alternately at arbitrary intervals.
Processing is performed so that the cross section becomes a continuous trapezoidal shape 6.

At this time, at each corner 7 moving from the horizontal surface part 4 to the slope part 5, or conversely from the slope part 5 to the horizontal surface part 4, the fibers of the outer layer of the veneer veneer l of each layer are stretched. However, conversely, the inner layer is subject to stress that causes the fibers to shrink.

However, if the adhesive 2 is a thin plywood 3 that is still in a semi-gelled state, the fibers of each layer of veneer veneer 1 at each corner 7 will not be restrained from expanding or contracting by the adhesive 2, and the stress will be reduced. Since it is absorbed, processing into the trapezoidal shape 6 becomes easy.

Next, the trapezoidal 6 thin plywood 3 is physically fixed to each horizontal surface portion 4 alternately located above and below with a stapler or the like, with the front surface member 8 and the back surface member 9 interposed therebetween, or as shown in the figure. An adhesive 2 is applied and the upper and lower sides are bonded to obtain an integrated hollow laminate 10.

According to this hollow laminate 10, since the surface member 8 and the back member 9 and each horizontal surface portion 4 have joints over a certain range, a firm joint base is obtained.
Not only does it have excellent torsion and bending strength in the longitudinal direction, but even when a compressive load is applied in a direction perpendicular to this, each horizontal surface part 4 and slope part 5 are continuously processed from thin plywood 3. Therefore, even if a compressive load is applied to one slope portion 5 having a trapezoidal cross section 6, it will be offset by the tensile strength generated as a reaction on the other slope portion 5 via the horizontal surface portion 4. , has durable strength.

The spacing between the core layers of this hollow laminate 10 can be varied by determining the height of the trapezoid 6 depending on the intended use, and the bending, torsional, and compressive strengths required depending on the intended use. This can be handled by appropriately adjusting the density of each pitch of the continuous trapezoidal shapes 6.

The materials of the front surface member 8 and the back surface member 9 include general purpose board, formwork plywood, hardboard, particle board, etc., or wood materials overlaid with traps such as veneer or decorative paper, plaster, cement, etc. or an inorganic material overlaid with decorative paper, metal foil, etc., as long as it can be processed according to its intended use.

For example, in FIG. 5, among the wood materials mentioned above, formwork plywood 11
Hollow laminate 1 with specified surface member 8 and back member 9
0 is shown, and according to this hollow laminate 10, in addition to the plate strength of the formwork plywood 11, bending, torsion, and compressive strength can be obtained due to the trapezoidal 6 thin plywood 3 interposed in the hollow core. . In addition, if instead of this thick formwork plywood 11, and 2.5 inch thin general-purpose boards are used for the front surface member 8 and back surface member 9, construction materials such as wall materials, partitions, doors, etc. Of course, the desk,
It can be used in a wide range of furniture materials such as low tables, and has excellent workability.

In addition, in the case shown in FIG. 6, the front member 8 and the back member 9 are made of gypsum board (2) among the above-mentioned inorganic materials, and it is used for ceiling panels and wall materials for the purpose of flame retardancy. According to this hollow laminate 10, the gypsum board 12
has no directionality and is fragile, but the trapezoidal thin plywood 3 interposed in the hollow core provides strength, making handling, sawing, construction, and other operations at construction sites easier.

``Effects of the Invention'' As described above, according to the present invention, a plurality of veneer veneers are laminated with their fiber directions crossing each other, and while being adhered to a bendable thin plywood, the horizontal surface portion and the slope portion are alternately formed. The cross section is processed to have a continuous trapezoidal shape, as shown in the figure, and the horizontal plane parts located alternately above and below are sandwiched and integrated between the facing surface member and back surface member, so that the core Not only can the hollow part of the layer provide air insulation, soundproofing, and weight reduction,
The continuous trapezoidal thin plywood provides mechanical strength in the cross direction.

In addition, since the trapezoidal slopes are continuous with each other via the horizontal surface, it is possible to create a hollow laminate with excellent bending, twisting, and compressive strength. By appropriately adjusting the density of the hollow laminate and selecting the materials for the front and back members, it is possible to manufacture any hollow laminate depending on the intended use.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the plywood bonding process, FIG. 2 is a perspective view of plywood, FIG. 3 is a perspective view of trapezoidal thin plywood, and FIG. 4 is a perspective view showing an embodiment of the present invention. FIG. 5 is a front view showing another embodiment of the invention, and FIG. 6 is a front view showing another embodiment of the invention. 1...Plywood veneer, 2...Adhesive, 3...Thin plywood,
4...Horizontal surface portion, 5.Slope portion, 6...Trapezoidal shape, 7.
・・Corner, 8・・Surface member, 9・・Back member, 10・
...Hollow laminate, 11...Form plywood, 12...Gypsum board, 5 wide ~

Claims (1)

[Claims] Multiple veneer veneers are laminated with the fiber directions crossing each other and bonded to a thin plywood board with a thickness that allows it to be bent.
The cross section is processed into a continuous trapezoid so that the horizontal plane parts and the slope parts are formed alternately at arbitrary intervals, and each horizontal plane part located alternately above and below is placed between the facing surface member and the back surface member. A hollow laminate characterized by being integrated by being sandwiched between.