JPS63272501A - Manufacture of reticulate continuous fiber laminated material - 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] Industrial Field of Application This invention is a method for manufacturing a reticulated continuous fiber laminate, in which reticulated continuous fibers obtained by rolling and splitting unshaped wood with a roller are coated with an adhesive and laminated and pressed together. More specifically, the present invention relates to a manufacturing method suitable for obtaining a high-strength reticulated continuous fiber laminate material.

Conventional technology As a technology to effectively utilize irregular-shaped wood such as offcuts and thinned wood that are generated when sawing raw wood to make pillars and boards, the irregular-shaped wood is turned into small pieces using a chipper and turned into these chips. A method of manufacturing a chip integrated board by gluing and applying pressure is known. However, since each chip in this type of chip integrated board is a small piece, the board as a whole has a problem of insufficient strength.

Therefore, as an alternative to chip integrated boards.

Reticulated continuous fiber laminate materials have been developed and are coming into practical use. Conventional reticular continuous fiber laminates are made by coarsely splitting unshaped wood in the longitudinal direction, then rolling it between rolls to split it finely into long reticulated continuous fibers, and drying the reticulated continuous fibers. After that, apply adhesive and laminate.
Manufactured by compression bonding using a thermocompression bonding device, etc.

Problems to be Solved by the Invention Since the reticulated continuous fiber laminate is composed of long fiber bundles, it has higher strength than a chip integrated board. but,
Traditional manufacturing methods are not sufficient to produce reticulated continuous fiber laminates with higher strength. In particular, with conventional manufacturing methods, even one reticular continuous fiber laminate may have uneven strength depending on location. The cause of this is
Possible reasons are as follows.

In the adhesive application step, the adhesive is atomized and sprayed onto the continuous reticulated fibers using, for example, an airless spray device, so that the adhesive is evenly applied to the entire reticulated continuous fibers obtained by splitting the fibers. The reticulated continuous fiber obtained by rolling and splitting with a roller has many voids between the fibers, and the sprayed adhesive enters these voids, coating the entire reticulated continuous fiber. be done.

However, in the reticulated continuous fiber immediately after splitting, there are many places where the fibers are in contact with each other. It is difficult for the adhesive to penetrate between the fibers that are in contact with each other, resulting in some areas where the adhesive is not applied. Therefore, this appears as unevenness in the strength of the reticulated continuous fiber laminate, and in severe cases, voids remain in the product, significantly reducing its commercial value.

Purpose of the Invention The present invention has been made in view of the problems inherent in the above-mentioned prior art.
This invention has been proposed to suitably solve this problem, and aims to provide a method for manufacturing a reticular continuous fiber laminate material with high strength and uniform radius.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, in the present invention, wood is rolled between vertically opposing rolls and split vertically into long pieces. A splitting process to obtain continuous network fibers, a drying process to dry the continuous network fibers obtained in this splitting process, an adhesive application process to apply an adhesive to the continuous network fibers dried in this drying process, and a process for applying adhesive to the continuous network fibers. In a method for producing a reticulated continuous fiber laminate material comprising a hot pressing step of laminating and compressing reticular continuous fibers coated with an adhesive in an adhesive application step, between the splitting step and the drying step,
It is characterized by providing a humidification step for humidifying the reticular continuous fibers.

Function By humidifying the reticulated continuous fibers before the drying process,
As each fiber absorbs moisture and dries, it warps significantly, causing the fibers that were in contact to separate from each other. Therefore, in the subsequent adhesive application process, the adhesive is sufficiently applied to the core of each fiber constituting the continuous network fibers, and the strength of the continuous network fiber laminate obtained by laminating and pressing these fibers is high and uniform. .

EXAMPLE Next, a method for manufacturing a reticulated continuous fiber laminate according to the present invention will be described by way of a preferred example with reference to the accompanying drawings.

FIG. 2 is an explanatory diagram of the splitting process of the method for producing the reticular continuous fiber laminate material. A raw material 1, which is obtained by roughly dividing scraps or thinned wood of a predetermined length to a required thickness of, for example, 2 to 3a+1), is rolled between vertically opposing rollers 2 and 3. Although only a pair of rollers 2 and 3 are shown in FIG. 2, in reality,
Using a large number of roller pairs, for example, 5 to 30, the raw material 1
is sequentially rolled with each pair of rollers to form a squid shape. As a result, the raw material 1 is finely split in the longitudinal direction to form long reticulated continuous fibers 4. The type of wood used as raw material 1 does not matter, but if hardwood or dried wood is softened by steaming in advance, it will be easier to split it into 10% pieces.

Next, as shown in FIG. 1, water is sprayed onto the reticular continuous fibers 4 to humidify them. When humidifying the reticular continuous fibers 4, water may be sprayed as shown in FIG. 1, but as shown in FIG.
It may be soaked in water in the water tank 5. After this humidification step, if necessary, the reticulated continuous fibers 4 are dried after draining. If this drying is carried out gradually by natural drying, the degree of deformation of the fibers is small and the effect of the present invention is small. Therefore, dry it as quickly as possible. Since the reticular continuous fibers 4 are fine fibrous,
For example, when high-temperature hot air permeation drying is applied, the moisture content quickly decreases. In this way, by providing a humidification process before the drying process, each fiber constituting the reticular continuous fiber 4 is broken apart and greatly warped, and the parts where the fibers were in contact with each other are separated and voids are formed.6 Drying In the adhesive application process after the process, for example, airless
The adhesive is sprayed onto the reticulated continuous fibers using a spray device. Due to the humidification process and drying process described above, each fiber of the reticular continuous fibers is separated and voids are formed, so that the adhesive is applied over the entire core of the fibers. A reticulated continuous fiber laminate is manufactured by laminating and forming several layers of the reticulated continuous fibers coated with the adhesive in this way and compressing them using a heat-pressing device (hot press process).

During forming, if the fiber directions of each layer are orthogonal as in plywood, a reticulated continuous fiber laminate as shown in FIG. 4 can be obtained. FIG. 4 is a perspective view of a reticular continuous fiber laminate manufactured by stacking three layers of reticular continuous fibers 4 alternately. Furthermore, by making the fiber directions of each layer parallel during forming, a laminated material similar to natural wood can be obtained. By changing the clamping pressure during compression using a thermopressure device, products with different specific gravities can be manufactured. When manufacturing reticulated continuous fiber laminate materials for use in insulation materials, sound absorbing materials, roof base materials, etc., the compacting pressure is reduced to produce materials with low specific gravity. When manufacturing reticulated continuous fiber laminate materials used for structural panels, floorboards, furniture materials, etc., the compacting pressure is increased to produce high specific gravity materials, and for other decorative materials, etc., materials with medium specific gravity are used. For example, in the case of Japanese cypress, a strength comparable to that of structural plywood can be obtained with a specific gravity of about 0.7.

In this example, when manufacturing the various laminated materials mentioned above,
Since the adhesive is applied to the entire core of the reticulated continuous fibers, the strength of the laminated material is even and uniform, and no voids remain in the product. Due to the nature of the reticulated continuous fibers, the reticulated continuous fiber laminate material can be easily subjected to chemical decoration treatments such as dyeing, flame retardant treatment, and WPC conversion, and can also be molded by embossing in the hot press process, resulting in added value. It is possible to produce laminated materials with high Therefore, as described in the Examples, by providing a humidification process before the drying process, it is possible to produce a laminate with even higher commercial value.

In the above-mentioned embodiment, although the reticulated continuous fibers were simply humidified in the humidification step, a reticulated continuous fiber laminate having sufficiently high strength and uniform strength can be produced.

However, if adhesive is mixed into the humidifying water during this humidification process, even if adhesive application is uneven or leaks due to some reason during the adhesive application process, the leaked area will be covered. Since a certain amount of adhesive has already been applied during the humidification process, the occurrence of defective products can be avoided. In addition, even if the constituent fibers of the reticulated continuous fibers come into contact with each other over a wide area after the drying process, the contact area is coated with the contacting agent during the humidification process.
This avoids situations where strength unevenness or voids remain.

Furthermore, it is preferable to mix wax into the water during humidification, as this will improve the dimensional stability of the product and reduce the swelling rate and moisture absorption rate. The wax used here is
Any suitable liquid wax may be used, such as an emulsified form of paraffin wax. When this type of emulsified paraffin is attached to the reticular continuous fibers, it is possible to reduce the amount of adhesive used. The wax-impregnated reticulated continuous fiber laminate is such that the presence of the wax increases the resistance of the final product to water ingress and improves the durability of the resulting product in use.

It is also conceivable to mix various pigments into the water during humidification to dye the reticular continuous fibers. This has the advantage of being able to easily and economically obtain colors close to the primary colors that are preferred by young people these days.

Effects of the Invention According to the present invention, in the method for producing a reticulated continuous fiber laminate material, a humidification step is provided before the drying step so that the adhesive is applied to the entire fiber core of each reticulated continuous fiber in the adhesive application step. Therefore, it is possible to obtain a reticulated continuous fiber laminate with high commercial value without any unevenness in strength or residual voids.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the humidification process of a method for producing a reticulated continuous fiber laminate according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the splitting process, and FIG. 3 is a humidification method different from the method shown in FIG. 1. FIG. 4 is a perspective view of a three-layer reticular continuous fiber laminate. 1... Raw material 2, 3... Roller 4...
・Reticular continuous fiber 5...Aquarium patent applicant Iida Kogyo Co., Ltd. FIG, 2 FIG, 4 (No subsequent drawing) FIG, 3

Claims (1)

[Scope of Claims] [1] Splitting process for obtaining long reticulated continuous fiber bundles by rolling wood between vertically opposing rolls and splitting it finely in the longitudinal direction, and reticular continuous fibers obtained in this splitting process. a drying process in which the reticulated continuous fibers are dried, an adhesive application process in which an adhesive is applied to the reticulated continuous fibers dried in this drying process, and a hot process in which the reticulated continuous fibers coated with adhesive are laminated and pressed together in this adhesive application process. A method for producing a reticulated continuous fiber laminate comprising a pressing step, the method comprising: a humidifying step of humidifying the reticulated continuous fibers between the splitting step and the drying step. . [2] The method for producing a reticulated continuous fiber laminate material according to claim 1, characterized in that an adhesive is mixed in the water used in the humidification step.