JP2000034800A - Soft foamed fiber plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft foamed fiber plate with a lighter weight which resolves VOC problems and improves in temperature retaining performance and sound absorbing characteristic. SOLUTION: A soft foamed fiber plate 1 which is formed of wood fibers 2 and polyolefin based thermoplastic resin cullets 3 as raw materials in a foaming and molding method using physical foaming agent is manufactured by mixing the wood fibers 2 crushed into rod chips with resin foaming body for foaming mold in an extrusion foaming method using the physical foaming agent and cutting into specified forms. In this case, the wood fibers 2 and the polyolefin based thermoplastic resin cullets 3 are obtained by recycling industrial waste including wood frames and cured films of glasses or others, resulting in pollution issues and cost related problems to be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft fiberboard, and more particularly to a lightweight soft foamed fiberboard having excellent heat insulation and sound insulation properties and solving the VOC problem.

[0002]

2. Description of the Related Art As shown in FIG. 4, recent wood-based materials generally include a fiberboard 22 formed by using a wood fiber 20 as a raw material and adding a water resistant agent and an adhesive 21 thereto.
The fiberboard 22 is classified by its bulk specific gravity,
Those with a weight of kg / l are called soft fiberboard. This soft fiber board is mainly used for heat insulation or sound absorption, and is also used for tatami floors. However, the current soft fiber board has a bulk specific gravity of 0.4 kg / l, a thermal conductivity of 0.55 W / m · K, and a weight and a thermal conductivity of 10 5 compared to an organic foamed heat insulator such as polystyrene foam. It is inferior by a factor of two, and the heat retention performance is not always high. In addition, volatile organic substances such as formaldehyde generated from the adhesive (VO)
It has been pointed out that C) has an adverse effect on the human body, and a problematic situation has actually occurred.

The background of the occurrence of such sick building syndrome includes the development and spread of organic polymer materials and the improvement of the airtightness of buildings with the aim of providing a comfortable living environment. Under such circumstances, global environmental issues have been highlighted again in the construction industry, starting with the sale of healthy homes that use human-friendly interior materials as a catchphrase. Since the current soft fiberboard uses an adhesive as a binder as described above, it is not irrelevant to the VOC problem and an improvement measure must be pursued.

On the other hand, with the enforcement of the Recycling Law, recycling is being promoted in the industrial world, and from the viewpoint of preventing global warming and the generation of dioxins, incineration of industrial waste is also free. Under no circumstances. Therefore, it has reached the stage of promoting recycling of interior finishing materials including soft fiber boards and finishing base materials.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible foamed fiberboard which solves the VOC problem, improves the heat insulation performance and the sound absorption characteristics, and reduces the weight.

[0006]

The flexible foamed fiberboard according to the present invention is made of wood fiber and a polyolefin-based thermoplastic resin cullet as raw materials and is foam-formed using a physical foaming agent. The method is performed by mixing crushed wood fibers with a resin foam, subjecting the mixture to foam molding by an extrusion foaming method using a physical foaming agent, and then cutting out to a predetermined shape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flexible foamed fiberboard 1 according to the present invention.
As shown in FIG. 1, wood fiber 2 and polyolefin-based thermoplastic resin cullet 3 are used as raw materials,
The material 7 to be processed is formed by adding the physical foaming agent 5 and foaming. The material 7 is cut into a predetermined size to obtain a floor base material or a core material 7 for a sound absorbing panel.
It is appropriately processed and finally commercialized.

The wood fibers 2 are mainly obtained from tropical materials, but include recycled materials of wood wastes such as plywood form materials selected from industrial waste and municipal waste, and shavings from wood factories. Can be adopted. The raw material of the wood fiber 2 is obtained by pulverizing the above wood into rod-shaped chips having an apparent specific gravity of 0.8 kg / l, a particle diameter of 1 to 3 mm, and a length of about 3 to 5 mm.

As the other raw material, the polyolefin-based thermoplastic resin cullet 3, a thermoplastic resin such as polyethylene, polypropylene, vinyl chloride or the like is used. The manufacturing process is formed as a resin foam 4 foamed about 20 times.

[0010] Polyolefin-based thermoplastic resins can also be handled by reusing industrial waste. That is, since a molded product of a polyolefin-based thermoplastic resin used as a curing film such as a glass and a sash is discarded from a new construction site of a building, the molded product can be separated and used as a raw material of the resin foam 4. is there. In addition, the evaporation type foaming agent is
Also known as a physical blowing agent 5, which is 50 to 100 at room temperature such as a saturated hydrocarbon type, a fluorine type and a chlorine type.
Uses hydrocarbons that become gas at ° C.

Since the flexible foamed fiberboard 1 is commercialized as a base material for a floor or a core material of a sound absorbing panel, the bending strength and the toughness are adjusted according to the use. For example, in the case where the main purpose is to reduce the weight of the base material for floors or the core material of the sound-absorbing panel, the composition is determined by volume ratio of wood fiber: resin foam =
1: 0.5 to 2, wood fiber + resin foam: air =
It is manufactured by foaming in the range of 1: 5 to 20.
In addition to this, when strength and rigidity to failure are required,
If the expansion ratio of the resin foam is lowered to increase the bending strength, or if the deformability is required in a thin plate, it will be dealt with by increasing the compounding ratio of the resin foam to the wood fiber to increase the toughness, It is possible to respond to various demands for commercial boards by changing the composition.

Next, a method for producing a flexible foamed fiberboard according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining the first stage of the manufacturing process. First, the production of the flexible foamed fiberboard 1 is performed by using a polyolefin-based thermoplastic resin 3.
Is started by producing a resin foam 4 by adding a physical foaming agent 5 to the raw material and foaming it by about 5 to 20 times. At this stage, the addition ratio and the foaming ratio are adjusted in order to set the rigidity, bending strength and toughness of the extruded material 7 to predetermined values according to the application to be commercialized. In the second manufacturing process, the resin foam 4 is transferred to the melting pot 8 and sufficiently melted, and the apparent specific gravity is 0.8 kg / l, the particle size is 1 to 3 mm, and the length is in the molten resin foam 4. This is a step of producing a uniform mixture 6 by mixing and agitating the crushed wood fiber 2 into a rod-shaped chip of about 3 to 5 mm. Also in this step, the mixing ratio of the wood fiber and the resin foam is adjusted by the volume ratio so as to maintain predetermined characteristics.

In a third manufacturing step in the latter half of the manufacturing step shown in FIG. 2, the uniform mixture 6 is charged into a high-pressure extruder 9,
While supplying air 10, high pressure is applied to adjust the ratio of pressurizing air into the mixture 6. Then, after a predetermined pressurization, the raw material 7 for continuously extruding the mixture 6 through the die 11 of the high-pressure extruder 9 into the atmosphere and processing it as a product.
Is extruded. In the fourth manufacturing process, the foaming material 7 is arranged for each manufacturing got having different required performance, and the cutting machine 12 is used.
, And cut out to finish a predetermined product 13.

The flexible foamed fiberboard 1 according to the present invention also has the following excellent properties in terms of characteristics. Weight reduction is achieved when the bulk specific gravity is in the range of 0.1 to 0.2 kg / l. When the thermal conductivity is in the range of 0.10 to 0.30 W / m · K, it has excellent heat retention performance. Since the air content inside the fiberboard has increased, the sound absorption characteristics have been improved. By controlling the expansion ratio of the resin foam, the addition ratio of the wood fiber and the resin foam, and the content of air, rigidity, toughness, and flexural strength suitable for the use of the product can be imparted to the fiberboard.

[0015]

The flexible foamed fiberboard according to the present invention is made by foaming a wood fiber and a polyolefin-based thermoplastic resin cullet as raw materials using a physical foaming agent. Is mixed with a resin foam, foamed by an extrusion foaming method using a physical foaming agent, and then cut out into a predetermined shape, so that the following effects can be exhibited. When used as a flooring in a house, the thermal efficiency of floor heating increases, saving on energy costs and saving energy. If used as the core material of the shroud used at the work site, it becomes a temporary material that is lightweight and has high sound absorption performance. Since wood-based industrial waste can be reused without incineration, C
Environmental problems such as O2 and cost can be improved. Since the curing film can be reused, industrial waste can be reduced in volume and cost. Since it can be recovered from renovation and demolition sites and regenerated as soft foamed fiberboard, it can be recycled several times.

[Brief description of the drawings]

FIG. 1 is a flexible foamed fiberboard according to the present invention.

FIG. 2 is a manufacturing process of a first stage of a flexible foamed fiberboard;

FIG. 3 is a manufacturing process at a later stage of a flexible foamed fiber board;

FIG. 4 is a conventional soft fiberboard.

[Explanation of symbols]

1 Flexible foam fiberboard 20
Wood fiber 2 Wood fiber 21
Adhesive 3 Polyolefin-based thermoplastic resin cullet 22
Fiberboard 4 Resin foam 5 Physical foaming agent 6 Mixture 7 Foam material 8 Melting pot 9 High pressure extruder 10 Air 11 High pressure extruder die 12 Cutting machine 13 Product

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Nachi, 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Inside (72) Takeshi Okazawa 1-2-3, Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hirokazu Sugiyama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E001 AA02 AB02 AC01 AD01 BA03 BA05 2E162 BA06 CD01 FC03 4F074 AA02L AA16L AA17L AA24L AA35L AE01 AE04 BA31 BA35 BA42 BA53 CA22 CC03X CC22X DA02 DA07 DA32 DA57 DA58

Claims (6)

[Claims] 1. A flexible foamed fiberboard which is made of wood fiber and cullet of a polyolefin-based thermoplastic resin as raw materials and foam-formed using a physical foaming agent. 2. The flexible foamed fiberboard according to claim 1, wherein the wood fiber is wood waste material. 3. The cullet of a polyolefin-based thermoplastic resin is a waste material of a cured film.
4. The flexible foamed fiberboard according to item 1. 4. A method for producing a flexible foamed fiberboard in which wood fibers crushed into rod-shaped chips are mixed with a resin foam, foamed by extrusion foaming, and then cut into a predetermined shape. 5. The method for producing a flexible foamed fiberboard according to claim 4, wherein the resin foam is formed by adding an evaporating foaming agent to a polyolefin-based thermoplastic resin cullet and foaming. 6. The method according to claim 5, wherein the evaporative foaming agent is a physical foaming agent.