JPH08142150A - Long plastic molded article - Google Patents

Abstract

PURPOSE: To inexpensively provide a long plastic molded article such as a baseboard, a winding verandah running on more than two sides of a house or a molding good in processability such as sawing properties or nailing properties and excellent in capacity such as water resistance or dimensional stability and design effect. CONSTITUTION: In a long plastic molded article due to the two-color or multicolor extrusion molding of at least a core part 2 and an outside part 3, the core part 2 is formed by molding a resin containing a paper powder and the outside part 3 is formed by molding a resin containing no paper powder. The size of the paper powder added to the resin of the core part 2 is pref. set to a long diameter of 6mm or less and the film length of pulp contained therein is pref. set to 1mm or less and the paper powder content of the resin is pref. set to 10-40wt.%. The core part 2 may be formed by the foam molding of the resin containing the paper powder and decoration is applied to the surface of the outside part by direct printing, transfer printing or wrapping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to long members such as skirting boards, rims, moldings, doors, window frames and the like used for building members and the like. MD
F) and an improved technique for manufacturing by replacing a wood-based material such as plywood with a plastic-based material.

[0002]

2. Description of the Related Art Wood-based materials such as wood, medium density fiberboard (MDF), particle board, and plywood are used for long members such as skirting boards, rims, and moldings that have been conventionally used as building materials. Is mainly used. However, in recent years, depletion of forest resources has been regarded as a problem due to environmental problems, and the wood-based material itself also has, for example, insufficient water resistance in terms of performance, is easily warped, is prone to decay, or has mold. There are drawbacks such as easy to do. In order to solve such problems, it has been attempted to use various plastics or plastics blended with wood powder.

[0003]

However, in the case of ordinary plastics, there is a problem in workability such as difficulty in sawing or nailing at the construction site.
It has a large expansion coefficient and lacks dimensional stability, and when it is used for fittings such as doors, there are problems such as difficulty in opening and closing due to changes in temperature, and easy formation of gaps. There are drawbacks. In the case of a plastic blended with wood powder, the above-mentioned processability can be improved, but since the resin becomes blackish and has a muddy color, there is a problem in that the surface decoration in the post-processing is affected. The present invention has been made in view of the above background, and an object thereof is to be inexpensive, have good workability such as sawing and nailing, and have water resistance, and rot and mold. An object of the present invention is to provide a long plastic molded product such as a skirting board, a rim, a molding, etc., which is excellent in performance that can prevent the occurrence of the above and has good dimensional stability.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the following objects of the present invention have been achieved. That is, the invention of claim 1 is a long plastic molded product obtained by multicolor extrusion molding of at least two colors of a core part and an outer part, or more, and the core part is a resin containing paper powder. And the outer portion is formed of a resin that does not contain paper powder.

Further, according to the invention of claim 2, the resin of the core portion contains 10 to 40% by weight of paper powder, and the size of the paper powder is 6 mm or less in major axis, and the fiber length of the pulp contained therein. Is 1
The long plastic molded article according to claim 1, which has a diameter of not more than mm.

The invention according to claim 3 is the long plastic molded product according to claim 1 or 2, wherein the core portion has a foam structure. And this claim 4
The present invention comprises the long plastic molded product according to any one of claims 1 to 3, wherein the surface of the long plastic molded product is decorated.

[Preferred Embodiment] (Regarding Paper Powder) The paper powder contained in the resin in the present invention may be crushed blank shavings generated by cutting or the like, but milling such as bookbinding (using a rotary blade) Surfacing)
In this case, a large amount of paper dust generated can be used. The paper powder itself has an indefinite shape, but it is preferable that the major diameter is 6 mm or less and the fiber length of the contained pulp is 1 mm or less. When the major diameter of the paper powder is 6 mm or more and the fiber length is 1 mm or more, the kneadability with the resin is deteriorated, the kneading takes time, and the paper powder is less likely to be further fragmented, which is not preferable because it becomes uneven. . When the major diameter of the paper powder is 6 mm or less and the fiber length is 1 mm or less, the kneading with the resin is possible, and the smaller the kneading is, the easier the kneading is. The use of such paper powder is preferable from the viewpoints of effective utilization of waste and effective utilization of pulp resources, and it is cheap and raw materials are easily available.

(Regarding Resin) As the resin used in the long plastic molding of the present invention, polystyrene, acrylonitrile-styrene copolymer resin (AS resin), acrylonitrile-butadiene-styrene copolymer resin (AB
S resin) such as styrene resin, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinylidene chloride copolymer resin, etc., and polypropylene resin, polyethylene resin, polymethylpentene Polyolefin resins such as resins are mainly used, but not limited thereto. For example, polyamide, polyester, polycarbonate, polyacrylate, polyacetal, polyphenylene ether (P
Resins such as PE) and polyphenylene sulfide (PPS) can be used, and furthermore, polyvinyl chloride-based, polyurethane-based, polyolefin-based, polystyrene-based, polyester-based and other elastomers can also be used. These resins may be used alone, or may be used by appropriately blending two or more kinds.

(Kneading resin and paper powder) By kneading the above resin and paper powder, pellets used for extrusion molding are prepared. As a kneading and pelletizing device, it is efficient to use a device in which a pelletizer is incorporated in an intensive mixer (Banbury mixer) having a strong shearing force. By heating the resin in this apparatus and kneading the paper powder in the softened state, the paper powder is further crushed and uniformly dispersed. The resin mixed with paper powder is cooled and pelletized through a pelletizer.

When kneading, the amount of the paper powder added to the resin is in the range of 10 to 40% by weight, and the workability of sawing, nailing, etc. of the molded product is improved, and the dimensional stability is improved by lowering the expansion coefficient. Furthermore, it is preferable in that the cost reduction effect and the like can be comprehensively obtained. When the addition amount is 10% by weight or less, all the above effects are insufficient, and when the addition amount is 40% by weight or more, the workability, the dimensional stability and the cost reduction effect can be obtained, but the extrusion It is not preferable because the smoothness of the surface of the molded product is remarkably reduced by molding.

(Regarding molding) The long plastic molded product of the present invention is produced by multicolor extrusion molding of at least two colors of a core part and an outer part, and the core part contains paper powder. Resin which does not contain paper powder is used for the outer portion. The term "multicolor" used in the present invention does not necessarily mean the color (hue, brightness, saturation) of each layer.
However, it is not limited to a plurality of layers, and is used to mean a plurality of layers having different materials, compositions, or properties. When extrusion molding is performed using only the resin containing paper powder, the smoothness of the surface of the molded product is gradually deteriorated as the content of paper powder increases, and the appearance becomes unfavorable. Therefore, in order to maintain the smoothness of the surface, a multi-color extrusion molding method of two colors or more is adopted, a resin containing no paper powder is used for the outer part, and paper powder is used for the core part of one or more layers. A resin containing is used. The outer resin does not contain paper dust, but a colorant and other additives can be added as appropriate. Also in the multicolored form, in order to prevent warpage, it is preferable to cover the entire circumference of the core with an outer circumference, but a part of the circumference of the core (for example, 3/4 circumference) is covered with an outer member. It can also be coated. If there is a surface that is not exposed to the outside, such as a window frame, it is advisable to bring the exposed surface of the core portion to the non-exposed surface.

As described above, the resin layer containing no paper dust on the outer side is a layer for improving the appearance and surface properties of the molded product, and the thickness thereof may be thin as long as it does not hinder the molding.
It is sufficient if it is about 2 to 3 mm. Further, according to the multicolor extrusion molding, only the core portion can be foam-molded, and the appearance,
In addition to weight reduction, it is possible to impart soundproofness, heat insulation, cushioning, etc. without changing the surface property. In this case, a foaming agent may be added to the resin of the core and molded, and a known inorganic or organic foaming agent as shown below can be used as the foaming agent.

As the inorganic foaming agent, sodium bicarbonate, ammonium carbonate, sodium boron hydride,
Examples of the organic foaming agent include azo compounds such as azodicarbonamide, azobisisobutylnitrile, and diazobenzene; sulfonyl hydrazides such as paratoluenesulfonyl hydrazide and 4,4-oxybisbenzenesulfonyl hydrazide. Compounds, and dinitrosopentamethylenetetramine,
Examples thereof include nitroso compounds such as N, N-dimethyl-N, N-dinitrosoterephthalamide. The amount of these foaming agents added varies somewhat depending on the type of foaming agent, foaming conditions, etc., but the foaming ratio is about 1.2 to 4 times, and 0.2 to 2.
It is in the range of 0% by weight, and is usually about 0.7% by weight. When the expansion ratio is 4 times or more, the strength itself of the molded product is remarkably deteriorated, and the nailability is also deteriorated, which is not preferable.

Further, in the multicolor extrusion molding, it is preferable that the resin used for the outer portion and the resin used for the core are the same type of resin in terms of adhesiveness between the two, but different types of resins may also be used. it can. That is, even if the cost is a little high for the outer part, a higher performance resin is used, and by using a general-purpose resin containing paper powder such as polystyrene, polypropylene, polyvinyl chloride, etc., for the core part, it is inexpensive and high performance molding. You can get things. For example, polyvinyl chloride and ABS,
When one of the combinations of polystyrene and ABS, polyvinyl chloride and acrylic resin, etc. is the core part and the other is the outer part, the adhesiveness between the two is good. When the adhesiveness between the two is weak, another resin that enhances the adhesiveness can be used for the intermediate layer. Further, in the case of a multi-color body having three or more layers, the paper dust content rate may be gradually reduced layer by layer from the core portion to the outer portion, and the paper dust content rate may be set to 0 at the outermost portion. it can.

(Regarding Surface Decoration of Molded Product) The surface decoration method of a long plastic molded product is a method of directly printing by conventionally known silk screen printing, gravure offset printing, tampo printing, transfer printing, or the like. Japanese Patent Publication No. 61-5895, Japanese Patent Publication No. 1-3333.
Any method such as a film laminating method called so-called lapping disclosed in Japanese Patent Publication No. 2 and Japanese Patent Publication No. 3-2666 may be used, and embossing may be performed.

[0016] In particular, the lapping process is to laminate a roll-shaped film, which has been decorated by printing in advance, on the surface of the molded product, and the method of adhering to the surface of the molded product is, for example, previously printed on the printed pattern of the roll-shaped film. A heat-sensitive adhesive may be applied, and this surface may be thermocompression-bonded to the surface of the molded product with a heating roll or the like. It may be thermocompression bonded to the surface of the molded product. When a long plastic molded product formed by extrusion molding as in the present invention is subjected to lapping, it may be post-processed on individual molded products, but the method of simultaneous in-line painting with extrusion molding is effective.

[0017]

The long plastic molding of the present invention is formed by multicolor extrusion molding of at least two core parts and an outer part, or more, and the core part is formed of a resin containing paper powder. The outer portion is made of a resin containing no paper powder. By thus containing paper powder in the resin of the core, the resin does not stick to the saw blade due to frictional heat when the molded product is sawed, and the resin can be cut smoothly. Further, even if a nail is struck, the distortion of the molded product is absorbed so that the molded product is not cracked and the workability is improved. The dimensional stability is improved because the thermal expansion coefficient of the molded product is reduced. Furthermore, since the outer side of the molded product is made of a resin that does not contain paper powder, the surface is smooth and the appearance is good,
Water resistance and other inherent properties of the resin used are utilized. By such multicolor extrusion molding, the defects of both resins can be compensated and the advantages can be effectively utilized.

[0018]

The present invention will be described in detail below with reference to the drawings and examples. FIG. 1 and FIG. 2 are schematic cross-sectional views showing the configuration of one embodiment of the long plastic molded product (baseboard shape) of the present invention. However, the present invention is not limited to these. (Example 1) With respect to 100 parts by weight of polystyrene (hereinafter PS) resin (styrene EF60 manufactured by Idemitsu Petrochemical),
Paper powder having a major axis of 6 mm or less and a fiber length of pulp of 1 mm or less was mixed at a ratio of 11.2 parts by weight, and heated and kneaded with a Banbury mixer to prepare PS pellets containing 10% by weight of the paper powder. Next, using a multicolor extruder, FIG.
A cross-sectional shape of 120 × 10 mm with an outer thickness of 2 mm and a length of 3 m of a skirting board-shaped long plastic molded product 1 by two-color extrusion molding of a core part 2 and an outer part 3 as shown in FIG. The paper powder-containing PS resin is used for the core portion 2, and the paper resin does not contain paper powder for the outer portion 3 (styrene EF6).
0), followed by wood grain printing on the surface, and a vinyl chloride-vinyl acetate copolymer resin-based heat-sensitive adhesive applied on the polyvinyl chloride (hereinafter referred to as PVC) having a thickness of 30 μm. The film (4 in FIG. 2) was lapped by thermocompression bonding to obtain a wood pattern-patterned baseboard molding of Example 1.

(Example 2) In the constitution of Example 1, 53.% of the paper powder was added to 100 parts by weight of the PS resin so that the paper powder content of the PS resin used in the core was 35% by weight.
Except for mixing 9 parts by weight to prepare pellets, the same process as in Example 1 was carried out to prepare a wood pattern-patterned baseboard molding in Example 2.

(Example 3) In the configuration of Example 1, the PS resin used for molding the core portion and the outer portion was changed to polypropylene (hereinafter PP) resin (Polypro E100G manufactured by Idemitsu Petrochemical), and the core portion was further changed. PP resin pellets were prepared by mixing 100 parts by weight of the PP resin with 25 parts by weight of the paper powder so that the PP resin used had a paper powder content of 20% by weight. Further, the same procedure as in Example 1 was carried out except that the adhesive of the PVC film with wood grain print used for decorating the baseboard molding was changed to a urethane adhesive and wrapping was carried out in the dry laminating method. A baseboard molding with a wood grain pattern was prepared.

(Fourth Embodiment) In the configuration of the first embodiment, 2
At the time of color extrusion molding, P containing 10% by weight of paper powder in the core
0.75% azodicarbonamide was used as the foaming agent only in S resin, and the amount of foaming agent added and the molding conditions were adjusted so that the expansion ratio of the core was doubled. The same process as in Example 1 was carried out to prepare a baseboard molding with a wood pattern in Example 4.

(Fifth Embodiment) In the configuration of the second embodiment, 2
At the time of color extrusion molding, P containing 35% by weight of paper powder in the core
0.75% azodicarbonamide was used as the foaming agent only in S resin, and the amount of foaming agent added and the molding conditions were adjusted so that the expansion ratio of the core was doubled. The same process as in Example 2 was carried out to prepare a baseboard molding with a wood pattern in Example 5.

(Sixth Embodiment) In the configuration of the third embodiment, 2
At the time of color extrusion molding, P containing 20% by weight of paper powder in the core
0.75% azodicarbonamide was used as the foaming agent only in P resin, and the amount of foaming agent added and the molding conditions were adjusted so that the expansion ratio of the core was doubled. The same process as in Example 3 was carried out to prepare a baseboard molding with a wood pattern in Example 6.

(Comparative Example 1) PS resin (styrene EF6)
(Ex. Idemitsu Petrochemical Co., Ltd.) was extruded to form a baseboard molding having the same dimensions as in Example 1, and the surface thereof was wrapped with a PVC film with a wood grain print in the same manner as in Example 1 to prepare a baseboard. A baseboard molding with a grain pattern was prepared.

Comparative Example 2 PP resin (polypro E100
G) manufactured by Idemitsu Petrochemical Co., Ltd.) was extruded to form a baseboard molding having the same dimensions as in Example 1, and the surface of the baseboard was lapped with a PVC film with wood grain print in the same manner as in Example 3 to obtain a product of Comparative Example A baseboard molding with a grain pattern was prepared.

(Evaluation and Results) The following items were measured or evaluated with respect to the baseboard moldings having the wood grain pattern formed in Examples 1 to 6 and Comparative Examples 1 and 2, and the results are shown in Table 1. Indicated. (1) Measurement of linear thermal expansion coefficient The linear thermal expansion coefficient at 20 ° C. was measured for each long molded product. (2) Workability Each long molded product was sawed and nailed to evaluate its suitability. ○: When sawing, the resin does not stick to the blade and cuts smoothly,
Also, those that do not crack or have poor holding properties when nailed. ×: When sawing, the resin sticks to the blade and becomes difficult to cut,
Alternatively, those that have cracks or have poor retention due to nailing. (3) Water resistance Each long molded product was immersed in water at room temperature for 3 hours, and evaluated by the presence or absence of deformation, swelling, and weight increase. ◯: Almost no deformation, swelling, or weight increase. X: Deformation, swelling, or weight increase is recognized. (Below margin)

[0027]

[Table 1] (Note) In Table 1,% means% by weight.

As is clear from the evaluation results shown in Table 1, the workability of sawing, nailing, etc. is improved by incorporating paper powder into the resin of the core of a long plastic molding produced by multicolor extrusion molding. At the same time, the linear thermal expansion coefficient was reduced, and the dimensional stability could be improved. Specifically, the linear thermal expansion coefficient was about 1/3 for the PP resin and about 1/2 for the PS resin. The water resistance was also good without any particular problems. For reference, M is a wood-based material.
The linear thermal expansion coefficients of DF (medium density fiberboard), particle board and plywood are shown below. MDF 5.67 × 10 ^-6 , particle board 7.00 × 10 ^-6 , plywood 0.77 × 10 ^-6
Although all of them are smaller than the plastic materials, they are not water-resistant and therefore expand significantly due to moisture absorption, and in this respect, they lack dimensional stability.

[0029]

As described in detail above, the long plastic molded product of the present invention is a long plastic molded product obtained by multi-color extrusion molding of at least two colors of the core part and the outer part or more. The core portion is made of a resin containing paper powder, and the outer portion is made of a resin not containing paper powder. Adopting such a configuration has the following effects. Cutting of the molded product by sawing becomes easier, and nailing is possible, improving workability. The coefficient of linear thermal expansion is reduced, and dimensional stability is improved. It has excellent water resistance, does not suffer from decay and mold unlike wood-based materials, and does not warp, swell, or swell due to moisture absorption. Since the resin on the outside does not contain paper powder, the physical properties of the resin can be utilized as it is and at the same time the surface properties of the molded product are good,
Smooth and excellent in appearance. Paper powder, which is a waste, can be effectively used, and the weight and cost of molded products can be reduced.

Then, the paper powder content of the resin of the core is set to 1
0 to 40% by weight, and the size of paper powder is 6 mm in major axis
By using pulp with a fiber length of 1 mm or less, it is easy to knead with the resin, and the surface properties, processability, dimensional stability, and other properties of the molded product, and cost reduction, etc. A long plastic molded product excellent in terms of quality is obtained. Further, by foam-molding the core portion to form a foam structure, it is possible to further reduce the weight and reduce the cost, and to impart the heat insulating property, the soundproof property, and the shock absorbing property. Further, by decorating the surface of the molded product, it is possible to obtain a long plastic molded product having a high appearance in terms of appearance.

As described above, the present invention is a long plastic molding which is inexpensive, has good workability, is excellent in water resistance, dimensional stability, heat insulating property, soundproofing property, cushioning property, etc. and has a high appearance in design. It has the effect of providing goods and is very useful in industry.

[Brief description of drawings]

FIG. 1 A long plastic molding of the present invention (skirting board shape)
It is a schematic cross section which shows the structure of one Example.

[FIG. 2] Long plastic molding of the present invention (skirting board shape)
FIG. 7 is a schematic cross-sectional view showing the configuration of another example of FIG.

[Explanation of symbols]

 1 Long plastic molded product 2 Core part 3 Outside part 4 Decorative film layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 9:00 31:10

Claims (4)

[Claims] 1. A long plastic molded product obtained by multi-color extrusion molding of at least two colors of a core part and an outer part, or more, wherein the core part is formed of a resin containing paper powder, A long plastic molded product, wherein the outer portion is formed of a resin containing no paper powder. 2. The resin of the core portion contains 10 to 40% by weight of paper powder, and the size of the paper powder is 6 mm or less in major axis,
The long plastic molded article according to claim 1, wherein the fiber length of the pulp contained is 1 mm or less. 3. The long plastic molded product according to claim 1, wherein the core portion has a foam structure. 4. The long plastic molded product according to any one of claims 1 to 3, wherein the surface of the long plastic molded product is decorated.