Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – With liberating or forming of particles
Patent
1994-10-20
1997-04-15
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
With liberating or forming of particles
264109, 264122, 428407, B29B 900, B29C 4700, B29C 4500
Patent
active
056206429
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a simulated wood product manufacturing method and a simulated wood product, and more particularly to a method of manufacturing a product having a wood-like feeling, in particular, a simulated wood product close to one made of natural wood including an outer appearance, by using as raw materials pulverized dust of a cellulose material, and to such a simulated wood product.
BACKGROUND ART
Recently, it has been attempted to finish the surfaces of various furnitures or commodities with a feeling of natural wood by imparting, to synthetic resin moldings, surface characteristics and color tones close to those of natural wood.
Such a simulated wood resin product close to one made of natural wood has been manufactured as follows. For coloring the product in a color tone similar to that of natural wood to present aspects of that wood, a predetermined amount of wood dust and a pigment corresponding to the desired color tone have been added to a molding resin material when a synthetic resin molding is molded, so that the resin molding has a color tone and a look close to those of the natural wood of interest.
Alternatively, for giving only the surface of a product aspects like natural wood, a predetermined amount of wood dust has been added to a paint when a surface coating or film is formed, for example, so that the surface of a resin molding has a color tone and a took close to those of the natural wood of interest.
Wood dust added to a molding resin material is often improved so as not to generate wood vinegar gas in a molding machine during the resin molding for the purpose of increasing dispersity of wood dust in a mixture with resin. Known typical wood dust is surface ground dust of particle boards whose surfaces are hardened by a treatment using phenol or urea resin.
The primary features of surface ground dust of particle boards are that the dust is fine, has less cilia on the surface, and has a granular shape providing a high smoothness. Thus, because of being fine and having a high smoothness, surface ground dust is regarded as wood dust which is satisfactorily dispersed and mixed in powdery resin materials.
On the other hand, wood dust obtained by directly pulverizing wood into fine dust has had a disadvantage that the pulverizing efficiency is low regardless of whether the wood dust is pulverized by a dry or wet pulverizer, and a great amount of large-sized wood dust remain in the pulverized dust even after the pulverizing process for a long time. Also, this type of wood dust is not granular in shape, and most of the dust has fibers projecting like whiskers such that even if the dust size measured along the minor axis is several microns, the dust is long along the major axis in the form of cilia. When mixed in a resin material before use, therefore, wood dust is often mutually tangled to produce an agglomerated state and hence is not uniformly dispersed in the resin material. Still another disadvantage is that since pulverized wood dust is largely varied in size, molded resin products are more likely to cause molding distortions or other defects, and the mechanical strength is different from part to part.
For the above disadvantages, wood dust obtained by directly pulverizing wood into fine dust is thought as having limitations in terms of mixing, color and quality control when used as wood dust to be added in a molding resin material.
At the present, however, resin moldings produced by the conventional methods cannot have uniform wood-like aspects in themselves even when surface ground dust of particle boards is used as wood dust to be added. This is because the surface ground dust does not exhibit uniform woody characteristics due to differences in material characteristics of the particle boards and, in addition, the dust is liable to vary in size depending on grinding means, e.g., due to differences in mesh of sand paper used. Accordingly, wood dust obtained by directly pulverizing wood into fine dust and drying the same must be employed in practical
REFERENCES:
patent: Re32329 (1987-01-01), Paszner
patent: 4505869 (1985-03-01), Nishibori
Kamite Masayuki
Katoh Masami
Kubovcik Ronald J.
Lydon James C.
Misawa Homes Co. Ltd.
Theisen Mary Lynn
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