JP4915806B2 - End cutting surface processing method of wood powder resin composite board - Google Patents

Description

  The present invention relates to a cutting process of an end portion along a width direction and a length direction of a wood powder resin composite board. More specifically, the present invention relates to a method for treating a cut surface that is exposed when an end portion of the wood powder resin composite board is cut.

  In recent years, the depletion of timber resources has made it difficult to obtain lumber timber, so various wood materials such as plywood, laminated timber, medium density fiberboard (MDF), particleboard, etc. are priced. In addition, it is easy to obtain and excellent in strength, so that the surface is made up as necessary and widely used in the fields of flooring, walling, ceilinging and the like.

  On the other hand, from the standpoint of reuse of wood waste materials, the wood material waste materials that are discharged when dismantling buildings built using the above wood materials, and wood waste materials that are discharged when furniture is dismantled, In recent years, wood powder resin composite boards made by crushing wood scraps, etc. discharged during building construction, and mixing, melting, and molding the pulverized powder with thermoplastic resin have been increasingly used from the viewpoint of resource reuse. It's getting on.

  Examples of the thermoplastic resin include polypropylene, hard or soft polyvinyl chloride resin, foamed vinyl chloride resin, polyethylene terephthalate resin, polystyrene resin, polyethylene resin, phenol resin, urethane resin, and ABS resin. In this case, the thermoplastic resin, like the wood waste, is often recycled and used as a resin product used for containers and packaging of foods including beverages, other resin products, and houses. Resin waste materials, etc., discharged when demolishing buildings are also crushed and reused.

  In order to prevent expansion and shrinkage accompanied by temperature changes, the above-mentioned waste materials of wood materials, sawdust, sawdust, sawdust, and wood-based material pulverized powder (hereinafter referred to as wood powder) and inorganic resin fillers such as calcium carbonate and talc, After being kneaded under heating in the presence of a reinforcing agent or the like, it is extruded into a plate shape by an extruder. The plate body thus formed by extrusion and having a fixed size is used as a wood powder resin composite board (WPB) for various uses such as building materials.

On the other hand, attempts have been made to give various woody furniture or daily necessities by giving the surface of the wood powder resin composite board a design close to the surface characteristics of natural wood. For example, in the following Patent Document 1, in the manufacturing method of a wood-like molded product formed by mixing and melting a wood powder obtained by pulverizing a cellulose material and a resin, the thickness of the molded product to be molded A method for producing a wood-like molded product is disclosed, in which sink marks are formed as a grain pattern on the surface of a thick part.
JP 2001-328150 A (pages 1 to 3, FIG. 1)

  When using the above wood powder resin composite board for building, renovation, furniture or daily necessities, especially when using it as a building material for construction, the edge in the width direction or length direction is cut with a tenoner etc. It is necessary to form a real joint. At this time, since the cutting surface was rough and rough and looked white, it was necessary to frequently change the blades to maintain the sharpness so as to obtain a wet color. In addition, when whitening occurs, it is necessary to polish the cut surface so as not to cause a color difference with the smooth non-cut surface.

  However, replacement of the blade takes time and there is a problem that polishing the cut surface to improve the merchantability increases the number of processes and decreases the productivity. The present invention solves such a problem, and when the end portion of the wood powder resin composite board is cut, the rough cutting surface generated by the tenoner or the like looks white, and the non-cutting surface is uncomfortable. An object of the present invention is to provide a method for treating an end cutting surface of a wood powder resin composite board that can prevent and make the cutting surface inconspicuous.

In order to solve the above problems, the present invention takes the following technical means. That is, according to the first aspect of the present invention, the cross section formed of the horizontal plane and the vertical plane exposed by cutting the end portion of the wood powder resin composite board obtained by mixing and melting the wood powder and the resin and molding it. A method of treating a cutting surface of an L-shaped jointing joint , wherein a hot pressing step of pressurizing the exposed cutting surface under heating by simultaneously bringing a heating roll or a heating blade into contact with the horizontal and vertical surfaces. An end cutting surface treatment method for a wood powder resin composite board is provided.

  As the above-mentioned wood powder, wood-based materials such as plywood, laminated wood, medium density fiberboard (MDF), particle board, and other wood materials, scraps discharged from the construction site of houses, sawdust, sawdust, etc. A thing etc. are used. As the resin, thermoplastic resins such as polypropylene, hard or soft polyvinyl chloride resin, foamed vinyl chloride resin, polyethylene terephthalate resin, polystyrene resin, polyethylene resin, phenol resin, urethane resin, ABS resin, etc. are used. It is preferable from the viewpoint of resource saving that the thermoplastic resin is also recycled from the resin waste.

  According to a second aspect of the present invention, in addition to the invention according to the first aspect, the heating temperature is set near the softening temperature of the resin constituting the wood powder resin composite board. . The softening temperature of the resin is not particularly limited, but is usually 110 to 200 ° C, preferably 130 to 160 ° C.

The method for treating an end cutting surface of a wood resin composite board according to claim 1 further comprises the step of heating the iron roll with a built-in electric heater and rolling the end cutting surface as a heating roll. Done.

Or it heats an iron blade with the electric heater with which the said hot pressing process was incorporated, and is performed by pressing an edge part cutting surface as a heating blade. At this time, the lower tip of the heating blade is rounded so that it can be processed without being caught on the cutting surface.

The end cutting surface treatment method of the wood resin composite board according to the invention of claim 1 is as described above, and the end portion of the wood powder resin composite board obtained by mixing and melting the wood powder and the resin. The rough surface exposed by heating is pressed and heated under heat to smooth the rough rough cutting surface of the wood resin composite board and make the difference from the surface inconspicuous. For this reason, it is possible to provide, without a sense of incongruity, for example, a joint coupling having a smooth horizontal plane and a vertical plane at the end of the wood resin composite board. Moreover, when the above-mentioned hot pressing is performed with a heating roll, the thermoplastic resin contained in the wood resin composite board is rolled in a softened state, and the rough cutting surface formed by mixing the thermoplastic resin and wood powder is It can be heat fused and homogenized to give a smooth, glossy surface. Further, when the hot pressing process is performed with a heating blade, the thermoplastic resin contained in the wood resin composite board is pressed in a softened state so that both lower ends of the heating blade are traced by the chamfered tip portions. A rough cutting surface composed of a mixture of a plastic resin and wood powder is heat-sealed and homogenized, so that a smooth, glossy surface can be obtained.

  The end cutting surface treatment method for the wood resin composite board according to claim 2 is as described above. In addition to the effect of the end cutting surface treatment method for the wood resin composite board according to claim 1, the heating temperature is set to be equal to the wood temperature. By setting the temperature near the softening temperature of the resin constituting the powder resin composite board, the thermoplastic resin contained in the wood resin composite board softens under the above temperature and is pressed in a softened state. A rough cutting surface formed by mixing with wood flour is heat-sealed and homogenized to obtain a smooth, glossy surface.

  Hereinafter, an embodiment of a method for treating an end cutting surface of a wood resin composite board according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a wood resin composite board A in which polypropylene is used as a thermoplastic resin, and the end portions along the length direction are cut by a portion indicated by a dotted line by a tenoner or the like and bonded together. The case where a part is provided is shown. FIG. 2 is a perspective view schematically showing an exposed cutting surface of the pegging joint 1 provided at the end of the wood resin composite board A by the above cutting. As shown in FIG. 2, the horizontal surface 11 and the vertical surface 12 of the splicing joint 1 are exposed by cutting the inside of the wood resin composite board A, and the rough rough cutting surface looks white, resulting in a color difference from the surface. Give a sense of incongruity.

  In the first embodiment of the present invention, the lap joint 1 is clamped by a heating roll 2 heated by an electric heater up to the softening temperature of polypropylene, that is, around 120 ° C. FIG. 3 is an explanatory diagram showing a process of transporting the wood resin composite board A with the feed roll R and pressing with the heating roll 2 at the above-described temperature. FIG. 4 is also a partial cross-sectional explanatory view showing a process of transporting the wood resin composite board A by the feed roll R and pressing with the heating roll 2 at the above-described temperature.

  As shown in FIGS. 3 and 4, a rod-shaped heater 21 is provided inside the heating roll 2, and the surface temperature of the heating roll 2 is maintained at about 120 ° C. The vertical surface 12 is rolled and clamped. Since the polypropylene contained in the wood resin composite board A softens under the above temperature and is pressed in the softened state, the rough cutting surface formed by mixing polypropylene and wood powder is heat-sealed and homogenized. Can be made into a smooth, glossy surface.

  As schematically shown in FIG. 3, after cutting, the rough cutting surface of the mating joint 1 that appears white is pressed by the heating roll 2 under heating, and the pressing horizontal surface 11a and the pressing vertical surface 12a. Becomes a wet color, and the color difference from the surface of the wood resin composite board A can be reduced. And it is possible to provide the jagged joint 1 at the end along the length direction of the wood resin composite board A without making it uncomfortable with the surface.

  FIG. 5 is an explanatory view showing the steps of the second embodiment of the method of treating the end cutting surface of the wood resin composite board. As shown in FIG. 5, the wood resin composite board A is conveyed by the feed roll R and is heated to the softening temperature of polypropylene, that is, near 120 ° C. by the heating blade 3 heated by the rod heater 31 provided therein. Heated and pressed. FIG. 6 is also a partial cross-sectional explanatory view showing a process in which the wood resin composite board A is conveyed by the feed roll R and pressed by the heating blade 3 heated to around 120 ° C. and pressed.

  As shown in FIG. 5, since the position of the heating blade 3 is fixed, when the wood resin composite board A is conveyed by the feed roll R, the heating blade 3 relatively slides. At this time, since both lower end portions of the tip end portion 32 are rounded and rounded, it can be smoothly slid and pressed.

  Then, as shown in FIG. 6, the tip 32 of the heating blade 3 is pressed so as to trace the horizontal surface 11 and the vertical surface 12 of the joint coupling portion 1, and as in the first embodiment, polypropylene and wood A rough cutting surface formed by mixing powder is homogenized and processed into a smooth, glossy pressing water flat surface 11a and a pressing vertical surface 12a. In this way, the endless joint portion 1 can be provided at the end portion along the length direction of the wood resin composite board A without any discomfort with the surface.

  In the first embodiment and the second embodiment described above, the mode in which the mating joint is provided at the end along the length direction of the wood powder resin composite board has been described. In fact, it is possible to apply the method of treating an end cutting surface of a wood powder resin composite board of the present invention to an embodiment in which a real joint portion made of a female fruit is provided. Moreover, it is also possible to apply the edge part cutting surface processing method of the wood powder resin composite board of this invention not only to the edge part along a length direction but to the edge part along a width direction. Thus, the present invention can be modified in various ways, and belongs to the technical scope of the present invention without departing from the scope of the claims.

It is a perspective view which shows a wood resin composite board. It is a perspective view which shows typically the cutting surface which the jagged edge coupling | bond part provided in the edge part of the wood resin composite board exposed by cutting. It is explanatory drawing which shows the process concerning 1st Embodiment of this invention. It is a fragmentary sectional view showing a process concerning a 1st embodiment of the present invention. It is explanatory drawing which shows the process concerning 2nd Embodiment of this invention. It is a fragmentary sectional view showing a process concerning a 2nd embodiment of the present invention.

Explanation of symbols

A wood resin composite board 1 pegging joint 11 horizontal surface 11a pressing water flat surface 12 vertical surface 12a pressing vertical surface 2 heating roll 21 rod heater 3 heating blade 31 rod heater 32 tip portion R feed roll

Claims (2)

Cutting the end of the wood powder resin composite board obtained by mixing and melting wood powder and resin, and processing the cutting surface of the cross-joint joint with an L-shaped cross section consisting of an exposed horizontal and vertical plane A cutting surface of a wood powder resin composite board, comprising a hot pressing step in which a heating roll or a heating blade is simultaneously brought into contact with the horizontal and vertical surfaces to pressurize the exposed cutting surface under heating. Processing method. The edge part cutting surface processing method of the wood powder resin composite board of Claim 1 which makes the said heating temperature into softening temperature vicinity of resin which comprises a wood powder resin composite board .

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