JP2005224962A - False bamboo made of synthetic resin, method for forming surface pattern thereto and extrusion molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a false bamboo made of a synthetic resin ensured in the touch of a natural bamboo by forming a surface pattern changed in hue in an outer peripheral direction and preventing the hue from becoming monotonous. <P>SOLUTION: A false bamboo main body 10 comprising a thermoplastic resin is formed by extrusion molding and two inner and outer color layers 11 and 12 different in color comprising a thermosetting resin due to an inside layer 11 of a brown color type or the like and an outside layer 12 of a reddish black color type are laminated and formed on the surface of the false bamboo body 10. The wall thickness of the outside layer 12 is charged in the outer peripheral direction and longitudinal direction of the false bamboo body 10 and the thick-walled part of the outside layer 12 is set to a reddish black color type independent hue part. A thin-walled part is set to a composite hue part due to the brown color of the inside layer and the reddish black color of the outside layer 12 and, by the change of these hues, a spotted pattern 13 is developed on the false bamboo body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a synthetic resin pseudo-bamboo, and more particularly to a synthetic resin pseudo-bamboo that displays a pattern by changing the color tone on the surface, a surface pattern forming method thereof, and an extrusion molding apparatus.

  As this kind of artificial bamboo, it is known that a colored surface layer is formed on the surface side of the artificial bamboo body, and the surface is colored by, for example, green bamboo, dead bamboo, etc. The layer formation is performed by extrusion molding on the surface of the pseudo bamboo body immediately after extrusion molding.

JP-A-11-291326

  In this case, synthetic resin pseudo-bamboo can have a color tone similar to that of natural bamboo to some extent by adjusting the color tone of the colored surface layer. The bamboo and the like do not have the same color tone in the outer peripheral direction, and generally have a mottled pattern in which the color tone is changed, for example, by multiple colors or even by the shade of the same color. However, in the synthetic resin pseudo-bamboo, it is not possible to express the change in color due to multiple colors or shades of color. There is a strong tendency to be monotonous. Therefore, pseudo bamboo tends to give a kind of uncomfortable feeling that it is imitated with resin depending on the color tone of its surface layer.

  The present invention has been made in view of such circumstances, and the problem to be solved is that first, a pattern of color change is formed on the surface so that the texture is as similar to natural bamboo as possible. In order to provide a synthetic resin pseudo-bamboo that can eliminate the sense of discomfort with natural bamboo as much as possible, and secondly, the surface pattern can be simplified and reliably formed. The third object is to provide a synthetic resin pseudo-bamboo extrusion pattern forming apparatus, and thirdly to provide a synthetic resin pseudo-bamboo extrusion molding apparatus that can be suitably used to expose and form the surface pattern.

  In accordance with the first problem, the present invention forms two different colored inner and outer colored layers on the pseudo-bamboo body, and changes the thickness of the outer layer in the outer peripheral direction of the pseudo-bamboo body. By adjusting and changing the strength of coloring due to the thickness of the thin film, the outer layer coloring is applied to the surface by a strong coloring degree in the thickened part, and the surface is colored by the weak coloring degree in the thinned part. A composite color tone part that combines the outer layer coloration and the inner layer coloration is formed, and the color change arranged on the surface of the pseudo-bamboo body in the outer peripheral direction has a texture similar to that of natural bamboo, giving a sense of incongruity with natural bamboo. The surface pattern that has been eliminated is expressed and formed, that is, the invention according to claim 1 is formed of two layers of different colors inside and outside on the surface side of the pseudo bamboo body. Change the thickness of the outer layer toward the outer circumference of the pseudo bamboo body A synthetic resin pseudo-bamboo, characterized in that an outer color change pattern is displayed on the surface by a single color portion of the outer layer by the thick portion and a composite color portion of the inner and outer colored layers by the thin portion. It is a thing.

  In addition to the above, the invention described in claim 2 is the same pattern in the longitudinal direction by forming the surface pattern of the color change arranged in the outer circumferential direction also in the longitudinal direction of the pseudo bamboo body and arranging it in the outer circumferential direction. By cutting off the continuity of the color change pattern that will make the color change, the color change pattern of the single color tone part and the composite color tone part in the longitudinal direction will be made as a mottled pattern with the natural texture of natural bamboo as much as possible Thus, by changing the thickness of the outer layer also in the longitudinal direction of the pseudo bamboo body, the color change pattern in the outer peripheral direction becomes a discontinuous color change pattern in the longitudinal direction. 1. A synthetic resin pseudo-bamboo as described in 1.

  According to a third aspect of the present invention, in accordance with the second problem, a single color tone portion and a composite color tone portion are formed by changing the thickness of the inner and outer colored layers and the outer layer to change the color tone in the outer peripheral direction of the pseudo bamboo body. In order to adopt a pattern forming method for exposing and forming a pattern, the inner and outer colored layers having different inner and outer colored layers are formed on the surface side of the pseudo-bamboo body immediately after the extrusion by extrusion molding. The outer layer is formed by changing the thickness of the outer layer in the direction of the outer periphery of the pseudo-bamboo body, and the outer periphery of the outer layer is composed of a single color portion of the outer layer and the composite portion of the inner and outer colored layers of the thin portion. This is a synthetic resin pseudo-bamboo surface pattern forming method characterized in that a direction color tone change pattern is exposed on the surface.

  In addition to the above, the invention described in claim 4 is the same pattern in the longitudinal direction by forming the surface pattern of the color change arranged in the outer circumferential direction in the longitudinal direction of the pseudo bamboo body and arranging it in the outer circumferential direction. By discontinuing the continuity of the color change pattern that will make the color change, the color change pattern of the single color part and the composite color part is also arranged in the longitudinal direction to form the natural bamboo mottled pattern as much as possible In order to obtain a pattern forming method, the outer layer color change pattern is changed into the longitudinal direction of the pseudo bamboo body by changing the outer layer extrusion to the discontinuous color tone change pattern in the longitudinal direction. The surface pattern forming method of synthetic resin pseudo-bamboo according to claim 3, wherein the surface pattern is formed on the surface.

  According to a fifth aspect of the present invention, in accordance with the third problem, a pseudo bamboo having a surface pattern with a color change that forms a mottled pattern arranged in an outer circumferential direction and a longitudinal direction of the pseudo bamboo main body is extruded. In order to obtain an extrusion molding apparatus suitable for the above, this is an extrusion molding apparatus in which different inner and outer layers are laminated by extrusion molding on the surface side of the pseudo bamboo main body immediately after extrusion molding. For extrusion molding of a pseudo-bamboo body outer peripheral direction with a predetermined thickness in a mold for extrusion molding of the main body and an inner layer arranged in series in the extrusion direction adjacent to the mold and arranged behind the mold on the side of the extrusion direction And a pair of series inner and outer layer extrusion molds for the outer layer arranged in front of the extrusion direction and for pseudo-bamboo body outer wall thickness change extrusion, and a resin for the outer layer extrusion molds of the series pair Pseudo bamboo body length that controls increase and decrease of discharge amount It is obtained by the extrusion molding apparatus of the synthetic resin 擬竹 characterized by comprising a control means for the direction thickness changing.

  The present invention uses each of these as the gist of the invention as means for solving the above problems.

  Since the present invention is configured as described above, the invention described in claim 1 is formed by forming two differently colored inner and outer colored layers on the pseudo-bamboo body and setting the thickness of the outer layer in the outer circumferential direction of the pseudo-bamboo body. The thickness of the outer layer is adjusted to change the strength of the outer layer, and the thickness of the outer layer is adjusted to change the thickness of the outer layer. In the surface, the outer layer and inner layer are combined to form a composite color tone portion with a weak coloring degree, and the pseudo bamboo body surface has a texture similar to that of natural bamboo by changing the color tone in the outer circumferential direction. Therefore, it is possible to provide a synthetic resin pseudo-bamboo that can eliminate as much as possible a sense of incongruity with natural bamboo.

  In addition to the above, the invention described in claim 2 is the same pattern in the longitudinal direction by forming the surface pattern of the color change arranged in the outer circumferential direction also in the longitudinal direction of the pseudo bamboo body and arranging it in the outer circumferential direction. By cutting the continuity of the color change pattern that will make the color change, it is made of a synthetic resin that makes the natural color of mottled patterns of natural bamboo as much as possible to the color change pattern of the single color part and the composite color part in the longitudinal direction as well It can be a fake bamboo.

  The invention described in claim 3 is made of a synthetic resin which forms a single color tone portion and a composite color tone portion due to a change in thickness of the inner and outer colored layers and the outer layer, and expresses a color change pattern in the outer peripheral direction of the pseudo bamboo body. A method for forming a pseudo bamboo pattern can be provided.

  In addition to the above, the invention described in claim 4 is the same pattern in the longitudinal direction by forming the surface pattern of the color change arranged in the outer circumferential direction in the longitudinal direction of the pseudo bamboo body and arranging it in the outer circumferential direction. Synthetic resin that forms a natural textured mottled pattern of natural bamboo as much as possible in the longitudinal direction by cutting the continuity of the color change pattern that will make the color change of the single color part and the composite color part in the longitudinal direction as well It can be set as the pattern formation method of the artificial bamboo manufactured.

  According to a fifth aspect of the present invention, there is provided a synthetic resin pseudo-bamboo suitable for extruding a pseudo-bamboo that is arranged in the outer circumferential direction and the longitudinal direction of the pseudo-bamboo body and has a surface pattern with a color change that forms the mottled pattern. An extrusion apparatus can be provided.

  Hereinafter, the present invention will be described in more detail with reference to the example of the drawings. A is a synthetic resin pseudo bamboo, and the pseudo bamboo A is formed by laminating two layers of different colors on the surface side of the pseudo bamboo main body 10. By changing the thickness of the outer layer 12 of the inner and outer colored layers 11 and 12 in the outer peripheral direction of the pseudo bamboo main body 10, the single color portion 14 of the outer layer 12 by the thick portion and the inner and outer colored layers 11 and 12 by the thin portion are combined. The color change pattern 13 in the outer peripheral direction due to the color tone portion 15 is expressed on the surface. At this time, the pseudo bamboo A of this example also changes the thickness of the outer layer in the longitudinal direction of the pseudo bamboo main body 10. Thus, the color tone changing pattern 13 in the outer peripheral direction is a discontinuous color tone changing pattern in the longitudinal direction.

  In this example, the artificial bamboo A is formed into a cylindrical pipe shape having a diameter of about 2 to 2.5 cm and a thickness of about 2 mm, and swells on the surface at a predetermined pitch in the longitudinal direction, for example, a pitch of about 25 cm. A protruding bamboo rib 16 is provided so as to protrude, and the shape thereof is, for example, a round bamboo shape imitating true bamboo. A relatively inexpensive thermoplastic resin such as ABS is used for the pseudo bamboo body 10. In addition, the inner and outer colored layers 11 and 12 are made of, for example, the same thermoplastic resin which is relatively excellent in weather resistance such as acrylic, and the inner layer 11 of the inner and outer colored layers 11 and 12 is For example, the thickness of the pseudo bamboo body 10 is set to a predetermined thickness in the outer circumferential direction and the longitudinal direction, for example, approximately equal to the outer circumferential direction so as to have a required thickness of about several hundreds μm. In use It is assumed that the weather resistance of the bamboo body 10 is mainly ensured and the inner layer 11 is colored to contribute to the expression of the composite tone portion 15 in the surface pattern 13, while the outer layer 12 is the outer periphery of the pseudo bamboo body 10. The thickness is changed to a different thickness in such a way that the thickness in the direction and the longitudinal direction is, for example, about several hundred μm in the thick part and about 100 μm in the thin part. The overall color tone of the pseudo bamboo A is determined in FIG. 5 and the composite color tone portion 15 is formed in the thin portion to expose the surface pattern 13.

  That is, the artificial bamboo A of this example is such that, for example, true bamboo has a dark color tone such as a red-black color as a whole when used for a long time, and partially exhibits a light color tone such as the red-black color and the light color. In this example, the surface pattern 13 of the pseudo bamboo A changes its color tone in the outer peripheral direction of the pseudo bamboo body 10 and in the longitudinal direction in the present example. Therefore, the inner layer 11 in the inner and outer colored layers 11 and 12 of this example is changed to a color tone for a base to which a pigment such as brown, brown or ocher is added. On the other hand, the outer layer 12 has a finishing color tone to which pigments such as red black, brown black, and black are added, and the thickness of the outer layer 12 varies depending on the thickness of the outer layer 12. Especially the inner layer produced by the lightening The color tone of these composite of transmission for the outer layer 12 of the first color is as the formation of the surface pattern 13. At this time, the inner layer 11 of this example has a background color of a bamboo-bamboo tone as the brown color, etc., and when this is combined with a red-black color of the finish color tone, the color change preferable for the bamboo color is to be exhibited. By selecting the color tone of the inner and outer colored layers 11 and 12 while paying attention to the background and finishing for forming the pseudo bamboo A in this way, not only bamboo but also green bamboo, dead bamboo, etc. In addition, it is possible to achieve a color tone that sufficiently secures the natural texture.

  In this way, the pseudo bamboo A which has the surface pattern 13 which changes the color tone in the outer peripheral direction of the pseudo bamboo main body 10, in this example, in the longitudinal direction, is further formed after the pseudo bamboo main body 10 is extruded. If the inner and outer colored layers 11 and 12 are extruded and the thickness thereof, particularly the thickness of the outer layer 12, is changed in the outer circumferential direction, in this example, the outer circumferential direction and the longitudinal direction, In this example, it is possible to relatively easily form the surface pattern 13 having a different color tone and changed in the longitudinal direction.

  That is, if this is explained by the method for forming the surface pattern 13 of the pseudo bamboo A and its extrusion molding apparatus, the pattern forming method can be applied to the surface side of the pseudo bamboo main body 10 immediately after the extrusion molding by different internal and external colors. The inner and outer colored layers 11 and 12 are laminated in two layers, and the outer layer 12 of the inner and outer colored layers 11 and 12 is extruded by changing the thickness of the outer layer 12 in the outer peripheral direction of the pseudo bamboo body 10. The color change pattern 13 in the outer peripheral direction by the single color portion 14 of the outer layer due to the thick portion and the composite color portion 15 of the inner and outer colored layers 11 and 12 due to the thin portion is expressed on the surface. In this case, the outer layer 12 is extrusion-molded in the longitudinal direction of the pseudo bamboo body 10 so that the color change pattern 13 in the outer peripheral direction is formed on the surface as a discontinuous color change pattern in the longitudinal direction. The extrusion molding apparatus is an extrusion molding apparatus in which different inner and outer layers 11 and 12 are laminated by extrusion molding on the surface side of the pseudo bamboo main body 10 immediately after extrusion molding. In the pseudo-bamboo main body 10 for extrusion molding, and the inner layer 11 arranged in series in the extrusion direction adjacent to the mold 20 and arranged behind the mold 20 in the extrusion direction, A pair of inner and outer layer extrusion molds 21 for extrusion molding with a predetermined thickness in the outer peripheral direction of the bamboo body 10 and for the outer layer 12 arranged forward in the extrusion direction, for the extrusion of the thickness change in the outer peripheral direction of the pseudo bamboo body 10; 22 and the control means for changing the thickness of the pseudo bamboo body 10 in the longitudinal direction for increasing / decreasing the amount of resin discharged to the outer layer extrusion molding die 22 in the series pair.

  That is, pseudo bamboo A is, for example, a pseudo bamboo main body extrusion process for extruding the pseudo bamboo main body 10 and an inner / outer colored layer extrusion process for forming inner and outer colored layers 11 and 12 having different colors immediately after the extrusion molding in two layers. And a bamboo knot forming step for forming the bamboo rib-like projecting ribs 16 on the pseudo bamboo body 10 in this example, and immediately after that, after the air cooling or the water cooling steps as necessary, according to the use. This is manufactured by a manufacturing method including a series of cutting steps for cutting to a predetermined length. At this time, the extrusion die 20 of the pseudo bamboo body 10 and the inner and outer colored layers 11 and 12 are extruded into the extrusion molding apparatus. A pair of molding dies 21 and 22 are arranged in series in the extrusion direction of the pseudo bamboo main body 10 and the pseudo bamboo main body extrusion step and the two inner and outer colored layer extrusion steps are continuously and simultaneously performed in the same extrusion molding apparatus. As a thing.

  Of the pair of molds 21 and 22 for extruding the inner and outer colored layers 11 and 12, the inner layer extruding mold 21 at the rear in the extrusion direction has, for example, a circular shape whose shape is similar to the pseudo bamboo main body 10. On the other hand, the outer layer extrusion molding die 22 at the front in the extrusion direction has a substantially circular shape, for example, with the molding surface dissimilar to the pseudo-bamboo body 10, but the outer circumferential direction is entirely or partially uneven. An irregularly shaped surface having a surface similar to a circular shape is formed, and the formation of the inner and outer colored layers 1 and 12 by these molds 21 and 22 is substantially equal to the thickness of the pseudo bamboo body 10 through the mold 21. The inner layer 11 coated with the pseudo-bamboo main body 10 by extrusion molding and the outer layer 12 having a different thickness by changing the thickness in the outer peripheral direction through the mold 22 are also extruded and coated with the same. To change the color tone in the outer circumferential direction. It is possible to form the surface pattern 13.

  At this time, the extrusion molding apparatus of this example controls the increase and decrease of the resin discharge amount of the outer layer 12 with respect to the extrusion molding die 22 of the outer layer 12 by the control means (not shown), and thereby the longitudinal length of the pseudo bamboo body 10 is increased. A single color tone part and a composite color tone part are also arranged in the direction so as to make the natural bamboo natural tone color change pattern 13 as much as possible. The control is performed in several steps, and the resin amount of the outer layer 12 is changed in the longitudinal direction of the pseudo bamboo body 10 along with the change in the thickness in the outer peripheral direction due to the molding surface of the mold 22, and the outer layer 12 is increased when it is increased. And the color tone is the single color tone of the outer layer 12 in the same manner as described above, and the thickness is reduced when decreasing, and the color tone is the composite color tone of the inner and outer colored layers 11 and 12 as described above. The above-mentioned pseudo bamboo body In addition to the outer circumferential direction of 0 arranged in the longitudinal direction, thereby are the color tone of 擬竹 A as a mottled so as possible live up to the color tone of the natural bamboo. The increase / decrease control of the resin discharge amount can be performed, for example, by changing the rotation pressure of the screw that discharges the resin of the outer layer 12 to the mold 22 and changing the discharge pressure thereof. What is necessary is just to set it as the control apparatus etc. of the screw speed which changes a number in steps or steplessly within a predetermined range.

  In FIG. 3, the arrow indicates the direction of extrusion, 20a is a molding hole of the pseudo bamboo body 10 in the extrusion mold 20, 21a and 22a are the resin supply ports of the inner layer forming mold 21 and the outer layer forming mold 22, respectively. Similarly, the molding holes of the inner layer 11 and the outer layer 12 are shown.

  The supply of raw material resin to the extrusion equipment, the conditions of extrusion molding, the specific extrusion method, etc. may be carried out according to the conventional method of extrusion molding according to the raw material resin. The inner and outer colored layers 11 and 12 that are also heated and softened are supplied to the artificial bamboo body 10 in a state of being laminated, so that the artificial bamboo body 10 and the inner layer 11, and the inner layer 11 and the outer layer 12 are mutually gelled. The pseudo bamboo body 10 and the inner and outer colored layers 11 and 12 are not peeled off, and the inner and outer colored layers 11 and 12 are not peeled off from each other.

  The bamboo knot forming process of this example is, for example, a bamboo knot that moves in the extrusion direction at the same speed as the extrusion speed of the pseudo bamboo body 10 in the heat softened state immediately after the inner and outer colored layers 11 and 12 are formed on the pseudo bamboo body 10. A projecting rib that bulges and protrudes in the outer peripheral direction by sucking the pseudo-bamboo body 10 into a knot forming groove of the mold by holding the pseudo-bamboo body 10 between upper and lower molds for molding and vacuum-sucking it to a predetermined position in the longitudinal direction 16 is formed, and at this time, a pair of the node forming grooves formed in the upper and lower molds in the present example are arranged in the front and rear in the extrusion direction, and the width of the pair of node forming grooves is respectively arranged at the time of vacuum suction. The movable core is narrowed by moving it in the opposite direction, and vacuum suction is performed with the meat of the pseudo bamboo body 10 sandwiched between them, and each pair is narrow in the longitudinal direction like a natural bamboo bamboo knot. And the tapered protruding rib 16 and Is as provided with a further natural feeling with the surface pattern 13 of the color change.

  Although the illustrated example is as described above, the surface pattern of the color change is changed to the shade of the color tone or by using a plurality of colors together with this, the color change in the longitudinal direction is omitted, and the pseudo bamboo body in the outer circumferential direction is omitted. Including pseudo bamboo with surface pattern of color change, pseudo bamboo body, inner and outer colored layers, single color part of outer layer, composite color part of inner and outer colored layer, surface pattern of color change by these, extrusion molding Specific materials, shapes, structures, methods, devices, relations, additions to these, etc. of the device, the mold for extrusion molding or extrusion molding of the inner and outer colored layers, and the control means for increasing / decreasing the resin discharge amount, Various forms can be employed without departing from the gist of the invention.

It is a partially cutaway perspective view of pseudo bamboo. It is a model longitudinal cross-sectional view of pseudo bamboo. It is a model longitudinal cross-sectional view of the metal mold | die in an extrusion molding apparatus.

Explanation of symbols

A Pseudo bamboo 10 Pseudo bamboo body 11 Inner layer 12 Outer layer 13 Surface pattern 14 Single tone part 15 Compound tone part 16 Protruding rib 20 Pseudo bamboo extrusion mold 21 Inner layer forming mold 22 Outer layer forming mold

Claims (5)

  By changing the wall thickness of the outer layer of the inner and outer colored layers formed on the surface side of the pseudo-bamboo body in two layers of different colors inside and outside, by changing the thickness of the outer layer toward the outer periphery of the pseudo-bamboo body, the individual color tone part and thin part of the outer layer A synthetic resin pseudo-bamboo, characterized in that a color change pattern in the outer peripheral direction due to the composite color tone portion of the inner and outer colored layers is exposed on the surface.   2. The synthetic resin according to claim 1, wherein the color change pattern in the outer peripheral direction is changed to a color change pattern which is discontinuous in the longitudinal direction by changing the thickness of the outer layer in the longitudinal direction of the pseudo bamboo body. Made artificial bamboo.   The inner and outer colored layers of different colors inside and outside are laminated on the surface side of the pseudo-bamboo body immediately after extrusion molding by extrusion, and the outer layer of the inner and outer colored layers is formed by extrusion molding. The composition is characterized by displaying on the surface a color change pattern in the outer peripheral direction due to a single color part of the outer layer due to the thick part and a composite color part of the inner and outer colored layers due to the thin part by changing in the outer peripheral direction. A method for forming a surface pattern of resin-made artificial bamboo.   The extrusion molding of the outer layer is also performed by changing the longitudinal direction of the pseudo bamboo main body so that the color change pattern in the outer peripheral direction is exposed on the surface as a color change pattern that is discontinuous in the longitudinal direction. 3. A method for forming a surface pattern of synthetic resin pseudo-bamboo according to item 3.   An extrusion molding apparatus for extruding by stacking different inner and outer layers by extrusion molding on the surface side of the pseudo-bamboo body immediately after extrusion molding, the mold for extrusion molding of the pseudo-bamboo body, and the mold Adjacent to each other in series in the extrusion direction and for the inner layer arranged behind the mold in the extrusion direction, the pseudo bamboo body is used for extrusion with a predetermined thickness in the outer circumferential direction and for the outer layer arranged in front of the extrusion direction. A pair of series inner and outer layer extrusion molds for extrusion molding with an outer wall thickness change, and a pseudo bamboo body longitudinal wall thickness change control for increasing and decreasing the resin discharge amount to the outer layer extrusion mold in the series pair And a synthetic resin pseudo-bamboo extrusion molding apparatus.

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