JP2005125645A - Method and apparatus for manufacturing dummy bamboo - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a dummy bamboo, which prevent a streak pattern (parting line) from being conspicuous, and which prevent the apparatus from being greatly upsized. <P>SOLUTION: When a molten resin 1 extruded from an extrusion mold 2 is regulated and cooled, a plurality of pairs of molding dies 3, wherein an outer peripheral shape of a bamboo is engraved, are joined together and moved with the resin in a pull-out direction. The molding die 3 is set to have a length almost equivalent to a distance between bamboo joints, and connected to a looped carrier base 4 via a part of a section with the length; and the carrier base 4 is rotatively driven. In the manufacturing method for the dummy bamboo, since the molding die is set to have the length almost equivalent to the distance between the bamboo joints, the streak pattern (parting line) can serve as a joint part of the dummy bamboo, and can be prevented from being conspicuous. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a simulated bamboo and an apparatus for manufacturing the same.

  Conventionally, there has been the following method for producing simulated bamboo (see Patent Document 1). That is, a hard resin pipe is first molded, and the outer periphery thereof is covered with a soft resin so that the shape of the node is formed by a mechanical method. However, such a method that mechanically raises the node by secondary processing can only form a relatively simple shape, and it can be distinguished at a glance if it is an artificial bamboo rather than a natural bamboo. It was.

  Therefore, the present inventor made the following proposal (see Patent Document 2).

  As shown in FIG. 4, in the method of manufacturing the simulated bamboo, when the molten resin 22 extruded from the extrusion die 21 is regulated and cooled, the outer shape of the natural bamboo is engraved and arranged in a loop shape. A plurality of molding dies 23 (about 50 mm in length) are moved in the take-up direction together with the resin. According to this method, there is an advantage that a simulated bamboo B having a realistic appearance close to that of natural bamboo can be formed by restricting when the resin is melted by the molding die 23 in which the outer shape of natural bamboo is engraved. is there.

  By the way, the streak pattern (parting line) at the boundary between both ends of the molding die 23 is left on the product, but this is not very good. Therefore, in order not to reduce the commercial value, the streak pattern should be made as inconspicuous as possible by appearing at the joint of the simulated bamboo B. In other words, it is desirable that the length of the molding die 23 is set to a length that is approximately the same as the interval between bamboo joints.

However, if the molding die 23 is set to such a length as described above, the wheel diameter of the carrier base 24 of the molding die 23 arranged in a loop shape becomes large, resulting in a problem that the apparatus becomes considerably large. It was. In addition, when the wheel diameter of the carrier base 24 is increased, it is necessary to lengthen the die of the extrusion die 21, and the pressure inside the die becomes abnormally high at the time of molding, and the resin temperature rises rapidly, so that the molding becomes unstable. is there.
Japanese Patent Laid-Open No. 11-291326 (pages 1 to 3, FIG. 1) Japanese Patent Laid-Open No. 2002-67126 (pages 1 to 3, FIG. 7)

  Therefore, the present invention intends to provide a method for manufacturing a simulated bamboo and an apparatus for manufacturing the same, in which streak patterns (parting lines) are not conspicuous and the apparatus is not so large.

In order to solve the above problems, the present invention takes the following technical means.
(1) In the method of manufacturing a simulated bamboo according to the present invention, when the molten resin extruded from the extrusion mold is regulated and cooled, a plurality of pairs of molding dies engraved with the outer shape of the bamboo are joined. The mold is moved in the take-up direction together with the resin, and the molding die is set to a length approximately equal to the internode distance of the bamboo, and is connected to a loop-shaped carrier base at a part of the length. The base is driven to rotate.

  In this simulated bamboo manufacturing method, the mold was set to the same length as the distance between bamboo joints, so the streak pattern (parting line) can be the joint of simulated bamboo. It can be inconspicuous.

  In addition, since the molding die is connected to the loop-shaped carrier base at a part of its length, even if the molding die is set to a length that is about the same as the internode distance of the bamboo, it is longer than before. In the loop region of the carrier base, the mold is connected to the carrier base at a part of its length, but the unconnected region can be separated from the carrier base. It doesn't have to be big.

 (2) The simulated bamboo manufacturing apparatus of the present invention includes an extrusion mold for extruding molten resin, a length that is approximately the same as the distance between bamboo nodes, the outer shape of the bamboo is engraved, and the molten resin is regulated. A plurality of pairs of molding dies for cooling, a loop-shaped carrier base to which the molding dies are connected at a part of its length, and a drive mechanism for rotationally driving the carrier base. A pair of molding dies are joined and moved in the take-up direction together with the resin.

  In this simulated bamboo manufacturing equipment, the mold was set to the same length as the internode distance of the bamboo, so the streak pattern (parting line) can be the joint of the simulated bamboo. It can be inconspicuous.

  In addition, since the molding die is connected to the loop-shaped carrier base at a part of its length, even if the molding die is set to a length that is about the same as the internode distance of the bamboo, it is longer than before. In the loop region of the carrier base, the mold is connected to the carrier base at a part of its length, but the unconnected region can be separated from the carrier base. It doesn't have to be big. Since the wheel diameter can be reduced in this way, the mechanical equipment can be made compact and inexpensive, and the rotational weight can be reduced, so that the molding speed can be improved.

(3) The loop-shaped carrier base may be installed so that the molding die protrudes straightly into an escalator shape and is joined in the molten resin molding region.

  If comprised in this way, there exists an advantage that the angle | corner of a certain shaping | molding metal mold | die can contact | abut to another shaping | molding metal mold | die or resin diagonally, and it can suppress that it is damaged.

(4) The molding die may have an inner peripheral shape in which alternate longitudinal grooves are also formed for every section of bamboo, and the molding dies may be alternately arranged.

  If comprised in this way, the simulated bamboo of the realistic external appearance which has alternately the groove | channel of the longitudinal direction which is staggered for every node of natural bamboo can be manufactured.

  The present invention is configured as described above and has the following effects.

  The streak pattern (parting line) can be made into a knot in the simulated bamboo, so it doesn't stand out, and the wheel diameter of the carrier base does not have to be so large, so the method of manufacturing the simulated bamboo does not make the device too large And a manufacturing apparatus thereof.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the manufacturing apparatus for the simulated bamboo B (see FIG. 1) of this embodiment regulates the extrusion mold 2 (long die nozzle) for extruding the molten resin 1 and the molten resin 1. A plurality of pairs of molding dies 3 to be cooled, a loop-shaped upper and lower carrier bases 4 (a pair of upper and lower chains) to which the molding dies 3 are connected at a part of their lengths, and the carrier base 4 And a drive mechanism (AC servomotor and gears, chains, etc., not shown).

  The molding die 3 is set to a length similar to the internode distance of natural bamboo (about 100 to 400 mm, preferably about 200 to 300 mm), and formed so that the knot pattern 5 is located at both ends thereof. Yes. Further, the outer peripheral shape of one node of natural bamboo is engraved on the inner peripheral surface of the molding die 3 set to a length approximately equal to the internode distance of natural bamboo. Further, the molding die 3 has an inner circumferential shape in which longitudinal grooves 6 (see FIG. 3, the backside groove 6 is indicated by a broken line) are alternately formed for each section of natural bamboo. The molds 3 are alternately arranged on the carrier base 4.

  Here, the molding die 3 is connected to the loop-shaped carrier base 4 at a part of its length. Specifically, the connection region 7 with the carrier base 4 is about the length of the molding die 3. The length is set to one third, and the carrier base 4 is connected in the central region of the third. Specifically, the connection region 7 with the carrier base 4 is set to a length of about one third of the length of the molding die 3, and the carrier base 4 is connected to the carrier base 4 in the central region of the one third. I try to connect.

  Further, the upper and lower carrier bases 4 in the loop shape are formed in a plurality of pairs of molding dies 3 in a molding region of the molten resin 1 by projecting the molding dies 3 straightly from the respective oval main loops in an escalator shape. Are installed so that they are exactly facing and joining. At the time of manufacture, the plurality of pairs of molding dies 3 are opposed and joined to move in the take-up direction together with the resin.

  Resin cooling and regulation are sized by an internal pressure (air blow) method using an air plug 8 (air is blown into a die). Instead of such an air blow system, a vacuum suction system may be used. Further, the extruder 9 for the outer layer and the extruder 10 for the inner layer are used in combination so that a green resin layer such as natural bamboo is provided on the outer peripheral side and a yellow resin layer such as natural bamboo is provided on the inner peripheral side. I have to.

  As the resin to be used, ABS resin, PP resin, PVC resin, other extrudable thermoplastic resins, and recycled pellets thereof can be applied regardless of whether they are hard or soft.

  Next, the usage state of the simulated bamboo manufacturing apparatus of this embodiment will be described.

  In this method of manufacturing the simulated bamboo B, when the molten resin 1 extruded from the extrusion mold 2 is regulated and cooled, a plurality of pairs of molding dies 3 engraved with the outer peripheral shape of the bamboo are joined to form the resin. And the molding die 3 is set to a length approximately equal to the internode distance of the bamboo, and is connected to the loop-shaped carrier base 4 at a part of the length, The carrier base 4 is driven to rotate. That is, a plurality of pairs of molding dies 3 are cooled and regulated while moving in the take-off direction together with the extruded resin, and the bonded molding dies 3 are opened after the resin is cooled and solidified. Rotate in a loop.

  In this way, since the molding die 3 is set to a length that is about the same as the inter-node distance of natural bamboo, the streak pattern (parting line) can be only the joint of the simulated bamboo B. There is an advantage that it can be made inconspicuous. Specifically, the molding die 3 set to a length approximately equal to the internode distance of natural bamboo is formed so that the nodal pattern 5 is located at both ends thereof. The streaks formed at the boundary of the molding die 3 overlap with the positions of the knots of natural bamboo, making them inconspicuous. That is, the shape of the natural bamboo knot is carved at the adjacent positions of the molding dies 3 (both ends of the cooling mold), and the parting line can be overlapped with the knot to make it less noticeable.

  Further, since the molding die 3 is connected to the loop-shaped carrier base 4 at a part of its length, the molding die 3 has a length similar to the inter-node distance of natural bamboo and a conventional length (length). Even if it is set to be considerably longer than about 50 mm), in the arc region of the loop-shaped carrier base 4, the molding die 3 is connected to the carrier base 4 at a part of its length, but the region not connected is the carrier base 4. Therefore, there is an advantage that the wheel diameter of the carrier base 4 does not become so large and the corner device does not become so large. Since the wheel diameter can be reduced in this way, the mechanical equipment can be made compact and inexpensive, and the rotational weight can be reduced, so that the molding speed can be improved.

  Further, since the loop-shaped carrier base 4 is installed in the molding region of the molten resin 1 so that the molding die 3 protrudes straightly from the oval main loop into an escalator shape and joins, a plurality of pairs of molding dies There is an advantage that the mold 3 can be tightly joined and the corners of a certain molding die can be prevented from being obliquely abutted against other molding dies and resins to be scratched.

  Further, the molding die 3 has an inner peripheral shape in which longitudinal grooves 6 (see FIG. 3) that are staggered are formed at every node of the natural bamboo, and the molding die 3 is alternately formed on the carrier base 4. Since it arranged, there exists an advantage that the simulated bamboo B of the realistic external appearance which alternately has the groove | channel 6 of the longitudinal direction which alternates for every node of a natural bamboo can be reproduced.

  Since the joint can be made inconspicuous, it can be suitably applied to applications such as continuous molding of irregular shapes such as pseudo-trees in addition to simulated bamboo.

The side view explaining embodiment of the manufacturing apparatus of the simulated bamboo of this invention. The principal part enlarged view of the manufacturing apparatus of the simulated bamboo of FIG. The figure explaining the groove | channel of the longitudinal direction which is alternated for every clause of natural bamboo. The side view explaining the manufacturing apparatus of the conventional simulated bamboo.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molten resin 2 Extrusion die 3 Molding die 4 Carrier base 6 Groove

Claims (4)

When the molten resin extruded from the extrusion mold is regulated and cooled, a plurality of pairs of molding dies engraved with the outer periphery of the bamboo are joined and moved in the take-up direction together with the resin, The molding die is set to the same length as the internode distance of the bamboo and is connected to a loop-shaped carrier base at a part of the length, and the carrier base is driven to rotate. A method for manufacturing simulated bamboo. An extrusion mold for extruding the molten resin, a plurality of pairs of molds that are set to a length approximately equal to the internode distance of the bamboo, and the outer peripheral shape of the bamboo is engraved and the molten resin is regulated and cooled; and A loop-shaped carrier base to which a molding die is connected at a part of its length; and a drive mechanism for rotationally driving the carrier base, wherein the plurality of pairs of molding dies are joined together with the resin. An apparatus for manufacturing a simulated bamboo, characterized in that it moves in the take-off direction. 3. The simulated bamboo manufacturing apparatus according to claim 2, wherein the loop-shaped carrier base is installed so that a molding die protrudes straightly into an escalator shape and joins in a molten resin molding region. 4. The simulated bamboo manufacturing apparatus according to claim 2, wherein the molding die has an inner peripheral shape in which alternate longitudinal grooves are also formed for each node of the bamboo, and the molding dies are alternately arranged. 5.

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