MOLD AND MANUFACTURING METHOD

Abstract

A mold equipped with a core having a plurality of columnar distal portions branched at a downstream side in the extrusion direction and arranged on a surface and a die having an aperture surrounding the distal portions as a whole with a distance with respect to the distal portions and used in the case where a softened flexible resin is injected from one end of a resin flow path formed between the core and the die and a pipe material having a plurality of liquid flow paths which are mutually independent formed by the flexible resin is extruded from the other end of the resin flow path, wherein the aperture of the die has a shape in which each part of a plurality of circles each having the same axis as a corresponding one of the distal portions and mutually having the same inner diameter are overlapped and mutually connected, and each of a diameter of a distal portion of the core is lager than or equal to a diameter of a distal portion adjacent to the outer side in the arrangement.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is a perspective view showing a shape of a multi line tube 100 extrusion-molded by a mold 300 according to an embodiment.

FIG. 2 is a diagram schematically showing a structure of an extrusion molding equipment 200 for manufacturing the multi line tube 100 shown in FIG. 1.

FIG. 3 is a perspective view separately showing a shape of a core plate 310 of the mold 300.

FIG. 4 is a perspective view separately showing a shape of a die plate 320 of the mold 300.

FIG. 5 is a perspective view showing a state in which the above described core plate 310 and the die plate 320 are built up.

FIG. 6 is a perspective view separately showing a shape of lip plate 330 of the mold 300.

FIG. 7 is a perspective view showing a structure of the mold 300 with which the lip plate 330 is combined.

FIG. 8 is a diagram showing a shape of a distal portion 340 of a core at an extrusion opening 334 of the mold 300.

FIG. 9 is a diagram showing a shape of a distal portion 340 of a core at the extrusion opening 334 of the mold 300 in another embodiment.

Claims

1. A mold equipped with a core having a plurality of columnar distal portions branched at a downstream side in the extrusion direction and arranged on a surface and a die having an aperture surrounding the distal portions as a whole with a distance with respect to the distal portions and used in the case where a softened flexible resin is injected from one end of a resin flow path formed between the core and the die and a pipe material having a plurality of liquid flow paths which are independent formed by the flexible resin is extruded from the other end of the resin flow path, wherein the aperture of the die has a shape in which each part of a plurality of circles each having the same axis as a corresponding one of the distal portions and mutually having the same inner diameter are overlapped and mutually connected, andeach of a diameter of a distal portion of the core is lager than or equal to a diameter of a distal portion adjacent to the outer side in the arrangement.

2. The mold according to claim 1, wherein distal ends of the distal portions of the core extend to the outer side of the die form the aperture of the die.

3. The mold according to claim 1, wherein the core includes a proximal portion mutually connected with the distal portions.

4. A manufacturing method of a pipe material using a mold equipped with a core having distal portion branched into a plurality of portions at a downstream side in the extrusion direction and arranged on a surface and a die having an aperture surrounding the distal portions as a whole with a distance with respect to the distal portions and injecting a softened flexible resin from one end of a resin flow path formed between the core and the die and extruding a pipe material having a plurality of liquid flow paths formed by the flexible resin from the other end of the resin flow path, wherein the aperture of the die has a shape in which each part of a plurality of circles each having the same axis as a corresponding one of the distal portions and mutually having the same inner diameter are overlapped and mutually connected, andeach of a diameter of a distal portion of the core is lager than or equal to a diameter of a distal portion adjacent to the outer side in the arrangement.