JP2620201B2 - Tube manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a synthetic resin tube.

[0002]

2. Description of the Related Art As a method of manufacturing a synthetic resin tube, a tape mainly composed of a synthetic resin is wound in several layers around the outer peripheral surface of a core using a metal tube or the like, and the tape is integrated by heat fusion. There is a method of obtaining a tube by extracting a core from a double-layered product of the obtained tube and the core. As a method of pulling out the core, as shown in FIG.
A method is used in which a die 13 having a cavity 13a through which the tube 11 is passed but not through the tube 11 is provided, the tube 11 is blocked by the thick portion 13b of the die, and only the core 12 is pulled out through the cavity 13a. According to this method, the pressure applied by being blocked by the tube Hurghada chair, as shown, there is a problem that deformed 11a as the thickness of the tube is wavy.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a tube from being easily deformed when a core is pulled out of a two-layered structure composed of a tube and a circular long core.

[0004]

1 SUMMARY OF THE INVENTION, referring to FIG. 2, the present invention, the tube 1 of a synthetic resin covers the outer peripheral surface of the core body 2 of circular shape elongated, tube and core Using a die 3 having a cavity 3a that allows only the core 2 to pass through the two-layer body composed of the body, the passage of the tube 1 is interrupted by the thick portion 3b of the die, and only the core 2 is formed in the cavity 3a. was so withdrawn is passed, contact the device with a core pulling die 3, the outer Hikarada 4 for coating the outer peripheral surface of the tube 1 of the two-layer product, the end on the die 3 The present invention relates to a tube manufacturing apparatus characterized by being provided. In the figure, reference numeral 5 denotes a chuck for gripping the core 2 to pull it out.

[0005]

[Action] tubeAnd circleA two-layer structure consisting of a long core
If the body is left naked, pull out the core
Deformation of the tube as shown in FIG.
Cover the outer peripheral surfaceOutsideThe body 4 is provided in contact with the die 3
By this, thisOutsidePressed down from around by the body,
The deformation of the tube is prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A metal tube is used as a core, a tape mainly made of synthetic resin is wrapped around several layers, the whole is heated, and the tape is integrated by heat fusion to form a tube. To obtain a two-layered product consisting of Other circular long objects such as metal rods can be used for the core. The die used to pull out the core from the two-layered material may have any shape as long as it has a space through which the core passes but does not pass through the tube.

As the jacket 4, in addition to the cylinders shown in FIGS. 1 and 2, a rectangular cylinder shown in FIG. 3A, a halved cylinder shown in b, a halved cylinder shown in c, and the like can be used. These are usually made of metal, but other materials such as synthetic resin can also be selected. The inner diameter of the jacket is such that the two-layer object can slide in the jacket. The length of the jacket may be any length as long as deformation of the tube can be prevented.

[0008]

According to the present invention, the deformation of the tube which is likely to occur when the core is pulled out from the two-layered structure composed of the tube and the circular long core can be prevented. , it is possible to obtain the deformation of a position cube.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of the device of the present invention.

FIG. 2 is a sectional view taken along the line II-II shown in FIG.

FIG. 3 is a sectional view showing another example of a jacket used in the apparatus of the present invention.

FIG. 4 is an explanatory view of a conventional tube manufacturing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... tube, 2 ... core, 3 ... dice, 3a ... void part, 3b ... thick part, 4 ... jacket, 5 ... chuck.

Claims (1)

(57) [Claims] 1. A synthetic resin tube covers the outer peripheral surface of the core of a circular elongated, with respect to two-layer material consisting of a tube and the core, the die having a gap portion capable of passing only the core By using, the passage of the tube is interrupted by the thick part of the die, so that only the core is pulled out through the gap, the apparatus having a core withdrawal die, the outer peripheral surface of the tube of the two-layered material A tube manufacturing apparatus, wherein an outer jacket for coating is provided with its end abutting on a die.