JPS59230726A - Method and apparatus for manufacturing synthetic resin tube - Google Patents

Abstract

PURPOSE:To obtain a synthetic resin tube with a irregular pattern by extruding a melted synthetic resin different in color in the circumferential direction of an annular die while turning the annular die about the axis thereof. CONSTITUTION:A colorless transparent melted resin is fed from an inlet 6a, a white opaque melted resin from an inlet 6b and a blue opaque melted resin from the other inlet. The resin fed from the inlet 6a is branched off into paths 71a-73a, where the resin via the path 71a is fed annularly to the outside of the side of a path 12 while the resin via the path 73a is fed to the inside of the side of the path 12. Then, the colorless transparent resin from the path 92a, the white opaque resin from the path 9b and the blue opaque resin from the other path are fed alternately in the circumferential direction between these transparent resins outside and inside via a channel 11a depending on the arrangement of a through hole 10a and the channel 11a. As the shaft 1 is rotated, a cylinder with an irregular blue-white pattern is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a synthetic resin tube, and particularly to a tube capable of producing an irregular pattern on its surface.

Conventionally, methods and apparatus for manufacturing synthetic resin tubes have been made by extruding synthetic resin using, for example, a circular die. However, although it is easy to create a striped pattern in the circumferential direction of the tube, it has not been considered to create other patterns, especially irregular patterns.

Therefore, the present invention aims to provide a method of manufacturing a synthetic resin tube with an irregular pattern and an apparatus therefor.

An embodiment of this invention will be described in detail below with reference to the drawings.

Reference numeral 11 denotes a rotary annular die mounting rotation shaft, the center of which is hollow, and accommodates a non-rotating cooling water supply channel 1a and a drainage channel 1b.

Reference numeral 2 denotes a gear integral with the shaft 1, and is constructed so that the shaft 1 can be rotated by transmitted power from a power source (not shown).

3 is a support part, and between it and the shaft 1 is a thrust washer 4;
A bushing 5 is interposed and supports the shaft 1 on the support portion 3 with a loose fit. Further, on the outer periphery of the support part 3, there is a 6
a16b+60 (only two locations are shown in the figure, but three locations in total in this embodiment) are opened.

The resin supply passage in the support part 3 connected to the inlet 6a is branched into three annular passages 71a, 72a, and 73a, and the inlet 6b is connected to the resin supply annular passage 7b in the support part 3, and an inlet 6C (not shown) is connected to the resin supply passage 7b in the support part 3. Support part 3
It communicates with the resin supply annular passage 7C.

Furthermore, these fixed side annular passages 72a, 73a+7
b and 7C and the resin supply annular passage in the rotating part 1C integrated with the rotating shaft 1 are communicated at four cylindrical periphery contact sliding parts 8 between the support part 3 and the rotating part 10. That is, the passage 72a is connected to the passage 92a of the rotating part 1C, the passage 73a is connected to the passage 93a of the rotating part 1C, the passage 7b is connected to the passage 9b of the rotating part 1C, and the passage 7C is connected to the passage 9C of the rotating part 1C.
are connected to each other via portions 8.

These annular passages are constructed so that the distance from the entrance of each resin supply passage is constant (although details are not shown).

Furthermore, the outlet ends (left end in FIG. 1) of the annular passages 92a, 9 and 9C are arranged circumferentially by a through hole 10a bored in a distribution plate 1o fixed integrally with the rotating part 1C. communicated with each other. That is, the through hole 10a is as shown in the figure.
For passage 92a, a position on the same pitch circle and 8 equal circumferences; for passage 9b, a position on the same pitch circle and 4 equal parts of the circumference; for passage 9C, a position on the same pitch circle and on the circumference The holes are arranged in four equal positions, but each hole is configured with different phases.

Further, the outlet end (left end in FIG. 1) of these through holes 10a is connected to a convergent plate 1 fixed integrally with the rotating part 1C.
1 convergence groove 11a to the center.

In this way, the end surface 3a of the support part 3 and the front of the convergence plate 11 (the first
(Left side of the figure) The end surface shall slide against each other on an annular surface.
In addition to the inner outlet end 11b of the convergent groove 11a, the outlet ends of the passages 71a and 93a are opened near the inner periphery of the annular sliding portion. The outer periphery of the water pipe fixedly installed inside the rotary shaft 1 and the inner periphery of the support portion 3 constitute an annular passage 12 communicating with these outlet ends and its front outlet end 12a.

As a result of the above, it should be understood that in FIG. 1, the hatched portion at 45 degrees downward to the right is a rotating portion, and the other portions are fixed portions.

The effects of the above-mentioned embodiments will be described below.

Now, from the inlet 6a, the colorless and transparent molten synthetic resin is poured into the inlet 6b.
A white opaque molten synthetic resin is pumped through the inlet, and a blue opaque molten synthetic resin is pumped through an inlet 6C (not shown).

The colorless and transparent resin from the inlet 6a is a passage 71a.

Branches into 72a and 73a. The transparent resin that has passed through the passage 71a is annularly supplied to the outer side of the passage 12, and the transparent resin that has passed through the passage 73a is supplied to the inner side of the passage 12. Then, between these outer and inner transparent resins, colorless transparent resin from the passage 92a, white opaque resin from the passage 9b, and blue opaque resin from the passage 9C pass through the groove 11a and the groove 10a. 11a are arranged alternately in the circumferential direction.

If the synthetic resin tube is extruded in this state while extruding the resin while keeping the shaft 1 fixed, a tube with a striped pattern in the circumferential direction will be formed. However, when the shaft 1 is rotated, a tube with an irregular blue-white pattern is formed. This pattern will never be the same twice, and will change depending on the various conditions at the time (
Please refer to the actual item attached for reference).

In addition, as described in the operation section, in the above embodiment, the inlet 6
A case has been described in which a colorless and transparent molten synthetic resin is pumped through a, a white and opaque molten synthetic resin is pumped through an inlet 6b, and a blue and opaque molten synthetic resin is pumped through an inlet 6C (not shown).

Here, the transparent material does not necessarily have to be colorless, and as long as the white non-transparent material and the blue non-transparent material are also non-transparent, the respective color tones may be selected in any way.

When passing through the flow path as shown in FIG. 1, the annular body in the annular passage 12 has a transparent resin layer forming an inner layer and an outer layer, and non-transparent resin and transparent resin represented by white and blue colors are alternately separated in the circumferential direction. It is composed of three layers, an intermediate layer consisting of one continuous layer and one continuous layer.

In other words, shear to the wall surface is not directly applied to the intermediate layer on which the pattern is formed, but is applied indirectly through the outer layer made of a more transparent transparent resin. It is therefore understood that a suitable irregular pattern can be formed without the colored intermediate layer undergoing any significant orientation with respect to the flow direction.

As described above, the present invention has a simple structure and can produce a synthetic resin cylinder with an irregular pattern.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of this invention, and Fig. 2 is a side view of the first embodiment of the present invention.
FIG. 3 is a view taken along arrows II--II in the figure, and FIG. 3 is a view taken along arrows ■-m in FIG. DESCRIPTION OF SYMBOLS 1... Annular gouy attachment rotating shaft, 3... Support part, 12...
...Annular passage, 92a, 9bt9C...Resin supply passage, 6a+6b+6C...Resin supply passage. Patent applicant: Plastic Engineering Research Institute Co., Ltd. (and 1 other
Name) Note 2 Figure 3

Claims (1)

[Claims] (1) A method for manufacturing a synthetic resin tube with an irregular pattern, which comprises extruding molten synthetic resin in different colors in the circumferential direction of an annular die and rotating the annular die around its axis. . (2) The molten synthetic resin is extruded in different colors in the circumferential direction of the annular die, and at the same time, the molten synthetic resin with higher transparency is extruded outside of the molten synthetic resin. A method for producing a synthetic resin tube having an irregular pattern. (A plurality of resin supply passages are communicated with the outlet annular passage of the three-rotation annular die, and the plurality of resin supply passages are separately communicated with the annular passage in the circumferential direction, and further, these resin supply passages This is an apparatus for producing synthetic resin tubes with irregular patterns, which is supplied with resin materials of different colors.