JPH03222721A - Variegated pattern processing device, and manufacture of thermoplastic resin pipe provided with crest pattern by use of same - Google Patents

Abstract

PURPOSE:To enable variegated patterning of the surface of a pipe by a single process, by a method wherein a rotary mold is arranged so that a roll surface having a sectional form obtained by dividing a circle, whose diameter is the same as the outside diameter of a work pipe or smaller than that, into at least two is positioned on the same circumference. CONSTITUTION:A groove of a roll has a sectional form obtained by dividing a circle, whose diameter is the same as the outside diameter of a work pipe or a little smaller than that, into at least two arcs. To position roll surfaces each on the same circumference four rotary molds 31-34 are arranged on all sides so that they abut against an outer circumference of a work pipe 10. The work pipe 10 is passed through between heater 23 by a feed roll 21, the surface of the work pipe 10 is preheated at the softening point or higher and sent into a tie-dying processing device. The work pipe 10 is fed forward by a rotation of the rotary mold while the whole circumference is abutting against roll surfaces of the four rotary molds 31-34. A variegated is formed on the surface of the pipe 10.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a processing device for forming a drawing pattern on the surface of a pipe or tube (hereinafter referred to as a pipe), and a thermoplastic resin vibrator with a drawing pattern using the same. Regarding the manufacturing method.

[Prior Art] Conventionally, methods such as extrusion blow molding and surface excavation have been used to manufacture thermoplastic resin vibes having a drawing pattern on the surface. Furthermore, in the case of foamed resin tubes, methods such as wrapping a resin film with a squeeze pattern around the surface have been adopted.

These methods have the drawbacks of requiring large-scale equipment, high cost, and a large number of steps.

[Problems to be Solved by the Invention] The main object of the present invention is to provide a drawing pattern processing device that can form a drawing pattern on the surface of a pipe in a single step.

Another object of the present invention is to provide a method of drawing and processing a thermoplastic resin pipe using the above-mentioned drawing pattern processing apparatus.

[Means for Solving the Problems] According to the present invention, the roll surface has a concavo-convex pattern in a cross-sectional shape obtained by dividing a circle having the same diameter as the outer diameter of the vibrator to be processed or a diameter slightly smaller than the outer diameter into two or more parts. A processing device is provided with a drawing pattern characterized in that it has two or more rotary molds forming a part, and the rotary molds are arranged so that each roll surface is located on the same circumference. be done.

Furthermore, according to the present invention, a roll having a cross-sectional shape in which a thermoplastic resin pipe whose surface has been preheated to a softening point or above is divided into two or more circles each having the same diameter as the outer diameter of the pipe or a diameter slightly smaller than the outer diameter. A mold is manufactured using a processing device that has two or more rotary molds each having a concavo-convex portion with a drawing pattern formed on their surfaces, and the rotary molds are arranged so that each roll surface is located on the same circumference. Provided is a method for manufacturing a thermoplastic resin pipe with a drawing pattern, which is characterized in that it is continuously extruded by rotating the pipe.

[Function] With the processing apparatus of the present invention, it is possible to continuously form a uniform and beautiful drawing pattern on the surface of a thermoplastic resin pipe or a foamed resin tube having a thermoplastic resin layer as a skin layer.

In place of the conventional method of continuously molding along the mold while blow-molding the to-be-molded object with a belt-type mold, or the surface excavation method, the present invention utilizes extrusion using a rotary mold to surface the to-be-molded object. The shibori pattern is processed.

[Example] As shown in FIG. 1, the drawing pattern processing apparatus of the present invention includes four rotary molds 31 to 34 arranged on all sides so as to be in contact with the outer periphery of the vibrator 10 to be processed, and The mold is equipped with a drive mechanism (not shown) that rotates the mold in the direction of the arrow in the figure.

The rotary molds 31 to 34 each have a U-shaped groove 35 on the outer peripheral surface (roll surface) corresponding to the circumference of the vibrator 10 to be processed,
As shown in FIG. 3, a concavo-convex portion 36 is formed on the inner surface of the groove to form a drawing pattern.

Note that the groove 35 of the roll is formed by dividing a circle having a diameter equal to or slightly smaller than the outer diameter of the vibrator to be processed into two or more arcs, preferably four to eight arcs depending on the number of rotary molds. Any cross-sectional shape is sufficient. Also.

This drawing is done by circulating a cooling medium inside the rotary molds 31 to 34 in the processing equipment, or by providing a cooling device such as spraying a coolant from the outside of the rotary molds 31 to 34, which disturbs the drawing pattern on the pipe. This is preferable in that it can be formed without any problems.

Next, with reference to FIG. 2, a method for manufacturing a thermoplastic resin pipe with a drawing pattern using the above-mentioned drawing processing apparatus will be described.

Thermoplastic resins such as polyvinyl chloride, low density polyethylene, high density polyethylene, linear low density polyethylene,
Ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, polypropylene or derivatives thereof,
A workpiece vibrator 10 made of thermoplastic elastomer or a mixture of these materials is passed between heaters 23 by a feed roll 21 to preheat its surface to a temperature above its softening point, and then the above-mentioned tightening is performed by a processing device. Send it in.

Here, the to-be-processed vibrator 10 having a softened surface is sent forward by the rotation of the four rotary molds 31 to 34 while its entire circumferential surface is in contact with the roll surfaces of the four rotary molds 31 to 34 . Due to contact with the roll surfaces of the rotary molds 31 to 34, the pipe 1
A shibori pattern is formed on the surface of 0. The pipe 10 which has been drawn in this manner is cooled by a cooler 25 and sent out as a product by a take-up roll 27.

In the process shown in Figure 2, the workpiece vibrator is designed to move laterally, but in some cases the workpiece vibrator is cut to an appropriate length or the workpiece vibrator is made of a flexible material. In the case of a coated foamed resin tube, the vibrator to be processed can be designed to move vertically and the product can be wound up.

Furthermore, in the case of the drawing pattern of the present invention, the heater 23 for preheating can be omitted if the processing device is installed next to the pipe extrusion molding machine.

[Effects of the Invention] As described above, the apparatus of the present invention has the advantage that it has a simple configuration, is easy to operate, and can process small lots. Furthermore, the design of the drawing pattern on the roll surface can be easily changed by appropriately replacing the rotary mold that forms the drawing pattern on the roll surface.

Further, according to the method of the present invention, a predetermined drawing pattern can be formed on the surface of the thermoplastic resin vibrator in a single step of preheating the surface and continuously feeding the vibrator into the upper e device.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the processing device for the choking pattern bones of the present invention, and FIG. Figure 3 [A] shows the shape of the rotary mold that constitutes the processing device in Figure 1,
No. 11 (Bl is a sectional view of the above-mentioned rotating metal along line B. The vibrator to be processed, the feed roll, the heater, the cooler, the take-up roll, the drawing pattern bone is the processing device, and the mold B 0 21... 23... 25. 27...0 31-34 Rotating mold, 35... Groove, 6 Uneven part.

Claims (2)

[Claims] (1) Two or more rotary molds formed by forming uneven parts in a drawing pattern on the roll surface with a cross-sectional shape obtained by dividing a circle with the same diameter as the outer diameter of the pipe to be processed or slightly smaller than the outer diameter into two or more parts. 1. A drawing pattern forming processing apparatus, characterized in that the rotary mold is arranged so that each roll surface is located on the same circumference. (2) A thermoplastic resin pipe whose surface has been preheated to a softening point or above is divided into two or more circles with the same diameter as the outside diameter of the pipe or slightly smaller than the outside diameter, and a drawing pattern is formed on the roll surface. By rotating the mold using a processing device having two or more rotary molds each having an uneven portion and arranging the rotary molds so that each roll surface is located on the same circumference. , a method for producing a thermoplastic resin pipe with a drawing pattern, characterized by continuous extrusion.