JPH04117728U - Polybutene resin pipe manufacturing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a manufacturing device equipped with a presser roll that can prevent pipe deformation and manufacture resin pipes with high roundness in the production of polybutene resin pipes. [Structure] In a polybutene resin pipe manufacturing equipment consisting of an extruder, a pipe die, a vacuum water tank, a cooling water tank, and a take-off machine, the pipe 1 is used as a presser roll 2 in the vacuum water tank and the cooling water tank.
A roll having a radius of curvature R within a predetermined range with respect to the radius of the tube 1 and side guide portions 3 parallel to the outer diameter of the tube 1 with an interval within a predetermined range is installed. [Effect] Deformation of the polybutene resin pipe is prevented and the roundness can be significantly improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea was developed from the die when manufacturing polybutene resin pipes using the extrusion method. Equipped with a presser roll that can suppress deformation of the extruded molten resin tube during the cooling process. Regarding manufacturing equipment.

0002

[Conventional technology]

Polybutene resin is a polyolefin resin similar to polyethylene, polypropylene, etc. A resin with properties similar to polypropylene and polyethylene, with good toughness and creep It has excellent resistance and flexibility, and has better heat resistance than polyethylene. Because of this, it is attracting attention as a piping material for hot water supply.

0003 The production of polybutene resin pipes is based on the manufacturing of resin pipes such as polyethylene pipes and polypropylene pipes. Similar to the manufacturing process, as shown in Figure 2, pelleted polybutene resin is fed into the extruder 11. The polybutene molten resin heated and melted in the pipe die 12 and extruded through the pipe die 12 is It expands a little and contracts as it cools, so it is placed in a vacuum water tank 13 with reduced pressure. The outer diameter is constrained by a laser and molded to the specified dimensions. After that, in the cooling water tank 14 After cooling completely and stabilizing the dimensions, the pulling machine 15 takes it off at a constant speed, and the cutting machine 16 takes it out. Cut to a certain length.

0004 In this cooling solidification process, the polybutene resin pipe passes through the water tank, Since the tube is hollow, it has a large buoyant force, so the tube must be held in place with a presser roll in the aquarium. need to be restrained. On the other hand, polybutene resin is soft and easily deforms, especially during the molding process. A V-shaped roll 17 as shown in Fig. 3, which is commonly used for polyethylene resin pipes, etc. If the pipe 18 is deformed and becomes oval when used as a presser roll, etc. There is.

[0005]

[Problem that the idea aims to solve]

Polybutene resin pipes are constructed using butt fusion and polybutene resin pipe joints. Since fusion bonding is performed by hand, high roundness is required. On the other hand, resin pipes such as polyethylene have higher deformation resistance than polybutene resin pipes. Therefore, there is no particular problem even if a V-shaped roll is used as a presser roll. For this reason, in the production of resin pipes, it is generally held down with V-shaped rolls and side guides are used. Drol is installed to suppress deformation, but in the case of polybutene resin pipes, angular It has the disadvantage that it becomes

[0006] The purpose of this invention is to prevent the deformation of the polybutene resin pipes in the production of the above-mentioned polybutene resin pipes. We offer manufacturing equipment equipped with presser rolls that can manufacture polybutene resin pipes with high roundness. It is about providing.

[0007]

[Means to solve the problem]

The inventors conducted various studies to achieve the above objective. As a result, vacuum water Molded resin pipes are used as guide rolls (presser rolls) used in tanks and cooling water tanks. It has a radius of curvature R within a predetermined range with respect to the radius of , and a parallel part that serves as a side guide. By using the roll as a presser roll, it can be used in vacuum water tanks and cooling water tanks. We discovered that it is possible to suppress the deformation of polybutene resin pipes, and arrived at this idea.

[0008] In other words, this invention is applicable to extruders, pipe dies, vacuum water tanks, cooling water tanks, and drawing machines. In the manufacturing equipment for polybutene resin pipes made of As a rule, it has a radius of curvature R of +2% to -0.5% with respect to the radius of the pipe. A rod with parallel side guides spaced between +2% and -0.5% of the outer diameter. A new rule was set up.

[0009] In this invention, the radius of curvature R of the presser roll is +2 to the radius of the tube being cooled. % or -0.5% because if it exceeds 2%, the restriction of the pipe outer diameter becomes loose. The effect of suppressing pipe deformation is weakened, and good roundness cannot be obtained. Also, R is -0.5 If it is less than %, the presser roll may get caught in the pipe and cause operational trouble. It is et al. In addition, the distance between the parallel parts of the side guide part of the presser roll should be set to +2% or more of the outer diameter of the pipe. The reason for setting -0.5% is that if it exceeds 2%, the constraint on the outside diameter of the pipe will become loose and the pipe will deform. The deterrent effect is weakened and good roundness cannot be obtained. Also, if the interval is less than -0.5% If it is too small, the side guide will get caught in the pipe and cause operational trouble. be.

0010 In this design, the presser roll in the vacuum water tank and cooling water tank can be used to adjust the radius of the pipe. and has a radius of curvature R of +2% to -0.5%, and is not +2% relative to the outside diameter of the tube. Since we installed rolls with parallel side guides with a spacing of -0.5%, water The deformation of the top surface of the tube in the tank is due to the radius of curvature R of the presser roll, and the deformation on both sides is Polybutene wood with high roundness is suppressed by being restrained by the side guide part A fatty duct can be produced.

[0011]

【Example】

Example 1 The details of this invention are explained below based on Figures 1(a) and 1(b) showing an example of its implementation. I will explain. Figure 1 shows the vacuum water tank and the manufacturing equipment for polybutene resin pipes of this invention. This shows the presser roll installed in the cooling water tank, (a) is a front view, (b) is a front view. FIG. In Figure 1, 1 is a polybutene resin pipe, 2 is installed in a vacuum water tank and a cooling water tank. It is a presser foot roll. The presser roll 2 is It has a radius of curvature R of +2% to -0.5%, and the outer diameter of the polybutene resin pipe 1 It has parallel side guide portions 3 with an interval of +2% to -0.5% of the distance.

0012 Therefore, the polybutene resin pipe 1 extruded through the pipe die by the extruder While passing through the vacuum water tank and cooling water tank to be cooled, the upper surface of the presser roll 2 A radius of curvature R of +2% to -0.5% with respect to the radius of the tube also allows both The side guide portions 3 are parallel to each other at intervals of +2% to -0.5% of the outer diameter of the tube. He is restrained and led away. For this reason, the deformation of the pipe in the vacuum water tank and cooling water tank is This makes it possible to manufacture a polybutene resin pipe 1 with high roundness.

[0013] Example 2 In the production of polybutene resin pipes with an outer diameter of 60 mm and a wall thickness of 5 mm, the conventional In the case of Comparative Example 1 in which only the V-shaped roll shown is a presser roll, the V-shaped roll and side roller are In the case of Comparative Example 2 in which the presser roll of this invention was used in combination with the presser roll shown in Example 1, Polybutene resin tubes were manufactured for each of the devices used. and obtained The roundness of each polybutene resin tube was measured. The results are shown in Table 1. Note that roundness is measured by measuring the maximum and minimum outside diameters of one cross section of the polybutene resin pipe. It was calculated using the following calculation formula, which is 0% in the case of a perfect circle. Roundness = (maximum outer diameter - minimum outer diameter) ÷ average outer diameter x 100

[0014]

[Table 1]

[0015] As shown in Table 1, when using the presser roll of this invention, the The circularity is improved by 4 to 8 times, and the effect is clear.

[0016]

[Effect of the idea]

As mentioned above, according to this invention, in the production of polybutene resin pipes, pressing After molding, the presser roll in the vacuum water tank and cooling water tank has a curvature half that corresponds to the pipe diameter. By providing a side guide section parallel to the diameter R, the true shape of the polybutene resin pipe is It is possible to significantly improve roundness.

[Brief explanation of drawings]

FIG. 1 shows a presser roll installed in a vacuum water tank and a cooling water tank of a manufacturing facility for polybutene resin pipes according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a side view.

FIG. 2 is a diagram of a manufacturing process for a general polybutene resin pipe.

FIG. 3 is an explanatory diagram of a V-shaped roll installed in a vacuum water tank and a cooling water tank of a conventional manufacturing facility for polybutene resin pipes.

[Explanation of symbols]

1, 18 Polybutene resin pipe 2 Presser foot roll 3 Side guide part 11 Extruder 12 Pipe die 13 Vacuum water tank 14 Cooling water tank 15 Collection machine 16 Cutting machine 17 V-shaped roll

Claims (1)

[Scope of utility model registration request] Claim 1: In a polybutene resin pipe manufacturing apparatus comprising an extruder, a pipe die, a vacuum water tank, a cooling water tank, and a take-off machine, a presser roll in the vacuum water tank and cooling water tank is used in a range of +2% to -0.0% relative to the radius of the pipe. An apparatus for producing polybutene resin pipes, which is equipped with rolls having a radius of curvature R of 5% and parallel side guide portions spaced apart from +2% to -0.5% with respect to the outer diameter of the pipe.