JPH09295334A - Die for profile extrusion molding - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a die structure for heteromorphic extrusion molding, which overcomes the eye blemishes that occur during conventional heteromorphic extrusion molding and is excellent in productivity and workability. By providing a groove portion surrounding a resin outlet of a profile extrusion die around the resin outlet, the following formula 10 ° ≦ θ ≦ 80 ° 0 <d is provided between the outlet and the groove. A die-proof die extrusion mold for preventing perforation, comprising an outer outlet wall having an inclination angle (θ), a top thickness (d) and a height (t) defined by <3 mm t ≧ 1 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a profile extrusion molding die which is excellent in preventing eye bleeding. Further, the present invention prevents a die die which is generated at the time of profile extrusion molding, and can be suitably used for production of a profile extruded product such as an automobile, an OA and a building material which is excellent in productivity and workability. The present invention relates to a molding die.

[0002]

2. Description of the Related Art Eye crevices at the time of profile extrusion molding are generated at the exit of the extrusion die, grow over time and sometimes adhere to the extruded product, and when passing through the sizing die, the eye die is clogged at the entrance of the sizing die. It may interrupt production.

Conventionally, as a countermeasure against eye blemishes, the improvement of the material has been dealt with, and the improvement by the production technique is rarely seen. In addition, there is a limit to the improvement in materials, and in many cases, labor is used to eliminate the problem of eye blemishes.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a die structure for profile extrusion molding, which is capable of overcoming the eye bleeding that occurs during conventional profile extrusion molding and which is excellent in productivity and workability. Is.

[0005]

In view of the above-mentioned situation, the inventors of the present invention have made diligent studies to obtain a die structure with excellent die-preventing property, stable productivity and workability for a die for profile extrusion molding. As a result, it was found that the above problems could be solved by improving the structure near the resin outlet of the profile extrusion die, and the present invention was made.

According to the present invention, a groove portion surrounding the resin outlet of the profile extrusion die is provided around the resin outlet.
A flow having an inclination angle (θ), a top thickness (d) and a height (t) defined by the following formulas: 10 ° ≦ θ ≦ 80 ° 0 <d <3 mm t ≧ 1 mm between the outlet and the groove. A die for preventing die-sinking, which is characterized in that an outer wall of an outlet is formed. Further, the present invention resides in a die-proof die-molding die for preventing perforation, characterized in that the radius of curvature (R) of the edge portion of the die at the resin outlet is R <2 mm.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial front view (a) and a sectional view (b) near a resin outlet of a profile extrusion die. FIG.
In the profile extrusion molding dies shown in (a) and (b), the groove (2) surrounding the resin outlet (1) is provided around the resin outlet (1), so that between the outlet and the groove.
An outlet outer wall (3) is formed.

Therefore, in the present invention, it is necessary that the outer wall (3) of the outlet has at least a shape defined by the following equations. 10 ° ≦ θ ≦ 80 ° 0 <d <3 mm t ≧ 1 mm When the inclination angle (θ) of the outlet outer wall exceeds 80 °, the desired effect of preventing eye brow cannot be obtained, and when it is less than 10 °, Difficult to process, breaks easily in actual use, and when the top thickness (d) is 3 mm or more, or the height (t) is 1 m.
When it is less than m, the desired effect of preventing eye bleeding cannot be obtained, and both are not preferable. Here, the inclination angle (θ) of the outer wall of the outlet is the angle formed by the inner and outer surfaces of the outer wall (3) of the outlet as shown in FIG.
Is the distance between the inner and outer surfaces at the top of the outlet outer wall (3), and the height (t) is the distance between the top of the outlet outer wall (3) and the base, in other words the groove (2). ) Depth, defined as.

Further, in the present invention, the radius of curvature (R) of the edge portion (4) of the die at the resin outlet (1) is further added.
Preferably does not exceed 2 mm. Curvature radius (R)
However, if it is too large, the shape and size of the molded product will vary, and the effect of preventing eye bleeding cannot be obtained. Here, the radius of curvature (R) of the edge portion is, as shown in FIG. 1 (b), between the top surface of the outlet outer wall (3) and the inner surface of the outer wall, in other words, the resin outflow wall. Is defined as the size of the roundness at the edge portion (4).

The material for the profile extrusion die of the present invention is generally readily available, has good machinability, has a beautiful finished surface, has great wear resistance, is free from defects such as pinholes, and can be heat treated. A material that is easy and has little deformation due to heat is applied. As the steel material, rolled steel material for general structure (S
S), carbon steel for machine structure (SC, SCK), carbon tool steel (SK), alloy tool steel (SKS, SKD), high speed steel (SNC), high carbon chrome, bearing steel (SNJ), nickel chrome molybdenum Steel (SNCM), chrome molybdenum steel (SCN), aluminum chrome molybdenum steel (SA
CM), but other materials such as aluminum, duralumin, and ceramics are applied.

As the profile extrusion molding material used in the present invention, a thermoplastic resin is generally used, and examples thereof include aromatic polycarbonate resin, nylon resin, saturated polyester resin, polyarylate resin, polyacetal resin, polysulfone resin, and polyphenylene. Not only engineering plastics exemplified by ether resins and the like, but also general-purpose plastics exemplified by polyolefin resins, polystyrene resins, ABS resins, AS resins, PVC resins, methacrylic resins, fluorine-containing resins and the like can be applied without any restriction.

The above thermoplastic resins may be used as a mixture of two or more kinds. If desired, other resins, various additives such as UV absorbers, stabilizers, pigments, dyes, lubricants, etc., or reinforcing materials such as organic fibrous substances and inorganic fillers can be added.

Hereinafter, the die structure of the present invention will be described more specifically based on examples. The present invention is not limited to these.

Examples 1 to 6 and Comparative Examples 1 to 3 Aromatic polycarbonate resin using bisphenol A as a raw material (Mitsubishi Engineering Plastics Co., Ltd., trade name Iupilon E-2000; molecular weight 28,000)
0.3 part by weight of an ultraviolet absorber (Ciba Geigy Co., Ltd., trade name Tinuvin P) and a heat stabilizer (Asahi Denka Co., Ltd., trade name 2112) per 100 parts by weight. Were mixed in a tumbler and extruded with a uniaxial vented extruder to form pellets. After drying the pellets at 120 ° C. for 5 hours or more in a hot air dryer, continuous die extrusion was carried out at a resin temperature of 260 ° C. for 3 hours using a die having the structure shown in FIG. At that time, the outflow outlet outer wall having various inclination angles (θ), apex thickness (d) and height (t), or a curvature radius (R) of the edge portion was formed, and the occurrence of eye blemishes was measured. Table 1 shows the results.

Examples 7-10 and Comparative Examples 4-6 Glass fiber 30% by weight and thermoplastic elastomer 10% by weight
Nylon 6 resin containing Mitsubishi Engineering Plastics Co., Ltd., trade name NOVAMID 103
5 GTX) was subjected to continuous profile extrusion for 3 hours at a resin temperature of 240 ° C. using the die having the structure shown in FIG. At that time, various inclination angles (θ), top thickness (d)
And the outer wall of the outlet having the height (t) or the radius of curvature (R) of the edge portion was formed, and the occurrence of eye blemishes was measured. The results are shown in Table 2.

<< Examples 11 to 14 and Comparative Examples 7 to 9 >> Polybutylene terephthalate resin (manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name Novadwool 50)
20S) 100 parts by weight of an ultraviolet absorber (Ciba
0.3 parts by weight of TINUVIN P manufactured by Geigy Co., Ltd. was mixed in a tumbler, and the mixture was extruded with a uniaxial vent type extruder to form pellets. After drying the pellets at 120 ° C. for 5 hours or more in a hot-air dryer, continuous die extrusion was performed at a resin temperature of 240 ° C. for 3 hours using the die having the structure shown in FIG. . At that time, an outlet outer wall having various inclination angles (θ), apex thickness (d) and height (t), or a radius of curvature (R) of the edge portion was formed, and the occurrence of eye blemishes was measured. Table 3 shows the results.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

[Table 3]

The generation conditions of the eye crocodile in Tables 1 to 3 are obtained by measuring the growth amount (length) of the eye crocodile generated at the resin outlet and performing a four-level evaluation based on the following criteria. is there. ◎ There is no eye stain. ○ The amount of eye blemishes generated is within 0.5 mm. △ The amount of eye blemishes is within 2 mm. × The amount of eye blemishes is 2 mm or more.

From the test results shown in these tables, however, there is no occurrence of eye blemishes at the outer wall inclination angle (θ) of 80 ° or less than 0.5 mm. That the outer wall height (t) is 2
Up to mm, there are few eye blemishes, and outer wall top thickness (d)
It will be understood that when 3 mm is 3 mm, the occurrence of eye bleeding increases, and when the edge radius of curvature (R) is 2 mm, the occurrence of eye blemishes is remarkable.

[0022]

According to the present invention, by providing a specific groove portion that surrounds the resin outlet of the die, even if a special die material is not used and the type of molding material is used, It is possible to sufficiently prevent the occurrence and improve productivity and workability.

[Brief description of drawings]

FIG. 1 is a partial front view (a) and a sectional view (b) near a resin outlet of a profile extrusion die.

[Explanation of symbols]

 1 Resin Outlet 2 Groove 3 Outlet Outer Wall 4 Edge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukinori Murakami 5-6-2 Higashihachiman, Hiratsuka City, Kanagawa Sanryo Engineering Plastics Co., Ltd. Technical Center

Claims (2)

[Claims] 1. A resin extrusion outlet of a profile extrusion die is provided with a groove surrounding the resin outlet so that the following equation 10 ° ≦ θ ≦ 80 ° 0 <is provided between the outlet and the groove. A die for die-sinking preventive profile extrusion molding, characterized in that an outlet outer wall having an inclination angle (θ), a top thickness (d) and a height (t) defined by d <3 mm t ≧ 1 mm is formed. 2. The die-proof die-molding extrusion die according to claim 1, wherein the radius of curvature (R) of the edge portion of the die at the resin outlet is R <2 mm.