JPH01141705A - Kneading equipment for resin molding materials - Google Patents

Abstract

PURPOSE:To enable the prevention of damage of glass fiber even if a kneading efficiency is improved by providing a hopper apparatus for throwing little by little glass fiber into a kneader by use of the rotating motive power of a blade of the kneader above the kneader for kneading a resin molding material. CONSTITUTION:A hopper apparatus 2 for throwing little by little glass fiber into a kneader 1 is provided above the kneader 1 and the hopper apparatus 2 comprises a hopper 4 containing glass fiber 3 and a shutter mechanism 5 attached on the opening portion of the hopper 4 and for dropping little by little glass fiber 3 into the kneader 1. A rotating disc 5b is belt-driven by a pulley 9 secured to the driving shaft 8 of a blade 7 of the kneader 1 via a speed changer 10, the glass fiber 3 falls in small portions accompanying the rotation of the blade 7 into the kneader 1.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an apparatus for adding and kneading glass fibers into a resin molding material such as a polyester premix.

[Conventional technology]

When kneading resin molding materials such as polyester premix used to mold electrical appliance cases and covers, the resin, fillers, additives, etc. are kneaded, and then glass fiber is added to improve strength. Traditionally, the entire amount of glass fiber was added at once.

[Problems to be solved by the invention]

However, if the glass fibers are added all at once, the kneading efficiency is poor, resulting in significant breakage of the glass fibers and a decrease in impact strength. In this invention, by gradually introducing glass fiber,
It is an object of the present invention to provide a kneading device for a resin molding material that can improve the kneading efficiency of resin and glass fibers, suppress breakage of glass fibers, and improve the impact strength of the resin molding material.

[Means to solve the problem]

In this invention, above the kneader for kneading the resin molding material,
A hopper device is provided for gradually introducing glass fiber into the kneader using the rotational power of the blades of the kneader.

[For use]

According to this invention, the glass fibers are gradually dispersed and introduced into the kneader as the blades of the kneader rotate, so that kneading efficiency is improved and breakage of the glass fibers is suppressed.

【Example】

Hereinafter, the present invention will be explained in detail based on the drawings. FIG. 1 shows an apparatus according to the present invention, in which a hopper device 2 is provided above the kneader 1 to gradually introduce glass fibers into the kneader 1. The hopper device 2 includes a hopper 4 that accommodates glass fibers 3;
It consists of a shutter mechanism 5 which is attached to the opening of the hopper 4 and causes the glass fibers 3 to gradually fall into the kneader 1. As shown in FIG. 2, the shutter mechanism 5 is composed of two shutter plates, a fixed disk 5a and a rotating disk 5b, both of which have a cutout window with a central angle of about 90 degrees. Each time the hopper rotates and the notched windows of the two discs overlap, a window 6 is formed so that the glass fibers in the hopper 4 fall. The rotating disk 5b is connected to the transmission 10 and the rotation converter 1 by a pulley 9 attached to the drive shaft 8 of the blade 7 of the kneader 1.
The glass fibers 3 fall into the kneader 1 little by little as the blades 7 rotate. The amount of glass fiber 3 to be introduced is adjusted as appropriate by changing the rotational speed of the rotating disk 5b using the transmission 10. FIG. 3 shows a comparison of the length distribution of glass fibers in a polyester premix between the apparatus of the present invention and the conventional method. The figure shows an investigation of a material to which 20% by weight of glass fiber having a length of 1/2 inch was added. As is clear from this figure, the apparatus of the present invention causes less breakage of glass fibers. Furthermore, FIG. 4 shows the Charvy impact values of those using the apparatus of the present invention and those using the conventional method in relation to the amount of glass fiber added. From this figure, it can be seen that the impact strength of the polyester premix produced using the apparatus of the present invention is greatly improved compared to that produced by the conventional method when glass fiber is added in an amount of 15 to 25% by weight.

【Effect of the invention】

In this invention, above the kneader for kneading the resin molding material,
A hopper device is installed to gradually introduce the glass fibers into the kneader using the rotational power of the blades of the kneader, and the glass fibers are gradually dispersed and introduced into the kneader, thereby improving kneading efficiency. This reduces breakage of glass fibers,
A resin molding material with high impact value can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of this invention, and FIG.
Figure 3 is a diagram showing the distribution of glass fibers in a polyester premix using the device of the present invention compared to the conventional method; Figure 4 is a plan view of the shutter mechanism in Figure 4; FIG. 2 is a graph showing the Charby impact value of a polyester premix in relation to the amount of glass fiber added, comparing a case using the apparatus of the present invention and a case using a conventional method. 1: Kneader, 2: Hopper device, 3 Ni glass fiber 4: Hopper, 5: Shutter mechanism, 7: Blade. ·ingredient. 2 Claw-78・sha! Figure 1 Figure 2

Claims (1)

[Claims] 1) Kneading of resin molding material, characterized in that a hopper device is provided above the kneader for kneading the resin molding material, for gradually introducing glass fiber into the kneader using the rotational power of the blades of this kneader. Device.