JPH0732017Y2 - Nozzle breaker plate for color change - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a nozzle of an injection molding machine used for so-called color changing work when changing the type of raw material resin for injection in synthetic resin injection molding or when changing the raw material resin of another color. It is about breaker plates.

[0002]

2. Description of the Related Art In the process of producing a synthetic resin injection molded product of this type, a fine particulate resin material and a coloring pigment are mixed and heated, and the mixture is heated from an injection cylinder into a mold cavity through a nozzle. Is configured to.

At this time, a color dispersion plug is interposed between the injection cylinder head and the nozzle in order to enhance the kneading effect of the resin material and the pigment and to distribute the pigment in the material as uniformly as possible. FIG. 2 is a cross-sectional explanatory view of the main part thereof.

Reference numeral 1 is an injection cylinder head, 2 is a nozzle screwed to the front portion thereof, and a nozzle breaker plate 5 which is a type of a color dispersion plug is interposed therebetween.
As shown in the enlarged plan view of FIG. 3, the nozzle player plate 5 has a plurality of fine linear small holes 6 (arrangement pattern is schematically shown) in the axial direction of a thick disc-shaped member,
The molten resin containing the pigment is passed through a large number of passages to improve the kneading and color dispersion effects.

On the other hand, in this type of product, it is general to prepare a product having a plurality of different colors in order to give the product variety, and after producing a predetermined amount of a product of a certain color, Need to "color change" for other color products.

In such a case, the pigment mixed in the resin material used in the production process of the previous product remains in the details of the internal path from the material injection of the injection molding machine to the injection nozzle, so that the nozzle is changed at each color change. Remove the nozzle, clean the main part, insert the nozzle breaker plate 5 again, start the trial injection with the pigment of the new color, and continue the injection of the intermediate product until the previous color is completely removed before the actual production. Had moved to a new production process.

[0007]

However, in the above color changing work, the trial injection is performed using the regular nozzle breaker plate 5 having the large number of small holes 6 even after the nozzle 2 is cleaned. Therefore, there is a large tendency to generate fine molten resin pools, which results in poor color loss, increases the production quantity of unsold intermediate products, and increases the time required for complete switching.

The present invention has been made in view of the problems at the time of color change as described above, and shortens the time required for this type of color change production switching and saves the wasteful quantity of test injection intermediate products. The purpose is to provide a means of obtaining.

[0009]

Therefore, in the present invention, during this type of color changing work, a regular nozzle breaker plate having a large number of small hole passages is used instead of a single nozzle having a relatively large diameter in the central portion. The aim is to achieve the above object by using a nozzle breaker plate for color change on a disc with holes.

[0010]

[Function] Since the dedicated color change nozzle breaker plate as described above does not have a large number of small hole passages unlike the regular production nozzle breaker plate, a pool of molten resin containing pigment at the time of the previous production process, etc. Since it is difficult to form and color loss is promoted, by using this when cleaning the nozzle at the time of color change, it is possible to reduce the switching time required for color change production and the number of intermediate products.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment. FIG. 1 is a plan view of an example of a nozzle breaker plate 3 dedicated to a color changing work according to the present invention. This nozzle breaker plate 3 is provided with a single hole 4 having a relatively large diameter at the center of a disk member having an outer diameter and a thickness equal to those of the regular nozzle breaker plate 5 (FIGS. 2 and 3). There is.

This dedicated nozzle breaker plate 3 is
The above object can be easily achieved by using the regular nozzle breaker plate 5 instead of the regular nozzle breaker plate 5 until the color of the molded product is completely changed only during the color removing operation.

In the above embodiment, an example of a breaker plate on a circular plate is described, but the principle of the present invention is not limited to this, and is applicable to other types of color dispersion plugs. obtain.

[0014]

As described above, according to the present invention, during the color changing work of this kind of synthetic resin molding, a dedicated color changing nozzle breaker plate is used instead of the nozzle breaker plate at the regular production. By using it, the color loss of the pigment used in the previous production process is promoted, and it is possible to reduce the switching time to shift to the color change production and the waste of the quantity of intermediate products.

[Brief description of drawings]

FIG. 1 is a plan view of an example of a color change nozzle breaker plate according to the present invention.

FIG. 2 is a cross-sectional explanatory view of a main part of a nozzle portion.

FIG. 3 is a plan view of an example of a regular nozzle breaker plate.

[Explanation of symbols]

 1 Injection cylinder head 2 Nozzle 3 Nozzle breaker plate for color change 4 Hole 5 Regular nozzle breaker plate 6 Small hole

Claims (1)

[Scope of utility model registration request] 1. When interposing between an injection cylinder of an injection molding machine and a nozzle in place of a nozzle breaker plate used in regular production during a color changing operation of synthetic resin injection molding,
A nozzle breaker plate for color change, characterized in that a disk-shaped member having the same outer diameter and thickness as the regular nozzle breaker plate is provided with a single hole having a relatively large diameter in the center thereof.