JPS6036350Y2 - Coloring pigment injection nozzle for plastics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coloring pigment injection nozzle for plastics, and more particularly to a coloring pigment injection nozzle for plastics suitable for uniformly coloring.

Conventionally, pigment injection nozzles used for coloring plastic molded products include a metal tube 1 with the tip narrowed as shown in FIG.
It is generally known that the tip of a metal tube 1 is crushed, and as shown in FIG. 3, a net 2 is attached to the tip of the metal tube 1.

However, with this type of nozzle, there are problems such as variations in the amount of pigment ejected, resulting in colored spots, or clogging, which prevents the pigment from being ejected, resulting in defective products and wasted pigment. However, there are drawbacks such as high cost.

The present invention was devised to solve these conventional difficulties, and its purpose is to provide a coloring pigment injection nozzle for plastics that can spray pigment uniformly to ensure stable quality. It is in.

In this invention, multiple slits cut in the axial direction from the nozzle tip are provided on the nozzle circumferential surface at intervals in the circumferential direction, and multiple holes are provided on the nozzle circumferential surface and the tip surface, so that some of the holes may become clogged. However, other holes and slits are used to ensure uniform pigment injection.

The present invention will be explained below based on an embodiment shown in FIGS. 4 to 6.

FIG. 4 shows a plastic injection molding machine, and in the figure 11 is a material feeding pipe.

The material sent through this material feeding pipe 11 is supplied to a hopper 12, where it is dried by a built-in hopper dryer 13.

The material from this hopper 12 is colored by a pigment from a coloring device 16 that is injected from a nozzle 15 via a pigment supply pipe 14, and then supplied to an injection molding machine main body 17.

The material sent to the injection molding machine main body 17 is heated and melted here and supplied to a plastic molding die 18, and the molded product is taken out by a product takeout machine 19.

The nozzle 15 is formed into a cylindrical shape with a closed end, as shown in FIGS. 5 and 6, and is fixed to the end of the pigment supply pipe 14 by brazing 20. As shown in FIGS.

A cross-shaped slit 21 with a width of 0.8 to 1.0 m is provided on the circumferential surface of the nozzle 15, cutting in the axial direction from the tip. A large number of holes 22 having a diameter of 0 to 1.2φ are provided.

Even if some of the holes 22 become clogged, the remaining holes 2
2 and slit 21, sufficient uniformity of pigment injection can be ensured.

Next, the effect will be explained.

The pigment measured by the coloring device 16 is forced through the pigment supply pipe 14 by compressed air and is sprayed from the nozzle 15.

Then, it is smoothly and uniformly diffused through the slit 21 and the large number of holes 22.

At this time, even if some of the holes 22 become clogged, the remaining many holes 22 and slits 21 enable uniform injection, and quality stability is maintained.

As explained above, this embodiment provides the following effects.

(1) Even if some of the holes become clogged, the remaining holes and slits allow the pigment to be uniformly injected, making it possible to stabilize the quality.

(2) Since the pigment is sprayed uniformly, the coloring efficiency is high, the pigment can be saved, and the cost can be reduced.

(3) Since the slit and dimensions are small, there is no possibility of plastic materials getting mixed into the nozzle.

In addition, although the case where the cross-shaped slit 21 was provided was explained in the said Example, the shape other than this may be sufficient.

Further, the number of holes 22 is not limited to what is illustrated.

The present invention has been described above based on preferred embodiments, but according to the present invention, it is possible to spray pigment uniformly and to stabilize quality.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, each figure a is a front view, each figure is a left side view, Figure 4 is a schematic diagram showing a plastic injection molding machine, and Figure 5 is a diagram of the present invention. FIG. 6 is a left side view of FIG. 5. 14... Pigment supply pipe, 15... Nozzle, 16... Coloring device, 17...
... Injection molding machine body, 21 ... Slit, 2
2...hole.

Claims (1)

[Scope of utility model registration request] A coloring pigment injection nozzle for plastics, characterized in that a plurality of slits cutting in the axial direction from the nozzle tip are provided on the nozzle surface at intervals in the circumferential direction, and a plurality of holes are provided on the nozzle circumferential surface and the tip surface. .