JPS61206617A - Injection molder - Google Patents

Abstract

PURPOSE:To eliminate the variation in the supply of resin material into a cylinder and consequently prevent the ununiform supply of melt resin from occurring by a structure wherein a guide groove, which communicates with a resin material supply port, is provided in a cylinder so as to store resin material in the cylinder. CONSTITUTION:A resin material supply port 6, which is bored on the bracket 3 of a cylinder 1 and communicated with the lower end of a hopper 4, is communicated with a guide groove 7 bored on the cylinder 1. The rear end 7b of the guide groove 7, the front end 7a of which coincides with the front end of the supply port 6, is extended to the position nearly same as the position of the riser part 2a of a screw 2 in the retreated state. Accordingly, the resin material 5 (not shown) in the hopper 4 falls by gravity from the supply port 6 in the guide 7 when the screw 2 retreats and fills the riser part 2a of the stem of the screw 2 when the screw 2 advances. Consequently, when the screw 2 advances, the resin materials 5 in the riser part 2a is fed out, resulting in eliminating the condensation and rarefaction of the resin material 5 (not shown) and accordingly the resin is supplied uniformly.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an injection molding machine, and particularly to a screw-in-line type injection molding machine in which a screw is used to cross-melt a thermoplastic bamboo resin material and supply it to a mold. Regarding.

[Technical costs of inventions and their problems]

In a screw-in-line injection molding machine, a thermoplastic resin material is conveyed by a screw, heated and melted while being supplied to a mold C, and as shown schematically in FIG. 3, a screw 2 is inserted into a heating cylinder 1. A small flange 4 is removed from the bracket 1-3 fitted to the base of this cylinder 10, and this i1
＼ Heatable from brim 4! ! ¥1+11 The resin material 15 is supplied to the cut portion 2a at the base of the screw 2 through the resin material 11 supply hole 6 opened in the bracket 1-3 at the lower end of the hopper 1, and as the screw 2 rotates, the resin Slurry monthly interest rate of 5. While being conveyed toward the tip of the nia 2, it is kneaded, melted, and supplied to the mold.

In the case of an injection molding machine with such a configuration, the monthly resin profit is 5
Two types of feeding are carried out during one recycle of molding. That is, during the injection stroke, a starvation supply due to natural fall from the hopper 4 as the screw 2 advances, and a high-density supply due to forced winding into the 4f screw 2 during the next rotation of the screw 2 are repeated. .

As a result, within the cylinder 1 (as shown in Fig. 4), the sparse slaughter 4T state alternately exists, and this is only in the area of the feed zone of the screen 12.
The resin material N5 extends to the metering zone C1 and the metering zone M, and even when the resin material N5 is melted 81 (1), the dense and dense states of J: Sea Urchin Null 1 and the resin shown in Fig. 6 exist at the same time. Become.

Therefore, the supply of resin from the tip measured by the metering zone M of the screw 2 fluctuates, resulting in unstable molding and abnormal internal pressure inside the cylinder 1.
Furthermore, it does not cause problems such as galling or abnormal wear.

[Purpose of the invention]

In view of this, the present invention has been made for the purpose of eliminating the drawbacks of the above-mentioned prior art. An object of the present invention is to provide an injection molding machine that prevents this from occurring.

[Summary of the invention]

In order to achieve the above object, the present invention provides an 11-person seat () in the cylinder that communicates with the resin supply hole and extends in the direction of the base cut of the C screw. 9゜ [Embodiments of the Invention] Hereinafter, embodiments of the present invention are shown in FIGS. 1 and 2. Therefore, the same reference numerals will be used to explain the same parts as in FIGS. 3 to 6.

FIG. 1 shows a cross section of a main part of an embodiment of the present invention, and FIG. 2 shows a cross section with the screw retracted and (61 fat'+A 15) being supplied.

In the illustrated embodiment, the hopper is supported by a bracket 3 fitted on the outer periphery of the base of the cylinder 1, and the resin monthly supply hole 6, which is bored in the brackets 1 to 3 and communicates with the lower end of the hopper 4, is connected to the cylinder 1. The guide d157 is connected to the guide d157. The front end 7) of this guide if/i 7 is aligned with the front of the supply hole 6*; C is extended to the same extent as IF'i.

Therefore, when the screw 2 is retreating, the resin 5 in the hopper 4 falls freely and enters the guide groove 7 from the supply hole 6, and as the screw 2 moves forward, the resin 5 enters the guide groove 7 at the base of the screw 2 as shown in FIG. ” - The bulge 2a is filled with water. After that, when the screw 2 moves forward, the base cut-up portion 2a of the screw 2
Since the resin ttA diagonal 5 contained in the side is fed out, the resin material P1.5 is no longer densely packed, and the same resin material supply hole density as in the case of scale can be maintained.

〔Effect of the invention〕

As explained above, in the present invention, a screw is inserted into a heating cylinder, and the thermoplastic resin supplied into the cylinder is kneaded and melted while being fed by the screw.
In a screw-in-line type injection molding machine, the cylinder is provided with a guide groove that communicates with the resin material supply hole opened in the cylinder and extends in the direction of the cut-up portion of the base of the screw, so that the resin material is supplied to the cylinder in preparation for the next injection operation. By storing the resin in the cylinder, there is no difference in density of the resin over the entire area of the screw, the resin is uniformly supplied, and the quality of the molded product can be stabilized.

It also has the effect of shortening the plasticizing time and stabilizing the camellia density of repetition.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of an embodiment of the present invention, Fig. 2 is a sectional view showing the state of the same resin during monthly supply, and Fig. 3 is an outline of a screw-in-line injection molding machine. A cross-sectional view showing,
FIGS. 4 to 6 are explanatory diagrams showing the state of densification of resin according to the prior art. 1... Heating cylinder, 2... Screw, 2a...
Rounding up part, 3...Bracket, 4...Hopper, 5.
... Resin monthly supply hole, 6... Resin monthly supply hole, 7... Guidance groove.

Claims (1)

[Claims] In a screw-in-line injection molding machine, a screw is inserted into a heating cylinder C, and a thermoplastic resin material supplied into the cylinder is kneaded and melted while being fed by the screw, and then supplied to a mold. An injection molding machine characterized in that a guide groove is provided that communicates with the open resin material supply hole and extends in the direction of the cut-up portion of the base of the screw, so that the resin material is stored in the cylinder in preparation for the next injection operation of the screw.