JP3284233B2 - Injection molding machine plasticizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasticizer for an injection molding machine, and more particularly to an improvement in a plasticizer for efficiently changing the color of a material resin containing a colorant.

[0002]

BACKGROUND ART Conventionally, a method of coloring by this type of plasticizing device, pigment For example a colorant, liquid color, masterbatch, liquid such as color resin, solid melts the raw material introduction hopper inlet or screw It was of the input from the middle to the plasticizing unit.

[0003]

Therefore, the colorant adheres to the inner wall surface of the barrel, the valley portion of the screw, the outer diameter surface, and the like. In order to change the color, the plasticizer had to be disassembled and cleaned, which was very troublesome.

[0004] In marble molding, the marble pattern is determined by the mixing ratio of the raw material and the colorant supplied to the plasticizer, and the marble pattern during the injection process cannot be controlled.

An object of the present invention takes time color change as described above, incomplete thereon, completely dismantled plasticizing device for color change, drawback of needing to be cleaned, further marble molded It is an object of the present invention to provide a plasticizing apparatus for an injection molding machine, which eliminates the disadvantage that the marble pattern cannot be controlled.

[0006]

SUMMARY OF THE INVENTION The present invention for achieving the objects described above, the plasticizing unit of an in-line screw type injection molding machine, rotatably and barrel inserting the movable screw in a predetermined section axis direction Attaching a mixing nozzle with a mixing element at the tip,
Open a passage through which the colorant passes through the shaft inside the screw.
To prevent backflow from the barrel side at the end of this passage
A plasticizing device for an injection molding machine, characterized in that a check valve is provided .

[0007] Further, a screw inserted rotatably into the inner diameter surface of the barrel and a pre-plasticizing device for plasticizing the plastic material by a heating device provided on the outer peripheral surface of the barrel, a torpedo attached to the tip of the pre-plasticizing device and the torpedo A mixing nozzle having the mixing element previously attached, and a switching valve mounted between the pre-plasticizing device and the torpedo via a switching valve, for introducing and measuring the molten resin from the pre-plasticizing device and adding a colorant. In a plasticizing device of an injection molding machine having an injection device for injecting a metering resin through the mixing nozzle by an injection plunger inserted and retracted into an injection barrel, the injection plunger has a central axis from the barrel side. A check valve to prevent backflow is provided.A passage for colorant is provided.A passage is opened at the tip of the injection plunger. Was plasticized device for an injection molding machine, characterized in that the.

The passage through which the colorant passes may be provided at the center axis of the torpedo provided in front of the mixing nozzle, instead of being provided at the injection plunger, or may be provided at the tip of the injection device.

Since the supply amount and time of the colorant as described above can be freely adjusted and controlled, and can be supplied into the measured resin from the center of the screw or the injection plunger, the colorant can be supplied to the barrel inner surface or the screw. And the marble pattern can be freely controlled even in marble molding.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A switching valve is provided upstream of a torpedo of an in-line screw type injection molding machine or a torpedo of a pre-plasticizer which has a torpedo at the tip and a mixing nozzle having a mixing element attached to the tip thereof. Introduce the molten resin from the pre-plasticizer installed
In a plasticizing apparatus of an injection molding machine having an injection device for measuring and adding a colorant and injecting a measurement resin through the mixing nozzle by an injection plunger, a screw, an injection plunger, a torpedo or an injection barrel center is provided. Thus, the supply amount and time of the colorant can be freely adjusted and controlled.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 taking a plasticizing device of an in-line screw type injection molding machine as an example. A plasticizing device 10 is provided with a mixing nozzle 12 provided with a mixing element 11 at the tip. Attached barrel 1
A screw 14 is rotatably and movably inserted in the axial direction by a predetermined distance in the inner diameter portion of the screw 3. It is heated by a heating device provided on the outer peripheral surface of the barrel 13, melted, conveyed to the front of the screw 14 (to the left in the figure), and weighed by a predetermined amount.

[0012] The screw 14 in the interior of the axial center is provided with a passage 15 for passing the colorant, be open to the distal end of the screw 14, the molten resin metered ahead of the screw 14 as described above Colorant. This passage 15 is provided with a check valve 16 so that there is no backflow of the molten resin from the barrel side .

Since the configuration is as described above. The molten resin measured in front of the screw 14 to which the colorant has been supplied is moved forward (moves to the left in the drawing) from the retreat limit of the screw 14, and the mold cavity (not shown) is passed through the mixing nozzle 12. It is injected inside. When the metering resin passes through the mixing nozzle 12, it is mixed by the mixing element 11, and the coloring agent is dispersed to form a colored molded product or a molded product having a marble pattern.

Next, another embodiment of the present invention will be described.
0 are reserved plasticizing apparatus, not on the inner diameter surface of the barrel 21 are shown by the heating from the heating device provided on the outer peripheral surface of rotation and the barrel 21 of the screw 22 is inserted rotatably, screw 22 feed The raw material resin from the supply port is melted and kneaded. At the tip of the barrel 21 is a torpedo 23 and a mixing element 2 attached thereto.
Yes and mixing nozzle 25 is mounted with four, between the torpedo 23 and the spare plasticizing unit 20 is mounted an injection device 27 through the switching valve 26.

In the injection device 27, an injection plunger 30 fixed to a rod of a piston 29 of an injection cylinder 28 is inserted into an inner diameter surface of an injection barrel 31 so as to be axially movable by a predetermined distance, and a switching valve 26 is illustrated. When the pre-plasticizing device 20 and the injection device 27 communicate with each other, the pre-plasticizing
The molten resin is introduced into the injection barrel 31 from the gasifier 20, and the injection plunger 30 provided with the check valve 32 or the passage 34 or the passage opened at the axis of the tip of the injection barrel 31 provided with the check valve 33. Colorant is supplied from 35,
When the predetermined amount of resin is accumulated, the switching valve 26 connects the injection device 27 and the mixing nozzle 25, and
The injection plunger 30 advances (moves downward in the drawing) because the space between the injection device 20 and the injection device 27 is closed, and the molten resin accumulated in the injection barrel 31 is shown through the mixing nozzle 25. The mold is injected into the mold cavity.

At the time of this injection, the colorant is supplied to the vicinity of the center of the molten resin accumulated in the injection barrel 31, but when passing through the mixing nozzle 25, it is mixed by the mixing element 24 to disperse the colorant. It becomes a colored molded product or a molded product with a marble pattern.

In the above-described embodiment, the passage 34 or the passage 35 through which the colorant passes is formed by the injection plunger 30 or the injection barrel 3 respectively.
Although the example in which the opening is formed at the axial center of the front end of the mixing nozzle 25 is not limited to this, the passage 36 and the check valve 37 may be
May be opened at the axis of the torpedo 23 upstream of the torpedo.

[0019]

As described above, the construction and operation described above are performed, and the colorant is supplied to the vicinity of the center of the measured molten resin. There is no contact with the surface, etc., so the colorant does not adhere to the barrel or screw, dismantling the plasticizer,
The color can be easily and completely changed without cleaning, and the disadvantage that the marble pattern cannot be controlled in marble molding can be eliminated.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment in which the present invention is used for a plasticizing device of an in-line screw injection molding machine.

FIG. 2 is an explanatory view of another embodiment of the present invention, showing a plasticizing device of a plunger type injection molding machine.

[Explanation of symbols]

 10, 20 Plasticizing device 11, 24 Mixing element 12, 25 Mixing nozzle 13 21 Barrel 14, 22 Screw 15, 34, 35, 36 Passage 16, 32, 33, 37 Check valve 23 Torpedo 26 Switching valve 27 Injection device 28 Injection cylinder 29 Piston 30 Injection plunger 31 Injection barrel

Claims (4)

(57) [Claims] 1. A plasticizing device for an in-line screw type injection molding machine, wherein a mixing nozzle having a mixing element is attached to a tip of a barrel into which a screw rotatably and axially movable in a predetermined section is inserted, and a mixing nozzle is provided inside the screw. The passage through which the colorant passes through the axis of
And backflow from the barrel side to the tip of this passage
A plasticizing device for an injection molding machine, comprising a check valve for blocking . 2. A pre-plasticizing device for plasticizing a resin material by a screw rotatably inserted into an inner peripheral surface of a barrel and a heating device provided on an outer peripheral surface of the barrel, and a torpedo attached to a tip of the pre-plasticizing device. A mixing nozzle having a mixing element attached at the tip thereof, and a switching valve installed between the pre-plasticizing device and the torpedo via a switching valve, introducing and measuring the molten resin from the pre-plasticizing device, and adding a colorant. A plasticizer of an injection molding machine having an injection device for injecting a measuring resin through the mixing nozzle by an injection plunger inserted into the injection barrel so as to be able to advance and retreat. Provided a passage through which the colorant passes, provided with a check valve that prevents backflow from the nozzle, and opened the passage at the tip of the injection plunger. A plasticizer for an injection molding machine. 3. The plasticizing apparatus for an injection molding machine according to claim 2, wherein the passage through which the colorant passes is provided in the center axis of the torpedo in front of the mixing nozzle, instead of the injection plunger. 4. The plasticizer of an injection molding machine according to claim 2, wherein the passage through which the colorant passes is attached to a tip of an injection device.