JP2003340873A - Adapter for discharging resin and method for discharging resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove a residue in a resin molding mold without generating a large amount of waste. <P>SOLUTION: An adapter, which is enclosed in a sandwiched condition between a nozzle 30 of a molding machine supplying a molten resin to the mold 20 and a nozzle receiving part 21a provided on the mold 20 and connected with the nozzle 30 of the molding machine and is used when a residual resin in the mold 20 is discharged, is constructed of a channel 11 which is communicated with a resin passage 22 provided on the nozzle receiving part 21a and a connection port 11a which connects an external fluid supply system with the channel 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin discharging adapter for a resin molding die and a resin discharging method.

[0002]

2. Description of the Related Art In an injection molding machine, when molding materials of different colors using a single device (color change) or cleaning of a thermally deteriorated resin (burnt foreign matter), the inside of a mold is cleaned. The need arises. For example, in the case of color change, if the former material is supplied subsequently to the latter material and the molding is repeated, the former material is eventually removed from the mold, but this method wastes the material and increases the cost. Not only that, there is a problem that a large amount of waste is generated.

[0003]

Therefore, conventionally, a cleaning resin for cleaning a mold has been used. The cleaning resin is, for example, in the form of pellets similar to the molding material, and by being supplied to the injection molding machine in the same manner as the molding material, it is possible to remove foreign substances and materials remaining in the mold. By cleaning (cleaning) using a resin or the like, the amount of waste can be significantly reduced as compared with the method of repeatedly molding using a normal material. However, since such a cleaning resin itself is also a waste, while reducing the amount of the cleaning resin used as much as possible,
It is required to remove the residue in the mold.

The present invention has been made in view of the above problems, and an object thereof is to remove the residue in the resin molding die without producing a large amount of waste.

[0005]

In order to solve the above problems, a resin discharge adapter according to the invention of claim 1 is a molding machine nozzle for supplying a molten resin to a mold, and a molding machine provided in the mold. An adapter that is interposed between a nozzle receiving portion to which a nozzle is connected and is used when discharging the residual resin in the mold, and communicates with a resin passage provided in the nozzle receiving portion. It is characterized by having a flow path and a connection port for connecting an external fluid supply system to this flow path.

According to the present invention, since the fluid can be easily supplied to the resin passage provided in the nozzle receiving portion, a large amount of waste such as cleaning resin is not generated and the residue in the resin passage is removed. It can be easily removed. Also,
Since the resin discharge adapter is sandwiched between the molding machine nozzle and the nozzle receiving portion, the flow passage is surely communicated with the resin passage, and efficient and reliable fluid supply is possible.

A resin discharging adapter according to a second aspect of the present invention is characterized in that, in the resin discharging adapter according to the first aspect, it has fixing means for fixing to the molding machine nozzle.

According to the present invention, since the resin discharge adapter can be attached to the mold heated to a high temperature without bringing the hand close to the mold, the residue in the resin passage can be safely removed.

In the resin discharging method according to the third aspect of the present invention, the adapter is interposed between the molding machine nozzle for supplying the molten resin to the mold and the nozzle receiving portion provided in the mold and connected to the molding machine nozzle. Then, back pressure is applied to this adapter from the molding machine nozzle, and external fluid is supplied from the connection port on the side of the adapter into the flow path inside the adapter, and inside the mold resin passage connected to the flow path. It is characterized in that the residual resin of is discharged.

According to the present invention, the fluid is supplied to the resin passage provided in the nozzle receiving portion of the mold through the resin discharge adapter, so that the cleaning resin is not used in a large amount. The residue in the resin passage can be easily removed. Further, since the resin discharge adapter is pressed against the nozzle receiving portion by the back pressure of the molding machine nozzle, the flow passage can be surely communicated with the resin passage, and the fluid can be supplied efficiently and surely.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a resin discharging adapter according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a state where a resin discharge adapter 10 according to an embodiment of the present invention is sandwiched between a mold 20 and a molding machine nozzle 30 in an injection molding machine.
In the mold 20, the mold body 20A is fixed to the fixed side plate 20B, and the opening 2 formed in the fixed side plate 20B.
3, the nozzle receiving portion 21a of the sprue bushing 21 provided on the mold body 20A is exposed.

The nozzle receiving portion 21a is a molding machine nozzle 30.
Is formed in a concave shape having a larger radius of curvature than the tip end portion 30a, and the tip end portion 30a is abutted without a gap. A resin passage 22 is formed in the sprue bush 21, and the molten resin supplied from the molding machine nozzle 30 connected to the nozzle receiving portion 21 a passes through the resin passage 22 and the mold body 20 A.
Is filled into the inner cavity.

The resin discharge adapter 10 has a tip portion 10a formed in the same manner as the tip portion 30a of the molding machine nozzle 30, and is formed in a substantially tubular shape having a flow passage 11 opening to the tip portion 10a. There is. Further, a connection port 11 a communicating with the flow path 11 is formed on the side portion of the resin discharging adapter 10. The connection port 11a is provided with a check valve (not shown) that blocks a reverse flow in the direction of the arrow in the figure. On the rear end side of the resin discharge adapter 10, there is formed an insertion port 10b into which the front end portion 30a of the molding machine nozzle 30 is inserted.
2 is fixed. The top 12 has a molding machine nozzle 30.
A concave portion 12a with which the front end portion 30a of the above is abutted is formed. A set screw (fixing means) 13 is attached to the insertion port 10b.
Is provided so as to project inward from the side. The set screw 13 allows the resin discharge adapter 10 to be fixed to the molding machine nozzle 30 inserted into the insertion port 10b.

By interposing the resin discharging adapter 10 between the nozzle receiving portion 21a and the molding machine nozzle 30 in a sandwiched state, a connection port 11a communicating with the resin passage 22 through the flow passage 11 is provided. . This connection port 11a
An external fluid supply system is connected to and the fluid such as compressed air of about 5 kg / cm 2 is supplied to the resin passage 22, so that the residual resin can be extruded and removed from the resin passage 22.

Next, an embodiment of the resin discharging method according to the present invention will be described. First, the molding machine nozzle 30
The molten resin is brought into contact with the nozzle receiving portion 21a and the molten resin can be supplied to the mold 20, and is retracted to the right in the drawing. Then, the resin discharge adapter 10 is attached to the tip portion 3 of the molding machine nozzle 30.
0a into the insertion opening 10b to attach it, and set screw 1
3 is tightened and fixed to the molding machine nozzle 30. It is sufficient that the set screw 13 can be fixed so that the resin discharge adapter 10 does not come off when the molding machine nozzle 30 moves back and forth. An external fluid supply system is connected to the connection port 11a of the resin discharge adapter 10.

When the resin discharge adapter 10 is attached to the tip portion 30a of the molding machine nozzle 30 when advancing and retracting, the molding machine nozzle 30 is advanced to the left in the drawing. Then, the tip portion 10a of the resin discharging adapter 10 is brought into contact with the nozzle receiving portion 21a to apply back pressure from the molding machine nozzle 30, and the resin discharging adapter 10 is placed between the nozzle receiving portion 21a and the molding machine nozzle 30. Make it pinch. The back pressure of 30 at this time is, for example, 4 to 5 tons, which is the same as in the normal injection molding.

Then, the dividing surface of the mold 20 is opened,
An external fluid such as air is supplied into the flow passage 11 in the resin discharging adapter 10 from the external fluid supply system connected to the connection port 11a on the side of the resin discharging adapter 10. Thereby, the residual resin in the resin passage 22 on the mold 20 side connected to the flow path 11 can be pushed out and discharged. It is desirable that the temperature of the mold 20 is not lowered so much that the molten resin can flow until the remaining resin is completely discharged. Even if the resin solidifies in the resin passage 22 and the fluid flows backward without being supplied to the resin passage 22, the resin discharge adapter 10 is sandwiched between the sprue bushing 21 and the molding machine nozzle 30 so that it does not come off. Hard and safe.

Thus, the resin discharging adapter 10 fixed between the nozzle receiving portion 21a and the molding machine nozzle 30.
By supplying the external fluid by using, it is possible to remove the resin and foreign matter remaining in the resin passage 22 of the mold 20. Further, the resin discharge adapter 10 is attached to the molding machine nozzle 3
Since it can be fixed to 0, there is no risk of touching the mold 20 heated to a high temperature, and the resin discharge adapter 10 can be safely used.
Can be attached and detached.

[0019]

As described above, according to the resin discharging adapter of the first aspect of the present invention, since the fluid can be easily supplied to the resin passage provided in the nozzle receiving portion, it can be used as a cleaning resin. The residue in the resin passage can be easily removed without producing a large amount of waste. Therefore, since it is not necessary to use a large amount of the molding resin material or the cleaning resin for the material change, the color change, and the cleaning, and to discard the resin, the cost can be reduced.

According to the resin discharge adapter of the second aspect of the present invention, the resin discharge adapter can be attached without bringing the hand near the mold heated to a high temperature. Can be removed, and the workability of cleaning the mold can be improved.

According to the resin discharging method of the third aspect of the present invention, the residue in the resin passage of the mold can be easily removed without using a large amount of the molding resin material and the cleaning resin and discarding them. Therefore, cost reduction can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a resin discharging adapter according to an embodiment of the present invention.

[Explanation of symbols]

10 Resin discharge adapter 11 flow paths 11a connection port 13 Set screw (fixing means) 21a Nozzle receiving part 22 Resin passage 30 molding machine nozzle

Claims (3)

[Claims] 1. A molding machine nozzle for supplying a molten resin to a mold and a nozzle receiving portion provided in the mold and connected to the molding machine nozzle, sandwiched between the molding machine nozzle and the molding machine nozzle. An adapter used when discharging residual resin, having a flow path communicating with a resin path provided in the nozzle receiving portion, and a connection port for connecting an external fluid supply system to the flow path. A resin discharge adapter characterized in that 2. The resin discharging adapter according to claim 1, further comprising fixing means for fixing to the molding machine nozzle. 3. An adapter is interposed between a molding machine nozzle that supplies a molten resin to a mold and a nozzle receiving portion that is provided in the mold and is connected to the molding machine nozzle, and the adapter is provided with respect to the adapter. Back pressure is applied from the molding machine nozzle, and an external fluid is supplied from the connection port of the adapter side portion into the flow passage in the adapter to remove the residual resin in the mold resin passage connected to the flow passage. A resin discharging method characterized by discharging.