JP2002200617A - Subtank for resin dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subtank for a resin dryer capable of preventing foreign matter in the atmosphere from getting mixed in a molded article at the time of charging of a resin. SOLUTION: In the subtank 3 for the resin dryer for housing and drying a resin for molding a resin product, a pipe 5 having an end shape capable of tearing a part of a resin bag 14 housing the resin to enter the bag and sending the resin into the subtank 3 from the resin bag 14 is provided in a projected state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a synthetic resin product in a transparent molded article such as a lens or a prism.
The present invention relates to a sub-tank of a resin dryer capable of preventing foreign substances such as dust existing in the environment from being mixed.

[0002]

2. Description of the Related Art Conventionally, in a screw-type plasticizer, a resin dryer having a loader for automatically supplying dried resin has been generally used.

For example, connection of a dryer as disclosed on page 2 of the Kato Riki catalog is generally known.

[0004] The resin dryer has a 2
One of the two pipes is connected to the molding machine, and the other is connected to the resin sub-tank. After the resin drier sucks up the resin in the sub-tank and dries inside, the remaining amount of resin inside the molding machine is small. It automatically supplies resin in response to a signal from a sensor that informs the user of the change (for example, on page 2 of the Kato Riki catalog).

[0005]

However, in the case of the conventional sub-tank having the above-described structure, when the lid of the sub-tank is opened and the resin is charged, the sub-tank floats in the air due to a large amount of static electricity carried by the resin. Greetings and foreign matter adhering around the sub-tank inlet are involved, so the cleanliness of the entire molding environment must be improved. And labor is required.

In addition, since it is difficult to increase the cleanliness of the entire molding environment, there is a method of increasing the cleanliness of the space only by providing a resin charging place separately.
Since it is difficult to cut the sub-tank attached to the dryer and it is necessary to move the sub-tank to the space, a large amount of labor is required in a factory having dozens of molding machines.

The present invention has been made in view of the above circumstances, and provides a sub-tank of a resin dryer capable of preventing foreign substances in the atmosphere from being mixed into a molded product when the resin is charged. .

[0008]

According to the first aspect of the present invention,
In a sub-tank of a resin dryer that stores and dries resin for molding resin products, the sub-tank has an end shape that allows a part of the resin bag containing the resin to be broken and immersed inside. Characterized in that a resin supply pipe for feeding the resin is protruded.

According to the present invention, a resin supply pipe having a diameter sufficiently smaller than, for example, the sub-tank is provided in the sub-tank of the resin dryer, and a part of the resin bag is broken by the end of the resin supply pipe. By connecting directly and feeding resin,
Foreign matter in the atmosphere can be prevented from entering the sub-tank, and the occurrence of defective resin products due to the foreign matter can be prevented.

According to a second aspect of the present invention, there is provided a sub-tank of a resin dryer for storing and drying a resin for molding a resin product, wherein a part of the resin bag storing the resin is broken and the end portion is immersed therein. A resin supply pipe having a shape and feeding resin from the resin bag to the inside of the sub-tank, and a clean gas supply means for discharging a clean gas toward the outside of the resin supply pipe through the inside of the sub-tank are provided. Things.

According to this invention, it is possible to prevent foreign substances in the atmosphere from entering the sub-tank, and to prevent the occurrence of defective resin products due to foreign substances based on the same operation as the first aspect of the present invention. It becomes possible. Further, the clean gas is supplied to the outside of the resin supply pipe via the inside of the sub-tank by the clean gas supply means, so that even when the end of the resin supply pipe is open, foreign matter in the atmosphere can be introduced into the sub-tank. Can be prevented, so that the occurrence of defective resin products due to foreign matter can be more reliably prevented.

According to a third aspect of the present invention, in a sub-tank of a resin dryer for storing and drying a resin for molding a resin product, an end shape in which a part of a resin bag storing the resin is connected in an opened state. A resin supply pipe for feeding the resin from the resin bag into the sub-tank, a resin feeding aid attached to an end of the resin supply pipe so as to surround a part of the opened resin bag, and And a clean gas supply means for causing the clean gas to flow toward the outside of the resin supply pipe via the above.

According to the present invention, there is provided a resin supply pipe to which a part of the resin bag containing the resin is connected in an opened state, and the end of the resin supply pipe so as to surround a part of the opened resin bag. Also equipped with a resin injection aid attached to the section, it is possible to reliably prevent foreign substances in the air from entering the sub tank from the end of the resin supply pipe and prevent the occurrence of defective resin products due to foreign substances It is possible to do. Furthermore,
Similarly to the second aspect of the present invention, the clean gas is supplied to the outside of the resin supply pipe through the sub-tank by the clean gas supply means, so that even when the end of the resin supply pipe is open, the air is released. Since foreign matter in the inside can be prevented from being mixed into the sub tank, generation of defective resin products due to foreign matter can be more reliably prevented.

[0014]

Embodiments of the present invention will be described below in detail.

(First Embodiment) (Configuration) A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1 is an injection molding machine, 2 is a resin dryer, and 3 is a sub-tank connected to the resin dryer 2 by piping.

A pipe 5 is attached to the lid 4 of the sub-tank 3, which is a resin supply pipe which has an acute end and communicates with the inside of the lid. The pipe 5 has an intermediate portion for preventing resin leakage. It has a plate-shaped stopper 6.

Further, regarding the projecting opening of the pipe 5,
The plug 7 is closed except when the resin is charged.

The lower part of the sub-tank 3 and the resin dryer 2 are connected by a primary transport pipe 8 for transporting the resin, and a hopper 9 attached to the upper part of the cylinder of the resin dryer 2 and the injection molding machine 1. And are connected by the secondary transport pipe 10. Further, a suction pipe 11 is attached between the upper part of the hopper 9 and the resin dryer 2.

A filter 13 is attached to a protruding end of a pipe 12 extending from the side wall of the sub-tank 3 to the inside thereof. In FIGS. 1 and 2, reference numeral 14 denotes a resin bag containing a resin.

(Operation) Next, the operation of the first embodiment will be described mainly with reference to FIG.

When charging the resin into the sub-tank 3, first, the plug 7 of the pipe 5 is removed. Then, a part (for example, the bottom) of the resin bag 14 is pierced into the projecting opening of the pipe 5 and is pressed directly onto the stopper 6. Thereby, a part of the resin bag 14 is broken, and the resin in the resin bag 14 is charged into the sub tank 3 via the pipe 5.

When all the resin has been charged into the sub-tank 3, the resin bag 14 is removed, and the plug 7 is fitted to the tip of the pipe 5.

When the remaining amount of resin in the resin dryer 2 decreases, a sensor (not shown) for detecting the remaining amount, which is installed in the resin dryer 2 in advance, operates, and the loader is automatically loaded based on the sensor signal. Is operated, and the resin in the sub tank 3 is sucked into the resin dryer 2 via the primary transport pipe 8.

By the suction force at this time, the outside air is sucked into the sub tank 3 through the pipe 12 while being purified by the filter 13.

When the remaining amount of resin in the hopper 9 mounted on the upper part of the injection molding machine 1 becomes small, a sensor installed in the hopper 9 for detecting the remaining amount (not shown) operates, and a signal from the sensor is activated. , The loader is automatically operated, and the resin in the resin dryer 2 is suction-transported to the hopper 9.

(Effect) According to the first embodiment described above, when the resin is charged into the sub-tank 3, the protrusion of the pipe 5 is immersed in the resin bag 14, and the resin is charged. At other times, the plug 7 is closed by the plug 7, so that the entry of foreign matter such as dust into the sub tank 3 can be drastically reduced or eliminated.

(Embodiment 2) (Configuration) Embodiment 2 of the present invention will be described with reference to FIG. In the third embodiment, since the configurations of the injection molding machine 1, the resin dryer 2, and the sub tank 3 are substantially the same as those in the first embodiment, the same elements are denoted by the same reference numerals and detailed description thereof. Is omitted.

In the second embodiment, a gas inlet 21 is provided at a position outside the position of the pipe 5 in the lid 4 of the sub-tank 3, and gas is supplied to the gas inlet 21 from outside. Injection pipe 22 for injection
Are connected at one end. The other end of the injection pipe 22 is connected to a blower 23 for blowing a clean gas from which foreign matter at a level that causes foreign matter defect has been removed by a filter. Other configurations are the same as those in the first embodiment.

(Operation) In the second embodiment of the present invention,
When charging the resin into the sub-tank 3, the clean gas sent from the blower 23 is sent into the sub-tank 3 from the gas inlet 21 through the injection pipe 22.

As a result, the inside of the sub-tank 3 becomes a negative pressure, and when the plug 7 of the pipe 5 is removed for charging the resin,
A gas flow from inside to outside occurs. In this state, the resin is put into the sub tank 3 via the pipe 5. In this case, since gas flows from the inside of the sub-tank 3 to the outside, foreign matter such as dust does not enter the sub-tank 3.

After the charging of the resin is completed and the plug 7 of the pipe 5 is closed, the blower 23 is stopped and the supply of the clean gas into the sub tank 3 is stopped.

The other operations relating to the transportation and supply of the resin are the same as those in the first embodiment.

(Effects) According to the second embodiment, the following effects can be obtained. That is, in the above-described first embodiment, the resin bag 14 is removed until the plug 7 of the pipe 5 is removed and the resin bag 14 is attached, and after the resin is charged.
There is a possibility that foreign matter in the air may enter the sub-tank 3 for a short time before the cap 7 is closed. However, in the second embodiment, a gas flow is generated from the inside of the sub-tank 3 to the outside. In addition, even when the projecting opening of the pipe 5 is open, there is an effect that foreign matter does not enter the sub tank 3.

(Embodiment 3) (Structure) Embodiment 3 of the present invention will be described with reference to FIGS. 4, 5, and 6. FIG.

In the third embodiment, the injection molding machine 1
Since the configurations of the resin dryer 2, the sub-tank 3, and the blower 23 are substantially the same as those in the second embodiment, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the third embodiment, the tip of a pipe 31 which is a resin supply pipe attached to the lid 4 of the sub-tank 3 is a ferrule port 32 having a flange having a diameter larger than the diameter of the pipe 31.

The intermediate portion of the pipe 31 has no stopper and has a straight cylindrical shape. The ferrule port 32 is closed by a stopper 33 except when the resin is charged.

Further, the first binder 34 having a structure for sandwiching a part of the resin bag 14 required for the resin charging operation.
And a second binder 35 which is a resin injection aid which is fitted around the ferrule opening 32 so as to surround the corner portion 14b of the resin bag 14.

(Operation) The operation of the third embodiment will be described with reference to FIG.
This will be described with reference to FIG.

In the third embodiment, first, as shown in FIG. 4, the corner portion 14b of the resin bag 14 is sandwiched and fixed by the first binder 34, and the outer end portion 14a is formed as shown in FIG. Although not shown, a corner portion of the resin bag 14 is slightly opened by cutting off with a cutter.

At this time, the airtightness inside the resin bag 14 is maintained because the corner portion 14b is sandwiched and fixed using the first binder 34.

Next, as shown in FIG. 6, the slightly opened corner portion 14b is put on the ferrule port 32, and the second
The binder 35 firmly fixes the corner portion 14 b of the resin bag 14 to the ferrule opening 32.

Next, the first binder 34 is removed, the corner portion 14b is released, and the resin is charged into the sub tank 3. After charging the resin, the second binder 35 is removed, the resin bag 14 is removed, and the ferrule port 32 is plugged 33.

Immediately before removing the plug 33 of the ferrule port 32,
Immediately after the plug 33 is attached, the blower 23 continuously feeds the clean gas into the sub-tank 3 as in the case of the second embodiment, to prevent dust and the like from being mixed when the resin is charged.

(Effects) According to the third embodiment, the following effects can be obtained. That is, in the shape of the pipe 5 according to the first and second embodiments, the resin entering between the stopper 6 and the protrusion of the pipe 5 may be scattered when the resin bag 14 is removed. In the embodiment 3, there is an advantage that the resin is not scattered by the action of the ferrule port 32 and the second binder 35 described above.

Further, even when the projecting opening of the pipe 5 is open, the same effect as in the case of the second embodiment is obtained, in which foreign matter does not enter the sub-tank 3.

[0047]

According to the present invention, it is possible to reliably prevent foreign matter in the atmosphere from entering the sub tank from the end of the resin supply pipe, and to prevent the occurrence of defective resin products due to foreign matter. A sub-tank for a resin dryer can be provided.

According to the present invention, in addition to the above effects,
Provided is a sub-tank of a resin dryer that can prevent foreign substances in the atmosphere from being mixed into the sub-tank even when the end of the resin supply pipe is open, and can more reliably prevent the occurrence of defective resin products due to foreign substance mixing. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a sub tank, an injection molding machine, and a resin dryer according to a first embodiment of the present invention.

FIG. 2 is a schematic front view showing a state in which a resin is supplied to a subtan according to the first embodiment of the present invention.

FIG. 3 is a schematic front view showing a sub tank, an injection molding machine, and a resin dryer according to a second embodiment of the present invention.

FIG. 4 is a schematic front view showing a sub tank, an injection molding machine, and a resin dryer according to a third embodiment of the present invention.

FIG. 5 is a schematic front view showing a sub-tank according to a third embodiment of the present invention and a resin bag whose corner portion is opened to supply resin.

FIG. 6 is a schematic front view showing a state in which resin is supplied from a resin bag to a sub tank according to Embodiment 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Resin drier 3 Subtank 4 Lid 5 Pipe 6 Stopper 7 Plug 8 Primary transport pipe 9 Hopper 10 Secondary transport pipe 11 Suction pipe 12 Pipe 13 Filter 14 Resin bag 14a Outside end 14b Corner 21 Gas inlet Reference Signs List 22 injection pipe 23 blower 31 pipe 32 ferrule mouth 33 stopper 34 first binder 35 second binder

Claims (3)

[Claims] 1. A sub-tank of a resin drier for storing and drying a resin for molding a resin product, wherein the sub-tank has an end shape capable of breaking a part of the resin bag storing the resin and immersing into the inside. A resin supply pipe for feeding resin into the sub-tank from the sub-tank. 2. A sub-tank of a resin drier for storing and drying a resin for molding a resin product, wherein the sub-tank has an end shape capable of breaking a part of the resin bag storing the resin and immersing the resin bag inside. A resin supply pipe for feeding a resin into the inside of the sub-tank, and a clean gas supply means for causing a clean gas to flow out of the resin supply pipe through the inside of the sub-tank. . 3. A sub-tank of a resin dryer for storing and drying a resin for molding a resin product, wherein the sub-tank has an end shape in which a part of the resin bag storing the resin is connected in an opened state. A resin supply pipe for feeding the resin into the sub-tank, a resin supply auxiliary tool attached to an end of the resin supply pipe so as to surround a part of the opened resin bag, and a resin supply pipe passing through the sub-tank. And a clean gas supply means for causing clean gas to flow out of the sub-tank.