JPH09239809A - Apparatus and method for producing resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a kind replacing time and minimize the production of a bad product. SOLUTION: A resin compsn. producing apparatus has such a structure that one end of a first supply pipe is connected to a melting tank 1 storing a molten resin and the inflow part of a pump 3 is connected to the other end of the first supply pipe 2 and one end of a second supply pipe 4 is connected to the outflow part of the pump 3 and a resin compsn. extraction mold 5 is connected to the other end of the second pipe 4. A first opening and closing valve 10 is provided on the way of the second supply pipe 4 and the second supply pipe 4 provided across the first opening and closing valve 10 and the pump 3 is branched to form a discharge pipe 12 and a second opening and closing valve 11 is provided on the way of the second discharge pipe 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an apparatus for producing a resin composition and a method for producing the same.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 5-124034 discloses a method for producing a strand-shaped molten raw material which is a resin composition. A general configuration of such a resin composition manufacturing apparatus is shown in FIG.

One end of a first supply pipe 52 is connected to a melting tank 51 for storing a liquid resin composition A prepared by mixing and melting various raw materials, and the first supply pipe 52
The inflow side of the pump 53 is connected to the other end of the
3, one end of a second supply pipe 54 is connected to the outflow side of the mold 3, and the other end of the second supply pipe 54 is a mold 55 for extracting the resin composition A.
Is connected. Then, the outlet 55a of the die 55
In addition, a cooling belt 56 having a plurality of water spray nozzles 57, 57 ... Is provided.

Although only one outlet 55a of the die 55 is shown in the drawing, in reality, there is a certain interval in the width direction of the die 55 (the direction perpendicular to the paper surface in the drawing). Are provided in plural. Further, reference numeral 58 in the drawing is a water tank.

That is, in this manufacturing apparatus, for example, a hot melt adhesive, which is a resin composition, is formed into a strand (a liquid adhesive has a large number of outlets 55a, 55 opened in a mold).
a ... A manufacturing device for forming a product into a product which is continuously extruded like a comb.

The operation of this manufacturing apparatus is as follows.

That is, the resin composition A stored in the melting tank 51 is supplied to the first supply pipe 52 and the second supply pipe 52 by the pump 53.
It is supplied to the mold 55 through the supply pipe 54, and the mold 55
After being formed into a sheet shape or a rod shape inside, the outlet 55a,
55a ... Is extruded as it is onto the cooling belt 56. Then, the resin composition A is gradually cooled and solidified by moving on the cooling belt 56 while being cooled by the cooling water sprayed from the water spray nozzle 57, and becomes a product.

In such a conventional manufacturing apparatus, for example, when the apparatus is temporarily stopped by changing the kind of product and then restarted with another product, the following operation is performed.

That is, the resin composition A of the previous type stored in the melting tank 51 is once cooled, solidified and extracted, and then the resin composition A of another type is charged into the melting tank 51. It will melt, mix, and start drawing.

At this time, the resin composition A of the previous type remains in the second supply pipe 54 and the mold 55 on the rear side of the pump 53. The resin composition A of the previous type remaining in the second supply pipe 54 and the mold 55 is difficult to remove by a normal operation.

Therefore, the resin composition A of the previous type which is a residue is conventionally left as it is, and the resin composition A of the previous type is removed while being washed away from behind by the resin composition A of the subsequent type. In this way, the breed was changed.

[0012]

However, according to this method, a large amount of a large amount is required until the product type is completely changed, that is, only the component of the resin composition A of the subsequent product type is extracted from the mold 55. The resin composition A is supplied onto the cooling belt 56 as a defective product in which the preceding and succeeding products are mixed.

That is, there arises a problem that a large number of defective products occur and the production cost rises, and it takes time to change the product type, which lowers the productivity. Further, there is also a problem that an extra work such as an operator peeling off the defective product supplied onto the cooling belt 56 from the cooling belt 56 is required.

The present invention was devised to solve the above problems, and the purpose thereof is to manufacture a resin composition which can shorten the time for changing the product type and the like and can minimize the occurrence of defective products. An object is to provide a device and a manufacturing method thereof.

[0015]

In order to solve the above-mentioned problems, an apparatus for producing a resin composition according to claim 1 of the present invention comprises:
One end of the first supply pipe is connected to a melting tank for storing the molten resin, the other end of the first supply pipe is connected to the inflow side of the pump, and the outflow side of the pump is connected to one end of the second supply pipe, In a resin composition manufacturing apparatus having a structure in which a mold for extracting a resin composition is connected to the other end of the second supply pipe, a first opening / closing valve is provided in the middle of the second supply pipe.
A second supply pipe between the opening / closing valve and the pump is branched to form a discharge pipe, and the second opening / closing valve is provided in the middle of the discharge pipe.

Further, in the apparatus for producing a resin composition according to claim 2 of the present invention, one end of the first supply pipe is connected to a melting tank for storing the molten resin, and the other end of the first supply pipe is connected to a pump. An apparatus for manufacturing a resin composition having a structure in which an inflow side is connected, one end of a second supply pipe is connected to an outflow side of the pump, and a mold for extracting the resin composition is connected to the other end of the second supply pipe A first opening / closing valve is provided in the middle of the second supply pipe, a second supply pipe between the first opening / closing valve and the pump is branched to form a circulation pipe, and a branch tip of the circulation pipe is formed. Is connected to the melting tank and a second pipe is installed in the middle of the circulation pipe.
An on-off valve is provided.

The apparatus for producing a resin composition according to claim 3 of the present invention is the apparatus for producing a resin composition according to claim 1 or 2, wherein when the resin composition is extracted from the mold, A valve opening / closing control unit that opens the first opening / closing valve, closes the second opening / closing valve, and closes the first opening / closing valve and opens the second opening / closing valve during operations other than the withdrawal. Prepared for configuration.

A resin composition manufacturing apparatus according to claim 4 of the present invention is the resin composition manufacturing apparatus according to claim 1, 2 or 3, wherein the first opening / closing valve and the second opening / closing valve are It is formed by a three-way valve.

Further, in the method for producing a resin composition according to a fifth aspect of the present invention, in the production apparatus according to the first aspect, the first opening / closing valve is opened when the extraction of the resin composition from the mold is completed. By switching the second on-off valve from the closed state to the closed state from the closed state to the open state, the previous resin composition remaining on the melting tank side is discharged to the outside through the discharge pipe, and after the discharge is completed. Supplying the next resin composition stored in the melting tank to the mold by switching the first on-off valve from the closed state to the open state and switching the second on-off valve from the open state to the closed state. To do.

The method for producing a resin composition according to a sixth aspect of the present invention is such that, in the production apparatus according to the second aspect, the first on-off valve is opened when the extraction of the resin composition from the mold is completed. From the state to the closed state, by switching the second on-off valve from the closed state to the open state, the previous resin composition remaining on the melting tank side is circulated to the melting tank through the circulation pipe and melted. After mixing and diluting with the next resin composition newly stored in the tank, the first on-off valve is switched from the closed state to the open state, and the second on-off valve is switched from the open state to the closed state. The following resin composition stored in the melting tank is supplied to the mold.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic structural view showing the whole apparatus for producing a resin composition according to the present invention, and corresponds to claim 1. The manufacturing apparatus shown here is a manufacturing apparatus for molding a resin composition, for example, a hot melt adhesive into a strand shape to obtain a product.

That is, one end of the first supply pipe 2 is connected to a melting tank 1 for storing a liquid resin composition A prepared by mixing and melting various raw materials, The inflow side of the pump 3 is connected to the end, and the outflow side of the pump 3 is connected to one end of the second supply pipe 4.
A mold 5 for extracting the resin composition A is connected to the other end of the supply pipe 4. At the outlet 5a of the mold 5, a cooling belt 6 having a plurality of water spray nozzles 7, 7 ... Is provided.

In such a structure, the second supply pipe 4
Is provided with a first opening / closing valve 10 in the middle thereof, and a discharge pipe 12 is formed by branching the second supply pipe 4 between the first opening / closing valve 10 and the pump 3, and in the middle of the discharge pipe 12. The second on-off valve 11 is provided. Although not shown, the switching control of the first opening / closing valve 10 and the second opening / closing valve 11 is performed by a computer that controls the operation of the entire apparatus.

Although only one outlet 5a of the die 5 is shown in the drawing, in reality, there is a certain interval in the width direction of the die 5 (the direction perpendicular to the paper surface in the drawing). Are provided in plural. Further, reference numeral 8 in the drawing is a water tank.

Next, the operation of the resin composition manufacturing apparatus having the above structure will be described.

During the normal operation of extracting the resin composition A from the mold 5, the first opening / closing valve 10 is opened and the second opening / closing valve 11 is closed. Therefore, the resin composition A stored in the melting tank 1 is supplied to the mold 5 by the pump 3 through the first supply pipe 2 and the second supply pipe 4, and in the mold 5, a sheet shape or a rod shape is formed. After being formed into the same shape, it is extruded from the outlets 5a, 5a ... As it is onto the cooling belt 6. Then, the resin composition A is gradually cooled and solidified by moving on the cooling belt 6 while being cooled by the cooling water sprayed from the water sprinkling nozzle 7 to be a product.

Next, the operation when the apparatus is once stopped by changing the product type and then restarted with another product type will be described.
However, for convenience of explanation, the type of the resin composition A is distinguished by adding a number after the symbol A.

In this case, after the extraction operation of the resin composition A1 of the previous type is completed, the resin composition A2 of the next type is put into the melting tank 1 to melt and mix, and
The on-off valve 10 is switched to the closed state and the second on-off valve 11 is switched to the open state.

When the pump 3 is operated again in this state,
The resin composition A2 stored in the melting tank 1 is pushed out by the pump 3 into the first supply pipe 2. Therefore, the resin composition A1 of the previous type remaining in the second supply pipe 4 is pushed out to the discharge pipe 12. At this time, the discharge pipe 1
If the defective product receiving portion 13 is provided at the discharge port of 2, the operator can visually check the defective product.

After confirming that the defective product of the previous type has been completely pushed out, the first opening / closing valve 10 is switched to the open state and the second opening / closing valve 11 is switched to the closed state. Is supplied to the mold 5 through the second supply pipe 4,
After being formed into a sheet shape, a rod shape, or the like in the mold 5, it is extruded as it is onto the cooling belt 6 through the outlets 5a, 5a ....

It should be noted that when restarting the operation with a different product, the resin composition A1 of the previous product slightly remains in the second supply pipe 4 and the mold 5 on the mold 5 side of the first opening / closing valve 10. However, as a result, the number of defective products extracted from the mold 5 is small, and therefore the work of stripping the defective products by the operator can be completed in a shorter time than the conventional device.

In order to minimize the generation of defective products due to such residues in the mold 5, the first opening / closing valve 10 is provided as close to the mold 5 as possible, and the discharge pipe 1 is provided.
Needless to say, 2 also needs to branch near the first opening / closing valve 10.

In the above embodiment, the first opening / closing valve 10
The second supply pipe 4 by switching between the second opening and closing valve 11 and
The first opening / closing valve 10 and the second opening / closing valve 11 can be replaced with a single three-way valve.

FIG. 2 is a schematic block diagram showing the whole apparatus for producing a resin composition according to the present invention, and corresponds to claim 2.

That is, one end of the first supply pipe 2 is connected to the melting tank 1 for storing the liquid resin composition A prepared by mixing and melting various raw materials, The inflow side of the pump 3 is connected to the end, and the outflow side of the pump 3 is connected to one end of the second supply pipe 4.
A mold 5 for extracting the resin composition A is connected to the other end of the supply pipe 4. At the outlet 5a of the mold 5, a cooling belt 6 having a plurality of water spray nozzles 7, 7 ... Is provided.

In such a structure, the second supply pipe 4
Is provided with a three-way valve 14 in the middle thereof.
A circulation pipe 15 is provided between the melting tank 1 and the melting tank 1. Although not shown, the switching control of the three-way valve 14 is performed by a computer that controls the operation of the entire apparatus.

Although only one outlet 5a of the die 5 is shown in the drawing, in reality, there is a certain interval in the width direction of the die 5 (the direction perpendicular to the paper surface in the drawing). Are provided in plural. Further, reference numeral 8 in the drawing is a water tank.

The manufacturing apparatus of the above-described embodiment is a particularly effective apparatus in the case where the former kind and the latter kind may be mixed to some extent.

Next, the operation of the apparatus for producing a resin composition having the above construction will be described.

During the normal operation of extracting the resin composition A from the mold 5, the three-way valve 14 is switched so that the second supply pipe 4 is opened and the circulation pipe 15 is closed. Therefore, the resin composition A stored in the melting tank 1 is supplied to the mold 5 by the pump 3 through the first supply pipe 2 and the second supply pipe 4, and in the mold 5, a sheet shape or a rod shape is formed. After being molded into the same shape, the outlet 5
It is extruded on the cooling belt 6 as it is from a, 5a .... Then, the resin composition A is gradually cooled and solidified by moving on the cooling belt 6 while being cooled by the cooling water sprayed from the water sprinkling nozzle 7 to be a product.

Next, the operation in the case where the apparatus is once stopped by changing the product type and then restarted with another product type will be described.
However, for convenience of explanation, the type of the resin composition A is distinguished by adding a number after the symbol A.

In this case, after the extraction operation of the resin composition A1 of the previous type is completed, the resin composition A2 of the next type is put into the melting tank 1 to be melted and mixed, and the second
The three-way valve 1 so that the supply pipe 4 is closed and the circulation pipe 15 is opened.
Switch 4

When the pump 3 is operated again in this state,
The resin composition A2 stored in the melting tank 1 is pushed out by the pump 3 into the first supply pipe 2. Therefore, the resin composition A1 of the previous type remaining in the second supply pipe 4 is pushed out to the circulation pipe 15 and circulated in the melting tank 1. Then, the resin composition A1 which is the recycled previous product type
Will be diluted with a large amount of the resin composition A2, which is a post-product type, that has been put into the melting tank 1.

After the residual resin composition A1 of the previous type is mixed with the resin composition A2 of the subsequent type and completely diluted, the second supply pipe 4 is opened and the circulation pipe 15 is closed. The three-way valve 14 is switched so that However, whether or not the dilution is completed is to be confirmed in advance by an experiment or the like, and the dilution time is set as the switching time of the three-way valve 14 (about 10 minutes).

Therefore, the resin composition A2 of the following product type
Is supplied to the mold 5 through the second supply pipe 4 and the three-way valve 14, and is molded into a sheet shape, a rod shape, or the like in the mold 5, and then is directly cooled from the outlets 5a, 5a ... It will be pushed onto the belt 6.

When the restart of another product is started, the resin composition A1 of the previous product is slightly left in the second supply pipe 4 and the mold 5 on the mold 5 side of the first opening / closing valve 10. However, as a result, the number of defective products extracted from the mold 5 is small, and therefore the work of stripping the defective products by the operator can be completed in a shorter time than the conventional device.

Further, in order to suppress the generation of defective products due to such residues in the mold 5, it is necessary to provide the three-way valve 14 as close to the mold 5 as possible.

In the above embodiment, the second supply pipe (more precisely, the second supply pipe between the three-way valve 14 and the mold 5) 4 and the circulation pipe 15 are switched by switching the three-way valve 14. However, as shown in FIG. 1, the first on-off valve 1
The second supply pipe 4 and the circulation pipe 15 may be switched by switching between 0 and the second on-off valve 11.

[0050]

The apparatus for producing a resin composition according to claim 1 of the present invention is provided with a first opening / closing valve in the middle of the second supply pipe, and a second supply between the first opening / closing valve and the pump. The pipe is branched to form a discharge pipe, and a second opening / closing valve is provided in the middle of the discharge pipe. When the resin composition is completely extracted from the mold, the first opening / closing valve is changed from the open state to the closed state. In addition, by switching the second on-off valve from the closed state to the open state, the previous resin composition remaining on the melting tank side is discharged to the outside through the discharge pipe, and after the discharge is completed, the first on-off valve is closed. By switching the state from the open state to the open state and opening the second open / close valve from the open state to the closed state, the next resin composition stored in the melting tank is supplied to the mold. Further, in the apparatus for producing a resin composition according to claim 2 of the present invention, a first on-off valve is provided in the middle of the second supply pipe, and the second supply pipe between the first on-off valve and the pump is branched. To form a circulation pipe, connect the branching tip end of the circulation pipe to the melting tank, and provide a second opening / closing valve in the middle of the circulation pipe to complete the extraction of the resin composition from the mold. By circulating the first on-off valve from the open state to the closed state and by switching the second on-off valve from the closed state to the open state, the previous resin composition remaining on the melt tank side is circulated to the melt tank through the circulation pipe. Then, after mixing and diluting with the next resin composition newly stored in the melting tank, by switching the first on-off valve from the closed state to the open state and the second on-off valve from the open state to the closed state, respectively, To supply the next resin composition stored in the melting tank to the mold To have. Therefore, defective products are less likely to occur when the product type is changed, and the production cost can be reduced accordingly. In addition, the time required for changing the product type can be significantly reduced, and the work for removing defective products can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an entire apparatus for producing a resin composition according to the present invention, which corresponds to claim 1.

FIG. 2 is a schematic configuration diagram showing an entire apparatus for producing a resin composition according to the present invention, which corresponds to claim 2.

FIG. 3 is a schematic configuration diagram showing an entire conventional apparatus for producing a resin composition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting tank 2 1st supply pipe 3 Pump 4 2nd supply pipe 5 Mold 10 1st on-off valve 11 2nd on-off valve 13 Discharge pipe 14 Three-way valve 15 Circulation pipe

Claims (6)

[Claims] 1. A melting tank for storing molten resin is connected to one end of a first supply pipe, the other end of the first supply pipe is connected to an inflow side of a pump, and the outflow side of the pump is connected to a second supply pipe. In a resin composition manufacturing apparatus having a structure in which one end is connected and a mold for extracting a resin composition is connected to the other end of the second supply pipe, a first opening / closing valve is provided in the middle of the second supply pipe. A resin composition characterized in that a discharge pipe is formed by branching a second supply pipe between the first on-off valve and the pump, and a second on-off valve is provided in the middle of the discharge pipe. Manufacturing equipment. 2. A melting tank for storing molten resin is connected to one end of a first supply pipe, the other end of the first supply pipe is connected to an inflow side of a pump, and the outflow side of the pump is connected to a second supply pipe. In a resin composition manufacturing apparatus having a structure in which one end is connected and a mold for extracting a resin composition is connected to the other end of the second supply pipe, a first opening / closing valve is provided in the middle of the second supply pipe. A circulation pipe is formed by branching a second supply pipe between the first on-off valve and the pump, and a branching tip portion of the circulation pipe is connected to the melting tank, and a second pipe is provided in the middle of the circulation pipe. 2. An apparatus for producing a resin composition, which is provided with an on-off valve. 3. The first opening / closing valve is opened when the resin composition is extracted from the mold, and the second opening / closing valve is closed when the resin composition is extracted, and the first opening / closing valve is operated during operations other than the extraction. 3. The apparatus for producing a resin composition according to claim 1, further comprising a valve opening / closing control unit that closes the second opening / closing valve and opens the second opening / closing valve. 4. The apparatus for producing a resin composition according to claim 1, wherein the first on-off valve and the second on-off valve are three-way valves. 5. The apparatus for producing a resin composition according to claim 1, wherein when the resin composition is completely removed from the mold, the first opening / closing valve is changed from an open state to a closed state, and the second opening / closing valve is opened. By switching from the closed state to the open state, the previous resin composition remaining on the melting tank side is discharged to the outside through the discharge pipe, and after the discharge is completed, the first resin composition is discharged.
The next resin composition stored in the melting tank is supplied to the mold by switching the open / close valve from the closed state to the open state and switching the second open / close valve from the open state to the closed state. And a method for producing the resin composition. 6. The apparatus for producing a resin composition according to claim 2, wherein when the extraction of the resin composition from the mold is completed, the first on-off valve is changed from an open state to a closed state, and the second on-off valve is opened. By switching from the closed state to the open state, the previous resin composition remaining on the melting tank side is circulated through the circulation pipe to the melting tank, and the next resin composition newly stored in the melting tank is circulated. The following resin composition stored in the melting tank by switching the first on-off valve from the closed state to the open state and the second on-off valve from the open state to the closed state after mixing and diluting with the substance Is supplied to the mold, and a method for producing a resin composition.