JPH0649319B2 - Composite adapter for extrusion - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite adapter applied to an extrusion molding apparatus such as a plastic composite film or sheet.

(Prior Art) FIG. 7, FIG. 8 and FIG. 9 show an example of a conventional device which is a composite adapter for three-layer extrusion.

FIG. 7 is a schematic top view of the apparatus, FIG. 8 is a sectional view taken along line AA of FIG. 7, and FIG. 9 is a sectional view taken along line BB of FIG.

The melt supplied from the three extruders 1A, 1B, 1C is the conduits 2A, 2
It is guided to the flow path switching plate 4 by B, 2C and the adapter 3. The flow path switching plate 4 has a flow path 4 for determining whether the melt extruded from the die (molding die) 6 is to be brought to the upper layer, the middle layer, or the lower layer of the product supplied from each extruder.
A, 4B, 4C are provided, and the flow paths 4A, 4B, 4C are the adapter 3
The flow paths 3A, 3B, 3C are connected to the flow paths 5A, 5B, 5C of the composite adapter 5 according to the layer structure.

An insert body 7 having merged channels 7A, 7B, 7C for stacking and joining the melts is fitted in the center of the composite adapter 5 parallel to the die 6 and at a right angle to the channel, and the plate 8, packing 9, nut It is fixed to the composite adapter 5 by 10.

10, 11 and 12 are detailed views of the insert 7, the fixing plate 8, the packing 9 and the nut 10. FIG. 11 is a view of FIG. 10C, and FIG. 12 is D of FIG. -D shows a cross section.

13 and 14 show the cross-sectional shapes of the joint channels 7A, 7B, 7C at the confluence of the melts in the EE cross section of FIG. FIG. 13 shows that the widths w ₁ , w ₂ and w ₃ of the joint channels 7A, 7B and 7C are different, and FIG. 14 shows the widths w ₁ , w ₂ and w _{3 of the} joint channels 7A, 7B and 7C.
Indicate the same thing.

The melt extruded from each extruder 1A, 1B, 1C in this apparatus is guided to the flow path switching plate 4 through the conduits 2A, 2B, 2C and the flow paths 3A, 3B, 3C of the adapter.

The flow path switching plate 4 is provided with flow paths 4A, 4B, and 4C according to the required layer configuration, which are connected to the flow paths 5A, 5B, and 5C of the composite adapter 5, respectively, and the combined flow path 7A of the insertion body 7A, It is guided to 7B and 7C, laminated together, and extruded from the die 6 as a three-layer sheet or film.

This device is disclosed in Japanese Utility Model Application No. 58-094864 (Actual development number 59-2).
20332) and Japanese Patent Application No. 60-083023 and the like.

By the way, when melts having different viscosities are laminated by such an apparatus, uniform widths are not uniform at the exit of the die 6, and for example, as shown in FIG.
When the viscosity of the surface layer (melts of 7B and 7C) is lower than that of the center (melt of 7A) when B and 7C have the same width, each laminate at the die exit is shown in Fig. 15. As described above, it is known that the melts 7b and 7c in the surface layer do not wrap around at both ends to form a uniform and uniform width laminate.

It is also known that this wraparound amount increases as the distance from the merging portion to the die outlet increases, and increases as the viscosity difference increases. In order to adjust the amount of this wrap-around and obtain a laminate having a uniform width over the entire width at the die outlet as shown in FIG. 16, as shown in FIG. 11 and FIG.
It was necessary to prepare the flow path widths w ₂ and w ₃ of the merging portion which were smaller than the central flow path width w ₁ .

However, as described above, the amount of wraparound also varies depending on the composition of each melt (viscosity difference and required layer thickness),
It is extremely difficult to prepare an insert with an appropriate flow channel width, and at the same time, it is necessary to prepare many types of inserts. It had disadvantages such as the need to replace it.

(Problems to be Solved by the Invention) As described above, the related art has the following problems.

(1) It is difficult to determine each flow path width suitable for the laminate.

(2) It is necessary to prepare many inserts having a flow passage width suitable for each different structure of the laminated body.

(3) It is necessary to stop the operation and replace the insert to change the channel width.

The present invention was developed to solve such problems, and it is an object of the present invention to provide a composite adapter for extrusion molding in which each channel width can be easily changed according to the configuration of the melt to be laminated. .

(Means for Solving the Problems) For this reason, the present invention is provided between a plurality of conduits for guiding a melt and a molding die for laminating and molding a plurality of melts to melt the conduit and the molding die. In a composite adapter in which an insert for communicating with the object receiving port and forming a joint flow path between the wall surfaces is inserted into the insertion hole, the wall surface of the insertion hole of the composite adapter and the wall surface of the flow path of the insert body are formed. The cross section of the merged channel is formed in a wedge shape, and each wall surface of the merged channel immediately before the merged portion is in contact with each other or has a proper clearance for preventing retention and is parallel to the axis of the insert body. An adjustment bar that can adjust each stacking width in the joint flow channel to be suitable for the combination of resins is movably inserted into the joint flow channel from the outside, and this is used as a means for solving the problem. To do.

(Operation) In the composite adapter of the prior art, a wedge-shaped wall surface which is externally adjustable to a part or all of the flow path formed by the wall surface of the insert body and the wall surface of the insert hole and which includes the insert hole and the insert body flow path. An adjustment bar is installed so as to contact with, and the lamination width of the laminated melt can be adjusted without replacing parts.

Further, by allowing the adjusting lever to be adjusted by a mechanism such as a screw or a hydraulic pressure, the width adjustment and the flow passage cleaning can be easily performed during operation.

As a result, it is possible to arbitrarily create an appropriate flow channel width suitable for the structure of the laminated body, and it is possible to easily change the flow channel width without disassembling the adapter or replacing the insert body. There is no loss in determining the width.

(Example) Hereinafter, the Example of this invention is described based on drawing.

1 is a top view of an insert showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow G in FIG. 1, FIG. 3 is a view taken in the direction of arrow H in FIG.
1 is a sectional view taken along line F-F in FIG. 1, and FIG. 5 is a sectional view taken along line I-I in FIG. 4 (merging portion resin flow path).

As is apparent from the drawings, the present invention is characterized by the insert 7 inserted into the insertion hole of the composite adapter 5. The insert of the present invention is different from the conventional insert in FIGS.
As shown in the figure, the flow paths 7A, 7B, 7C to be processed into the insert are all formed to have the same width w ₁ . Composite adapter 5 as shown in FIG.
Wall surface 5'of the insertion hole and wall surfaces 7B ', 7C' of the flow path of the insert 7
The cross sections of the combined flow paths 7B and 7C formed by and are formed in a wedge shape, respectively. The shafts of the insert body 7 are in contact with each other between the wall surfaces of the joint flow passages 7B and 7C (wall surface 5'and wall surface 7B 'and wall surface 5'and wall surface 7C') with appropriate clearances to prevent retention. 4 adjustment bars 11A, 11B, 11 parallel to the core
Two C and 11D from each end of the insert 7, each of which is the second
It is fitted so that it can move up and down in the figure.

12 fixed to both ends of the insert 7 are blocks for sealing and fixing. It is to be noted that each end of each adjustment bar 11A~11D as shown in Figure 6, may be provided an adjusting device 13 by mechanism such as a screw or hydraulic, in this case, laminated width w ₂ of the surface layer side of the melt , it is easy cleaning of becoming not flow path only the adjustment of the w _3.

8 is a plate for fixing the insert 7, 9 is packing, 10
Is a nut. As described above, in the conventional composite adapter, as shown in FIG. 11, from among a large number of inserts having flow passage widths w ₂ and w ₃ that match or may match the structure of the laminated body, Select it, insert it into the insertion hole 5'of the composite adapter 5, and look at the extruded laminated body. If there is a lot of wraparound at both ends of the surface layer, the smaller one of w ₂ and w ₃ should be reversed at both ends. If the surface was not rotating, I had to take the procedure of replacing w ₂ and w ₃ with larger ones.

When the insert 7 according to the present embodiment is used, if there is a large amount of wraparound at both ends of the upper surface layer, the upper and lower adjustment bars 11A and 11B on the right side in FIG. If it is adjusted to the outside, and in the case of the lower surface layer, while adjusting the upper and lower two adjustment bars 11C and 11D on the left side of the figure in the same manner, the flow passage width most suitable for the structure of the laminated body as illustrated in FIG.
w ₂ and w ₃ can be easily found.

In addition, this adjustment can be performed from the outside without removing the insert 7, and if adjustment during operation is difficult, this can be easily done by additionally installing the adjusting device 13 using screws or hydraulic pressure. Can be done. In addition, each adjustment bar 11A-1
Even if you are worried about the melt staying in the 1D upstream channel, you can easily clean the remaining channel by inserting and removing the target adjustment bar during operation without disassembling it again. .

(Effect of the Invention) As described above in detail, in the extrusion molding composite adapter according to the present invention, it is not necessary to prepare many inserts in order to obtain an appropriate insert as in the conventional case. Both cost and management are more efficient.

As described above, according to the present invention, it is not necessary to replace the insert body for width adjustment, a high-quality laminate can be obtained without stopping the operation, and at the same time, raw material loss can be significantly suppressed.

In addition, the adjusting bar of the present invention corrects the wrap-around phenomenon of the low-viscosity resin due to the difference in the viscosity of the combination resin, which is an obstacle to this, in order to obtain a multilayer resin molded product having a uniform thickness, and therefore, the laminated melt of the joint channel is melted. It is for adjusting the width of the object,
The resin molded body having a uniform thickness can be easily obtained without disassembling and replacing the constituent parts. Therefore, according to the present invention, even if the combination of resins is changed, the width of the combined resin can be adjusted by adjusting the adjusting bar from the outside without exchanging the parts constituting the joining portion, and the resin having a uniform thickness can be adjusted. A molded body can be easily obtained. That is, it is sufficient that the parts forming the resin confluence part have a set, and there is no need to disassemble or replace the parts for adjustment.

[Brief description of drawings]

FIG. 1 is a top view of an insert body to be inserted into a composite adapter showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow G in FIG. 1, FIG. 3 is a view taken in the direction of arrow H in FIG. FIG. 5 is a sectional view taken along the line F-F in FIG. 1, and FIG. 5 is a sectional view taken along the line I-I in FIG.
FIG. 6 is a partial top view of an insert body additionally provided with an adjusting device showing another embodiment, FIG. 7 is a schematic top view of a general composite molding device, and FIG. 8 is AA of FIG. Sectional view, FIG. 9 is a sectional view taken along line BB in FIG. 8, FIG. 10 is a top view of an insert body to be inserted into a conventional composite adapter, FIG. 11 is a view taken in the direction of arrow C in FIG. 10, and FIG. FIG. 12 is a sectional view taken along line DD of FIG. 4, and FIGS. 13 and 14 are sectional views showing different flow passage cross sections at the confluence portion.
E-E sectional view of the figure, FIG. 15 and FIG. 16 are different sectional views of the laminated body at the die exit. Explanation of the main parts of the figure 2A, 2B, 2C …… Conduit 5 …… Composite adapter 5A, 5B, 5C …… Internal adapter flow path 6 …… Die (molding die) 7 …… Insert 13 …… Adjusting device

Claims (1)

[Claims] 1. A pipe is provided between a plurality of conduits for guiding a melt and a molding die for laminating and molding a plurality of melts so that the conduit and a melt inlet of the molding die are in communication with each other, and between wall surfaces. In the composite adapter in which the insert body that forms the joint flow path is inserted into the insertion hole, while forming a wedge-shaped cross section of the joint flow path formed by the wall surface of the insertion hole of the composite adapter and the wall surface of the flow path of the insert body, Between the respective wall surfaces of the confluence channel immediately before the confluence part, each laminated width in the confluence channel is in contact with each other or provided with an appropriate clearance for preventing retention while being parallel to the axis of the insert. A composite adapter for extrusion molding, characterized in that an adjusting bar that can be adjusted to a suitable combination is inserted into the joint flow passage so as to be movable from the outside.