JPH0218024A - Composite adapter for extrusion - Google Patents

Abstract

PURPOSE:To prevent the heat deterioration and flowing disorder of a melt, and improve the thickness accuracy of respective layers throughout the whole width of a sheet or film by incorporating an adjusting bar capable of adjusting the laminating width and end part laminating thickness of a laminating melt into a part or whole part of each joining part of a passage. CONSTITUTION:Adjusting bars 111A-111D are inserted into the joining part of surface layer side passages 7B, 7C, and the widths W2, W3 in joining part of the passages 7B, 7C are adjusted, as well as, the gaps H1, H2 of the passages 7B, 7C of notched parts formed in the inserting part of respective adjusting bars 111A-111D are adjusted arbitrarily through the rotation of the adjusting bars 111A-111D. By this manner, the fine adjustment of each thickness of a film (or sheet) can be carried out, so that it makes possible to produce a film (or sheet) with an excellent accuracy in each layer throughout the whole width. And, since the melt is not cut off completely by the adjusting bars 111A-111D, the occurrence of heat deterioration substances and the disorder of laminating conditions in a joining period, besides, since the lamination at the surface layer sides is performed all over the width, a good product without any spew of an inner layer side melt can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a composite adapter for extrusion molding that is applied to multilayer film manufacturing equipment, multilayer sheet manufacturing equipment, etc.

(Prior Art) The prior art will be described with reference to FIGS. 7 to 18, taking as an example a manufacturing apparatus for a sheet or film having a three-layer structure.

Figure 7 is a top view of the main parts showing the external appearance of the device, and Figure 8 is a top view of the main parts showing the appearance of the device.
FIG. 9 is a sectional view taken along line EE in the figure, and FIG. 9 is a sectional view taken along line FF in FIG.

The melts supplied from the three extruders IA, IB, and IC are guided to a flow path switching plate 4 by conduits 2A, 2B, and 2C and an adapter 3. The flow path switching plate 4 has flow paths 4A, 4B, and 4C that determine which of the upper layer, middle layer, and lower layer of the product extruded from the die (forming die) 6 the molten material supplied from each extruder is brought to. is provided, and its flow path 4A,
4B and 4C are flow paths 3A of the adapter 3.

3B, 3C and flow paths 5A, 5B, 5C of composite adapter 5
They are communicated according to the two-layer configuration.

In the center of the composite adapter 5, there is a substantially cylindrical insert 7 having merging channels 7A, 7B, and 7C for laminating and merging each melt.
is fitted parallel to the die 6 and at right angles to the flow path, and is fixed to the main body of the composite adapter 5 by a fixing plate 8, a packing 9, and a nut 10.

10 to 15 show details of the insert body 7 and its peripheral members, such as the fixing plate 8, gasket 9, nut 10, adjustment bar 11, and fixing block 12, and FIG. 10 shows how to assemble these members. Figure 11 is a cross-sectional side view of a part when attached, Figure 11 is the G homeland in Figure 1θ, Figure 12 is the H view in Figure 11, and Figure 13 is the J-J sectional view in Figure 10. be. Further, FIGS. 14 and 15 show examples of cross-sectional shapes of the merging paths 7A, 7B, and 7C at the merging portion of each melt in the II cross section of FIG. 13, and FIG. ,7B,
7C width Wl, Wg.

FIG. 15 shows an example in which W is different for each merging path 7A, 7B, 7.
Examples are shown in which the widths Wl, Wz, and W3 of C are the same.

In this apparatus, the melt extruded from each of the extruders LA, 1B, and IC is guided to the flow path switching plate 4 through the conduits 2A, 28.2C and the flow paths 3A, 3B, and 3C of the adapter 3.

The flow path switching plate 4 has flow paths 4A and 4B depending on the required layer configuration.
, 4C are provided, each connected to each channel 5A, 58.5C of the composite adapter 5, and a confluence channel 7A, 58.5C of the insert body 7.
7B and 7C, are laminated and merged, and extruded from a die 6 as a three-layer sheet or film.

This device is a known technique, for example, as disclosed in Japanese Patent Application No. 155956/1982 (Japanese Patent Application Laid-open No. 13730/1983).

By the way, when melts of different viscosities are layered in such an apparatus, each layer does not have a uniform width at the exit of the die 6, and for example, as shown in FIG. are the same width, and if the viscosity of the surface layer (melts of 7B and 7C) is lower than that of the center (melt of 7A), each laminate at the die exit
As shown in FIG. 6, it is known that the melts 7b and 7c on the surface layer wrap around both ends, making it impossible to obtain a laminate with uniform width.

It is known that the amount of wrap-around increases as the distance from the merging part to the die exit increases, and as the viscosity difference increases. In order to obtain a laminate that is uniform across the entire width as shown in FIG. 18, the channel widths Wl and W3 on the surface layer side of the merging section are changed to the center channel width w, as shown in FIGS. 11 and 14.
It is known to set the value smaller than 1.

However, in order to adjust the channel widths wt and w3 on the surface layer side, adjustment bars 11A-110 as shown in FIG. Adjust the width of the channel on the surface layer W! , W3 is the central channel width W
, when making the size smaller, the melt is blocked by each adjustment bar 11A to 110, and the melt stays in the upstream part of each adjustment bar 11A to 110, and furthermore, the melt is blocked by each adjustment bar 11A to 110, and the melt remains in the downstream part of the adjustment bar and the central flow path 7A. Until the melt confluence point (7 in Figure 13)
K and 7v) also have stagnation areas, and the burning of the melt not only causes disturbances in the flow of each layer during stacking, but also, depending on the melting conditions, as shown in Figure 17, the surface layer may not be on top of the inner layer. This may cause the inner layer to wrap around the surface layer at the die exit.

(Problems to be Solved by the Invention) In other words, the following problems remain to be solved in the conventional technique of simply adjusting the flow path cross-sectional width of the merging section by operating an adjustment bar.

(1) Because the channel width adjustment at the merging section is performed by inserting an adjustment bar into the flow channel, there are stagnation points before and after the adjustment bar, which causes thermal deterioration of the melt and turbulence in the flow at the time of merging. (sections 7x and 7v in Figure 13).

(2) At the same time, the adjustment bar insertion part is completely blocked from the molten material, so the molten material from the inner layer wraps around and protrudes from the film (or sheet) extruded from the die without the surface layer being laminated. There were problems such as (Figure 17).

In order to solve these problems, the present invention makes it possible to change the width of the flow path in the surface layer, and at the same time allows some flow without completely blocking both ends of the flow path, so that the layer thickness can be adjusted during operation. The object of the present invention is to provide a composite adapter for extrusion molding that eliminates thermal deterioration of the melt and turbulence of the flow, and that produces a laminated product with good thickness accuracy of each layer over the entire width of the sheet or film.

(Means for Solving the Problems) For this reason, the present invention has a replaceable insert body in which a channel for merging a plurality of melts is formed in the center of the main body, and a conduit for guiding a plurality of melts. A composite adapter for extrusion molding is provided between a molding guide for laminating and molding each melt, and communicates the conduit with a melt receiving port of the molding die,
A means for solving the above problem is to incorporate an adjustment bar into a part or all of each convergence part of the flow path, which can adjust the lamination width and end lamination thickness of the laminated melt. .

To describe this specifically, for example, the adjustment bar is attached to the inserter via an adjustment nut so that the insertion length can be adjusted, and the adjustment bar is inserted or removed by turning the adjustment nut. In addition, in the insertion part of the adjustment bar, a part of the circular cross section is cut out to a desired length in the longitudinal direction so that the laminated thickness of the molten material in that part can be adjusted, and the adjustment bar is rotatably installed. do. Note that, if necessary, a pointer plate and a scale plate are provided at the outer end of the adjustment bar so that the adjustment state of the gap between the adjustment bar notch and the main body insertion hole can be seen.

(Function) +1) Improve the thickness accuracy over the entire width of the film (or sheet) by making it possible to change the fixed flow path width at the confluence part and adjusting the amount of lamination at both ends of the film (or sheet). At the same time, it prevents the surface layer side resin from wrapping around or the inner layer side resin from protruding at both ends.

(2) A notch is provided in the insertion part of the adjustment bar into the merging channel to form a flow path, and by rotating this by a desired angle, the gap between the inner wall surface of the insertion hole and the notch part of the adjustment bar is adjusted. At this time, by limiting the rotation angle to a range that does not completely block the flow path, it is possible to eliminate the stagnation of the melt, and also to eliminate the turbulence of the flow at both ends of the wave path.
Improve the thickness accuracy of each layer of the ear part.

(3) The adjustment bar can be adjusted in and out from the outside by, for example, rotating an adjustment nut exposed outside the composite adapter body, and if a scale plate is provided to check the rotation angle of the adjustment bar, This leads to improved workability and reproducibility.

(4) For the length of the notch part of the adjustment bar, prepare in advance one with a size that matches the flow characteristics of the laminated resin, and replace it with this one. For this replacement, if the adjustment bar of the present invention is made of, for example, a round bar, it can be easily replaced and can be replaced in a short time.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure is a front view of the insert showing a typical embodiment of the present invention.
The figure is a view taken in the direction of arrow A in Fig. 1, Fig. 3 is a sectional view taken along line B-B in Fig. 1, Fig. 4 is a sectional view taken along C-C in Fig. 1, and Fig. 5 is a sectional view taken along line C-C in Fig. 3. DD sectional view, and FIG. 6 shows a sheet sectional view.

As is clear from the drawings, the present invention is characterized by the insert 7 that fits into the insertion hole of the composite adapter 5 and the adjustment bars 111A to 1110 that adjust the laminated state of the confluence channel.

In the insert 7 of this embodiment, as shown in FIG. 1, the merging channels 7A, 7B, and 7C formed in the insert 7 are all formed to have the same width W as in the conventional case.

That is, for the surface layer side confluence channels 7B and 7C, as shown in FIG.
Each merging path 7B is formed between the processed wall surfaces 7B' and 7G' of
, 7C is formed, and a confluence channel 7A on the inner layer side is formed at its exit.
It is configured to merge with. Confluence path 7B on each surface layer side,
Near the confluence of 7C, there are inserts 7 at both ends in the width direction.
Adjustment bars 111A, 111B, 111C, and 111D are inserted from the outside through portions of the holder (12, 13, 14, etc.) consisting of blocks 12, 13, adjustment nuts 14, etc. from both sides, respectively. Adjustment bars 111A to 111
A notch having a desired length in the longitudinal direction is formed in the portion of D inserted into the merging path 78.7C, and the flow is formed in the gap between the notch and the inner wall surface 5' of the insertion hole of the composite adapter 5. Road 7B
",7C" is formed.

The other end of each adjustment bar 111A to 111D is threaded in order to screw in the adjustment nut 14, and a pointer plate 15 is screwed into the tip thereof. It is fixed at 111A to 111D.

The block 12 is a spacer considering the workability of the adjustment bars 111A to 1110, and together with the block 13 that supports the adjustment nut 14, the bolt 2 is attached to the insert body 7 and the fixing plate 8.
It is collinear with 1. The adjustment nut 14 is the adjustment bar 11
This is to adjust the insertion length of blocks 1A to 111D.
By turning the adjusting nut 14, which freely rotates in 2.13, the desired adjusting bar 111A to 1110 is moved into or out of each confluence channel 7B, 7C of the insert 7. Adjustment nut 14
After adjusting the insertion length of each adjustment bar 111A to 1110, the set screw 22 is tightened to fix the rotation of the adjustment nut 14.

The pointer plate 15 has adjustment bars 111A to 1110 as described above.
The notch position (angle) of the adjustment bar is indicated by a scale plate 16 fixed to the block 12 with screws 20 so that the position can be confirmed. That is, in FIG. 3, it is possible to judge the condition of the gap between the flow paths 7B'' and 70'' from the outside. After adjusting the notch position, each adjustment bar 111A to 1110 is fixed by tightening the lock nut 17. The insert body 7 is inserted from one of the insertion holes of the composite adapter 5, and its end is held in place by a fixing plate 8 and a gasket 9, and is tightened and fixed with a nut 10.
The position with respect to the insert body 7 is fixed by 8.

As shown in FIGS. 10 to 15 and described above (in the conventional composite adapter, only the widths Wg and W3 of the surface flow channels 7B and 7C are adjusted by the adjustment bars 11A to 110; Because the insertion ends of the bars 11A to 110 block a portion of each flow path 7B and 7C, heat-degraded substances may be generated due to retention during film (or sheet) forming, and the flow paths must be cleaned to remove this. In addition, if the laminated state is disturbed or the inner layer protrudes, there is no countermeasure against this, and the adjustment bars 11A to 110 must be inserted at the cost of sacrificing the thickness accuracy of each layer at the edge of the film (or sheet). Measures such as reducing the amount were required.

In this embodiment, adjustment bars 111A to 111D are inserted into the confluence of the surface-side channels 7B and 7C, and the width w2. w3 and the gap 0+ between the channels 7B'' and 7C'' in the cutout portions formed in the insertion portions of each of the adjustment bars 111A to 111D.

Since H2 can be adjusted arbitrarily by rotating the adjustment bars 1118 to 1110, the thickness of each layer of the film (or sheet) can be finely adjusted, making it possible to produce a film (or sheet) with excellent thickness accuracy for each layer over the entire width. It makes it possible.

In addition, because the melt is not completely blocked by the adjusting bar 111A-1110 due to the notch, there is no generation of heat-degraded products due to stagnation or disturbance of the laminated state during merging, and in addition, the laminated material on the surface side is spread over the entire width. Since they are laminated, a good product with no protrusion of the molten material on the inner layer side as shown in FIG. 6 can be obtained.

In addition, if you want to change the adjustment width of the adjustment bar, you can simply replace it with an adjustment bar with a different size of the notch, and if it is made of a thin round bar like this example, the replacement will be easier and faster. . Further, in the above embodiment, a case has been described in which the adjusting operations of the adjusting nut 14 and the adjusting bars 111A to 1110 are performed manually, but it is also possible to adjust both automatically from the outside via an appropriate transmission mechanism. Further, in the above embodiment, the adjustment bar is provided only in the surface layer side flow path, but it can also be provided near the outlet of the inner layer side flow path.

(Effects of the Invention) As explained in detail above, in the composite adapter for extrusion molding according to the present invention, the film (or sheet)
There is no disturbance in the laminated state at both ends of the film, there is no protrusion of the inner layer resin, there is no burning due to retention, and therefore there are no problems such as poor thickness accuracy of each layer, and there is no need to adjust the thickness of the film (or sheet). To change a large pattern, move the adjustment bar in and out of the flow path, and to adjust both ears, simply rotate the adjustment bar during operation. This allows for the formation of films (or sheets) with good thickness accuracy and quality. becomes easier. In addition, when the adjustment bar to be replaced is machined from a small diameter round bar, it is not only easy to replace, but also because it is originally small, the cost is low, leading to a reduction in equipment costs.

[Brief explanation of drawings]

FIG. 1 is a front view of an insert inserted into a composite adapter showing a typical embodiment of the present invention, FIG. 2 is a view in the direction of arrow A in FIG.
3 is a sectional view taken along line BB in FIG. 1, FIG. 4 is a sectional view taken along line C-C in FIG. 1, FIG. 5 is a sectional view taken along line DD in FIG. 3, and FIG. A cross-sectional view of the film obtained by the device, FIG. 7 is a schematic top view of the conventional composite molding device, and FIG. 8 is E in FIG.
-E sectional view, FIG. 9 is a FF sectional view in FIG. 8, FIG. 10 is a side view of an insert inserted into a conventional composite adapter, FIG. Figure 12 is H of Figure 11.
The arrow view, FIG. 13 is a J-J sectional view in FIG. 1O, and FIGS. 14 and 15 are 1-- in FIG.
1, and FIGS. 16 to 18 are different cross-sectional views of the laminate at the exit of the goo. Explanation of the main parts of the diagram 2A, 2B, 2C - Conduit 5 - Composite adapter row - Die (forming guide) 7 - Inserts 7A, 7B, 7G - Confluence channel 14 - Adjustment nut 15 - Pointer plate 16 - Scale plate 111A, IIIB, llIC, 1110--Adjustment bar-Fig. 3, Fig. 13, Fig. 14, Fig. 15B

Claims (1)

[Claims] It has an exchangeable insert in the center of the main body in which a flow path for merging a plurality of melts is formed, and the insert is provided between a conduit for guiding the plurality of melts and a molding die for laminating and molding each melt. ,
In a composite adapter for extrusion molding that communicates the conduit with the melt receiving port of the molding die, the lamination width and end lamination thickness of the laminated melt are adjusted in part or all of each confluence part of the flow path. Composite adapter for extrusion molding, characterized by incorporating an adjustment bar to obtain.