JPH0761672B2 - Composite adapter for extrusion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite adapter for extrusion molding that can be used in a multilayer film manufacturing apparatus and a multilayer sheet manufacturing apparatus.

(Prior Art) FIGS. 7 to 18 are disclosed in JP-A-59-220332 and JP-A-63-220332.
This is an example of a conventional device disclosed in Japanese Patent No. 13730, which is a composite adapter for three-layer extrusion.

In the figure, the melt supplied from the three extruders 1A, 1B, 1C is the flow path switching plate 4 by the conduits 2A, 2B, 2C and the adapter 3.
Be led up to. The flow path switching plate 4 has a die (molding die).
The upper layer, the middle layer, and the lower layer of the product extruded from 6 are provided with flow paths 4A, 4B, 4C that determine whether to bring the melt supplied from each extruder 1A, 1B, 1C, Its flow paths 4A, 4B,
4C is connected to the flow paths 3A, 3B, 3C of the adapter 3 and the flow paths 5A, 5B, 5C of the composite adapter 5 according to the layer structure. At the center of the composite adapter 5, an insert body 7 having merged channels 7A, 7B, 7C for stacking and merging the melts is fitted in parallel to the die 6 and at a right angle to the channel. It is fixed to the composite adapter 5 with packing 9 and nut 10.

10 to 13 are detailed views of the insert 7, the fixing plate 8, the packing 9, and the nut 10, and FIGS. 14 and 15 are sectional views taken along lines F to F of FIG. The cross-sectional shape of the merged channels 7A, 7B, and 7C at the merged portion is shown. Incidentally, FIG. 14 shows that the widths w ₁ , w ₂ , w ₃ of the respective merged channels 7A, 7B, 7C are different, and FIG. 15 shows the widths w ₁ , w ₂ , w of the respective merged channels 7A, 7B, 7C. ₃ shows the same thing, respectively.

Now, in the apparatus shown in FIGS. 7 to 15, each extruder 1A, 1B, 1C
The further extruded melt 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. Further, the flow path switching plate 4 is provided with flow paths 4A, 4B, 4C according to the required layer structure, and is connected to the flow paths 5A, 5B, 5C of the composite adapter 5, respectively, and the combined flow path 7A of the insert body 7 is formed. , 7B, 7C, the layers are joined together and extruded from the die 6 as a three-layer sheet or film.

By the way, when melts having different viscosities are laminated by such a conventional apparatus, uniform widths are not uniform at the exit of the die 6, and for example, as shown in FIG.
When 7A, 7B, and 7C have the same width, if the viscosity of the surface layer (melt of 7B and 7C) is lower than the viscosity of the center (melt of 7A), each laminate at the die exit should be It is known that, as shown in FIG. 16, the melts 7b, 7c in the surface layer wrap around at both ends and do not form a laminate having a uniform width.

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. The adjusting this sneak amount, in order to obtain a uniform laminate the entire width as FIG. 18 in the die outlet, FIG. 11 and 14 as shown in FIG, merging portion of the channel width w _2, w It is known to make ₃ smaller than the central channel width w ₁ .

(Problems to be Solved by the Invention) However, as described above, when the flow path widths w ₂ and w ₃ are made smaller than w ₁ , the adjusting bars 11A, 11B, 11C or 11D are connected to the merging section flow path.
Adjustment bar 11A, 11B, 11 for inserting and adjusting in 7B or 7C
The melt is blocked by C or 11D, the melt stays, and the flow path in the downstream part of the adjusting bars 11A to 11D
Since a stagnation portion similarly occurs between the melt of 7A and the confluence (7X and 7Y in FIG. 13), there is a drawback that the melt is burnt and the laminar flow is disturbed during lamination.

As described above, in the conventional composite adapter, the adjusting bar is adjusted by inserting the adjusting bar into the flow path to adjust the flow path width of the merging portion.
There was a defect that stagnation points were generated before and after ~ 11D, causing thermal deterioration of the melt and turbulence of the flow at the time of merging (7X and 7Y parts in Fig. 13). At the same time, the melt is completely blocked in the adjusting bar insertion part, and the film (or sheet) extruded from the die
However, there was a problem that the surface layer portion was not laminated at all and a portion where the melt 7a in the inner layer protruded was generated (FIG. 17).

In order to solve the above-mentioned conventional problems, the present invention makes it possible to change the width of the surface layer channel and at the same time make it possible to adjust the laminated thickness during operation without completely cutting off both ends of the surface layer channel, and melting An object of the present invention is to provide a composite adapter for extrusion molding which eliminates thermal deterioration of products and turbulence of flow and has good thickness accuracy of each layer over the entire width of the film.

(Means for Solving the Problem) Therefore, the present invention is provided between a conduit for guiding a plurality of melts and a molding die for molding the melts, and the conduit and a melt inlet of the molding die. In the extrusion-molding composite adapter that communicates with each other, a replaceable insert is provided at the center of the adapter, and a plurality of flow paths are formed by combining the insert and the inserted body, and at the same time, the flow path tip is formed. The outer layer thickness gap at both ends of the joint (merging part) can be adjusted during the molding operation by rotating the adjusting valve that is coaxially inserted into the fixed flow path body, and the gap between the adjusting valve and the insert body can be kept constant. A control valve with a shape that does not allow the molten material to stay is provided, and the flow path at the central part excluding the control valve can be changed in the thickness gap of the flow path tip (merging portion) by replacing the fixed flow path body. The contact part with the insert is coaxial with the adjusting valve. A rod-shaped object having the same diameter is provided, and this is used as a means for solving the problem.

(Operation) By making it possible to change the flow path gap at the confluence part and adjust the amount of lamination at both ends, the thickness accuracy of both ends of the film (or sheet) is improved and the outer layer side of both ends is improved. It is possible to prevent the resin from wrapping around and the resin on the inner layer side from protruding. In addition, the control valve has a shape that can be adjusted during the molding operation and that does not retain the melt, and the rotation angle is limited to a range that does not completely block the flow path, so that the retention of the melt is eliminated and the flow at both ends is eliminated. By eliminating the irregularity of the film, it is possible to improve the thickness accuracy of the ear portion of the film (or sheet).

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an insert showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line G--H of FIG. 1, FIG. 4 is a sectional view taken along line I--I of FIG. 1, and FIG. 5 is a state in which the flow rate adjusting valve of FIG. 4 is rotated. Indicates. As is apparent from the drawings, the present invention shows the flow path members 111A, 111 provided in the combined flow path portion of the insert body 107 and the composite adapter 5 to be inserted into the insertion hole of the composite adapter 5.
B and the flow rate adjusting valves 112A to 112D are characterized.

Now, in the insert body 107, as shown in FIG.
The channels 107A, 107B, 107C to be processed into all have the same width w ₁ as in the conventional case, but the composite adapter 5 is used to prevent retention.
A semicircular flow path slightly larger than the outer diameter of the adjusting valves 112A to 112D inserted into the valve is processed (Figs. 4 and 5).
Figure). Further, as shown in FIG. 3, the wall surface 5'of the insertion hole of the composite adapter 5 and the wall surfaces 107B 'and 107C' of the flow path of the insert body 107 constitute the combined flow paths 107B "and 107C", respectively. A flow passage body 11 capable of exchanging a part of the flow passage wall face 5'of the composite adapter 5 facing the wall faces 107B ', 107C' of the joint flow passages 107B ", 107C".
Formed by 1A and 111B. In this way, the combined channel 107B ″, 107C ″
In the flow passage bodies 111A and 111B that form the flow passage wall faces 111A ′ and 111B ′ on the composite adapter side, the wall faces 111A ′ and 111B ′ that become the flow passages are inserted into the round bar having the same outer diameter as the adjustment valves 112A to 112D. Processed in a range shorter than the flow path width w ₁ between the bodies 107, and the fixing flange
Insert into the composite adapter 5 through 108, 108 ', and press the key 13
It is stopped by A and 13B.

Further, the flow passage wall surfaces 111A ′ and 111B ′ of the flow passage members 111A and 111B are processed into a shape having no step with the wall surface 5 ′ of the composite adapter 5. On the other hand, the flow rate adjusting valves 112A, 112B, 112C, 112
D is the fixed channel body 111A, 111B of the joint channel 107B ″, 107C ″
The fixed flow path body is provided to adjust the flow path gaps of the flow path portions w ₅ and w ₆ except the flow path widths w ₂ and w ₃ provided in the fixed flow path body.
Wall surfaces 112A ′, 112, which are made of a cylindrical material having the same outer diameter as 111A, 111B, and which constitute one of the flow paths in the flow path widths w ₅ , w ₆
C '(112B', 112D ') is processed. Further, the adjusting valves 112A to 112D are coaxially inserted in the small-diameter portions 112A-1, 112C-1 (112B-1, 112D-1) of the fixed flow path bodies 111A, 111B, and can be freely operated from outside the composite adapter during operation. It is rotatably provided, and a spanner hook 14 and a scale reference line 15 are provided at a portion outside the flange 108 so that the adjustment amount of the valve can be confirmed.
17 indicates a scale.

By the way, as mentioned above, the conventional composite adapter is shown in FIG.
As shown in FIG. 15, since only the widths w ₂ and w ₃ of the outer layer side channel are adjusted, there is generation of a thermal deterioration product due to retention during film (or sheet) molding, Cleaning was needed. In addition, if there is a disorder in the laminated state or protrusion on the inner layer side, there is no countermeasure, and it is necessary to take measures such as reducing the insertion amount of the adjustment bar at the expense of the layer thickness accuracy of the ear portion of the film (or sheet). .

In the above-described embodiment of the present invention, the fixed flow path widths w ₂ and w ₃ are shaped so as not to accumulate, and the adjusting valves 112A to 112D are also provided.
The structure that can be adjusted within the range where there is no stagnation point prevents thermal deterioration due to stagnation and does not hinder the flow, so there is no disturbance in the lamination and the outer layer has the full width w ₁
Since it is laminated on the inner layer, the protrusion on the inner layer side can be completely prevented. Furthermore, when it is desired to change the ratio of the fixed flow path widths w ₂ and w ₃ and the adjustment flow path widths w ₅ and w ₆ , the fixed flow path bodies 111A and 111B and the adjustment valve 112 are used.
Since A, 112B, 112C, and 112D are provided so as to be easily exchangeable, it is sufficient to replace the fixed flow path body and the adjusting valve, and the work is easy.

(Effects of the Invention) Since the present invention is configured as described in detail above,
As in the prior art, there are no problems such as disorder of the laminated state of both ears of the film (or sheet), burnout due to protrusion and retention of the inner layer resin, and inconvenience in accuracy of layer thickness caused thereby. In addition, the fixed channel body can be replaced to adjust the thickness of the film (or sheet) and to change the large pattern,
To adjust both ears, operate the adjustment valve during driving,
It becomes easy to form a film (or sheet) with good thickness accuracy and quality. Further, the fixed flow path body and the adjusting valve to be replaced are small ones that are machined from a small-diameter round bar, so that the cost is low and the equipment cost is low. If a scale plate for checking the rotation angle of the adjusting valve is provided, workability and reproducibility can be further improved.

[Brief description of drawings]

FIG. 1 is a front 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 sectional view taken along line HH of FIG. 4 is a cross-sectional view taken along the line I-I of FIG. 1, FIG. 5 is a cross-sectional view of the flow rate control valve of FIG. 4 rotated, FIG. 6 is a view taken in the direction of arrow J of FIG. 1, and FIG. FIG. 8 is a schematic plan view of a general composite molding apparatus of FIG.
-A sectional view, FIG. 9 is a sectional view taken along line BB of FIG. 8, FIG. 10 is a side view of an insert body to be inserted into a conventional composite adapter, and FIG. 11 is a view taken in the direction of arrow C of FIG. Figure 12 is a view from the arrow D in Figure 11, Figure 13
FIG. 14 is a sectional view taken along line E-E of FIG. 10, FIG. 14 is a sectional view taken along line F-F of FIG. 13, and FIG. 15 is a sectional view taken along line F-F of FIG. FIGS. 16, 17, and 18 are different cross-sectional views of the stack at the die exit. Explanation of the main parts of the figure 2A, 2B, 2C …… Conduit 5 …… Composite adapter 6 …… Die (molding die) 17 …… Scale 107 …… Insert 111A, 111B …… Fixed channel body (rod) 112A , 112B, 112C, 112D ...... Flow rate adjustment valve

Claims (1)

[Claims] 1. A composite adapter for extrusion molding, which is provided between a conduit for guiding a plurality of melts and a molding die for molding the melt, and which connects the conduits with a melt inlet of the molding die. A replaceable insert is provided in the center of the adapter, and a plurality of flow paths are formed by combining the insert and the inserted body, and the outer layer thickness of both ends of the flow path tip (merging part) The gap can be adjusted during the molding operation by rotating the adjusting valve that is coaxially inserted into the fixed flow path body, and the gap between the adjusting valve and the insert body is fixed so that the melt does not stay. A valve is provided, and the central channel except for the adjusting valve is coaxial with the adjusting valve so that the thickness gap of the flow path tip (merging portion) can be changed by replacing the fixed channel body. It is characterized in that the contact part is provided with a rod-shaped object having the same diameter. Molding composite adapter out.