JPH0467932A - Laminating device for multi-layer extrusion molding machine - Google Patents

Abstract

PURPOSE:To make the thickness of a resin material on an intermediate layer in the width direction constant by setting a width adjusting device to be able to adjust the width dimension of the resin material in an inlet flow path for the intermediate layer out of respective inlet flow paths. CONSTITUTION:A bolt 10b is screwed in and fixed by a fixing plate 10c in the state of adjusting the rotating position preliminarily in a manner of forming the channel width corresponding to the MI (metal index) value of a resin raw material B in the position where a channel 10d of a first width adjusting device 10 faces a component 20c moving forward and backward. Similarly the rotating position of an end component 11a of another first width adjusting device 11 is adjusted so that its channel width corresponds to the MI value of a resin raw material C and fixed. The resin raw material B having large MI value passes through an inlet flow path 2b for a lower layer and the width of said resin raw material is adjusted to the given width by the first width adjusting device 10 and the material is fed into a laminating chamber 2d. A resin raw material C having comparatively large MI value passes through an inlet flow path 2c for an upper layer, and its width is adjusted by the first width adjusting device 11 to the given width and the material is fed into the laminating chamber 2d. As the thickness of respective layers is decided by the feeding amount per unit time, the respective feeding amount can be adjusted to the given thickness ratio.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a laminating device for a multilayer extrusion molding machine, and in particular, the thickness of the resin material of the intermediate layer is made constant in the width direction, and the thickness of the other layers is made constant. This relates to a new improvement for making the thickness constant.

[Prior art] Generally, an extrusion molding machine is equipped with a die having a wide opening to extrude molten resin into a thin plate, and then cooled.
A resin film or sheet is produced. In the production of resin sheets, etc., a multilayer extrusion molding machine is used to overlay and extrude resins and adhesives with different properties in order to improve adhesion to mating parts and gas permeability. It is being used as a material. For example, tofu containers are made from 1,000 tons of polyethylene (P), which has good deep drawing properties.
S) It is necessary to form the sheet into a box-shaped container with a rim, put tofu in this container, and seal it by thermally adhering a polypropyne (PP) film to the rim as a lid member. The heat adhesion is not good. For this purpose, first, an adhesive resin (hereinafter referred to as adhesive) is sandwiched between molten PS and PP and extruded simultaneously to produce a laminated sheet. Next, using this laminated sheet,
With PP on the inside, it is deep drawn into a box-shaped container with a rim.

Separately, prepare a PP film as a lid member. By bringing the edge of the box-shaped container containing tofu into contact with the lid member and applying heat, the PP surface of the container and the PP film surface of the lid member are thermally bonded, resulting in a good result. This enables multi-layer adhesion.

[Problem to be solved by the invention]

However, when draw forming is performed using a multi-layered sheet made by sandwiching an adhesive between PS and PP and extruding them simultaneously, there is a pressure point in which defective products such as deformation are likely to occur. There is. When such a multilayer sheet is observed, each layer has a predetermined thickness ratio at the ends of the sheet corresponding to both ends in the width direction of the die, as shown in Fig. 10, which is a cross section cut in a direction perpendicular to the extrusion direction. It can be seen that there are some parts that are not. When producing a multilayer sheet as described above, among the resin materials used, materials with a large melt index (MJ>, that is, materials with good fluidity tend to spread quickly in all directions during extrusion. As a result, M
Material It will be done. It is known that if such a sheet portion with a predetermined thickness ratio is deviated from the specified thickness ratio is drawn and formed, defects will occur. For this reason, it was necessary to cut and remove both end portions and supply only the portion having a predetermined thickness ratio as the sheet material, resulting in poor yield. In addition, as another conventional example, as shown in Fig. 11 and Fig. 12121, when multilayer molding is performed using resin materials with different MIs, q<x, Ml is 5, and Z's M T is 1), the MI value changes. The resin material NZ having a small value had a convex shape, and the resin material 1'4x having a large MI value had a concave shape.

Therefore, it is necessary to manufacture a multilayer sheet having a predetermined thickness ratio over the entire width, and the present invention was made to solve this problem. In addition to being constant in the width direction,
It is an object of the present invention to provide a laminating device for a multilayer extrusion molding machine in which the thickness of other layers is also constant.

[Means to solve the problem]

In the present invention, when manufacturing a multilayer sheet or a multilayer film, among the resin materials used, a material with a large MT can be formed to have a small width dimension of the flow path in the portion fed to the die. The above-mentioned problem is solved by providing a width adjusting device that can adjust the width dimension in the laminating device. That is, the laminating device of the multilayer extrusion molding machine according to the present invention is installed in a multilayer extrusion molding machine that overlays a plurality of resin materials and extrudes them as a multilayer resin sheet or a multilayer resin film, and the lamination device of the multilayer extrusion molding machine according to the present invention is installed in a multilayer extrusion molding machine that overlays a plurality of resin materials and extrudes them as a multilayer resin sheet or a multilayer resin film, and is provided with at least one layer in which the plurality of resin materials are separately supplied. In a laminating device for a multilayer extruder having three inlet channels and a laminating chamber in which the resin materials are stacked, an inlet channel for an intermediate layer among each of the inlet channels,
This configuration is provided with a width adjustment device that can adjust the width dimension of the resin material.

More specifically, the width adjusting device is provided in the lower layer entrance flow path and the upper layer entrance flow path among the respective entrance flow paths.

More specifically, the width adjustment device includes a cylindrical shaft member rotatably provided in the entrance flow path, and a groove whose width changes in a direction perpendicular to the axis on the inner peripheral surface of the shaft member. The structure consists of

More specifically, the width adjusting device includes at least one pair of valve members provided in the inlet flow path, and a screw device provided in each of the valve members for changing the flow path width between each of the valve members. This is the structure.

More specifically, the width adjustment device includes a first width adjustment device and a second width adjustment device, and the first width adjustment device includes a cylindrical shaft member rotatably provided in the inlet flow path;
The second width adjusting device includes a groove whose width changes in a direction perpendicular to the axis on the circumferential surface of the shaft member, and the second width adjusting device has a groove between at least a pair of valve members provided in the entrance flow path and each of the valve members. and a screw device provided on each of the valve members to change the width of the flow path, and the first width adjustment device and the second width adjustment device are selectively combined.

[For production]

In the laminating device of the multilayer extrusion molding machine according to the present invention, the molten sheet raw material extruded into a cylindrical shape for each material by each extruder is first introduced into each inlet channel of the laminating device. Here, the material with the smallest Ml is set as the maximum width, and the material with the larger MI is stacked in a strip shape with the width becoming narrower to form a "laminated material." The laminated material is then sent through an exit channel to a die where it is subjected to extrusion pressure.

Each layer spreads in all directions at a faster speed as the Ml increases, but the width of these layers is adjusted by a width adjustment device installed in the inlet flow path, and the upper layer becomes narrower as the Mr increases. Finally, a laminated sheet having a substantially uniform predetermined thickness ratio is extruded for both the intermediate layer and the lower layer.

〔Example〕

Hereinafter, preferred embodiments of the lamination device of the multilayer extrusion molding machine according to the present invention will be described in detail.

1 to 3 show a laminating apparatus for producing a three-layer sheet according to a first embodiment of the present invention. The main body 2 has a box shape, and has a total of three inlet channels 2a, 2c, and 2b for the middle layer, upper layer, and lower layer, and a laminated chamber 2 that is an outlet channel.
d is provided.

On the image side of the main body 2, a disk-shaped first side plate 4 and a second rI
! A J plate 6 is attached. Each channel 2a2b, 2c
The stacking chamber 2d communicating with the main body 2, the first side plate 4 and the second
It is formed by the rs plate 6.

A rectifier 8 for shaping the cylindrical molten resin into a flat plate shape is arranged on the upstream side of the lamination chamber 2d. First width adjustment device 10
is attached to the first side plate 4, and is connected to a shaft member 10. which will be described later. -1 further crosses the downstream side of the stacking chamber 2d,
21st I! It is fitted into a hole 6a provided in the II plate 6. The shaft member 10a of the first width adjustment device 10 is provided with a groove 10d on its circumferential surface in a direction perpendicular to the axis (see FIG. 4). This /1110 d is parallel '
Instead, as shown in the exploded view in FIG. 5, the shaft member 10
It has a shape that expands from width W1 to width Wo from 0 degrees to approximately 330 degrees on the circumference of point a. The shaft member 10a can be fixed to the first side plate 4 so as not to rotate by screwing the bolt 10b into the first side plate 4 through the fixing plate 10c. This allows the inlet channel 2 for the lower layer to
It is possible to adjust the second raw material B supplied to b to a predetermined raw material width and flow it into the stacking chamber 2d. A similar first width adjustment device 11 is attached to the second side plate 6 in the opposite direction to the first width adjustment device 10, and controls the second raw material C supplied to the upper layer inlet flow path 2c at a predetermined level. It is possible to adjust the width of the raw material and allow it to flow into the single chamber 2d. Main body 2
A flange 12 is provided on the stacking chamber 2d side with a dimension of f, and is connected to a flange 16 on the die side via a connecting pipe line 14. Lamination chamber 2d, flange 12
The flow path shapes of the connecting pipe line 14 and the flange 16 are rectangular as shown in FIG. In the main body 2,
In FIG. 1, a pair of advancing and retracting devices 18 and 20 are provided that penetrate through the stacking chamber 2d from the upper left and the lower left. The advancing/retracting device 18 is a push-pole screwed into the main body 2 with a through hole (not shown) provided in the center.
a, and a pull bolt 1.8 inserted into the through hole b
and a reciprocating member 18c attached to the pull bolt 18b.
It is composed of. The reciprocating member 18c has a shape in which a part of a prism is obliquely cut off, and the negative side thereof is connected to the shaft member 11a of the first width adjusting device 11, as shown in FIG.
It is designed to face the cylindrical surface of. Moving member 18c
Width dimension of the groove 10d facing the above-mentioned − surface (W1 to W,)
The width dimension of the third raw material C is determined by this.

Similarly, the advancing/retracting device 20 has a through hole in the center, and includes push bolts 1 to 20a screwed into the main body 2, a pull bolt 20b inserted into the through hole, and a pull bolt 1-18b.
It is composed of a reciprocating member 20C attached to the retractable member 20C. The reciprocating member 20c has the shape of a prism with part 3 cut off diagonally, and its - face faces the circular face of the shaft member 10a of the first width adjusting device 10. The width of the second original flB is determined by the width of the groove 10d facing the above-mentioned negative surface of the reciprocating member 20C.

The advancing/retracting devices 18 and 20 are advancing/retracting members], 8 c and 2
The first raw material A introduced into the stacking chamber 2d through the intermediate layer inlet channel 2a by moving the 0C forward and backward in the stacking chamber 2d in the direction toward or away from each other.
It is possible to change the flow rate. In addition, main body 2,
A heater 22 is attached to the side plate 4 and the second side plate 6.

Next, the operation of this first embodiment will be explained. Each inlet channel 2
Molten raw materials each having a circular cross section are supplied to a, 2b, and 2c from a plurality of extruders (not shown). The forming material t[ is maintained at a predetermined temperature by a heater 22. Here, the resin raw material A supplied to the entrance channel 2a for the intermediate layer is one with a small MI (for example, PP).
), and the resin thickness 1'4 B supplied to the inlet channel 2b for the lower layer has a large MI (for example, PS), and the resin supplied to the inlet channel 2c for the upper layer has a thickness of 1'4. Raw material C is one with relatively large Ml (for example, adhesive resin)
Suppose that 10 of the first width adjustment device 10 in advance.
With the rotational position adjusted so that the groove width corresponds to the MI value of the resin raw material B at the position where the bolt 1. Screw in the Ob and attach the fixing plate 10
Fix it by c. Similarly, another first width adjustment device 1
1, the rotational position of the shaft member 11a is adjusted and fixed so that the groove width corresponds to the MI value of the resin raw material C. The resin raw material B passes through the lower layer inlet channel 2b,
It is adjusted to a predetermined width by the first width adjustment device 10 and supplied to the stacking chamber 2d. After the resin raw material A with a small MI is rectified into a flat plate shape through the rectifier 8, there is no need to regulate the width dimension, so it is supplied to the lamination chamber 2d without passing through the width adjustment device. . The resin thickness nc passes through the upper layer inlet channel 2C, is adjusted to a predetermined width by the first width adjustment device 11, and is supplied to the lamination chamber 2d. Since the thickness of each layer is determined by the supply amount per unit time, each supply amount may be adjusted so as to achieve a predetermined thickness ratio. At this time, if there is a large difference in the flow velocity of each molten resin in the lamination chamber 2d, the thickness accuracy will be affected, so the flow velocity is adjusted using the advancement/retraction devices 18 and 20. In this way, as shown in FIG.
Resin raw material B for the lower layer, which is narrower in width d
.

The resin raw material A for the middle layer, which has the widest width, and the resin raw material C, for the upper layer, which has an intermediate width, are stacked in this order. This molten laminated material is led to a die (not shown) through the connecting pipe 14 and is pressed to a uniform thickness. In this way, an M-layer sheet or laminated film having a predetermined thickness ratio is manufactured.

Further, although the cross-sectional shape of ff1lOd has been described as being rectangular, it may be formed into a trapezoidal shape or the like.

In addition, a resin material with a large MI is supplied to the entrance channel 2a for the intermediate layer, and as shown in FIG.
By forming a minute gap A between aA and the shaft member 10a and rotating this shaft member 10a, the width of the groove 10d can be changed and made to be different from the width of the resin raw material A.

Next, FIG. 6 shows a second embodiment of the present invention. That is, the second width adjustment devices 30 and 31, which have a different configuration from the first width adjustment device 10.11 described above, include a fixing member 30a that is fixed to the first side plate 4 and the second m-plate 6, respectively, and supports the bolts 30b and 31b. and 31a, and a valve member 30 disposed within the laminated chamber 2d and connected to the bolts 30b and 31b, respectively.
Consisting of bolts 30b and 31c, bolts 30b and 31b
When the valve members 30c and 31c are rotated, the valve members 30c and 31c move in and out. The first side plate 4 and the second side plate 6 have through holes 30d and 31d for passing bolts 30b and 31b, and a valve member 30.
Recesses 3012 and 31e into which the recesses 3012 and 31c are fitted are provided. In this second embodiment, two sets of second width adjustment devices 30 and 31 are used to adjust the width dimension of the resin passage 1-).

The operation of this second embodiment will be explained. Bolts 30b and 3
lb to open valve members 30c and 31. The channel width W formed by the valve members 30c and 31c is adjusted by moving the grooves 30e and 3]c in the direction of ejecting or retracting the hollows 30e and 3]e. Other operations are similar to those described in the first embodiment.

Therefore, the second width adjustment device 30.31 of the second embodiment described above
The same effect as described above can be obtained not only in the above-mentioned intermediate layer entrance flow path 2a but also in the other entrance flow paths 2b and 2c, and the above-mentioned first width adjustment device 10, 11 and the second width adjusting device 30, 31 in selective combination, laminations of any resin material can be obtained.

Although this embodiment describes the case where there are at least three layers, it goes without saying that it can also be applied to cases where there are three or more layers.

[Effects of the Invention] As explained above, according to the present invention, the width of the material before being supplied to the tie can be adjusted freely across the middle layer, upper layer, and lower layer depending on the MI value of the resin material used. Therefore, the thickness ratio of laminated sheets, films, etc. can be kept constant.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a part of the laminating apparatus according to the first embodiment of the present invention in cross section, FIG. 2 is a sectional view taken along line H in FIG. 1, and FIG. ■The arrow view, Figure 4 is the first diagram of the present invention.
FIG. 5 is a perspective view of the shaft member used in the embodiment, FIG. 5 is a developed view of the shaft member used in the first embodiment of the present invention, and FIG. 6 is a vertical sectional view of the lamination device of the second embodiment of the present invention. 7 and 8 are configuration diagrams of essential parts showing other embodiments of the present invention, FIG. 9 is a sectional view of materials laminated according to the present invention, and numbers 1011 to 127 are diagrams of conventional laminated sheets. FIG. 2 is the main body, 2a is the inlet channel for the intermediate layer, 21] is the force inlet channel for the lower layer, 2c is the inlet channel for the upper part, 2d
Lt is a lamination chamber, 10 is a first width adjustment device 30 is a second @ adjustment device, 10a is a shaft member, ], Od is a groove, 30c, 31c
are the valve members 30a, 30b, 31a, 31b spring devices. Patent Applicant Japan Steel Works Co., Ltd. Representative Patent Attorney Terushi Zeng (Od) is Figure 3, Figure 5

Claims (5)

[Claims] (1) At least three inlets provided in a multilayer extrusion molding machine that superimposes a plurality of resin materials (A, B, and C) and extrudes them as a multilayer resin sheet or multilayer resin film, and into which the plurality of resin materials are separately fed. Channels (2a, 2b, 2c
) and a lamination chamber (2d) for overlapping the resin materials, the lamination device for a multilayer extrusion molding machine having an inlet flow path (2a) for intermediate layer among the respective entrance flow paths (2a, 2b, 2c). ) is provided with a width adjustment device (10 or 30) capable of adjusting the width dimension of the resin material (A). (2) Among the respective entrance channels (2a, 2b and 2c), the width adjusting device (10 or 30) is installed in the lower layer entrance channel (2b) and the upper layer entrance channel (2c). 2. A laminating device for a multilayer extrusion molding machine according to claim 1, further comprising: a laminating device for a multilayer extrusion molding machine. (3) The width adjusting device (10) includes the inlet flow path (2).
a, 2b, 2c), a cylindrical shaft member (10a) rotatably provided, and a groove (10d) whose width changes in a direction perpendicular to the axis on the circumferential surface of the shaft member (10a). A laminating device for a multilayer extrusion molding machine according to claim 1 or 2, characterized in that the laminating device comprises: (4) The width adjustment device (30) includes the inlet flow path (2).
a, 2b, 2c), and each of the valve members (30c, 31c).
) to change the flow path width (W) between each valve member (30c
, 31c) and a screw device (30a, 30b or 31a, 31b).
Or the lamination device of the multilayer extrusion molding machine according to 2. (5) The width adjustment device includes a first width adjustment device (10) and a second width adjustment device (30), and the first width adjustment device (10) is connected to the entrance channel (2a, 2b, 2c). It consists of a cylindrical shaft member (10a) rotatably provided in the shaft member (10a), and a groove (10d) whose width changes in the direction perpendicular to the axis on the circumferential surface of the shaft member (10a), and has a second width. Adjustment device (30
) is for changing the flow path width (W) between at least one pair of valve members (30c, 31c) provided in the inlet flow path (2a, 2b, 2c) and each of the valve members (30c, 31c). Consisting of a screw device (30a, 30b or 31a, 31b) provided on each valve member (30c, 31c),
The first width adjustment device (10) and the second width adjustment device (3)
3. The laminating device for a multilayer extruder according to claim 1 or 2, characterized in that the laminating device for a multilayer extruder is configured to selectively combine 0).