JPH0651335B2 - Laminating device for multi-layer extrusion machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminating apparatus for a multilayer extrusion molding machine.

(B) Conventional technology By attaching a die with a wide opening to an extrusion molding machine, extruding molten resin into a thin plate shape, and cooling it,
A resin film or sheet is manufactured. In the production of resin sheets, etc., in order to improve the adhesiveness with the mating member and to improve the gas permeability, a multi-layer extrusion molding machine is used to extrude resin and adhesive with different properties And that is being done. For example, containers of tofu, such as polystyrene (P
S) The sheet is formed into a box-shaped container with a rim, tofu is put in this container, and polypropylene (PP) film is required to be heat-bonded to the rim of the container as a lid member to be hermetically sealed. So the heat adhesion is not good. Therefore, an adhesive resin (hereinafter referred to as an adhesive) is sandwiched between PS and PP in a molten state in advance and simultaneously extruded to manufacture a laminated sheet. Next, using this laminated sheet, deep drawing is carried out into a box-shaped container with an edge with PP inside. Separately, a PP film that is a lid member is prepared. By contacting the edge surface of the box-shaped container containing the tofu with the lid member and applying heat, the PP surface of the container,
The PP film surface of the lid member is heat-bonded, and good bonding is possible.

(C) Problems to be Solved by the Invention However, when a multilayer sheet in which an adhesive is sandwiched between PS and PP as described above and extruded at the same time is used for draw forming, defective products such as deformation may appear. There is a problem that it is easy. When such a multilayer sheet is observed, as shown in FIG. 7 which shows a cross section cut in a direction perpendicular to the extrusion direction, each layer has a predetermined thickness ratio at the sheet end portions corresponding to both ends in the width direction of the die. You can see that there is a part that is not. In the case of manufacturing the above-mentioned multilayer sheet, among the resin materials used, a material having a larger melt index (MI), that is, a material having a better fluidity is more likely to be spread in all directions quickly during extrusion. As a result, the material X having a large MI spreads quickly to the end portion in the width direction, and the material Z having a small MI is wound while the layer of the adhesive Y is rolled up.
Since it wraps around to the side, it is considered that the cross-sectional shape is as shown in the above figure. It has been found that when a sheet portion out of such a predetermined thickness ratio is used for drawing, a defect occurs. Therefore, both end portions must be cut and removed, and only the portion having a predetermined thickness ratio must be supplied as a sheet material, resulting in poor yield. Therefore, it has been required to produce multilayer sheets having a predetermined thickness ratio across the width.

A solution to this problem is disclosed in Japanese Patent Laid-Open No. 59-48137.
As disclosed in Japanese Patent Laid-Open Publication No. 2005-242242, it is conceivable to change the dimension of the extruded material in the width direction by moving the pair of adjusting members so as to approach each other or move away from each other. However, in such a configuration, since it is necessary to move the pair of adjusting members respectively to adjust the width dimension, the number of members configuring the device increases, and not only the cost of the device increases, but also Since it is necessary to operate each pair of adjusting members, there is a problem that the operation is troublesome.

The present invention aims to solve such problems.

(D) Means for Solving the Problems The present invention solves the above problems by making it possible to adjust the width dimension of the material supplied to the die only by operating one member. That is, the laminating apparatus of the present invention is provided in a multilayer extrusion molding machine in which a plurality of resin materials (A, B and C) are superposed and extruded as a multilayer resin sheet or a multilayer resin film, and the plurality of resin materials are separately supplied. A plurality of inlet channels (2a, 2b and 2c), a laminating chamber (2e) for superposing these resin materials, and an outlet channel (2d) for delivering the superposed resin materials,
For the case where a width adjusting device (10, 11) capable of adjusting the width dimension of the resin material (B or C) is provided between the inlet channel (2b or 2c) and the laminating chamber (2e). The width adjusting device (10 or 11) includes a columnar shaft member (10a) provided between the inlet channel (2b or 2c) and the laminating chamber (2e), and a fixing member attached to the shaft member (10a). A bolt (10) for fixing the rotational position of the shaft member (10a) via the plate (10c) and the fixing plate (10c).
b) and the shaft member (10a) has a groove (10) whose width gradually changes in the circumferential surface in a direction orthogonal to the axis.
d) is provided. The reference numerals in parentheses indicate the corresponding members of the embodiment.

(E) Action The molten sheet material extruded into a cylindrical shape for each material by each extruder is first introduced into the inlet channel of the laminating apparatus. Here, the material having the smallest MI is set as the maximum width, and the material having the larger MI has a narrower width and is stacked in a band shape to form a laminated material. Next, the laminated material is sent to the die through the outlet channel and subjected to extrusion pressure. Each layer spreads in four directions at a higher speed as the MI increases, but these widths become narrower as the MI increases, so that a laminated sheet having a substantially uniform predetermined thickness ratio is finally extruded. To be done. The width dimension of the material can be easily changed by simply rotating one shaft member at a desired angle.

(F) Example FIGS. 1 to 3 show a laminating apparatus for producing a three-layer sheet according to an example of the present invention. The main body 2 has a substantially box shape and is provided with three inlet channels 2a, 2b and 2c and one outlet channel 2d. Disc-shaped first side plates 4 and second side plates 6 are attached to both side surfaces of the main body 2.
Laminating chamber 2e communicating with each flow path 2a, 2b, 2c and 2d
Is formed by the main body 2, the first side plate 4 and the second side plate 6. A rectifier 8 that arranges a cylindrical molten resin into a flat plate shape is arranged on the upstream side of the laminating chamber 2e. The first width adjusting device 10 is attached to the first side plate 4, and a shaft member 10a described later further crosses the downstream side of the laminating chamber 2e and is fitted into a hole 6a provided in the second side plate 6. There is. The shaft member 10a of the first width adjusting device 10 is provided with a groove 10d on its circumferential surface in a direction orthogonal to the axis (see FIG. 4). The groove 10d is not parallel, but as shown in a developed view in FIG. 5, has a shape in which it is reduced from the width V to the width W over the circumference of the shaft member 10a from 0 degree to almost 330 degrees. The shaft member 10a is a fixed plate 10c.
By screwing the bolt 10b into the first side plate 4 via the, it can be fixed to the first side plate 4 so as not to rotate. Thereby, the second raw material B supplied to the second inlet channel 2b can be adjusted to have a predetermined raw material width and flow into the laminating chamber 2e. Similar second width adjusting device 11
Is attached to the second side plate 6 in the direction opposite to the first width adjusting device 10 and is supplied to the third inlet channel 2c.
The raw material C can be adjusted to have a predetermined raw material width and flow into the laminating chamber 2e. The flange 12 is attached to the outlet flow path 2d side of the main body 2, and the connection conduit 14
And is connected to the flange 16 on the die side. The cross-sectional shape of the flow path of the outlet flow path 2d, the flange 12, the connecting pipeline 14 and the flange 16 is formed in a rectangular shape as shown in FIG. In the main body 2, in FIG.
A pair of advancing and retracting devices 18 and 20 penetrating from the upper left and the lower left to the stacking chamber 2e are provided. The advancing / retreating device 18 has a through hole provided in the center thereof and is pushed into the main body 2 by a pushing bolt 18a, a pulling bolt 18b inserted into the through hole, and a retracting member 18c attached to the pulling bolt 18b. It consists of The advancing / retreating member 18c has a shape in which a part of a prism is cut off obliquely, and one surface thereof faces the cylindrical surface of the shaft member 11a of the second width adjusting device 11 as shown in FIG. It has become. Groove 11 facing the one surface of the advancing / retreating member 18c.
The width dimension of the third raw material C is determined by the width dimension (V to W) of d. Similarly, the advancing / retreating device 20 has a through hole at the center and is pushed into the main body 2 by the push bolt 20.
a, a pull bolt 20b inserted into the through hole,
It is composed of an advancing / retreating member 20c attached to the pull bolt 18b. The advancing / retreating member 20c has a shape in which a part of a prism is cut off obliquely, and one surface of this is the first
The width adjusting device 10 faces the cylindrical surface of the shaft member 10a. The width dimension of the second raw material B is determined by the width dimension of the groove 10d facing the one surface of the advancing / retreating member 20c. The advancing / retreating devices 18 and 20 are the advancing / retreating members 1
By advancing and retracting 8c and 20c in a direction in which they approach each other or away from each other in the stacking chamber 2e,
It is possible to change the flow rate of the first raw material A introduced into the laminating chamber 2e via the first inlet channel 2a. The main body 2, the first side plate 4 and the second side plate 6 are each provided with a heater 2
2 is attached.

Next, the operation of this embodiment will be described. Each inlet channel 2a,
Molding raw materials each having a circular cross section are supplied in a molten state to a plurality of extruders (not shown) to 2b and 2c.
The forming raw material is maintained at a predetermined temperature by the heater 22. Here, the resin raw material A supplied to the first inlet channel 2a has a small MI (for example, PP),
The resin raw material B supplied to the second inlet channel 2b is MI
Is large (for example, PS), and the resin raw material C supplied to the third inlet channel 2c is assumed to have a relatively large MI (for example, adhesive resin). In advance, the groove 10d of the first width adjusting device 10 is the advancing / retreating member 20c.
The bolt 10b is screwed in and fixed by the fixing plate 10c in a state where the rotational position is adjusted so that the groove width corresponds to the MI value of the resin raw material B at the position facing with. Similarly, also in the second width adjusting device 11, the shaft member 11 has a groove width corresponding to the MI value of the resin raw material C.
Adjust the rotation position of a and fix it. The resin raw material B passes through the second inlet channel 2b, is adjusted to have a predetermined width by the first width adjusting device 10, and is supplied to the laminating chamber 2e. MI
Since the resin raw material A having a small size does not have to be regulated in width after being rectified into a flat plate shape through the rectifier 8, it is supplied to the laminating chamber 2e without passing through the width adjusting device. The resin raw material C passes through the third inlet channel 2c and passes through the second width adjusting device 11
Is adjusted to have a predetermined width and supplied to the laminating chamber 2e. Since the thickness of each layer is determined by the supply amount per unit time, the supply amount of each layer may be adjusted so as to obtain a predetermined thickness ratio. At this time, the laminating chamber 2 for each molten resin
If the flow velocities in e are too different, the thickness accuracy is affected, so the advancing / retreating devices 18 and 20 are used to adjust the flow velocities. Thus, as shown in FIG. 6, the three kinds of resins are stacked in the laminating chamber 2e in the order of the resin material B having the narrowest width, the resin material A having the widest width, and the resin material C having the intermediate width. Will be done. This laminated material in the molten state is guided to a die (not shown) through the connecting conduit 14 and is given an extrusion pressure. By this extrusion pressure, each layer is adjusted in four directions at a speed according to the magnitude of MI. Thus, as shown in FIG. 6, the three kinds of resins are stacked in the laminating chamber 2e in the order of the resin material B having the narrowest width, the resin material A having the widest width, and the resin material C having the intermediate width. Will be done. This laminated material in the molten state is guided to a die (not shown) through the connecting conduit 14 and is given an extrusion pressure. By this pushing pressure, each layer is pushed and spread in all directions at a speed according to the magnitude of MI, so that the pushing width is finally made equal. In this way, a laminated sheet or laminated film having a predetermined thickness ratio is manufactured.

(G) Effect of the Invention As described above, according to the present invention, the width of the material before being supplied to the die can be freely adjusted by a simple operation according to the MI value of the resin material used. Therefore, the thickness ratio of the laminated sheets or films can be easily made constant. Since the number of members constituting the device is small, the cost of the device can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a partial cross section of a laminating apparatus of an embodiment of the present invention, FIG. 2 is a cross sectional view taken along line II-II of FIG.
FIG. 3 is a view on arrow III in FIG. 2, FIG. 4 is a perspective view of a shaft member used in an embodiment of the present invention, FIG. 5 is a developed view of a groove used in an embodiment of the present invention, and FIG. FIG. 7 is a sectional view of laminated materials, and FIG. 7 is a sectional view of a conventional laminated sheet. 4 ... 1st side plate, 6 ... 2nd side plate, 10, 11 ... Width adjustment device, 10a ... Shaft member, 10b ... Bolt, 10c
...... Fixing plate, 10d ...... Groove, A, B, C ... Resin material.

Claims (1)

[Claims] 1. A plurality of inlets provided in a multi-layer extrusion molding machine for extruding a plurality of resin materials (A, B and C) as a multi-layer resin sheet or a multi-layer resin film, and supplying a plurality of resin materials separately. Channels (2a, 2b and 2c)
And a laminating chamber (2e) for laminating these resin materials
And an outlet flow path (2d) for sending out the superposed resin material
And a width adjusting device (10, 11) capable of adjusting the width dimension of the resin material (B or C) is provided between the inlet channel (2b or 2c) and the laminating chamber (2e). In the laminating apparatus of the multilayer extrusion molding machine, the width adjusting device (10 or 11) is a cylindrical shaft member provided between the inlet channel (2b or 2c) and the laminating chamber (2e). (10a), a fixing plate (10c) attached thereto, and a bolt (10b) for fixing the rotational position of the shaft member (10a) via the fixing plate (10c).
The shaft member (10a) has a groove (10d) whose width gradually changes in a direction orthogonal to the axis on the circumferential surface.
A laminating apparatus for a multi-layer extrusion molding machine, comprising: