JPH0638659Y2 - Laminating device for multi-layer extrusion machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a laminating apparatus for a multi-layer extrusion molding machine, and in particular, by changing the resin passage cross section of the intermediate layer, the thickness is made constant in the width direction. , A new improvement for keeping the thickness of other layers constant.

[Conventional technology]

There are various types of laminating apparatus that have been conventionally used, but a typical one will be described. First of all, the actual device is shown in FIGS.
The configuration disclosed in the publication can be mentioned.

That is, what is indicated by reference numeral 2 in FIG. 11 is a main body, and the first inlet passage 2a, the second inlet passage 2b and the third inlet passage 2c formed in the main body 2 are provided in the stacking chamber 2d. A flow rate adjusting piece 101, which is formed in communication with each other and is movable back and forth by a bolt 100, is provided in each of the flow paths 2b and 2c, and the flow rate of the resin is adjusted.

In addition, as another conventional example, as shown in FIG.
A vane 200 that can reciprocate in the direction indicated by the arrow is provided between the inlet flow passage 2a and each of the other flow passages 2b and 2c, and a pair of distributors 300 is provided at the inlet side of the stacking chamber 2d, and each flow passage is provided. The flow path gap of the resin flowing through the paths 2b and 2c is adjusted.

[Problems to be solved by the device]

Since the conventional stacking device is configured as described above,
The following issues existed.

That is, in the above-mentioned structure, various resins having different viscosities, for example, resin B, are mixed with MI (melt index) = 5
If resin A having MI = 1 is used and the thickness of each layer is formed by combining the inner and outer layers of the multi-layer film sheet, the intermediate layers are not controlled, resulting in Figs. 12A and 12B. The intermediate layer was convex or concave.

Even if the outer layer is adjusted with a flow rate adjusting piece or distribution pin in the above-mentioned state, or the flow path gap of each layer is adjusted with a vane, the thick film adjustment of each layer cannot be sufficiently achieved, and a uniform thickness is not achieved. Obtaining a multilayer sheet film has been extremely difficult.

The present invention has been made to solve the above problems, and in particular, by changing the resin passage cross section of the intermediate layer, the thickness is made constant in the width direction, and the thickness of other layers is also made constant. It is an object of the present invention to provide a laminating device for a multilayer extrusion molding machine.

[Means for Solving the Problems]

The multi-layer extrusion molding machine laminating apparatus according to the present invention is provided in a multi-layer extrusion molding machine for stacking a plurality of resin materials and extruding the resin materials as a multi-layer resin sheet or a multi-layer resin film. In a laminating apparatus of a multi-layer extruder having a main body having second and third inlet passages and a laminating chamber provided in the main body for superimposing the resin material, an overall shape provided in the first inlet passage Is a long prism and has a pair of advancing / retreating devices having a pair of advancing / retreating members capable of advancing / retreating in the longitudinal direction, and a groove for making the resin material provided in the main body a predetermined width to be supplied to the second inlet channel. A first width adjusting device comprising a shaft member having
A second width adjusting device including a shaft member having a groove for making the resin material provided in the main body and supplied to the third inlet channel a predetermined width, and the resin material formed on the facing surface of each advancing / retreating member. Is provided with a notch recess formed in the same direction as the flowing direction, by the advancing and retracting of the advancing and retracting member along the longitudinal direction, the facing surfaces are separated, slightly opened and fully opened due to abutting and contacting, a little. By adopting either the closed state or the fully closed state, the resin passage cross section of the first inlet channel is continuously changed via the notch recesses.

[Action]

In the stacking device of the multi-layer extrusion molding machine according to the present invention, since the notch recesses are formed in the facing surfaces of the advancing / retreating members of the pair of advancing / retreating devices provided in the first inlet channel of the intermediate layer, the advancing / retreating members are formed. The shape of the resin passage cross section formed by each notch can be variously changed depending on the advancing / retreating condition, and the thickness of the intermediate layer can be made uniform by controlling the resin flow rate.

〔Example〕

Hereinafter, a preferred embodiment of the laminating apparatus of the multi-layer extruder according to the present invention will be described in detail.

1 to 10 show a laminating apparatus for manufacturing a three-layer sheet according to a first embodiment of the present invention. The main body 2 has a substantially box shape, and includes a total of three first, second, and third inlet channels 2a, 2c and 2b for the intermediate layer, the upper layer, and the lower layer, and the outlet channel. A stacking chamber 2d is provided. Disc-shaped first side plates 4 and second side plates 6 are attached to both side surfaces of the main body 2. The stacking chamber 2d that communicates with each of the flow paths 2a, 2b, 2c is formed by the main body 2, the first side plate 4, and the second side plate 6. A rectifier 8 for arranging the cylindrical molten resin into a flat plate shape is arranged on the upstream side of the laminating chamber 2d. The first width adjusting device 10 is attached to the first side plate 4, and a shaft member 10a described later is further inserted across a downstream side of the laminating chamber 2d 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 the circumferential surface thereof in a direction orthogonal to the axis (see FIG. 4). The groove 10d is shaped to expand not in parallel, the width W ₁ over substantially 330 degrees from 0 degrees on the circumference of the shaft member 10a as shown as an exploded view in FIG. 5 to the width W _n. Shaft member 10
The a 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 via the fixing plate 10c. As a result, the second raw material B supplied to the inlet flow passage 2b for the lower layer can be adjusted to have a predetermined raw material width and flow into the laminating chamber 2d. A similar second width adjusting device 11 is attached to the second side plate 6 in a direction opposite to that of the first width adjusting device 10, and the second raw material C supplied to the upper layer inlet flow channel 2c is supplied in a predetermined direction. Adjusting to the width of raw material, stacking room 2d
Can be made to flow into. A flange 12 is attached to the stacking chamber 2d side of the main body 2, and is connected to a flange 16 on the die side via a connection conduit 14. The flow path shape of the stacking chamber 2d, the flange 12, the connecting conduit 14 and the flange 16 is formed in a rectangular shape as shown in FIG. The main body 2 is provided with a pair of advancing and retracting devices 18 and 20 in the form of a long prism that penetrates from the upper left and the lower left in FIG. 1 to the stacking chamber 2d. Advance device 18
Is a push bolt 18a having a through hole (not shown) at its center and screwed into the main body 2, a pull bolt 18b inserted into the through hole, and a retractable member 18c attached to the pull bolt 18b. It consists of and. Advancing / retreating member 18c
Has a shape in which a part of the prism is cut off diagonally,
As shown in FIG. 1, this one surface faces the cylindrical surface of the shaft member 11a of the third width adjusting device 11. Width dimension of the groove 10d facing the one surface of the advancing / retreating member 18c (W _{1 to} W _n ).
Thus, the width dimension of the third raw material C is determined.
Similarly, the advancing / retreating device 20 has a through hole at the center,
It is composed of a push bolt 20a screwed in, a pull bolt 20b inserted into the through hole, and 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 thereof faces the cylindrical surface of the shaft member 10a of the first width adjusting device 10. 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 18c.
By advancing and retracting 20c and 20c in a direction toward each other or away from each other in the laminating chamber 2d, it is possible to change the flow rate of the first raw material A introduced into the laminating chamber 2d through the inlet channel 2a for the intermediate layer. is there. A heater 22 is attached to the main body 2, the first side plate 4, and the second side plate 6.

Further, as shown in FIG. 7, notch recesses 50 that open in the same direction as the resin flow direction are formed in the facing surfaces 18cA, 20cA of the advancing / retreating members 18c, 20c, respectively.
When advancing and retracting 18c, 20c, the respective facing surfaces 18cA, 20cA, as seen from the direction of arrow B in FIG. 6, show the facing surfaces (18cA, 20cA) with respect to each other as shown in FIGS. 8 to 10. It is possible to continuously and arbitrarily set the state of full open by separating, slightly approaching and abutting, slightly closed, fully closed, and the like.

Next, the operation of the above-described embodiment will be described.

A resin material having a circular cross section is supplied to each of the inlet channels 2a, 2b, 2c in a molten state from a plurality of extruders (not shown). The resin material is maintained at a predetermined temperature by the heater 22. Here, the resin raw material A supplied to the first inlet channel 2a for the intermediate layer has a small MI (eg PP).
The resin raw material B supplied to the lower layer inlet channel 2b has a large MI (eg PS), and the resin raw material C supplied to the upper layer inlet channel 2c is MI. It is assumed that it is a relatively large one (for example, an adhesive resin). At the position where the groove 10d of the first width adjusting device 10 faces the advancing / retreating member 20c in advance, the bolt 10b is screwed and fixed while the rotational position is adjusted so that the groove width corresponds to the MI value of the resin raw material B. It is fixed by the plate 10c. Similarly, the other second
The width of the groove (not shown) of the width adjusting device 11 is also the resin raw material C.
The rotation position of the shaft member 11a is adjusted and fixed so that the shaft member 11a has a value corresponding to the MI value. The resin raw material B passes through the inlet channel 2b for the lower layer, is adjusted to have a predetermined width by the first width adjusting device 10, and is supplied to the laminating chamber 2d. The resin material A having a small MI is supplied to the laminating chamber 2d without passing through the width adjusting device because it is not necessary to regulate the width dimension after being rectified into a flat plate shape through the rectifier 8. The resin raw material C passes through the inlet channel 2c for the upper layer, is adjusted to have a predetermined width by the second width adjusting device 11, and is supplied to the laminating chamber 2d. 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, if there is too much difference in the flow velocity in the laminating chamber 2d of each molten resin, since it affects the thickness accuracy, the flow velocity is adjusted by using the advancing and retracting devices 18 and 20, but at this time, the resin Each advancing / retreating member 18c, 20c depending on the state, type, etc.
By changing the advancing / retreating state of Fig. 8 to Fig. 10 arbitrarily, by changing the shape of the resin passage cross section of the first inlet channel 2a, the flow rate changes and the thickness of the intermediate layer becomes uniform. Can be measured. That is, when each of the advancing / retreating members 18c, 20c is in the fully opened state of FIG. 8, the shape of the intermediate layer made of the resin A is such that the center is swollen and both ends thereof are formed, and in the slightly opened state of FIG. The central part is bulged and both ends thereof are slightly left, and in the fully closed state of FIG. 10, only the part corresponding to each notch recess 50 in the central part is formed. Therefore,
In order to prevent the thickness of the intermediate layer from becoming uneven as shown in FIG. 12 and FIG. 12B when the resin raw material A used for this intermediate layer is formed into three layers, the MI characteristic of the resin raw material A is used in advance to prevent unevenness. As shown in FIGS. 8 to 10, the shape of the resin raw material A passing therethrough is changed by using the notch concave portion 50, so that the 12A
It is possible to obtain an intermediate layer which is flat and has a constant thickness in the width direction so as not to have the shapes shown in FIGS. For example, when the thickness (amount) of both ends of this intermediate layer is reduced, the relation between the first dimension x in the notch recess 50 shown in FIG. 8 and the second dimension y between the both ends is y <x. The thickness (amount) of both ends of the intermediate layer can be reduced. In this way, the three types of resins are the resin raw material B for the narrowest lower layer, the resin raw material A for the widest intermediate layer and the resin raw material for the upper layer of the intermediate width in the laminating chamber 2d. It will be superposed in the order of C. The laminated material in the molten state is guided to a die (not shown) through the connecting conduit 14 and pressed with a uniform thickness. In this way, a laminated sheet or laminated film having a predetermined thickness ratio can be manufactured.

It should be noted that the above-mentioned embodiment describes three layers, but it goes without saying that the present invention can be applied to the case of three or more layers.

[Effect of device]

Since the laminating apparatus of the multi-layer extrusion molding machine according to the present invention is configured as described above, the following effects can be obtained. That is, since the shape of the resin passage cross section of the intermediate layer is variously changed through the notch recesses formed in the facing surfaces of the advancing / retreating members of the pair of advancing / retreating devices, the die depends on the value of MI of the resin material used. Since the width of the material before feeding can be freely adjusted over the intermediate layer, the upper layer, and the lower layer, the thickness ratio of the laminated sheets or films can be made constant.

[Brief description of drawings]

FIG. 1 is a front view showing a part of the stacking apparatus of the embodiment of the present invention in section, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is III in FIG. FIG. 4 is a perspective view of the shaft member, FIG. 5 is a developed view of the groove, FIG. 6 is a schematic configuration diagram showing each flow path, and FIG. 7 is a perspective view showing the advancing / retreating member. FIG. 10 to FIG. 10 are configuration diagrams showing a change state of each advancing / retreating member, FIGS. 11 to 13 show a conventional configuration, FIG. 11 is a schematic configuration diagram showing each flow path, and FIG. 11 is a sectional view showing a multilayer sheet, and FIG. 13 is a schematic configuration diagram of a flow path showing another conventional example. 2 is a main body, 2a is a first inlet channel for the intermediate layer, 2b is a second inlet channel for the lower layer, 2c is a third inlet channel for the upper layer,
2d is a laminating chamber, 10 is a first width adjusting device, 11 is a second width adjusting device, 18 and 20 are advancing and retracting devices, 18c and 20c are advancing and retracting members, 18cA and 20cA.
Is a facing surface, and 50 is a notched recess.

Claims (1)

[Scope of utility model registration request] 1. A multi-layer extrusion molding machine in which a plurality of resin materials (A, B and C) are superposed and extruded as a multi-layer resin sheet or a multi-layer resin film, and the plurality of resin materials are separately supplied. , 2nd, 3rd inlet channel (2
a, 2b, 2c) having a main body (2) and a laminating chamber (2d) provided in the main body (2) for superimposing the resin material, wherein the first inlet flow A pair of advancing / retreating devices (18,20) having a pair of advancing / retreating members (18c, 20c) provided in the path (2a) and having a rectangular prism shape as a whole and capable of advancing and retracting in the longitudinal direction, and the main body (2). A first width adjusting device (10) provided with a shaft member (10a) having a groove for making the resin material supplied to the second inlet channel (2b) to have a predetermined width, and the first width adjusting device (10) provided on the main body (2). A shaft member (11) having a groove for making a predetermined width the resin material supplied to the third inlet channel (2c).
The second width adjusting device (11) consisting of a) and the advancing and retracting members (18c, 20c) are formed on the facing surfaces (18cA, 20cA) and opened in the same direction as the resin material flows. A notch recess (50), and by advancing and retracting the advancing and retracting members (18c, 20c) along the longitudinal direction, the facing surfaces (18c).
A, 20cA) are separated, slightly opened and fully opened due to contact with each other, and slightly closed or fully closed, so that the first inlet flow path (2a) is passed through each notch recess (50). 2. A laminating apparatus for a multi-layer extrusion molding machine, wherein the cross section of the resin passage is continuously changed.