JPH04244825A - Production device for thermoplastic resin sheet - Google Patents

Abstract

PURPOSE:To vary the type of a colored band freely during production in a device for manufacturing a thermoplastic resin sheet with a transparent resin layer formed of a thermoplastic resin and the colored band buried into the transparent resin layer. CONSTITUTION:A conduit 2 capable of feeding a colored thermoplastic resin (b) is disposed into the manifold 3 of a mold for extrusion molding supplied with a transparent thermoplastic resin. The conduit 2 is supported movably in the axial direction of the conduit 2 by both side plates 15, 16 mounted on both sides of the manifold 3. The opening width of a slit 8 formed to the conduit 2 is changed by moving the conduit 2.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a thermoplastic resin sheet manufacturing apparatus that is suitably used when extrusion molding two types of thermoplastic resins, and in particular, the present invention relates to a thermoplastic resin sheet manufacturing apparatus that is suitably used when extrusion molding two types of thermoplastic resins. The present invention relates to a thermoplastic resin sheet manufacturing device that can be freely changed.

0002

[Prior Art] Windshield glass used in automobiles, airplanes, etc., and laminated glass used in building windows, etc., are made of plasticized polyvinyl butyral resin between two opposing glass plates. It is constructed by sandwiching an interlayer film consisting of.

[0003] In order to manufacture an interlayer film used in such laminated glass, generally, polyvinyl butyral resin that has been heated and melted while being kneaded in a cylinder is fed to an extrusion mold. A method of obtaining a thin interlayer film by extruding from The interlayer film obtained in this way is colorless and transparent and transmits most of the light rays, so attempts have been made to provide a band-shaped colored part in a part of the width direction of the interlayer film in order to limit the transmission of light rays. . For example, in thermoplastic sheets used in automobile windshields, the upper region of the sheet may be provided with a colored band having a gradient of concentration to reduce the amount of sunlight that shines through the windshield onto the driver.

[0004] In order to provide such a colored band on a sheet, Japanese Patent Publication No. 1-43606 discloses a method of manufacturing a sheet in which a colored band of a predetermined width is enclosed in a resin layer formed of a thermoplastic resin. Proposed. In this method, the colored thermoplastic resin extruded from the slit of the torpedo-shaped probe is confined in the main stream while the main stream of thermoplastic resin enters the manifold, passes through the land, and is extruded from the slit-shaped die orifice. be. In other words, a manifold to which a transparent thermoplastic resin is supplied, a torpedo-shaped probe disposed within the manifold to feed a colored thermoplastic resin into the manifold, and a slit-shaped die orifice as an outlet of the extruded sheet. and a land section provided between the manifold and the slit-shaped die orifice to obtain a thermoplastic resin sheet having a three-layer structure in which a colored band is embedded in the resin layer. be.

By the way, it is desired to freely change the width of the colored band depending on the type of product, but this cannot be done with the above-mentioned apparatus. For example, Japanese Patent Publication No. 54-26590, Japanese Patent Application Publication No. 57-14018, Japanese Patent Application Publication No. 61-270
Publication No. 133 proposes a method in which an internal deckle and distribution pipe are provided in the manifold, and the flow rate and thickness of the mold outlet are adjusted by movable, thereby changing the sheet configuration and sheet width. However, these methods cannot change the width of the colored band described above. When changing the width of the intermediate layer, it is possible to replace the probe with a probe with a different slit size, but in this case, it is necessary to temporarily stop production, which reduces productivity and also requires disassembly of the mold. The disadvantage is that cleaning is required and material loss increases.

[0006]

[Problems to be Solved by the Invention] The present invention has been made by paying attention to the above-mentioned actual situation, and its purpose is to provide a heat treatment system that allows the width of the colored band to be freely changed even during continuous production. An object of the present invention is to provide an apparatus for manufacturing a plastic resin sheet.

[0007]

[Means for Solving the Problems] The thermoplastic resin sheet manufacturing apparatus of the present invention includes a first resin layer formed of a first thermoplastic resin, and a thermoplastic resin sheet embedded in the first resin layer. Second
a second resin layer of a predetermined width formed of a thermoplastic resin;
An apparatus for manufacturing a thermoplastic resin sheet having an extrusion mold and a conduit, the extrusion mold comprising a manifold and side plates provided on both sides of the manifold in the width direction. a resin supply path for supplying a first thermoplastic resin into the manifold; and a slit-shaped die orifice through which the thermoplastic resin is extruded outward from the manifold to form the first resin layer. , the conduit is disposed within the manifold, and both ends thereof are supported by the side plates so as to be movable in the axial direction of the conduit, and the conduit has the slit shape capable of supplying the second thermoplastic resin into the manifold. It has a slit that is substantially parallel to the die orifice, and at least one end edge of the slit in the width direction is positioned inside the slit-shaped die orifice and outside of the die orifice due to movement of the conduit. It is configured to be switchable, thereby achieving the above object.

1 to 3 show an apparatus for manufacturing a thermoplastic resin sheet according to the present invention.

The apparatus includes an extrusion mold 1 and a conduit 2. The mold 1 includes a manifold 3 in which a conduit 2 is disposed, side plates 15 and 16 provided in the width direction of the manifold 3, and a transparent thermoplastic resin (hereinafter referred to as transparent) molten in the manifold 3. It has a resin supply path 4 that supplies resin (referred to as resin) a, a slit-shaped die orifice 6 as an outlet of the extruded sheet, and a land portion 7 as a resin passage through which resin a is sent from the manifold 3 to the die orifice 6. There is.

The manifold 3 has a substantially circular cross section and is provided over substantially the entire width of the mold 1. A resin inlet 41 is provided at one end of the manifold 3,
Thermoplastic resin a is supplied into the manifold 3 from a resin extrusion device (not shown) through a resin supply path 4 and a resin inlet 41.

A conduit 2 disposed within the manifold 3
is formed of a long cylindrical member. An inlet 20 for colored thermoplastic resin (hereinafter referred to as colored resin) b is formed at one end of the conduit 2 (the resin inlet 41 side), and the opening at the other end of the conduit 2 is formed by a blind flange 21. is blocked by. A resin supply path 5 provided in the conduit 2 opens in the manifold 3, and a conduit slit 8 is formed in this opening. The resin inlet 20 is equipped with a colored resin extrusion device (
(not shown) is connected, and the colored resin b extruded from the extrusion device is configured to flow into the manifold 3 from the inlet 20 through the resin supply path 5 and the conduit slit 8.

As shown in FIG. 2, the conduit slit 8 is provided in the conduit 2 so as to be parallel to the slit-shaped die orifice 6 and to face the land portion 7 side. The conduit slit 8
The length (width) dimension of is the length (width) of the slit-shaped orifice 6 (
The vertical width of the conduit slit 8 is set to be equal to or smaller than the vertical width of the slit-shaped die orifice 6. The shape of the conduit slit 8 can be, for example, the shape shown in FIG. In this example,
The conduit slit 8 has a horizontally long first opening 81 and a first
It is formed from a second opening 82 that is continuous with the tip of the opening 81 and has a tapered tip.

The conduit 2 is disposed within the manifold 3 over its entire width, and both ends of the conduit 2 are connected to the side plates 15, 1.
6, respectively, so as to be slidable. That is, the side plates 15 and 16 are provided with insertion holes 17 and 18, respectively, and the conduit 2 is slidably inserted into each of the insertion holes 17 and 18. A drive device (not shown) is connected to one end of the conduit 2 for moving the conduit 2 in its axial direction. Fixing blocks 22 and 23 are fixed to the outer surfaces of the side plates 15 and 16, and the conduit 2 is inserted into through holes 24 and 24 formed in the fixing blocks 22 and 23, and the inner surfaces of the fixing blocks 22 and 23 are A seal ring 25 provided in
, 25 are in sliding contact with the outer peripheral surface of the conduit 2.

One end edge (the left edge in FIG. 3) of the conduit slit 8 provided in the conduit 2 can be positioned inside or outside the die orifice 6 as the conduit 2 moves. is configured to be switchable. That is, by moving the conduit 2 in the axial direction, the width of the conduit slit 8 is closed by the side wall portion 10, so that the opening width of the conduit slit 8 can be changed.

Next, a method for manufacturing a thermoplastic resin sheet using the above-described apparatus of the present invention will be explained.

Transparent resin a supplied into the manifold 3
is sequentially filled in the manifold 3 from the inlet 41 side,
It is pushed out from the slit-shaped die orifice 6 via the land portion 7 . On the other hand, the colored resin b supplied into the resin supply path 5 of the conduit 2 is sent into the manifold 3 through the conduit slit 8 of the conduit 2. Then, a colored band B of a predetermined width formed of the colored resin b is embedded in the transparent resin layer A formed of the transparent resin a. Here, since the width of the colored band B is influenced by the width of the conduit slit 8 described above, the width of the colored band B can be changed by changing the opening width of the conduit slit 8. That is, by moving the conduit 2 in its axial direction by driving the drive device and changing the opening width of the conduit slit 8, the width of the colored band B can be changed accordingly. This operation of changing the opening width of the conduit slit 8 can be performed without any problem even during the production of the sheet.

In addition, the shape of the conduit slit 8 is not rectangular, for example, as shown in FIG.
By making the tip (opposite to the side that is blocked by Since the shape of the slit changes, not only the width dimension of the colored band B but also the thickness and cross-sectional shape of the colored band B can be changed.

Thermoplastic resin a used in the present invention
Or b includes, for example, polyethylene, polypropylene, polystyrene, polycarbonate, vinyl chloride resin,
Nylon resin, polyvinyl acetal, acrylic resin,
Examples include acetal resin and polyester resin. Plasticizers, fillers, etc. may be added to these thermoplastic resins.

[0019]

[Examples] The present invention will be explained below with reference to Examples and Comparative Examples.

Using the apparatus shown in FIG. 1, a thermoplastic resin sheet was extruded and molded under the following conditions.

<Extrusion mold> The dimensions of each member of the extrusion mold used will be explained based on FIG. 1.

Width of die orifice 6: 1000 mm Diameter of manifold 3: R30 mm Diameter of conduit 2: R16 mm Length of land portion 7: 50 mm Clearance of land portion 7: 0.5 mm Between slit 8 of conduit 2 and land portion 7 Distance: 10 mm Shape of slit 8 of conduit 2: Shape shown in FIG. 4 In FIG. 4(a), the horizontal axis represents the width of the conduit slit 8 as shown in FIG. 4(b).
It is expressed by the dimension from the base k of the conduit slit 8, and the vertical axis represents the vertical dimension t of the conduit slit 8.

<Extrusion test conditions> Resin amount ratio...transparent resin: colored resin = 10:1 resin temperature...
Transparent resin: 160°C, colored resin: 150°C Type of resin used...Transparent resin: polyvinyl butyral resin Colored resin: polyvinyl butyral resin (colored with dye or pigment) Example 1 The slit of the conduit 2 is as shown in Fig. 4 ( A sample having dimensions represented by curve C-1 shown in a) was used.

The setting position of the conduit slit 8 is such that the conduit 2 is set so that the base k of the slit 8 coincides with the opening edge of the die orifice 6 of the mold (that is, the conduit slit 8 is not blocked by the side wall portion 10). The tests were carried out for the case where the conduit 2 was moved toward the side plate 15 so that the base k of the slit 8 was blocked by 1 cm by the side wall 10, and then set.

The result of the color ratio of the colored band portion of the thermoplastic resin sheet obtained in the former case is represented by ◯ in FIG. 5, and the result in the latter case is represented by ● in FIG. Figure 5
From the results, when the sheet is extruded using the conduit 2 having the slit shape represented by C-1 in FIG. It can be seen that the shapes are significantly different. That is, when the sheet is extruded under the conditions indicated by ● in FIG. The thickness of the colored band B became thicker on the side, and the color ratio of the sheet at that part became higher. In addition,
The broken line in FIG. 5 indicates the colored band B under the extrusion conditions of ● above.
This shows the results when the concentration of colored resin b that forms It can be seen that a colored band B having the shape is obtained.

Example 2 A conduit 2 with a slit having a size represented by curve C-2 shown in FIG. 4(a) was used.

The setting position of the conduit slit 8 is such that the base k of the slit 8 coincides with the opening edge of the die orifice 6 of the mold (that is, the conduit slit 8 is not blocked by the side wall portion 10). The tests were carried out for the case where the conduit 2 was moved toward the side plate 15 so that the base k of the slit 8 was blocked by 1 cm by the side wall 10, and then set.

The result of the color ratio of the colored band portion of the thermoplastic resin sheet obtained in the former case is represented by △ in FIG. 6, and the result in the latter case is represented by ▽ in FIG. Figure 6
From the results, when the sheet is extruded using the conduit 2 having the slit shape represented by C-2 in FIG. It can be seen that the cross-sectional shape remains almost unchanged.

[0029]

[Effects of the Invention] According to the present invention, thermoplastic resin sheets with different forms of colored bands can be manufactured without stopping production, so productivity can be improved when manufacturing thermoplastic resin sheets of different types. There is no reduction in the temperature, and there is no material loss due to mold cleaning.

[Brief explanation of the drawing]

FIG. 1 is a horizontal sectional view of a thermoplastic resin sheet manufacturing apparatus of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a front view of essential parts of the conduit.

FIG. 4(a) is a graph showing the dimensions of the conduit slit;
(b) is a front view of the conduit slit.

FIG. 5 is a graph showing the relationship between the arrangement of the conduit slits and the color ratio when the conduit slits represented by C-1 in FIG. 4(a) are used.

FIG. 6 is a graph showing the relationship between the arrangement of the conduit slits and the color ratio when the conduit slits indicated by C-2 in FIG. 4(a) are used.

[Explanation of symbols]

1 Extrusion mold 2 Conduit 3 Manifold 4 Resin supply path 6 Slit-shaped die orifice 7 Land part 8 Conduit slit 15 Side plate 16 Side plate a Transparent resin b Colored resin A Transparent resin layer B Colored band

Claims (1)

[Claims] 1. A first resin layer formed of a first thermoplastic resin, and a second resin layer of a predetermined width embedded in the first resin layer and formed of a second thermoplastic resin. An apparatus for manufacturing a thermoplastic resin sheet having a resin layer, the apparatus comprising an extrusion mold and a conduit, the extrusion mold comprising:
a manifold; a side plate provided on both sides of the manifold in the width direction; a resin supply path for supplying a first thermoplastic resin into the manifold; and a resin supply path for supplying a first thermoplastic resin into the manifold; a slit-shaped die orifice in which a layer is formed, the conduit is disposed within the manifold, and both ends thereof are supported movably in the axial direction of the conduit by the side plates, and the conduit is disposed within the manifold. a slit substantially parallel to the slit-shaped die orifice capable of supplying the second thermoplastic resin to the slit-shaped die orifice, and at least one edge in the width direction of the slit is positioned inside the slit-shaped die orifice by movement of the conduit. A thermoplastic resin sheet manufacturing apparatus that is configured to be switchable between a state in which the sheet is located outside the die orifice and a state in which the sheet is located outside the die orifice.