JPH0839648A - Production of intermediate film for safety glass - Google Patents

Abstract

PURPOSE:To produce an intermediate film for safety glass free from optical strain and excellent in transparency, adhesiveness and piercing resistance by using two or more kinds of thermoplastic resins different in flow characteristics. CONSTITUTION:Individual passages permitting at least two or more kinds of thermoplastic resins to flow, vane blades capable of adjusting the flow velocities of the thermoplastic resins flowing through the individual passages and the confluent part of these thermoplastic resins are provided to a lamination apparatus 12 and a plurality of the thermoplastic resins extruded from an extruder are passed through the lamination apparatus 12 to form a laminate which is, in turn, extruded from an extrusion mold 14 to be formed into a film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a multilayer interlayer film for laminated glass used for laminated glass.

[0002]

2. Description of the Related Art Conventionally, a laminated glass in which an interlayer film made of a transparent and flexible thermoplastic resin such as plasticized polyvinyl butyral resin is adhered between two glass plates has been widely used as a window glass for buildings and automobiles. Has been. The above laminated glass of this type, depending on the type of interlayer film used,
Some of them have various properties such as weather resistance, adhesiveness with glass, no scattering of fragments, and good transparency, and they are properly used depending on the purpose.

However, in recent years, the applications of laminated glass have been diversified, and there has been a wide demand for improvement in the added value of laminated glass such as decorativeness, heat insulation, and processability. For this reason, it is difficult to satisfy all the requirements with an intermediate film made of a single material, and attention has been paid to a multilayer interlayer film instead of a single layer interlayer film.

In order to meet the above requirements, for example, in Japanese Patent Publication No. 1-43606, a torpedo-shaped probe provided with a wedge-shaped extrusion orifice is inserted into the manifold of a sheet-shaped extrusion molding die, and the A method of manufacturing an intermediate film having a partial three-layer structure in which a colored band is an intermediate layer is proposed by supplying a main stream of a plastic resin to a manifold and a side stream of a colored thermoplastic resin to a probe.

[0005]

However, the thermoplastic resins used in the mainstream and the substream in the extrusion method and apparatus described in Japanese Patent Publication No. 1-43606 are substantially the same although they are colored or not. When a resin is used and two or more types of thermoplastic resins having different flow characteristics are supplied, the interface of the thermoplastic resins after merging is likely to be disturbed, and the other side of the glass passes through this laminated glass. When viewed, there is a problem that the image appears distorted and so-called optical distortion easily occurs.

The present invention has been made by paying attention to the above problems, and an object of the present invention is to solve these problems and to provide two or more kinds of heat having different flow characteristics. Provided is a method for producing an interlayer film for laminated glass, which is excellent in transparency, optical distortion, adhesiveness, penetration resistance and the like, using a plastic resin.

[0007]

In the method for producing an interlayer film for laminated glass according to the present invention, a plurality of thermoplastic resins extruded from an extruder are used, and a plurality of layers are combined by a laminating device and an extrusion die. A method for manufacturing an intermediate film for glass, wherein at least two or more kinds of thermoplastic resins flow through the laminating device, and flow rates of the thermoplastic resin flowing through the individual flow paths can be adjusted. With a vane blade,
Further, a confluence section where these thermoplastic resins merge is provided, and a plurality of thermoplastic resins extruded from the extruder are passed through the laminating apparatus to form a laminate, and the laminate is extruded from an extrusion die to form a film. It is characterized by

[0008]

In the method for producing an interlayer film for laminated glass according to the present invention, a laminating apparatus is provided immediately before the extrusion die, and the vane blade provided in the laminating apparatus causes the thermoplastic resin in each flow path to flow at a certain speed. Are laminated with almost the same adjustment, and then the laminate is extruded into a film by an extrusion die. Therefore, using two or more types of thermoplastic resins with different flow characteristics, there is no transparency, no optical distortion, and no adhesion. It is possible to manufacture an interlayer film for laminated glass, which has excellent properties and penetration resistance.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing an example of an apparatus used for producing an interlayer film for laminated glass according to the present invention, and FIG.
It is a B sectional view, and shows an extrusion die and a laminating apparatus provided immediately before it. In FIGS. 1 and 2, 10
Is a device including a laminating device and an extrusion die.
Reference numeral 0 denotes a laminating apparatus 12 and an extrusion die 14. The laminating apparatus 12 and the extrusion die 14 are connected by a die plate 16, and a sealing material 18 for preventing resin leakage is melted in the die plate 16. It is provided around the resin flow path.

In the laminating apparatus 12, the molten resin, which is a thermoplastic resin, is discharged from the die passage 1 through the extrusion channel 20.
Die inflow passage 2 of extrusion die 14 via passage 22 of 6
It is adapted to be extruded through a path communicated with No. 4. In the manifold 26 in the extrusion die 14, a lateral composite flow of molten resin is formed, which then passes through the pre-land flow passage 28 and is extruded through the land flow passage 30.

The width and height of the die plate 16 and the die inflow passage 24 of the extrusion die 14 are the width of the extrusion passage 20,
And approximately the same as the height.

The laminating apparatus 12 includes a housing plug 3
2 and 34 are provided, and the laminating apparatus 12 further includes
The flow paths 36, 38, and 40 are provided, and the flow paths 36, 3 and
8 and 40 are manifolds 42, 44, and 46 of the respective channels 48, 50, and 52 via the connection channels.
Is communicated to.

FIG. 3 is a detailed view of the portion A of FIG. FIG.
At the communication passage 54 communicating with the manifold 42,
A communication passage 56 communicating with the manifold 44 and a communication passage 58 communicating with the manifold 46 are provided.
Further, the flow paths 48, 50, and 52 are provided with restricting flow paths 61, 62, and 64 on the tip side, respectively.

Since the cross sections of the flow restricting flow paths 61, 62 and 64 are smaller than those of the manifolds 42, 44 and 46, that is, they are narrowed in a plane orthogonal to the flow direction of the molten resin, the manifold 42. It is possible to restrict the flow of the molten resin from the extrusion channels 20, 44, and 46 to the extrusion channel 20.

The flow paths 48, 50, and 52 merge at the merging portion 66 so that they are connected to the extrusion flow channel 20.

FIG. 4 is a sectional view taken along line CC of FIG.
FIG. 3 is a perspective view of a portion A of FIG. 2. In FIGS. 4 and 5, the width of the flow channel 52 is substantially the same as the width of the flow channel 20. The width of the flow paths 48, 50 and 52 is W, and the widths of the flow paths 48, 50 and 52 are limited by the inner walls 68 and 70 of the housing plugs 32 and 34.

Vane blades 72, 74 are pivotally mounted between channels 48 and 50 and between channels 50 and 52, respectively, to regulate the flow rate of the molten resin. ing.

The adjustment of the flow rate of the molten resin by the vane blades 72 and 74 will be described below. In the vane blade 72, round shafts 76, 78 at each end of the head 80 are supported by bearing surfaces 82, 84 in the housing plugs 32, 34, and in the vane blade 74 each end of the head 90. Round shafts 86, 88 of the bearing surface 92 in the housing,
Supported by 94.

Further, as shown in FIG. 3, the round shafts 76 and 86 are provided with pointed ends 96 of the vane blades 72 and 74, respectively.
Notches are provided for adjusting 98 in the circumferential direction about the round shafts 76 and 86, respectively. The housing plug 32 is provided with openings 100, 101 communicating with the inlet to the shaft provided with the notch.

Further, in FIG. 3, the adjustable distribution pin 10 near the pointed ends 96, 98 of the vane blades.
2, 103 are provided, and these distribution pins 10
Reference numerals 2 and 103 act on the flow paths 48 and 52, respectively. The cooperation of the distributor pins 102, 103 and the pointed ends 96, 98 of the vane blades adjacent the distributor pins 102, 103 determines the cross-sectional shape of the molten resin.

A method for manufacturing a multilayered interlayer film for laminated glass using the apparatus 10 described above will be described below. The vane blades 72 and 74 each having a width W of 4 inches are selected and set in the laminating apparatus 12. The laminating device 12
There are four channels 48, 50, 52 and extrusion channel 20.
It is provided with an inch width.

The pointed ends 9 of the vane blades 72, 74
By adjusting 6, 98, 3 at the junction 66
It is possible to obtain a laminated body that constitutes layers. Although the exact position of the pointed ends 96, 98 of the vane blades 72, 74 changes based on the relative viscosity of the flow of the molten resin that merges, the adjustment of the vane blades 72, 74 causes The width of the flow path can be adjusted, and by this adjustment, it is possible to join the flows of the molten resins at substantially the same flow rate.

The laminated body laminated in multiple layers at the merging portion 66 enters the extrusion die 14 provided with the manifold 26 having a width of 40 inches, and the spread ratio 10 is set in the extrusion die.
Pair 1 is given. Manifold 26
At the front end side of the laminated body, the laminated body becomes a sheet while expanding in width and is extruded from the front end of the extrusion die 14.

In the above embodiment, the case of a laminated body having a three-layer structure has been described, but the present invention is not limited to this.
For example, the present invention can be applied to a laminated body of two layers or four or more layers. Incidentally, FIG. 6 shows a cross-sectional view of a laminate having a three-layer structure. This laminated body is composed of three layers of 48b, 50b, and 52b.

FIG. 7 is a cross-sectional view of an essential part showing another example of the method for producing an interlayer film for laminated glass of the present invention, showing an example of a two-layer laminate. In FIG. 7, 10a and 11a are channels for the molten resin, and one vane blade 1 is provided between the channels 10a and 11a.
2a is provided. The operation of this embodiment is exactly the same as that of the above embodiment, and as a result, a two-layer laminate composed of 10b and 11b as shown in the sectional view of the laminate of FIG. 8 can be supplied to the extrusion die. .

FIG. 9 is a cross-sectional view of an essential part showing still another example of the method for producing an interlayer film for laminated glass according to the present invention, which shows an example of a five-layer laminate. In FIG. 9, reference numerals 20a, 21a, and 22a denote molten resin flow passages provided in the rear portion. The flow passages 20a, 21a, and
And 22a between the two vane blades 23a, 23a
b is provided, and the three-layer laminate as described in the above embodiment is supplied toward the front from the flow path 24a, and the vane blades 32a provided at two more positions at the tip of the flow path 24a. , 32b and the two layers of flow channels 30a, 31a merge the molten resin from the flow channels 30a, 31a to form the outer two layers. As shown in the cross-sectional view of FIG. , 21c, and 21d, the outer two layers 31b and 31c are laminated, and a laminate of five layers in total can be supplied to the extrusion die.

The method for producing an interlayer film for laminated glass of the present invention discloses only a few examples in the above embodiment,
The present invention is not limited to this example.

The thermoplastic resin used in the method for producing an interlayer film for laminated glass of the present invention is a synthetic resin,
A liquid crystalline polymer is suitable, and examples thereof include those suitable for interlayer films for laminated glass, such as plasticized polyvinyl butyral, vinyl chloride resin, ethylene-vinyl acetate resin, and urethane resin. Furthermore, the viscosity characteristics of these thermoplastic resins in the molten state may be the same,
Also, even if it is different, it does not hinder.

[0029]

In the method for producing an interlayer film for laminated glass according to the present invention, a laminating apparatus is provided immediately before the extrusion die, and the vane blade provided in the laminating apparatus is used to heat the flow passages. The flow rate of the plastic resin is adjusted to be almost the same, and the laminate is extruded into a film by an extrusion die. Therefore, two or more kinds of thermoplastic resins having different flow characteristics are used for transparency and optical It is possible to manufacture an interlayer film for laminated glass which is free from distortion and is excellent in adhesiveness, penetration resistance and the like.

[Brief description of drawings]

FIG. 1 is a top view showing an example of an apparatus in a method for producing an interlayer film for laminated glass according to the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a detailed view of a part A in FIG. 2;

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is a perspective view of a portion A of FIG.

FIG. 6 is a cross-sectional view of a laminate having a three-layer structure.

FIG. 7 is a cross-sectional view of essential parts showing another example of the method for producing an interlayer film for laminated glass according to the present invention.

FIG. 8 is a cross-sectional view of a laminated body.

FIG. 9 is a cross-sectional view of a main part showing still another example of the method for producing an interlayer film for laminated glass according to the present invention.

FIG. 10 is a cross-sectional view of a laminated body.

[Explanation of symbols]

10 Devices 10b, 11b, 21b, 21c, 21d, 31b, 3
1c, 48a, 50a, 52a Resin layer 12 Laminating apparatus 14 Extrusion die 16 Die plate 20 Extrusion channel 22, 36, 38, 40, 48, 50, 52, 10a,
11a, 20a, 21a, 22a, 24a, 30a, 3
1a flow path 24 die inflow flow path 26, 42, 44, 46 manifold 28 pre-land flow path 30 land flow path 32, 34 housing plug 54, 56, 58 connecting path 61, 62, 64 restricting flow path 66 confluent section 68, 70 Inner wall 72, 74, 12a, 23a, 23b, 32a, 32b
Vane blade 76, 78, 86, 88 Round shaft 80, 90 Head 82, 84, 92, 94 Bearing surface 96, 98 Sharp end 100, 101 Opening 102, 103 Distribution pin 104, 105 Long groove W width

Claims (1)

[Claims] 1. A method for producing a multilayer interlayer film for laminated glass by using a laminating apparatus and an extrusion die, using a plurality of thermoplastic resins extruded from an extruder, wherein the laminating apparatus comprises at least An individual flow path through which two or more types of thermoplastic resins flow, a vane blade capable of adjusting the flow rate of the thermoplastic resin flowing through these individual flow paths, and a confluence portion where these thermoplastic resins merge Manufacture of an interlayer film for laminated glass, which is characterized in that a plurality of thermoplastic resins extruded from an extruder are passed through the laminating device to form a laminate, and the laminate is extruded from an extrusion die to form a film. Method.