JPS59128236A - Manufacture of laminated glass and rubber bag for preliminary press bonding - Google Patents

Abstract

PURPOSE:To carry out efficiently the preliminary press bonding of laminates each holding an interlayer for laminated glass between planar materials such as glass sheets by putting the laminates in a rubber bag provided with a heating element and by supplying electric current to the heating element under reduced pressure to heat uniformly the laminates in a short time. CONSTITUTION:Laminates 6 each holding an interlayer 8 for laminated glass between glass sheets or other planar materials 7, 7' are put in a rubber bag 1 at least part of which is made of a heating element from the inlet 2. The bag 1 may be provided with a heating element 4 such as a linear or planar heating element. The bag 1 is evacuated from a suction hole 3, and electric current is supplied to the element 4 through electrode cords 5 to heat the laminates 6 under reduced pressure. The preliminary press bonding of the laminates 6 are efficiently carried out with said simple small-sized device while saving heat energy to manufacture laminated glass.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a pre-press bonded sliding laminated glass using a rubber bag equipped with a heating mechanism, and the rubber bag.

Currently, so-called laminated glass such as laminated windshields for automobiles, laminated glass for buildings, solar cells made of silicone wafers, etc. are made of polyvinyl butyral, polyacrylic resin, polyurethane, etc. between multiple glass plates or striped glass plates and the back plate material. After sandwiching an intermediate film made of thermoplastic resin, a preliminary pressure bonding process is performed, and then a main pressure bonding process is performed. This pre-press bonding process can be carried out, for example, by a nip roller method in which a laminate in which an interlayer film is sandwiched between glass plates that have been heated (1-λ) is passed between nip rolls to deaerate the air existing between the glass plates and the interlayer film; A rubber bag method has been adopted industrially, in which a laminate sandwiching an interlayer film is placed in a rubber bag, the pressure is reduced, the air is removed, and the bag is heated.

The latter method is characterized in that, although the work is complicated, it can also be applied to preliminary pressure bonding of curved, square laminated glass.

Conventionally, in the pre-crimping method using a rubber bag, for example, an interlayer film is sandwiched between glass plates of the same size, the protruding part of the interlayer film is cut and removed, and then the interlayer film is placed in a rubber bag, which is then connected to a pressure reducing device. The entire rubber bag is heated in an oven while reducing the pressure inside the rubber bag, and the glass plates are preliminarily bonded together using an intermediate adhesive layer. There were many shortcomings, and the method was not necessarily satisfactory.

(2) A difference of 5 to 10 degrees Celsius may occur in the temperature distribution on the inner surface of the glass depending on the distance of the oven heater, air circulation conditions, etc.

■ Because the glass is heated through the rubber bag, the amount of heat needed to heat the rubber bag itself is required, and in order to ensure the minimum temperature of the glass surface, the temperature is higher than necessary (
(This requires a larger heat source, greater air circulation capacity (fan capacity), and also shortens the life of the rubber bag.

■ The temperature increase rate of the laminate is slow.

■ When using an air circulation oven, a separate heater is required, which increases the size of the device.

The inventor of the present invention, No. 1, has conducted extensive research on how to speed up the temperature rise of the glass surface during pre-pressing in the laminated glass manufacturing process and reduce the temperature distribution differences in each part of the glass surface. If the rubber bag itself is composed of a heating element, the above purpose can be achieved, and large equipment such as an oven is not required, and the air between the glass plate or curved surface material and the interlayer film can be effectively degassed. It was discovered that this could be done, and the present invention was completed.

That is, the purpose of the present invention is to quickly increase the heating rate of the glass surface, make the temperature distribution uniform in each part of the glass surface,
Another object of the present invention is to provide a method for manufacturing laminated glass that can effectively degas the air between a glass plate or curved surface material and an interlayer film, and a rubber bag used in the manufacturing method.

Therefore, the gist of the present invention is to provide a method for manufacturing laminated glass in which a laminate sandwiching a glass plate or other surface material with an intermediate layer for laminated glass is placed in a rubber bag and pre-pressed under reduced pressure. A method for producing laminated glass and a method for producing laminated glass, characterized in that at least a part of the bar bag is made up of a heating element or is equipped with a heating element, and the heating element is heated by being energized. A rubber bag for preliminary crimping, characterized in that at least a part of the rubber bag is made up of a heating element and is equipped with a heating element. .

The present invention will be described in detail.

The laminated glass produced in the present invention is a general term for a laminated body in which glass and other face materials are laminated and bonded via an interlayer film for laminated glass, and the plate (face) material can of course be a glass plate. Other surface materials may be used without any particular restrictions as long as they do not undergo thermal deformation during the laminated glass manufacturing process. For example, transparent materials include acrylic glass, polycarbonate sheets, synthetic resin sheets such as epoxy resin sheets, and opaque materials include striped iron sheets, stainless steel sheets, copper sheets, metal sheets such as aluminum sheets, opaque glass sheets, and asbestos sheets. , mortar board, etc., and a combination of these may be used. It is preferable that at least one surface of the laminated glass is a transparent plate, particularly a glass plate. Further, the laminated glass may be a laminate of three or more layers.

The interlayer film for laminated glass used in the method of the present invention is a thermoplastic resin film or sheet, and is not particularly limited as long as it has adhesive properties and durability, but examples include polyvinyl butyral, ethylene-acrylic acid copolymer, Examples include ethylene-acrylic ester copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, hydrolysates of these resins, polyurethane, etc. Among these, polyurethane, plasticized polyvinyl butyral, etc. is preferred. The interlayer film generally has fine irregularities on its front and back surfaces to prevent blocking between the interlayers, to prevent blocking during lamination of glass plates or face materials, and to improve the degassing properties of the laminate. It is provided.

The rubber bag used for preliminary crimping of laminated glass of the present invention is connected to a wide loading port for loading a laminate in which an interlayer film for laminated glass is sandwiched between glass plate sheets or other surface materials, and to a decompression device. It is an elastic and flexible bag with suction holes on two sides, the front and the back, and at least a part of the bag, preferably one side, is made up of a heating element, or the heating element is made of rubber so that the laminate can be heated under reduced pressure. It is attached to a bag. As the heating element, either or a combination of a linear heating element and a planar heating element can be used, and these are normally energized to generate heat. For linear heating elements, for example, a core material such as Tetoron thread is used (a heating wire is wound around it,
To ensure safety, it is torn with a temperature-sensitive material such as nylon and then covered with vinyl chloride resin. This is then wired meanderingly onto a heat equalizing plate such as aluminum foil (board) to make it flat, and both sides are heat-resistant. The meandering wiring is fixed by laminating it with a rubber-like elastic sheet or film such as soft vinyl chloride resin. Also,
Planar heating elements are made by, for example, adding conductive carbon to fluororesin to form a film or sheet, and pressing copper foil onto both sides to make electrodes, or by applying conductive carbon to cotton cloth and forming it into a film or sheet. An electrode wire is woven into the electrode wire, and a copper plate is crimped onto the end of the electrode wire to form a connection terminal. The heating element is /
If the wire is broken in one place, the heating element loses its operating capacity of 14 Pa, so it is desirable to use a planar heating element as the rubber bag.

Although it depends on the size of the rubber bag and the size of the laminated glass, it is preferable that a plurality of heating elements are arranged on at least one side of the rubber bag, and in this case, the heating elements do not necessarily need to be adjacent to each other. There may be a slight interval. In particular, it is desirable that a plurality of heating elements be arranged in pairs on both sides. Furthermore, it is most preferable that the plurality of heat generating elements are arranged in an annular shape around the surface of the rubber bag and that part which the central part of the laminated glass comes into contact with, from the viewpoint of improving the degassing performance. Of course, in this case, it is preferable that the heating elements (!) be adjacent to each other.

The rubber bag of the present invention is shown in the drawing (C) (1) In detail, Fig. 1 shows the rubber bag of the present invention composed of a heating element, and Fig. 2 shows the rubber bag of the invention in which a plurality of heating elements are arranged on one side of the rubber bag. In the figure, / and 21 are rubber bags, λ and 22 are loading ports for the laminate, and 3 and -3.
are suction ports, 5 and 23.23', 23' are electrode cords, 6 and 2 are laminates before pre-crimping, 7.7' and λ7 .27' indicates a surface material such as glass, and g and 2g indicate an interlayer film, respectively.

The method for manufacturing laminated glass of the present invention consists in performing preliminary pressure bonding using the rubber bag configured as described above. For example, if a laminate in which an interlayer film for laminated glass is sandwiched between glass plates or other surface materials is small compared to the size of the rubber bag, multiple laminates may be used to generate heat as shown in Figure 1. After charging the bag into a rubber bag (1) consisting of a plastic body and sealing the charging port (2), connect the suction port (3) to a decompression device to suck it up and check the degree of vacuum inside the rubber bag. raise it as far as it will go, then connect the heating element (4) with the electrode cord (!i).
) to 1-laminate at BO~100°C, preferably 75°C.
~q! Preliminary pressure bonding is performed by heating I'cVc. It is desirable to cover the rubber bag with a heat insulating material such as foamed polyurethane to prevent heat dissipation while electricity is being applied. As shown, the laminate 26 is placed in a rubber bag (21).
After the charging port (C22) is sealed, the suction port (23)
Connect to the pressure reducing device (7. While increasing the degree of vacuum inside the rubber bag, pass electricity through the electrode cords (2S) one after another and connect the heating element 2.
/I- is heated and after a short time the electrode cord (,2,!i′)
energizes to heat the heating element (2t'), further energizes the electrode cord (2S'') to heat the heating element (2q''),
The laminate (26) is heated and pre-pressed gradually outward from the center. Since the laminate (2) is heated from its center, the uneven intermediate ji (2r) gradually softens (melts) from the center outward. Therefore, degassing occurs from the central portion as the interlayer film (2g) softens, and the laminate can be pre-pressured and bonded with good degassing properties.

According to the manufacturing method of the laminated glass of the present invention which is pre-pressed using the rubber bag of the present invention, since the rubber bag itself is a heating element, there is no need for a large device, and the rubber bag and the laminate are heated by contact. The temperature can be set lower than when it is open. Further, since the laminated glass laminate is heated at the same time as the heating element is energized, the temperature of the laminate increases quickly, the time required for the preliminary pressure bonding process is shortened, and the laminated glass manufacturing cycle is shortened. Furthermore, in the method of the present invention, the in-plane temperature distribution of the laminate during heating is extremely good, and even if there is a temperature difference, the difference is only 7 to 2° C., and uniform heating is possible.

Further, the rubber bag of the present invention can be partially heated depending on its design. For example, heating of a wind seal or the like can be started from the center, and an ideal heating method can be adopted.

The present invention will be described in detail below with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Example: A square rubber bag with a side of 7 m was constructed using a 2-cm thick sheet. The image side was covered with a foamed polyurethane sheet to serve as a heat insulating material.

A laminate was obtained in which a plasticized polyvinyl butyral sheet having a thickness of 0761 mπ was cut to the same size as the glass and sandwiched between two pieces of clear float glass each having a square shape of 30 crn on a side and a thickness of 31 mpi. The laminate was placed in the above-mentioned rubber bag, and the rubber bag was sealed. The rubber bag was placed under reduced pressure in an atmosphere of room temperature 2S°C, and was heated for 5 minutes while reducing the pressure.
After a few minutes, electricity was applied to heat it. During heating, the temperature of each part of the surface of the laminate was almost uniform. After g minutes, the temperature of the stack is gθ
℃ reached. After the electricity was turned off and left for 3 minutes, the bag was cooled for 2 minutes using an electric fan, and the inside of the rubber bag was returned to atmospheric pressure to complete the preliminary crimping.

The deaeration state of the laminate after preliminary pressure bonding was good, and its transparency was extremely good at t7 compared to that of a laminate heated in a normal open state.

Example Fig. 2 1 (Otsu OCm X 30 G+ heating element (
21/-), and around it a heating element of 7θαχ 5crn (
2Z') and /iocmx, 55cm heating element (2 da)
A rubber bag with the same structure was constructed (the heating element was the same as that used in Example 1). Both sides were covered with foamed polyurethane sheets to serve as a heat insulator.

An interlayer plasticized polyvinyl butyral sheet with a thickness of 0.7 A M was sandwiched and laminated between two rectangular glass plates of SOα x qOcm and a thickness of 3 mm, and the protruding interlayer film was cut and removed along the end surface of the laminate. did. After the laminate was placed in the rubber bag, it was sealed and the pressure was reduced for S minutes in an atmosphere of 2S°C. Thereafter, electricity was started to heat the heating element (21) while the pressure was reduced, and then electricity was applied to the heating element (2g') and the heating element (2tier) at 3 minute intervals to heat each heating element. When the temperature of the entire laminate reached gθ°C, the electricity was turned off and the bag was allowed to cool sufficiently, and then the inside of the rubber bag was returned to atmospheric pressure to complete the preliminary crimping.

The laminated glass subjected to preliminary pressure bonding was well deaerated and had uniform transparency including the central portion. In addition, in the conventional preliminary pressure bonding, the transparency of the periphery of the laminate was poor, and the transparency was poor in the center.

Moreover, the sealing condition of the end face was also good.

[Brief explanation of the drawing]

1 and 2 show a rubber bag of the present invention. In the figure, l and 21 are rubber bags, c and 22 are charging ports, 3 and 23 are suction ports, g, 2g, 2q', and q〃 are heating elements, and ot and 2 are laminates, respectively. Applicant Mitsubishi Monsanto Kasei Co., Ltd. Agent Patent attorney Yo Hase - 1 other person

Claims (1)

[Scope of Claims] (1) A method for manufacturing laminated glass in which a laminate in which an interlayer film for laminated glass is sandwiched between glass plates or other surface materials is placed in a rubber bag and pre-pressed under reduced pressure, A method for manufacturing laminated glass, characterized in that at least a portion of the rubber bag is made up of a heating element or is equipped with a heating element, and the heating element is heated by passing an electric current through it (2) Heat generation (3) A method for producing a laminated glass according to claim 1, wherein the heating element is a linear heating element or a striped heating element.
c Claim 1, which is a rubber bag in which a plurality of rubber bags are arranged.
(4) A rubber bag in which a plurality of heat generating elements are arranged in an annular manner on the surface of the rubber bag where the central portion of the laminated glass comes into contact, and in the middle and upper part of the rubber bag, according to claim 7. (5) A method for manufacturing a laminated glass according to claim 1 or 3, in which a plurality of heating elements are sequentially heated outward from a central portion. Method (6) A rubber bag used in a preliminary pressure bonding process during the production of laminated glass, characterized in that at least a part of the rubber bag is composed of a heating element or is equipped with a heating element. (7) A rubber bag for preliminary crimping according to claim 6, wherein the heating element is a molten heating element or a planar heating element (8) A plurality of VC heating elements on at least one side of the rubber bag A rubber bag (9) for preliminary crimping according to claim 1, in which a plurality of heating elements are arranged in an annular shape around the central part of the laminated glass or the surface of the rubber bag and that part. A rubber bag for preliminary crimping according to claim 6 or 3, wherein