JP6789179B2 - Opening structure of molded bag for laminated glass - Google Patents

Description

The present invention relates to an opening structure of a laminated glass molding bag used for manufacturing glass for building materials, windshields for automobiles, and the like.

Laminated glass is used for windshields of automobiles and windowpanes of high-rise buildings so that debris does not scatter even if it breaks. Laminated glass is a glass in which a heat-meltable polymer film such as polyvinyl butyral is provided between glass plates, and the polymer film is heated and melted to bring the glass plates into close contact with each other. Is.

Laminated glass is produced by the following method. A strong and flexible bag that can greatly reduce the internal pressure to near vacuum after providing a polymer film that bonds the glass plates between the two glass plates, that is, a molded bag for laminated glass. (Hereinafter, it is basically abbreviated as a molded bag).

Next, the molding bag is heat-treated in a hot atmosphere of generally 100 to 130 ° C. for 10 to 15 minutes, and during this period, the air in the molding bag is continuously sucked, and between the two glass plates. Degassing is performed to remove a small amount of air contained in the polymer film. In this way, the two glass plates are sandwiched between the bag walls and pressurized and heated by the pressure difference and heat generated inside and outside the molding bag to produce a laminated glass.

In the process of manufacturing laminated glass, when the laminated glass is taken out from the molding bag after the heating, suction, and pressurizing steps of the unbonded glass plate placed in the molding bag, the next unbonded glass plate is molded into the molding bag. The same process as described above is carried out in the glass, and the molded bag is used repeatedly. In order to proceed efficiently in the manufacturing process, it is important to perform decompression by suction, which occupies most of the work, that is, to evacuate smoothly and quickly, and for that purpose, quick closing operation of the opening and certainty in the closed state. Adhesion (airtightness) is required.

As a conventional structure of an opening for opening and closing a molded bag, as disclosed in Patent Document 1, a means for providing a continuous airtight fastener at each opening edge of the bag can be mentioned.
Further, as disclosed in Patent Document 2, a means using a sealing member in which a ridge extending along an opening and a ridge that can be engaged with the ridge are distributed and arranged in a pair of bag bodies. There is also.

Japanese Unexamined Patent Publication No. 2003-321257 Japanese Unexamined Patent Publication No. 2006-182581

The structure of the opening using the airtight fastener disclosed in Patent Document 1 requires a considerable amount of force to open and close due to the structure for providing airtightness, so that there is a problem that it takes time and labor to open and close the molding bag. there were.

In the structure using the seal member disclosed in Patent Document 2 for the opening, a series of ridges and dents are sequentially pushed from the ends to engage with each other, so that the work also requires considerable labor and time. Is hung. In addition, there are problems such as the protrusions and concaves are slightly deformed in length due to the engagement work while being handled strongly and do not match well, the engagement is easily disengaged in the middle, and foreign matter is easily caught. Yes, it was not an easy task.

An object of the present invention is to obtain an opening structure of a laminated glass molding bag which has been improved so that the opening and closing work of the molding bag can be performed faster than before without impairing the good airtightness when closed by further diligent research. It is in the point of providing.

The present invention includes a pair of bag main bodies 2 and 3, and an opening K formed by the outer edge portions 2a and 3a of the bag main bodies 2 and 3 and capable of switching between an open state and a closed state. In the opening structure of the laminated glass molding bag,
A sealing material 10 made of a material different from the material of the bag body 2 is provided on at least one of the outer edge portions 2a and 3a, and the closed state of the opening K is the sealing material 11 or the outer edge portion 3a and the seal. The contact with the material 10 and the open state of the opening K are due to the release of the contact between the sealing material 11 or the outer edge portion 3a and the sealing material 10.
The sealing material 10 and the outer edge portion 2a are integrated between the two 10 and 2a by vulcanization adhesion via an adhesive rubber layer 14.
In the adhesive rubber layer 14, a first rubber sheet 18 made of a first-class rubber, which is a material of the sealing material 10, and a second rubber sheet 19 made of a second-class rubber, which is a material of the outer edge portion 2a, are formed. It is characterized in that the first rubber sheet 18 is laminated so as to be adjacent to the sealing material 10.

The second invention relates to the opening structure of the laminated glass molding bag according to the present invention.
The sealing materials 10 and 11 are provided on each of the pair of outer edge portions 2a and 3a, and at least one of the sealing materials 10 and 11 is a rubber magnet R.
In the closed state of the opening K, both the sealing materials 10 and 11 are magnetically bonded to each other.

The third invention relates to the opening structure of the laminated glass molding bag according to the second invention.
The rubber material of the rubber magnet R is set to NBR, and the material of the second rubber sheet 19 is set to EPDM.

The fourth invention relates to the opening structure of the laminated glass molding bag according to the second or third invention.
The rubber magnet R is characterized in that ferrite powder is mixed with rubber.

A fifth aspect of the present invention is the opening structure of the laminated glass molding bag according to the second to fourth aspects of the present invention.
The pair of sealing materials 10 and 11 are both made of a rubber magnet R.

According to the present invention, since the sealing material is provided at the opening of the bag body, it is possible to improve the airtightness (airtightness) of the molded bag when it is closed. Since the rubber material of the sealing material and the rubber material of the bag body (outer edge) are different, the bag body is made of a rubber material with excellent strength, and the sealing material is made of a material with excellent adhesion and abrasion resistance. There is an advantage that suitable materials can be set for each of the bag body and the sealing material.

The bag body and the sealing material, which have different rubber materials, cannot be vulcanized and bonded well, but the first rubber sheet made of the sealing material and the second rubber sheet made of the outer edge material are laminated. It has been found that when the rubber layer is sandwiched between the first rubber sheets and the sealing material and vulcanized, the bag body and the sealing material can be well integrated.
As a result, it is possible to provide an improved opening structure of the laminated glass molding bag so that the opening and closing operation of the molding bag can be performed more quickly than before without impairing the good airtightness when closed.

According to the second invention, when the first sealing material and the second sealing material are relatively close to each other, both sealing materials are magnetically bonded to each other by the magnetic force when they are brought close to each other to a certain extent. ..
That is, in order to close the opening in the open state, it is only necessary to bring the first sealing material and the second sealing material close to each other, that is, one bag body and the other bag body, and a simple operation is required. Become.
Moreover, since the first sealing material and the second sealing material are magnetized in the closed state, the closed state can be maintained and good sealing performance can be maintained. In order to open the opening, it is only necessary to peel off the first sealing material and the second sealing material, that is, to separate the outer edges of the bag body from each other.
Therefore, the opening / closing operation can be performed quickly without impairing the good airtightness of the opening in the closed state, and it is possible to provide a more improved opening structure of the laminated glass molding bag.

According to the third invention, since the sealing material (rubber magnet) is made of NBR, it has excellent wear resistance and is suitable for openings that are frequently opened and closed, and the bag body is made of EPDM. Therefore, it has the advantage of being excellent in strength and flexibility and suitable for the bag body.

According to the fourth invention, since ferrite powder is used as the magnetic material to be kneaded with rubber, it can withstand heat treatment such as vulcanization while exhibiting good magnetic force, and the magnetic force does not drop even at high temperature. It has the effect of providing a rubber magnet suitable for a molded bag that is heated and pressurized.

According to the invention of claim 5, since both the first and second sealing materials are composed of rubber magnets, the magnetic adhesion is stronger than when only one of them is a rubber magnet, and better sealing performance is obtained. It is possible to provide an opening structure of a molded bag having a magnet.

Top view of a molded bag for laminated glass A plane showing the open state of the molding bag of FIG. AA sectional view of FIG. Sectional view of the main part showing the structure of the opening A method of integrating the sealing material and the outer edge portion is shown, (a) is a preparation step, and (b) is a vulcanization step. A cross-sectional view taken along the line BB of FIG. 1 is shown, where FIG. 1A is a closed state and FIG. 1B is an open state. Enlarged plan view of the main part showing the structure near the suction nozzle

Hereinafter, an embodiment of the opening structure of the laminated glass molding bag according to the present invention will be described with reference to the drawings, assuming that it is used for manufacturing a laminated glass for building materials and the like.

As shown in FIGS. 1 and 2, the molding bag (molded bag for laminated glass) 1 is formed by a pair of bag bodies 2 and 3 and outer edges 2a and 3a of the bag bodies 2 and 3 and is in an open state. It is configured to have an opening K capable of switching between the closed state and the closed state, and a seal portion S capable of switching the opening and closing of the opening K. The seal portion S includes an outer seal portion S1 formed on the outer edge of the bag and an inner seal portion S2 arranged near the inside of the outer seal portion S1.

FIG. 1 shows a molded bag 1 in a closed state in which the opening K is closed. In this closed state, the seal portion S, that is, the outer seal portion S1 and the inner seal portion S2 are in close contact with each other. ing. FIG. 2 shows a molded bag 1 in an open state in which the opening K is opened. In this open state, both the outer seal portion S1 and the inner seal portion S2 are in a non-seal state in which the adhesion is released. ..

In the bag bodies 2 and 3, only the bottom, which is the long side of the root side of each other, is integrated, and almost the entire tip side long side and both short sides of each bag body 2 and 3 are integrated, that is, three sides. It is open so that it can be opened and closed.
The molding bag 1 has a tip opening Ks which is a long side on the tip side, and openings Ki and Kt on one side and the other side which are both short sides and are open except for the end on the root side. That is, the molded bag 1 having a rectangular shape as a whole has openings K (Ki, Ks, Kt) that can be opened and closed on three of the four sides.

As shown in FIGS. 1 to 3, the bag bodies 2 and 3 are made of an EPDM laminated cloth (ethylene propylene rubber laminated) having a front surface rubber layer and a back surface rubber layer by laminating ethylene propylene rubber on both the front and back surfaces of the polyester fiber cloth. Cloth) consists of 4. Each of the bag main bodies 2 and 3 is configured by connecting and integrating the opening cloths 2B and 3B around the main body cloths 2A and 3A by using the connecting cloths 2C and 3C, but is formed of a series of integrated cloths. May be. A film sheet 5 made of fluororesin is crimped to at least the inner surface side of the bag main bodies 2 and 3 (main body cloths 2A and 3A) where the glass contacts. EPDM is desirable as the material for the bag bodies 2 and 3, but other than EPDM such as CR (chloroprene), fluororubber, and acrylic rubber may be used.

Inside the molding bag 1, twisted ropes 7 positioned in the front-rear and left-right directions by a plurality of loop-shaped cloths 8 are provided on the inner surface side of one of the bag bodies 2 which is the lower side when used as the molding bag 1. .. The loop cloth 8 is attached to the bag body 2 by using a cover cloth 15 or the like. The twisting rope 7 and the gap formed therein serve as an air passage, and vacuuming by decompression in the molding bag 1 using the suction nozzle 9 is smoothly performed. The connecting cloths 2C and 3C, the loop cloth 8 and the cover cloth 15 are preferably made of the same material as the bag bodies 2 and 3 (EPDM laminated cloth 4), but may be made of other materials.

As shown in FIGS. 1 to 3 and 7, the twisting rope 7 is formed by arranging one rope in a loop shape in the molding bag 1, and both rope ends 7a and 7b are sucked. Both ends of the base end pipe 6 of the nozzle 9 are locked with an insulator 16 or the like. The suction nozzle 9 is configured to include a nozzle main body 9A having a base end pipe 6 and a nozzle 9B projecting laterally from the nozzle main body 9A.

As shown in FIGS. 2 and 3, the outer sealing portion S1 has a first sealing material 10 attached to the outer edge portion 2a of one of the lower bag main bodies 2 and the other upper bag main body 3 It is configured to include a second sealing material 11 attached to the outer edge portion 3a of the above. Both the first and second sealing materials 10 and 11 are made of a rubber magnet (also called magnetic rubber or bond magnet) R in which ferrite powder is kneaded into NBR (nitrile rubber) and magnetized, and have a flat rectangular cross section. It is formed in a band shape and is attached to the inner side surface of the outer edge portions 2a and 3a of the corresponding bag main bodies 2 and 3. The hardness of the NBR forming the sealing materials 10 and 11 is preferably 70 to 90 (Sure A), and is attached to the bag bodies 2 and 3 by an adhesive rubber layer 14 (by vulcanization adhesion) as an example.

In the outer sealing portion S1, the opening K is closed when the outer surfaces 10A and 11A of the sealing materials 10 and 11 are in close contact with each other, and the first outer surface 10A and the second outer surface 11A are separated from each other. Is configured to be in the open state of the opening K. The outer sealing portion S1 has a configuration in which the first sealing material 10 and the second sealing material 11 are magnetically adhered to each other by magnetic force, whereby the first and second outer surfaces 10A and the second outer surface 11A are in close contact with each other. Therefore, the closed state of the opening K can be maintained. One of the first sealing material 10 and the second sealing material 11 is magnetized on the north pole, and one of the other is magnetized on the south pole.

As shown in FIGS. 2 and 3, the inner seal portion S2 has a first seal member 12 attached to one bag body 2 in the vicinity of the inside of the first seal material 10 and an inner side of the second seal material 11. It is configured to include a second seal member 13 attached to the other bag body 3 in the vicinity. The first and second sealing members are both made of rubber (synthetic rubber), specifically made of EPDM and formed in a strip shape having a flat rectangular cross section, and are immediately inside (5 mm) of the corresponding sealing materials 10 and 11. It is attached to the bag body 2 and 3 (with a certain distance). The hardness of EPDM forming the sealing members 12 and 13 is preferably 40 to 60 (Sure A), and is attached to the bag bodies 2 and 3 by an adhesive rubber layer 17 (by vulcanization adhesion) as an example.

In the inner seal portion S2, the opening K is closed when the upper surfaces 12A and 13A of the seal members 12 and 13 are in close contact with each other, and the first upper surface 12A and the second upper surface 13A are separated from each other. Is configured to be in the open state of the opening K. The hardness of the first and second sealing members 12 and 13 is set to be softer than that of the first and second sealing materials 10 and 11, and the upper surfaces can be simply overlapped with each other and brought into contact with each other without a gap or without a gap. It is configured so that there is little surface contact and a good sealing state can be obtained. The first and second sealing materials 10 and 11 are configured so that when the inside of the molding bag 1 is depressurized to some extent, they are more firmly adhered to each other without gaps, and the closed state of the opening K can be maintained well only by the inner sealing portion S2. Has been done.

As shown in FIGS. 6A and 6B, the first and second sealing materials 10 and 11 are connected to each other at the connecting portions of the bag bodies 2 and 3, that is, at the bottom portion which is the long side portion on the root side of each other. , Is integrated over a certain width. That is, it is configured to have a first base end portion 10B and a second base end portion 11B integrated with each other by the adhesive rubber layer 14 (by vulcanization adhesion). Therefore, when the molding bag 1 is opened wide, as shown in FIG. 6B, the bag is set with the ends of the first and second base end portions 10B and 11B (the ends on the tip opening Ks side) as virtual fulcrums. The main bodies 2 and 3 open and swing.

Next, the procedure of heating and pressurizing the molding bag 1 will be described. After the laminated glass G (see FIG. 1) is put into the open molded bag 1 shown in FIG. 2, the upper bag body 3 is held and the lower bag body 2 is covered with the operation. In this covering operation, the second sealing material 11 is attached to the first sealing material 10 and the second sealing member 13 is attached to the first sealing member 12 at each of the tip opening Ks and the one-side and other-side openings Ki and Kt. It is an operation to align and cover each. The point is that the upper bag body 3 may simply cover the lower bag body 2 so that the outer lines of the bag bodies 2 and 3 match in the vertical direction.

When the molding bag 1 is sealed with all the openings Ki, Ks, and Kt closed by combining the bag bodies 2 and 3, the air inside the molding bag 1 is evacuated from the suction nozzle 9 by a pump (not shown) to reduce the pressure. Perform the vacuuming process. At the start of this evacuation process, the inside and outside of the bag are well sealed by the outer seal portion S1 in which the first outer surface 10A and the second outer surface 11A are in close contact with each other by magnetic force, and air is evacuated from the outside. It is quickly decompressed without inhaling.

Then, when the air is evacuated to some extent and the air pressure inside the bag drops, the contact force between the first upper surface 12A and the second upper surface 13A increases and the inner seal portion S2 functions so as to be in perfect contact with each other. Is started. That is, the inner seal portion S2 is set to exhibit excellent sealing performance due to a stronger adhesion force than the outer seal portion S1. Therefore, when the bag 1 is operated as a molding bag 1 (during heating and pressurization) when the pressure inside the bag is reduced to a vacuum close to that of a vacuum, sufficient sealing property is substantially exhibited only by the inner sealing portion S2, and the outer sealing portion is exhibited. It can be said that S1 has a function as a preliminary seal until the inner seal portion S2 has a full-scale sealing function.

While the molding bag 1 is evacuated for a predetermined time, the molding bag 1 is heated to a predetermined high temperature by a heating means (not shown) such as a heater. Therefore, the laminated glass G (see FIG. 1) placed in the bag is pushed by the bag bodies 2 and 3 to be strongly pressurized and heated between the bag bodies 2 and 3, and a pair of glasses. The polymer film existing between them is also degassed, and the laminated glass G is firmly integrated.

Next, the structure of the opening K will be described in detail. As shown in FIGS. 3 and 4, in the outer sealing portion S1, the first and second sealing materials 10 and 11 which are rubber magnets made of NBR and the bag bodies 2 and 3 made of EPDM are bonded rubber layers. It is integrated by vulcanization adhesion with 14 in between. The adhesive rubber layer 14 is a first rubber sheet 18 made of NBR (an example of first-class rubber) which is a material of sealing materials 10 and 11, and EPDM (an example of second-class rubber) which is a material of outer edge portions 2a and 3a. ) Is formed into a two-layer structure in which the first rubber sheet 18 is laminated on the sealing materials 10 and 11 adjacent to each other.

The method of manufacturing the outer seal portion S1 will be described with respect to the case of the lower bag body 2. First, as shown in FIG. 5A, the vulcanized rubber bag body 2, the vulcanized rubber first sealing material 10 (rubber magnet R), and the unvulcanized first and second rubber sheets 18, A preparatory step is performed in which 19 is aligned with the outer edge 2a of the bag body 2 and prepared.

Next, as shown in FIG. 5B, the outer edge portion 2a, the second rubber sheet 19, the first rubber sheet 18, and the first sealing material 10 are stacked on top of each other from the bottom to the top, and then vertically (laminated direction). ) Is pressurized and vulcanized. That is, the second rubber sheet 19 is adjacent to the same EPDM outer edge portion 2a, and the first rubber sheet 18 is adjacent to the same NBR first sealing material 10 and is laminated. 14 is sandwiched between the first sealing material 10 and the outer edge portion 2a by vulcanization adhesion.

By vulcanization, the outer edge portion 2a and the second rubber sheet 19 are vulcanized and bonded, the second rubber sheet 19 and the first rubber sheet 18 are vulcanized and bonded, and the first rubber sheet 18 and the first sealing material 10 are combined. As a result, the outer edge portion 2a and the first sealing material 10 are vulcanized and bonded well, and it is possible to firmly integrate them.

The first sealing material 10 which is a rubber magnet R is obtained by kneading ferrite powder into NBR and magnetizing it, and has excellent wear resistance while maintaining a strong magnetic force that hardly drops even at a high vulcanization temperature. Suitable as a sealing material. When this is vulcanized and adhered to the outer edge portion 2a of the bag body 2, the bag body 2 is made of EPDM and the type of rubber is different from that of NBR, which is the material of the first sealing material 10, so that it does not adhere well.

Therefore, when the first sealing material 10 and the outer edge portion 2a are vulcanized using only the first rubber sheet 18 made of NBR, the first sealing material 10 and the first rubber sheet 18 are vulcanized and adhered well. It was found that the first rubber sheet 18 and the outer edge portion 2a, which are different types of rubber from each other, are easily peeled off. Further, when the first sealing material 10 and the outer edge portion 2a are vulcanized using only the second rubber sheet 19 made of EPDM, the second rubber sheet 19 and the outer edge portion 2a are vulcanized and adhered to each other. It was found that the first sealing material 10 and the second rubber sheet 19 having different types of rubber are easily peeled off.

Then, the adhesive rubber layer 14 is formed by a first rubber sheet 18 made of first-class rubber, which is a material of the sealing material 10, and a second rubber sheet 19 made of second-class rubber, which is a material of the outer edge portion 2a. 1 The rubber sheet 18 was laminated and formed so as to be adjacent to the sealing material 10 (the second rubber sheet 19 was adjacent to the outer edge portion 2a) and vulcanized and adhered. Then, it was found that the first rubber sheet and the second rubber sheet 19 were vulcanized and adhered well, and as a result, the bag body 2 and the first seal member 10 were vulcanized and adhered well without peeling off and integrated. It was done.

The outer edge portion 3a of the upper bag body 3 and the second sealing material 11 are also vulcanized by sandwiching an adhesive rubber layer 14 formed by laminating the first rubber sheet 18 and the second rubber sheet 19 by the same structure and manufacturing method. Therefore, it is vulcanized and adhered well.

[Another Embodiment]
The molded bag 1 having the seal portion S formed only by the outer seal portion S1 may be used. In this case, it is further preferable to use the sealing materials 10 and 11 using rubber having a hardness slightly smaller (softer) than the outer sealing portion S1 according to the first embodiment.

In the outer sealing portion S1 (seal portion S), one sealing material 10 is a rubber magnet R, and the other sealing material 11 has iron powder or nickel powder kneaded into rubber or has flexibility. It may be made of a material such as a metal plate which does not have a magnetic force but can be magnetized.

2 One bag body 2a Outer edge 3 The other bag body 3a Outer edge 10 1st sealing material 11 2nd sealing material 14 Adhesive rubber layer 18 1st rubber sheet 19 2nd rubber sheet K opening R rubber magnet

Claims (5)

An opening structure of a laminated glass molded bag having a pair of bag bodies and an opening formed by the outer edges of the bag body and capable of switching between an open state and a closed state.
A sealing material made of a material different from the material of the bag body is provided on at least one of the outer edge portions, and the closed state of the opening is due to the contact between the sealing material or the outer edge portion and the sealing material, and The open state of the opening is formed by releasing the contact between the sealing material or the outer edge portion and the sealing material.
The sealing material and the outer edge portion are integrated between them by vulcanization adhesion via an adhesive rubber layer.
In the adhesive rubber layer, a first rubber sheet made of first-class rubber, which is a material for the sealing material, and a second rubber sheet made of second-class rubber, which is a material for the outer edge portion, form the first rubber sheet. An opening structure of a laminated glass molding bag formed by laminating the seal material adjacent to the sealing material. The sealing material is provided on each of the pair of outer edge portions, and at least one of the two sealing materials is a rubber magnet.
The opening structure of a laminated glass molding bag according to claim 1, wherein both sealing materials are magnetically bonded to each other when the opening is closed. The opening structure of a laminated glass molding bag according to claim 2, wherein the rubber material of the rubber magnet is set to NBR and the material of the second rubber sheet is set to EPDM. The opening structure of a laminated glass molding bag according to claim 2 or 3, wherein the rubber magnet is formed by mixing ferrite powder into rubber. The opening structure of a laminated glass molding bag according to any one of claims 2 to 4, wherein the pair of the sealing materials are both made of a rubber magnet.

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