JP2018203594A - Aperture structure of molding bag for glass laminate - Google Patents

Abstract

The present invention provides an opening structure of a molded bag for laminated glass which is improved so that opening and closing operations of a molded bag can be performed more quickly than before without losing good airtightness when closed.
In an opening structure of a molded glass bag for laminated glass, the outer edge portion 2a is formed by the outer edge portions 2a, 3a of a pair of bag bodies 2, 3 and has an opening K that can be switched between an open state and a closed state. Is provided with a sealing material 10 made of a material different from the material of the bag body 2, and the closed state of the opening K is due to contact between the sealing materials 10, and the sealing material 10 and the outer edge portion 2 a 2a is integrated by vulcanization adhesion via an adhesive rubber layer 14, and the adhesive rubber layer 14 is composed of a first rubber sheet 18 made of a first type rubber, which is a material of the sealing material 10, and an outer edge portion 2a. A second rubber sheet 19 made of a second type rubber, which is a material, is formed by laminating the first rubber sheet 18 adjacent to the sealing material 10.
[Selection] Figure 4

Description

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

  In the windshield of automobiles and window glass of high-rise buildings, laminated glass is used in which broken pieces do not scatter when broken. Laminated glass is a glass with a structure in which a glass film and a glass plate are provided with a heat-meltable polymer film such as polyvinyl butyral. It is.

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

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

  When the laminated glass is taken out of the molded bag after the heating, suction, and pressurizing steps of the unbonded glass plate placed in the molded bag, the next unbonded glass plate is formed into the molded bag. The same process as described above is performed, and the molded bag is used repeatedly. In order to advance the production process efficiently, it is important to smoothly and quickly perform decompression by vacuum, that is, evacuation, which occupies most of the work, and for this purpose, quick closing operation of the opening and reliable operation in the closed state are important. High adhesion (air tightness) is required.

As a conventional structure of the opening for opening and closing the molded bag, as disclosed in Patent Document 1, there is a means for providing a continuous airtight fastener at each opening edge of the bag.
Further, as disclosed in Patent Document 2, means using a sealing member formed by distributing and arranging a ridge extending along the opening and a ridge that can be engaged with the ridge to a pair of bag bodies. There is also.

JP 2003-321257 A JP 2006-182581 A

  In the structure of the opening using the airtight fastener disclosed in Patent Document 1, since a considerable force is required to open and close the structure for providing airtightness, it takes time and labor to open and close the molded bag. there were.

  In the structure in which the seal member disclosed in Patent Document 2 is used for the opening, since a series of ridges and ridges are sequentially pushed in from the end and engaged, considerable work and time are required for the operation. It takes. In addition, there are problems such as the protrusions and recesses being slightly deformed in length due to the engaging operation while being handled strongly, and they do not match well, the engagement is easily disengaged, and foreign objects are easily caught. Yes, it was not an easy task.

  The object of the present invention is to further improve the opening structure of a molded bag for laminated glass so that the opening and closing operation of the molded bag can be performed more quickly than before without losing good airtightness when closed. The point is to provide.

The present invention includes a pair of bag main bodies 2 and 3 and an opening K that is formed by outer edge portions 2a and 3a of the bag main bodies 2 and 3 and can be switched between an open state and a closed state. In the opening structure of the molded bag for laminated glass,
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 state with the material 10, and the open state of the opening K is due to the contact material between the seal material 11 or the outer edge 3a and the seal material 10 is released,
The sealing material 10 and the outer edge portion 2a are integrated by vulcanization adhesion through an adhesive rubber layer 14 between these two 10 and 2a,
The adhesive rubber layer 14 includes a first rubber sheet 18 made of a first type rubber that is a material of the sealing material 10 and a second rubber sheet 19 made of a second type rubber that is a material of the outer edge portion 2a. The first rubber sheet 18 is formed by being laminated adjacent to the sealing material 10.

2nd this invention, in the opening part structure of the formation bag for laminated glass by this 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 configured to be magnetized.

According to a third aspect of the present invention, in the opening structure of the molded bag for laminated glass according to the second aspect of the present 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.

4th this invention is the opening part structure of the shaping | molding bag for laminated glasses by 2nd or 3rd this invention,
The rubber magnet R is characterized in that ferrite powder is mixed with rubber.

5th this invention, in the opening part structure of the shaping | molding bag for laminated glasses by 2nd-4th this invention,
The pair of sealing materials 10 and 11 are both composed of rubber magnets R.

  According to the present invention, since the sealing material is provided in the opening of the bag body, it is possible to improve the sealing property (airtightness) of the molded bag when closed. Since the rubber material of the sealing material is different from the rubber material of the bag body (outer edge), the bag body uses a rubber material with excellent strength, and the sealing material uses a material with excellent adhesion and wear resistance. Thus, there is an advantage that a suitable material can be set for each of the bag body and the sealing material.

The bag body and the sealing material, which are different from each other in rubber material, cannot be well vulcanized and bonded. However, the bonding is made by laminating the first rubber sheet made of the sealing material and the second rubber sheet made of the outer edge material. It has been found that when the rubber layer is sandwiched between the first rubber sheet and the sealing material and vulcanized, the bag body and the sealing material can be integrated well.
As a result, it is possible to provide an opening structure of a molded bag for laminated glass which is improved so that the opening / closing operation of the molded bag can be performed more quickly than before without impairing good airtightness when closed.

According to the second aspect of the present invention, when the first sealing material and the second sealing material are relatively brought closer to each other, the two sealing materials are magnetically attached to each other by magnetic force when approached to a certain degree. .
In other words, 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 sufficient. 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 continued. In order to open the opening, the first sealing material and the second sealing material need only be peeled off, that is, the outer edge of the bag body may be separated.
Therefore, the opening / closing operation can be quickly performed without impairing the favorable airtightness in the closed state of the opening, and a more improved opening structure of a laminated bag for laminated glass can be provided.

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

  According to the fourth aspect of the present invention, since ferrite powder is used as a magnetic material to be kneaded with rubber, it can withstand a heat treatment such as vulcanization while exhibiting a good magnetic force, and the magnetic force does not drop even at a high temperature. There is an effect that it is possible to provide a rubber magnet suitable for a molded bag that performs heating and pressurization.

  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 is a rubber magnet, and better sealing performance is obtained. An opening structure of a molded bag can be provided.

Plan view of molded glass bag Plane showing the opened state of the molding bag of FIG. AA sectional view of FIG. Sectional view of the main part showing the structure of the opening The method of integrating the sealing material and the outer edge part is shown, (a) is a preparation step, (b) is a vulcanization step. 1 is a cross-sectional view taken along line B-B in FIG. 1, (a) in a closed state, (b) in an open state An enlarged plan view of the main part showing the structure near the suction nozzle

  Below, embodiment of the opening part structure of the shaping | molding bag for laminated glasses by this invention is described, referring to drawings as what is used for manufacture of the laminated glass etc. for building materials.

  As shown in FIGS. 1 and 2, the molded bag (molded bag for laminated glass) 1 is formed by a pair of bag main bodies 2 and 3 and outer edge portions 2 a and 3 a of the bag main bodies 2 and 3 and is in an open state. And an opening K that can be switched to a closed state, and a seal portion S that can be switched between 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 provided in the vicinity of the inner side of the outer seal portion S1.

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

The bag bodies 2 and 3 are integrated only at the bottom, which is the long side of the base side of each other, and almost the entire region of the front side and the short sides of each bag body 2 and 3, that is, three sides Opened so that it can be opened and closed.
The forming bag 1 has a front end opening Ks which is a long side portion on the front end side, and one side and other side openings Ki and Kt which are open except for the end portion on the base side and which are both short side portions. That is, the molded bag 1 having a rectangular shape as a whole has an opening K (Ki, Ks, Kt) that can be opened and closed in three of the four directions.

  As shown in FIG. 1 to FIG. 3, the bag bodies 2 and 3 are made of an EPDM laminated fabric (ethylene propylene rubber laminated) having a front rubber layer and a back rubber layer laminated with ethylene propylene rubber on both sides of the polyester fiber cloth. Cloth). Each of the bag bodies 2 and 3 is configured by connecting and integrating the opening cloths 2B and 3B around the main body cloths 2A and 3A using the connecting cloths 2C and 3C. It is good. A film sheet 5 made of a fluororesin is pressure-bonded to at least the surface (main body cloth 2A, 3A) on the inner surface side of the bag main bodies 2 and 3. The material of the bag bodies 2 and 3 is preferably EPDM, but may be other than EPDM such as CR (chloroprene), fluorine rubber, and acrylic rubber.

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

  As shown in FIGS. 1 to 3 and 7, the twisted rope 7 is formed by arranging one rope in a loop shape in the molded bag 1, and both rope ends 7 a and 7 b are sucked. The both ends of the proximal end pipe 6 of the nozzle 9 are locked by using an insulation lock 16 or the like. The suction nozzle 9 includes a nozzle main body portion 9A having a proximal end pipe 6 and a nozzle portion 9B that projects laterally from the nozzle main body portion 9A.

  As shown in FIGS. 2 and 3, the outer seal portion S <b> 1 includes a first seal member 10 attached to the outer edge portion 2 a of one bag body 2 on the lower side and the other bag body 3 on the upper side. And a second seal member 11 attached to the outer edge 3a. 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 and magnetized with NBR (nitrile rubber) and has a flat rectangular cross section. It forms in strip | belt shape and is attached to the inner surface of outer edge part 2a, 3a of the corresponding bag main bodies 2 and 3. The hardness of the NBR forming the sealing materials 10 and 11 is desirably 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 seal portion S1, the state in which the outer surfaces 10A and 11A of the respective sealing materials 10 and 11 are in close contact with each other is the closed state of the opening K, 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 seal portion S1 has a configuration in which the first seal material 10 and the second seal material 11 are magnetically attached by a magnetic force, whereby the first and second outer surfaces 10A and 11A are in close contact with each other. Thus, 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 to the N pole, and the other is magnetized to the S pole.

  As shown in FIGS. 2 and 3, the inner seal portion S <b> 2 includes 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. A second seal member 13 attached to the other bag body 3 is provided in the vicinity. The first and second seal members are both made of rubber (synthetic rubber), more specifically, made of EPDM and formed in a strip shape having a flat rectangular cross section, and immediately inside the corresponding seal materials 10 and 11 (5 mm). It is attached to the bag bodies 2 and 3 at a certain distance. The hardness of EPDM forming the seal members 12 and 13 is desirably 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 state in which the upper surfaces 12A and 13A of the seal members 12 and 13 are in close contact with each other is the closed state of the opening K, 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 first and second seal members 12 and 13 are set to be softer than the first and second seal members 10 and 11, so that the upper surfaces 12A and 13A are simply brought into contact with each other without any gaps. It is configured such that a small amount of surface contact is obtained and a good sealing state is 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, the first and second sealing materials 10 and 11 are firmly adhered to each other without a gap, and the closed state of the opening K can be satisfactorily maintained only by the inner seal portion S2. Has been.

  As shown in FIGS. 6A and 6B, the first and second sealing materials 10 and 11 are connected to the bag main bodies 2 and 3, that is, at the bottom part that is the long side part of each other. It is integrated over a certain width. That is, the adhesive rubber layer 14 (by vulcanization adhesion) is configured to have a first base end portion 10B and a second base end portion 11B that are integrated with each other. Therefore, when the molding bag 1 is opened greatly, as shown in FIG. 6B, the end of the first and second base end portions 10B and 11B (end on the end opening Ks side) is used as a virtual fulcrum. The main bodies 2 and 3 are opened and swung.

  Next, the point of the heating and pressurization by the molding bag 1 is demonstrated. When the laminated glass G (see FIG. 1) is put into the opened molding bag 1 shown in FIG. 2, the upper bag body 3 is held and the lower bag body 2 is covered. In this covering operation, the second seal member 11 is changed to the first seal member 10 and the second seal member 13 is changed to the first seal member 12 in each of the front end opening Ks, the one side and the other side openings Ki, Kt. It is an operation that covers each position. In short, the upper bag body 3 may simply be placed over the lower bag body 2 so that the outlines of the bag bodies 2 and 3 match in the vertical direction.

  After the bag bodies 2 and 3 are put together and all the openings Ki, Ks, Kt are closed, and the molded bag 1 is sealed, the air in the molded bag 1 is extracted from the suction nozzle 9 by a pump (not shown) to reduce the pressure. A vacuuming process is performed. At the start of this evacuation step, 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 from the outside is removed. It is depressurized quickly without inhaling.

  When the air is extracted to some extent and the air pressure in the bag is lowered, the contact force between the first upper surface 12A and the second upper surface 13A is increased, and the function of the inner seal portion S2 is brought into a completely sealed state. Is started. That is, the inner seal portion S2 is set so as to exhibit excellent sealing performance by an adhesion force stronger than that of the outer seal portion S1. Therefore, at the time of the action as the molded bag 1 when the inside of the bag is depressurized close to vacuum (at the time of heating and pressurizing), a sufficient sealing performance is substantially exhibited only by the inner seal portion S2, and the outer seal portion. It can be said that S1 has a function as a preliminary seal until the inner seal portion S2 performs a full-scale seal function.

  While the molding bag 1 is evacuated for a predetermined time, the molding bag 1 is heated to a predetermined high temperature by heating means (not shown) such as a heater. Accordingly, the laminated glass G (see FIG. 1) placed in the bag is pressed and heated strongly between the bag bodies 2 and 3 by the bag bodies 2 and 3, and a pair of glasses. The polymer film existing between them is also deaerated, 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 seal portion S <b> 1, the first and second sealing materials 10 and 11, which are NBR rubber magnets, and the EPDM bag main bodies 2 and 3 are bonded to each other with an adhesive rubber layer. 14 is integrated by vulcanization and adhesion. The adhesive rubber layer 14 includes a first rubber sheet 18 made of NBR (an example of a first type rubber) that is a material of the sealing materials 10 and 11, and an EPDM (an example of a second type rubber) that is a material of the outer edge portions 2a and 3a. The second rubber sheet 19 is formed in a two-layer structure in which the first rubber sheet 18 is laminated adjacent to the sealing materials 10 and 11.

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

  Next, as shown in FIG. 5B, the outer edge 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 bottom (stacking direction). ) Is heated while being pressurized and vulcanized. That is, the second rubber sheet 19 is adjacent to the same outer edge 2a made of EPDM, and the first rubber sheet 18 is laminated in the state of being adjacent to the same first NBR sealing material 10. 14, the first sealing material 10 and the outer edge 2 a are vulcanized and bonded.

  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 As a result, the outer edge portion 2a and the first sealing material 10 are satisfactorily vulcanized and can be firmly integrated.

  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 almost without dropping even at a high vulcanization temperature. Suitable as a sealing material. When this is vulcanized and bonded to the outer edge 2 a of the bag body 2, the bag body 2 is made of EPDM, and the type of rubber is different from that of the NBR that is the material of the first seal material 10, so it does not arrive well.

  Therefore, when the first sealing material 10 and the outer edge portion 2a are vulcanized using only the NBR first rubber sheet 18, the first sealing material 10 and the first rubber sheet 18 are well vulcanized and bonded. It has been found that the first rubber sheet 18 and the outer edge portion 2a, each having a different rubber type, are easily peeled off. When only the second rubber sheet 19 made of EPDM is used to vulcanize the first sealing material 10 and the outer edge 2a, the second rubber sheet 19 and the outer edge 2a are well vulcanized and bonded to each other. It turned out that the 1st sealing material 10 and the 2nd rubber sheet 19 from which the kind of rubber | gum differs are easy to peel off.

  The first rubber sheet 18 made of the first type rubber that is the material of the sealing material 10 and the second rubber sheet 19 made of the second type rubber that is the material of the outer edge portion 2a One rubber sheet 18 was laminated and formed in a state adjacent to the sealing material 10 (second rubber sheet 19 was adjacent to the outer edge 2a), and vulcanized and bonded. Then, the first rubber sheet and the second rubber sheet 19 are also well vulcanized and bonded, and as a result, the bag body 2 and the first seal member 10 are well vulcanized and bonded and integrated without peeling. It was done.

  The outer edge 3a of the upper bag body 3 and the second sealing material 11 are also vulcanized with the adhesive rubber layer 14 formed by laminating the first rubber sheet 18 and the second rubber sheet 19 in a similar structure and manufacturing method. Thus, the vulcanized adhesive is satisfactorily adhered.

[Another embodiment]
The molded bag 1 having the seal part S only by the outer seal part S1 may be used. In this case, it is better to use the sealing materials 10 and 11 using rubber (soft) whose hardness is slightly smaller than that of the outer seal portion S1 according to the first embodiment.

  The outer seal part S1 (seal part S) has one of the sealing materials 10 made of a rubber magnet R and the other sealing material 11 made of iron powder or nickel powder kneaded with rubber or has flexibility. The metal plate may be made of a material that does not have a magnetic force but can be magnetized.

2 one bag body 2a outer edge 3 other bag body 3a outer edge 10 first sealing material 11 second sealing material 14 adhesive rubber layer 18 first rubber sheet 19 second rubber sheet K opening R rubber magnet

Claims (5)

An opening structure of a molded bag for laminated glass having a pair of bag main bodies and an opening formed by outer edges of the bag main bodies and switchable 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 portion is formed by contact of the sealing material or the outer edge portion and the sealing material; and The open state of the opening portion is due to contact release between the sealing material or the outer edge portion and the sealing material,
The sealing material and the outer edge portion are integrated by vulcanization adhesion through an adhesive rubber layer between them,
The adhesive rubber layer includes a first rubber sheet made of a first type rubber that is a material of the sealing material, and a second rubber sheet made of a second type rubber that is a material of the outer edge portion. An opening structure of a laminated bag for laminated glass, which is formed by laminating in a state 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 sealing materials is a rubber magnet,
The opening structure of the molded bag for laminated glass according to claim 1, wherein the two sealing materials are magnetized when the opening is closed.   The opening structure of a molded bag for laminated glass 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 the molded bag for laminated glass according to claim 2 or 3, wherein the rubber magnet is formed by mixing ferrite powder with rubber.   The opening part structure of the shaping | molding bag for laminated glasses as described in any one of Claims 2-4 with which a pair of said sealing material is comprised with the rubber magnet.

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