JP6959100B2 - Manufacturing method of pulling cloth for molding bag - Google Patents

Description

The present invention relates to a method for producing a pulling cloth used for a laminated glass molding bag used for manufacturing glass for building materials, an automobile windshield, and the like, that is, a method for manufacturing a pulling cloth for a molding bag.

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.

The process of manufacturing laminated glass is continuously performed on the running line. That is, as soon as the laminated glass is taken out from the molding bag after the heating, suction, and pressurizing steps of the unbonded glass plate put in the molding bag are completed, the next unbonded glass plate is put into the molding bag and described above. The same process is performed as above, and the molded bag is used repeatedly. In order to proceed efficiently in the manufacturing process, it is important to perform decompression by suction, that is, evacuation, which occupies most of the work, smoothly and quickly.

As a conventional means for evacuating a molded bag, as disclosed in Patent Document 1, a suction nozzle (see “S” in FIG. 2) that communicates with the inside of the bag is provided, and air is evacuated from the suction nozzle. Met.
Further, as disclosed in Patent Document 2, a rope facing the suction port of the suction nozzle is arranged inside the bag, and a slight gap formed between the bag body and the rope during evacuation is formed in the air passage. In some cases, it was possible to evacuate with a lower pressure.

Japanese Unexamined Patent Publication No. 2006-182581 Japanese Unexamined Patent Publication No. 2004-08293

It has been found that the molded bag of Patent Document 2 provided with a rope inside the bag can be evacuated better than the molded bag of Patent Document 1 provided with a suction nozzle.
However, when evacuated, the pair of bag bodies firmly cling to each other due to decompression, which causes air pools to be formed in various places, but it was not possible to completely evacuate from those air pools.

An object of the present invention is for a molding bag which is improved by further diligent research so that the air from the molding bag can be evacuated more smoothly, the pressure can be reduced closer to the vacuum, and the vacuuming operation can be made more efficient. The point is to provide a method for manufacturing a pulling cloth.

The present invention relates to a method for manufacturing a pulling cloth for a molded bag used for a laminated glass molding bag having bag bodies 2 and 3 having openings K that can be opened and closed.
The vulcanized cloth 4 used for the bag bodies 2 and 3 is vulcanized by being wound around a heating drum 21 in a state where the groove-forming cloth 20 made of synthetic resin threads is stacked on the inner surface of the unvulcanized cloth. do.

The second aspect of the present invention is characterized in that a plain-woven cloth is used as the groove-forming cloth 20 in the method for producing a pulling cloth for a molding bag according to the present invention.

The invention of claim 3 is the second method of manufacturing a pulling cloth for a molding bag according to the present invention.
As the groove forming cloth 20, a cloth having a base cloth 20A made of a thin first thread 20a and a net cloth 20B made of a second thread 20b thicker than the first thread 20a and coarser than the base cloth 20A is used. And.

The invention of claim 4 is the third method of manufacturing a pulling cloth for a molding bag according to the present invention.
A nylon thread is used for the first thread 20a, and a PE thread is used for the second thread 20b.

The invention of claim 5 is the method for producing a pulling cloth for a molded bag according to any one of the first to fourth aspects of the present invention.
The pulling cloth 4 is characterized in that a film made of a fluororesin is pressure-bonded to the inner surface thereof.

According to the present invention, the unvulcanized cloth for the bag body and the groove-forming cloth are overlapped and wound around a heating drum for vulcanization. A cloth-shaped groove will be formed. As for the bag body, the groove formed on the inner surface serves as an air passage, and air can be evacuated regardless of the position inside the bag body by decompression from the suction nozzle, which is better without forming an air pool. You will be able to evacuate.
Then, as a method of forming a groove in the bag body, an unvulcanized pulling cloth is wound around a heating drum in a state where the groove-forming cloth is overlapped on the inner side surface thereof and vulcanized. It is possible to form a groove inexpensively and efficiently by using the existing equipment without adding a new method for the purpose.

As a result, the air from the molding bag can be evacuated more smoothly, the pressure can be reduced closer to the vacuum, and the bag pulling cloth is improved so that the efficiency of the vacuuming operation can be improved, and its excellent molding. It is possible to provide a manufacturing method capable of efficiently and inexpensively producing a bag pulling cloth.

Top view of a molded bag for laminated glass A plane showing the open state of the molding bag of FIG. AA cross-sectional view of FIG. 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 Schematic diagram showing the schematic structure of a continuous press vulcanization facility (A) Plan view showing the groove-forming cloth, (b) Plan view showing the inner side surface of the bag body.

Hereinafter, embodiments of a method for manufacturing a molded bag for laminated glass and a pulling cloth for a molded bag according to the present invention will be described with reference to the drawings.

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 edge portions 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, and 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 close contact is released. ..

Only the bottom, which is the long side of each other's root side, is integrated into the bag bodies 2 and 3, 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) 4, that is, pulling cloth for a molding bag (hereinafter, simply abbreviated as pulling cloth) 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. May be. The pulling cloth 4 may be referred to as a rubber pulling cloth 4.
As the main body cloths 2A and 3A, a pulling cloth 4 (a pulling cloth 4 with a film sheet 5) to which a film sheet (an example of a film) 5 made of fluororesin is crimped is used on the inner surface side, and the opening cloths 2B and 3B are connected. The cloths 2C and 3C consist only of the pulling cloth 4.

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 bag body 2 which is the lower side when used as the molding bag 1. .. The loop-shaped 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 (pulling cloth 4), but may be made of other materials.

As shown in FIGS. 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 includes 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 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 sealing materials 10 and 11 are 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 seal portion S1 has a configuration in which the first seal material 10 and the second seal material 11 are magnetically adhered to each other by magnetic force, whereby the first and second outer surfaces 10A and 11A are in close contact with each other, whereby the opening K is formed. The closed state 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 EPDM and formed in a strip shape having a flat rectangular cross section, and are attached to the bag bodies 2 and 3 immediately inside (about 5 mm apart) of the corresponding sealing materials 10 and 11. Has been done. The sealing members 12 and 13 are attached to the bag bodies 2 and 3 by an adhesive rubber layer 17 (by vulcanization adhesion).

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. 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 satisfactorily only by the inner sealing portion S2. Has been done.

As shown in FIGS. 4A and 4B, 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, 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 integrated with each other. Therefore, when the molding bag 1 is opened wide, as shown in FIG. 4B, the bag is set with the ends of the first and second base ends 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 by 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. In short, it is sufficient to simply cover the upper bag body 3 with 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 so that the inner seal portion S2 is in a completely adhered and sealed state. The function 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 acting as a molding bag 1 (during heating and pressurizing) when the inside of the bag is depressurized close to vacuum, sufficient sealing property is exhibited substantially 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 is a pair of glasses. The polymer film existing between them is also degassed, and the laminated glass G is firmly integrated.

As described above, in the molded bag 1 according to the present invention, the seal portions S formed by the outer and inner seal portions S1 and S2 are flat surfaces of the outer surfaces 10A and 11A and the upper surfaces 12A and 13A. It is composed of the contact of. Therefore, in order to close the molded bag 1, it is sufficient to cover the upper bag body 3 with the lower bag body 2 so that the outer lines overlap each other, and a simple, labor-free and time-saving closing operation is realized. ing.

The sealing portion S is required to have good sealing performance at the start of evacuation and excellent sealing performance to withstand negative pressure due to decompression. Since the outer seal portion S1 is magnetically adhered to each other by simply overlapping the first and second seal materials 10 and 11 which are rubber magnets R, the outer seal portion S1 is sufficiently airtight even when the inside of the bag is not depressurized such as atmospheric pressure. The state is maintained, and the vacuum is quickly drawn without the initial leakage at the start of decompression. Then, when the pressure is reduced to some extent, the first sealing material 10 and the second sealing material 11 are more firmly adhered to each other due to the negative pressure, and the outer sealing portion S1 can exhibit excellent sealing properties. Therefore, even the seal portion S having only the outer seal portion S1 can exhibit sufficient sealing performance.

In the seal part of the outer edge of the bag in the conventional molded bag, the adhesion is not perfect, it takes a long time to evacuate, and many clips are often used together to improve the adhesion, so workability and work The production efficiency was not good. The molded bag according to the present invention has the effect of improving the adhesion of the sealing portion without using a clip and improving the vacuuming operation so that the vacuuming operation can be performed efficiently and easily.

In the molding bag 1 shown in FIGS. 1 and 2, since the inner sealing portion S2 having a smaller rubber hardness than the outer sealing portion S1 and having better adhesion is also provided, leakage is almost completely eliminated and molding is performed. While realizing a simple opening and closing operation of the bag 1, it is possible to evacuate more efficiently.

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 is made by kneading iron powder or nickel powder into rubber or has flexibility. It may be made of a material that does not have magnetic force such as a metal plate but can be magnetized.

Next, the pulling cloth 4 for the main body cloths 2A and 3A and the manufacturing method thereof will be described in detail. As shown in FIG. 2, in the main body cloths 2A and 3A, as described above, a fluororesin film sheet 5 is crimped to the inner side surface of the pulling cloth 4, and the inner side surface thereof is evacuated. A cross-shaped groove m is formed to improve the passage of air. The groove m is produced by pressing the groove forming cloth 20 against the film sheet 5 which is the inner side surface of the bag bodies 2 and 3 and vulcanizing it.

FIG. 6 shows an explanatory diagram of a vulcanization method for the pulling cloth 4 for the main body cloths 2A and 3A. That is, a continuous press vulcanization facility P composed of a steel belt 22, a heating drum 21, and first to third rolling rollers 23 to 25 is configured, and the bag body 2 and the bag body 2 are configured by using the continuous press vulcanization facility P. Most of the vulcanization of 3 is performed. That is, the pulling cloth 4 for the molding bag 1 (for the bag bodies 2 and 3) is synthesized with the unvulcanized pulling cloth 4'(the unvulcanized cloth 4') before vulcanization with the film sheet 5. It is produced by vulcanizing a groove-forming cloth 20 made of resin threads by winding the groove-forming cloth 20 on the inner side surface of the film sheet 5 and transporting it around a heating drum 21.

As shown in FIG. 6, the unvulcanized pulling cloth 4', which is a secondary laminate, is sent to the first rolling roller 23 together with the groove forming cloth 20 and is sandwiched between the steel belt 22 and the heating drum 21. By heating, the unvulcanized rubber is vulcanized into a pulling cloth 4, and a vertical and horizontal cross-shaped groove m is formed on the inner side surface of the film sheet 5 pressed by the groove forming cloth 20.
Then, the pulling cloth 4 having the groove m formed inside is wound away from the continuous press vulcanization facility P by a winding device (not shown), and the groove-forming cloth 20 passes through a device (not shown) to the original position, that is, the first position. 1 Return to the position toward the rolling roller 23. The vulcanization of the opening cloths 2B and 3B and the pulling cloth 4 for the connecting cloths 2C and 3C can be performed by putting only the unvulcanized pulling cloth 4'into the continuous press vulcanization facility P.

As shown in FIG. 7A, the groove-forming cloth 20 is made of a base cloth 20A made of a first thread 20a made of a thin nylon thread and a second thread 20b made of a PE (polyethylene) thread and thicker than the first thread 20a. It is formed on a plain woven cloth having a net cloth 20B. The net cloth 20B has a coarser mesh than the base cloth 20A, and the net cloth 20B mainly forms grooves m on the inner side surfaces of the bag bodies 2 and 3.

The grooves m of the bag bodies 2 and 3 are air grooves that can function as air passages, and as shown in FIG. 7 (b), the thick groove 27 by the second thread 20b and the thin groove m by the first thread 20a. It is formed with a groove 26. Continuous press vulcanization equipment P (belt type vulcanization) in which an unvulcanized bag body and a plain-woven synthetic resin groove-forming cloth are overlapped with the groove-forming cloth facing the inner surface of the bag body. By adopting the manufacturing method of feeding into the machine), it has become possible to quickly and efficiently form a groove for passing air on the inner surface of the bag.

In the structure in which the rope is arranged on the outer peripheral portion inside the bag (Patent Document 2), the vacuum degree around the rope is high, but there is a problem that the decompression is insufficient in the central portion of the bag and the vacuum degree tends to be low. Therefore, in the present invention, a groove m serving as an air passage is provided on the inner surface of the bag, and air can be evacuated by depressurizing from the suction nozzle 9 regardless of the internal positions of the bag bodies 2 and 3, and the air can be evacuated evenly. It has the advantage of being able to evacuate.

[Another Embodiment]
The groove forming cloth 20 is wound on the heating drum 21 together with the pulling cloth 4 (including both with and without the film sheet 5) by a vulcanization method (continuous press vulcanization equipment P), and the groove m is formed on the inner surface of the pulling cloth 4. The type, weaving method, and knitting method of the fibers used in the groove-forming cloth 20 can be variously changed and set.
The crimping of the pulling cloth 4 and the film 5 is performed in the continuous press vulcanization equipment P shown in FIG. 6, but the film 5 may be integrated with the pulling cloth 4 in advance. Further, the film 5 may be laminated on the inner surface side of the pulling cloth 4, and may be integrated by means other than crimping, such as vulcanization or adhesion.

2 One bag body 3 The other bag body 4 Bag cloth (pull cloth for molding bag)
5 Fluororesin film sheet 20 Grooving cloth 20A Base cloth 20B Net cloth 20a First thread 20b Second thread 21 Heating drum

Claims (5)

A method for manufacturing a pulling cloth for a molded bag used for a laminated glass molding bag having a bag body having an opening and closing opening.
A method for producing a pulling cloth for a molded bag, in which a groove-forming cloth made of synthetic resin threads is placed on the inner surface of an unvulcanized pulling cloth used for the bag body, wound around a heating drum, and conveyed for vulcanization. The method for producing a pulling cloth for a molding bag according to claim 1, wherein a plain-woven cloth is used as the groove-forming cloth. The drawing for a molding bag according to claim 2, wherein as the groove-forming cloth, a cloth having a base cloth made of a thin first thread and a net cloth made of a second thread thicker than the first thread and having a coarser mesh than the base cloth is used. How to make cloth. The method for producing a pulling cloth for a molding bag according to claim 3, wherein a nylon thread is used as the first thread and a PE thread is used as the second thread.

The method for producing a pulling cloth for a molding bag according to any one of claims 1 to 4, wherein a cloth made of fluorine tree is pressure-bonded to the inner surface thereof as the pulling cloth.

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