JPH0345766Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a pressure bag used, for example, when press-molding skis.

[Technical background of the invention and its problems]

A ski is usually a multilayer structure made by polymerizing several strips, but when forming these skis, an adhesive is interposed between the strips, and pressure is applied from above and below the multilayer structure. It is heated and constructed in one piece. However, since skis have a curved part at one end, even if a ski molding mold with a shape that matches this curvature is used, it may be difficult to apply pressure uniformly over the entire body due to variations in the thickness of the strip. Giving is difficult. Therefore, conventionally the 9th
Pressure molding is carried out using a press bag as shown in FIGS. 1 and 10 and a press mold shown in FIG. 11. That is, 1 is a pressurized bag, which is composed of a rubber tube 2 and a jacket tube 3 provided on its outer surface. This pressurizing bag 1 has a flat shape as a whole, and both ends thereof are sealed by plates 4, 4, and an air chamber 5 is formed inside. Further, a nozzle 6 for supplying air into the air chamber 5 is provided in the longitudinally intermediate portion of the pressurized bag 1, and a plurality of mounting bolts 7 are provided on the upper surface of the pressurized bag 1. ing.

On the other hand, the press mold 8 includes a fixed mold 9 and a movable mold 1.
0, and curved portions 9a, 10a are provided at one longitudinal end of both dies 9, 10. The pressure bag 1 is attached to the lower surface of the movable mold 10 with attachment bolts 7. Therefore, one end of the pressure bag 1 is curved along the curved portion 10a of the movable mold 10. Further, 11 is a ski board as a molded object, which is made up of several strips and an adhesive interposed between them. The ski 11 has a curved portion 11a formed in advance at one end thereof.

When the ski 11 is pressure molded using the press mold 8, the ski 11 is placed on the fixed mold 9 with heaters 12, 12 attached to both the upper and lower surfaces. Then, the movable mold 1 is heated while heating the ski 11 by energizing the heaters 12, 12.
0 and press molds the ski 11. At this time, since the pressure bag 1 is attached to the lower surface of the movable mold 10, the pressing force of the movable mold 10 is uniformly applied to the entire ski 11.

However, since the pressure bag 1 is configured in a flat shape, the pressure bag 1 is attached to the movable mold 1.
When it is bent along the curved part 10a of the pressure bag 1, there is no difference between the circumferential length of the pressurizing bag 1 in contact with the fixed die 9 and the circumferential length in contact with the movable die 10, so that it is crushed at the curved part 10a as shown in FIG. 1a occurs, and this collapse 1a
This causes the inconvenience that the air chamber 5 is blocked. Therefore, the part of the ski 11 facing the collapsed part 1a of the pressure bag 1 receives a weaker pressing force than other parts, and the curved part 1, which is the most important part of the ski,
0a has the disadvantage that sufficient adhesive strength cannot be obtained. Further, the pressurized bag 1 is easily damaged at its collapsed portion 1a, and has the disadvantage of lack of durability.

[Purpose of invention]

This invention was made with attention to the above-mentioned circumstances, and its purpose is to be able to apply pressure uniformly even if the object to be molded has a curved part, such as a ski. The purpose is to provide pressurized bags.

[Summary of the idea]

In order to achieve this invention and the above-mentioned object, the outer surface of the elastomeric tube is covered with a jacket tube made of fibers, and a bag main body with both ends sealed, a curved part formed on the bag main body, an air supply port and It consists of a mounting tool.

[Example of idea]

An embodiment of this invention will be described below based on the drawings.

Figure 1 shows the method for manufacturing pressurized bags.
21 is a vulcanized rubber tube. Unvulcanized rubber is bonded to the outer surface of this lower vulcanized rubber tube 21. In this bonding step, the vulcanized rubber tube 21 is placed on an unvulcanized rubber sheet, and this vulcanized rubber tube 21 is bonded to the unvulcanized rubber. wrapped in a sheet,
After that, it is crimped using a hand roller. After the unvulcanized rubber sheet is bonded to the vulcanized rubber tube in this manner, it is drawn into the jacket tube 22. This jacket tube 22 is made of synthetic fiber such as nylon, and the rubber tube 22 is made of synthetic fiber such as nylon.
1 and a jacket tube 22 form a bag main body 23 having a double structure.

Next, sealing jigs 24, 24 are attached to both longitudinal ends of the bag main body 23, and the sealing jigs 24,
The bag main body 23 is sealed by the sealing jig 24, and a steam supply nozzle 25 is attached to one sealing jig 24. In this way, both ends are the sealing jig 24,
The bag main body 23 sealed with 24 is set in a preform vulcanization mold 26, and the bag main body 23 is vulcanized. This preform vulcanization mold 26 is
As shown in the figure and FIG. 3, the lower mold 27 and the upper mold 2
8 and a spacing plate 29 that holds both molds 27 and 28 at a constant distance. This lower mold 27 is provided with a rising portion 31 at one end of a flat plate-shaped lower mold main body 30, and this rising portion 31 has an arc-shaped curved portion 32 that is continuous with the upper surface 30a of the lower mold main body 30. It is formed. Also,
The upper die 28 is also provided with a rising portion 34 at one end of the upper die main body 33 which is in the form of a flat plate.
An arc-shaped curved portion 35 that is continuous with the lower surface 33a of the upper mold main body 33 is formed in the upper mold main body 33. The upper surface 30a and the lower surface 33a of the lower mold 27 and the upper mold 28 are opposed to each other, and the curved parts 32 and 35 are opposed to each other. Furthermore, this lower mold 27 and upper mold 28
is adapted to be clamped from above and below by a clamp mechanism 36, but both edges along the longitudinal direction between the lower mold 27 and the upper mold 28 are open.

Preform vulcanization mold 26 configured in this way
When curing the bag main body 23 using a
Place the bag body 23 on a. Then, one end of the bag main body 23 is placed along the curved portion 32.
Next, an upper mold 28 is placed on the upper surface of the bag main body 23, and the bag main body 23 is held between the lower mold 27 and the upper mold 28. At this time, the lower mold 27 and the upper mold 28
Since the distance between the bag main body 23 and the bag main body 23 is maintained constant by the spacing plates 29, even if the bag main body 23 is clamped from above and below by the clamp mechanism 36, the pressure applied to the bag main body 23 is uniform over the entire bag main body 23. Only the ears 23a, 23a are free. In this state, the bag main body 2 is supplied from the steam supply nozzle 25.
Air is supplied into the preform vulcanization mold 26 and the preform is blended by air pressure. Next, steam is supplied from the steam supply nozzle 25 to replace air so as not to reduce the pressure inside the bag main body 23. In this manner, when steam is supplied into the bag main body 23, the bag main body 23 expands due to the pressure, so that the bag main body 23 is vulcanized with its upper and lower surfaces in close contact with the lower mold 27 and the upper mold 28. Therefore, the curved portions 32, 3 of the lower mold 27 and the upper mold 28
On the lower surface side of the bag main body 23 located between the bag main body 23, unvulcanized rubber enters the texture of the jacket which has been stretched and enlarged, and is vulcanized and bonded in that state, and on the upper surface side, the excess jacket shrinks due to heat shrinkage, etc. Therefore,
A preform vulcanization mold 2 is attached to one end of the bag main body 23.
A curved portion 23b following the shape of 6 is molded. After vulcanization for a certain period of time in this manner, the bag body 23 is cooled by supplying cooling water from the steam supply nozzle 25 without reducing the pressure inside the bag body 23. Accordingly, a bag body 23 having a curved portion is obtained.

Next, the bag main body 23 is removed from the preform vulcanization mold 26, and the sealing jigs 24, 24 are removed from the bag main body 23. Then, as shown in FIGS. 4 to 8, mounting holes 37 are bored at predetermined positions on the upper surface of the bag main body 23, and one air supply port 38 and a plurality of mounting bolts 39 are mounted. Furthermore, after wiping the inner surfaces of both ends of the bag main body 23 with a solvent to remove the mold release agent, the adhesive sheet 4
0 is involved. Further, plates 41, 41 as sealing members are joined to the upper and lower surfaces of both ends of the bag main body 23 via adhesive sheets 40, 40. and,
These plates 41, 41 are connected by a fixing member 42 such as a bolt/nut, and both ends of the bag main body 23 are sealed.

Therefore, both ends of the bag main body 23 are sealed, forming a pressurized bag having a curved portion at one end, and this pressurized bag can be attached to the above-mentioned press-type movable mold 10 to press the ski. It can be used for molding.

[Effect of idea]

As explained above, according to this invention, the elastomer tube is covered with a jacket tube made of synthetic fibers, and the main body of the bag is provided with a curved portion, so that the molded object has a curved portion like a ski. It is possible to provide a pressurized bag that can be press-molded uniformly over the entire part without wrinkles or collapse because the main body of the bag has a shape that matches the curved part of the bag. It has the effect of being able to do it.

[Brief explanation of the drawing]

1 to 8 show one embodiment of this invention, and FIGS. 1 a to d are explanatory diagrams of the manufacturing method, and FIGS.
The figure is a side view of the preform vulcanization mold, FIG. 3 is a plan view, FIG. 4 is a side view of the molded pressure bag, FIG.
7 is a sectional view taken along the - line in FIG. 5, FIG. 8 is a sectional view taken along the - line in FIG. 5, and FIG. 9 is a side view of a conventional pressure bag. FIG. 10 is a plan view, FIG. 11 is an exploded side view of the press mold, and FIG. 12 is a side view of a conventional press bag in a collapsed state. 21... Elastomer tube, 22... Jacket tube, 23... Bag main body, 38... Air supply port.

Claims (1)

[Scope of utility model registration request] A pressurized bag characterized by having a jacket tube made of fibers coated on the outer surface of a tube-shaped elastomer, and comprising a bag main body with both ends sealed, a curved part formed on the bag main body, and an air supply port. .