JPH031813A - Bag member for water-bed and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent shearing force from being applied to a sealing edge to internal pressure and to apply no unnatural force to a connecting part between a main body sheet and a reinforcing sheet by sealing the turned around and overlapped portions formed at the respective corners of a bag member, applying the reinforcing sheet on a main body sheet face holding a sealing edge therebetween and welding only the peripheral edges thereof to form an air sack inside. CONSTITUTION:On a rise part forming a corner 4 between the front face 2 or the rear face of a bag member 1 and a side face 3, the sealing edge 12 protruding on the inner face thereof, of the turned around and overlapped part 11 of a sheet 8 is formed, on the outer face of the rise part forming the corner 4, a reinforcing sheet 5 is applied over two faces of the front face 2 including the corner 4 or the rear face and the side face 3. Only the peripheral edges thereof are welded air tightly to the main body sheet face of the bag member. Only the peripheral edges of the reinforcing member 5 are welded to the main body sheet face, thereby an air sack 6 being formed in the inner face side of the reinforcing sheet 5 and a fixed quantity of air being confined in the air sack 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waterbed bag formed by folding and welding a sheet material, and a method for manufacturing the same.

[Prior art] Waterbeds that use water as a cushioning body receive the weight of the human body uniformly over the entire surface of the contact surface regardless of the ups and downs of the human body while sleeping, so there is no pressure on any part of the body. On the other hand, there is no need to worry about pressure sores, and you can enjoy a comfortable night's sleep, and it has also come to be widely used as health bedding for both commercial and home use. Since waterbeds are bags filled with water, the watertightness and durability of the bags are important factors, and in terms of quality, they are now required to have durability close to that of regular spring beds. It's here.

A waterbed bag is made into a flat rectangular parallelepiped shaped like a pine tress by bending a watertight sheet material such as a synthetic resin sheet or a rubberized sheet and welding and sealing the folded ends of the joint. It is customary. An example is shown in FIG. A single sheet 21 with cutouts provided in advance at both ends of the portion forming the side surface portion was folded back to form both side surface portions and the bottom surface portion of the top surface portion 9, and the edges of each portion were further folded back to the front side and back side. In some cases, the parts to be welded and sealed are the joint parts w1 of both edges of the sheet-like material that are butted together at the center of the bottom surface, and the parts that are folded at right angles from the top and bottom sides of the rectangular parallelepiped and butted together, respectively. A joint W3 between the two folded edges, and a joint W3 between the rising edges of the folded end and the side edge. In particular, the joint W between the front or back surface and the side surface forms a corner of the bag body and generates a large stress against the load, so sufficient joint strength is required.

In order to increase the bonding strength, as shown in Fig. 10, apply the cloth 22 to the outer surface of the main body sheet 21 across the front or back side and the side surface, and weld the entire surface of the cloth to the sheet surface of the bag body for sealing. There are known ways to stop it.

[Problems to be Solved by the Invention] However, when the above method is used, the corners of the bag are covered with the cloth 2 welded to the sheet surface across the front or back and side surfaces.
However, at the corners of the bag, a step is formed between the surfaces of the cloth 22 and the main sheet 21, and the bag is repeatedly bent due to the vibrations, impacts, and water pressure that occur during use. There was a problem in that the difference in level between the cloth 22 and the seam surface became fatigued, and eventually cracks occurred, leading to damage. If the bag is damaged, the water filled inside the bag may leak out and cause a serious accident due to water leakage.

It is an object of the present invention to provide a bag for a water bed and a manufacturing method in which the joint structure of the bag corners is particularly improved.

[Means for Solving the Problems] In order to achieve the above object, the water bed bag according to the present invention has a water bed shaped into a flat rectangular parallelepiped by folding a sheet-like material and welding the folded butted ends. A sealing edge of the folded overlapping portion of the sheet material which protrudes from the inner surface of the rising portion of each corner of the bag body and is welded watertightly, and the rising portion 2 of the corner
The periphery is airtightly welded to the outer surface of the sheet material across the surface,
It has a reinforcing sheet that forms an air sac inside.

The bag for a water bed according to the present invention includes a process of folding a rectangular sheet-like material to form a flat square shape, welding the folded edges that abut each other to form a bag, and forming a bag at the corners of the bag. a process of welding and sealing the folded overlapping part formed at the rising part of the bag body in the rising direction of the bag; The bag is obtained by a manufacturing method including the steps of welding and sealing the periphery of a reinforcing sheet applied across the bag and forming an air sac inside the bag, and turning the bag upside down.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The waterbed bag according to the present invention has a flat rectangular parallelepiped shape similar to a pine tress by folding a watertight sheet material such as a synthetic resin sheet or a rubberized sheet and welding and sealing the mating edges of the sheet edges. This is the same as the conventional product. In the present invention, as shown in FIG.
At the rising portion forming the corner 4 between the front surface 2 or the rear surface and the side surface portion 3, as shown in FIG. A reinforcing sheet 5 is applied to the outer surface of the rising part forming the corner 4, spanning between the front 2 or the back surface and the side surface 3 including the corner 4, and only the periphery of the reinforcing sheet 5 is welded to the sheet surface airtightly. There is.

By welding only the peripheral portion of the reinforcing sheet 5 to the main sheet surface of the bag, the inner surface of the reinforcing sheet 5 can be confined. Note that a cushion material 7 such as urethane foam may be placed inside the air sac 6 as shown in FIG. This cushion has a function to adjust the amount of air that can be driven into the cushion.

Next, examples of the method for manufacturing a water bed bag according to the present invention will be described.

In FIG. 3, a watertight sheet 8 such as a synthetic resin sheet or a rubberized sheet is cut into a rectangular shape, and the sheet-like material 1 is cut into a rectangular shape.
Fold them in order as shown in Figure 4 to form two sides 99 and both sides 3.
．． By butting both edges of the sheet 8 forming the bottom surface 10 and forming the bottom surface 10, and further folding back the sheet portions at both ends of the top surface 9 and the bottom surface 10 by half the length of the rising height of the side surface 3, the front surface 2 and the bottom surface 10 are formed. A triangular folded overlapping portion +1 is formed on the rising portion of the side surface 3.

Next, each folded end is butted against each other, and the joint parts w,,w, are sequentially welded using a welder.Furthermore, the folded overlapping part II is welded in parallel to the direction of the rising surface, and the tip portion is removed to form a corner. A sealing edge 12 is formed at the folded overlapping portion 11 of the wafer.

Next, as shown in FIG. 5, the main body sheet surface is placed on the lower electrode 13 with the sealing edge of the folded overlapping part 11 in between, and the reinforcing sheet 5 made of the same material as the main body sheet 8 is placed on the upper surface. The upper electrode I4 is pressed down from above and the entire periphery of the reinforcing sheet 5 is thermally welded to the sheet 8 of the main body with a constant width. The important point in this step is to leave a margin between the sealing edge 12 of the folded overlapping portion 11 and the joint portion of the reinforcing sheet 5 as shown in the figure.

FIG. 6 shows the joining surface of the reinforcing sheet, and FIG. 7 shows the sealing edge 12 of the folded overlapping portion 11 protruding from the back side thereof. By joining the reinforcing sheet 5, an air pouch 6 covered with the reinforcing sheet 5 is formed at the corner 4 of the bag body 1 where the front or back surface and each side intersect, as shown in FIG. In addition, when welding the reinforcing sheet 5, the cushion material 7 such as urethane foam
The cushioning material 7 may be enclosed in the air sac 6 with the interposition of the air sac 6 as shown in FIG. 2.

The size of the front recorder 6 can be freely adjusted by setting the joining position of the reinforcing sheet 5. In the present invention, air sac 6
It utilizes the cushioning effect of the air trapped inside. The cushion material 7 inserted into the air sac 6 has a cushioning function in itself as well as regulating the amount of air enclosed.

Finally, turn over the bag body 1 with each corner closed, with the reinforcing sheet mounting surface at the corner facing the front side, and if there is an open part left due to the inversion, seal it by heat welding. ,
The waterbed bag 1 shown in FIG. 8 is completed. However, the step of welding the reinforcing sheet 5 may be performed after the bag is turned over. In this case, the electrodes contained within the bag can be taken out through a plug opened in a part of the bag l.

[Effects of the Invention] As described above, according to the present invention, the folded overlapping portions of the sheets formed at each corner of the bag are sealed, and a reinforcing sheet is applied to the main sheet surface across the sealing edges, Since only the periphery of the bag is welded to form an air sac inside, the bonding strength of the sealed rim is high, and when the bag is filled with water and installed in a bed frame, it will not absorb the load from the human body or other effects. Even if a force is applied, the shock is absorbed by the buffering effect of the air trapped in the air sac, and since the sealing edge of the folded overlapping part is folded inward, it is not sealed against internal pressure. Since no shearing force is applied to the toe edge and no strain is applied to the joint between the main body sheet and the reinforcing sheet, fatigue cracks do not occur and the durability can be significantly improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are enlarged partial views of main parts showing embodiments of the present invention, FIG. 3 is a plan view of a sheet used in the present invention, FIG. 4 is a diagram showing how to fold the sheet, and FIG. The figures show how to weld the reinforcing sheet, Fig. 6 shows how the reinforcing sheet is attached, Fig. 7 shows the protruding shape of the folded overlapping part, and Fig. 8 shows how the reinforcing sheet is welded.
FIG. 9 is a perspective view showing an example of a bag according to the present invention, FIG. 9 is a perspective view showing a conventional bag, and FIG.

Claims (2)

[Claims] (1) In a waterbed bag that is shaped into a flat rectangular parallelepiped by folding a sheet-like material and welding the ends of the folded back butts, the raised portions of each corner of the bag protrude from the inner surface and are welded watertightly. and a reinforcing sheet whose periphery is airtightly welded to the outer surface of the sheet-like material over two faces of the rising portion of the corner, and which forms an air sac inside. A waterbed bag body characterized by: (2) The process of folding a rectangular sheet to form a flat square shape and welding the folded edges that abut each other to form a bag; A step of welding and sealing the folded overlapping portion in the rising direction of the bag body, and a reinforcing sheet applied to the surface opposite to the surface from which the sealing edge of the folded overlapping portion protrudes, spanning between the two surfaces of the rising portion of the corner. 1. A waterbed bag comprising the steps of: welding and sealing the periphery of the bag and forming an air sac inside the bag; and turning the bag upside down.