JPH0473010A - Waterbed bag and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a welded joint part of an upper sheet and a lower sheet from being applied with unreasonable force in the use not to produce cracks and to improve durability by forming the upper sheet in a rectangle having an opening in a lower surface and sealing the lower surface opening by the lower sheet. CONSTITUTION:An upper sheet 1 is a rectangular sheet having a cutoff 2 at four corners which is formed by cutting both corners of each side at right angle and slantwise with a length of a rising part of a bag procured. A sheet surface of the upper sheet 1 is bent at right angle along a bending line which forms an edge of an upper surface part 3 and further a bottom edge part 5 attached to a rising part 4 is bent inside at right angle. Further, an end edge of the rising part 4 and its adjacent end edge of the bottom edge part 5 are welded and jointed to form a hollow rectangular parallelepiped having an opening 6 in a bottom surface and constituting a body of a bag 7. A lower sheet 9 is a rectangular sheet to seal the opening in the bottom surface of the bag 7. The lower sheet 9 is applied to the lower surface opening 6 of the rectangular parallelepiped which is formed by the formation of the upper sheet 1, and welded and jointed to a mouth edge of the rectangular parallelepiped, whereby the bag 7 is sealed and completely formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a waterbed bag formed using two sheets and a method for manufacturing the same.

[Prior art 1] A water bed is a mat that uses water as a cushion, and is used by filling a bag with water.
Watertightness and durability are important factors.

A watertight sheet such as a synthetic resin sheet or a rubberized sheet is used for the bag body of the water bed. conventionally,
A single watertight sheet cut into a predetermined shape is folded back and forth, left and right, and the left and right ends are folded back.

Generally, the front and rear folded ends are abutted against each other, and the abutted ends are welded and sealed together to form a flat rectangular parallelepiped like a pine tress. FIG. 6 shows the structure of a conventional waterbed bag. The bag 21 shown in FIG. 6 is made by folding a sheet 23 cut into a predetermined shape with cutouts 22 at key points as shown in FIG. The side view and bottom part are formed, the edges of each part are folded back to the front side and the back side, and the folded ends are butted and welded, but the parts to be welded and sealed are as follows.
As shown in Fig. 6, the joints W1 of both edges of the sheet butted together at the center of the bottom surface, and the joints of both folded edges folded at right angles from the top and bottom sides and butted on the front and back sides of the rectangular parallelepiped, respectively. a portion W, and a joint portion W between the rising both side edges of the folded end and the edge of the side surface portion. Then, as shown in Fig. 8, apply the cloth 24 to the outer surface of the joint W between the front or back surface and the side surface, which is the corner of the bag, and then apply the cloth 24 across the front surface (back surface) and the side surface. By gluing 24, the corners are reinforced.

The waterbed bag 21 is used by being housed in a box-shaped frame 25 with a bottom, as shown in FIG.

[Problem to be solved by the invention]

By the way, as the bag body 21 of the water bed is used for a long period of time, it deteriorates due to material fatigue of the welded joints, and cracks occur in the welded parts of the sheet surface, which grow, and eventually the sheet is cut. There is a problem that water leakage occurs. Material fatigue is caused by forces repeatedly applied from the outside, such as bending, stretching, and vibration on the sheet surface, and when joints are formed on the front and rear surfaces of the bag body 21, structurally, the external forces are less likely to be applied. The disadvantage is that it is susceptible to damage and therefore is susceptible to cutting due to material fatigue. Furthermore, it is unsightly when the joint is formed on a surface that is directly visible.

The object of the present invention is to use two sheets to form a bag body, and to join both sheets on the bottom side of the bag body which is to be seated on the floor of the frame, so that damage from the welded joint is less likely to occur. An object of the present invention is to provide a bag and a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above object, a waterbed bag according to the present invention has an upper sheet and a lower sheet, and is processed into a bag by welding both sheets together, and comprises: The sheet is made by bending each side of a rectangular watertight sheet with notches at the four corners to form the top surface, four rising edges, and a part of the bottom edge of the bag, and welding and joining the butt ends of each side. The bottom sheet is formed into a hollow rectangular parallelepiped with an opening at the bottom, and the bottom sheet is a rectangular watertight sheet that covers the bottom opening of the rectangular parallelepiped formed by shaping the top sheet and is welded to the edge of the opening. It is something that

Furthermore, the method for manufacturing a waterbed bag according to the present invention includes a top sheet processing step and a top and bottom sheet welding step, wherein the top sheet processing step includes cutting the four corners. Each side of a rectangular watertight sheet with a cutout is bent at right angles, the edges are further bent at right angles, the butt ends of each adjacent side are welded, and the bottom surface is formed into a hollow rectangular parallelepiped. The upper and lower sheet welding process is a process of welding a rectangular watertight sheet to the lower opening edge of the rectangular parallelepiped formed in the upper sheet processing process. The lower sheet forms a part of the bottom surface of the bag.

[Effect]

The upper sheet is shaped into a hollow rectangular parallelepiped, and the lower sheet seals the bottom opening of the bag.

When using a waterbed, the bottom surface of the bag is installed closely to the bottom of the frame, so it is hardly affected by bending, stretching, vibration, etc. of the bag, and the sheet is not damaged due to material fatigue. , peeling of the joint is unlikely to occur. Additionally, the functionality of the waterbed can be improved by using different materials for the upper and lower sheets.

〔Example〕

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

The waterbed bag according to the present invention is the same as the conventional product in that a watertight sheet such as a synthetic resin sheet or a rubberized sheet is shaped into a flat rectangular parallelepiped like a pine tress.

In the present invention, the bag body 7 is composed of a combination of two sheets, an upper sheet 1 and a lower sheet 9, as shown in FIG.
The upper sheet 1 is shaped into a hollow rectangular parallelepiped having an opening 6 at the bottom, and the lower sheet 9 seals the shaped opening 6 of the rectangular parallelepiped.

FIG. 2 is a plan view of the upper sheet used in the present invention. The upper sheet 1 is a rectangular sheet having notches 2 cut out at right angles and at an angle at the four corners, ensuring the length of the rising part of the bag at both corners of each side. The seat surface is divided into an upper surface portion 3, a four-periphery rising portion 4, and a bottom edge portion 5, and as shown in FIG. 3, the seat surface of the upper sheet 1 forms the edge of the upper surface portion 3. It is bent at a right angle along the folding line, and the bottom edge 5 attached to the rising part 4 is bent inward at a right angle, and the edges of the rising part 4 and the edges of the bottom edge 5 which are adjacent to each other are welded and joined. As shown in FIG. 4, the bag 7 is shaped into a hollow rectangular parallelepiped having an opening 6 at its bottom which is to become the main body. A cloth 8 is applied to each rising portion 4 so as to span between the front or back surface and side surfaces of the rectangular parallelepiped, and the cloth 8 is welded to the sheet surface of the bag body 7 to increase the sealing strength of the joint. The lower sheet 9 is the bag body 7
It is a rectangular sheet that seals the opening on the bottom of the The lower sheet 9 is applied to the lower opening 6 of the rectangular parallelepiped formed by shaping the upper sheet 1, and is welded and joined to the mouth edge of the lower sheet 9 to seal the bag body 7, thereby completing the bag body 7 shown in FIG. . In the figure, IO is a spout that opens on the top sheet of the bag body 7.

The bag 7 according to the present invention is used as a water bed by filling the hollow interior with water through the spout 10 and installing it in a frame 11 as shown in FIG. 5.

As is clear from FIG. 5, since the welded joint 12 between the upper sheet 1 and the lower sheet 9 is the lower surface of the bag body 7 that contacts the bottom of the frame 11, the welded joint 12 of the upper sheet 1 and the lower sheet 9 is The bag is hardly affected by material fatigue factors such as bending, elongation, and vibration, and cracking and cutting from the welded joint 12 can be avoided. Further, the joint portion 12 of both sheets is separated by the lower surface of the bag body 7 that contacts the bottom of the frame 11, and is not exposed on the outer surface.

Note that the upper sheet 1, which forms the main body of the bed, is made of a sheet with an elegant color tone, and the lower sheet 9 is a black sheet with good heat absorption efficiency, and the materials of both sheets are used in combination. Therefore, the functionality as a water bed can be improved.

[Effects of the Invention] As described above, according to the present invention, a combination of an upper sheet and a lower sheet is used for the bag body of the water bed, and the upper sheet is shaped into a rectangular parallelepiped having an opening on the lower surface. Because it is sealed with the bottom sheet, no stress is applied to the welded joint between the top and bottom sheets while the waterbed is in use, preventing the occurrence of cracks that could lead to breakage between the two sheets. Durability can be significantly improved. In addition, since the joints between the face sheets are not exposed to the outside while the waterbed is in use, the appearance is excellent, and the welding of the rising parts at the four corners can be done with the bag open, making welding work easier. This has the effect that the fabric can be easily attached.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view showing an embodiment of the bag according to the present invention, FIG. 2 is a plan view of an upper sheet used in the present invention, and FIG.
Figure 4 is an explanatory view showing the manufacturing process, Figure 5 is a sectional view showing the state of use, Figure 6 is a perspective view showing a part of a conventional water bed bag, and Figure 7 is a diagram showing the bag body. FIG. 8 is a plan view of the sheet used, FIG. 8 is a diagram showing how to attach the cloth, and FIG. 9 is a diagram showing the state of use of a conventional bag. 1...Top sheet 2...Notch 3...
・Top part 4...Rising part 5...Bottom edge part 6...Open lower part...Bag body
8...This cloth 9...Lower sheet

Claims (1)

[Claims] (1) A bag for a water bed that has an upper sheet and a lower sheet, and is made into a bag by welding both sheets, the upper sheet being a rectangular watertight sheet with notches at the four corners. Each side of the bag is bent to form the top surface, four rising edges, and a part of the bottom edge of the bag, and the butt ends of each side are welded and joined to form a hollow rectangular parallelepiped with an opening at the bottom. A water bed bag, wherein the lower sheet is a rectangular watertight sheet that covers a bottom opening of a rectangular parallelepiped formed by shaping the upper sheet and is welded to the edge of the opening. (2) A method for manufacturing a waterbed bag comprising a top sheet processing step and a top and bottom sheet welding step, wherein the top sheet processing step involves cutting each side of a rectangular watertight sheet with notches at the four corners at right angles. This is the process of bending the edges at right angles and welding the butt ends of each adjacent side to form a hollow rectangular parallelepiped with an open bottom. This is the process of welding a rectangular watertight sheet to the bottom opening edge of the rectangular parallelepiped formed in the processing process.The top sheet forms the top surface, four rising surfaces, and a part of the bottom surface of the bag body, and the bottom sheet forms the bottom surface of the bag. A method for producing a waterbed bag, characterized in that the bag forms a lower surface of the bag.