JPH01267162A - Air-tight bags having check-type valve - Google Patents

Abstract

PURPOSE:To obtain air-tight bags having stable functions and structure suitable for efficient mass production of multi-layered bags, by processing original films for an inner layer to primarily form a flat cylindrical valve and overlapping and attaching outer layers on both sides of the inner layer to form the air-tight bag. CONSTITUTION:An inner layer 4 is composed of two opposing heat fusible plastic films 3, 3' which are heat-sealed with each other along parallel heat- fusing lines 6, 6'. Parallel to and on the outsides of the heat-fusing lines 6, 6' are provided slits 7, 7' which extend along a partial length of the inner layer 4. The slits provide for forming a flat cylindrical valve 10 having a valve cavity 9 and cause the valve to be free from an influence of the surrounding part of the inner layer 4. Over both side faces of the inner layer 4, outer layers 2, 2' are arranged in such a manner that the inner and outer layers are attached to each other by heat-fusion along an upper peripheral line 14, a lower peripheral line 15 and side peripheral lines 16, 16' except for the lower edge of the inner layer 14. As a result, an air-tight bag having an integrated structure of inner and outer layers is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airtight bag provided with a check valve body used for binding bodies, cargo movement prevention materials, floating bodies, heat insulating materials, etc.

Conventionally, the airtight bag for this dish was manufactured by attaching a separately manufactured non-return valve body to a part of the airtight bag, which enabled efficient mass production and multiple airtight bags in which many airtight bags were connected. There were various difficulties in producing it. In order to solve this problem, attempts have been made to manufacture bags by aligning the layer that exhibits the valve effect with the layer that will serve as the outer wall, but this results in instability in the check function.

The object of the present invention is to obtain an airtight bag that is suitable for efficient mass production or multi-bag production, and that has a stable function.

The airtight bag according to the present invention is manufactured by fusion-bonding each joining line mainly by heat sealing, but in some cases, a folding line may be used instead of the joining line. To explain the configuration with reference to drawings of embodiments, Fig. 1 is a perspective view showing an actual example B of the airtight bag with the inside cut open, and Fig. 2 is a diagram showing Fig. 1 A-A.
Although it is a cross-sectional view along the line, the middle layer (Ku) is made of heat-sealing plastic films (3×3) stacked on top of each other, and a part of the opposing surface has a non-adhesive treatment part (5) that will result in poor quality. There is a Japanese movie fusion 6 along the almost parallel line that sandwiches the rag processing part!
The membrane (3X3') is joined by (6X6), and the membrane is cut along the outside of this Japanese film fusion line by the valve opening cutting line (7) (7'), and the membrane has the valve cavity (9) and the lateral side. A flat cylindrical valve body (10) is formed which is separated from the restraints of other parts. Table II (2) (2') of a heat-fusible plastic film or a sheet-like material mainly made of heat-fusible plastic is placed on both sides of such an intermediate layer, and
The upper side joining line (14), the lower side joining line (15), and the side joining line (16) intersect with the middle layer's defense fusion line and cut off the defective treatment area.
χ16) etc., an airtight bag (1) is constructed in which the peripheries of the surface layer and the middle layer are integrated except for the bottom line (13) of 4, and the surface layer is the outer wall. At the upper end of the flat cylindrical valve body formed in the middle layer, the outer surface is exposed, that is, it is joined to the inner surface of the outer wall by the upper edge joining line, but the inner surface is not joined due to non-adherence processing, so that the valve cavity is not connected. is the external opening end m
) opens to the outside of the airtight bag, and the internal opening end (12) that opens to the bottom line of the middle layer opens into the airtight chamber (K), so air, etc. injected from the external opening end passes through the valve cavity. can flow into the airtight room. - If air or the like tries to flow out of the airtight bag, the flat cylindrical valve body tightly closes the valve cavity due to internal pressure, preventing the air from flowing out.

What is important about the airtight bag with the above structure is that the heat-fusible plastic films are bonded to each other in the middle layer by a welding line to form the valve cavity, and the outside of the valve cavity is formed by cutting the valve opening line along the welding line. This is a crucial point. Even without this separation, the valve cavity still exhibits a certain degree of non-return action, but since the middle layer itself is connected to the surface layer, that is, the outer wall of the airtight bag, it is statically immune to the effects of various deformations and strains on the outer wall. This causes the valve cavity to become flattened, that is, the close contact between the inner surfaces of the valve cavity is disrupted, the inversion becomes unstable, and sometimes leaks occur and the bag cannot function as a perfect airtight bag. It is. Therefore, a stable non-return function is achieved by cutting off the sides of the valve body from the restraint of the outer wall by illuminating the valve opening cutting line, and creating a structure that is not easily affected by the outer wall. . It is sufficient to make this cut along the valve opening cut line to cover the area where the anti-pressure property of the valve cavity occurs, and the presence or absence of some uncut portion at the end is hardly a factor that inhibits the check function. Rather, it leaves room for operations to further enhance the valve function by taking advantage of the fact that it is connected to the lower line. Also, during production, the uncut portion stabilizes the middle layer, which is convenient. Figure 3 is another fruit 1 of the airtight bag.
This is a perspective view showing an example M. The difference between this embodiment and the embodiment shown in FIG. Disconnection (
8x8') to form a flat cylindrical valve body (10). The Japanese movie fusion line is a thermal fusion a that is superimposed on opposite sides.
The flexible plastic films (3) and (3') are melted together and bonded together at the cut surface, and as a result, the valve is formed in exactly the same way as in the embodiment shown in FIG. A flat cylindrical valve body (10) having a cavity (9) and whose sides are separated from the restraints of other parts is formed. The procedure for constructing the airtight bag (1) from the middle layer (kyu) and surface layer (2χ2') and the function of the constructed airtight bag are exactly the same, but the top joining line (14) is always Please note that it is applied so that it intersects with the fusion line. Fig. ψ is a perspective view showing still another embodiment of the airtight bag. In this embodiment, the valve opening cutting line (7
A part of the middle layer is cut off by the horizontal cut IIX (17 x 16) connected to it to form a missing part (19 x 14), which will reduce the influence of the outer wall on the flat cylindrical valve body (10) as much as possible. This is particularly effective for small airtight bags.

Fig. S is a perspective view showing yet another embodiment of the airtight bag. In this embodiment, the Japanese film melting line (8x8') in the embodiment of Fig.
18
This embodiment is completely the same as the embodiment shown in FIG. , FIG. 3 is a front view showing an embodiment of the multiple airtight bag. In this embodiment, a large number of unit airtight bags (1) having the same configuration as the embodiment in FIG. It has a structure in which 16x12 is connected and connected, and the middle layer extending outward from the upper side joining line (14) is joined at the upper side outer joining line (21) to form a ventilation path (22). It is possible to inject air, etc. into each airtight bag at once through the channel.In the formation of the middle layer, the missing parts of adjacent unit airtight bags are connected to each other to form a window-like missing part (19 x 19). It is.

In each example, the non-adhesive treatment section (5) is used to inject a non-adhesive film into this part, print a non-adhesive film, or use other methods available in various countries, resulting in the inner surfaces of the valve cavity being separated from each other in this part. This is to prevent non-delivery.

In the airtight bag according to the present invention, first, in the first step, the raw material for the middle layer is fed out and processed mainly to form a flat valve body, and then in the second step, the raw material for the surface layer is fed out and stacked on the middle layer. It is possible to continuously form airtight bags by simultaneously performing the processing to form airtight bags, or by layering the formed airtight bags to obtain an IrL-only airtight bag. Or many ki! ! ! The configuration is suitable for efficient mass production of multiple airtight bags in which the bags are connected, and the extremely stable non-return concentration ability of the flat cylindrical valve body formed in the middle layer allows it to withstand severe usage conditions. This provides an airtight bag that can withstand even the most severe weather.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the airtight bag, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a perspective view showing another embodiment of the airtight bag, and No. 1 Iχ is an airtight bag. Fig. S is a perspective view showing still another embodiment of the airtight bag, and Fig. 3 is a front view showing an embodiment of the multiple airtight bag. 1 Airtight bag 2.2' Surface layer 3.3' Thermofusible plastic film 4
Middle layer 5 Non-adherence treatment section 6.6 Valve opening fusion line 7.7' Valve opening cutting line 8.8' Valve opening fusion breaking line 9 Valve cavity 10 Flat cylindrical valve body 11 External opening end 12 Internal opening end 13 Lower line 14 Upper side joining line 15 Lower side joining line 16.16' Side joining line 17.17' Lateral cutting line is, ts' Lateral fusion cutting line 19.19' Missing part 20 Seal chamber 21 Upper side joining line 22 Ventilation path application Kiyoshi Takaura Figure 1 - Figure 3! Figure ≠ Figure S

Claims (1)

[Scope of Claims] 1. The surface layer (2) (2') is a heat-fusible plastic film or a sheet-like material mainly made of heat-fusible plastic, and the middle layer (¥4¥) is stacked facing each other. A non-adhesive treatment area (5) that results in non-adhesion is formed on a part of the opposing surface, which is made of heat-fusible plastic films (3) (3'), and a valve-side fusion line (6) sandwiching the non-adhesion treatment area. The valve cavity
A flat cylindrical valve body (10) is formed with a surface layer on both sides of the middle layer, and an upper side joining line (14) that intersects with the valve side fusion line or the valve side fusion line and crosses the non-adhesion treatment part. ) and are joined by the lower side joining line (15), side joining lines (16), (16'), etc., and the surface layer (2) (2') is used as the outer wall and the middle layer (\
Valve cavity (9) of flat cylindrical valve body (10) formed in 4 yen)
An airtight bag characterized by forming an airtight chamber (20) connected to the outside through the airtight bag. 2. In the middle layer (¥4¥), cut the valve side cutting line (7) (7'
) and the transverse cutting lines (17) (17') connected thereto, or by the valve side melting lines (8) (8') and the transverse cutting lines (18) (18') connecting thereto. The airtight bag according to claim 1, characterized in that cutouts (19) (19') are formed on both sides of the valve body (10).