JPS5831797Y2 - Tsuuki safety lid - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a novel breathable inner lid particularly suitable for use as an inner lid of a container for storing a gas-generating liquid such as a hydrogen peroxide solution.

Conventional storage containers for gas-generating liquids such as hydrogen peroxide solution are
Normally, the opening of the container body is covered with an inner lid, and an outer lid with an open top is screwed onto the inner lid to tighten the inner lid, but the inner lid is made of a soft material such as silicone. A circular sheet with a cut in the center is used.

In this case, when gas is generated, the internal pressure allows the gas to escape through the slits, but there is a drawback that liquid may leak from the slits if the storage container is tilted.

Therefore, there is also known a sandwich-like structure in which a liquid-impermeable but gas-permeable membrane similar to the one used in the present invention is sandwiched between two polypropylene sheets with a cut in the center. However, since three membranes are used in this case, there are disadvantages in that they are difficult to handle, such as requiring time to fit them together and causing them to shift from each other.

The present invention provides an inner lid with a new structure that eliminates the drawbacks of the conventional ones, and includes a plastic film that is substantially liquid-impermeable and gas-permeable, and a gas-permeable plastic film on one or both sides. This is a breathable inner lid made by thermally bonding a porous reinforcing membrane made of fabric or non-woven fabric.

This will be explained with reference to an embodiment shown in the drawings. In FIG. 1, 1 is a membrane made of a liquid-impermeable but gas-permeable microporous polymer film of, for example, an open cell type;
2 is a sheet of porous material adhered to both sides thereof.

Various liquid-impermeable, gas-permeable plastic membranes can be used, including polyolefins such as polyethylene and polypropylene, polycarbonates, polyamides, and polyacecooles made porous by solvent methods, stretching methods, electron beams, etc. Examples include polynytails such as Polynylene Tail, and microporous films of hydrophobic plastics such as fluororesin.

In particular, a microporous film of polypropylene with a pore diameter of about 0.1 μm is suitable.

Such a film can be produced, for example, by the method described in Japanese Patent Publication No. 46-40119.
No. 400 commercially available from Polyplastics ■ may be used.

In contrast, membranes made of hydrophilic plastics such as cellulose cannot be used because they allow liquids such as water or hydrogen peroxide to pass through.

As the porous plastic material to be bonded to such a plastic membrane, a material having good air permeability and appropriate strength is used, but a material having chemical resistance and the above-mentioned membrane is used. It is desirable that the inner cover has adhesive properties and also has appropriate smoothness and elasticity so that it can be sealed when the inner cover is tightened with the outer cover.

As such porous material, cloth or nonwoven fabric can be used, and polypropylene nonwoven fabric is particularly preferred.

Polypropylene microporous film easily adheres to polypropylene nonwoven fabric by heat, has good chemical resistance, is impermeable to liquids, and has good air permeability, so an inner lid suitable for the purpose of the present invention can be easily obtained.

The breathable inner lid of the present invention can be suitably used as an inner lid for a storage container for hydrogen peroxide, etc., as well as conventional ones.

In FIG. 2, 3 is a gas-generating liquid, 4 is a container body, 5 is an inner lid, and 6 is an outer lid.

[Brief explanation of the drawing]

FIG. 1 is a suggested perspective view of the inner lid of the present invention, and FIG. 2 is a sectional view showing an example of the state of use. 1...Reduced permeability, gas permeable membrane, 2...
Porous material, 3... Gas-generating liquid, 4...
...Container body, 5...Inner lid, 6...
Outer lid.

Claims (1)

[Scope of utility model registration request] A porous reinforcing membrane 2 made of a nonwoven fabric made of polypropylene is thermally bonded to one or both sides of a membrane 1 made of a microporous film of photopropylene that is substantially liquid-impermeable and gas-permeable. Inner lid.