JPS5899368A - Air-permeable liquid shielding wrapping material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-permeable liquid-shielding material that can provide air-permeable shielding with simple operations.

Generally, when culturing bacteria, etc., it is necessary to supply air while preventing the infiltration of bacteria, and for this reason, the culture container is covered with a cotton plug or the like to provide ventilation.

However, although such cotton plugs and the like can provide breathability, they cannot completely prevent the infiltration of germs.

In addition, conventional food wrap films have liquid-blocking properties but lack breathability, so they have drawbacks such as the fact that steam from the food inside cannot escape and the flavor of the food is spoiled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a breathable saliva wrap material that eliminates the above-mentioned conventional drawbacks and can be applied with a simple operation.

Therefore, according to the present invention, an air-permeable liquid-shielding wrap material is formed, which is made of open-pore tetrafluoroethylene resin and is formed into a stretched thin film so that it can adhere to the surface of an article. In this case, it is advantageous if the stretched thin film for wrapping is formed by stretching in one direction, since even if the film is fixed by firing, it can be expanded in a direction perpendicular to the stretching direction. In particular, when the stretching ratio in one direction is set to 50 times or more, the expansion width of the thin film can be increased, and the tensile strength in the stretching direction is high, so that it can sufficiently withstand even when considerable hydraulic pressure is applied.

Next, the present invention will be explained in more detail with reference to Examples.

First, in order to obtain a continuous porous tetrafluoroethylene resin thin film, a ribbon-shaped body is obtained by mixing the tetrafluoroethylene resin powder and a liquid lubricating agent such as naphtha or white oil and by ram extrusion. Next, this ribbon-like body is spread to a desired thickness by applying it to a calender roll, and simultaneously with this spreading or after spreading, it is stretched to a desired magnification to obtain a stretched thin film. This stretched thin film is then passed through a heating device at a relatively low temperature to remove the lubricant from within the thin film, or passed through a heating device at a temperature near the melting point of the tetrafluoroethylene resin. By simultaneously performing firing fixation and removal of lubricating aid,
It is a stretched thin film that has adhesion properties to the surface of objects. The stretching at this time can be done in one direction, or in two or more mutually intersecting directions.

The stretched thin film of tetrafluoroethylene resin thus obtained has micropores of 0.2 microns or less per square inch.
Forms a membrane with more than 0 billion continuous pores. The micropores of this membrane are approximately 700 times smaller than the water vapor molecules, which are approximately 20,000 times smaller than a water droplet.
Because it is twice as large, it completely prevents liquid from passing through.
Allows passage of water vapor and other gases.

Moreover, the stretched thin film, when produced by conventional methods, has a
A tensile strength of 00 kg/cm" to 400 kg/cm2 was obtained, and according to the method described in Japanese Patent Publication No. 18,991/1980, a tensile strength of 514 kg/cm"
The above tensile strength can be obtained, as well as a porosity of 90% or more, and the transparency of the thin film and the adhesion of dust to articles can be improved.

In particular, in the present invention, a stretched tetrafluoroethylene resin thin film stretched 50 times or more in one direction can be advantageously used.

For example, as shown in FIG. 1, the breathable liquid-shielding member 1 according to the present invention is applied to the opening 30 of the test tube 2, and as shown in FIG. can be set. The breathable liquid-shielding member 1 according to the present invention has good adhesion to the surface of the article, and even if the test tube 2 is turned upside down in the state shown in FIG. 2, the liquid inside the test tube 2 will not leak out. Nothing happens. In addition, breathable liquid-shielding wrap material 1
Simply press the joint between test tube 2 and test tube 2.
Even if you shake it, the liquid will not come out.

FIG. 3 shows an air-permeable liquid-shielding container according to the present invention.
The figure shows a state in which a cap 6 with a ventilation opening 5 is screwed in and fixed to the opening of the cap. In this case, since the breathable liquid-shielding wrap material 1 is made of tetrafluoroethylene resin with a low coefficient of friction, it also has sliding properties with other objects, and the cap 6 can be easily screwed on. A complete liquid seal is achieved.

FIG. 4 shows another application example of the breathable liquid-shielding wrap material 1 according to the present invention. In this case, the vent 8 of the container 7 is covered with the breathable liquid-shielding wrap material 1 according to the present invention,
It is held down by a ventilation cap 9. By doing so, when the liquid 10 in the container 7 is transferred via the conduit 12 supported by the rubber stopper 11, the space above the liquid 10 in the container 7 is closed via the breathable liquid-shielding wrap material 1. Since the container 7 is connected to the atmosphere, it is possible to prevent bacteria from entering the container 7, and also to prevent the container 7 from entering the container 7 when transferring the liquid 10.
The internal space will not have negative pressure or high pressure and will not cause any problems.

In addition to the embodiments shown in the figures above, the breathable liquid-shielding wrap material according to the present invention can also be applied to food products, other industrial uses, and research fields such as genetic engineering and microbial engineering.

For example, if a continuous porous tetrafluoroethylene resin thin film stretched in one direction at a magnification of 50 times or more is used as the breathable liquid-shielding wrap material, it can be easily expanded in a direction perpendicular to the stretching direction to wrap the member. The wrapping material is extremely advantageous because it not only has high strength but also has excellent chemical resistance, heat resistance, electrical insulation, self-lubricating properties, non-stick properties, water repellency, etc.

In summary, according to the present invention, it is possible to obtain a member that has excellent chemical and biophysical properties and can be wrapped and liquid-blocked with a simple work procedure, so it is extremely useful in the field. .

Note that the breathable liquid-shielding wrap material according to the present invention can be made into any shape such as a sheet shape or a tape shape.

This invention is not limited to the embodiments, and it goes without saying that various changes can be made within the scope of the idea of the invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a test tube before being wrapped with an air-permeable liquid-shielding member according to the present invention, and FIG. 2 is a perspective view showing a test tube wrapped with a wrapping material according to the present invention.
FIGS. 3 and 4 are cross-sectional views of containers showing different application examples of the wrap material according to the present invention. 1: Breathable liquid-shielding vessel, member, 2: Test tube, 4.7: Container, 6.9: Cap, 10: Liquid, 12: Conduit. Patent applicant Junko Co., Ltd. FIG, l FIG, 2FI
G, 3 FIG, 4

Claims (1)

[Scope of Claims] 1) An air-permeable liquid-shielding wrap material made of open-pore tetrafluoroethylene resin and having a stretched thin film so as to have adhesion to the surface of an object. 2. The breathable liquid-shielding wrap material according to claim 1, wherein the stretched thin film is stretched in one direction. 3) The breathable liquid-shielding wrap material according to claim 2, characterized in that the stretching ratio is 50 times or more. 4) The breathable liquid-shielding wrap material according to claim 1, wherein the stretched thin film is stretched in intersecting biaxial directions. 5) The breathable liquid-shielding wrap material according to claims 1 to 4, wherein the stretched thin film is fixed by firing.