JPS6140519Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvement of a sheet-like ventilation material.

Venting materials are used for various purposes, and one of the main uses is for attaching them to mushroom cultivation containers.

Conventionally, in such cases, a through hole was provided in the lid of the cultivation container, and cotton was stuffed into the through hole. However, since cotton has an insufficient ability to prevent the invasion of various bacteria, the growth of mushrooms is easily inhibited, leading to large variations in cultivation yield.

To solve this problem, it has been proposed to heat-seal a porous polypropylene sheet over the through-holes provided in the lid. According to this method, the ability to prevent germs from entering is greatly improved compared to the cotton stuffing method, but
Attachment of the porous sheet to the lid requires a heat fusing device, which cannot be easily done at mushroom cultivation sites, so it has not been put into practical use.

The present invention relates to a ventilation material that solves the problems of the prior art described above, in which one side of a microporous sheet made of water-repellent plastic has greater air permeability than the microporous sheet and has thermal adhesive properties. The reinforcing sheets are overlapped, and both sheets are heat-sealed around the entire edge of the reinforcing sheet, and a pressure-sensitive adhesive layer is further provided around the entire edge of the reinforcing sheet on the opposite side of the superimposed surface with the microporous sheet. It consists of

The microporous sheets used in this invention include polyethylene, polypropylene, polyvinyl chloride,
It is made of water-repellent plastic such as fluororesin, and has countless micropores with a pore diameter of 0.01 to 100 microns formed through stretching, foaming, etc., and is breathable and prevents impurities such as bacteria, rainwater, and dirt from entering. It has multiple functions. As this microporous sheet, one having a porosity of 15 to 90% and a thickness of 20 to 500 microns is practically suitable.

Further, the reinforcing sheet has higher air permeability than the above-mentioned microporous sheet and has heat-sealability. Specific examples thereof include (a) a nonwoven fabric or mesh sheet made of polyamide, polyester, polyolefin, etc.; ) A heat-adhesive plastic sheet with countless micropores formed by stretching, foaming, etc. (pore size or porosity set larger than that of a microporous sheet), (c) Ventilation holes formed in the plastic sheet by punching, etc. The sheets, etc. that formed the structure are punched.

Hereinafter, examples of the present invention will be explained with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 designates a microporous sheet, on one side of which a reinforcing sheet 2 is superimposed, and both sheets 1 and 2 are heat-sealed along the entire circumference of their edge portions. 3 is a pressure-sensitive adhesive layer provided around the entire edge of the reinforcing sheet 2 opposite to the superimposed surface with the microporous sheet 1, and 4 is a pressure-sensitive adhesive layer provided to protect the adhesive layer 3 until use. This is a temporary separator.

To attach this aeration material to the lid of the mushroom cultivation container, as shown in FIG. Since it only needs to be glued and no special equipment is required, it can be easily done at mushroom cultivation sites. Furthermore, when the performance of the ventilation material deteriorates, it can be easily replaced.

FIG. 4 shows another example of the present invention, in which a surface protection sheet 7 is bonded onto the microporous sheet 1. This surface protection sheet 7 can be used as long as it does not impede the air permeability of the microporous sheet 1, and the same type as the reinforcing sheet 2 is usually used. Note that the microporous sheet 1 and the surface protection sheet 7 are joined by partial adhesion or partial fusion.

FIG. 5 shows still another example of the present invention, in which pressure-sensitive adhesive layers 3 and 8 are provided on both surfaces of the reinforcing sheet 2, and a large number of ventilation holes with relatively large pores are provided approximately in the center to provide ventilation. 9 is used. If such a reinforcing sheet 2 is used,
Not only does it have the advantage of preventing mutual misalignment during heat fusion with the microporous sheet 1, but also allows both sheets 1 to be bonded together.
and 2 are joined by both heat fusion and adhesion, which also has the advantage of improving the joining strength of both sheets.

The ventilation material of the present invention is constructed as described above, and has the effect of not only being able to be attached to a predetermined location by simply pressing when in use, but also being easily replaced in the event of performance deterioration.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of the ventilation material according to the present invention, Fig. 2 is a sectional view taken along line A-B in Fig. 1 and viewed from the direction of the arrow, and Figs. FIG. 3 is a sectional view showing another example of use of the present invention. 1...Microporous sheet, 2...Reinforcement sheet, 3...
...Pressure sensitive adhesive layer.

Claims (1)

[Scope of utility model registration request] On one side of a microporous sheet made of water-repellent plastic, a reinforcing sheet that has greater air permeability than the microporous sheet and has thermal adhesive properties is superimposed, and both of these sheets are heated around the entire edge. A ventilating material comprising a reinforcing sheet that is fused and further provided with a pressure-sensitive adhesive layer around the entire edge of the opposite surface of the reinforcing sheet on which it overlaps with the microporous sheet.