JPH0247348A - Moisture permeability-controlling sheet - 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 [Industrial Field of Application] The present invention provides household electric cooling i1. The field installed in the warehouse ("
~ This relates to Namuro's 71 If control.

[Problems to be solved by conventional techniques and inventions] Conventionally,
The vegetable compartments of household electric refrigerators were kept tightly closed and kept cold to keep vegetables fresh for a long time. However, this method of airtight and cold storage makes the room unnecessarily humid due to the moisture emitted from the fresh vegetables, resulting in excess water droplets forming on the walls of the container.

On the other hand, it has the disadvantage that vegetables are easily damaged.

In recent years, vegetable compartments have been kept at a moderate humidity of about 90%, and only excess water is allowed to escape through a moisture-permeable filter, which prevents excessive water from evaporating and preventing the formation of water droplets. A method has been proposed to prolong the freshness of food without spoiling it.

Normally, this moisture permeable filter material has a fine pore structure and is moisture permeable, and has a thickness of 10 to 80 mm. Chron's silicone thin film is used, but although it can control moisture permeability, it has the drawbacks of weak strength and poor handling due to its ultra-thin film structure, so it is necessary to use a reinforcing base material. It is.

The reinforcing base material is mainly a woven fabric or non-woven fabric base material with a high porosity that does not inhibit moisture permeability, but since it is used in a high temperature environment, there are problems such as mold formation and propagation. Gaaimaru.

[Means to solve problems]

The present invention is directed to the transparent one used in such conventional refrigerator vegetable compartments.
It was created in view of the shortcomings of the 1fiFJ' control filter material, and is a fertile nonwoven fabric #d# that is highly strong, has excellent moldability and handling properties, and has excellent moisture permeability control without the growth and propagation of mold. It is the stuttering that provides.

That is, the fiber density is L OjF, / 5 to 20% (+3.P, U
)'s foamable resin or resin binder fills the interfiber voids and solidifies the material to a moisture permeability of too~3000 f/♂・g4
The problem was solved by adjusting hK.

In order to develop uniform and stable moisture permeability, it is necessary to use a KFi microporous base material, and it is necessary to use a fine denier material with a fiber diameter of 15 microns or less. At least fiber selected from polyolefin type, polyacrylic type, p, V, A type, polyvinyl/vinylidene waste, rayon, acetate, etc., each alone or in a mixture of multiple types! Contains io% or more,
JJ! uses a Norpa Goo high-density nonwoven fabric sheet made of these fibers and heat-adhesive fibers! This allows stable control of moisture permeability.

Fiber diameter: 15 microns or more, fiber density: L Ofl/c
If it is less than rms, voids generated by fiber entanglement points become large, making it difficult to control stable moisture permeability, which is not preferable. Furthermore, if the blending ratio of heat-fusible binder fibers is 50 percent or more, the area covered by the film becomes too large, making it difficult to obtain a homogeneous moisture-permeable filter, which is not preferable.

The moisture permeability of the binder-free high-density nonwoven fabric using fine denier fibers obtained in this way is 5000 to 10000I1.
1/-・24h, and the indoor temperature is 90% optimal +1
Difficult to hold in j%! fP Namuro's transparent r'! It is unsuitable as a filter material, and requires control of transparency.

That is, 5 to BO% (D, P, U) of a resin adhesive or a resin binder that does not contain a foaming agent to form a foamable composition is applied to the core base material by impregnation or coating, and the fine voids are formed. The moisture permeability is 1000 to 8000 f/l, which is useful as a moisture permeable filter material for vegetable compartments.
It is the ton that is controlled at 1.84h.

Although it is possible to control the desired moisture permeability by applying ordinary non-foaming resin and controlling 1, it is inferior to the uniformity, stability, reproducibility, etc. Preferred is the method by formation of .

In addition, by using antibacterial materials (anti-bacterial fibers, antibacterial agents, etc.) in the fiber materials and binders used, mold and mildew will not grow even when used in high temperature environments. It can be used cleanly.

A more detailed explanation will be given below based on examples.

Example 1 A mixture of fine denier polyester fibers with a fiber diameter of 8 microns (0.8 d The laminated fiber web was calendered using a pair of calender rolls heated to goo℃ under linear pressure SO to produce a fabric with a basis weight of 120 f/, p, thickness of 0.11 m, and fiber density of 11 fl/css. A nonwoven fabric sheet was obtained.

The nonwoven fabric sheet thus obtained was impregnated with a binder of the following composition to give a dry weight of 12 y/i (Dp(J-1
0%) to obtain a moisture permeability control sheet.

Binder combination Kurtokuzo kBfJB1K 600 parts (acrylic binder T-5-45%)! Ikrosphere F
B0 40 parts (foaming agent T-8-7
0%) Courtside D (benzimidazole-based mold-proofing) g part'
rs time 80% Example & Polyester fiber with fiber diameter 18 microns with anti-drunk performance (L5dX5 If% antibacterial fiber manufactured by Kanebo @ Pakutekira) 70ql, unstretched polyester fiber gdX8
By calendering a uniformly spread and r-fiber web made of 8F180% by the same method as in Example 1, the date 150 p/ms, thickness (115B,
Fiber density L Oy7. , s was obtained. This nonwoven fabric sheet is coated with a urethane resin emulsion that does not contain a foaming agent to give a dry weight of 10%.
g//IP was applied to obtain moisture permeability control sheet 2.

Comparative Example Polyester fiber with a fiber diameter of 18 microns, (8dX51
70%, unstretched polyester fiber 5dx88B8
0% jb uniformly opened and laminated memory fiber web % 1
2@ by a pair of calender rolls heated to 50℃
Calendering is performed at pressure 30-/equipment 2, and the basis weight is I.
SO! ! /ff? , thickness ag.

1. A nonwoven fabric base material with a fiber density of 0.75 f/2B was obtained.

This non-woven fabric base material is impregnated with an acrylic binder Kf13
．． 111&41ttte15 jF/m” (1) pU-1
0%) was obtained.

Table 1 shows the physical property values of the moisture permeability control sheets of Examples 1 and 2 and Comparative Example obtained as described above.

・Snoring 1, compliant with lTS L-10994-1 method (k-enka calcium method)
4. Scratch resistance and snoring after 200 cycles of washing abrasion test using a nylon bundler A non-woven fabric cut into a circle with a diameter of 81 was pasted on a flat plate on which a spindle medium was fixed, and a mixture of 8 types A suspension consisting of spores was sprayed uniformly onto the culture medium and the surface of the nonwoven fabric sample, and cultured at 28°C for 14 days. Mold on the surface of the sample after!
He preached about the degree of breeding.

m: Mold V on the sample surface! Number of potatoes with no growth observed:
Samples in which active mold growth is observed on the entire surface of the sample [Effects of the Invention] As shown above, the moisture permeability control sheet of the present invention eliminates the dark voids between the fibers by bonding the fibers by fusion using fine denier rutted fibers. Excellent reproducibility is achieved by applying a resin binder that forms a foam film or a resin binder that does not contain a foaming agent to the packed high-density transformed woven fabric sheet, and by applying a more uniform packing and adjusting air permeability. It is possible to stably create a moisture-permeable filter medium, and it has excellent handling properties such as high strength, friction resistance, and moldability.
In addition, the present invention provides a moisture permeability control sheet which has an anti-mold effect by using an anti-scald material and is extremely useful as a moisture permeability filter material for humidity control in a refrigerator vegetable compartment.

Ya #, to R2-・,'ゝ1 X゛　ノ゛

Claims (2)

[Claims] (1) A web consisting of at least 50% by weight of fine denier chemical fibers with a fiber diameter of 15 microns or less and heat-fusible fibers, the fibers of which are thermally bonded to each other and have a fiber density of 1.0 g/cm. A binder-free non-woven fabric sheet containing no binder of ^3 or more is filled with 5 to 20% (D.P.U.) of foamable resin or resin binder to fill the interfiber voids and fixed, resulting in a moisture permeability of 1000 to 3000 g/m. A moisture permeability control sheet that can be adjusted to 2.24 hours. (2) A moisture permeability control sheet comprising the moisture permeability control sheet according to claim 1 or containing antibacterial fibers or an antibacterial agent.