JPH05156543A - Heat-shielding material - Google Patents

Abstract

PURPOSE:To attain a heat-shielding effect by reflecting electromagnetic wave extending from visible light to near infrared ray or thereabout on the surface of a cloth. CONSTITUTION:The objective heat-shielding material contains >=30% covering yarn containing a metallized slit yarn as the sheath and has a reflectance of >=40% to electromagnetic wave having wavelength range of 700-2,400nm.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heat shield material. More specifically, the present invention provides a heat shield material having a high reflectance with respect to an electromagnetic wave having a specific wavelength by using a slit yarn which is metallized.

[0002]

2. Description of the Related Art Hitherto, various attempts have been made to reflect radiant heat such as sunlight on a cloth and use it for the purpose of preventing heat. For example, there is a means for vapor-depositing or sputtering a metal such as aluminum on a woven or knitted material, and electroless plating, but the adhesiveness between the metal such as aluminum and the fiber material of the woven or knitted material is low by any method, and abrasion, rubbing, washing, etc. It had the drawbacks of low durability such as peeling due to physical irritation and deterioration in both performance and appearance, and the texture of the metallized woven or knitted fabric was hardened.

In another example, a method in which fine powder of a metal such as aluminum is mixed with a resin or a film to coat or laminate the woven or knitted fabric is also used. On the contrary, when it is used as a material for clothes, it causes an unpleasant feeling such as stuffiness.

[0004]

DISCLOSURE OF THE INVENTION The present invention has drawbacks such as low durability when the metallization is directly applied to the cloth, hardening of the texture, and deterioration of air permeability of the cloth coated or laminated with metal powder. The purpose is to solve various problems.

[0005]

According to the present invention, as a result of diligent efforts to achieve the above object, the covering yarn having metallized slit yarn as a sheath yarn is used in an amount of 30% by weight or more of the fabric, instead of post-processing the fabric. , Wavelength range 700-2400
The heat shield material has a reflectance of at least 40% or more with respect to electromagnetic waves of [nm]. The metallized slit yarn here means aluminum, silver, gold,
Metals with metallic luster such as stainless steel, brass, chrome, tin and zinc are applied to polyester, nylon, cellulosic film or other resin film by vacuum evaporation, sputtering, electroless plating, electron beam, etc. After forming a film, it refers to a narrow width yarn cut into an arbitrary width. The fabric of the present invention is a woven or knitted fabric, a non-woven fabric or the like in which 30% or more of the fabric is covered with a covering yarn having a sheath made of the slit yarn and a core made of an arbitrary fiber material with almost no space left therebetween. If the covering thread has a usage rate of 30
If it is less than%, it is difficult to maintain the reflectance for electromagnetic waves in the wavelength range of 700 to 2400 [nm] at 40% or more, and the sufficient heat shield effect aimed at by the present invention cannot be exhibited.

The wavelength range 700 to 2400 [nm] corresponds to a long wavelength portion of visible light acting as a heat ray, a near infrared ray, and a short wavelength portion of middle and outer rays. The wavelength band of less than 700 [nm] is in the visible light and ultraviolet regions, and has relatively little effect as a heat ray. Further, electromagnetic waves in the wavelength band of more than 2400 [nm] and up to 25000 [nm] act as heat rays, but in general, the energy intensity of electromagnetic waves contained in the heat radiation of a high-temperature object is not so high and it does not pose a problem. The reflectance here is measured by a Shimadzu spectrophotometer UV-3100S manufactured by Shimadzu Corporation. If the reflectance of the fabric is less than 40%, the total absorption and transmission of heat energy by the fabric is 60% or more,
When used as a clothing material, it shows that most of the heat rays from sunlight and high temperature objects are absorbed or transmitted as heat to the human body.

[0007] Therefore, by using a covering yarn having a sheath of metallized slit yarn in an amount of 30% or more of the cloth, a heat shield material having a reflectance of at least 40% or more with respect to electromagnetic waves in the wavelength range of 700 to 2400 [nm]. Can be obtained.

[0008]

The heat shield material of the present invention has a reflectance of 40% or more in the main electromagnetic wave band which acts as a heat ray in the radiant heat emitted from sunlight or a high temperature object. The effect of suppressing the inflow of heat due to permeation is exhibited.

The present invention will be described in more detail with reference to the following examples.

[0010]

Example 1 and Comparative Example 1 A polyester film having a thickness of 12 μm was vapor-deposited with silver on one side of 400 angstrom, two vapor-deposited sides were stuck together, and then cut into a slit yarn with a width of 0.253 mm to form a slit yarn. 100 denier,
250 to 24 filament polyester filament
A yarn covered with 0 T / m was prepared.

A plain knitted fabric was knitted using 100% of the covering yarn (Example 1). 25% by weight of the covering thread, 1
A knitted fabric in which polyester filaments of 00 denier and 24 filaments were knitted to be 75% by weight was knitted (Comparative Example 1). The reflectance for electromagnetic waves was measured by Shimadzu's own recording spectrophotometer UV-3100S manufactured by Shimadzu Corporation. The measurement results are shown in FIG. Example 1 using 100% covering yarn
Is a curve of 3 and has a reflectance of at least 50% or more in the entire wavelength band of 700 to 2400 [nm]. On the other hand, Comparative Example 2 in which only 25% of the covering yarn was used was the curve of 4, and the reflectance in the same wave number band was almost 40% or less.

[Brief description of drawings]

FIG. 1 is an enlarged view (side view) of a covering yarn of Example 1.

FIG. 2 is a graph showing the relationship between the wavelength and the reflectance of the knitted fabrics of Example 1 and Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyester filament 2 Silver vapor deposition slit yarn 3 Spectral reflectance in the knitted fabric of Example 1 4 Spectral reflectance in the knitted fabric of Comparative Example 1

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F16L 59/08 9138-3J

Claims (1)

[Claims] 1. A covering yarn having a metallized slit yarn as a sheath yarn is contained in an amount of 30% by weight or more of the cloth, and has a reflectance of at least 40% or more with respect to an electromagnetic wave in a wavelength range of 700 to 2400 [nm]. Heat shield material.