JPH1136669A - Light-transmissive thermal insulation tent sheet - Google Patents

Abstract

(57) [Problem] To provide a light-transmitting heat-shielding tent sheet that has heat-shielding properties and light-transmitting properties, is lightweight, durable, and has flame resistance. SOLUTION: An aluminum vapor-deposited layer 3 having a thickness of 100 to 300 angstroms is provided on one side of a polyester sheet or a sheet 2 made of an ethylene / α-olefin copolymer produced by using a metallocene catalyst, and is further made of polyethylene. By covering the protective layer 4, the light-transmitting heat shielding tent sheet 1 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-transmitting heat shielding tent sheet that transmits visible light and reflects infrared light.

[0002]

2. Description of the Related Art Conventional tent sheets are made of canvas and the like, so they are heavy and difficult to transport and set up.
Moreover, it was bulky and required space for storage, which was inconvenient. On the other hand, in a leisure tent or a temporary tent used in an emergency disaster or the like, a nylon or polyester woven fabric coated and waterproofed to reduce its weight is used. However, those made thin for the purpose of weight reduction do not have the effect of shielding energy by sunlight, and have a problem that the temperature inside the tent rises and cannot be used for a long time. On the other hand, a method of providing a metal layer such as aluminum on a woven fabric or a synthetic resin film and using it as a heat shielding sheet is widely known. However, since providing a metal layer of sufficient thickness to block solar energy also blocks visible light, increasing the heat-shielding property and increasing the daylighting rate are in conflicting relations. When a sheet provided with a metal layer is used for a tent or the like, the inside of the tent is dark and unsatisfactory. Furthermore, the provided metal layer causes oxidation deterioration in the air, and when repeatedly used after being bent as a tent sheet, the metal layer is cracked at the bent portion or peeled off by contact with foreign matter. It has disadvantages such as.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a light-transmitting heat-shielding tent sheet which has heat-shielding properties and light-transmitting properties, is lightweight, has strong piercing strength, and is durable. The purpose is to do.

[0004]

According to the present invention, there is provided an aluminum vapor-deposited layer having a thickness of 100 to 300 angstroms on one side of a polyester sheet or a sheet made of an ethylene / α-olefin copolymer produced by using a metallocene catalyst. A light-transmitting heat-shielding tent sheet characterized in that a protective layer made of polyethylene is provided thereon.

[0005] In the sheet having these structures, since the aluminum layer forms a layer having a uniform thickness of 100 angstroms or more, infrared rays are efficiently reflected, and
Visible light is transmitted because the thickness is less than 00 Å, so that the light-transmitting tent sheet of the present invention, which has a heat-shielding function, is lightweight, has strong piercing strength, and is durable.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester sheet used in the present invention or the sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst preferably has a thickness of 100 to 500 μm, and 200 to 4 μm.
00 μm is more preferred. If the thickness is less than 100 μm, the strength as a tent sheet becomes insufficient, and
If it exceeds, it becomes rigid and the handleability decreases.

The ethylene / α-olefin copolymer produced using the above-mentioned metallocene catalyst is a copolymer of ethylene produced using a known metallocene catalyst and an α-olefin having 3 or more carbon atoms. Among them, a copolymer of ethylene and an α-olefin having 6 or more carbon atoms is preferable as a tent sheet because of its strong piercing strength.

An aluminum vapor-deposited layer is provided on one side of the above-mentioned polyester sheet or a sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst. As a method for forming the aluminum vapor-deposited layer, any of known vacuum vapor-deposition methods, sputtering methods, and the like can be adopted. The thickness of the deposited aluminum layer is 100 to 300 Å, preferably 150 to 250 Å. If the thickness is less than 100 angstroms, the reflectivity of infrared rays sharply decreases, and it is difficult for industrial production to form a uniform deposited layer. On the other hand, if the thickness exceeds 300 angstroms, the transmittance of visible light rapidly decreases, which is not preferable.

The surface of the polyester sheet or the sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst is preferably subjected to a corona discharge treatment before forming an aluminum vapor-deposited layer. The surface tension is preferably adjusted to 35 dyn / cm or more by corona discharge treatment.

[0010] When a polyester sheet obtained as described above or a sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst and provided with an aluminum vapor-deposited layer on the surface thereof is used as a tent sheet, In addition to visible light transmittance and heat shielding,
Since corrosion resistance and wear resistance are required, and practical performance such as antifouling properties is also required, a protective layer must be provided.

The polyethylene used in the protective layer includes low-density polyethylene, linear low-density polyethylene, an ethylene / α-olefin copolymer produced using a metallocene catalyst, an ethylene-vinyl acetate copolymer,
Polyethylene commonly used by an extrusion lamination method such as an ethylene-ethyl acrylate copolymer is preferably used. Among these, ethylene-α-olefin copolymers produced using metallocene catalysts, especially copolymers of ethylene produced using metallocene catalysts and α-olefins having 6 or more carbon atoms have strong piercing strength, preferable.

The thickness of the protective layer is preferably from 10 to 100 μm. If the thickness of the protective layer is less than 10 μm, it is difficult to produce a uniform protective layer.

[0013]

【Example】

Example 1: 300 made of polyester as base sheet
A μm sheet was selected, the surface was subjected to a corona discharge treatment, and aluminum was vacuum-deposited to form a deposited layer having a thickness of 200 Å. An ethylene-hexene-1 copolymer produced using a metallocene catalyst was selected on the surface of the vapor-deposited layer, and was coated with a thickness of 15 μm by an extrusion lamination method to form a protective layer. The obtained sheet was subjected to edge processing, and eyelets were cast to obtain a tent sheet. From this tent sheet, a commercially available tent frame having a width of 5.4 m, a depth of 3.6 m and a height of 2.2 m was covered with the tent sheet. The temperature and illuminance near the ceiling inside the tunnel were measured on a sunny day in October.
When the outside air temperature was 26 ° C., the temperature inside the tent was 23.5 ° C., and when the outside air illuminance was 50 × 10 ³ lux, the illuminance inside the tent was 19 × 10 ³ lux.

Example 2 The procedure of Example 1 was repeated except that a sheet made of an ethylene / hexene-1 copolymer produced using a metallocene catalyst was used as a base sheet. When the outside air temperature is 26 ° C, the temperature inside the tent is 23.7
When the ambient temperature was 50 ° C. and the ambient illuminance was 50 × 10 ³ lux, the illuminance in the tent was 19 × 10 ³ lux.

Comparative Example 1: The thickness of the aluminum deposition layer was 3
The same procedure as in Example 1 was performed except that the thickness was changed to 50 Å. When the outside air temperature is 26 ° C, the tent temperature is 23.0
C., but when the ambient air illuminance was 50 × 10 ³ lux, the illuminance in the tent was 4 × 10 ³ lux. As a result, although there was a heat shielding effect, the light transmittance was insufficient and the inside of the tent was dark, which was not practical.

Comparative Example 2: The thickness of the aluminum deposition layer was set to 8
The operation was performed in the same manner as in Example 1 except that the thickness was changed to 0 Å. When the illuminance of the outside air was 50 × 10 ³ lux, the illuminance in the tent was 26 × 10 ³ lux, but when the outside air temperature was 26 ° C., the temperature in the tent was 25.5 ° C. As a result, the light transmittance was sufficient, but the heat shielding effect was insufficient and a comfortable environment could not be obtained.

[0017]

Industrial Applicability The present invention takes advantage of the mechanical properties such as transparency and puncture strength of a polyester sheet or a sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst, and has a thickness of 100 to 500 μm.
A bright, comfortable temperature environment is obtained by providing a 100-300 angstrom thick aluminum vapor-deposited layer that transmits visible light and shields infrared light on one side of a sheet of m. You can get a tent sheet with a certain.

[Brief description of the drawings]

FIG. 1 is a sectional view of a light-transmitting heat shielding tent sheet of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Light-transmitting heat shielding tent sheet 2 Polyester sheet or a sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst 3 Aluminum vapor-deposited layer 4 Polyethylene protective layer

Claims (1)

[Claims] 1. A polyester sheet or a sheet made of an ethylene / α-olefin copolymer produced using a metallocene catalyst, on one side of which a 100 to 300 Å-thick aluminum vapor-deposited layer is provided, and a polyethylene protection layer is provided thereon. A light-transmitting heat shielding tent sheet, comprising a layer.