JP2002173181A - Cold-insulation bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold-insulation container which has a high cold-insulating performance, whose strength is improved, which can withstand practical use over a long period of time or a large number of repeated uses, and which is capable of being portably transported. SOLUTION: The cold-insulation bag is formed into the shape of a bag (2) by sewing a sheet-like composite material having a heat insulating performance and an infrared ray reflecting performance, and is made closable by mounting an opening/closing slide fastener (7) to an upper part of the bag. As the sheet- like composite material, a laminated sheet (1) is employed which is formed by laminating a polyethylene film (4) having on its surface an aluminum vapor- deposited layer (5) on one of faces of a cloth (3) made by plain weaving fine oriented tapes of a polyethylene in such a manner as to dispose the vapor- deposited layer externally of the cloth (3) and by laminating a three-layer constituent plastic cellular sheet (6) on the other face of the cloth (3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated bag, which is in the form of a handbag, and which can keep articles put therein at a low temperature.

[0002]

2. Description of the Related Art An article formed by laminating a material formed by laminating a sheet of foamed plastic, for example, foamed polyethylene, and a plastic film having an aluminum vapor-deposited layer on one side, by adhering or sewing, is contained in the bag. Is used as a cool bag for keeping the temperature low. For example, it is used to carry ice cream along with dry ice or to carry cold drinks in cans or bottles. Needless to say, the aluminum layer on the surface reflects heat rays coming from the outside, and the foamed plastic acts as a heat insulating material.

[0003] However, the cooling performance of such a cooling bag is not so high. This is because the thickness of the foamed plastic sheet is limited to at most 1 to 2 mm due to a restriction due to its manufacturing technology. Another drawback of this cool bag is that it is vulnerable to shocks applied from inside and outside of the bag, and that it has a low so-called piercing strength, which withstands particularly the impact of angular articles. For this reason, such a cool bag is used only in a situation where extremely high cool performance is required and transport conditions are not severe, and at present, it is discarded after being used almost once.

[0004] As a simpler means for keeping cool, bags made of plastic foam sheets are also used. `` Plastic foam sheet '' is a method in which a film obtained by extrusion of polyethylene or the like is vacuum formed and a cap film formed with a number of dents and a flat back film are adhered on the bottom surface of the cap to form a number of sealed air It is a processed product that forms a chamber. It is usually used as a cushioning wrapping material, but it also has a heat insulating effect, so it is also used to keep warm and cool. However, since a conventional cap film / back film two-layered bubble sheet has insufficient heat insulating effect, the top of the cap is connected, and another flat film, a liner film, is adhered to the two flat sheets. A bubble sheet having a three-layer structure is used so that the air between the various films is substantially sealed.

[0005] Cooling bags made of plastic foam sheets are also unsatisfactory in cooling performance. Although the thickness of the sealed air layer ranges from 4 to 7 mm, it is inevitable that some convection occurs inside. Of course, there is no heat ray reflection effect of the aluminum deposition layer. The strength is also insufficient.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to improve the cooling performance of the present cooling bag and to improve the strength of the bag. It is to provide a possible container.

[0007]

SUMMARY OF THE INVENTION The cool bag of the present invention comprises:
FIG. 1 shows the entire structure, and FIGS. 2 and 3 show the layer structure of the composite material constituting the structure. That is, the present invention is a cold storage bag in which a sheet-like composite material having heat insulation performance and infrared reflection performance is sewn into a bag-shaped composite material (2), and a slide fastener (7) for opening and closing is attached to an upper portion thereof so as to be almost airtight. A cloth formed by plain weaving a thin stretch tape of polyethylene as a sheet-like composite material (3)
Is laminated on one side with a polyethylene film (4) having an aluminum vapor deposition layer (5) on the surface with the vapor deposition layer outside, and on the other side, a three-layer plastic foam sheet (6) is laminated. Characterized in that a laminated sheet (1) comprising:

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The shape and size of the cold storage bag are arbitrary and can be selected from a wide range. As shown in FIG. 1, both sides or both ends of the bag are provided with reinforcing cloths (8). ) Is provided, and a hand (9) is attached thereto.

[0009] The polyethylene cloth is a product obtained by extruding polyethylene from an annular die into a flat tape, tearing the stretched product to an appropriate small width, and plain weaving the obtained yarn into a cloth. Since the yarn has a high tensile strength due to strong stretching, this cloth has a high piercing strength and a high rigidity in the surface direction.

Since a plastic film having one surface subjected to aluminum deposition is used in a wide range of fields, an appropriate one may be selected from commercially available products. For plastic, polyethylene is advantageous because of the convenience of bonding.

A commercially available product may also be used for the three-layer plastic foam sheet. To bond a polyethylene cloth, an aluminum vapor-deposited film and a three-layer plastic foam sheet to form a composite material, any means such as heat fusion and dry lamination can be selected.

[0012]

EXAMPLES The following materials were prepared. Polyethylene cloth: a cloth woven with a 3 mm wide yarn obtained by strong stretching of polyethylene Plain aluminum vapor-deposited film: One side of a 30 μm-thick polyethylene film was subjected to aluminum vapor deposition Thing Three-layer plastic foam sheet: Cap diameter 7m
Product having a height of 4 mm, a staggered arrangement and a pitch of 11 mm A film of molten polyethylene extruded from a T-die was sandwiched between each layer, so that three layers were laminated at a time.

The composite material thus obtained was sewn into a bag having the shape shown in FIG. The dimensions of the bag are 28.5c in length
m, height 27 cm, bottom width 16 cm, on one side,
It is also made of the same composite material, with pockets. When viewed from the end, it is triangular and the top is made of plastic slide fasteners, which can be close to closed.

For comparison, bags of the same size were sewn with a laminate of a conventional foamed polyethylene sheet and an aluminum vapor-deposited film, or with a three-layer plastic foam sheet which is one of the composite materials.

[0015] Length 20cm, width 12cm, depth 15cm
Prepare three aluminum vats, put 10 pieces of ice pieces of the same size made in an ice-making room of a refrigerator and 300 ml of cold water at a temperature close to 0 ° C. into each of these vats. It was housed in a bag and the slide fastener was closed. Leave in a room with a temperature of about 25 ° C for 30 minutes or 15 minutes.
The zipper was briefly opened every minute and observed, and the time taken for all the ice pieces to melt was recorded. The results were as follows: Insulated bag of the present invention 2 hours 30 minutes Conventional insulated bag 1 hour 15 minutes Bubble sheet insulated bag 1 hour 15 minutes

[0016]

The cool bag of the present invention is formed by sewing a bag with a composite material having a layer structure of an aluminum vapor-deposited film / polyethylene cloth / three-layer plastic foam sheet, and makes the bag close to hermetically by a slide fastener. As a result, it is not only superior in cold insulation performance than a bag with a bubble sheet alone, but also higher in performance than a conventional cold insulation bag made of an aluminum vapor-deposited film / foamed plastic material.

This composite material has a high piercing strength, and there is little danger of puncturing even if the angular article is contained in the bag or touches the angular article during use.

By appropriately designing the shape of the bag and applying a reinforcing material such as webbing to important points, it can withstand the transportation of heavy goods. Therefore, when carrying cold drinks such as canned beer and canned juice, for example, In a normal environment, it can be used for a long time without replenishment of the coolant, and its use is wide.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one example of a cool bag of the present invention.

FIG. 2 is a partially cutaway plan view showing a layer structure of a composite material constituting the cold storage bag of the present invention.

FIG. 3 is a sectional view showing a layer structure of the composite material of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet-shaped composite material (laminated sheet) 2 Bag 3 Polyethylene cloth 4 Polyethylene film 5 Aluminum vapor deposition layer 6 Plastic foam sheet of three layers 7 Slide fastener 8 Power cloth 9 Supplier

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA11 BA12A BB25A CA18 EE15 EE38 FC01 GA01 4F100 AB10C AK01D AK01E AK04A AK04B BA05 BA07 BA10C BA10E DA01 DG11A DJ01D DJ01E EA02A EH17 EH172K16 JJ

Claims (2)

[Claims] An insulated bag in which a sheet-shaped composite material (1) having heat insulation performance and infrared reflection performance is sewn to a bag (2), and a slide fastener (7) for opening and closing is attached to an upper portion thereof so that the bag can be substantially sealed. A polyethylene film (4) having an aluminum vapor-deposited layer (5) on one surface of a cloth (3) formed by plain weaving a thin stretch tape of polyethylene as a sheet-like composite material, Characterized by using a laminated sheet obtained by laminating a plastic foam sheet (6) having a three-layer structure on the other surface. 2. The cold-insulated bag according to claim 1, wherein a webbing (8) for reinforcement is provided on both side surfaces or both end surfaces of the bag, and a hand (9) is attached thereto.