JP2003251715A - Method for working rectangular bottom of cold insulation and heat insulation bag and its product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost cold insulation and heat insulation bag with a rectangular bottom which is hardly broken and tough and to provide a method for manufacturing the same. <P>SOLUTION: A method for working the rectangular bottom of the cold insulation and heat insulation bag comprises the steps of doubling a composite sheet 2 obtained by vapor-depositing an aluminum on one side surface of a flexible heat insulation sheet 2a in a longitudinal direction with the sheet 2a side disposed inside, heat-sealing both side ends of the doubled sheet 2 to be formed in a bag-like state, covering the sheet 2 of the bag-like state in a mold for working and holding the bottom, forming the bottom 5, forming triangular protrusions 7 at both side ends, folding the protrusions 7 on the bottom 5 surface, adhering an adhesive tape 8 in a bottom width direction, and manufacturing the bag 1 of the rectangular bottom. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a corner bottom of a heat insulation bag for keeping refrigerated items such as meat, ice cream, and cakes or frozen foods while keeping them cold, and a product thereof.

[0002]

2. Description of the Related Art If you buy cold foods such as meat and ice cream and frozen foods, you can carry them in plastic bags or shopping bags if you want to take them home without spending a lot of time. However, there is a problem that the quality of purchased foods and frozen products is deteriorated especially in summer when the temperature is high. Therefore, it is necessary to use a portable container or a cold bag containing a cold storage agent such as dry ice or a cold storage agent. However, if you plan to purchase frozen foods in advance, you may carry the above-mentioned portable containers, cold bags, etc., but they are bulky, and it is inconvenient to carry them around at all times. 2. Description of the Related Art In recent years, a corner bottom type cold-insulating bag having a simple structure that can be folded and compactly stored to make it convenient for customers to take home has been developed (see, for example, JP-A-10-180905). Also,
In some cases, this type of cold storage bag is provided as a service at retail stores.

FIG. 4 is disclosed in Japanese Patent Laid-Open No. 10-180905.
As shown in, heat-insulating sheet 26 that can be heat-sealed
The composite sheet 25 obtained by sticking the flexible exterior sheet 27 on one surface of the sheet is folded in two to heat-bond the abutting portions at both ends, and triangular protrusions are formed at both lower ends of the heat-sealed seal portion 29. The portion 30 is provided by folding, the root of the protruding portion 30 is cut off, and at the same time, heat fusion is performed to form a corner bottom portion, a bottom floor is provided at the corner bottom portion of this bag, and a pair of plastic handles 31 is joined to the opening portion. Hand-held cool bag 4
0 is described. The pair of plastic handles 31 are provided with wart-shaped engaging projections and engaging holes on opposite surfaces thereof so as to engage them with each other and close the opening of the bag to maintain cold insulation and heat retention. there were.

[0004]

However, in the case of the rectangular bottom cold insulation bag according to the conventional manufacturing method, when an article is put into the cold insulation bag, the bottom portion is pulled downward by the load, and the triangular protrusion 30 is cut off. Then, the bottom seal that was heat-sealed peeled off,
The drawback is that the bag is broken. The inventor
In view of such an actual situation, the present invention provides an inexpensive rectangular bottom cold-insulating bag and a method for processing a rectangular bottom that can be manufactured by a simple process while the bottom is resistant to shaking.

[0005]

In order to solve the above-mentioned problems, the first aspect of the present invention is to provide a composite sheet in which a heat insulating sheet is arranged on the inner side and a ray barrier sheet is arranged on the outer side, and the heat insulating sheet side is arranged. After folding inward in the length direction and heat-sealing both ends of the folded sheet to make a bag, the bag is turned upside down and the bag is provided with a plurality of air vent holes on the surface. The bottom of the bag is formed into a square shape by covering it with a shaped holding die, and at the same time, a triangular protrusion is formed on the heat-sealing side of the bag, and then the triangular protrusion is folded over the upper surface of the holding die. However, the corner bottom of the heat insulation bag is processed by sticking adhesive tape in the width direction of the bottom so as to straddle the triangular protrusion and the bottom of the bag. Is the way.

A second aspect of the present invention is that the holding die used in the first aspect of the invention is a hollow hexahedron having legs at the bottom, and at least two front and rear surfaces and an upper surface for venting air. The corner bottom processing method for a cold-retaining bag according to claim 1, wherein a plurality of are provided.

In a third aspect of the present invention, a composite sheet obtained by arranging a heat insulating sheet on the inside and a light barrier sheet on the outside is laminated and folded in the length direction with the side of the heat insulating sheet inside. A cold and heat-retaining bag formed by heat-sealing both ends of a sheet, wherein the bag bottom is expanded into a square shape and at the same time a triangular protrusion is provided on the heat-sealing side of the bag, and the triangular protrusion is formed. A rectangular bottom heat insulation bag, characterized in that an adhesive tape is attached in the width direction of the bottom so that the portion is folded over the rectangular bag bottom and straddles the triangular protrusion and the rectangular bag bottom. Is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. Reference numeral 1 is a body for keeping cold and warm, which has a heat insulating sheet 2a on the inside and a light ray barrier sheet 2b on the outside.
The composite sheet 2 in which the sheets are arranged and laminated is folded in the lengthwise direction with the heat insulating sheet side facing inward, and both side edges of the folded sheet are heat-sealed to form a bag. This composite sheet has a structure in which a heat insulating sheet and an exterior sheet as described below are laminated, and the composite sheet has a five-layer structure as a whole. The heat insulating sheet is composed of a polyolefin-based sealant layer, for example, a 10 μm-thick film made of high-density polyethylene (HDPE), and a polyolefin foam having heat insulation and flexibility, for example, foamed polyethylene (foamed PE), in order from the inside. It has a cushioning material layer having a thickness of 1 mm.
The exterior sheet is a light barrier layer in which aluminum is vapor-deposited on a base material layer made of low-density polyethylene having a thickness of 15 μ, and polyethylene terephthalate (PET) having a thickness of 12 μ
The coating layers are sequentially laminated.

FIG. 1 is a process chart showing a method for manufacturing a cold and heat retaining bag according to the present invention. As shown in FIG. 1B, the heat insulating layer 2a
And the composite sheet 2 is folded in two with the inside facing. The left and right ends of the folded composite sheet 2 are heat-sealed to form a bag shape as shown in FIG. 1 (c).
By heat-sealing the left and right ends of the laminated composite sheet 2, the heat-sealing portions 3 are formed on the left and right sides of the bag body 1.

Next, the opening 4 at the upper end of the bag body 1 is expanded, the bag is turned upside down, and the opening 4 is directed downward. Figure 1
As shown in (d), the bag body 1 is put on a rectangular parallelepiped holding die 9 for processing the bag into a square bottom. The holding die 9 has a substantially rectangular parallelepiped shape having a plurality of air vent holes 9a on the surface.
More specifically, the holding mold 9 is made of wood, plastic, steel, or the like, is molded into a hollow hexahedron, and has legs 9b at the bottom, as shown in FIG. A plurality of holes 9a for venting air are provided on at least two front and rear surfaces and the upper surface of the hollow hexahedron. Of course, it may be provided on the entire surface of the holding mold. The corners of this hexahedron are
In order to prevent the bag from being scratched during processing, it is preferable that the bag is processed into a so-called rounded corner (marked with R).

As shown in FIG. 1 (e), the cold and heat retaining bag 1
Deforms according to the outer shape of the holding mold 9 to form the bag bottom 5 into a rectangular shape, and at the same time, a triangular protrusion 7 is formed on the heat-sealing side 3 of the bag. As shown in FIG. 1 (f), the triangular protrusion 7 is folded over the rectangular bag bottom 5 and extends in the bottom width direction so as to straddle the triangular protrusion 7 and the rectangular bag bottom 5. Adhere the adhesive tape 8.

FIG. 3 is a perspective view of a cold-keeping and heat-insulating bag processed into a square bottom as seen from the bottom side. In the conventional method, as shown in FIG. 4, the roots of the triangular protrusions 30 were cut off at the lower ends of the bottom portion and heat fusion was performed at the same time. However, in the present invention, the protrusions are not cut out and the triangular shape is removed. Since the corner bottom 5 is folded over the bag bottom 5, the sheets 2 are triple-layered to increase the strength, and by attaching the tape 8, the strength of the bottom portion is further strengthened and the bottom portion is less likely to shake. Get tough.

Many frozen foods are angular,
It is also difficult to store cylindrical cakes, ice cream, etc. in gussetless bags. The square bottom cold insulation bag of this embodiment is easy to put in, and the bottom is tough and is not easily broken.

The bag of the present invention is not limited to refrigerated items and frozen foods, and even if foods such as pizza and bento that need to be kept warm are stored, the bag can be kept warm while being carried due to the heat insulating property of the bag. You can

[0015]

As described above, according to the present invention, the bottom portion is strong and does not easily shake, and compared with the conventional processing method, the protrusion is cut off and heat-sealed. It is possible to manufacture an inexpensive corner bottom cold insulation bag.

[Brief description of drawings]

FIG. 1 is a process drawing showing a method for manufacturing a cold and heat retaining bag according to the present invention.

FIG. 2 (a) is a perspective view of a square bottom machining and holding mold used in the above manufacturing method. (B) is the sectional view.

FIG. 3 is a perspective view seen from the bottom side of an embodiment of the cold insulation bag according to the present invention.

FIG. 4 is a process diagram showing a conventional method for producing a cold-retaining bag.

[Explanation of symbols]

1 bag body 2 composite sheets 2a heat insulation layer 2b layer 3 Thermal fusion part 4 openings 5 corner bottom 7 Triangular protrusion 8 Adhesive tape 9 Square bottom processing holding type 10 Air vent holes

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 33/01 B65D 33/01 65/16 65/16 65/40 65/40 A 81/30 81/30 B 81/38 81/38 HF term (reference) 3E064 AB03 BA17 BA24 BB03 BC03 BC13 EA01 FA01 GA04 HD02 HF06 HG07 3E067 AB01 AB20 BA12A BB12A BB14A BB15A BB17A BB25 DD510105 DD47 GA03 3E086 AA23 AC07 AC31 AD01 BA04 BA13 BA15 BB21 BB37 BB51 CA01 CA40 DA08

Claims (3)

[Claims] 1. A composite sheet obtained by arranging a heat insulating sheet on the inside and a light ray barrier sheet on the outside, and folding the composite sheet in the lengthwise direction with the heat insulating sheet side facing inward. After heat-sealing and bag making, the bag is turned upside down to cover the bag with a substantially rectangular parallelepiped holding die having a plurality of air vent holes on the surface, thereby forming the bag bottom into a rectangular shape and at the same time. Forming a triangular projecting portion on the heat-sealing side, then, while folding the triangular projecting portion on the upper surface side of the holding mold, so as to straddle the triangular projecting portion and the rectangular bag bottom, A method for processing a corner bottom of a cold-keeping heat-insulating bag, which comprises sticking adhesive tape in the width direction of the bottom to process the corner bottom of the heat-insulating bag. 2. The holding die is a hollow hexahedron, has legs in a lower portion, and has a plurality of holes for venting air at least on two front and rear surfaces and an upper surface. Item 2. A method for processing a square bottom of a cold insulation bag according to Item 1. 3. A composite sheet obtained by arranging a heat insulating sheet on the inner side and a light ray barrier sheet on the outer side, and folding the composite sheet in the length direction with the heat insulating sheet side being the inner side, and the both ends of the folded sheet are A cold and heat-retaining bag heat-sealed to form a bag, and at the same time when the bag bottom is expanded into a square shape and formed, a triangular protrusion is provided on the heat-sealing side of the bag, and the triangular protrusion is formed on the rectangular bag bottom. A corner bottom cold insulation bag, which is formed by folding it up and sticking an adhesive tape in the width direction of the bottom so as to straddle the triangular protrusion and the bottom of the rectangular bag.