JP2002205776A - Heat insulating bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating bag suitable for transportation, i.e., for home delivery or for shopping which is superior in a low temperature or high temperature insulating characteristic, is superior in preventing condensation in the bag owing to transpiration from its contents and which is superior in keeping cold temperature. SOLUTION: This heat insulating bag comprises at least three layers. The surface layer is a fiber structure and the thickness of which is from 0.5 mm to 0.9 mm and the weight of the same is from 300 to 450 g/m2. The intermediate layer is made of a heat insulating material made of a porous or non-woven textile and the thickness of which is from 20 mm to 50 mm. The inner lining layer is made of a fiber structure having weight ranging from 90 to 115 g/m2 and air permeability from 5 to 30 cm3/cm2/second.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating bag having a structure having three or more layers. In particular,
The present invention relates to a heat-insulating bag for transportation, which is excellent in keeping warm, keeping cool and preventing dew condensation although it is warm, such as pizza and lunch, and cold, such as ice cream and frozen food, and is suitable for home delivery and shopping.

[0002]

2. Description of the Related Art Conventionally, heat insulation bags used for home and shopping purposes for keeping warm and cool have a two-layer structure of a porous layer containing air such as urethane foam and a synthetic resin film layer. Many adopt a three-layer structure including an aluminum vapor-deposited film layer. For example, Japanese Patent Application Laid-Open No. Hei 10-258882 discloses a thin heat-insulating bag in which a porous layer as an intermediate layer is made of a nonwoven fabric.

[0003] However, there is a problem that the air-permeable intermediate layer is sandwiched between the highly confidential film layers, resulting in poor air permeability and easy formation of dew. In particular, when a metal vapor-deposited film layer with heat ray reflection performance is used, it is highly confidential and highly breathable, although it has excellent protection against radiant heat radiation from the contents and shielding of radiant heat from the outside into the heat insulation bag. There is no condensation, moisture evaporating from the high-temperature contents dew inside the bag,
In addition, there has been a problem that the humidity inside the bag also increases, resulting in damage to the contents. In addition, in the case of low-temperature contents, there is a problem that dew forms on the outside of the heat-insulating bag, which deteriorates heat retention and wets clothes.

There is a method of arranging ventilation holes to prevent this dew condensation. However, there has been a problem that heat transfer to the outside occurs due to convection through the ventilation holes, so that the temperature of the contents tends to change.

Further, there is a method of preventing dew condensation by arranging a water-absorbing material such as paper. However, the material which has absorbed water cannot be easily dried, and is used repeatedly such as home delivery or shopping. There was a problem that was not suitable for.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to provide excellent heat insulating properties such as heat and cold insulation, and to prevent dew condensation in a bag due to moisture evaporating from the contents. Another object of the present invention is to provide a heat insulating bag which is excellent in maintaining low humidity and is suitable for transportation such as home delivery and shopping.

[0007]

The heat-insulating bag of the present invention is a heat-insulating bag having at least a three-layer structure of a skin layer, an intermediate layer and a lining layer, wherein the skin layer has a thickness of 0.5 to 0. .9m
m, a fibrous structure with a basis weight of 300 to 450 g / m ² , the intermediate layer is made of a heat insulating material made of a porous material or a nonwoven fabric having a thickness of 20 to 50 mm, and
~115g / m ^2, characterized in that it consists of air permeability 5~30cm ³ / cm ² / sec of the fiber structure. Further, it is preferable that the fiber structure of the skin layer contains hollow fibers having a hollow ratio of 25 to 40% by 50% or more by weight and has a urethane resin coat.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The heat-insulating bag of the present invention is a heat-insulating bag having a layer structure, in which at least three layers of a skin layer, an intermediate layer and a lining layer are sequentially arranged from the outside. .

The skin layer has a thickness of 0.5 to 0.9 m.
m, a fiber structure having a basis weight of 300 to 450 g / m ² . When the thickness and the basis weight are large, the weight and the weight are large, and the handling property is reduced. On the other hand, if it is smaller, the heat retention is reduced, and the heat insulation becomes insufficient. Further, the density is preferably in the range of 0.4 to 0.8 g / cm ³ . Further, when the fiber structure is a woven fabric, the cover factor is preferably in the range of 2600 to 3200. If the density or the cover factor is larger than this range, the heat retention performance tends to decrease due to a decrease in the amount including air. On the other hand, if the density or the cover factor is smaller than this range, the wind from the outside will directly hit the intermediate layer, and the heat retention performance tends to be reduced.

[0010] The fiber structure of the skin layer includes a woven fabric, a knitted fabric,
Or it may take any form as long as it is a sheet-like material made of fibers such as a non-woven fabric, and if there is a gap between fibers mainly with fibers, a binder made of a high polymer is contained. Is also good. However, from the viewpoint of workability such as cutting the sheet and sewing it into a bag, it is preferable to use a woven fabric, a knitted fabric, or a non-woven fabric having a high entanglement degree or a entanglement point bonded with a binder. Further, a woven or knitted fabric is preferable from the viewpoint of balance between durability, strength, and weight reduction.

The fiber structure of the skin layer has a hollow ratio of 25%.
It is preferable to contain ４０40% of hollow fibers by weight, not less than 50%, more preferably not less than 80%. When fibers having a hollow ratio of less than 25% are used or when the weight is less than 50%, the heat retention tends to decrease. In addition, the hollow ratio is 40
%, The hollow fibers tend to crack more often, failing to hold air and tending to lower the heat retention.

Further, in order to prevent the contents from getting wet by rain, it is preferable that the skin layer is subjected to a moisture-permeable and waterproof treatment. For example, a laminate of a moisture-permeable polyurethane film or the like, a resin-coated resin such as urethane, or a moisture-permeable waterproof fabric treated with a silicon-based or fluorine-based water-repellent treatment is preferable. In particular, it is preferable to coat a moisture-permeable urethane resin on the inner side of the skin layer, since dew condensation on the surface is prevented and the heat retaining property is enhanced.

The intermediate layer of the heat insulating bag of the present invention has a thickness of 20 to 5
It is made of a heat insulating material made of a 0 mm porous material or a nonwoven fabric. In particular, urethane sponge is preferable as the heat insulating material from the viewpoints of moldability and compression elastic recovery. Further, if the thickness of the heat insulating material is less than 20 mm, the amount of heat exchange with the outside air is increased, and the heat retention / cooling performance is reduced. Conversely, when the thickness of the heat insulating material exceeds 50 mm, the amount of heat exchange with the outside air is small and the heat retention / cooling property is excellent, but the moisture permeability is low, and dew condensation in the bag is likely to occur due to moisture evaporated from the contents. . Also, depending on the material, the density of the heat insulating material is 0.01 to 0.05 g based on the balance between heat retention and moisture permeability.
/ Cm ³ is preferred.

The inner lining layer, which is the innermost layer, has a basis weight of 90 to 11
It is a fiber structure having 5 g / m ² and air permeability of 5 to ³⁰ cm ³ / cm ² / sec. The fiber structure of the lining layer, like the skin layer, may take any form as long as it is a sheet made of fibers such as woven fabric, knitted fabric, or non-woven fabric. As long as there is a void, a binder made of a high molecular polymer may be contained. But,
It is preferable to use a woven or knitted fabric from the viewpoint of workability such as cutting and sewing the sheet into a bag, and furthermore, from the viewpoint of balance between durability, strength, and weight reduction.

In order to prevent condensation in the bag according to the present invention, the air permeability of the fiber structure of the lining layer is 5 cm ³ / c.
m ² / sec or more, and moreover 15 c
It is preferably at least m ³ / cm ² / sec. If the air permeability is less than 5 cm ³ / cm ² / sec, moisture evaporating from the contents is not permeated, and dew condensation easily occurs on the innermost part of the bag, which may damage food. On the other hand, if the air permeability exceeds 30 cm ³ / cm ² / sec, heat tends to move from the lining layer to the heat insulating material, and the heat retention / cooling property tends to decrease, so the air permeability is 30 cm ³ / cm. It is suitably not more than cm ² / sec, preferably not more than 25 cm ³ / cm ² / sec.

When the thickness and the basis weight of the fiber structure of the lining layer are larger, the fiber structure becomes heavier and heavier, and the handleability is reduced. On the other hand, if it is smaller, the heat retention is reduced, and the heat insulation becomes insufficient. The thickness is preferably in the range of 0.1 to 0.2 mm, and the density is preferably in the range of 0.5 to 1.0 g / cm ³ . Further, when the fiber structure is a woven fabric, the cover factor is preferably in the range of 1600 to 2200. If the density or the cover factor is larger than this range, the heat retention performance tends to decrease due to the decrease in the amount of air, and the air permeability tends to decrease more than necessary. If the density or the cover factor is smaller than these ranges, the air permeability is too high, and the effect of preventing dew condensation tends to decrease.

In order to satisfy the characteristics of the above-mentioned lining layer, for example, a polyester multifilament of 110 dtex / 48 filament is used for the warp and 8
Using a polyester multifilament of 0 dtex / 36 filaments, the weaving density was 80 to 1 for each process.
It is obtained by weaving a plain woven fabric set at 15 / inch and 90 to 125 / inch.

The heat insulating bag of the present invention has at least the above-mentioned layer structure of the skin layer, the intermediate layer, and the lining layer.
A moisture permeable film or the like may be further inserted between the respective layers.

Next, an example of the heat insulating bag of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the heat insulating bag of the present invention, and FIG.
1 is a cross-sectional view of the heat insulating bag of the present invention. From the fiber structure of the skin layer and the lining layer described above, three members of (1) an upper part, (2) a bottom part having a side part and a lid part in only one direction, and (3) another side part are cut out, and a skin layer is cut out. The above-mentioned heat insulating material was inserted as an intermediate layer between the inner layer and the inner layer, and each was sewn. Thereafter, (1) the top and (3) the other side where the heat insulating material is sealed are sewn, and (3) the other side and the bottom of (2) are sewn. Further, a heat insulating bag can be obtained by attaching a Velcro tape to the lid part of (2) and the upper part of (1). FIG. 2 shows (4) a skin material serving as a skin layer, (5) a heat insulating material serving as an intermediate layer, and (6) a lining material serving as a lining layer.

[0020]

The present invention will now be described in more detail with reference to Examples and Comparative Examples, which by no means limit the present invention.
The physical properties in the examples were measured by the following methods.

(1) Air permeability Air permeability was measured according to JIS L 1096 8.27.1 method.

(2) Thickness The thickness was measured in accordance with JIS L 1096 8.5.1.

(3) Heat retention The heat retention is achieved by placing a paper box containing a pizza (about 25 cm in diameter) baked in an oven at 95 ° C. in an insulating bag of the present invention.
The temperature under the dough and the temperature inside the paper box of the pizza after being left for 30 minutes were measured and evaluated.

(4) Dew Condensation Prevention The dew condensation was determined by measuring the humidity in the paper box after a paper box enclosing a pizza (diameter of about 25 cm) baked in an oven was placed in a bag and allowed to stand for 30 minutes. The humidity in the delivery bag was measured and evaluated.

(5) Crispy (crisp texture) retention of pizza dough Crispy (crisp texture) of pizza dough is affected by temperature and humidity inside the bag. Therefore, the fact that the temperature and humidity were appropriately controlled was measured as the crispy maintenance. The crispness of the pizza dough was measured by placing a 95 ° C pizza (approximately 25 cm in diameter) baked in an oven in a paper box, placing the paper box in a bag, and leaving the pizza for 30 minutes. The pizza dough that felt the most crispy was scored as 8 points, and 7 points and 6 points in that order.
The points were scored as 5 points, 4 points, 3 points, 2 points, and 1 point, and the total score of the five persons was evaluated as the crispiness of the pizza dough.

Example 1 933.3 for both warp and weft yarns
The fabric woven at a density of 49 warps / inch and a weft of 32 wires / inch using a decitex / 92 filament polyester 33% hollow polyester multifilament has a basis weight of 42.
0 g / m ² , thickness 0.62 mm, density 0.68 g /
It was a mat fabric having a cover factor of 2867 cm ³ and a urethane resin coating on the inside, and used as a skin material to be a skin layer.

The heat insulating material serving as the intermediate layer has a thickness of 30 mm and a thickness of 5 mm.
A urethane sponge having a weight of 08 g / m ² and a density of 0.016 g / cm ³ was used in six directions in the bag.

The lining material used as the lining layer is 11
1.1 dtex / 48 filament polyester multifilament, 83.3 dtex / 3 weft
A plain fabric woven with a density of 86 filaments / inch and a weft of 102 filaments / inch using 6 filament polyester multifilaments was used. This fabric has a basis weight of 9
7.2 g / m ² , thickness 0.15 mm, density 0.65
g / cm ³ , cover factor is 1743, and 21c
It has an air permeability of c / cm ² / sec.

Using the skin material, the heat insulating material and the lining material, a heat insulating bag as shown in FIG. 1 was sewn. The size was 38 cm × 38 cm × 11 cm in length × width × height, and the overlap of the lid portion was 20 cm.

Table 1 shows the performance evaluation results of the obtained heat insulating bags. In Example 1, the temperature under the pizza and the temperature inside the paper box 30 minutes after the filling of the pizza were high, and the heat retention was good. Also,
The humidity in the carton and the humidity in the delivery bag were also kept low, no condensation was seen in the bag, and 3 out of 5 testers answered that the crispy feeling of the pizza dough was the highest crispy,
The remaining two also scored 7 points, giving a score of 38.

Example 2 The same fabric as the skin material used in Example 1 was used as the skin material. 45mm thick for insulation
With a basis weight of 760 g / m ² and a density of 0.016 g / cm ³
Urethane sponge was used in six directions in the bag. As the lining material, the plain fabric used in Example 1 was used. Using the skin material, the heat insulating material and the lining material, a heat insulating bag having the same size as that of Example 1 as shown in FIG. 1 was sewn. Table 1 shows the performance evaluation results of the obtained heat insulating bags. In Example 2, the temperature under the pizza and the temperature inside the paper box 30 minutes after filling the pizza were high, and the heat retention was good. Further, the humidity in the paper box and the humidity in the delivery bag were also low, and no dew was observed in the bag.
In addition, the crispy feeling of the pizza dough was as high as Example 1 with a high score of 31 points.

Example 3 The same fabric as the skin material used in Example 1 was used as the skin material. The urethane sponge used in Example 1 was used as a heat insulating material in six directions in the bag. The lining material is 111.1 dtex / 48 filament polyester multifilament for the warp and 83.3 for the weft.
Using a polyester multifilament of decitex / 36 filaments, 103 warps / inch and weft 12
A plain fabric woven at a density of 4 / inch was used. This fabric has a basis weight of 110 g / m ² and a thickness of 0.18 m.
m, density 0.61 g / cm ³ , cover factor 21
03 and has an air permeability of 8.0 cc / cm ² / sec. Using the above-mentioned skin material, heat insulating material and lining material, FIG.
A heat insulating bag having the same size as that of Example 1 as shown in FIG. Table 1 shows the performance evaluation results of the obtained heat insulating bags. In Example 3, the temperature under the pizza and the temperature inside the paper box 30 minutes after filling the pizza were good. Further, the humidity in the paper box and the humidity in the delivery bag were also kept low, and no dew was observed in the bag. In addition, the crispy feeling of the pizza dough was also high after Example 1 and Example 2 with a score of 27 points.

[Comparative Example 1] Polyester multifilaments having 1101.8 dtex / 92 filaments and a hollow ratio of 15% were used for both the warp and weft yarns.
Using a mat woven fabric having a basis weight of 800 g / m ² , a thickness of 0.98 mm, a density of 0.81 g / cm ³ and a cover factor of 2777, woven at a density of 9 lines / inch and a weft of 32 lines / inch, A urethane resin coating was applied on the inside. The urethane sponge used in Example 1 was used as a heat insulating material in six directions in the bag. The lining material is Example 1
The plain fabric used in the above was used. Using the skin material, the heat insulating material and the lining material, a heat insulating bag having the same size as that of Example 1 as shown in FIG. 1 was sewn. Table 1 shows the performance evaluation results of the obtained heat insulating bags. The temperature under the pizza and the temperature inside the paper box showing the heat retention were lower than those in the examples. In addition, no dew condensation was observed in the bag, but the crispness retention was 20 points.

[Comparative Example 2] The woven fabric used in Example 1 was used as a skin material, and the urethane sponge used in Example 1 was used as a heat insulating material in a thickness of 15 mm in six directions in a bag. Used the plain fabric used in Example 1 and sewed an insulating bag having the same size as Example 1 as shown in FIG. Table 1 shows the performance evaluation results of the obtained heat insulating bags. The heat retention was the lowest because the thickness of the urethane sponge, which is a heat insulating material, was reduced, and the humidity was kept low, but the crispy retention was 17 points.

Comparative Example 3 The woven fabric used in Example 1 was used as the skin material, and the urethane sponge used in Example 1 was used as the heat insulating material in a thickness of 55 mm in six directions in the bag. Used the plain fabric used in Example 1 and sewed an insulating bag having the same size as Example 1 as shown in FIG. Table 1 shows the performance evaluation results of the obtained heat insulating bags. The heat retention was the highest, but the humidity in the paper bag and the delivery bag were also high, and dew condensation was observed in the bag. The crispness of the pizza dough was 15 points.

Comparative Example 4 The woven fabric used in Example 1 was used as the skin material, and the urethane sponge used in Example 1 was used as the heat insulating material with a thickness of 25 mm. As a lining material, a polyester multifilament of 111.1 decitex / 48 filaments for a warp and a polyester multifilament of 83.3 decitex / 36 filaments for a weft are woven at a density of 124 warps / inch and 135 wefts / inch. A plain weave was used. This woven fabric has a basis weight of 128 g / m ² , a thickness of 0.22 mm, and a density of 0.2 g / m ² .
58 g / cm ³ , a cover factor of 2409, and an air permeability of 3.4 cc / cm ² / sec.

Using the above-mentioned skin material, heat insulating material and lining material, a heat insulating bag having the same size as that of Example 1 as shown in FIG. 1 was sewn. Table 1 shows the performance evaluation results of the obtained heat insulating bags. Although the heat retention was maintained high, the humidity in the paper bag and the humidity in the bag were the highest, and dew condensation was also observed in the bag. The worst crispness of the pizza dough was 12 points.

Comparative Example 5 The woven fabric used in Example 1 was used as a skin material, and the urethane sponge used in Example 1 was used as a heat insulating material in a thickness of 25 mm in six directions in a bag. The lining material used was a polyester multifilament of 111.1 dtex / 48 filaments for the warp and a polyester multifilament of 83.3 dtex / 36 filaments for the weft, and 75 warps / inch and 82 wefts /
A plain weave at an inch density was used. This fabric has a basis weight of 70.5 g / m ² , a thickness of 0.09 mm, a density of 0.78 g / cm ³ , a cover factor of 1460,
And it had an air permeability of 35.2 cc / cm ² / sec.

Using the above skin material, heat insulating material and lining material, a heat insulating bag having the same size as that of Example 1 as shown in FIG. 1 was sewn. Table 1 shows the performance evaluation results of the obtained heat insulating bags. The heat retention maintained a relatively high value, the humidity in the paper bag and the humidity in the delivery bag were also kept at the lowest, and no condensation was observed in the bag. However, the crispness of the pizza dough was 17 points.

[0040]

[Table 1]

[0041]

According to the present invention, it is suitable for home delivery and shopping, etc., which are excellent in heat insulating properties such as heat retention and cooling, and excellent in dew condensation prevention in bags due to moisture evaporating from the contents and low humidity maintaining property. A suitable insulating bag is obtained. In particular, since an insulating bag excellent in balance between heat insulation and air permeability can be obtained, a change in humidity due to a change in temperature in the bag can be suppressed by a suitable air permeability, for example, the temperature in the heat insulating bag decreases like a pizza. An insulation bag with high crispy retention can be obtained, while the crispy feeling is reduced when the humidity increases.

[Brief description of the drawings]

FIG. 1 is a perspective view of an insulating bag of the present invention.

FIG. 2 is a cross-sectional view of the heat insulating bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top part 2 Bottom part which has a side part only in one direction and a lid part 3 Other side parts 4 Skin material 5 Insulation material 6 Lining material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Yasui 3-4-1, Amihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center F-term (reference) 3E064 AD26 BA09 BA54 BA60 BB04 BC20 EA18 FA01 HD07 HE01 HM01 HN65 3E067 AA11 AB01 AC01 AC03 BA12A BB25A BB26A CA03 CA07 CA18 FA01 FC01 GA11

Claims (4)

[Claims] 1. A thermal insulation bag having at least a three-layer structure of a skin layer, an intermediate layer and a lining layer, wherein the skin layer has a thickness of 0.5 to 0.9 mm and a basis weight of 300 to 450 g / m ² . The intermediate layer is made of a heat insulating material made of a porous material or a nonwoven fabric having a thickness of 20 to 50 mm, and the lining layer is made to have a basis weight of 90 to 115 g / m ² and an air permeability of 5 to ³⁰ cm ^3.
A heat insulating bag comprising a fibrous structure of / cm ² / sec. 2. The fiber structure of the skin layer has a hollow ratio of 25 to 25.
2. The thermal insulation bag according to claim 1, comprising 40% or more of hollow fiber by 50% or more by weight. 3. The heat insulating bag according to claim 1, wherein the fiber structure of the skin layer has a urethane resin coat. 4. The thermal insulation bag according to claim 1, wherein the fiber structure of the lining layer is a woven fabric having a cover factor of 1600 to 2200.