JPH10245042A - Porous bag body, and heat generating body, deoxidation body, deodorization body, ripening body, desiccating agent, dehumidifying agent and sachet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous bag body and heat generating body, deoxidation body, deodorization body, ripening body, desiccating agent, dehumidifying agent and sachet using the same which are safe and highly reliable surely preventing the breakage of a seal layer, maintaining storing sealing performance and also preventing the leakage of contents, low temperature burn and staining clothes during use. SOLUTION: This porous bag body is made by overlaying two or more layers of porous base material 1 comprising a reinforcing draft layer 1a and a porous membrane 1b and one or more layer of coating material 2 comprising a heat seal layer 2b, and the periphery of the same is heat sealed by heat sealing the heat seal layer. the heat seal layers is made of polyethylene which is polymerized or copolymerized by a single site catalyst whose active site characteristics is even.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a porous bag for containing contents such as a heat-generating composition, an oxygen scavenger, a deodorant, a ripening composition, a desiccant, a moisture absorbent or a fragrance. Breakage of the sealing portion when heat-sealing the peripheral edge of the porous bag, with respect to the heating element, deoxygenating body, deodorizing body, ripening body, drying material, dehumidifying material and odor bag using the porous bag. A porous bag body, which prevents the occurrence of tears and through holes, thereby preventing leakage of contents and an excessive rise in temperature, thereby significantly improving yield, safety and reliability. Heating element, deoxygenated body, deodorized body, ripening body, drying material,
It relates to a dehumidifying material and an odor bag.

[0002]

2. Description of the Related Art Porous bags are used for heating elements, deoxidizers, deodorizers, ripeners, drying materials, dehumidifiers, odor bags, etc., but their air permeability is controlled according to their use. ing.

[0003] Specifically, for example, a disposable body warmer uses a heat generated by oxidation of iron powder by air to safely and inexpensively heat a local part of a human body. In this case, the air permeability is controlled to maintain the heat generation temperature at a constant value. For this air permeability control, a plastic film having a large number of pores of several μm or less is used.

By the way, this kind of porous bag is obtained by laminating at least two layers of a porous base material having a reinforcing air-permeable layer and a porous film and at least one layer of a covering material having a heat seal layer. The peripheral portion is formed by heat sealing with the heat sealing layer.

[0005] As the porous film, an inorganic fine powder (inorganic filler) such as fine calcium carbonate powder is mixed with a polyolefin resin, then formed into a film or sheet, and then stretched. One having fine pores formed around the inorganic fine powder may be mentioned.

As the reinforcing ventilation layer, a cloth such as a non-woven cloth or a woven cloth having a good texture is generally used to improve the feeling of use, and the cloth is bonded to one or both sides of the porous membrane. Thus, a porous substrate is formed. Examples of the nonwoven fabric include those formed of polyamide, polyester, rayon, or the like.

On the other hand, the coating material includes one or more layers having a heat seal layer, typically a non-permeable film or sheet made of a polyolefin resin or the like.

As a specific example, a cloth such as a nonwoven fabric or a woven fabric similar to the porous substrate is laminated on one surface of a coating material, in this case, a non-breathable film or sheet made of a polyolefin resin or the like. Alternatively, it is also possible to apply a pressure-sensitive adhesive and directly adhere to underwear or skin.

In general, the porous substrate and the coating material are overlapped with each other, and while the contents such as the exothermic composition and the oxygen scavenger are charged during the overlap, the peripheral portion is heat-sealed with the heat-sealing layer. As a result, a heating element, a deoxidizing element, and the like are continuously manufactured.

[0010]

However, when the heat sealing is performed while the contents such as the exothermic composition are charged,
The content adheres to the heat-sealed portion to deteriorate the appearance, and furthermore, foreign matters lower the sealing strength of the heat-sealed portion, all of which pose a quality problem. For this reason, at the moment of loading the content, the shooter of the content moves up and down so that the content does not directly touch the base material, and guides the content so that the content does not touch the heat seal portion. ,
It is configured to return to the top when the loading is completed.

As described above, by moving the shooter of the contents up and down, the heat seal on the horizontal side and the vertical side does not become defective due to impurities. However, when the contents are thrown in, the shooter enters a considerable depth, so that a force is applied to the vertical heat seal portion in a direction in which the heat seal portion is expanded in the horizontal direction and pulled (FIGS. 4A and 4B). I often work.
As a result, a small break may occur at the edge of the heat seal portion on the vertical side on the porous substrate side.

This rupture is a very serious and fatal defect as a product. In the event that the consumer uses the defective product, various problems occur due to leakage of the contents or excessive air flowing in from the broken portion.

That is, if the defective product is, for example, a heating element enclosing a heat-generating composition, if it is used directly on the skin or attached to an undergarment close to the skin, excessive air intensively enters from the broken portion. This causes various adverse effects such as local abnormal heat generation, burns to the skin, and leakage of the heat-generating composition to stain clothes.

Therefore, conventionally, this phenomenon has been called "cut edge of heat seal crack" and has been the most important control point in the manufacturing process.

In order to reliably prevent the "cut edge of the heat seal crack", the inventors have thoroughly pursued the cause thereof and have intensively studied measures for preventing the cause.

Meanwhile, it has been known that it is extremely important to control the air permeability of a porous base material within a predetermined range in controlling the temperature of a heating element (Japanese Patent Publication No. 5-11).
No. 985). The porous base material has a structure of two or more layers including a reinforcing ventilation layer and a porous film, and the porous film is formed by mixing an inorganic fine powder (inorganic filler) such as fine calcium carbonate powder with a polyolefin. After being mixed with a base resin (200 parts by weight or more of an inorganic filler with respect to 100 parts by weight of a resin component), the mixture is molded into a film or sheet, and then stretched to form fine pores (pore diameter) around the inorganic fine powder. Is about several microns or less), and by controlling the size of the micropores (cracks), the air permeability is controlled within a predetermined range.

What can be understood from this process is that, first, since a large amount of the inorganic filler is mixed with the polyolefin resin, the tensile strength is extremely weaker than that of the original resin.

Second, since the direction of this stretching coincides with the direction of advance of the film or sheet of the manufacturing machine, the above-mentioned fine holes (cracks) are generated in the direction of advance (vertical direction). Strength at break of sheet in horizontal direction,
The yield point strength is much weaker and the elongation at break is much higher than in the vertical direction.

For example, Table 1 shows the tensile strength of the porous membranes manufactured by Company A and Company B. For both Company A and Company B, the breaking strength in the horizontal direction is larger than that in the vertical direction. It is also recognized that both the tensile strength and the yield point strength are very weak and easy to elongate.

[0020]

[Table 1]

Third, the porous membrane is used by laminating a cloth such as a nonwoven fabric such as polyamide, polyester or rayon or a woven fabric in order to prevent the weakness of the tensile strength and improve the feel to the skin. Usually, the porous membrane is controlled by a porous film or sheet of several microns or less to control the air permeability within a certain range. To block air permeability,
You can't scatter.

Therefore, when laminating the porous membrane with a cloth such as a nonwoven fabric or a woven fabric, embossing, partial fusion,
Alternatively, partial bonding by gravure printing is performed, but in such a bonding by partial fusion or bonding, the bonding strength between the two is extremely weak and the two can be easily separated.

By the way, Table 2 shows the adhesive strength between the nonwoven fabric and the porous film in the two types of porous substrates of the products of Company A and the product of Company B. It is recognized that it is relatively weak.

[0024]

[Table 2]

In particular, fourth, the shooter descends to the bottom,
The porous membrane is pressed immediately after heat sealing, and since the temperature of the heat sealed portion is close to 100 ° C., the tensile strength is much lower than the measured value at room temperature.

From the first to fourth results, it is recognized that the tensile strength of the porous membrane is low and the reinforcement by the nonwoven fabric is weak.

FIGS. 3 to 5 show a porous substrate 1 (a laminated film of a nonwoven fabric 1a and a porous film 1b) and a coating 2
FIG. 3 is an explanatory view showing a state in which contents 3 such as a heat-generating composition are charged while heat-sealing is performed.

That is, as shown in FIG. 5, for example, the porous substrate 1 and the coating material 2 are fed out from the roll film 10 for the porous substrate 1 and the roll film 20 for the coating material 2, respectively. The content 3 such as the exothermic composition is measured and the porous substrate 1 is passed through a shooter 4 that moves up and down.
And the coating material 2, and is heat-sealed by a die roll 5 in a horizontal and vertical direction so as to seal around the contents 3, cut, and formed into a bag.

FIG. 4 is a partially enlarged view of FIG.
The c surface is a horizontal cross-sectional view of the porous substrate 1, the coating material 2, and the heat seal portion in the vertical direction.
Is a cloth (reinforcement ventilation layer) 1a such as a nonwoven fabric formed of polyamide, polyester, rayon, or the like, and a high-pressure low-density polyethylene (LDPE) or a linear low-density polyethylene.
(LLDPE) or the like, and a laminated film of a porous film 1b formed of a polyolefin resin or the like, while the covering material 2 is composed of a reinforcing layer 2a of a non-breathable polyethylene film and a polyolefin resin similar to the above. And a non-breathable heat-sealing layer (a non-breathable film or sheet) 2b.

In FIG. 4, surface A is inside the porous film 1b of the porous substrate 1, and surface B is inside the heat seal layer 2b of the covering material 2, both of which are viewed from the inside of the bag. . The points regularly arranged on the surface A are emboss points at which the cloth (reinforcing ventilation layer) 1a such as a nonwoven fabric and the porous film 1b are fused.

Now, the shooter 4 descends and faces A and B
When forces in the directions of arrows a and b are applied to the surfaces, respectively, the surface B is sufficiently strong, so that a force is applied particularly to the embossing point of the surface A and the end of the heat seal portion, and the cloth 1a such as a nonwoven fabric is first expanded.

Therefore, for the third reason, the porous film 1b
And the cloth (reinforcing air-permeable layer) 1a such as a non-woven fabric is peeled off, and the porous membrane 1b is very elongated in the horizontal direction and has the smallest yield point strength because of the second reason. Separation from a nonwoven fabric or the like (a reinforcing ventilation layer) 1a is accelerated, and small holes are formed while cracks in the vertical direction are connected, and grow into break lines. These conditions can be sufficiently observed when the tensile test is performed slowly. And the break is sample width 15
After reaching m / m, delamination between the cloth (a reinforcing ventilation layer) 1a such as a nonwoven fabric and the porous film 1b proceeds easily.

By sequentially observing these phenomena, the present inventors found that a cloth (reinforcing ventilation layer) 1a
If the adhesive strength between the film and the porous film 1b is strong, the porous film 1b
As a result, it was found that the cause of the "cut edge of the heat seal crack" must be eliminated.

However, if the bonding area between the cloth 1a such as a non-woven fabric and the porous membrane 1b is increased in a portion other than the heat sealing portion and the bonding strength is increased, the rigidity is reduced and the touch is deteriorated. In this case, the air permeability of the porous substrate 1 fluctuates, and the quality of the heating element and the like extremely deteriorates.

Accordingly, it is possible to reliably prevent the porous membrane 1b from breaking at the heat sealing cracks generated during the heat sealing, and to maintain a strong sealing property. To prevent the occurrence of fouling, etc., only heat-sealed parts of non-woven cloth
(Reinforcing ventilation layer) It was also found that it was necessary to increase the adhesive strength between the porous membrane 1b and the porous membrane 1b.

According to the present invention, when a porous bag for enclosing contents such as a heat-generating composition is heat-sealed with a heat-sealing layer, the heat-sealing layer is formed by a single-site catalyst having a uniform active site. By being formed of polymerized or copolymerized polyethylene, the contents such as the exothermic composition are put into the porous bag body, and the `` heat-seal crease edge cut '' generated when performing heat sealing, that is, A highly safe and highly reliable porous bag that reliably prevents breakage of the seal layer and maintains strong sealing properties, prevents leakage of contents during use, low-temperature burns, and stains on clothes. An object of the present invention is to provide a body, a heating element, a deoxygenating body, a deodorizing body, a ripening body, a drying material, a dehumidifying material, and an odor bag using the same.

[0037]

Means for Solving the Problems The present inventors surely prevent "edge breakage of heat seal cracks" which occurs when performing heat seal, that is, breakage of a seal layer, and maintain strong sealability. In addition, the present inventors have made intensive studies on a safe and highly reliable porous bag body which prevents leakage of contents during use, low-temperature burns, and soiling of clothes.

As a result, when the porous base material and the coating material are overlapped and the peripheral portion thereof is heat-sealed with the heat-sealing layer to produce a porous bag, "edges of heat-sealed cracks" are prevented. In order to secure this requirement, it is essential that the adhesive strength between the cloth such as non-woven fabric and the porous membrane in the heat seal portion on the vertical side be strengthened. Then I got the knowledge.

The inventors of the present invention have conducted intensive studies on heat sealing experiments on the vertical side via various heat sealing layers as described above. When a layer made of polyethylene polymerized or copolymerized is used, at the time of heat sealing, the shooter descends, a force in the direction of the arrow a is applied to the A surface, and peeling of the porous film from the cloth such as a nonwoven fabric occurs. Before the occurrence, the heat sealing layer is quickly melted, and since the molten resin has good thermal conductivity and flowability and good wettability with a cloth such as a nonwoven fabric, the molten resin (melting of the heat sealing layer (Resin) penetrates into the cloth such as a nonwoven fabric from the melting point of the porous membrane to exhibit a broad anchor effect, i.e., the molten resin fits well into the cloth such as the nonwoven fabric, and the bond with the cloth such as the nonwoven fabric is firmly bonded. Result Edge out of the heat seal verge "
Was found to be prevented.

The inventors of the present invention have proposed that a heat-sealing layer made of polyethylene polymerized or copolymerized by a single-site catalyst having uniform active site properties and having the following characteristics performs heat sealing. It has also been found that it is extremely useful in preventing "edge breakage of heat seal cracks" generated at the time.

(1) The heat capacity of the sealant is small, that is, the density is small. (2) Regarding the melting point, there must be a melting region on the lower melting point side from the DSC melting point peak. (3) The melt viscosity is low to some extent, that is, the MFR is high to some extent. (4) The molecular weight distribution is sharp and the molecular weight distribution larger than the average molecular weight is small. (5) The molecular system is compatible with the polyolefin forming the porous film and has a low polarity. (6) It has good wettability with the fibers constituting the fabric such as the porous membrane and the non-woven fabric, and therefore has good thermal conductivity. As a result, the molten resin permeates the fibers of the fabric such as the non-woven fabric and has a broad sense. The anchor effect is exhibited, that is, the molten resin is well adapted to the cloth such as the nonwoven fabric, and the bond with the cloth such as the nonwoven fabric is strong.

In other words, in order to prevent edge breaks from occurring in the heat seal crevices, the heat seal crevices do not cause the separation of the porous film from the cloth such as a non-woven fabric, the porous film does not extend, and the heat seal crevices partially extend in the vertical direction. Cracks do not grow into pits.
In this case, when the heat-sealed portion is cut and the inside is observed, it is easily recognized that the molten resin penetrates well into the cloth such as a non-woven fabric due to the heat-sealed cracks and is hardened and integrated. When the heat-sealed portion is forcibly pulled in the directions of arrows a and b, cohesive failure occurs in the cloth such as a non-woven fabric, and it has been found that delamination between the cloth such as the non-woven fabric and the porous film does not occur. Was.

That is, the porous bag according to the present invention has been completed based on the above findings, and in order to achieve the above object, two or more layers having a reinforcing ventilation layer and a porous membrane are provided. In a porous bag obtained by laminating a porous substrate and one or more coating materials having a heat seal layer and heat-sealing the periphery thereof with the heat seal layer, the heat seal layer has a property of an active point. Is formed of polyethylene polymerized or copolymerized by a uniform single-site catalyst.

The porous substrate used in the present invention includes
It is composed of two or more laminated films or sheets each having a reinforcing ventilation layer and a porous membrane, and has conventionally been a heating element, a deoxygenating substance, a deodorizing substance, a ripening substance, a drying material, a dehumidifying material. And those used for odor bags, respectively.

The reinforcing gas-permeable layer is not particularly limited as long as it is a gas-permeable film or sheet laminated on a porous membrane to improve the strength of the porous membrane.
Specific examples include non-woven fabrics, woven fabrics, knitted or woven fabrics, papers, breathable foam films or sheets, and synthetic resin punching films or sheets formed of natural fibers or artificial fibers.

The artificial fibers include, for example, regenerated fibers such as viscose / rayon, Bemberg, and their soups;
Synthetic fibers such as polyamide, polyester, acrylic, vinylon, Saran, and polypropylene; and semi-synthetic fibers such as acetate, swoof, and chinon.

Various types of porous membranes, synthetic resins,
In particular, high pressure method low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), which have been widely used
Such as a porous film or sheet formed of a polyolefin-based resin such as, specifically, a porous film formed of a polyolefin-based resin and the like conventionally used in the field of a heating element and the like. Films or sheets are mentioned.

In the porous substrate used in the present invention, a two-layer type laminated film or sheet in which the reinforcing gas-permeable layer and the porous film are partially heat-bonded or heat-sealed, and both surfaces of the porous film And a laminated film or sheet of two or more layers, such as a three-layer type laminated film or sheet in which a reinforcing ventilation layer is partially thermally bonded or thermally fused.

This porous substrate must have air permeability (moisture permeability), and its moisture permeability varies greatly depending on the application and is not particularly limited. In general, the moisture permeability is determined by the Lissi method (Lyssy method L80-). 50 g / 4000H type)
m ² · 24 hr or more as long as the content does not leak during use. In particular, the moisture permeability is determined by the Lissi method (Lys method).
50-10,000 g by sy method L80-4000H type)
/ M ² · 24 hr.

If the water vapor permeability is less than 50 g / m ² · 24 hr, the calorific value, deoxygenation / deodorization effect, ripening / dehumidification effect or fragrance evaporation effect will be reduced, and the desired effect according to the application cannot be obtained. It is not preferable because there is a fear. Meanwhile, 1
If it exceeds 000 g / m ² · 24 hr, the exothermic temperature rises, causing safety problems, shortening the exothermic time, shortening the deoxygenation / deodorization effect, ripening / dehumidifying effect, or the fragrance evaporation effect. As a result, it is not preferable because the effectiveness over a long period of time cannot be expected or contents may leak. Therefore, the moisture permeability of the porous substrate is 100 to 7,500.
It is particularly preferable that the amount is within the range of g / m ² · 24 hr, since a safe and sufficient effect can be obtained for a long time.

By the way, the Lissi method (Lyssy method) is a method based on industrial plans in various countries around the world.
In SZ0208, a temperature of 40 ° C. and a relative humidity difference of 90% R
H, it is set to 10
A measurement sample is inserted into the boundary between the lower chamber in a state of 0% relative humidity and the upper chamber in which a highly sensitive humidity sensor is installed, and the relative humidity of the upper chamber with the humidity sensor is adjusted to 10% RH (100% -90). %), And about ± 1% width (△ RH)
That is, the time required for the humidity to increase from about 9% to about 11% (several seconds) is measured and compared with the result of calibration performed under the same conditions using a standard sample whose transmittance is known in advance, thereby transmitting the light. This is a method to determine the degree.

In the present invention, the porous base material is laminated with one or more coating materials having a heat seal layer, and the periphery thereof is heat-sealed with the heat seal layer. In the bag, the heat seal layer is formed of polyethylene which is polymerized or copolymerized by a single-site catalyst having a uniform property of active points,
Features.

That is, in the present invention, as the coating material,
One-layer type consisting only of a heat seal layer formed of polyethylene polymerized or copolymerized by a single-site catalyst having a uniform active site property, or this kind,
A laminated type including two or more layers including a heat seal layer and a reinforcing layer may be used.

That is, the present invention is characterized in that the heat seal layer is formed of polyethylene polymerized or copolymerized with a single-site catalyst having a uniform active site property. However, in particular, a metallocene catalyst, and the heat-sealing layer is formed of polyethylene polymerized or copolymerized by the metallocene catalyst, or the heat-sealing layer is formed of polyethylene polymerized by the metallocene catalyst or copolymerized with α-olefin. It is preferable because a polyethylene heat seal layer having the above-mentioned characteristics (1) to (6) can be obtained, and "cut edges of heat seal cracks" generated at the time of heat sealing can be prevented.

In this kind, a polyethylene heat seal layer polymerized or copolymerized by a single-site catalyst, wherein the polyethylene has an MFR (melt flow rate) of 0.5 g / 10 min or more and less than 20 g / 10 min. If the MFR is too small, such as less than 0.5 g / 10 minutes, the melt viscosity is too large and the permeability to the reinforcing ventilation layer such as a nonwoven fabric is poor, and the desired adhesive strength cannot be obtained, and heat sealing is performed. In this case, there is a possibility that "edge breakage of heat seal cracks" may occur, but if it exceeds 20 g / 10 minutes, the strength is weakened, and neither is desirable. Therefore, especially MFR (melt flow rate) of polyethylene
Is more preferably 3 g / 10 min or more and less than 15 g / 10 min.

[0056] In the present invention, the density of the polymerization or copolymerization polyethylene by metallocene catalyst 0.95 g / cm ³ or less, in particular 0.93 g / cm ³ or less of those, even from 0.88 to 0. desirably in the range of 93 g / cm ^3, for reinforcement during heat sealing density weakens the adhesion strength between 0.95 g / cm ³ greater than the heat seal strength is weak reinforcing breathable layer and a porous membrane This is not desirable because the air-permeable layer and the porous membrane may be separated from each other, and “cut edges of heat seal cracks” may occur during heat sealing.

Further, in the present invention, the D of polyethylene polymerized or copolymerized with a single-site catalyst is used.
Preferably, the melting point of the SC is 125 ° C. or less,
When the melting point exceeds 125 ° C., the heat sealing strength is weak, and the bonding strength between the reinforcing gas-permeable layer and the porous membrane is weak. As a result, the heat-sealing peels off the reinforcing gas-permeable layer and the porous film,
This is not desirable because there is a possibility that "edges of heat seal cracks" may occur during heat sealing.

From the above, when using a heat seal layer made of polyethylene polymerized or copolymerized with a single-site catalyst having a uniform active site property, the MFR (melt flow rate) of this polyethylene is used. Is 20 g / 10 min at 0.5 g / 10 min or more
Min, preferably MFR (melt flow rate) of the polyethylene is 3 g / 10 min or more and less than 15 g / 10 min, and the density of the polyethylene is 0.95 g / cm
³ or less, especially 0.93 g / cm ³ or less, and more preferably 0.3 g / cm ³ or less.
It is desirable that the melting point of the polyethylene is in the range of 88 to 0.93 g / cm ³ , and the DSC melting point of the polyethylene is 125 ° C. or less. When a porous substrate made of a film is heat-sealed, the three members are fused together in a heat-sealed portion, and as a result, EVA, EM
Compared to the case where MA, LOPE, or the like was used for the heat seal layer, it was recognized that the heat seal strength was high, the hot tack property was good, and "the edge cut of the heat seal crack" did not occur at all.

The metallocene catalyst is a catalyst which was discovered as a highly active catalyst for polyethylene by Professor Kaminski of the University of Hamburg in 1980. And a promoter.

In the coating material used in the present invention, a laminated film or sheet of two or more layers in which the heat sealing layer and the reinforcing layer are partially or entirely thermally bonded or thermally fused is used. The reinforcing layer is not particularly limited as long as it is a film-shaped or sheet-shaped reinforcing layer that is laminated on a heat-sealing layer and improves the strength of the heat-sealing layer. In addition to the above-mentioned reinforcing air-permeable layer, a non-air-permeable film or sheet may be used.

In the present invention, the thicknesses of the porous substrate and the coating material vary greatly depending on the application and are not particularly limited, but have a strength that does not cause damage during use or handling. Cost. Specifically, for example, it is desirable to set the range to 10 to 5000 μm.

When the thickness of the porous substrate and the coating material is less than 10 μm, the required mechanical strength cannot be obtained, and
It is preferable because there is a possibility that it may be difficult to make the film thickness uniform. On the other hand, the thickness of the porous substrate and the coating material is 5000 μm.
If it exceeds m, it is not preferable because the flexibility of the foam, such as sponge, is lowered, and the thickness of the entire porous bag becomes too thick, resulting in poor handling and usability.

Therefore, the thickness of the porous substrate and the coating material is particularly preferably in the range of 12 to 2500 μm, more preferably 15 to 1 μm.
When the thickness is in the range of 000 μm, desired mechanical strength can be obtained, and required flexibility can be obtained.

The porous bag according to the present invention has the above-mentioned structure, and is manufactured by heat-sealing a porous bag in which contents such as a heat-generating composition are sealed with a heat-sealing layer. Since the layer is formed of polyethylene polymerized or copolymerized by a single-site catalyst having a uniform active site property, the contents such as the exothermic composition are charged into the porous bag and heat sealing is performed. In addition, it reliably prevents the breakage of the edge of the heat seal cracks, that is, the breakage of the seal layer, and maintains a strong seal, preventing leakage of contents during use, low-temperature burns, and stains on clothes. A porous bag that can be obtained is obtained by a method similar to the conventional method, and a heating element, a deoxygenator, a deodorant, a ripening body, a drying material, a dehumidifying material, and an odor bag using the porous bag. Is extremely cheap In it and very high for reliability.

That is, in order to achieve the above object, a porous bag according to the present invention is used as a heating element according to the present invention, and the porous bag reacts with oxygen in the air to generate heat. The exothermic composition is sealed.

In this case, the exothermic composition used in the present invention is composed of a substance that generates heat by reacting with oxygen in the air, and specific examples thereof include those used for disposable warmers and warming shipping agents. Conventionally known materials mainly containing metal powder, particularly iron powder, which is a heat generating substance, and the heating element according to the present invention are manufactured by the same apparatus and method as in the prior art.

Further, in order to achieve the above object, a porous bag according to the present invention is used as the oxygen scavenger according to the present invention, and the oxygen scavenger reacting with oxygen in the air is provided in the porous bag. The agent is enclosed.

The oxygen scavenger used in the present invention is composed of a composition mainly composed of a reducing substance which reacts with oxygen in the air. Specifically, for example, the oxygen scavenger is placed in a packaging container for various foods. And a reducing substance that absorbs oxygen in the packaging container. Specifically, for example, a metal powder that is a reducing substance, for example, iron powder, or a metal salt, for example, ferrous chloride, or L -A reducing organic compound such as ascorbic acid, and a conventionally known compound mainly containing a mixture of these reducing substances. Manufactured by

Further, as the deodorant according to the present invention, in order to achieve the above object, a porous bag according to the present invention is used, and a deodorant for adsorbing malodorous substances is enclosed in the porous bag. It is characterized by having.

Examples of the deodorant used in the present invention include substances that adsorb malodorous substances in the air and oxidize malodorous substances in the air to make them deodorant.
For example, in addition to activated carbon, zeolites, and ceramics that exhibit a deodorizing effect, conventionally known substances such as substances that oxidize and deodorize malodorous substances such as silver oxide and silver peroxide are also included in the present invention. Such a deodorant is manufactured by the same apparatus and method as in the related art.

As the ripening body according to the present invention, in order to achieve the above object, a porous bag according to the present invention is used, and ethylene gas reacts with oxygen in the air in the porous bag. It is characterized in that the ripening composition generated is enclosed.

The ripening composition used in the present invention includes:
One that reacts with oxygen in the air to generate ethylene gas is mentioned. Specifically, for example, Japanese Patent Publication No. 6-3
No. 9413 and Japanese Unexamined Patent Application Publication No. 8-103212 include ripening compositions, and the ripening body according to the present invention is manufactured by the same apparatus and method as in the related art.

As the drying agent according to the present invention, the porous bag according to the present invention is used to achieve the above object.
The porous bag body is characterized in that a desiccant that absorbs moisture is sealed therein.

The desiccant used in the present invention is not particularly limited as long as it is used for preventing food from becoming damp or for drying food. Specific examples thereof include silica gel and quicklime. And conventionally known substances such as deliquescent substances such as and magnesium chloride, and
The desiccant according to the present invention is manufactured by the same apparatus and method as in the related art.

Further, as the dehumidifying material according to the present invention, in order to achieve the above object, the porous bag according to the present invention is used, and a moisture absorbing agent for absorbing moisture in the air is provided in the porous bag. It is characterized by being enclosed.

The dehumidifying agent used in the present invention is not particularly limited as long as it is placed inside furniture such as a closet, a closet, a shoe box, etc. to remove moisture inside these. Examples of the dehumidifying agent include conventionally known substances such as a deliquescent substance such as calcium chloride, and the dehumidifying material according to the present invention is manufactured by the same apparatus and method as in the related art.

As the odor bag according to the present invention, in order to achieve the above object, the porous bag according to the present invention is used, and the porous bag is filled with a transpirable fragrance. And

The fragrance used in the present invention is not particularly limited as long as it evaporates and emits an aroma. Specifically, for example, natural fragrances such as vegetable fragrances and animal fragrances, and terpene-based fragrances Synthetic fragrances, synthetic fragrances such as aromatic synthetic fragrances or aliphatic synthetic fragrances, such as conventionally known sandalwood, musk, and chara, and the like, and the odor bag according to the present invention is a device similar to the conventional one. And manufactured by methods.

[0079]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 As shown in FIGS. 1 and 5, as the porous substrate 1, a nonwoven fabric (reinforcing ventilation layer) 1a made of nylon spunbond long fiber having a basis weight of 40 g and a polyethylene made of polyethylene having a thickness of 30 μm were used. Of the nonwoven fabric (reinforcement ventilation layer) 1a and embossing at intervals of 1 mm from the nonwoven fabric (reinforcement ventilation layer) 1a. A laminated film obtained by thermal fusion was used.

On the other hand, as shown in FIG. 1 and FIG. 5, the coating material 2 has a thickness of 20 μm produced by a metallocene catalyst.
μm polyethylene copolymer heat seal layer (MF
R11g / 10 min, density 0.905 g / cm ^3, DSC
A laminated film was used in which 2b (melting point: 102 ° C.) and a reinforcing layer 2a formed of a linear low-density polyethylene film having a thickness of 60 μm and being impermeable to air were used.

As shown in FIGS. 1 and 5, when the roll film 10 for the porous base material 1 and the roll film 20 for the coating material 2 are fed out, respectively, at a speed of 4.0 m / min. The temperature of the heat seal portion of the die rolls 5 and 5 on the porous substrate 1 side is 141 ± 0.5 ° C., and the temperature of the heat seal portion of the die roll 5 on the coating material 2 side is 160 ± 0.5 ° C,
6.5kg / c pressure between die roll and heat seal
At m ² , the surface of the porous film 1 b and the surface of the heat seal layer 2 b were overlapped, and the film was run in the vertical direction to heat seal H around the outer periphery of the heat generating composition 3 a.

In this case, the shape of the heat seal portions of the die rolls 5 and 5 is 13.5 cm in the vertical direction and 9.5 cm in the horizontal direction of the bag making, and the sealing width of one bag is 6 mm in the vertical direction and 8 mm in the horizontal direction. As shown in FIG. 5, a shooter 4 that moves up and down is provided above the two die rolls 5, and when the shooter 4 reaches the lower part, 50 g of the exothermic composition 3 a is supplied from the shooter 4. Being
A bag was produced while performing heat sealing to produce a heating element.

In order to measure the sealing strength on the long side (13.5 cm) side (vertical side) of this bag, a sample of 15 m / m width was taken, and this was taken at room temperature at a tensile speed of 500 mm / min. A T-peel test between the base material 1 and the coating material 2 was performed. Table 3 shows the test results. In FIG. 1, reference numeral 6 denotes an adhesive layer.

[0085]

[Table 3]

Example 2 As shown in FIG. 2, the heat seal layer 2b was replaced with the heat seal layer 2b of Example 1 with an MFR of 4 g / 10 minutes and a density of 0.91.
5. Using a heat seal layer (thickness: 20 μm) 2b made of an ethylene-α-olefin copolymer having physical properties of DSC melting point of 108 ° C. and produced by a metallocene catalyst,
Further, as the coating material 2, a reinforcing layer 2 made of a non-breathable linear low-density polyethylene film having a thickness of 60 μm.
A bag was produced in the same manner as in Example 1 except that a layer obtained by laminating the heat seal layer 2b and the reinforcing layer 2a made of nylon spunbond filament having a basis weight of 40 g via c was used to produce a heating element. .

Further, similarly to the first embodiment, the long side (1
3.5 cm) to measure the seal strength on the [vertical side] side
Take a sample of 5m / m width and put it at room temperature under 500
T between the porous substrate 1 and the coating material 2 at a pulling speed of mm / min.
A peel test was performed. Table 3 shows the test results.

Example 3 As the heat seal layer 2b, instead of the heat seal layer 2b,
MFR 1.5 g / 10 min, density 0.92, DSC melting point 1
A bag was made in the same manner as in Example 2 except that a heat seal layer (thickness: 20 μm) 2b made of an ethylene / α / olefin copolymer having physical properties of 15 ° C. and produced by a metallocene catalyst was used. The heating element 11 shown in FIG. 2 was manufactured.

Further, similarly to the first embodiment, the long side (1
3.5 cm) to measure the seal strength on the [vertical side] side
Take a sample of 5m / m width and put it at room temperature under 500
T between the porous substrate 1 and the coating material 2 at a pulling speed of mm / min.
A peel test was performed. Table 3 shows the test results.

Example 4 As the heat seal layer 2b, instead of the heat seal layer 2b,
MFR 2 g / 10 min, density 0.925, DSC melting point 12
A bag was formed in the same manner as in Example 2 except that a heat seal layer (thickness: 20 μm) 2b made of an ethylene / α / olefin copolymer having physical properties of 0 ° C. and produced by a metallocene catalyst was used, The heating element 11 shown in FIG. 2 was manufactured.

Further, similarly to the first embodiment, the long side (1
3.5 cm) to measure the seal strength on the [vertical side] side
Take a sample of 5m / m width and put it at room temperature under 500
T between the porous substrate 1 and the coating material 2 at a pulling speed of mm / min.
A peel test was performed. Table 3 shows the test results.

By the way, when the samples of Examples 1 to 4 were peeled off and the heat-sealed portions were visually observed, all of the heat-sealed portions showed cohesive failure in the non-woven fabric, It was recognized that 1 and the covering material 2 were integrally joined.

Comparative Example As the heat seal layer 2b, instead of the heat seal layer 2b of the first embodiment,
A bag was made in the same manner as in Example 1 except that a heat seal layer (thickness: 29 μm) made of ethylene-methyl methacrylate, which is known to have the best heat sealability, was used as the conventional heat seal layer 2b. Then, the heating element 11 was manufactured.

Further, similarly to the first embodiment, the long side (1
3.5 cm) to measure the seal strength on the [vertical side] side
Take a sample of 5m / m width and put it at room temperature under 500
T between the porous substrate 1 and the coating material 2 at a pulling speed of mm / min.
A peel test was performed. Table 3 shows the test results.

By the way, when the sample of the comparative example was peeled off and the heat-sealed portion was observed with the naked eye, delamination was shown between the porous film 1b and the heat-sealing layer 2b. It was recognized that No. 1 and the coating material 2 were not integrally joined.

By the way, in Examples 1 to 4, when the heating element 11 was manufactured, the running speed was set at 4.0 m / min.
After raising the speed to 2 m / min and operating for 40 minutes, all the bag-made products were subjected to the edge cut test and the abnormal inspection of the seal width. No abnormalities such as decrease were observed at all.

On the other hand, in the comparative example, the running speed was increased from 4.0 m / min to 5.2 m / min and the bag-making product was operated for 40 minutes in the same manner as in each of the examples, and all the edge cut tests and seals were performed. Inspection of the width abnormalities revealed that 5% of the edges of the seal were cut, and that the width of the seal was reduced by 11%.

[0098]

The porous bag according to the present invention has the above-mentioned structure, and the heat sealing layer of the porous bag for enclosing the contents such as the exothermic composition is a single-site having uniform active site properties. Since it is formed of polyethylene polymerized or copolymerized by the catalyst, the contents such as the exothermic composition are put into the porous bag body, and the `` cut edge of the heat seal wrinkle '' generated when heat sealing is performed, In other words, breakage and tearing of the seal layer and generation of through holes can be reliably prevented, strong sealing performance is maintained, yield is significantly improved, leakage of contents during use, low-temperature burn, and soiling of clothes. As a result, it is possible to prevent the occurrence of the like, and as a result, it has a highly safe and highly reliable effect.

As the heating element according to the present invention, the porous bag according to the present invention is used, and a heat-generating composition which reacts with oxygen in the air to generate heat is enclosed in the porous bag. The composition is put into a porous bag body, and the "cut edge of the heat seal crack" generated when performing heat sealing, that is, it is possible to reliably prevent the breakage and tearing of the seal layer and the generation of through holes, and to strongly In addition to maintaining excellent sealing properties, the yield is remarkably improved, and leakage of the heat-generating composition during use, low-temperature burns, and soiling of clothes can be prevented. As a result, the commercial value can be improved, and safety and reliability can be improved. The effect is extremely high.

Further, as the oxygen scavenger according to the present invention, the porous bag according to the present invention is used, and an oxygen scavenger reacting with oxygen in the air is sealed in the porous bag. The oxygen scavenger is charged into the porous bag body, and the `` cut edge of the heat seal cracks '' that occurs when heat sealing is performed, that is, the breakage and tearing of the seal layer and the occurrence of through holes can be reliably prevented, Maintains strong sealing properties, significantly improves yield, prevents oxygen scavengers from leaking during use, and prevents the occurrence of soiling of foods, etc. And it has an extremely high effect of reliability.

Further, as the deodorant according to the present invention, the porous bag according to the present invention is used, and a deodorant that adsorbs malodorous substances is sealed in the porous bag, so that the deodorant is porous. `` Heat-seal edge breaks '' that occur when heat-sealed after being put into a plastic bag, that is, it can reliably prevent the breakage or tearing of the seal layer and the occurrence of through holes, and at the same time, provide strong sealing properties. Maintain and significantly improve the yield, and also prevent leakage of the deodorant during use and the occurrence of fouling inside the refrigerator etc. As a result, the commercial value is improved, and the safety and reliability are extremely high. It has.

As the ripening body according to the present invention, the porous bag according to the present invention is used, and a ripening composition which reacts with oxygen in the air to generate ethylene gas is enclosed in the porous bag. Since the ripening composition is put into the porous bag body and heat sealing is performed, the "cut edge of the heat sealing crack", that is, the breakage and tearing of the seal layer and the generation of through holes are ensured. In addition to maintaining strong sealing properties, the yield is remarkably improved, and leakage of the ripening composition during use or the occurrence of soiling of fruits and vegetables can be prevented, thereby improving the commercial value. It is safe and highly reliable.

Further, the porous bag according to the present invention is used as the desiccant according to the present invention, and a desiccant that absorbs moisture is sealed in the porous bag. It is possible to reliably prevent "cut edges of heat seal cracks" that occur when heat sealing is performed by putting it into the bag body, that is, breakage and tearing of the seal layer and generation of through holes, and maintain strong sealing performance In addition, the yield is remarkably improved, and the leakage of the desiccant during use and the occurrence of contamination of foods can be prevented. As a result, the commercial value is improved, and a safe and highly reliable effect is obtained. is there.

Further, as the dehumidifying material according to the present invention, the porous bag according to the present invention is used, and a moisture absorbing agent for absorbing the moisture in the air is sealed in the porous bag. Into the porous bag and heat-sealing, the "cut edges of the heat-seal cracks", that is, the breakage and tearing of the seal layer and the occurrence of through-holes can be reliably prevented, and a strong seal is provided. In addition, the yield can be significantly improved, and the leakage of the moisture absorbent during use and the occurrence of stains inside furniture such as a closet, a closet, a clog box, etc. can be prevented, thereby improving the product value. It is safe and highly reliable.

As the odor bag according to the present invention, the porous bag according to the present invention is used, and since the translucent fragrance is sealed in the porous bag, the fragrance is put into the porous bag. In addition, it is possible to reliably prevent `` cut edges of heat seal cracks '' that occur when performing heat sealing, that is, breakage and tearing of the seal layer and generation of through holes, maintain strong sealing performance, and increase yield. As a result, it can significantly prevent leakage of perfume during use and the occurrence of stains on clothes.
It has the effect of improving the value of the product and of being extremely safe and reliable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heating element of the present invention obtained by using a porous bag according to the present invention.

FIG. 2 is a cross-sectional view of a heating element according to another embodiment.

FIG. 3 is an explanatory view showing a manufacturing process of the heating element according to the present invention.

FIG. 4 is an explanatory diagram for explaining the cause of the occurrence of “cut edge of heat seal crack” when the content is put into a porous bag and heat sealing is performed.

FIG. 5 is a schematic view showing a manufacturing process of the heating element according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Porous base material 1a Nonwoven fabric (reinforcement ventilation layer) 1b Porous film 2 Coating material 2a Reinforcement layer 2b Heat seal layer 2c Reinforcement layer 3 Contents 3a Heat generation composition 4 Shooter 5 Die roll 6 Adhesive layer 10 Porous base material Roll film for coating 20 Roll film for coating material H Heat sealing

Claims (16)

[Claims] 1. A laminate comprising at least two porous substrates each having a reinforcing air-permeable layer and a porous membrane and at least one coating material having a heat-sealing layer. A heat-sealed porous bag, wherein the heat-sealing layer is formed of polyethylene polymerized or copolymerized by a single-site catalyst having uniform active site properties. 2. The porous bag according to claim 1, wherein the reinforcing air-permeable layer is a woven fabric, a nonwoven fabric, a knitted or woven fabric, a paper, or a punched film sheet. 3. The porous bag according to claim 1, wherein the single-site catalyst is a metalsen catalyst, and the heat seal layer is formed of polyethylene polymerized or copolymerized by the metallocene catalyst. 4. The porous bag according to claim 1, wherein the heat seal layer is formed of polyethylene polymerized by a metallocene catalyst or copolymerized with an α-olefin. 5. The porous bag according to claim 1, wherein the coating material comprises at least two layers each having a heat sealing layer and a reinforcing layer. 6. The porous bag according to claim 5, wherein the reinforcing layer is a cloth such as a woven fabric, a nonwoven fabric, a knitted fabric or a woven fabric, a paper, a punched film sheet or a non-breathable film or sheet. 7. The method according to claim 1, wherein the MFR (melt flow rate) of the polyethylene polymerized or copolymerized by the single-site catalyst is 0.5 g / 10 min or more and less than 20 g / 10 min. The porous bag according to the above. 8. The density of polyethylene polymerized or copolymerized by a single-site catalyst is 0.95 g / cm ^3.
The porous bag according to any one of claims 1 to 7, wherein: 9. The porous bag according to claim 1, wherein the DSC of the polyethylene polymerized or copolymerized by the single-site catalyst is 125 ° C. or less. 10. A heating element characterized in that a heating composition which generates heat by reacting with oxygen in the air is enclosed in the porous bag according to any one of claims 1 to 9. . 11. An oxygen absorber, wherein an oxygen absorber that reacts with oxygen in the air is sealed in the porous bag according to any one of claims 1 to 9. 12. A deodorizing body characterized in that a deodorizing agent for adsorbing malodorous substances is enclosed in the porous bag body according to any one of claims 1 to 9. 13. A ripening composition which reacts with oxygen in the air to generate ethylene gas is sealed in the porous bag according to any one of claims 1 to 9. Ripening body. 14. A desiccant, characterized in that a desiccant that absorbs moisture is enclosed in the porous bag according to any one of claims 1 to 9. 15. A dehumidifying material characterized in that a moisture absorbent for absorbing moisture in the air is sealed in the porous bag body according to any one of claims 1 to 9. 16. An odor bag, wherein a transpirable fragrance is sealed in the porous bag body according to any one of claims 1 to 9.