JPH0889527A - Bag for disposable body warmer - Google Patents

Abstract

PURPOSE: To provide a bag for disposable body warmers having excellent mechanical characteristics, dimensional stability, moisture absorbability, soft touch to the skin and flexibility. CONSTITUTION: This bag for disposable body warmers has two sheets of sheet parts 2a, 2b formed by two-folding a sheet 1 consisting of nonwoven fabric of cotton fibers and is formed by interposing a band-shaped piece 4 of a nonwoven web of synthetic fibers consisting of a thermoplastic polymer between two sheets of the sheet parts 2a, 2b on the remaining side exclusive of the connecting parts 3 along the folding line of two sheets of the sheet parts 2a, 2b. The parts interposed with this band-shaped piece 4 are joined between two sheets of the sheet parts 2a, 2a in the state that the cotton fibers existing at least at the boundary surface of both nonwoven webs are embedded in the fused parts of the synthetic fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable body warmer bag having excellent mechanical properties, dimensional stability, hygroscopicity, soft feel and flexibility.

[0002]

2. Description of the Related Art Conventionally, as a material for a disposable body warmer bag, a nonwoven fabric made of synthetic fibers has been used, and generally, a spunbonded nonwoven fabric made of synthetic fibers has been widely used. However, the spunbonded nonwoven fabric has a problem in that it lacks flexibility because it is subjected to heat pressure contact in the manufacturing process of the nonwoven fabric.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve the above problems and provides a bag for disposable body warmers having excellent mechanical properties, dimensional stability, hygroscopicity, soft touch, and flexibility. The purpose is.

[0004]

In order to solve this problem, a bag for disposable body warmers of the present invention comprises two sheet portions formed by folding two sheets of a cotton fiber non-woven web, A synthetic fiber non-woven web strip made of a thermoplastic synthetic polymer is interposed between the two sheet parts on the remaining side of the two sheet parts excluding the connection part along the folding curve. A portion having a strip-shaped piece made of is bonded between two sheet portions in a state where the cotton fibers located at least at the boundary surface of the both non-woven webs are embedded in the fusion portion of the synthetic fiber. It is a summary. The bag for disposable body warmer of the present invention is characterized in that the cotton fiber non-woven web has a basis weight of 60 to 200 g / m ² and a bulk density of 0.3 to 0.7 g / cc.

Next, the bag for disposable body warmers of the present invention will be described in detail with reference to the drawings. FIG. 1 is a development view of the bag for disposable body warmers of the present invention, and FIG. 2 is a perspective view showing a state immediately before completion of the bag for disposable body warmers of the present invention.

In the figure, reference numeral 1 denotes a sheet made of a non-woven cotton fiber web, which has a rectangular plane shape in a developed state and is folded in two to form two sheet portions 2a, 2
b is formed. A strip 4 made of a synthetic fiber non-woven web is interposed between the two sheet portions 2a and 2b on the remaining three sides except the connection portion 3 along the folding curve of the two sheet portions 2a and 2b. The portion where the strip 4 is interposed,
Two sheet portions 2 with the cotton fibers located at least at the boundary surface of both non-woven webs being embedded in the fusion portion of the synthetic fibers.
In order to join between a and 2b, bonding processing is performed by ultrasonic welder processing. Reference numeral 5 is an adhesive portion obtained by the ultrasonic welder treatment.

A first characteristic of the bag for disposable body warmers of the present invention is that a non-woven web having a three-dimensional entanglement composed of cotton is used. In the present invention, the three-dimensional entanglement means that the fibers forming the non-woven web are entangled not only in the transverse direction but also in the thickness direction, and have a densely integrated structure. means. In addition, the densely integrated structure means that the constituent fibers are mainly entangled with each other and have a bulk density higher than that of the carded nonwoven web.

In the present invention, a spunlace method can be adopted as a method for producing a non-woven web having three-dimensional entanglement. This process will be described in detail. An injection hole having a hole diameter of 0.05 to 1.5 mm is formed with an injection hole interval of 0.5 to 5 mm.
A high-pressure liquid stream ejected in a columnar shape at a high pressure from a plurality of orifice heads arranged in one row or a plurality of rows in mm is collided with a non-woven web placed on a porous support plate to form a non-woven web. The fibers are densely entangled with each other to be integrated. As the fluid, water at room temperature or hot water can be used. When the high-pressure liquid flow collides with the nonwoven web, the orifice head having the injection holes is formed in a direction perpendicular to the traveling direction of the nonwoven web placed on the porous support plate. It is advisable to oscillate the orifice head at the same intervals as the intervals of the injection holes so that the high-pressure liquid flow is ejected and collide uniformly.

When the high pressure liquid flow is jetted, the porous support plate on which the non-woven web is placed is made of metal as long as the high pressure liquid flow can pass through the non-woven web on the support plate. , A polyester, or any other material, and generally a net having a mesh such as metal or polyester is used.

The mesh size of the net used for the confounding treatment is in the range of 30 to 150 lines / 25 mm, and more preferably in the range of 50 to 100 lines / 25 mm.
If it is less than 30 pieces / 25 mm, the non-woven web is perforated and becomes a perforated non-woven web, and when used as a bag for a disposable body warmer, the temperature of the body warmer component inside is directly transmitted from the perforated part, which is preferable. Absent. Also, 150/2
If it exceeds 5 mm, the amount of energy required for the high-pressure liquid stream to pass through the laminated nonwoven web and the net becomes large,
Not preferable in terms of production cost.

The entanglement treatment with the high-pressure liquid flow may be performed at least twice. That is, in the first confounding treatment with the high-pressure liquid flow, the water pressure was 40 kg / cm ²
Pre-entangle the nonwoven web with a high pressure liquid flow below G. The water pressure for this first entangling treatment is 40 kg.
/ Cm ² G or more, the non-woven web is disturbed due to the accompanying airflow generated by the high-pressure liquid flow, which is not preferable in terms of unit weight unevenness and maintaining the quality of the non-woven web. The non-woven web preliminarily entangled was subsequently subjected to the entanglement treatment after the second time by a high-pressure liquid flow having a water pressure of 50 kg / cm ² G or more, and the constituent fibers were three-dimensionally entangled to be densely integrated. It becomes a non-woven web.

Further, the non-woven web obtained by the above method is further reversed by the unit weight of the non-woven web, and the third interlacing process is performed by the hydroentanglement process applied in the second time. Both can be non-woven webs that are densely entangled.

The excess moisture of the non-woven web obtained as described above is removed by a known moisture removing device such as mangle, and further subjected to a drying treatment by a suction band type hot air circulating dryer to three-dimensionally entangle. To obtain a nonwoven web having

The non-woven web having a three-dimensional entanglement by the above method is continuously introduced into a pressure roll composed of two rolls and subjected to a pressure treatment, so that the bulk density is 0.3 to 0.7 g. / Cc non-woven web. The two rolls to be subjected to this pressure treatment may be any of a metal roll, a rubber roll, and a cotton roll, but a metal roll is preferable for forming a particularly high bulk density. When using the metal roll, It is more preferable to use a material that can be heated.

The bulk density of the non-woven cotton fiber web used for the disposable body warmer bag of the present invention has a bulk density of 0.3 to 0.7 g / c.
It is preferably in the range of c. This bulk density is 0.3g
If it is less than / cc, the non-woven web that has been subjected to the high-pressure liquid flow treatment will be one in which an opening portion that substantially penetrates the non-woven web is formed according to the pore shape of the porous support plate. The openings are left on the nonwoven web, and as a result, the heating element inside the disposable body warmer bag leaks out, which is not preferable. On the other hand, when the bulk density exceeds 0.7 g / cc, the effect of preventing the heat generating element from leaking to the outside is sufficient, but the texture of the non-woven web becomes paper-like and hard, which is not preferable.

What is essential in this pressurizing step is that the linear pressure of the pressurizing rolls can be changed within the range of 20 to 200 kg / cm, and the gap between the pressurizing rolls (hereinafter referred to as clearance) can be changed. . That is, the bulk density required for the non-woven web can be easily obtained by appropriately selecting the linear pressure and the clearance of the pressure roll according to the basis weight of the non-woven web. This linear pressure is 20
Below kg / cm, when the basis weight of the nonwoven web is high,
The target bulk density may not be obtained, and
If it exceeds kg / cm, the bulk density can be sufficiently achieved, but the bulk density of the obtained non-woven web exceeds 0.7 g / cc, the feel of the non-woven web becomes paper-like, and the texture is impaired, which is not preferable.

The nonwoven web in the present invention uses cotton as a constituent fiber, and its basis weight is 60 to 20.
It is preferably 0 g / m ² . Basis weight is 60 g / m ²
If it is less than this, the heat of the body warmer that has reached a high temperature is directly transmitted to the skin, and the heat is felt, which is not preferable. On the other hand, the basis weight is 200g
If it exceeds / m ² , the heat of the body warmer is blocked by the nonwoven web, which is not preferable. More preferably 80-150 g / m
A range of ² is good.

The effect of preventing leakage of the heating element inside the disposable body warmer bag of the present invention is measured by the following method. That is, from the non-woven web having three-dimensional entanglement obtained by the above method, 5 samples having a size of 20 cm × 20 cm were prepared and measured by the following method, and the obtained measured value was 85% or more. The non-woven web has a good effect of preventing leakage of a heating element. The measurement sample is provided in a wind tunnel having a diameter of 120 mm, and an average particle diameter of latex of 5 microns as dust is supplied to the wind tunnel.
The dust concentration is supplied at a flow rate of 15 mg / m ³ and 5 m / min, the dust concentration before and after the measurement sample is measured, and the leakage prevention effect of the heating element is determined by the amount of passing dust.

In the present invention, by setting the collection efficiency of dust having an average particle size of 5 microns to 85% or more, the effect of preventing the heating element having an average particle size of 10 microns or more used in a disposable body warmer from the outside of the bag is obtained. It is what is done.

As the cotton constituting the non-woven web,
Comb yarn and bleached cotton are used, but their fineness is 1.0-
It is advisable to employ a fiber having a denier of 2.5 and a fiber length of about 10 to 30 mm.

The cotton constituting the non-woven web may be, in addition to the above-mentioned combed yarn and bleached cotton, a yarn made of cotton or a fluff obtained from a woven or knitted fabric. The fluff is simply bleached, exposed to fluorescence, or dyed.

The anti-pulling machine which can be effectively used in the present invention includes a rag machine, a knot breaker, a garnet machine and a slicing machine. The type and combination of anti-fluffing machines used depend on the shape of the fabric to be fluffed, the thickness of the threads that make up it, and the strength of the twist, but several identical anti-fluffing machines can be connected in series or two types can be used. It is effective to use a combination of the above anti-fluffing machines. Here, the defibration rate by the anti-pulling machine is 3
The range of 0 to 95% is preferable. When the defibration rate is less than 30%, the liquid flow does not sufficiently penetrate the web when the web is treated with the high-pressure liquid flow, and when the defibration rate exceeds 95%, sufficient surface abrasion strength cannot be obtained. The defibration rate is obtained by the formula shown below.

Disentanglement ratio (%) = (weight of fluff-weight of filamentous material)
× 100 / weight of fluff The second feature of the bag for disposable body warmer of the present invention is that it is formed by folding a sheet made of a non-woven cotton fiber web in two.
A strip of synthetic fiber non-woven web having a width of 3 to 10 mm was interposed between the two sheet portions on the remaining three sides except the connection portion along the folding curve of the sheet portion, and the strip portion was interposed. The point is that the portion is bonded by ultrasonic welding and the two sheet portions are joined to each other on the remaining three sides excluding the connecting portion along the folding curve to form a disposable body warmer bag.

The synthetic fiber nonwoven web used in the present invention is made of a fiber-forming polyolefin-based polymer, polyester-based polymer or polyamide-based polymer.

The polyolefin polymer is an aliphatic α-monoolefin having 2 to 18 carbon atoms, such as ethylene, propylene, butene-1, pentene-1,3-methylbutene-1, hexene-1, octene-1. , A homopolyolefin polymer composed of dodecene-1 and octadecene-1. This aliphatic α-monoolefin is a derivative of other ethylenically unsaturated monomers such as butadiene,
It may be a polyolefin copolymer obtained by copolymerizing similar ethylenically unsaturated monomers such as isoprene, pentadiene-1,3, styrene and α-methylstyrene. In the case of a polyethylene-based polymer, propylene, butene-1, hexene-1, octene-1 or a similar higher α-olefin is 10% by weight with respect to ethylene.
The following may be copolymerized, and in the case of a polypropylene polymer, ethylene or a similar higher α-olefin may be copolymerized with propylene in an amount of 10% by weight or less, When the copolymerization rate of these copolymers exceeds the above-mentioned weight%, the melting point of the copolymer is lowered, and a composite nonwoven web obtained by using a nonwoven web made of fibers of these copolymers under high temperature conditions. When used, mechanical properties and dimensional stability deteriorate, which is not preferable.

As the polyester polymer, an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, or an aliphatic dicarboxylic acid such as adipic acid or sebacic acid or an ester thereof is used as an acid component. And a homopolyester polymer or copolymer containing a diol compound such as ethylene glycol, diethylene glycol, 1.4-butadiol, neopentyl glycol, or cyclohexane-1-4-dimethanol as an ester component. In addition, these polyester polymers include paraoxybenzoic acid, 5
-Sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythritol, bisphenol A and the like may be added or copolymerized.

Polyamide-based polymers include polyimino-1-oxotetramethylene (nylon 4), polytetramethylene adipamide (nylon 46), polycapramide (nylon 6), polyhexamethylene adipamide (nylon 66), Polyundecanamid (nylon 11),
Examples thereof include polylaurolactamide (nylon 12), polymethaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexylmethane decanamide, and polyamide copolymers having these monomers as constituent units. Particularly, in the case of polytetramethylene adipamide, polytetramethylene adipamide is obtained by copolymerizing other polyamide components such as polycapramide, polyhexamethylene adipamide and polyundecamethylene terephthalamide in an amount of 30 mol% or less. It may be a tetramethylene adipamide-based copolymer. The copolymerization rate of the other polyamide component is 30.
When the content is more than mol%, the melting point of the copolymer is lowered, and when a composite nonwoven web obtained by laminating a cotton fiber nonwoven web on a nonwoven web made of fibers of these copolymers is used under high temperature conditions. However, mechanical properties and dimensional stability are reduced, which is not preferable.

In the present invention, the above-mentioned fiber-forming thermoplastic polymer may include, for example, a matting agent, a pigment, a flameproofing agent, a deodorant, a light stabilizer, a heat stabilizer, if necessary. Various additives such as antioxidants can be added within a range that does not impair the effects of the present invention.

The fibers constituting the synthetic fiber non-woven web of the present invention are composed of the above-mentioned polymer having a fiber-forming property. It may consist of a blended product in which two or more different polymers selected from the coalesce are blended within a range that does not impair the melt spinnability. In this blend, for example, a blend of a polyester polymer and a polyolefin polymer or 2
Examples include blends of different polyamide polymers. In the former case, the shrinkage of the non-oriented polyester component can be suppressed immediately after melt spinning, which is particularly preferable. Further, the morphology of this fiber may be one in which two different polymers selected from the above polymers are arranged in a core-sheath type or a parallel type. In this compound,
For example, a core-sheath type in which a polyethylene terephthalate polymer is arranged in a core portion and a polyethylene polymer in a sheath portion is arranged, or a composite form such as a parallel type composed of a polycapramide polymer and a polyhexamethylene adipamide polymer is exemplified. .

When the synthetic fiber non-woven web of the present invention is composed of long fibers, the non-woven web obtained by the spunbond method, melt blow method, flash method, etc. is formed by a card machine when it is composed of short fibers. After forming a card web, a non-woven web subjected to heat pressure contact is used.

The single fiber fineness of the fibers constituting the synthetic fiber non-woven web of the present invention is preferably 1.5 to 8.0 denier. When the monofilament fineness is less than 1.5 denier, the mechanical properties of the obtained web are deteriorated, and the spinnability is deteriorated in the melt spinning step. On the other hand, when the monofilament fineness is more than 8.0 denier, it is obtained. In addition, the texture of the web becomes hard and a web having a high flexibility cannot be obtained, which is not preferable. Therefore, in the present invention, the single fiber fineness is preferably 1.5 to 8.0 denier, more preferably 2.0 to 5.0 denier.

A third feature of the disposable body warmer bag of the present invention is that the strip-shaped piece interposed between the two sheet portions made of the folded cotton fiber nonwoven web is made of the synthetic fiber nonwoven web. In addition, the fibers constituting the non-woven web are partially heat-pressed to each other. The partial hot press contact is a web of a portion corresponding to the engraved pattern by passing the web between a heated roll having an engraved pattern engraved on the surface, that is, an embossing roll and a heated metal roll having a smooth surface. This is to thermally bond the constituent fibers together. More specifically, this partial hot-pressing has a certain area relative to the total surface area of the synthetic fibrous non-woven web, that is to say that the individual hot-pressing areas do not necessarily have a circular shape. It has an area of 0.1 to 1.0 mm ² , and its density, that is, the pressure contact density is ² to 80 points / cm ^2, preferably 4 to 60 points / cm ² . If the pressure contact density is less than 2 points / cm ² , the mechanical properties and shape retention of the web after heat pressure bonding will not be improved, while if the pressure contact density exceeds 80 points / cm ^{2, it} will be flexible and bulky. The property is not improved, which is not preferable.

Further, the ratio of the area of the total heat-pressed area to the total surface area of the synthetic fiber non-woven web, that is, the press-contact area ratio is 2 to
30%, preferably 4 to 20%. If the press contact area ratio is less than 2%, the dimensional stability of the nonwoven web after hot pressing will not be improved, and therefore, the composite nonwoven fabric obtained by laminating the synthetic fiber nonwoven web and the cotton fiber nonwoven web. The dimensional stability of the woven web is poor, which is not preferable.

The disposable body warmer bag of the present invention can be formed into a bag by performing an adhesion process by the following method. That is, the cotton fiber non-woven web produced by the above method is cut into the shape shown in FIG. 1, then the sheet made of the cotton fiber non-woven web is folded in two, and two sheets formed by this are formed. A strip of synthetic fiber non-woven web having a width of 3 to 10 mm is interposed between the two sheet portions on the remaining three sides excluding the connecting portion along the folding curve of the portion, and the portion where the strip is interposed is superposed. Adhesive processing is performed by a sonic welder process, and two sheet portions are joined to form a bag shape on the remaining side excluding the connection portion along the folding curve.

The ultrasonic welding machine used for manufacturing the disposable body warmer bag of the present invention has an oscillation frequency of 1
It is composed of an ultrasonic transmitter of 9 to 22 KHz, an ultrasonic amplifier, a vibrating plate, and an engraving roll for ultrasonic welding. As the engraving roll, one in which dot-shaped or strip-shaped ultrasonic welder portions are arranged in one row or a plurality of rows in the circumferential direction of the roll is used. The pressing pressure of this engraving roll is in the range of 0.5 to 5 kg / cm.

In the bag for disposable body warmers of the present invention,
The non-woven cotton fiber web prior to lamination can optionally be post-processed such as printed or dyed.

[0037]

With this structure, except for the part where the two sheet parts are joined, the other part is composed only of the non-woven cotton fiber web, so that it is hygroscopic, soft to the touch and soft. It is possible to provide a disposable body warmer bag having excellent properties. In addition, since the strip-shaped piece made of the synthetic fiber non-woven web is interposed in the portion where the two sheet portions are joined together, excellent mechanical properties and dimensional stability as a disposable body warmer bag can be obtained. Also, two sheets of the non-woven fiber of the above-mentioned cotton fiber non-woven web are embedded in the fusion part of the synthetic fiber of the above-mentioned non-woven web of the synthetic fiber in the remaining side of the two sheet parts excluding the connection part along the folding curve. Since the sheet parts are joined together, a disposable body warmer bag having excellent peeling resistance can be obtained.

[0038]

EXAMPLES The present invention will be described below based on examples. In the present invention, the measurement was performed by the following method.

MFR (melt flow rate) value (g / 1
0 minutes); measured by the method described in ASTM D1238 (L).

Tensile strength (kg / 5 cm width) of non-woven fabric; using a constant speed extension type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.), JIS L-
It was measured according to the strip method described in 1096. That is, the sample piece 10 having a sample width of 5 cm and a sample length of 10 cm
Prepare a piece, measure the maximum tensile strength (kg) for each sample at a tensile speed of 10 cm / min, and divide the average value of the obtained tensile strength values by the sample width of 5 cm to obtain the tensile strength of the nonwoven fabric. (Kg / 5 cm width).

Bulk density of nonwoven fabric (g / cc); sample width 10
cm, sample length of 10 cm, 5 pieces were prepared, and 4.5 g / cm with a thickness measuring instrument manufactured by Daiei Chemical Seiki Co., Ltd.
The thickness of each non-woven fabric was measured by unloading a load of ² , Gg, and the average value was taken as the thickness, and the bulk density of the non-woven fabric was determined by the following calculation method. Bulk density (g / cc) = (unit weight) / (thickness) / 1000

Compressive bending resistance (g): A total of 5 sample pieces each having a sample length of 10 cm and a sample width of 5 cm were prepared, and each sample piece was bent in the lateral direction to form a cylindrical body, and the end portions thereof were respectively formed. The joined one was used as a sample for measuring compression stiffness. Next, a constant speed extension type tensile tester (Tensilon UTM-4-1-10 manufactured by Toyo Baldwin Co., Ltd.) is used for each measurement sample in the width direction.
0) was used for compression at a compression rate of 5 cm / min, and the average value of the maximum load values (g) obtained was taken as the compression stiffness (g).

Delamination strength (kg / 5 cm width): Laminated nonwoven web adhered by an ultrasonic welder, centered on the ultrasonic welder, width 5 cm, length from the ultrasonic welder 7.5 cm each
5 sample pieces are prepared, and each sample piece is subjected to a constant-speed extension type tensile tester (Tensilon UTM manufactured by Toyo Baldwin Co., Ltd.).
-4-1-100) was used to measure the maximum tensile strength by measuring at a tensile speed of 10 cm / min, and the average value of the obtained tensile strengths was used as the peel strength between layers (kg / 5 cm width).

Dust collection efficiency (%); 20 cm × 20 c
5 pieces of m-sized sample were prepared and the dust collection efficiency was measured by the following method. The obtained measurement value of 85% or more was a non-woven web having a good heating element leakage prevention effect. And That is, the measurement sample was provided in a wind tunnel having a diameter of 120 mm, and the average particle diameter of latex as dust was 5 μm, and the dust concentration was 15 mg / m ³ ,
It was supplied at a flow rate of 5 m / min, the dust concentration before and after the measurement sample was measured, and the leakage prevention effect of the heating element was judged by the amount of passing dust. Before and after the measurement sample, an optical scattering type digital display dust meter was provided as a dust concentration measuring instrument to measure the concentration A before the sample and the concentration B after the sample. The dust collection efficiency was calculated by the following formula. Dust collection efficiency (%) = (A−B) × 100 / A

Example 1 As the cotton fiber non-woven web, bleached cotton with an average fineness of 1.5 denier and an average fiber length of 25 mm was used.
A 0 g / m ² cotton fiber nonwoven web was obtained. This non-woven cotton fiber web is placed on a 70-mesh net that moves at 20 m / min, and the injection hole diameter is 0.1 mm and the injection hole interval is 0.6 mm from a position 50 mm above the non-woven cotton fiber web.
As a first preliminary entanglement, the entanglement treatment was carried out with normal temperature water having a water pressure of 30 kg / cm ² G from the injection holes arranged in a row, and subsequently, as the second entanglement treatment, the same net as above and the injection were performed. Water pressure 70kg / cm ²
The entanglement treatment was performed 4 times by the water pressure of G.

Further, as the third entanglement treatment, using the same net and injection holes as above, the cotton fiber non-woven web subjected to the entanglement treatment is reversed, and the same entanglement treatment as the second time is conducted five times. Was entangled to obtain a cotton fiber non-woven web in which the front and back sides were closely entangled.

The obtained cotton fiber non-woven web was subjected to a drying treatment at a temperature of 100 ° C. after removing excess water with a mangle. The resulting nonwoven web has a basis weight of 10
Both sides of 0 g / m ² had dense three-dimensional entanglement.

The resulting cotton fiber nonwoven web is subsequently
It was introduced between two rolls having a surface temperature of 125 ° C., the linear pressure between the rolls was set to 100 kg / cm, and pressure treatment was performed. The obtained cotton fiber nonwoven web has a tensile strength of 10.5 kg / 5.
The width was cm, the compression bending resistance was 35 g, the dust collection efficiency was 95%, and the bulk density was 0.45 g / cc, which was excellent in strength, flexibility, and leakage prevention effect of the heating element.

Further, the synthetic fiber nonwoven web has a melting point of 156 ° C., a density of 0.98 g / cc and an MFR value of 56 g /
Synthetic long fiber nonwoven webs were produced by the spunbond method using 10 minute polypropylene polymer chips. That is, the polymer chips are melted, melt-spun through a spinning hole at a spinning temperature of 250 ° C., the melt-spun polymer stream is cooled, and then a take-up speed of 480 is applied using an air sucker.
After being collected at 0 m / min, it was opened using a corona discharge means, collected and deposited on a moving collecting surface to obtain a web composed of fibers having a single fiber fineness of 3.0 denier, and then obtained. 20g / m ² by applying a hot press treatment to the web
Got a web of. When performing the heat pressure welding process, an engraved pattern with an area of 0.36 mm ² has a pressure contact density of 40 points / cm ^2.
In addition, an embossing roll arranged with a pressing area ratio of 15% and a metal roll having a smooth surface were used. The surface temperature of the embossing roll and the metal roll having a smooth surface was set to 135 ° C., and the linear pressure between both rolls was set to 10 kg / cm.

As a method of processing the material into a bag shape, the above cotton fiber non-woven web is 20 cm wide and 1 cm long.
Cut into 5 cm and fold in two in the width direction to form two sheet parts, and between the two sheet parts on the remaining three sides except the connection part along the folding curve of these two sheet parts. A band-shaped piece made of the synthetic long-fiber non-woven fabric cut into a width of 10 mm was interposed, and in this portion, square engravings each having an area of 2 mm ² were arranged on the circumference in three rows at 1.5 mm intervals. Ultrasonic processing roll, roll pressure 2kg
/ Cm ² , the ultrasonic wave transmission frequency was 19.7 KHZ, and the feeding speed was 5 m / min, the ultrasonic welding process was performed to form a disposable body warmer bag.

The peel strength between layers of the ultrasonic welder-treated portion of the obtained disposable body warmer bag was 1.
The width was 5 kg / 5 cm, which was practically usable. As is clear from the examples, the disposable body warmer bag of the present invention is made of cotton (softness, water absorption) and spunlace (flexibility), and has a soft touch feeling.

Comparative Example 1 The conditions were the same as in Example 1 except that the pressure treatment by the roll was not performed.

The resulting cotton fiber non-woven web has a tensile strength of 1
It had a width of 0.5 kg / 5 cm and a bending stiffness of 28 g, and was strong and flexible, but had a bulk density of 0.08.
g / cc, depending on the pore shape of the porous support plate due to the action of the high-pressure liquid flow, the openings remain in the nonwoven web,
The collection efficiency of dust was 65%, which was not suitable as a bag for disposable body warmers.

[0054]

As described above, according to the present invention, since the other parts except the part where the two sheet parts are joined are made of only the cotton fiber non-woven web, the hygroscopic property, It is possible to provide a bag for disposable body warmers which is excellent in soft feeling and flexibility. In addition, since the strip-shaped piece made of the synthetic fiber non-woven web is interposed in the portion where the two sheet portions are joined together, excellent mechanical properties and dimensional stability as a disposable body warmer bag can be obtained. Also, two sheets of the non-woven fiber of the above-mentioned cotton fiber non-woven web are embedded in the fusion part of the synthetic fiber of the above-mentioned non-woven web of the synthetic fiber in the remaining side of the two sheet parts excluding the connection part along the folding curve. Since the sheet parts are joined together, a disposable body warmer bag having excellent peeling resistance can be obtained.

[Brief description of drawings]

FIG. 1 is a development view of a bag for disposable body warmers of the present invention.

FIG. 2 is a perspective view showing a state just before the completion of the disposable body warmer bag of the present invention.

[Explanation of symbols]

 1 Sheet made of cotton fiber non-woven web 2a Sheet part 2b Sheet part 3 Connecting part 4 Strip-shaped piece made of synthetic fiber non-woven web 5 Bonding part

Claims (2)

[Claims] 1. A sheet made of a non-woven cotton fiber web is 2
It is equipped with two sheet parts that are folded and formed.
From the synthetic fiber non-woven web, a strip of synthetic fiber non-woven web made of a thermoplastic synthetic polymer is interposed between the two sheet parts on the remaining side of the one sheet part excluding the connection part along the folding curve. The two intervening strips are joined between two sheet parts in a state where the cotton fibers located at least at the boundary surface of both the non-woven webs are buried in the fusion part of the synthetic fibers. A bag for disposable body warmers. 2. A cotton fiber non-woven web having a basis weight of 60 to 2
The bag for disposable body warmers according to claim 1, wherein the bag has a bulk density of 00 g / m ² and a bulk density of 0.3 to 0.7 g / cc.