JP2007197028A - Bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag which has a superior powder leakage property, a heat seal process property, seal strength, etc. <P>SOLUTION: A laminated nonwoven fabric is made by stacking a first layer made of a thermoplastic synthetic fiber, a second layer made of an extra-fine fiber, and a third layer containing a thermoplastic synthetic fiber having a melting point 30°C or more lower than that of the fiber composing the first layer, and putting the laminate into an integral form by heat pressure bonding. Sheets of the laminated nonwoven fabric are superposed one another with the third layer disposed inside, and the periphery of the superposed sheets is heat sealed to form a bag. The laminated nonwoven fabric forming the bag shows a gas permeability of 1 to 100 cc/cm<SP>2</SP>/sec., a maximum opening diameter of 50 μm or less, a powder leakage rate of 10% or lower, and a rupture strength of 100 kPa or higher, and the third layer shows a seal strength of 10 N/25 mm or higher. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a bag body, and in particular, a bag body excellent in powder leakage prevention and heat sealability, which can be used for packaging powder, granular materials, etc., a bag body filled and sealed with the granular materials, and the bag The present invention relates to a laminated nonwoven fabric used for a body.

Thermoplastic synthetic fiber nonwoven fabrics are widely used as packaging sheets for particles having dehumidifying and deodorizing effects such as silica gel and titanium oxide. However, the conventional nonwoven fabric has a problem that fine particles of the contents leak because the fiber gap is too large. For example, in Literature 1, two sheets having air permeability and translucency are overlapped, and an absorption chamber is provided by integrally joining a plurality of locations, and the absorption chamber is filled with a deodorant and a dehumidifying agent. Deodorizing and dehumidifying sheets used for mattresses and the like have been proposed. However, when the particles of the substance to be filled are fine or when the particles are easily crushed, there is a problem that powder leakage occurs. For this reason, the dehumidifying agent and deodorizing agent to be filled are limited to those having a large particle diameter, and there is a problem that the filling cannot be performed in the case of charcoal, etc., whose particles are easily crushed.
JP 2000-202011 A

  The subject of this invention is solving the said problem and providing the laminated body used for the bag body which can be filled and packed with a powder, a fine particle, etc., the bag body containing a granule, and this bag body.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above-mentioned problems can be achieved by selecting the melting point, fiber diameter, material, laminating method, etc. of the fibers of thermoplastic fibers and ultrafine fibers. The present invention has been reached. The invention claimed in the present application is as follows.
(1) The first layer of thermoplastic synthetic fiber layer, the second layer of ultrafine fiber layer, and the third layer are laminated with a layer containing thermoplastic synthetic fibers having a melting point of 30 ° C. or more lower than the melting point of the constituent fibers of the first layer. The laminated nonwoven fabric integrated by thermocompression bonding is further overlapped with the third layer on the inside, and the periphery that becomes the bag body is heat sealed, and the laminated body forming the bag body The nonwoven fabric must have air permeability of 1 to 100 cc / cm ² / sec, maximum pore size of 50 μm or less, powder leakage rate of 10% or less, burst strength of 100 kPa or more, and third layer seal strength of 10 N / 25 mm or more. A bag characterized by.
(2) The bag according to (1), wherein the melting point of the fibers constituting the third layer is lower in the range of 50 to 150 ° C. than the melting point of the fibers constituting the first layer.
(3) The thermoplastic fiber of the third layer is a sheath-core type composite fiber, the core part is a high melting point component, and the sheath part component is 30 ° C. or more lower melting point than the core part (1) ) Or (2).
(4) The bag according to (1) or (2), wherein the thermoplastic fiber of the third layer is made of an aromatic polyester copolymer.
(5) A bag containing granules, wherein the bag according to any one of claims 1 to 4 is filled with powdered or granular granules and sealed.
(6) The bag-shaped bag body according to (5), wherein the bag body is in a continuous form, and is filled with powder or granular granules in each continuous unit and sealed. .
(7) The granule is selected from coffee powder, tea leaves, silica gel, natural zeolite, synthetic zeolite, activated carbon, desiccant, deodorant, exothermic composition and dashi powder (5) ) Or a bag containing the granule according to (6).
(8) A laminated nonwoven fabric used for the bag according to (1).

  According to the bag of the present invention, the ultrafine fiber layer is coated and / or mixed into a thick fiber gap layer by laminating the first layer and third layer thermoplastic fibers and the second layer of ultrafine fibers. Thus, since the laminated nonwoven fabric has a very small gap between the constituent fibers, leakage of fine particles can be prevented. Furthermore, by providing a synergistic effect of providing a difference in melting point between the first and third layers of thermoplastic fibers to be laminated and interposing an ultrafine fiber layer therebetween, partial thermocompression bonding is performed well, Bonding becomes stronger. Furthermore, since heat seal processing between the third layer surfaces for forming the bag body is possible in a wide temperature range, stable sealing strength can be obtained. Therefore, a bag filled with powder and granular contents has little powder leakage and excellent sealing properties.

The nonwoven fabric forming the bag of the present invention has a thermoplastic resin (S) having a high melting point in the first layer, ultrafine fibers (M) in the second layer, and a temperature of 30 ° C. lower than the melting point of the first layer fibers. A laminated nonwoven fabric having an S / M / W structure in which thermoplastic fibers (W) having a melting point are laminated and integrated by thermocompression bonding.
In particular, by adopting a laminated structure in which the second layer of ultrafine fibers is interposed, firstly, the fiber gap can be reduced, and secondly, the bonding between the layers can be strengthened by partial thermocompression bonding. By providing a difference in melting point between the first layer and the third layer and interposing an ultrafine fiber layer, it is possible to obtain characteristics such as wide heat seal strength and a wide temperature range.

The small fiber gap, which is the first feature, is because ultrafine fibers are coated and / or mixed into a relatively large fiber gap layer of thermoplastic fibers and laminated. Furthermore, when the lamination is made into multiple layers, the fiber gap is further reduced, and a structure in which powder leakage is difficult to occur is obtained.
The second feature of partial thermocompression bonding is that the bonding temperature range can be widened by interposing ultrafine fibers having a low softening temperature, so that the bonding becomes strong and the peel strength between layers increases.
The heat sealability of the third feature provides a difference in melting point between the first layer and the third layer, has a wide softening temperature range, and has a laminated structure in which low ultrafine fibers are interposed. Since the bonding can be strengthened and the high melting point fiber surface comes into contact with the seal portion, the heat seal process can be stably performed over a wide temperature range without being fused to the seal portion.

  The high-melting thermoplastic synthetic fiber layer of the first layer used in the present invention is usually composed of thick fibers having a fiber diameter of 10 to 30 μm, and is preferably excellent in strength and air permeability and high in wear strength. Examples of such constituent fibers include synthetic fibers such as polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolyester, and polyamide fibers such as nylon 6, nylon 66, and copolyamide fibers.

  The third thermoplastic synthetic fiber layer used in the present invention is made of fibers having a melting point lower by 30 ° C. or more than the fibers of the first layer, and serves as a heat seal surface of the bag structure. A thick fiber having a fiber diameter of 10 to 30 μm is preferable. Examples of constituent fibers include olefin fibers such as low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, copolymer polypropylene, polyethylene terephthalate, phthalic acid, isophthalic acid, sebacic acid, adipic acid, diethylene glycol, 1,4 -Synthetic fibers such as aromatic polyester copolymers obtained by copolymerizing one or more butanediol compounds, polyester fibers such as aliphatic polyesters, and copolymerized polyamide fibers are used. Furthermore, a composite fiber composed of two components such as a core-sheath structure, side-by-side, for example, a composite fiber having a high melting point and a low melting point, specifically, a core is polyethylene terephthalate, polybutylene terephthalate, copolymer polyester, High melting point fibers such as nylon 6, nylon 66 and copolymerized polyamide, and low melting point fibers such as low density polyethylene, high density polyethylene, polypropylene, copolymerized polyethylene, copolymerized polypropylene and aliphatic polyester are preferred.

  The laminated nonwoven fabric of the present invention has a melting point difference between the fibers of the first layer and the third layer, but the difference in melting point of the fibers constituting the third layer is preferably 50 to 150 ° C., more preferably 50 to 130. It is preferable that the temperature is lower than that of the first layer in the range of ° C. As a result, the roll temperature range during partial thermocompression bonding can be set wide. When the difference between the upper and lower thermocompression-bonding roll temperatures exceeds 150 ° C., the low-melting fiber tends to deteriorate due to the influence of the roll temperature on the high melting point side. On the other hand, when there is no difference in melting point between the first layer and the third layer, the thermocompression bonding temperature range becomes narrow, and the strength and friction fluff strength are easily affected by the roll temperature conditions.

The fiber diameter of the ultrafine fibers of the second layer of the present invention is preferably 7 μm or less, more preferably 1 to 5 μm, and has the role of reducing the fiber gap and the maximum pore diameter and reducing powder leakage. In particular, by laminating the fine fiber gaps so that the fine fibers are covered, the fiber gaps can be reduced with a small fine fiber ratio. When the fiber diameter exceeds 7 μm, the effect of covering the fiber gap decreases.
The basis weight of the ultrafine fibers is preferably 1 g / m ² or more, more preferably ^{2 to} 15 g / m ² , and further preferably 3 to 10 g / m ² .

  The ratio of the ultrafine fibers of the second layer to the thermoplastic fibers of the first layer and the third layer is usually 5 to 50%, preferably 10 to 40%. Examples of ultrafine fibers include polyolefin fibers such as polyethylene and polypropylene, polyamide fibers such as nylon 6 and nylon 66, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, copolymerized polyester, and aliphatic polyester, and composite fibers. Synthetic fibers such as multi-component fibers are used.

  The integration of the laminated nonwoven fabric of the present invention by thermocompression bonding means, for example, heating and pressure bonding between a known embossing roll and a smooth roll to join them. The heating temperature is a temperature range from the temperature above the softening temperature of the fiber to below the melting point. However, in consideration of thermal degradation of the low melting point fiber, the temperature difference between the upper and lower rolls is preferably 150 ° C. or less, preferably 130 ° C. or less. The pressure for thermocompression bonding is 10 to 1000 kPa / cm, preferably 50 to 700 kPa. The crimping area ratio is 5 to 30%, preferably 7 to 25%. If the crimping area ratio is less than 5%, the bonding area decreases and the wear strength decreases. On the other hand, if it exceeds 30%, the wear strength increases, but the texture becomes paper-like.

  The bag-making process of the bag according to the present invention is performed by sealing with a known sealing method using the third layer of the laminated nonwoven fabric as a sealing surface. For example, it can be performed by a heat sealing method such as a three-pack sealing machine or a four-pack sealing machine, or an ultrasonic sealing method such as an ultrasonic sealing machine. Furthermore, it is possible to form a bag into two or more continuous continuous bags.

  The bag body of the present invention requires high sealing strength because, for example, the filling material filled in the bag does not drop or the bag is not broken when a heavy object is placed thereon. Accordingly, the sealing strength of the bag body is 10 N / 25 mm or more, preferably 15 N / 25 mm or more, more preferably 20 to 50 N / 25 mm. When the peel strength is less than 10N, the seal portion is easily peeled off, and problems such as leakage of contents to the outside occur.

  Furthermore, in order to carry out the bag making process stably, it is necessary that the sealing temperature range is wide. For example, the temperature range is preferably 50 ° C. or higher and 150 ° C. or lower. This is because it is difficult to control the temperature of the sealing portion of the sealing machine to a constant temperature, for example, the temperature gradually increases from the start and further changes depending on the environmental temperature. When the temperature range needs to be set in a narrow range of less than 50 ° C., there arises a problem that the seal strength changes due to the influence of the environmental temperature, the heat storage of the heater section, and the like. On the other hand, in the temperature range exceeding 150 ° C., the physical properties are lowered due to thermal deterioration of the low melting point fiber.

  The sealing temperature range of the laminated nonwoven fabric of the present invention is wide and the sealing strength is high and stable. The difference between the melting points of the first and third layers is 30 ° C. or more. Therefore, even if the fibers of the low melting point layer are softened or melted, the high melting point fibers maintain a predetermined fiber shape.

The basis weight of the laminated nonwoven fabric of the present invention, the intensity of interest, 15~120g / m ² from breathable, preferably 20 to 100 g / m ^2. If the basis weight is less than 15 g / m ² , the strength decreases. On the other hand, if it exceeds 120 g / m ² , the strength increases, but the texture and breathability deteriorate.

The air permeability of the laminated nonwoven fabric of the bag body of the present invention is 1-100 cc / cm in order to sufficiently exhibit its effect to the extent that powder leakage such as a deodorant and a dehumidifying agent filled in the bag body does not occur. ² / sec, preferably 5 to 90 cc / cm ² / sec. If the air permeability is less than 1 cc / cm ² / sec, the air flow is reduced, and the effects of the deodorant and dehumidifier are reduced. On the other hand, if it exceeds 100 cc / cm ² / sec, air circulation is sufficient, but powder leakage tends to occur.

  The maximum pore diameter of the laminated nonwoven fabric of the present invention is 50 μm or less, preferably 1 to 40 μm, more preferably 3 to 30 μm. When the maximum opening diameter exceeds 50 μm, the fiber gap is large, and therefore powder leakage easily occurs. In particular, when the granular material is broken, powder leakage easily occurs.

The burst strength of the laminated nonwoven fabric of the present invention is 100 kPa or more, preferably 120 to 1000 kPa.
This is made into a bag body by heat sealing etc. using the laminated nonwoven fabric of the present invention, filled with deodorant, dehumidifying agent etc. of particle size inside, and when it falls, it does not break when a person gets on Is necessary for.

  The tensile strength of the laminated nonwoven fabric of the present invention is 50 N / 5 cm or more, preferably 60 N / 5 cm or more. This is necessary because the laminated nonwoven fabric of the present invention is used to form a bag and the bag is not broken even if the contents are filled. When the tensile strength is less than 50 N / 5 cm, the strength is insufficient and the bag is easily broken.

  The powder leakage rate of the bag (laminated nonwoven fabric) of the present invention is 10% or less, preferably 5% or less, more preferably 3% or less. About 10g of JIS standard dust was collected from the powder leakage rate, weighed (W0), placed a fixed amount of dust on the measurement sample using a shaker, set and vibrated for 10 minutes. Then, the dust weight (W1) that has passed through the measurement sample under the shaker is measured and obtained from the formula W1 / W0 × 100.

  The content to be filled in the bag of the present invention is not particularly limited as long as it is a solid material such as a powder shape, a granular shape sheet material, etc., except for those that absorb moisture in the air and become deliquescent or liquid. . For example, gas adsorption of desiccant that does not become liquid by adsorbing moisture such as silica gel, alumina gel, silica alumina gel, natural zeolite, synthetic zeolite, activated carbon, coconut husk activated carbon, Bincho charcoal, zinc oxide, titanium oxide, porous powder, etc. And gas decomposable powders, granular materials, exothermic compositions that react with oxygen in the air, such as iron powder and salt, coffee powder, tea leaves, bonito, dried powder such as boiled rice, feathers, and the like.

  The bag in the present invention can be used repeatedly several times in the function recovery process of the contents. For example, when the dehumidifying / deodorizing agent bag of the present invention is used under the mattress, the dehumidifying agent, deodorizing agent, etc. inside the bag absorbs sweat, odor and the like generated from the human body. The bag body that has sufficiently absorbed odor, moisture, etc. is dried in the sun to recover the dehumidifying / deodorizing agent bag body of the present invention in its original state. Therefore, the surface layer of the dehumidifying / deodorizing agent bag body of the present invention needs to have a friction strength that can withstand repeated use. The bag of the present invention preferably has a wear resistance of 3 or more. If the wear resistance is less than grade 3, fluffing is likely to occur with repeated use.

The present invention will be described based on examples.
The measurement method is as follows.
(1) Weight per unit area (g / m ² ): A sample of 20 cm in length × 25 cm in width is cut out at three places, the weight is measured, and the average value is calculated by converting to mass per unit. (JIS-L-1906)
(2) Average fiber diameter (μm): Take a 500 times magnified photograph with a microscope, and obtain the average value of 10 fibers.
(3) Breathability: Conforms to JIS-L-1906 Frajour method.
(4) Powder leakage rate (%): About 10g of 7 kinds of dust for JIS-Z-8901 test, measure the weight W1 accurately, cut a 25cm square sample, attach it to the vibrator, and vibrate for 10 minutes The dust weight W2 that the sample has passed through is measured and obtained from the following formula.
Powder leakage rate (wt%) = W2 / W1 x100
(5) Burst strength (kPa): According to JIS-L-1906, three or more locations were measured with a Murren type tester, and the average value was shown.
(6) Maximum aperture diameter (μm): Conforms to the bubble point method (JIS-K-3832).
Sample: 40mm diameter circle
(1) Fill the sample with a liquid, and use capillary action so that the liquid is in all the pores of the sample.
(2) Air pressure is gradually applied from the lower surface of the sample, and bubbles appear when the gas pressure overcomes the liquid surface tension in the capillary tube.
(3) At this time, bubbles appear first from the largest pores, and the maximum pore diameter can be calculated by measuring the gas pressure at that time.
(7) Surface wear strength (class): Using a Gakushin-type wear tester, attach a measurement sample to the friction side, and determine in an observation state with a load of 500 g and a friction of 100 times.
Grade 5: No fiber fluff. Grade 4: Slightly fuzzy fibers but not noticeable.
Grade 3: Small fluff of fibers is inconspicuous, but Grade 2: Fluff of fibers is present throughout and is conspicuous. First grade: The fiber is very fuzzy.
(8) Tensile strength (N / 5cm): Using a constant-length tensile tester, cut a sample width of 5cm and a length of 30cm, measure the tensile strength at 3 points each in the vertical and horizontal directions with a gripping interval of 20cm and a tensile speed of 10cm / min. The average value of maximum strength (vertical + horizontal) / 2 is shown.
(9) Seal strength (N): Using a constant-length tensile tester, cut a sample width of 25 mm and a length of 200 mm, peel the heat seal part up and down about 50 mm, and attach each so that it peels 180 degrees. The peel strength was measured at 3 points each at a tensile rate of 10 cm / min and indicated by the average value of the maximum strength.
However, seal temperature 150 ° C, time 1 second, pressure 5500kPa, seal area 7mm x 25mm

[Examples 1-2]
The thermoplastic fiber web that is the third layer of the laminated nonwoven fabric of the present invention has an average fiber diameter of 16 μm and a basis weight of a core-sheath structure in which the core is made of polyethylene terephthalate and the sheath is made of high-density polyethylene. A composite fiber web with different thicknesses was prepared, and the second layer of polyethylene terephthalate (solution viscosity ηsp / c 0.50) was used to change it as a thermoplastic fiber web on a collection net. Then, the spinning temperature is 300 ° C., the heating air is 320 ° C. and 1000 Nm ³ / hr, the average fiber diameter is 2 μm, the ultrafine fiber webs with different basis weights are discharged and laminated, and the first layer of general polyethylene A terephthalate spunbond spinneret is spun at 300 ° C with an average fiber diameter of 14 µm and a thermoplastic fiber web with a different basis weight. Laminating Te, which crimp area ratio, at 12, 25% embossing roll, Sen圧 350 N / cm, to obtain a bag of Example 1-2 up and down temperature by thermal compression bonding at 220 ℃ / 110 ℃. The characteristics are shown in Table 1.

[Examples 3 to 4]
The thermoplastic fiber web, which is the third layer of the laminated nonwoven fabric of the present invention, is made of a spunbond spinneret and a fiber web with an aromatic polyester copolymer (melting point: 1165 ° C.) having an average fine diameter of 15 μm and a different basis weight. Using a second layer of polyethylene terephthalate (solution viscosity ηsp / c 0.50), from a melt-blow jet nozzle, spinning temperature is 300 ° C., heated air is 320 ° C. and 1000 Nm ³ / hr, average fiber diameter is 2 μm, basis weight Discharge and laminate ultrafine fiber webs with varying amounts, and heat the first layer of general polyethylene terephthalate from the spunbond spinneret at an average fiber diameter of 14 μm at a spinning temperature of 300 ° C. The plastic fiber web is laminated on the collection net as a laminated fiber web, and the crimping area ratio is 12, 25% embossing roll, gland pressure 350 N / cm, and the vertical temperature is 230 ° C / 145 ° C. To obtain a bag of Example 3-4 Te. The characteristics are shown in Table 1.

[Example 5]
The third layer of the laminated nonwoven fabric of the present invention is an average fiber diameter of 17 μm of a core-sheath structure in which a core is polyethylene terephthalate and a sheath is an aromatic polyester copolymer (melting point 165 ° C.) from a spunbond two-component spinneret. Composite fiber webs having different amounts were prepared, and the second layer of polyethylene terephthalate (solution viscosity ηsp / c 0.50) was used. From the melt blown nozzle, the spinning temperature was 300 ° C., the heating air was 320 ° C. and 1000 Nm ³ / hr, an ultrafine fiber web with an average fiber diameter of 2 μm and a different basis weight was discharged and laminated, and a first layer of general polyethylene terephthalate was spun onto the spunbond spinneret at an average fiber temperature of 300 ° C. A thermoplastic fiber web having a diameter of 14 μm and a basis weight changed was laminated as a laminated fiber web on a collection net, and the crimp area ratio was 25% embossed roll, gland pressure 350 N / cm, To obtain a bag of Example 5 under temperature thermocompression bonding at 230 ℃ / 145 ℃. The characteristics are shown in Table 1.

[Comparative Example 1]
Using general polyethylene terephthalate, a thermoplastic fiber web having an average fiber diameter of 14 μm and a basis weight of 50 g / m ² at a spinning temperature of 300 ° C. and the same melt blow method as in Example 1 was formed on the collection net, and the pressure-bonding area ratio Was a 12% embossed roll, thermocompression bonded at a gland pressure of 350 N / cm and an upper and lower temperature of 230 ° C./235° C. to obtain a nonwoven fabric.
[Comparative Example 2]
As the thermoplastic fiber web, a composite fiber web with a core-sheath structure with a core-sheath structure made of polyethylene terephthalate and a sheath made of high-density polyethylene was prepared on the collection net, and the crimp area ratio was changed. A nonwoven fabric was obtained by thermocompression bonding with a 25% embossing roll at a gland pressure of 350 N / cm and an upper and lower temperature of 120 ° C./110° C.
The laminated nonwoven fabrics of Examples 1 to 5 of the present invention were excellent in powder leakage, strength, heat seal strength, air permeability, and the like. On the other hand, Comparative Example 1 was a non-woven fabric that had high powder leakage and was difficult to heat seal. Further, Comparative Example 2 also has problems such as high powder leakage and heat sealing, but low melting point fibers are fused to the seal portion.

[Examples 6 to 8]
With the same fiber configuration as in Examples 1 and ² , the seal strengths with different basis weights of ²⁰ , 30, and 50 g / m ² were measured.
[Examples 9 to 11]
With the same fiber configuration as in Example 5, the seal strengths with different basis weights of ²⁰ , 30, and 50 g / m ² were measured.

[Comparative Examples 3 to 5]
With the fiber configuration of Comparative Example 2, the seal strengths with different basis weights of ²⁰ , 30, and 50 g / m ² were measured. In Examples 6 to 11 in Table 2, the heat seal temperature range could be widened, and processing could be performed stably even when the fiber basis weight was changed, and excellent results in seal strength were obtained.
On the other hand, in the case of the low basis weight of Comparative Example 3, it becomes easy to fuse to the heat seal portion, and it is difficult to perform stable bag making. In Comparative Examples 4 to 5, the bag-making process can be performed, but the fiber fusion product adheres to the seal portion.

[Example 12]
Using two laminated nonwoven fabrics of 50 cm in width and 80 cm in length in Example 2, an interval equally divided into 10 in the width direction, a pitch in the length direction of 8 cm, a seal width of 1 cm, a heating of 165 ° C., a contact time of 1 second, a pressure of 5000 kPa The bag was processed under the conditions of At that time, about 4 g of mixed particles of 95% silica gel with a granulated particle size of 0.5-3 mm and mixed particles of 5% coconut shell activated carbon with a granulated particle size of 200-500 μm were put in a bag. A bag of the dehumidifying agent / deodorant of the present invention for packaging was prepared. When the sealing strength of the obtained bag was measured, it was 35 N / 25 mm, and the bag of the present invention was used between the mattress and the sheet. As a result of repeated use 10 times, the bag was not broken, the surface was not fuzzed, and no powder was leaked.

[Example 13]
Using two laminated nonwoven fabrics of 50 cm in width and 80 cm in length of Example 5, 10 intervals in the width direction, 8 cm intervals in the length direction, seal width 1 cm, heating 190 ° C., contact time 1.5 seconds, pressure 55000 kPa The bag was processed under the conditions. At that time, 90% silica gel with a particle size of 0.5-3 mm, 5% coconut shell activated carbon with a granulated particle size of 200-500 μm, and a synthetic zeolite supporting silver with a particle size of 100-500 μm 5% A bag of the dehumidifying agent / deodorant of the present invention in a continuous package containing about 4 g of the mixed particles was prepared.
When the sealing strength of the obtained bag was measured, it was 48 N / 25 mm, and the bag of the present invention was used between the mattress and the sheet. As a result of repeated use 10 times, the bag was not broken, the surface was not fuzzed, and no powder was leaked.

[Example 14]
The laminated nonwoven fabric of Example 2 having a slit width of 6 cm was cut using a known three-side sealing machine, with a sealing width of 1 cm, a temperature of 165 ° C., a contact time of 1.3 seconds, and a pressure of 5000 kPa under a bag making condition of 6 cm wide and 26 cm long. A bag was filled with 150 g of silica gel having a particle size of 0.5 to 3 mm to make a desiccant for a shoe and used to dry a boot for women. It could be used without problems such as broken bags, powder leakage, and surface fluff.

[Example 15]
Using a tetrahedral three-dimensional heat sealing machine, the laminated nonwoven fabric of Example 5 was slit into a tape having a width of 150 mm, and then a 760 dtex polypropylene yarn and a tag were bonded at a temperature of 180 ° C., Fold 150mm, heat seal at 1mm width and temperature of 185 ° C, and then heat seal the bottom of the tube at intervals of 70mm to make a bag shape, and then add Regila Coffee powder into the bag 10 g was added, and for each 70 mm length, the bag opening was heat-sealed in a right angle so as to be orthogonal to the bottom to obtain a tetrahedral coffee pack with a side of 70 mm.
About 200 cc of hot water was poured into the extraction cup containing the coffee pack of the present invention, and taken out after about 30 seconds. When I drank coffee, I was able to drink fragrant and delicious coffee. Little powder remained at the bottom of the cup.

The bag of the present invention is excellent in powder leakage, heat sealing workability, sealing strength, and the like, and can be used for a wide range of applications as a packaging material for contents such as powder and granular materials.

Claims (8)

A thermoplastic synthetic fiber layer of the first layer, an ultrafine fiber layer of the second layer, a layer containing a thermoplastic synthetic fiber having a melting point of 30 ° C. or more lower than the melting point of the constituent fibers of the first layer; The laminated nonwoven fabric integrated by pressure bonding is further laminated with the third layer inside, and a bag body is formed by heat-sealing the periphery of the bag body, and the ventilation of the laminated nonwoven fabric forming the bag body 1-100 cc / cm ² / sec, maximum pore size 50 μm or less, powder leakage rate 10% or less, burst strength 100 kPa or more, and third layer seal strength 10 N / 25 mm or more Bag to be.   2. The bag according to claim 1, wherein the melting point of the fibers constituting the third layer is lower in the range of 50 to 150 ° C. than the melting point of the fibers constituting the first layer.   The thermoplastic fiber of the third layer is a sheath-core type composite fiber, the core part is a high melting point component, and the sheath part component is 30 ° C or more lower melting point than the core part. The bag described in 1. The bag according to claim 1 or 2, wherein the thermoplastic fiber of the third layer is made of an aromatic polyester copolymer.   A bag body containing granules, wherein the bag body according to any one of claims 1 to 4 is filled with powder or granule granules and sealed.   The bag-containing bag body according to claim 5, wherein the bag body is in a continuous form, and each continuous unit is filled with a powder or granular granule and sealed.   7. The granule according to claim 5, wherein the granule is selected from coffee powder, tea leaves, silica gel, natural zeolite, synthetic zeolite, activated carbon, desiccant, deodorant, exothermic composition and dashi powder. A bag containing the granule according to 1. A laminated nonwoven fabric used for the bag according to claim 1.