JPH11100766A - Air-permeable bag cloth, and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a bag cloth suitable for excelling bedding sheets in sweat absorbability and the like. SOLUTION: This air-permeable bag cloth is obtained by superposing a polyethylene film 3 on a base cloth 2 made from a nonwoven fabric containing polyethylene fibers, thermally sealing the superposed film to the base cloth, and subsequently irradiating the polyethylene film 3 with laser light to form many fine poles 5 in the film. The obtained bag cloth is sewed into e.g. a bag, in which the particles of a moisture-absorbing substance are charged to give a sheet excellent in sweat absorbability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable bag fabric applicable to, for example, bedding and the like, and a method for producing the same.

[0002]

2. Description of the Related Art For example, in the case of beddings such as pillows, bedspreads, futons, etc., it absorbs sweat from the body and easily adheres to odors such as body odor. is there. Therefore, in order to maintain a comfortable feeling of use, bedding has been proposed in which a fine cloth such as charcoal having humidity control or hygroscopicity, deodorizing properties, etc. is used inside the cloth using a breathable surface cloth. . In addition, besides the bedding, there is a case where fine powder having humidity control property, hygroscopic property or the like is stored in a breathable bag and used. In these cases, conventionally, a bag (porous polyethylene) sheet or a film obtained by laminating a perforated film on a nylon spun bond is used as a bag material for containing fine powder.

[0003]

However, in the conventional bag cloth, since the hole diameter is relatively large, when the material put in the bag becomes fine powder, powder leakage occurs. He faced the trade-off problem of poor ventilation.

Accordingly, an object of the present invention is to obtain a bag cloth which can secure air permeability and prevent leakage of fine powder.

[0005]

According to the present invention, there is provided a bag fabric for obtaining a bag for containing fine powder, wherein a hole diameter of 20% is formed on an inner surface of a base fabric 2 made of a nonwoven fabric composed of fibers of 1.0 denier or less. It is characterized in that a plastic film 3 having a large number of fine holes 5 of up to 300 μm provided over the entire surface is bonded.

In the present invention, the base fabric 2 contains polyethylene fibers and has a basis weight of 100 to 300 g / m ² . If the basis weight of the base fabric 2 is less than this, a problem occurs in durability. In addition, the larger the basis weight of the base fabric 2 is, the higher the durability is, but the cost is increased. In consideration of these, the basis weight of the base fabric 2 is appropriately 100 to 300 g / m ² , preferably 130 to 180 g / m ² , and more preferably 130 to 140 g / m ² . Even if the basis weight of the base fabric 2 is specified, it is difficult to specify the thickness because the thickness varies depending on conditions at the time of manufacturing. Dare to illustrate about
It is about 1.0 to 4.0 mm thick. However, the thickness of the base fabric 2 in the present invention is not limited to this range.

The plastic film 3 used in the present invention is a polyethylene film having a thickness of 40 to 60 μm, and the base fabric 2 and the plastic film 3 are linearly heat-sealed.

[0008] The breathable bag fabric of the present invention comprises a step of laminating a plastic film 3 inside a base fabric 2 made of a nonwoven fabric composed of fibers of 1.0 denier or less (preferably 0.1 denier or less). A step of heat-sealing the cloth 2 and the plastic film 3 to integrate them with each other;
and a step of piercing the fine hole 5 having a diameter m with a laser beam in the thickness direction. If the pore size of the micropores 5 is smaller than 20 μm, sufficient air permeability cannot be ensured, and if it is larger than 300 μm, fine powder put in a bag made of the bag material may leak. When the micro holes 5 are formed in the plastic film 3, the micro holes 5 are provided so that the bottoms of the micro holes 5 reach the joint portion of the base fabric 2 with the film 3.

In the present invention, the above nonwoven fabric is constituted by: 1.
The fibers having a denier of 0 or less include microfibers which are said to have a thickness one-fifth that of silk, and ultrafine or ultrafine fibers which are called hyperfibers. As the nonwoven fabric, for example, polyester and polypropylene microfibers are mixed at a predetermined ratio (for example, about 5%).
(0 wt% each) and microfiber nonwoven fabrics containing a predetermined ratio of polyester and nylon microfibers. For the reason that the former is less expensive than the latter, the former microfiber nonwoven fabric is used in the embodiments of the present invention described later, but this does not mean that the use of other nonwoven fabrics is not excluded in the present invention.

[0010]

According to the bag cloth 1 of the present invention, the base cloth 2 on the front side is made of a non-woven fabric, and the plastic film 3 bonded inside has a large number of fine holes 5 having a hole diameter of 20 to 300 μm. By being provided, the base cloth 2
The gas such as air can flow between the inside and the outside of the bag through the gap existing between the fibers and the fine holes 5 in the plastic film 3. Therefore, when a fine powder having hygroscopicity or the like is put in a bag made of the bag fabric 1 of the present invention, water vapor is absorbed by the fine powder in the bag, and the humidity outside the bag is relatively reduced. Is released from the fine powder side. Such absorption and release of water vapor are performed reversibly in accordance with the humidity and temperature of the outside air around the bag fabric. Can be absorbed, and on the other hand, it can be easily dried by blowing air when not in use.

According to the present invention, not only sufficient air permeability is ensured. The nonwoven fabric constituting the base fabric 2 is 1.0
Since each fiber element is formed by microfibers or microfibers such as microfibers of denier or less and each fiber element is intertwined with each other, despite having gaps that can ensure air permeability, those gaps Can be prevented from passing through. Therefore, even if the fine powder put in the bag is
Even if it reaches the base fabric 3 through the base material, the movement of the fine powder is prevented at that portion, so that leakage of the powder to the outside is reliably prevented.

In particular, 1.0 comprising polyethylene fibers
According to a breathable bag cloth 1 in which a base cloth 2 having a thickness of about 2.0 mm and a polyethylene film 3 having a thickness of 40 to 60 μm are linearly heat-sealed, the thickness of the whole cloth is suitable for processing. Therefore, not only processing such as cutting and sewing becomes easy, but also the affinity in the material surface of the base fabric 2 and the polyethylene film 3 and the linear heat sealing process,
The bonding state between the base fabric 2 and the polyethylene film 3 becomes more reliable and favorable.

According to the manufacturing method of the present invention, the base film 2 and the plastic film 3 are heat-sealed and integrated, and then the plastic film 3 is perforated. Compared to the case where the cloth 2 is bonded, the bonding operation can be performed quickly and favorably.

In addition, the base fabric 2 and the plastic film 3
Are integrated by heat-sealing, and a large number of fine holes having a hole diameter of 20 to 300 μm are formed in the plastic film 3 in a thickness direction through a laser beam over the entire surface of the plastic film 3. In spite of the state of being bonded to the plastic film 3, the plastic film 3 can be easily punched, and the diameter and depth of the fine hole to be processed can be easily controlled. This makes it possible to efficiently form the required number of micropores having the required pore diameters and the like.

[0015]

As described above, according to the present invention, it is possible to realize a bag material for obtaining a bag for containing fine powder, which can prevent fine powder from leaking and can sufficiently secure air permeability. . In this way, for example, a bag fabric that is optimal as a material for making bedding such as a sweat absorbing mat (pillow) or a pillow can be obtained. Further, according to the method of the present invention, it is possible to efficiently produce a bag cloth having the above-described excellent characteristics.

[0016]

FIG. 1 shows an example in which the bag fabric of the present invention is used for a bedding mat (laying cloth) having a function of absorbing sweat and odor. In FIG. 1, a bedding mat A is formed in a square bag shape in plan view using a breathable bag material 1 according to the present invention, and inside thereof is fine powdered activated carbon (in this example, coconut shell activated carbon). B is enclosed.

As shown in FIG. 2, the air-permeable bag cloth 1 used for the bedding mat A has a base cloth (thickness 1.5 mm in the illustrated example) 2 located on the outer side and an inner side inside thereof. A plastic film (a polyethylene film having a thickness of 50 μm in the illustrated example) 3 is provided, and a predetermined portion of the plastic film 3 is linearly heat-sealed with respect to the base fabric 2 so as to be bonded to each other. . In FIG. 2, the reference numeral 4 indicates the heat seal portion.

The base fabric 2 is made of a microfiber nonwoven fabric containing 50 wt% of each microfiber (thickness: 0.6 denier) made of polyethylene and polypropylene.

As shown in FIG. 3, the plastic film 3 is provided with a large number of fine holes 5 for ensuring air permeability. The diameter of these fine holes 5 is shown in FIG.
In the state of the bedding mat A, the flow of gas such as water vapor between the base cloth 1 which is to be located on both sides of the plastic film 1 and the activated carbon (accommodated on the upper side of the plastic film in FIG. 3) B On the other hand, the setting is such that activated carbon itself is hardly or not allowed to pass through. Specifically, the pore diameter in this embodiment is about 25 μm, though it depends on the particle diameter of the activated carbon B.

The above-mentioned bag fabric 1 was manufactured as follows. First, as shown in FIG. 4A, each microfiber made of polyethylene and polypropylene (having a thickness of
0.6 denier), a 1.5 mm thick base fabric 2 composed of a microfiber non-woven fabric comprising 50 wt% of each
A polyethylene film (plastic film) 3 having a thickness of 50 μm is prepared, and a polyethylene film 13 is overlaid on the upper inner surface of the base fabric 1.

Next, as shown in FIG. 4B, the laminated base fabric 2 and polyethylene film 3 are linearly heat-sealed vertically and horizontally to be integrated (see FIG. 2). In the drawing, reference numeral 4 indicates a linear heat seal portion.

Finally, as shown in FIG. 4 (c), a polyethylene film 3 is placed inside (upper side in FIG. 4)
A large number of fine holes 5 are formed in a penetrating manner over the entire surface by irradiating a laser beam. At this time, each fine hole 5 was formed such that the bottom of the hole reached the joint portion of the base fabric 2 with the film 3. The diameter of each fine hole 5 was set to 25 μm.

Thus, a sheet-like bag cloth 1 is prepared, sewn into the bag, and then filled with activated carbon B, which is a fine powder of charcoal, and a bedding mat (sheet) for sweat absorption as shown in FIG. (See FIG. 1).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mat for bedding made using the breathable bag fabric of the embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing a configuration of a breathable bag fabric according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG. 2;

FIG. 4 is a process chart showing a method for producing a breathable bag cloth according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breathable bag cloth 2 Base cloth 3 Plastic film (polyethylene film) 4 Heat seal part 5 Micropore

Claims (4)

[Claims] 1. A bag fabric for obtaining a bag for containing fine powder, wherein a plurality of pores having a pore diameter of 20 to 300 μm are formed on the inner surface of a base fabric 2 made of a nonwoven fabric composed of fibers of 1.0 denier or less. A breathable bag cloth to which a plastic film 3 having fine holes 4 provided over the entire surface is bonded. 2. The base fabric 2 includes polyethylene fibers,
^{2. The} plastic film 3 is a polyethylene film having a thickness of 40 to 60 μm, the basis weight is set to 100 to 300 g / m ² , and the base fabric 2 and the plastic film 3 are heat-sealed linearly. 3. Breathable bag fabric. 3. A bag fabric for obtaining a bag for containing fine powder, wherein a plastic film 3 is layered on the inside of a base fabric 2 made of a nonwoven fabric composed of fibers of 1.0 denier or less. A heat-sealed plastic film 3 is integrated with the plastic film 3, and a breathable bag fabric obtained by piercing the plastic film 3 with a laser beam to penetrate the fine holes 5 having a hole diameter of 20 to 300 μm in the thickness direction over the entire surface thereof. Manufacturing method. 4. The method according to claim 1, wherein when the micro holes are formed in the plastic film, each of the micro holes is provided so that the bottom of the micro holes reaches the joint portion of the base cloth with the film. Item 4. The method for producing a breathable bag cloth according to Item 3.