JPH05294382A - Bag for transportation - Google Patents

Abstract

PURPOSE:To provide a practical and durable bag for transportation of powder, liquid, etc., which has satisfactory characteristics required for a flexible sheet withstanding the discharge pressure produced when the powder, liquid, etc., transferred by a tank lorry is discharged by use of air pressure. CONSTITUTION:Stretch-breaking spun yarn composed of short fibers having 3.5 or thinner denier in the single fiber fineness, 12g/d or more in the single fiber strength, and 100-2000mm in the average fiber length is woven for a bag for transportation. The fabrics density and the whole fineness both in the longitudinal and lateral directions of the fabrics submit to the following relation. The bag for transportation is made of a sheet coated with a thermoplastic resin at least at the one side. The value of the fabrics density times the route whole fineness is within the following range. 900 > fabrics density X route whole fineness >500 (fabrics density; numbers/inch, fineness; denier).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag for carrying powder, liquid or the like, which is suitable as an airtight film material for making a tank truck flexible.

[0002]

2. Description of the Related Art Conventionally, a metal container made of steel has been mainly used for transporting powder and the like by a tank truck. This steel metal container has a capacity of 10-20m
^{3. Since} the maximum loading weight is about 10 tons and it is heavy, the load on the carrier is heavy and the container itself cannot be transported. In the case of long-distance transportation, it is uneconomical because the return route will be empty. Therefore, it has been desired to make the container itself flexible and lightweight.

Generally, powder or the like carried by a tank truck is discharged to the outside of the container by utilizing air pressure, and various characteristics required for a flexible sheet in order to withstand the discharge pressure at that time are strong ≧ 600 kg. / 3 cm, peel strength ≧ 5.5 kg / 2 cm, basis weight ≦ 1000 g / m ² ,
Sheet hardness (JIS-1096, C method, loop compression method)
≦ 700 g.

By the way, a composite cloth in which a resin is combined with a fiber is widely used in applications such as a tent, a sail cloth, a balloon, a hovercraft, a rubber boat, a flexible container, and a canoe. Flexible tank lorry sheets that satisfy the various characteristics required for seats have not yet been realized.

For example, a flexible sheet in which a resin is combined with a base fabric made of polyester filament is difficult to apply in terms of peeling strength or lightness. That is, in order for the flexible sheet in which the resin is combined with the base fabric made of polyester filament to satisfy the above required characteristics, the base fabric weight must be 900 g / m ² or more and the resin weight must be 1000 g / m ² or more. Therefore, the basis weight of the product becomes 1900 g / m ² or more, which is not practical.

The so-called canvas, which is a composite of polyester spun yarn and resin, has a satisfactory peeling strength, but in view of strength and weight, it is more flexible than a flexible sheet in which a base material made of polyester filament is combined with resin. Inferior. Alternatively, a flexible sheet in which a resin is combined with a base fabric made of aramid filament, which uses high-strength fibers, is acceptable in terms of high strength and light weight, but its adhesive strength with the resin is not sufficient, so the peel strength is low. Becomes impractical.

[0007]

OBJECTS OF THE INVENTION The object of the present invention is to solve the above problems in the prior art. That is, the object of the present invention is to provide various characteristics required for a flexible sheet in order to withstand the discharge pressure when powder or the like carried by a tank truck is discharged to the outside of the container by utilizing air pressure, and a strength ≧ 600 kg / 3 cm, peel strength ≧ 5.
5 kg / 2 cm, basis weight ≦ 1000 g / m ² , sheet hardness (JIS-L-1096, C method loop compression method) ≦ 700
It is to provide a practicable and durable carrying bag that can satisfy g and the like. It also aims to make the flexible container lighter and more workable.

[0008]

That is, according to the present invention, "(Claim 1) Single-fiber strength of 3.5 denier or less, single yarn tenacity of 12 g / d or more, and weaving a stretch-cut spun yarn composed of short fibers having an average fiber length of 100 to 2000 mm. A carrying bag characterized in that the woven density and the total fineness in the warp direction and the weft direction of the woven fabric are in the following formula, and is composed of a sheet having at least one surface coated with a thermoplastic resin.

900> weave density × root total fineness> 500
(Woven density; book / inch, fineness; denier) (Claim 2) Single yarn fineness of 3.5 denier or less, single fiber strength of 12 g / d or more, and a stretch-cut spun yarn composed of short fibers having an average fiber length of 100 to 2000 mm. A woven fabric in which the weave density and the total fineness in the warp and weft directions of the woven fabric are in the following formula, and at least one surface of which is coated with a thermoplastic resin has a fluorine resin or an acrylic resin on at least one surface. The carrying bag according to claim 1, which is coated with one resin selected from the following.

900> weave density × root total fineness> 500
(Woven density; book / inch, fineness; denier) (Claim 3) The transport bag according to Claim 1 or 2, wherein the heat shrinkage ratio of the short fibers is 1% or less at 180 ° C of dry heat. (Claim 4) A flexible container comprising the carrying bag according to any one of claims 1 to 3. (Claim 5) A flexible tank truck using the carrying bag according to any one of claims 1 to 3. (Claim 6) The flexible tank truck according to claim 5 has an air permeability of 0.01 to 0.1 cc / sec / as an inner bag.
The flexible tank truck according to claim 5, wherein at least a part of the cloth of cm 2 is used, and an air slider is provided in the lower part. (Claim 7) An air bag having an air permeability of 0.01 to 0.1 cc /
7. The flexible tank truck according to claim 6, wherein, when at least a part of the fabric of sec / cm ² is used, it is sewn at the same time as sewing with a resin film which can be heat-sealed.

Here, the single yarn fineness is 3.5 denier or less, the single fiber strength is 12 g / d or more, and the average fiber length is 100 to 2000.
The mm short fiber is, for example, an aramid fiber, a high-strength polyester fiber, a high-strength polyvinyl alcohol fiber, a high-strength polyolefin fiber, a carbon fiber, a metal fiber, an inorganic fiber, or the like, which satisfies the above-mentioned required characteristics.

The single yarn fineness is 3.5 denier or less, preferably 1.5 denier or less. If the single yarn fineness exceeds 3.5 denier, the number of single yarns in the multifilament is reduced, the exposed end yarns are reduced, and the peel strength from the resin is reduced, making it unusable.

The single fiber strength is 12 g / d or more, preferably 20 g / d or more. If the single fiber strength is less than 12 g / d, the weight of the base cloth becomes large, and the strength is high and the purpose of weight reduction cannot be achieved.

The average fiber length is 100 to 2000 mm. When the average fiber length is less than 100 mm, the strength utilization factor after weaving is lowered, and it is difficult to obtain sufficient product strength. If the average fiber length exceeds 2000 mm, the tenacity factor after weaving is high, but the number of short fiber end yarns (fluffy end yarns) exposed on the fiber surface of the stretch-cut spun yarn decreases, and Adhesive strength when combined is reduced, so sufficient peel strength cannot be obtained. In order to obtain sufficient peel strength, the number of short fiber end yarns exposed on the surface of the stretch-cut spun yarn is at least 1 /
It is desirable to use those that are present in cm, preferably 2 / cm or more.

The relationship between the weaving density and the total fineness in the warp direction and the weft direction of the woven fabric must satisfy the following formula.

900> weave density × root total fineness> 500
(Woven density: book / inch, fineness; denier) When the woven density x the total root fineness is 500 or less, it is difficult to obtain a uniform sheet property after resin processing because the weft is too wide to cause misalignment. Weave density x root total fineness is 9
If it exceeds 00, fine yarns and high weaving density may cause the single yarns to be entangled with each other, making it impossible to weave, and the ratio of the fluffy end yarns to be exposed on the surface of the base fabric is reduced, so that resin impregnation is performed. In that case, it becomes difficult to obtain the bridge effect, and thus sufficient peeling strength cannot be obtained.

A vinyl chloride resin is often used as the thermoplastic resin, but a normal canvas resin may be used.
It is not necessarily limited.

When at least one surface of the sheet of the present invention according to claim 1 is further coated with one resin selected from a fluororesin or an acrylic resin to form a carrying bag, water repellency and weather resistance are improved. ， It can be made as a highly durable carrying bag.

The short fibers used in the carrying bag of the present invention preferably have a heat shrinkage of 1% or less at a dry heat of 180 ° C. When short fibers with a heat shrinkage of 1% or less at dry heat of 180 ° C are used, the fiber shrinkage does not occur in the sheet at the processing temperature of 170-180 ° C, so the voids between the fibers become uniform, and the resin is placed in the base fabric. It can be uniformly impregnated to increase the peel strength of the sheet as a whole.

When the contents are discharged by combining the inner bag, the inner bag is made slightly smaller than the outer bag, and the upper two places of the inner bag are fixed to the outer bag and the air slider is attached to the lower part. The contents can be easily discharged by setting. The air permeability of the inner bag is 0.01-
By using a fabric of 0.1 cc / sec / cm ² for at least one part, the air pressure between the inner bag and the outer bag becomes constant, and the structure of the outer bag can be simplified.
Moreover, the contents do not leak into the outer bag.

When the inner bag is sewn, for example, by sealing it with a resin film which can be heat-sealed at 100 to 160 ° C., the contents are kept in the outer bag even when the inner bag is pressurized. Since the gas does not leak and the gas can move freely from the inner bag to the outer bag, the pressure in the inner bag and the pressure in the outer bag are constant, and no high pressure is applied to the inner bag. Then, due to the bulge of the outer bag, the inner bag is lifted up by the upper fixed portion, and becomes a V-shape with the slider portion in the lower part, so that the contents are smoothly discharged.

[0022]

The carrying bag of the present invention has various characteristics required for the flexible sheet in order to withstand the discharge pressure when the powder carried by the tank truck is discharged to the outside of the container by utilizing the air pressure. Strength ≧ 600 kg / 3 cm, peel strength ≧ 5.5 kg / 2 cm, basis weight ≦ 1000 g /
It is a practical and durable carrying bag that can satisfy m ² , sheet hardness (JIS-1096, C method loop compression method) ≦ 700 g, etc., and is a foldable and lightweight carrying bag.

The present invention will be specifically described below with reference to examples. In the examples, the strength, peel strength, sheet hardness, etc. were evaluated according to the following methods.

Strong: JIS-L-1096, 6.12
Tensile strength and elongation Peel strength: K6328.6.3.7 Peel test Sheet hardness: JIS-L-1096, 6.20.3 C
Method (11-10 compression method)

[0025]

[Example 1] Single yarn fineness 0.75 denier, single fiber strength 2
Stretch-cut spun yarn GTN20 / 2 (260 denier x2, average fluffy end yarn count 9.45 pieces / cm) made of para-aramid short fibers (Technora fiber, Teijin Ltd.) with 2 g / d and an average fiber length of 1500 mm. 2) were aligned and woven at a weaving density of 26 yarns / inch in both the warp direction and the weft direction. The obtained woven fabric was impregnated with vinyl chloride sol, and the vinyl chloride resin was calendered to obtain a flexible sheet of 960 g / m ² (technola base fabric 250 g / m ² ).
The strength of the sheet was 610 kg / 3 cm in the warp direction, 630 kg / 3 cm in the weft direction, and the peeling strength was 6 kg / 2 in the warp direction.
cm, latitudinal direction 6.3 kg / 2 cm, sheet hardness 60
It was 0 g.

[0026]

[Example 2] Single yarn fineness 0.5 denier, single fiber strength 21
g / d, using a stretch-cut spun yarn (average fluffy end yarn count of 4.72 pieces / cm) made of para-aramid short fibers (Technora fiber, Teijin Limited) having an average fiber length of 1500 mm,
It was woven at a weaving density of 55 yarns / inch in both the warp direction and the weft direction. The woven fabric thus obtained was impregnated with vinyl chloride sol, and the vinyl chloride resin was calendered to obtain a flexible sheet having a weight of 380 g / m ² (technola base fabric 90 g / m ² ). The strength of the sheet is 210 kg / 3 cm in the warp direction, 220 kg / 3 cm in the weft direction, and the peeling strength is 5.9 kg / in the warp direction.
2 cm, latitudinal direction 6.1 kg / 2 cm, sheet hardness 2
It was 10 g. When used in a flexible container for 1 ton, the total weight was 9 kg / bag and the conventional weight (22.5
It was 1/25 of that of a conventional product.

[0027]

[Comparative Example 1] Single yarn fineness 5.2 denier, single fiber strength 8.
Two 0 g / d polyester high-strength filament fibers (total fineness: 1000 denier, manufactured by Teijin Ltd.) were aligned and woven at a weaving density of 12 fibers / inch in both the warp direction and the weft direction. Polyvinyl sol (adhesive Barca Bond 1
Subjected to impregnation processing in including 0%), was obtained a flexible sheet of 1600 g / m ² (polyester base fabric 450 g / m ²⁾ was further laminated to PVC film on both sides. The strength of the sheet is 420 kg / 3 cm in the warp direction, 410 kg / 3 cm in the weft direction, and the peeling strength is 5.0 in the warp direction.
kg / 2 cm, the weft direction was 5.3 kg / 2 cm, and the sheet hardness was 750 g.

[0028]

[Comparative Example 2] Single yarn fineness 1.5 denier, single fiber strength 2
10 consisting of para-aramid short fiber (Technora fiber, manufactured by Teijin Ltd.) having 5.0 g / d and an average fiber length of 51 mm 10
/ 1 (531 denier) spun yarn (average fluffy end yarn count 2)
0.8 piece / cm) was used and two pieces were aligned and woven at a weaving density of 26 pieces / inch in both the warp direction and the weft direction. The obtained woven fabric is impregnated with vinyl chloride sol, and both sides of the woven fabric are further topped with vinyl chloride resin to obtain 1000 g / m 2.
A flexible sheet of ² (Technora base cloth 250 g / m ² ) was obtained. The strength of the sheet is 210 kg / 3 in the longitudinal direction.
cm, latitudinal direction is 220 kg / 3 cm, peel strength is 6.3 kg / 2 cm in warp direction, 6.5 kg / 2 cm in latitudinal direction,
The sheet hardness was 590 g.

[0029]

[Comparative Example 3] Single yarn fineness 1.5 denier, total fineness 1000
Denier (666 filament), single fiber strength 25.0
Para-aramid filament fiber (Technora fiber, manufactured by Teijin Limited) of g / d was used and woven at a weaving density of 26 filaments / inch in both warp and weft directions. The obtained woven cloth was impregnated with vinyl chloride sol, and both sides of the woven cloth were topped with vinyl chloride resin to obtain a flexible sheet of 1050 g / m ² (Technora base cloth 240 g / m ² ).
The strength of the sheet is 630 kg / 3 cm in the warp direction, 640 kg / 3 cm in the weft direction, and the peeling strength is 5.0 kg in the warp direction.
/ 2 cm, the weft direction was 4.8 kg / 2 cm, and the sheet hardness was 680 g.

[0030]

[Comparative Example 4] Single yarn fineness 5.2 denier, single fiber strength 8.
A 0 g / d polyester high-strength filament fiber (total fineness: 1000 denier, 192 filament, manufactured by Teijin Ltd.) was woven at a weaving density of 17 filaments / inch in both warp and weft directions. Both sides of the obtained woven fabric are topped with a vinyl chloride resin to obtain 980 g / m ² (polyester base fabric 15
A flexible sheet of 0 g / m ² ) was obtained. The strength of the sheet is 170 kg / 3 cm in the warp direction and 165 k in the weft direction.
g / 3cm, peel strength is 4.5kg / 2cm in the longitudinal direction,
The weft direction was 4.1 kg / 2 cm, and the sheet hardness was 600 g.

The obtained flexible sheet was usable for a flexible container, but was heavy and had low workability, and was not practical for a flexible tank truck.

Claims (7)

[Claims] 1. Stretch-punched spun yarn composed of short fibers having a single yarn fineness of 3.5 denier or less, a single fiber strength of 12 g / d or more, and an average fiber length of 100 to 2000 mm. 2. A carrying bag characterized in that the woven density and the total fineness in (1) have a relationship of the following formula, and is composed of a sheet having at least one surface coated with a thermoplastic resin. 900> Woven Density x Root Total Fineness> 500 (Woven Density; Book /
Inch, fineness; denier) 2. A check-punched spun yarn composed of short fibers having a single yarn fineness of 3.5 denier or less, a single fiber strength of 12 g / d or more and an average fiber length of 100 to 2000 mm, and the warp and weft directions of the woven fabric. 2. The woven density and the total fineness in the above formula have the following relationship, and at least one surface of a sheet having at least one surface coated with a thermoplastic resin is coated with one resin selected from a fluorine resin or an acrylic resin. Item 1 carrying bag. 900> Woven Density x Root Total Fineness> 500 (Woven Density; Book /
Inch, fineness; denier) 3. The carrying bag according to claim 1, wherein the heat shrinkage rate of the short fibers is 1% or less at a dry heat of 180 ° C. 4. A flexible container comprising the carrying bag according to any one of claims 1 to 3. 5. A flexible tank truck using the carrying bag according to any one of claims 1 to 3. 6. The flexible tank truck according to claim 5, wherein the inner bag has an air permeability of 0.01 to 0.1 cc / sec /
The flexible tank truck according to claim 5, wherein at least a part of the cloth of cm 2 is used, and an air slider is provided in the lower part. 7. An air bag having an air permeability of 0.01 to 0.1 cc /
7. The flexible tank truck according to claim 6, wherein, when at least a part of the fabric of sec / cm ² is used, it is sewn at the same time as sewing with a resin film which can be heat-sealed.