JPH0632358A - Grain bag - Google Patents

Abstract

PURPOSE:To obtain a grain bag light in weight and excellent in storability and shock and sliding resistance by a method wherein the bag is formed of the nonwoven fabric consisting of the thermoplastic synthetic fiber with a specific average size and having a specific weight per unit area and a number of embossed patterns on its surface. CONSTITUTION:The grain bag is formed of the nonwoven fabric consisting of a thermoplastic synthetic fiber having an average size of 1-10d and having a unit weight of 70-150g/m<2> and a number of embossed patterns on its surface. By specifying the average size and the unit weight of the thermoplastic synthetic fiber as mentioned above, the grain bag is obtained which is satisfactory in air permeability and tensile strength and hence excellent in storability and shock resistance and is increased in the surface friction coefficient by the embossed patterns provided on the surface of the nonwoven fabric and hence excellent in sliding resistance. Although the use of the thermoplastic copolymer is not specifically restricted, polyester may be used preferably and the use of the polyester kneaded with copolymerizable polymer improves the adhesion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain bag used for packaging grains such as rice and wheat, and more particularly to a grain bag made of a thermoplastic synthetic fiber nonwoven fabric.

[0002]

2. Description of the Related Art Packaging bags (rice bags) used for storing and transporting rice must mainly meet the following standards according to the provisions of the Agricultural Products Inspection Act based on the Food Control Act. (1) Storage test (storability) The quality shall not change after being stored in a room temperature warehouse for 6 months. Specifically, it must have sufficient air permeability to prevent yellowing or mold formation.

(2) Drop Test (Drop Resistance) In the case of 30 kg of rice barley, when it is repeatedly dropped 10 times from a height of 1.5 m, the rice should not leak due to tearing. (3) Sliding test (slip resistance) The rice bag is 30 ° in the longitudinal direction (longitudinal direction) and 26 ° in the lateral direction.
Do not slip off when tilted.

Rice bags currently used to satisfy the above standards include hemp bags, paper bags and resin bags. But,
Since hemp bags are easily corroded and easily invaded by microorganisms, they may endanger their storage properties, and are difficult to handle due to their large weight. is there. Although a paper bag is inexpensive, it has drawbacks such as poor breathability, susceptibility to storage due to small burst strength against falling, and easy tearing when wet with water. Further, the resin bag using so-called slit yarn does not have the drawbacks of the above-mentioned hemp bag or paper bag, but it is slippery, so there is concern about the slip-down test, and there is a drawback that there is concern about the stability when storing in multiple layers in a warehouse. is there.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grain bag which is lighter than any of the above-mentioned conventional grain bags and which has excellent storability, drop resistance and slip resistance. is there.

[0006]

Means for Solving the Problems A grain bag of the present invention which achieves the above object is made of a thermoplastic synthetic fiber having an average fineness of 1 to 10d with a basis weight of 70 to 150 g / m ² and a large number of embossed patterns on the surface. It is characterized in that the bag body is composed of a non-woven fabric formed to have. In this way, the bag body is made of a thermoplastic synthetic fiber nonwoven fabric, and by specifying the average fineness and the basis weight of the thermoplastic synthetic fiber, good air permeability and tensile strength are obtained,
It has excellent storage properties and drop resistance. Further, the embossed pattern on the surface of the non-woven fabric increases the coefficient of surface friction, and excellent slip resistance can be obtained. About the weight of grain bag, 73 (± 2) cm × 50 (± 2)
The standard size of cm is 285 g / bag for conventional hemp bags and 2 for paper bags.
Although 30 g / bag and 100 g / bag were used for the resin bag, the grain bag of the present invention enables the amount to be about 75 g / bag.

In the present invention, the bag body is composed of a nonwoven fabric of thermoplastic synthetic fiber, but the thermoplastic polymer is not particularly limited, and any of polyester, nylon, polypropylene, polyethylene and the like can be used. Among them, polyester is preferable, and the above-mentioned storage properties, drop durability and slip resistance can be most satisfied. Further, when the copolymerized polymer is used by mixing it, the adhesiveness can be improved.

The structure of the non-woven fabric is not particularly limited, but it is preferable that the non-woven fabric is composed of long fibers directly made from the melt spinning process. Specifically, the molten polymer is spun into a filament shape, stretched by a compressed air jet, and stretched and blown onto a net to form a sheet based on long fibers. This non-woven fabric contains thermoplastic synthetic fibers as a main raw material, and may be mixed with fused fibers for adhesion.

In the present invention, the thermoplastic synthetic fiber constituting the nonwoven fabric has an average fineness of 1 to 10d, preferably 2
-8d. If the average fineness is less than 1d,
When it is made into a non-woven fabric, the air permeability is lowered, and it becomes difficult to satisfy the storability defined by the standard. However, if the average fineness is larger than 10 d, the stretchability during the production of the nonwoven fabric becomes insufficient, so that the tensile strength of the nonwoven fabric decreases,
The drop resistance of the above-mentioned standard cannot be satisfied.

In the present invention, the "average fineness" is calculated as an average value of the total fineness measured for 50 fibers randomly cut from a 10 cm × 10 cm sample from a nonwoven fabric. means.
The thermoplastic synthetic fiber non-woven fabric used in the present invention has a basis weight of the thermoplastic synthetic fiber of 70 to 150 g / m ² ,
It is preferably in the range of 70 to 120 g / m ² . Also,
Under this basis weight, the thickness of the non-woven fabric is 0.30 to 0.70.
A range of mm is desirable.

If the basis weight is less than 70 g / m ^2, it becomes difficult to make the tensile strength of the non-woven fabric have the standard drop resistance even if the average fineness of the constituent fibers is 2 d or more. . In addition, the basis weight is 150 g / m ²
If it is more than the above range, the air permeability is lowered, and it becomes difficult to satisfy the standard storage property. In addition, the sewing work when sewing into a bag becomes difficult, and the lightness, which is a feature of conventional rice bags, is impaired.

Further, the embossed pattern of irregularities formed on the non-woven fabric has the effect of fusing the thermoplastic synthetic fibers together by this embossing to improve the balance between the tensile strength and tear strength of the non-woven fabric and the friction of the non-woven fabric surface. The coefficient is increased to improve the slip resistance. The uneven shape of the embossed pattern is not particularly limited, but various shapes such as a circular shape, a polygonal shape such as a triangle or a square, or a modified rhombic shape can be used as the concave shape. In addition, a specific texture pattern or the like can be added.

In order to further improve the anti-slip effect obtained from such an embossed pattern, the area occupied by the recesses of the embossed pattern in the non-woven fabric is preferably in the range of 8-40%. Since the tensile strength of the non-woven fabric having the above-mentioned constitution satisfies the drop resistance, the tensile strength per width of 5 cm should be at least 8 kg / 5 cm or more for both vertical and horizontal, and the tear strength should be at least 4 kg for both vertical and horizontal. It is desirable to do. In addition, in order to satisfy storability, JIS L
It is desirable that the air permeability according to the 1096 standard be greater than 10 cc / cm ² .

The above-described present invention can be effectively used as a bag for storing or transferring beans such as wheat, corn and soybeans, and various grains such as feed in addition to rice bags. Hereinafter, a specific description will be given with reference to the embodiments shown in the drawings. FIG. 1 shows an example of a grain bag (rice bag) of the present invention. In FIG. 1, the bag body 1 is sewn from a long-fiber nonwoven fabric 2 of thermoplastic synthetic fiber. Sewing is sewing,
Either hand-sewn is acceptable. Alternatively, fusion processing such as high frequency fusion can be performed. As described above, the long-fiber nonwoven fabric 2 is made of thermoplastic synthetic fiber having an average fineness of 1 to 10 d and a basis weight of 7
The embossed pattern 3 having a large number of irregularities as shown in FIG. 2 is formed on the entire surface of the embossed pattern 3 having a thickness of 0 to 150 g / m ² .

The long-fiber non-woven fabric 2 can be directly manufactured by a manufacturing apparatus as shown in FIG. 3, for example. In FIG. 3, 31 is a melt spinning machine of a thermoplastic polymer, 32 is a duct provided under the spinneret of this melt spinning machine 31, and compressed air is blown from a supply pipe 33. The molten filament F spun from the melt spinning machine 31 is jetted from the outlet of the duct 32 together with the compressed air onto the lower net conveyor 34, and is deposited and fused to form a sheet S. The sheet S thus formed is then subjected to a pair of heated embossing rollers 3
The fibers are further nipped and embossed with each other, and the fibers are further fused to each other, and an embossed pattern is formed on the surface to form the long fiber nonwoven fabric 2. The obtained long fiber nonwoven fabric 2 is finally wound up by the winding device 36.

[0016]

[Example] Using polyester polymer pellets as a raw material,
After manufacturing eight kinds of embossed non-woven fabrics having the specifications shown in Table 1 by a non-woven fabric manufacturing apparatus as shown in Fig. 3, these are further sewn by a sewing machine to obtain 77cm x 50cm.
Processed into a rice bag. Rice bags of non-woven fabric Nos. 2 to 7 correspond to the present invention, and rice bags of non-woven fabric Nos. 1 and 7 correspond to comparative examples.

About these rice bags, 30 kg of rice each
And was subjected to a storage test (storage property), a drop test (falling durability) and a sliding test (sliding resistance) under the following conditions, and the results shown in Table 1 were obtained. Storage test After loading on a pallet and storing in a room temperature warehouse for 6 months from April to October, the presence or absence of yellowing or mold was examined.

Drop Test The presence or absence of rupture when dropped horizontally from the height of 1.5 m onto the concrete floor 10 times was examined. Sliding test Two layers are stacked on a wooden pallet, vertical direction 30 °, horizontal direction 2
The presence or absence of slippage when tilted at 6 ° was examined.

[0019]

[Table 1] The non-woven fabric No. 1 rice bag ruptured in the second drop test. It shows that when the basis weight is 70 g / m ² , sufficient tear strength cannot be obtained. In addition, non-woven fabric No. 8 rice bag was found to have mold, and even if the weight per unit area was increased to more than 150 g / m ² , the breathability deteriorated (10 cc or less), and the storage property was not satisfied. I understand.

[0020]

As described above, since the grain bag of the present invention is composed of the nonwoven fabric of the thermoplastic synthetic fiber having the specific average fineness and the specific weight of the bag body, it is lighter than the conventional rice bag and has an appropriate weight. Since it has air permeability, tensile strength, and tear strength, it is possible to satisfy excellent storage properties and drop resistance.

[Brief description of drawings]

FIG. 1 is a perspective view of a grain bag according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of the grain bag.

FIG. 3 is a schematic view showing an example of an apparatus for producing a nonwoven fabric used for the grain bag of the present invention.

[Explanation of symbols]

 1 bag body 2 non-woven fabric 3 embossed pattern

Claims (1)

[Claims] 1. A grain bag comprising a bag body made of a thermoplastic synthetic fiber having an average fineness of 1 to 10 d, a basis weight of 70 to 150 g / m ² , and a nonwoven fabric formed to have a large number of embossed patterns on the surface.