JP2002326640A - Flat bag bottomed at both ends using valve extending breadthwise - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesiveness and flexibility for a multilayer bag bottomed at both ends for packaging powder by a method wherein a valve extending to a side opposite to a blowing-in side is used at a part constituting the blowing-in side in the breadthwise direction of the bag. SOLUTION: The multilayer bag bottomed at both ends for packaging powder is in a structure wherein a rectangular opening portion is formed by bending one side at the blowing-in side of a paper case inwardly at a first crease being in parallel with an end line at the end of the blowing-in side with triangular folding parts formed at both corners, one sheet of valve 10 is stuck, extending from an area overlapping the bottom end portion to the triangular folding part at the opposite side, both sides at the end of the opening portion are bent one by one outwardly along a pair of second creases being in parallel with the end line, and a pair of folded trapezoidal portions are stuck one by one with paste. The valve 10 extending in the breadthwise direction of the bag to the side opposite to the blowing-in side is used for preventing leakage from occurring at the first and second creases at the side opposite to the blowing-in side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pleated double-bottomed bag without leakage of filling material.

[0002] More specifically, the present invention relates to a paper bag for packaging powders such as flour, carbon black, cement, corn starch, and vinyl chloride resin.

[0003]

2. Description of the Related Art JIS Z1532 "General Rules for Pasted Kraft Paper Bags" stipulates common items such as types, tolerances, structures, materials, and test methods of pasted kraft paper bags used for heavy packaging.

A glued kraft paper bag specified in JIS Z1532, and kraft paper, polyethylene processed paper, and polyethylene film are widely used as materials. Above all, those using only kraft paper as a material and adopting a valve type as a filling port type are widely used as paper bags for filling powder or translucent material.

[0005] This has the advantage that if only kraft paper is used as the material, the paper bag from which the filler has been removed can be reused as a raw material for recycled paper. This has the advantage that, even if powder or fine particles are filled as a filler, there is no need to perform any special treatment to close the filling port after filling. Among them, those using a reinforcing valve as the type of valve are economical because not only the amount of kraft paper used for the valve is small but also the amount of adhesive used to adhere and fix the valve to the paper bag is small, so it is the most widely used It is used. Hereinafter, the term “valve” refers to a reinforcing valve. However, in order to further reduce the leakage on the injection side having the filling port, the drawings in Japanese Patent Application No. 11-234460 and Japanese Patent Application
As disclosed in JP-A-29152 and JP-A-11-49184, a complicated double-bottomed bag has been proposed. However, there has been a problem that, due to the complication, the blow-side bottom becomes hard and a defect that makes it difficult to fill the contents occurs.

[0006]

By adding a reinforcement valve, an inner valve type sleeve valve and an inner patch,
Although the leakage is reduced, the layer structure becomes complicated as compared with the ordinary multi-layered double-bottomed bag, the productivity is reduced, and the blowing side, that is, the reinforced portion tends to be hardened. Therefore, there is a problem that handling at the time of filling is deteriorated. An object of the present invention is to provide a multilayer double-bottomed bag for powder filling that is easy to handle.

[0007]

Means for Solving the Problems One side of the blowing side end of the paper cylinder is formed into a valley along a first fold line of the blowing side end while forming triangular folds at both corners. A single side valve is attached from the region overlapping the bottom end to the end line of the triangular folded portion on the opposite side, and a mountain fold is sequentially formed along the second fold line of the blow side end. And
A multilayered double bottomed bag for powder packaging, in which the folded pair of trapezoidal parts are pasted in order with glue, characterized by a valve extending in the bag width direction to the side opposite to the blowing side. The object of the present invention has been achieved by a bottom bag.

[0008]

According to the first aspect of the present invention, there is provided a double-layered bag for powder packaging, wherein the bottom portion has no overlap with the conventional structure, can be easily manufactured, and is easy to handle. It becomes a formula double bottomed bag. In the above paper bag, a fold line is formed along the first fold line and the second fold line in the triangular folded portion. Therefore, the fine powder tends to leak from the leak path formed along the first fold line and the second fold line.
However, in the paper bag of the present invention, since the blowing side leakage path is closed by the valve extended in the bag width direction, leakage can be almost certainly prevented. In addition, leakage can be prevented by applying a hot-melt adhesive to decorative paper on the blowing side and heat sealing after filling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paper bag for a powder wrapping paper of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a multilayer double-bottomed bag according to the present invention, and is a developed dimensional diagram relating to a valve which is extended in a bag width direction to the side opposite to the blowing side. FIG. 1 shows the back of the double-bottomed bag of the present invention,
It is the figure seen through from the top, and the dotted line has shown the hidden line.
This double-bottomed bag has an opening side having cut tape and decorative paper, a valve extended in the width direction of the bag to the opposite side of the blowing side, and a blowing side incorporating a decorative paper coated with a hot melt adhesive at one end. It is a multi-layer double bottomed bag. As shown in FIG. 1, this is a double-bottomed bag in which a valve and decorative paper are sequentially pasted with glue on the valve side on the blowing side. The valve extended to the side opposite to the blowing side has both ends bent, so that the area of the valve is larger than that of the conventional valve and occupies most of the bottom forming portion. A conventionally known rectangular decorative paper may be further adhered to the surface of the obtained bottom end.

In the paper bag obtained as described above, the leakage path formed along the first fold line and the second fold line is sealed by the valve 10 extending to the opposite side of the blowing side. Leakage of the filled powder is prevented. Filling the paper bag with powder, heat sealing the hot melt adhesive applied to the decorative paper, and sealing the mouth, as it is flexible like a conventional double-sided bottom bag using a reinforcing valve, Easy to seal and handle well.

[0011]

EXAMPLES Two layers of kraft base paper of 84 g / m2 were set on a cylinder making machine to obtain tubes for both bottom burr bags. Next, a two-layer double-bottomed kraft paper bag was prepared by the following process using a bottommer. Specifically, by forming one side of the blowing-side end of the paper cylinder along a first fold line parallel to the end line of the blowing-side end while forming triangular folds at both corners. Forming a rectangular blowing side, pasting a valve extending from the area overlapping the bottom end to the end line of the opposite triangular fold in the bag width direction to the opposite side of the blowing side, A two-layer double-bottomed bag for powder packaging in which a pair of trapezoidal portions that have been folded in a row along the second folding line at the end, and the folded pair of trapezoidal portions are sequentially pasted with glue, is 84 g / m2. A two-layer double-bottomed sack made from a kraft base paper extended valve and decorative paper coated with hot-melt adhesive at the end, resulting in a flexible, firm blow-side end with less leakage was gotten.

[Comparative Example] Using a kraft base paper of the same 84 g / m2 as the outer layer, a reinforcing valve and a double-layered double-bottomed bag using decorative paper coated with a hot melt adhesive at the end in the same process as in the example. Created. As a result, although it was flexible, powder leakage was apt to occur, and only the blow-side end which had a practical problem could be manufactured.

[0012]

[Brief description of the drawings]

FIG. 1 is a development view showing one embodiment of a paper bag of the present invention.

[Explanation of symbols]

 1 Finished paper bag length 2 Body width 3 Opening side bottom width 4 Blowing side bottom width 5 Opening side decorative paper length 6 Blowing side decorative paper length 7 Opening side decorative paper width 8 Blowing side decorative paper width 9 Cut tape 10 Extend to opposite blowing side Valve 11 Reinforced valve width 12 Reinforced valve length 13 Hot melt adhesive

Claims (1)

[Claims] 1. A rectangular shape formed by folding one side of an open end of a paper cylinder along a first fold line parallel to an end line of an open end while forming triangular folds at both corners. Is formed, and one reinforcing valve is attached from a region overlapping with the bottom end to an end line of the triangular folded portion on the opposite side, and a pair of second ends parallel to the end line on both surfaces of the opening end. A multilayer double-bottomed kraft paper bag for powder packaging in which a pair of trapezoidal portions that have been folded in a row along the folding line and pasted back together with glue in order are opposite to the blowing side in the bag width direction. Using a valve extended to
Multi-layered double-bottomed sack that is characterized by preventing leakage of broken lines.