JPH0532445Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a valve bag, and more specifically, a flat cylindrical valve that can be closed by heat sealing is inserted and pasted into the body part of a cylindrical body. This invention relates to improvement of a valve bag with a mouth formed therein.

[Conventional technology]

An opening is provided in the upper part of the body patch of the one-layer or multiple-layer cylindrical body, and a flat cylindrical valve with hot-melt adhesive applied to the inner surface of one wall so that it can be sealed by heat sealing is inserted into the opening. Insert and paste so that the adhesive application surface is located on the outside of the cylindrical body, one opening end on the injection port side protrudes outward from the body patch part of the cylindrical body, and the other opening end opens inside the bag. The valve bag, which is made by folding the upper and lower ends and attaching it to the wall of a cylindrical body and closing it, is commonly called a ``sol bag'' and is used for packaging fine powders, etc. However, its structure, particularly the structure of the valve port, is disclosed in Japanese Utility Model Application No. 59-28044.

[Problem that the invention attempts to solve]

The valve bag disclosed in the above-mentioned Japanese Utility Model Publication No. 59-28044 has a flat cylindrical valve after being filled with the contents.
The opening of the body patch, including the part that protrudes outside the bag, is heated and pressurized to seal it by heat sealing. At that time, a thin line is formed on the inner surface near the fold line on both sides of the flat cylindrical valve. Pores tend to form, and the problem often arises that the fine powder content leaks through these holes.

This is because due to the curvature of the folds of the thick paper that makes up the flat cylindrical valve, so-called floating occurs near the edges of the fold lines on both sides, making it difficult to fit tightly together. This is due to the fact that fine powder from the contents tends to accumulate in the vicinity of the container, and this is difficult to remove even when air is blown by the air cleaner of the filling device, interfering with heat sealing.

The present invention has been made to solve these drawbacks, and its purpose is to provide a "sole bag" type valve bag that can be reliably sealed by heat sealing.

[Means for solving problems]

The valve bag of the present invention which achieves the above object has an opening in the upper part of the body pasting part of the one-layer or multi-layer cylindrical body, and a separate flat cylindrical valve is inserted and pasted into the opening. In a valve bag which serves as a valve opening and is closed by bending the upper and lower ends and pasting it on the wall surface of the cylindrical body, hot melt is applied to at least one side of the outermost layer of the body pasting area of the opening part along the outer edge of the body pasting part. Adhesive was applied to the cylindrical valve, one open end of which protruded into the bag, and the other open end on the side of the injection port coated with hot melt adhesive at the opening of the body pasting section. It is characterized in that it is attached at a position closer to the inside of the bag than the outer end of the body attachment part.

[Effect]

An opening is provided in the upper part of the body patch of the one-layer or multiple-layer cylindrical body, and a separate flat cylindrical valve is inserted into the opening.
In a valve bag with a configuration in which the valve opening is made by pasting the valve, the upper and lower ends are bent and attached to the wall surface of the cylindrical body to close the bag. In contrast, in this invention, the opening end on the inlet side does not protrude outside the bag of the body patch of the outermost layer, but it is placed closer to the inside of the bag than the outer edge of the body patch. In contrast to conventional bags, in which a hot melt adhesive is applied to the inner surface of the cylindrical valve and the bag itself is sealed by heat-sealing after filling the contents, in the present invention, the cylindrical valve is directly heat-sealed. For this reason, by affixing the inlet side opening end to the part of the body affixing area coated with hot melt adhesive as shown in the above structure, the fine powder can be prevented from folding into the cylindrical valve during filling. This achieves the effect of avoiding accumulation in the line of sight and sealing it.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5, but the present invention is not limited thereto.

Figures 1 to 3 show two embodiments of the present invention.
1 is a partial perspective view showing the mouth end of the valve bag of the first layer;
For convenience of explanation, the figure shows a state in which a part of the outer layer is broken and opened along the outer edge of the body patch, Figure 2 is an external view of the rear wall (the wall with the body patch), and Figure 3 2 shows the external view of the front wall (the wall without the body panel). Also, Fig. 4 and Fig. 5 are respectively A of Fig. 2.
It is a partially enlarged cross-sectional view along the -A' line and the BB' line. Therefore, the opening end on the inlet side of the flat cylindrical valve shown in FIG. 1 does not protrude outside the bag in FIG. 2.

In addition, in Fig. 1, the opening end of the flat cylindrical valve on the inlet side is located closer to the inside of the bag than the outer end of the body patch (indicated by the dotted line), which is the main part of the present invention, and the outermost layer of the body at the opening is located. The configuration is shown in which hot melt adhesive is applied along the outer edge of the body pasting part of the pasting allowance, and the body glue of the outer layer and the inner layer is omitted.

In the figure, symbol 1 is the cylindrical body, 2 is the body patch, 3 is the opening of the body patch, 4 is the flat cylindrical valve, 4a is one opening end of the flat cylindrical valve, and 4b is the other injection port. side opening end,
4c is an adhesive for pasting the flat cylindrical valve 4 (see Figure 4), 5 is a bent adhesive part for closing the upper end (see Figure 3), 6 is an outer layer, and 6a is a body of the outer layer. Postage,
6b is the outer layer body glue, 7 is the inner layer, 7a is the inner layer body glue, 7b is the inner layer body glue, and 8 is the hot melt adhesive.

In the valve bag of this embodiment, an opening 3 is provided in the body pasting part 2 of the cylindrical body 1, and a body pasting allowance 6 of the outer layer 6 of the opening 3 is provided.
At least on one side along the outer edge of the body patch part a, a strip is formed with a length corresponding to the dimension of the opening 3, that is, a width smaller than the width of the body patch allowance 6a as shown in FIGS. 1 and 4. While applying the hot melt adhesive 8 by P, one open end 4a of the flat cylindrical valve 4 protrudes into the bag, and the other open end 4b on the inlet side is positioned closer to the inside of the bag than the outer end of the body patch. At the outer layer body pasting allowance 6a of the opening 3 of the body pasting part 2, in other words, as shown in FIG. The adhesive 4c is applied, the upper and lower ends of the cylindrical body 1 are bent, and the cylindrical body 1 is pasted 5 on the wall surface of the cylindrical body 1.

Note that although FIGS. 1 to 5 illustrate a pleated two-layer bag, the number of layers of the bag and the presence or absence of pleats are not limited thereto. The upper and lower ends can be closed using the pinch method (see Figure 6), which involves bending the ends and attaching them to the wall of the cylindrical body, and the double-fold method (see Figure 7).
(see figure) etc. are used. That is, as shown in FIG. 6, the end of the cylindrical body 21 is cut stepwise to form a flap 22 on one wall 21a, and the flap is cut along the bending line D-D'. other wall 2
The so-called "pinch method" in which the ends are closed by bending and pasting them on the top of the cylindrical body 31, or the both ends of the multi-layered cylindrical body 31 whose ends are cut in a straight line as shown in FIG. Along the edge, a notch 32 is made in at least the outermost layer, and one wall 33 of the outer layer with the notch is left, and the other part is completely folded to a width corresponding to the depth of the notch. bending, and further the outer layer wall 33 and the bent portion 3
4 may be folded along the edge 34a of the bent portion 34 and then attached to the wall surface of the cylindrical body 31 to close it, a so-called "double fold type".

After the valve bag of this embodiment is filled with the contents, the outermost layer of the body adhesive 6a is heated and pressurized at the opening 3 of the body adhesive part 2, so that the inner surface of the body adhesive 6a is coated. The hot melt adhesive 8 melts and seals the opening 3 so as to surround the open end 4b of the flat cylindrical valve 4 in a U-shape.

[Effect of idea]

As described above, in the valve bag of the present invention, after filling the bag with contents, the outermost layer of the bag 6a can be sealed by heating and pressurizing the opening 3 of the bag 2. . That is, the outermost layer of the body adhesive 6a is attached to the open end 4 of the flat cylindrical valve 4 by the hot melt adhesive 8 applied to its inner surface.
It is attached so as to surround b in a U-shape. That is, the flat cylindrical valve 4 does not participate in sealing, and therefore,
Neither the curvature of the thick paper near the fold lines on both sides inside the flat cylindrical valve 4 nor the accumulation of fine powder will impair the sealing performance. In addition, in the valve bag of the present invention, the fine powder adhering to the outermost layer body lining 6a during filling can be easily removed from the area involved in sealing the bag by blowing air with the air cleaner of the filling device. Can be done.

As detailed above, according to the present invention, it is possible to provide an improved "sole bag" type valve bag that can be reliably sealed by heat sealing.

[Brief explanation of the drawing]

1 to 3 are partial perspective views showing the mouth end of a two-layer valve bag according to an embodiment of the present invention, and FIG. 1 shows a part of the outer layer cut away along the outer edge of the body patch. Drawings showing the opened state, Figure 2 is an external view of the wall side without the body sticking part, Figure 3 is an external view of the wall side without the body sticking part, and Figures 4 and 5 are 2 are partially enlarged cross-sectional views taken along lines A-A' and B-B' in FIG. 2, respectively. 6 and 7 are drawings showing the means for closing the upper and lower ends of the valve bag of the present invention, A and B in Fig. 6 are drawings of the pinch method process, and A, B and B in Fig. C shows a drawing of the process using the double fold method. In the figure, 1... cylindrical body, 2... body patch, 3... opening of body patch, 4... flat cylindrical valve, 4a... one opening end of flat cylindrical valve 4, 4b... ...Opening end on the inlet side of the flat cylindrical valve 4, 4c...Adhesive for pasting the flat cylindrical valve 4, 5...Bending sticking part for closing the upper end, 6...Outer layer, 6a ...Outer layer body gluing allowance, 6b
...Outer layer body glue, 7...Inner layer, 7a...Inner layer body pasting allowance, 7b...Inner layer body glue, 8...Hot melt adhesive, 21...Cylindrical body, 21a...Cylindrical body 21
one wall of the cylindrical body 21, 21b...the other wall of the cylindrical body 21,
22...Flap formed on the wall of 21a, 31
. . . cylindrical body, 32 .

Claims (1)

[Scope of utility model registration request] An opening is provided in the upper part of the body patch of the one-layer or multiple-layer cylindrical body, and a separate flat cylindrical valve is inserted into the opening.
In a valve bag whose upper and lower ends are bent and pasted to the wall surface of the cylindrical body to form a valve opening and then closed, at least the outer end of the body adhesive part of the outermost layer of the opening. Hot melt adhesive is applied to one side along the cylindrical valve, and one open end of the cylindrical valve projects into the bag, and the other open end on the side of the inlet is attached to the hot melt adhesive of the opening of the body pasting section. 1. A valve bag characterized in that the adhesive is applied to a portion where an adhesive is applied and is located closer to the inside of the bag than the outer end of the body pasting part.