JPH0620249U - Multi-layer bag - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a double-fold sealed multi-layered bag capable of preventing the contents from remaining in the sealed part of the double-folded sealed multi-layered bag. [Structure] At least the outermost layer except at least the innermost layer of the linearly or stepwise cut end of the multilayer tubular body 2 in which at least one of the both ends of the mouth bottom is cut straightly or stepwise. Along the fold lines on both sides, a notch 8 reaching the first fold line 4 parallel to the cutting line is provided to form a closing flap 6, and the closing flap 6 is formed inside the innermost layer of the end portion in a region within the width of the fold portion. A hot-melt adhesive is applied, the other part is folded inward along the first folding line 4 leaving the closing flap 6, and the closing flap 6 and the bent part are second-folded. A double-fold type sealed multi-layer bag formed by bending along the line 5 and adhering and sealing the closing flap 6 on the bag body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-layer bag, and more particularly to an improved multi-layer bag which is sealed in a double fold type.

[0002]

[Prior art]

 A multilayer bag in which at least one of the both ends of the mouth bottom is linearly cut and the linearly cut end is sealed in a double-fold type is disclosed in Japanese Utility Model Publication No. 61-186541. ing. The double-fold type bag made by filling and sealing the contents, when the contents are taken out after opening the bag, the contents move and wrap around the sealing part during storage, cargo handling, transportation, etc. and remain. In addition, it was sometimes difficult to discard the empty bag after that.

The device disclosed in Japanese Utility Model Publication No. 61-186541 will be described with reference to FIG. FIG. 5 is a longitudinal view of a sealing portion of a two-layer tubular body in which one end is linearly cut in order to explain the invention described in the above publication according to FIG. 2 based on its manufacturing processes A, B and C. FIG. 6 is a conceptual view showing a cross section in the direction of FIG. 5, where reference numeral 1 is a two-layer tubular body, 2 is an outer-layer tubular body, 3 is an inner-layer tubular body, and 4 is parallel to a linear cutting line. The first bending line, 5 is the second bending line, 6 is the closing flap portion, 12 is the adhesive that attaches the inner surface of the outer layer 2 and the outer surface of the inner layer 3 at a portion thereof, and 13 is the bending portion. Indicates an adhesive.

FIG. 5A shows a state in which a cut is made along both side folding lines of the outer layer tubular body 2 up to the first folding line 4, and FIG. 5B shows the inner layer 3 and the upper outer layer 2 with flaps. The first fold line 4 is left inward, leaving the part 6, and then the second fold line 5 in FIG. 5C shows that the flap part is also fold inward. Adhesive 13 is attached to one side and sealed.

Since the bag body of this shape is composed of a straight-cut tubular body, it is easy to perform the work in the tube-making process, and the inner layer is closed in a folded state twice, and as described above, the outer layer is closed. Since the inner layer and the inner layer are attached in advance, it has excellent sealing strength and can prevent leakage of contents.

[0006]

[Problems to be solved by the device]

 However, in the above-mentioned multi-layer bag, the contents move inside the bag during storage, cargo handling, transportation, etc., and slightly wrap around the sealing part, and the contents remain in the sealing part even after taking out the contents. There was a problem.

An object of the present invention is to provide a double-fold type sealed multi-layer bag capable of remarkably reducing the content remaining in the sealing part, which is a problem of the above-mentioned conventional technique.

[0008]

[Means for Solving the Problems]

 The double-fold type sealed multi-layer bag of the present invention which achieves the above-mentioned object is at least the innermost layer of the linearly cut end of the multilayer tubular body in which at least one end is linearly cut out of both ends of the mouth bottom. Except for the above, at least along both side fold lines of the outermost layer, a notch reaching the first fold line parallel to the linear cut line is provided to form a closing flap, and the width of the fold portion is formed inside the innermost layer of the end. Apply hot-melt adhesive to the inner area and fold the other part inward along the first fold line, leaving the closure flap, and then further close the closure flap part and the bent part, By bending along the second folding line, the closing flap portion is attached and sealed to the bag body.

The double-fold type sealed multi-layer bag of the present invention which achieves the above-mentioned object has at least one end of the multi-layered cylindrical body in which at least one end is stepped out of both ends of the mouth bottom. Except for the innermost layer, at least along both side fold lines of the outermost layer, a notch reaching the first fold line parallel to the step cutting line is provided to form a closing flap, and a fold portion is formed inside the innermost layer at the end. Apply hot-melt adhesive to the area within the width of, and fold the other part inward along the first fold line, leaving the closing flap, and further, the closing flap part and the bent part. Is folded along the second folding line, and the closing flap portion is attached and sealed to the bag body.

[0010]

[Action]

 In the present invention, when the end portion of the multi-layer bag is sealed by the double-fold method, the structure in which the hot melt adhesive is applied to the innermost layer of the bent portion significantly reduces the content remaining in the sealing portion. be able to.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view for explaining the invention of claim 1 based on the manufacturing process, wherein reference numeral 1 is a two-layer tubular body, 2 is an outer-layer tubular body, 3 is an inner-layer tubular body, 4 is a first fold line, 5 is a second fold line which is the closing flap 6 and the other part is inwardly bent along the first fold line and the tip 9 of the part, 6 is a closing flap, Reference numeral 7 indicates a double-sided fold line of the outer layer, and 8 indicates a notch. Further, A, B and C in FIG. 2 are enlarged sectional views taken along the line XX ′ corresponding to A, B and C in FIG. 1, and are conceptual views showing the manufacturing process of the sealing portion.

First, in A of FIG. 1 and A of FIG. 2, the hot melt adhesive 10 is applied to the inside of the innermost layer at the bottom end portion in the region within the width of the bent portion up to the second bending line 5. Along the outer double-sided fold lines 7, a cut 8 reaching the first fold line 4 is made in the tubular body 2 of the outer layer, and then the closing flap part 6 is left, and the other parts are laid along the first fold line 4. Bending inward (see B in FIG. 1 and B in FIG. 2), and further, the closing flap portion 6 and the portion folded along the first folding line 4 are connected to the tip 9 of the folded portion ( (See FIG. 2B) That is, after folding inward along the second folding line 5, the closing flap portion 6 is attached to the inner outer wall of the bag main body, whereby the double inventor according to claim 1 is formed. Fold-type sealed multi-layer bag (C in Figure 1, C in Figure 2) Obtainable.

Next, the invention of claim 2 will be described with reference to FIGS. 3 and 4. 3 and 4 are a perspective view and a cross-sectional view of the sealing portion for explaining the invention of claim 2 according to the manufacturing process thereof, and A, B and C of FIG. 4 are A, B and C of FIG. FIG. 5 is an enlarged cross-sectional view taken along line XX ′ of FIG. 3 and is a conceptual diagram showing the manufacturing process of the sealing part, and in FIGS. 3 and 4, the same reference numerals as those in FIGS. 1 and 2 have the same meanings, 9 indicates the tip of the bent portion. 3 and 4, it is the same as that shown in FIGS. 1 and 2 except that one end of the multilayer tubular body 1 is not linear but is cut stepwise.

First, in A of FIG. 3 and A of FIG. 4, the hot melt adhesive 10 is applied to the inside of the innermost layer at the bottom end portion in the region within the width of the bent portion up to the second folding line 5. Along the outer fold lines 7 on both sides, a notch 8 reaching the first fold line 4 is formed in the cylindrical body 2 of the outer layer to form a closing flap 6, and then the closing flap portion 6 is left and the other portions are formed as described above. Bending inward along the first folding line (see B in FIG. 3 and B in FIG. 4), and further, the closing flap portion 6 and the portion folded along the first folding line, The inward folding along the second folding line 5 along the tip 9 (see FIG. 4B) of the sheet and attaching the closing flap portion 6 on the inner outer wall of the bag body. Invented double-fold type sealed multi-layer bag (C in FIG. 3, C in FIG. 4) can be obtained.

In the above description, the pleated multi-layer bag has been described, but an ordinary multi-layer bag without folds can be similarly sealed.

[0016]

[Effect of device]

 In the present invention, since the double-fold type sealed multi-layer bag in which the hot melt adhesive is applied inside the innermost layer of the sealing part, it is possible to prevent the contents from remaining in the sealing part.

[Brief description of drawings]

FIG. 1 is a view for explaining a manufacturing process of a multi-layer bag according to a first aspect of the present invention, in which a linearly cut end is sealed, and A, B and C are perspective views.

FIG. 2 is a view showing an X- of a sealed portion corresponding to A, B and C in FIG.
A conceptual sectional view taken along the line X '.

FIG. 3 is a view for explaining a manufacturing process of the multi-layer bag according to the invention of claim 2 in which the stair cut end is sealed,
B and C are perspective views.

FIG. 4 is an X- of a sealed portion corresponding to A, B and C in FIG.
A conceptual sectional view taken along the line X '.

FIG. 5 is a view for explaining a manufacturing process of a conventional double-fold type sealed multi-layer bag, and is A, B and C of FIG.
A, B, and C which are compared with the sectional view of FIG.

[Explanation of symbols]

1: two-layer tubular body, 2: outer layer tubular body, 3: inner layer tubular body,
4: First fold line, 5: Second fold line, 6: Closing flap, 7: Fold lines on both sides of outer layer, 8: Notch, 9:
Tip of bent portion, 10: hot melt adhesive, 1
1: Sealing adhesive, 12: Inner layer adhesive, 13: Sealing adhesive

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[Procedure amendment]

[Submission date] October 8, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (2)

[Scope of utility model registration request] 1. At least the innermost layer of the linearly cut end of a multilayer tubular body obtained by linearly cutting at least one of the both ends of the mouth bottom, at least along the fold lines on both sides of the outermost layer. To form a closing flap by providing a notch reaching a first folding line parallel to the straight cutting line, and applying a hot melt adhesive to the inside of the innermost layer of the end portion in an area within the width of the folding portion. And fold the other part inward along the first fold line leaving the closing flap, and further fold the closing flap part and the bent part along the second fold line to close the fold. Double fold type sealed multi-layer bag made by sticking and sealing the flap part to the bag body. 2. Out of both ends of the mouth bottom, at least the innermost layer of at least the innermost layer of the stepped end of the multilayer cylindrical body in which at least one end is stepped, except for at least the outermost layer, Forming a closing flap by providing a notch reaching a first bending line parallel to the staircase cutting line, and applying a hot melt adhesive to an area within the width of the bending portion inside the innermost layer of the end portion, The other part is folded inward along the first folding line leaving the closing flap, and the closing flap part and the folded part are further folded along the second folding line to form the closing flap. A double-fold sealed multi-layer bag that is made by attaching and sealing the part to the bag body.