JP2002067192A - Edge protecting processing method for paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edge protecting processing method for a paper container for liquid, preventing a pinhole or crack easy to generate at the bending position of an edge protecting processed part and improving the accuracy of a bending dimension. SOLUTION: In producing the paper container for liquid by folding a blank comprising a synthetic resin layer of which the outermost and innermost layers can be thermally fused, the innermost layer is pressed to the bending position of the end edge part, to which edge protecting processing 40 is applied, of the blank 100 by a pressure roller 310 to cut a bending groove 42 in the synthetic resin layer from the outermost layer by the milling 330 of a projected blade, and the innermost layer of the blank is pressed by a press plate 34 to cut off the end edge part in a semicircular shape from the outermost layer by a belt knife 350, and the blank is bent from the bending groove and the outermost layer of the edge peripheral part of the cut-off surface of the blank is thermally melted by a burner 380 and inserted in a folding fixture 390 to bond the leading end of the bent part to the outermost layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to alcoholic beverages, fruit juice beverages,
The present invention relates to an edge protection method for a liquid paper container used for liquid contents such as edible oil, softener, and motor oil.

[0002]

2. Description of the Related Art Conventionally, liquid paper containers have been used for sake, wine,
It is widely used in a wide range of applications, such as fruit beverages, edible oils, and other non-food contents such as motor oils, softeners, and shampoos that require long-term storage. It has become. This liquid paper container is obtained by folding a blank formed of a printed / punched intermediate layer composed of, for example, an outermost layer of polyethylene / a synthetic resin layer mainly composed of a paper layer and a barrier layer / an innermost layer of polyethylene. The polyethylene layer is heat-sealed to make a box. As shown in FIG. 6, a cut section of the blank intermediate layer (101) is provided on the backside sealing portion and the bottom sealing portion inside the container. 105), there is a risk that the contents will penetrate from the cross section and damage the container, or foreign matter may enter the contents from the blank. Therefore, as shown in FIG. The innermost layer (102) of the synthetic resin has been subjected to an edge protection process (40) covering the cut section of the intermediate layer (101) of the blank. In this edge protection processing, half of the thickness of the blank edge is cut off from the outermost layer side of a heat-fusible synthetic resin such as polyethylene, and it is folded back from the center position in the width direction of this cut portion to the cut surface side. The cut section was covered with an innermost layer of a heat-sealable synthetic resin of polyethylene, and the folded surface side was heat-sealed and bonded. As a processing method of the edge protection, a cutting milling method or a cutting bell knife method has been used. Cutting milling method
First, as shown in FIG. 7B, the surface of the innermost layer of the heat-sealable synthetic resin at the edge of the blank (100) shown in FIG. ), Half of the thickness of the heat-sealable synthetic resin is cut off from the outermost layer side by a flat blade milling (320), and then, as shown in FIG. 7 (c), the surface of the innermost layer While pressing with a pressing roller (310), a bending groove (42) is cut at a predetermined position on the shaving surface (41) by a milling (330) of a convex blade, and this bending groove is
As shown in FIG. 7 (d), it is bent and glued to perform edge protection processing (40). In the cutting bell knife method, first, a blank (100) shown in FIG. 8 (a) is used.
As shown in FIG. 8B, the surface of the innermost layer of the heat-sealable synthetic resin at the edge to be edge-protected is pressed by a pressing plate (340), and a bowl-shaped blade knife ( 3
In 50), the edge portion is stripped in a semicircular shape from the outermost layer side of the heat-sealable synthetic resin, and then, as shown in FIG. The creasing roller (360) makes a bending line (44), and as shown in FIG. 8 (d), a habit folding jig (41) usually called a habit folding sword.
8), and then, as shown in FIG. 8 (e), the fold portion of the blank (100) is crushed by upper and lower pressing rollers (310). As shown, the outermost layer around the edge of the stripping surface (43) is
At 80), the surface was heat-melted, and as shown in FIG. 8 (g), the bending streaks were bent and bonded to perform edge protection processing (40).

[0003]

However, in the conventional edge protection processing of the liquid paper container described above, in the cutting milling method, when cutting the bending groove, the paper powder cut in the previous process is scattered and pressed. In some cases, the groove may enter between the roller and the blank, and as a result, the bent groove may be cut deeply, and a pinhole may be generated. In addition, in the cutting bell knife method, when a bending line is formed with a cleaning roller, when the blank is thick or the gap between the convex and concave rollers is small, cracks are easily generated, and the bending dimension has large variation. Was.

The present invention has solved the above-mentioned problem in the conventional edge protection processing of a liquid paper container, and is liable to occur at the bending position of the edge protection processing portion by the conventional cutting milling method or cutting bell knife method. An object of the present invention is to provide a method for edge protecting a liquid paper container, which prevents pinholes and cracks, and has a good bending dimension accuracy.

[0005]

That is, the present invention relates to a method of manufacturing a liquid paper container in which a blank made of a synthetic resin layer whose outermost layer and innermost layer are heat-fusible is folded and made into a box.
At the bending position of the edge portion of the blank to be edge-protected, the innermost layer side is pressed with a pressing roller to cut a bending groove from the outermost layer side by milling of a convex blade, and the innermost layer side of the blank is a pressing plate. And press the edge of the blank from the outermost layer side with a bell knife of a bowl-shaped blade in a semicircular cross-sectional shape, and hammer the edge of the blank from the bending groove toward the outermost layer side with a hammering jig. Fold, crush the habit folded portion of the blank with upper and lower pressing rollers, heat-melt the outermost layer of the periphery of the stripped surface of the blank with a burner, insert the blank into a folding jig, An edge protection method for a liquid paper container, wherein a front end of a bent portion is bonded to the outermost layer which is melted by heat.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an edge protection method for a liquid paper container according to the present invention will be described in detail with reference to the drawings.

The blank used in the manufacture of the liquid paper container of the present invention comprises a synthetic resin layer in which the outermost layer and the innermost layer are heat-fusible. For example, as shown in FIG.
0), a body (20) and a bottom (30), a sticking plate (110), a left side plate (120), a front plate (130),
The right side plate (140) and the back plate (150) are sequentially provided via the fold line (104). For example, the edge of the sticking plate is edge protected. Then, a sleeve is produced by heat-sealing the outer layer surface of the blank sticking plate and the inner layer surface of the edge portion of the back plate with a sack sticking machine, and the sleeve is loaded into a content filling machine.
After filling and sealing, for example, as shown in FIG.
No. 0) is for producing a gable-top type liquid paper container (200).

In the edge protecting method for a liquid paper container according to the present invention, first, as shown in FIG. 1 (a), the innermost layer is pressed to the bending position of the edge of the blank (100) to be edge protected. 2 by pressing with a roller (310) and milling a convex blade (330) from the outermost layer side.
As shown in (a), the bent groove (42) is cut, and then, as shown in FIG.
The innermost layer is pressed by a pressing plate (340), and the edge portion of the innermost layer is pressed by a bowl-shaped blade knife (350) from the outermost layer, as shown in FIG.
As shown in FIG. 1, the cross-sectional shape of the peeling surface (43) is peeled off in a semicircular shape, and as shown in FIGS. ), And then, as shown in FIGS. 1 (d) and 2 (d), the fold portion of the blank (100) is crushed by upper and lower pressing rollers (310). 1 (e) and FIG.
As shown in (e), the innermost layer side of the blank (100) is pressed with a water tube (370), and the outermost layer on the periphery of the peeling surface (43) is thermally fused with a burner (380), and As shown in FIG. 1 (f), this blank (100) is inserted into a folding jig (3) usually called a folding sword.
90), the front end of the bent portion is adhered to the hot-melted outermost layer, and the cut section of the blank is covered with the innermost synthetic resin layer, as shown in FIG. 2 (f). This is to perform edge protection processing (40). That is, a milling bell knife method is used.

In the conventional cutting milling method, first, while pressing the innermost layer of the edge to be edge-protected of the blank with a pressing roller, a half of the thickness is cut off from the outermost layer by milling with a flat blade. Then, while pressing the surface of the innermost layer with a pressing roller, the bending groove is cut at a predetermined position on the shaving surface by milling of a convex blade, so when cutting the bending groove, When the paper powder cut in step (1) is scattered and enters between the pressing roller and the blank, the bent groove may be cut deeply to generate a pinhole. On the other hand, the milling bell knife method, which is the edge protection method of the liquid paper container of the present invention, firstly presses the innermost layer side with a pressing roller at the bending position of the edge to be edge-protected, and projects from the outermost layer side. Cut the bending groove by milling the blade, then press the innermost layer side of this blank with a pressing plate, and peel off the edge from the outermost layer side with a bowl-shaped bell knife in a semicircular cross section. As a result, the depth of the bent groove is accurately cut, and no pinhole is generated in the bent groove.

In the conventional cutting bell knife method, first, while pressing the surface of the innermost layer of the edge portion to be edge-protected of the blank with a pressing plate, the edge is cut from the outermost layer side with a bowl-shaped blade knife. Since the blank is thickened or the gap between the convex and concave rollers is small, cracks may occur. And the bending dimensional accuracy was not good. on the other hand,
In the milling bell knife method of the present invention, since a bending groove is cut at a bending position of an edge portion by milling of a convex blade, cracks do not occur in the bending groove, and the bending dimensional accuracy is also adjusted. Is good.

In order to compare the bending dimensional accuracy of the conventional edge-knife-processed portion with the bell knife system and the bending dimensional accuracy of the edge-protected portion with the milling bell-knife system of the present invention, the bending of each edge-protected portion is performed. The width dimension was measured. Table 1 shows the results.

[0012]

[Table 1]

According to the measurement results of the bending width of the edge protected portion, as shown in Table 1, the milling bell knife system of the present invention bends at the bending groove cut by milling, so that the bending width dimension variation. On the other hand, in the conventional bell knife method, since the conventional bending knife is bent by the bending line of the cleaning roller, the dimensional variation of the bending width is large and unstable.

[0014]

The liquid paper container manufactured by the edge protection processing method of the present invention has no pinholes or cracks at the bending position of the edge protection processing portion in the container, and further, has excellent bending dimensional accuracy.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views showing steps of an edge protection method for a liquid paper container according to the present invention, in which FIG. 1A shows cutting of a bending groove, FIG. 1B peels off, FIG. ) Is crushed, (e) is thermal fusion of the outermost layer at the periphery of the peeling surface, and (f) is adhesion between the tip of the bent portion and the outermost layer.

FIG. 2 is a perspective view of a main part showing a shape of a blank in each step of the edge protection processing shown in FIG. 1, (a) after cutting a bent groove, (b) after peeling, and (c). (D) is after crushing, (e) is after thermal fusion of the outermost layer at the periphery of the peeling surface, and (f) is after bending and bonding.

FIG. 3 is a developed plan view of a blank of an example of a liquid paper container.

FIG. 4 is a perspective view of a liquid paper container boxed using the blank of FIG. 3;

FIG. 5 is an enlarged sectional view of a portion A in FIG. 4 when edge protection processing is performed.

FIG. 6A shows a state when edge protection processing is not performed.
It is an expanded sectional view of a part.

FIGS. 7A and 7B are explanatory views showing steps of a conventional example of an edge protection processing method for a liquid paper container, wherein FIG. 7A shows a blank before processing, FIG. 7B shows cutting of a cut surface, and FIG. Cutting of the groove, (d) is bending and bonding with glue.

FIG. 8 is an explanatory view showing steps of another conventional example of an edge protection method for a liquid paper container, in which (a) is a blank before processing, (b) is peeled off, and (c) is a bending line. (D) is a habit fold, (e) is a crush of the habit fold, (f) is a thermal fusion of the outermost layer on the periphery of the peeling surface,
(G) shows the adhesion between the tip of the bent portion and the outermost layer.

[Explanation of symbols]

 10 Top 20 Body 30 Bottom 40 Edge protection 41 Cutting surface 42 Bending groove 43 Stripping surface 44 Bending line 100 Blank 101 Intermediate layer 102 Innermost layer 103 Outermost layer 104 Fold line 105 Cut section 110 Adhesive plate 120 Left side plate 130 Front plate 140 Right side plate 150 Back plate 200 ... Liquid paper container 310 ... Pressing roller 320 ... Milling of flat blade 330 ... Milling of convex blade 340 ... Pressing plate 350 ... Bell knife 360 ... Cleaning roller 370 ... Water tube 380 ... Burner 390 ... Folding jig 410 …… Habit folding jig

Claims (1)

[Claims] In the manufacture of a liquid paper container in which a blank made of a synthetic resin layer whose outermost layer and innermost layer are heat-fusible is folded and made into a box, a bending position of an edge of the blank to be edge protected is provided. The innermost layer side is pressed with a pressing roller, the bent groove is cut from the outermost layer side by milling with a convex blade, the innermost layer side of the blank is pressed with a pressing plate, and the outermost layer side is ended with a bowl-shaped blade knife. The cross section of the blank is peeled off in a semicircular shape, and the edge of the blank is bent from the bending groove toward the outermost layer with a bending jig. Crushed, the outermost layer of the periphery of the stripped surface of the blank was hot-melted with a burner, the blank was inserted into a folding jig, and the tip of the bent portion was bonded to the hot-melted outermost layer. Liquid paper container edge characterized by the following: Rotekuto processing method.