WO2017029997A1

WO2017029997A1 - Paper container and method for producing same

Info

Publication number: WO2017029997A1
Application number: PCT/JP2016/072865
Authority: WO
Inventors: 柚原　徳崇; 洋秋葉
Original assignee: 凸版印刷株式会社
Priority date: 2015-08-18
Filing date: 2016-08-03
Publication date: 2017-02-23
Also published as: CN107922091A; CN107922091B; JP6822405B2; JPWO2017029997A1

Abstract

In a tab fused to the periphery of an opening provided in a paper container to cover the opening, a pinching section of the tab can be easily held from the surface of the paper container in which the opening is provided. Furthermore, the present invention provides a paper container that can be opened by enabling the tab to be easily peeled off. A paper container according to the present invention that is formed of a paper-based laminated sheet and has a top (331) is characterized by having an opening (2) in the top of the container and having a tab (4) that can close the opening. By providing, in the tab, a closing section (42) that covers the opening, a protruding section (41) protruding out from the closing section, and a crease (43) between the closing section and the protruding section, a gap (44) is provided between an end of the protruding section of the tab and the top.

Description

Paper container and manufacturing method thereof

The present invention relates to a paper container and a manufacturing method thereof. The paper container stores beverages such as fruit juice drinks, coffee, liquid soup, zenzai, etc., powders and granules of seasonings, rock salt, granular detergent, etc., and pulls out laminated sheets based on paper It is a paper container that is molded by fusing.

Traditionally, paper containers using sheet materials containing liquids such as coffee drinks, tea drinks, cocoa drinks, sake, liquid soup, soup flour, amazake, powders and granules of seasonings, rock salt, granular detergent, etc. A paper container containing a container has been developed that can fill a large amount of containers at a high speed and can easily handle various contents.
In such a paper container that can be used for a filling machine having a high filling property, an easy peel tab having a high easy opening property has been used as a part for sealing the opening.

For example, Patent Document 1 discloses a container opening structure in which an opening for discharging and / or injecting contents provided in a predetermined portion of a container body is closed by an easy peel sealing means. A container main body having a portion, an inner film and a pull tab, and at least a lid of the container main body having the opening is a laminate including a paper layer, a synthetic resin layer and a barrier layer, and the opening The periphery is closed from the inner side of the container by an inner film covering the end face of the opening and a pull tab covering from the outside of the container, and at least a predetermined width from the opening edge end face of the outer periphery of the opening. The inner film, the periphery of the opening, and the pull tab are joined to each other so as to provide a non-adhesive portion having the opening. That has proposed the opening structure.

However, even when a non-adhesive portion having a predetermined width from the opening edge end face is provided on the periphery of at least the outer body portion of the opening portion as in this paper container, when the pull tab is peeled off, the pull tab and the opening portion are provided. It is difficult to insert nails between the container body. For this reason, it is difficult to lift the pull tab and pinch it, and there is a problem that it takes time to open the pull tab.

Japanese Patent No. 4968235

An object of the present invention is to provide a paper container in which a tab can be more easily peeled from an opening.

In order to solve the problem, a paper container of one embodiment of the present invention is a paper container having a top plate in which an opening is formed and a tab for closing the opening, and the tab includes the opening. And a bulge formed between the closing part and the protruding part, and at least a tip of the protruding part is separated from the top plate. It has a gap with respect to the top plate.

The paper container manufacturing method of one embodiment of the present invention is characterized in that the fold of the tab is formed by a crease process that is pressed with a chevron-shaped mold and a valley-shaped mold.

In the paper container of the present invention, since the crease is provided between the closing portion of the tab and the protruding portion, the fingertip can be easily inserted between the top plate and the protruding portion of the tab. As a result, since the protruding portion of the tab can be easily grasped, the tab can be more easily peeled off, and the opening of the opening of the paper container can be made smooth.

It is an external appearance perspective view of the paper container and tab which concern on embodiment based on this invention. In the paper container which concerns on embodiment based on this invention, it is sectional drawing of the top plate vicinity which fuse | fused the tab. It is a schematic diagram of the shape of the press die (upper mold and lower mold) for folding the tab used in the paper container according to the embodiment of the present invention, and a sectional view showing the folding process of the tab. It is an external appearance perspective view which shows other embodiment which concerns on embodiment based on this invention.

Hereinafter, an embodiment of a paper container according to the present invention will be described with reference to the drawings.
In the embodiment, a cylindrical paper container will be described as an example of the paper container.
As shown in FIG. 1 (a), the paper container 1 of the present embodiment is formed by rolling a laminated sheet having a paper base material to form a cylindrical body portion 30, and bending the cylindrical body portion 30 up and down. The paper container is manufactured by sandwiching and fusing the

fusion portions

3310 and 3320 provided around the top plate 331 and the bottom plate 332. Therefore, in the paper container 1, the top plate fusion part 3310 and the bottom plate fusion part 3320 are provided vertically with a certain width.
An opening 2 is formed in the top plate 331. The tab 4 is fused to the top plate 331 so as to cover the opening 2.
In addition, you may cover the whole upper part of the paper container 1 with the cap 7 which covers a drinking mouth after filling the contents in the paper container 1.

FIG. 1B is an enlarged view of the tab 4. The tab 4 is fused to the top plate 331 at the periphery of the opening 2 so as to cover (seal) the opening 2, a protruding part 41 continuous to the closing part 42, and the closing part 42 and the protruding part 41. And a fold line 43 formed therebetween. The protruding portion 41 constitutes a portion to be gripped when the tab 4 is peeled from the top plate 331. As shown in FIG. 1, the protruding portion 41 is inclined in a direction away from the top plate 331 (on the opposite side to the fusion) with respect to the closing portion 42 with the crease 43 as a boundary. .

FIG. 2A is a cross-sectional view of the vicinity of the top plate 331 to which the tab 4 is fused.
The tab 4 is fused to the top plate 331 at the periphery of the opening so as to cover the opening 2 provided on the top plate 331 of the paper container. It is the closing portion 42 of the tab 4 that is fused to the top plate 331, and the protruding portion 41 of the tab 4 is separated from the top plate 331 with a crease 43 provided between the closing portion 42 and the protruding portion 41 as a boundary. Inclined.
At this time, the inclination angle of the protruding portion 41 with respect to the top plate 331 by the fold 43 is set large so that the tip of the protruding portion 41 has a gap 44 of 1.5 mm or more from the top plate 331 (FIG. 2 (a )reference).

When the gap 44 is less than 1.5 mm, it is difficult to insert a claw between the top plate 331 and the protruding portion 41 of the tab, so that the protruding portion 41 cannot be quickly grasped.
If the gap 44 is 1.5 mm or more, a nail is inserted between the top plate 331 and the protruding portion 41 of the tab to raise the protruding portion 41, and a finger can be easily inserted therebetween.
The gap 44 may be 1.5 mm or more, but is set to be lower than the top plate fusion part 3310, for example.
The gap 44 is the amount of the gap when the protruding portion 41 is in an unloaded state.

FIG. 2B is a cross-sectional view showing a state in which a finger is inserted between the top plate 331 and the protruding portion 41 of the tab, the protruding portion 41 is grasped, and the tab 4 is peeled from the top plate 331. is there. In this way, the protruding portion 41 is grasped, the tab 4 is peeled off and removed from the top plate 331, and the opening 2 is opened.

FIG. 3A is a schematic cross-sectional view showing a state of a mold for processing the crease 43 of the tab 4.
A tab laminated sheet 40 is inserted between an upper mold 45 made of a chevron mold and a lower mold 46 made of a valley mold, and pressed to a tab outer shape having a desired contour. Then, at the same time as punching into the outer shape of the tab by the press, a crease 43 is attached to the tab 4 once immediately after pressing, as shown in FIG.
However, immediately, as shown in FIG. 3C, the closed portion 42 and the protruding portion 41, which have a large curvature, become straight, and the tab 4 is bent only at the fold 43.
Here, the crease 43 may be a curved line shown in FIG. 1 (c) or a triangular shape shown in FIG. 1 (d) in addition to the straight crease shown in FIG. 1 (b). As shown in FIG. 1E, a multi-stage fold having a crease other than the crease 43 may be used.

Such crease processing of the tab 4 is manufactured by a press die as shown in FIG.
That is, one upper mold 45 uses a press mold in which the crease formation position is a mountain shape, and the other lower mold 46 has a valley formation in the crease formation position. The sharp position of the mountain shape is the crease position.
The processing depth 450 of the chevron shape or the valley shape is preferably in the range of 0.1 mm or more and 2.0 mm or less (see FIG. 3A). The processing depth 450 is a protrusion amount or a recess amount with respect to the reference surface.
If the processing depth 450 is less than 0.1 mm, the crease 43 is likely to return to the original state immediately after pressing, and the clearance from the top plate 331 may not be ensured to be 1.5 mm or more.
Further, when the processing depth 450 exceeds 2.0 mm, the tab base paper may be cut.
Therefore, the processing depth 450 of the chevron shape and the valley shape is set in the range of 0.1 mm to 2.0 mm, respectively, but preferably is not less than the thickness of the tab base paper and not more than 2.5 times the thickness of the tab base paper. Processing depth is preferred.

Furthermore, in the chevron-shaped mold 45, the two pressurization inclination angles sandwiching the apex of the chevron shape make the protruding part-side pressurization inclination angle 410 smaller than the closing part-side pressurization inclination angle 420. If the protruding portion side pressure inclination angle 410 is made larger than the closing portion side pressure inclination angle 420, the flatness of the closing portion is impaired, and when the periphery of the opening portion is fused, wrinkles are generated and the sealing performance is increased. May be damaged. For this reason, the protrusion part side pressurization inclination angle 410 is made small.

Similarly, the valley-shaped mold 46 has two pressurization inclination angles across the depression facing the apex of the chevron shape, and the two pressurization inclination angles are the closing part side pressurization inclination angles. The protrusion side pressure inclination angle 411 is made smaller than 421. This is because, when the protruding portion side pressurizing inclination angle 411 is made larger than the closing portion side pressurizing inclination angle 421, the flatness of the closing portion is lost, and when the periphery of the opening is fused, wrinkles are generated. There is a risk that the sealing performance is impaired. For this reason, the protrusion part side pressurization inclination angle 411 is made small.

FIG. 4 is an external perspective view showing another embodiment according to the present invention.
The three-dimensional shape of the paper container 1 according to the present invention is not limited to a cylindrical shape as shown in FIG. 1 but may be a paper cup shape as shown in FIG. Of course, the cup shape may be upside down.
Further, it may be a paper bell top container or a flat top paper container as shown in FIG.

In the case of a cylindrical or cup-shaped container, caulking protrusions that caulk the body and the top plate can be formed around the top plate 331.
In addition, the opening 2 can be applied with the mouth in the vicinity of the opening 2 as it is, whether the powder or fluid is shaken out of the opening, or whether the opening 2 is stabbed into the opening 2 and sucked. Is generally provided at an offset position rather than at the center of the top plate.
Naturally, the closing part 42 is fused to a position covering the opening 2 provided at a biased position. The protruding portion 41 of the tab is directed toward the center side of the top plate 331.

The paper container targeted by the present invention is not particularly limited as long as it is formed from a laminated sheet having paper as a base material and an opening is formed in the top plate. For example, a container having an opening that can be fused with a flange, whether the substrate is made of paper, a plastic sheet molded, vacuum molded or pressure molded, or injection molded Any container can be used.
In addition, the description has been made mainly on the cylindrical paper container, but it may be a prismatic shape, a truncated cone shape, or a paper container of a gobel top or a flat top.
When the main body of the container is a paper-based container, the body, top plate, and bottom plate are each made of paper having a basis weight of 200 g / m ² to 800 g / m ² and printed on the surface. For example, coated manila, coated ball, ivory, etc., which are white on one side can be used. If possible, it is desirable that the body is thicker than the top plate or the bottom plate.

Furthermore, the top and bottom of the paper container, the back portion of the body portion, and the tab 4 need to be heat sealed. For this reason, a laminated sheet is used in which a thermoplastic film excellent in sealing properties such as a polyethylene film of 15 μm to 80 μm, an ethylene / vinyl acetate copolymer, or a polypropylene film is bonded to both sides. These thermoplastic films also take into account the hygiene when the contents are food, and also serve as a moisture barrier.
Of course, in order to improve the barrier property, a laminated sheet in which an aluminum foil, a polyethylene terephthalate film deposited with silicon oxide, aluminum, or the like is laminated between the base material of the laminated sheet and the polyethylene on the inner surface may be used. These can be easily manufactured using a dry lamination machine or an extruder lamination machine.

As the laminated sheet for tabs to be the tab 4, for example, polyethylene terephthalate / low density polyethylene / paper / low density polyethylene / ethylene / vinyl acetate copolymer, polyethylene terephthalate / polyamide / modified low density polyethylene / paper / low density polyethylene / Uniaxially stretched polypropylene, biaxially stretched polypropylene / polyamide / modified low density polyethylene / paper / low density polyethylene / uniaxially stretched polypropylene, polyethylene terephthalate / polyamide / modified low density polyethylene / aluminum foil / low density polyethylene / uniaxially stretched polypropylene, polyethylene terephthalate / Low density polyethylene / paper / low density polyethylene / polyethylene terephthalate / silicon oxide deposited polyethylene terephthalate / adhesive / low density polyethylene / uniaxially stretched poly Propylene, it is considered a configuration such as.
The paper may be a paper having a thickness of about 50 to 250 g / m ² , but the paper may not necessarily be used.
These are produced by producing films with a tandem extruder lamination machine or dry lamination machine, and then performing punching and crease processing with a press machine.

For manufacturing the cylindrical paper container, for example, first, the body laminated sheet is die-cut, formed into a cylindrical shape by edge protection, and the back seal 301 is fused to produce the body 30.
The tab laminated sheet is cut out with a press die and simultaneously creased to produce the tab 4.
The outer shape of the laminated sheet for the top plate is extracted with a press die, and the tab 4 is fused and temporarily fixed to the outside of the opening 2 and its periphery. When removing the outer shape, the end is bent to form the top plate.
The outer shape of the laminated sheet for the bottom plate is extracted with a press die, a bent portion is bent at the end, and the bottom plate is formed.
Tighten the top plate to the top of the body and fuse it, and then wind and fuse the bottom plate to the bottom, fill the contents, seal the tab completely, plug the mouth, Filling and making cans of paper containers are completed.
Of course, the bottom plate or the top plate may be crimped after filling. In that case, the tab that has been creased from the beginning is fused to the opening.

As described above, the paper container of the present invention is provided with the crease 43 between the closing portion 42 and the protruding portion 41 of the tab 4, so that there is a sufficient gap between the top plate 331 and the tab 4. And can easily insert the fingertip. Therefore, the protruding portion 41 of the tab 4 can be easily grasped quickly, the protruding portion 41 is pulled up, the tab 4 is peeled off, and the paper container can be smoothly opened.
Further, when the tab 4 is removed from the tape (laminated sheet for tabs), if the crease 43 is pressed at the same time, there is no significant change in the manufacturing process, and the conventional manufacturing line can be used as it is. The advantages of the present invention are great, such as being able to manufacture with high productivity.

As described above, the entire content of Japanese Patent Application No. 2015-160965 (filed on August 18, 2015), from which the present application claims priority, forms part of the present disclosure by reference.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of each embodiment based on the above disclosure are obvious to those skilled in the art. That is, the present invention is not limited to the embodiments described above. Based on the knowledge of those skilled in the art, design changes and the like can be made to each embodiment, and an aspect in which such changes and the like are added is also included in the scope of the present invention.

1 container 2 opening 30 trunk (cylindrical trunk)
300 body (shape of the truncated cone body)
301 Back seal 331 Top plate 3310 Top plate fusion part 332 Bottom plate 3320 Bottom plate fusion part 4 Tab 40 Tab laminated sheet 41 Projection part 410 Projection part side pressure inclination angle (mountain mold side)
411 Pressurization inclination angle of protruding part (valley mold side)
42 Closing part 420 Closing part side pressure inclination angle (mountain mold side)
421 Closing part side pressure inclination angle (valley mold side)
43 Crease 44 Clearance 45 Upper mold (Yamagata mold)
450 Processing depth 46 Lower mold (Tanigata mold)
7 Cap

Claims

A paper container having a top plate in which an opening is formed and a tab for closing the opening,
The tab has a closing portion that covers the opening, and a protruding portion that is continuous with the closing portion,
A paper container, wherein a crease is formed between the closing portion and the protruding portion, and at least a tip of the protruding portion is spaced apart from the top plate and has a gap with respect to the top plate.
The paper container according to claim 1, wherein the gap is 1.5 mm or more.
A paper container manufacturing method for manufacturing the paper container according to claim 1 or 2,
The method of manufacturing a paper container, wherein the fold of the tab is formed by a crease process that is pressed with a chevron-shaped mold and a valley-shaped mold.
4. The method for manufacturing a paper container according to claim 3, wherein the processing depths of the chevron-shaped mold and the valley-shaped mold are in the range of 0.1 mm to 2.0 mm.
The two pressure inclination angles sandwiching the peak of the chevron-shaped mold of the chevron-shaped mold are smaller in the angle on the protruding part side than the angle on the closed part side. Item 5. A method for producing a paper container according to Item 4.
The valley-shaped mold of the valley-shaped mold has two pressurization inclination angles across a depression facing the apex of the chevron shape, and the two pressurization inclination angles are on the closing part side. 6. The method for manufacturing a paper container according to claim 3, wherein the angle on the protruding portion side is smaller than the angle.
The chevron-shaped mold and the valley-shaped mold are an upper mold and a lower mold, which are molds for cutting out a tab laminated sheet into a profile of the tab by pressing. The method for producing a paper container according to any one of claims 3 to 6.