JP2603505Y2 - Paper container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention provides an improved joint between a body constituting a container and a lid for closing an opening of the body.
The present invention relates to a container that is resistant to pressure changes inside and outside the container and has excellent impact resistance.

[0002]

2. Description of the Related Art In a conventional container, for example, a paper pack, as shown in FIG. 5, an end of a body 2 constituting a container 1 is folded to form a folded portion 2a. The edge of the lid 3 is bent to form a bent portion 3a.
Is sandwiched between the side wall 2b of the body 2 and the folded portion 2a,
The contact surface S ₁ of the bent portion 3a and the fold-back portion 2a, bent portion 3a and the side wall
The contact surface S ₂ of the 2b are bonded respectively.

Further, as shown in FIG. 6, the end of the body 2 is folded back and adhered in advance to form an overlapped portion 2c, and the overlapped portion 2c is folded back again, and the gap between the overlapped portion 2c and the side wall 2b is formed. the sandwiched bent portion 3a of the lid 3, is with the contact surface S ₁ of the overlapping portion 2c and bent portion 3a, also the container 1 was bonded to the contact surface S ₂ of the bent portion 3a and the side wall 2b.

[0004]

However, in these conventional containers 1, the pressure inside the container 1 has increased due to factors such as a case where the container 1 is dented by an external impact or a change in temperature. In this case, as shown in FIG. 7, there is a problem that the pressure P is applied to the lid 3 so that stress is concentrated on a bonding portion between the body 2 and the lid 3 and peeling damage C occurs in this portion.

[0005] In particular, when the container 1 contains a liquid, if the peeling damage C occurs, there is a problem that the liquid leaks out. Further, when the container 1 is a paper pack, However, there is a problem in that the liquid penetrates into the paper layer from the portion of the peeling damage C to significantly reduce the strength of the container 1 and eventually leads to breakage. In view of the above problems, the present invention considers that stress is concentrated on the bonding portion between the body and the lid constituting the container when an external impact is applied or when the pressure inside and outside the container changes. It is an object of the present invention to provide a container which can prevent peeling damage and breakage based on the damage.

[0006]

Means for Solving the Problems] paper container according to the present invention for achieving the above object, forms a in fold return Shi Department of U-shaped cross section by folding the end portion of the paper body to the inside, the bending fold the ends of the paper lid for closing the fuselage opening outwardly, further
Overlapped portion to form polymerized in heavy engaging portion folded portion of this
The fitted by bonding contact surface between the polymer portion and the folded portion constitutes a contact surface with the body of the side walls and Polymerization portion as a non-adhesive, with the non-adhesive portion to the deformation of the paper-made lid The gap is shaped
It is constituted so that it may be performed .

As the material of the body and lid constituting the container, various materials such as paper, a composite material in which paper and a synthetic resin film are laminated, and a composite material in which paper, a synthetic resin film and metal foil are laminated, and the like are used. In addition, in the bonding portion between the body and the lid, the overlapping portion may be formed by folding the end portion in advance, or a structure in which the bonding is performed in a single layer.

Further, as a method of bonding the body and the lid, in addition to the method of using an adhesive, in a method having a synthetic resin layer, the bonding can be performed by welding. The present invention can be applied to the case where the above-mentioned lid is a top lid, a bottom lid, or a middle lid.

[0009]

[Operation] The container of the present invention has the above-mentioned configuration, and among the plurality of contact surfaces between the lid and the body, some of the contact surfaces are used as an adhesive surface, and the remaining contact surfaces are non-adhesive surfaces. When the container receives an external impact or pressure fluctuations inside and outside the container act, the space between the lid and the body expands like a hinge at the non-adhesive surface. Because it is open, stress does not concentrate on the part that was used as the bonding surface,
The tightness of the container is reliably maintained.

[0010]

Next, an embodiment in which the present invention is applied to a paper pack will be described with reference to the drawings. The container (paper pack) 1 of the embodiment 1 shown in FIG. 1 has an edge of a lid (bottom lid) 3 folded downward, further folded upward and adhered to form a polymerized portion 3b in advance. on the other hand, by folding the lower end of the body 2 so as to wrap the overlapping portion 3b, to form a folded portion 2a, while adhering to the contact surface S ₁ of this folded portion 2a overlapping portion 3b, the polymerization unit 3b and the body The contact surface S2 with the _second side wall 2b is not bonded.

The body 2 and the bottom cover 3 constituting the paper pack 1 of this embodiment are both formed of a composite material in which a polyethylene film is laminated on both sides of paper, and the folded portion 2a and the bottom of the body 2 are heated by heating. the contact surface S ₁ of the overlapping portion 3b of the lid 3 welded, whereas, at this time, the side wall 2b of the overlapping portion 3b and the body 2 of the bottom lid 3
As the contact surface S ₂ are separated with, sandwich the sheet of insulation material (not shown), in which the contact surface S ₂ and the non-adhesive.

With such a structure, when an external impact is applied to the paper pack 1 or when the pressure inside and outside the paper pack 1 changes, as shown in FIG.
The pressure P acts as pressing the bottom cover 3 downward, but in the contact surface S ₂ of the overlapping portion 3b of the side wall 2b and the bottom lid 3 of body 2 which is a non-adhesive, the bottom lid 3 side wall 2b Separated,
Since a gap D is formed between the two so as to expand upward, the stress is dispersed.

Next, in a second embodiment shown in FIG. 3, the lower end of the body 2 constituting the paper pack 1 is folded upward to form a folded portion.
2a, while the edge of the bottom cover 3 constituting the paper pack 1 is bent downward to form a bent portion 3a, and the bent portion 3a is formed.
Is sandwiched between the side wall 2b of the body 2 and the folded portion 2a to form a joint having a three-layer structure in the left-right direction.

In this embodiment, the folded portion 2a of the body 2 and the bottom cover 3
The contact surface S ₁ of the bent portion 3a is bonded by an adhesive, is bonded so as not wrap the adhesive on the contact surface S ₂ of the side wall 2b of the bent portion 3a and the body 2. In this embodiment, similarly to the first embodiment, even if the paper pack 1 is dropped by mistake or the paper pack 1 is dented, as shown in FIG. A gap D is formed between the side wall 2b of the bottom cover 3 and the bent portion 3a of the bottom cover 3, so that concentration of stress can be prevented.

In each of the above embodiments, the bottom lid 3 is exemplified as the lid of the container. However, the present invention is not limited to this, and not only the top lid, but also a tea can, a caulking cartridge, etc. The present invention can also be applied to an inner lid used for a container.

[0016]

Paper container of the present invention, according to the invention] is folded back end of the paper body 2 inwardly to form a in fold return Shi part 2a of the U-shaped cross section, made of paper for closing the opening of the body 2 the end portion of the lid 3 songs folding outside <br/> side up, to form a further polymerized polymer portion 3b, this
The polymerization unit fitted Polymerization portion 3b in the folded portion 2a 3
Bonding the contact surface S1 between the folded portion 2a, constitute a contact surface S2 of the side wall 2b and the Polymerization portion 3b of the body 2 as a non-adhesive, with the non-adhesive portion to the deformation of the paper-made cover 3 Gap D
Is formed , the following effects can be obtained.

As a result of the above configuration, the paper pack 1 (container)
And the pressure inside and outside the paper pack 1 changes
In this case, as shown in FIG. 1 and FIG.
Is applied to push the body downward.
Since the contact surface S2 between the bottom cover 3 and the bottom cover 3 is not bonded,
Separates from the side wall 2b and expands upward between each other
Of the body 2 while forming a gap D such that
The portion 2a extends. The joint between the body 2 and the bottom cover 3 is deformed.
The cross section of the folded portion 2a of the body 2
It gradually expands to "L-shape", but the overlapping portion 3b of the bottom plate 3 is "L-shape".
It just transforms from "to". This means that
A force that pulls the welded portion of the surface S1 to the horizontal application
(Shearing Force) occurs, but weakens the seal
Such a peeling force does not occur.

That is, two sheets of paper are glued together, and
Even when tension is applied, it is virtually impossible to separate two sheets of paper.
It works in the same way as in difficult cases. In addition, normal
The deformation of the paper container is such that the body 2 expands outward.
When there is little deformation and the paper bottom lid 3 expands outward
In many cases, the present invention can substantially deform the paper body 2.
In addition, the seal structure between the bottom cover 3 and the body 2 is damaged.
The bottom lid 3 can be expanded and deformed without
You.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a joint between a body and a lid of a container according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where stress is applied to a joint of the container of FIG.

FIG. 3 is a cross-sectional view of a joint between a body and a lid of a container according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state where stress is applied to a joint of the container of FIG. 3;

FIG. 5 is a cross-sectional view of a joint between a body and a lid of a conventional container.

FIG. 6 is a cross-sectional view of a joint between a body and a lid of a conventional container.

FIG. 7 is a cross-sectional view showing a state where stress is applied to a joint of the container of FIG. 5;

[Explanation of symbols]

1 container (cartons) second body 2a folded portion 3 cover (bottom cover) S ₁ the contact surface S ₂ contact surface

Claims (1)

(57) [Scope of request for utility model registration] 1. An end portion of a paper body 2 is folded inward and cut.
Forming a in fold return Shi part 2a of the face shape, bending fold outward ends of the paper cover 3 for closing an opening of the body 2, to a further weight
Combined polymerization unit 3b is formed, folding the Polymerization portion 3b of this
Fitted in part within 2a by bonding a contact surface S1 of the folded portion 2a and the overlapping portion 3 constitutes a contact surface S2 of the side wall 2b and the Polymerization portion 3b of the body 2 as a non-adhesive, the non-adhesive In front of the department
A paper container configured such that a gap D is formed as the paper cover 3 is deformed .