JP2607490Y2 - Paper container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The invention relates to a paper made of paper which is improved in the joint between a body constituting a container and a lid which closes an opening of the body, is resistant to pressure changes inside and outside the container, and has excellent impact resistance. It concerns a container.

[0002]

2. Description of the Related Art In a conventional paper container such as a paper pack, as shown in FIG. 3 , an end of a body 2 constituting a container 1 is folded to form a folded portion 2a.
Is bent to form a bent portion 3a,
Across the bent portion 3a of the lid 3 between the side walls 2b and the folded portion 2a of the body 2, the contact surface of the contact surface S ₁ of the bent portion 3a and the fold-back portion 2a, and the bent portion 3a and the side wall 2b It is adhered to S _2, respectively.

Further, as shown in FIG. 4 , the end of the body 2 is folded back and bonded in advance to form an overlapped portion 2c, and the overlapped portion 2c is again folded back to allow a gap between the overlapped portion 2c and the side wall 2a. 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 2a.

[0004]

However, in these conventional paper containers 1, the pressure inside the container 1 is reduced due to factors such as a case where the container 1 is dented by an external impact or a change in temperature. When the pressure rises, as shown in FIG. 5 , the pressure P is applied to the lid 3, stress is concentrated on the bonding portion between the body 2 and the lid 3, and there is a problem that 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 concentrates stress at the joint 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 that can prevent peeling damage and damage to the container based on the damage.

[0007] Japanese Utility Model Publication No. 38-8599 proposes an extruded tube in which a synthetic resin tube body 5 and a synthetic resin bottom cover 3 are connected. This extruded tube is shown in FIG.
A non-adhesive layer is formed on the contact surface between the bottom cover curved side 1 of the bottom cover 3 and the inner wall surface of the tube body 5, and the contact surface between the outer surface of the tube body 5 and the thin bent side 4 Indicates a welded structure. However, this extruded tube uses a thermoplastic synthetic resin as the material of the container to be deformed, and this synthetic resin is inherently flexible. Due to this material characteristic, each part of the extruded tube expands due to an increase in internal pressure. It is technically natural to adopt a configuration in which the contact portion between the tube body 5 and the bottom lid 3 has such a clearance as described above, since it tends to be easily deformed and easily ruptured by the deformation.

On the other hand, in a paper container, since the paper body and the paper bottom cover have the property of not being flexible or stretchable, it is common technical knowledge that the joint portion is firmly bonded to the paper container. The above method, which is adopted in the case of a flexible synthetic resin which is a different technique, cannot be helpful.

[0009]

In order to achieve the above object, a paper container according to the present invention is provided such that an end of a paper body is directed inwardly.
A folded portion is formed by folding the paper body in a U-shaped cross-section so as to extend upward, and the outer peripheral edge of the paper lid closing the opening of the paper body is L- shaped along the side wall of the paper body. forming a bent portion by bending shape, a bent portion of the L-shaped and fitted into the gap of the U-shaped side wall and a turned-back portion of the body made of the paper, the paper lid made of the bent portion
Only the inner contact surface formed by the outer surface side and the folded portion is adhered to the side wall of the paper body and the inner surface side of the bent portion of the paper lid.
As non-adhering the outer contact surface to be more formed, in which the gap with the deformation of the sheet steel lid to the non-adhesive surface is configured to so that to occur.

As the material of the body and lid constituting this 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.

[0012]

[Operation] The paper container of the present invention has the above-mentioned configuration. Of 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-contact. When the container is subjected to an external impact or pressure fluctuations inside and outside the container are applied, the gap between the lid and the body of the non-adhesive surface is like a hinge. As a result, the stress is not concentrated on the portion serving as the bonding surface, and the sealing performance of the container is reliably maintained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a paper pack will now be described with reference to the drawings.

The paper container (paper pack) of the embodiment shown in FIG.
In 1, inward of the lower ends of the body 2 constituting the paper pack 1
And fold it back into a U-shape so that it runs along the top.
2a, while the outer periphery of the bottom cover 3 constituting the paper pack 1
Fold the edge downward into an L shape along the side wall 2b of the fuselage 2.
To form a bent portion 3a, and this bent portion 3a is
Left and right sides are sandwiched between the side wall 2b and the folded part 2a.
A joint having a three-layer structure is formed in the direction.

In this embodiment , the folded portion 2a of the body 2 and the bent portion
3a adhesive or heat dissolve the contact surface S ₁ of the outer surface of the bottom lid 3
The inside of the bottom cover 3 of the bent portion 3a and the body 2
The contact surface S ₂ of the side wall 2b of the is obtained by the non-adhesive. This
By using such a structure, the paper pack 1
If dropped to give a shock or dent
In the case where the pressure inside and outside the paper pack 1 changes, as shown in FIG.
Thus, the contact surface between the side wall 2b of the body 2 and the bent portion 3a of the bottom cover 3
A gap D is formed in S ₂ to prevent concentration of stress.
it can.

In the above embodiment, the lid of the container 1 is used.
Although the bottom cover 3 is illustrated, the present invention is limited to this.
No, not to mention the lid, tea can, caulking cart
It can be applied to the inner lid used for containers such as ridges.
Wear.

[0017]

[Effect of the invention] In the paper container of the present invention, the end of the paper body is
Fold it back into a U-shape so that it runs inward and upward
A paper-made member forming a folded portion and closing an opening of the paper-made body.
The outer edge of the lid is L-shaped along the side wall of the paper body.
The bent portion is formed by bending the L-shaped bent portion.
Fit into the U-shaped gap between the side wall of the fuselage
And the inside formed by the bent portion and the outer surface of the paper lid
Only the contact surface is adhered, and the side wall of the paper body and the paper
The outer contact surface formed by the inner surface of the lid
A gap is formed on the non-adhesive surface due to the deformation of the paper lid.
The following effects can be achieved
it can.

When a folded portion is formed at the end of the paper body,
Then, bend the end of the paper lid to form a bent part,
Into the gap between the side wall of the paper trunk and the folded portion, and
The inside of the curved portion formed by the outer surface side of the paper lid and the folded portion
Since only the side contact surfaces are glued, minimal
Resistance to impact resistance and the ability to respond to pressure changes inside and outside the container depending on the process
An excellent paper container can be easily manufactured.

That is, the folding formed at the end of the paper lid
The contact surface between the paper and the folded part formed at the end of the paper body.
On the other hand, between the folded part of the paper lid and the side wall of the paper body,
By making the contact surface a non-adhesive surface, it is possible to
When a pressure change is applied, the part that has been
The gap between the paper body and the paper lid
Absorbs force and concentrates stress on the bonding surface between the bent part and the folded part
Peeling damage caused by the
It can prevent embodiment and damage.

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a joint portion between a body and a bottom cover of a paper container according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where stress is applied to a joint of the paper container of FIG. 1;

FIG. 3 is a cross-sectional view of a joining portion between a body and a bottom cover of a conventional paper container.

FIG. 4 is a cross-sectional view of a joining portion between a body and a bottom cover of a conventional paper container.

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

[Explanation of symbols]

1 paper containers (cartons) second body 2a bent portion 2b side wall 3 cover (bottom cover) 3a bent portion S ₁ inner contact surfaces S ₂ side contact surface

Claims (1)

(57) [Scope of request for utility model registration] 1. An end portion of a paper body is directed inward and upward.
Folded back into a U-shape to form a folded part,
The paper outer peripheral edge portion of the paper lid for closing the opening of the paper body
The paper-made body is bent into an L-shape along the side wall thereof to form a bent portion. The L-shaped bent portion is inserted into a U-shaped gap between the side wall of the paper body and the folded portion, and the folded portion is folded. The paper lid of the curved part
Of bonded only the inner contact surfaces S _1, which is formed by the outer surface side, on the inner surface side of said paper-made lid side wall and the bent portion of the paper body
Ri outer contact surfaces S ₂ which is formed as a non-adhesive, paper containers which gap D with the deformation of the sheet steel lid to the non-adhesive surface is configured to so that to occur.