JP2001206446A - Method for sealing box-shaped container and box-shaped container manufactured using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for sealing a box-shaped container by heat- welding wherein the method is free from contamination of working environments and disposal problems, and to provide a box-shaped container manufactured using the method. SOLUTION: The method of sealing a lid 20 having a polyolefin resin based sealant layer 25 with a box body 10 with an upper part opened and having an opening 6 equipped with folds 11, 21, 31, 41 with upper ends folded inward by heat-welding comprises steps of providing, in advance, heat seal lacquer formation layers 13, 23, 33, 43, which are heat-weldable to the sealant layer 25 of the lid on an overcoat varnish layer at a contact part of the box body 10 with the lid 20 and heat-welding the sealant layer 25 with the heat seal lacquer formation layers 13, 23, 33, 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of heat sealing a lid material to an open portion of a box body provided with a folded portion having an open upper portion and an upper end folded inward, and a method using this method. For the box-shaped container manufactured in detail, dog food, fertilizer, powder detergent, cocoa, a method of sealing a box-shaped container for storing solids other than liquids such as coffee or liquid, using this sealing method The present invention relates to a box-shaped container manufactured by the above method.

[0002]

2. Description of the Related Art As a method of sealing an opening of a box body having an opening with an open top and a folded portion having an upper end turned inward, an overcoat varnish layer (hereinafter referred to as an OP varnish) is formed on the surface of the box body. In order to seal the peripheral portion with the lid, for example, as shown in FIG. 3, an emulsion type aqueous adhesive was applied to the peripheral portion to form the adhesive layer 61. A lid member 60 made of paper or the like is placed over an opening having a folded portion 51 formed on the peripheral edge of the box body 50 and thermally bonded, or a plastic molded article 62 is formed on the upper edge of the peripheral wall of the box body 50 as shown in FIG. And a method of heat-sealing the lid member 60 to the opening inside the plastic molded product 62.

[0003] The method shown in FIG.
Since the varnish layer is provided, it is difficult to heat seal the lid, so that an emulsion-type aqueous adhesive is used. There is a problem that strength is not obtained until it is dried.
In addition, since the method shown in FIG. 4 uses a plastic molded product, it is necessary to separate and discard the plastic molded product after use, or when the plastic molded product is fitted and adhered to the box body,
There is a problem that a hot melt adhesive is used.

[0004]

SUMMARY OF THE INVENTION The present invention relates to
Attention is paid to a method of sealing a box-shaped container body having a varnish layer and an opening provided with a folded portion on the periphery and a lid member, and the above-described problems relating to a box-shaped container manufactured by using this method. It is an object of the present invention to provide a method of sealing a box-shaped container by heat fusion, which has no problem in working environment pollution and disposal processing, and a box-shaped container manufactured by using this method.

[0005]

Means for Solving the Problems A first invention of the present invention is:
In a sealing method in which a lid member having a polyolefin resin-based sealant layer is hermetically sealed to a box body having an opening having an opening whose upper part is turned inward by turning the upper end inward, a lid of the box body is provided. A heat seal lacquer forming layer having heat sealability to the sealant layer of the lid material is provided in advance on the OP varnish layer at a contact point with the material, and the sealant layer and the heat seal lacquer forming layer are heat-sealed. A method for sealing a box-shaped container characterized by the following.

[0006] As described above, the heat seal lacquer forming layer having a heat-sealing property with respect to the sealant layer of the lid material is provided on the OP varnish layer in advance at the contact portion of the box body with the lid material. And the heat seal lacquer forming layer of the box body can be hermetically sealed by heat fusion.

According to a second aspect of the present invention, in the first aspect, the heat seal lacquer forming layer is formed simultaneously with printing on the box body using a printing machine. This is the sealing method.

As described above, since the heat-seal lacquer forming layer can be applied simultaneously with printing on the box body by using the printing unit having a surplus printing machine, a separate step is not required and the formation is performed in a series of printing steps. Can be.

Further, a third invention is a box-shaped container produced by using the method for sealing a box body and a lid member according to the first or second invention.

[0010] In the box-shaped container manufactured by using the method of sealing the box body and the lid member, the opening of the box body is completely sealed. But does not dissipate outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. FIG. 1 is a partial cross-sectional explanatory view showing an example of a box-shaped container manufactured by using the box-shaped container sealing method of the present invention, and FIG. 2 is a plan explanatory view of a box body used in the present invention in a blank state. is there.

First, a blank for a box body provided with an ultraviolet-curable OP varnish layer on the surface used in the present invention is prepared.
In the blank, the side walls 1, 2, 3, 4, and the adhesive margin piece 5 are sequentially provided via bending lines.

A folded portion 11 is connected to the upper edge of the side wall 1 via a bending line a, and a bottom piece 12 is connected to the lower edge via a bending line. A folded portion 21 is continuously provided on the upper edge of the side wall 2 via a bending line a, and a bottom piece 22 is continuously provided on the lower edge via a bending line. Side wall 3
A folded portion 31 is continuously provided on the upper edge via a bending line a, and a bottom piece 32 is continuously provided via a bending line on the lower edge. Further, a folded portion 41 is connected to the upper edge of the side wall 4 via a bending line a, and a bottom piece 42 is connected to the lower edge via a bending line.

On the OP varnish layer of the folding line a on the upper side of each side wall, lacquer coating layers 13, 23, 33, 43 are formed on the upper and lower edges of the folding line a at the center.

[0015] This lacquer coating layer is composed of blank characters,
When a printing layer such as a pattern is formed by a printing machine, the printing unit can be formed continuously in a series of steps in a printing process by using a printing unit having a surplus printing machine.

At the time of printing, the folding portions 11, 21, 3
A suitable adhesive such as a hot melt adhesive may be partially applied to the back surfaces of the first and the first 41, and the folded portion may be bonded to the side wall when the folded portion is bent inward.

A lacquer for forming the lacquer coating layers 13, 23, 33, 43 has a good adhesiveness with the polyolefin resin-based sealant layer of the lid member 20, trade name: EXP-170 (Dainippon Ink Chemical Industry) A known lacquer such as Secadyne 1900W (manufactured by Dainichi Seika Kogyo Co., Ltd.) or the like can be used.

Separately, polyethylene, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer (EAA), ionomer, ethylene-vinyl acetate copolymer (EVA), etc. Is prepared as the sealant layer 21 of the polyolefin-based resin.

Next, the previously prepared blank is folded along a folding line, and assembled into a box body 10 having an opening 6 provided with a folded portion whose upper end is folded at the upper periphery (see FIG. 1). As described above, the folded portions 11, 21, 3
The reference numerals 1 and 41 are used to form an adhesive portion at the upper end and to reinforce the upper edge of the side wall by folding the inside of the side wall 1, 2, 3, 4 (may be bonded to each side wall if necessary). Is responsible for.

After housing the assembled box body 10 with granular or powdery contents such as a powdered detergent, the lid 20 is covered with the sealant layer 25 inside so as to cover the opening 6 and then thermocompression-bonded from above. By doing so, the lid member 20 and the box body 10 are separated from each other by the sealant layer 25 and the heat seal lacquer forming layer 1.
3, 23, 33 and 43 are heat-sealed and completely sealed.

[0021]

As described above, according to the present invention, O
Since the heat seal lacquer is pattern-coated on the folded portion of the box body provided with the P varnish layer by a printing method, it is not necessary to apply a heat seal lacquer or a hot melt adhesive to the lid material, and the lid material is thermally fused. It can be bonded and sealed to the upper end of the folded part. Further, it is not necessary to apply another material to the lid material in order to seal the lid material, which saves material.

Furthermore, since the upper end of the folded portion having the OP varnish layer is sealed with a lid member having a polyolefin-based sealant, an aqueous emulsion adhesive is not used at the time of joining the box body and the lid member. Also, there is no need for cleaning or the like.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional explanatory view showing an example of a box-shaped container manufactured by using the box-shaped container sealing method of the present invention.

FIG. 2 is an explanatory plan view showing a blank state of an example of a box main body used in the present invention.

FIG. 3 is a partially sectional explanatory view showing a conventional method of sealing a box-shaped container.

FIG. 4 is a partial cross-sectional explanatory view showing another example of a conventional box-shaped container sealing method.

[Explanation of symbols]

1, 2, 3, 4 Side wall 5 Glue piece 6 Opening 10 Box body 20 Lid material 25 Sealant layer 11, 21, 31, 41 Folded part 12, 22 , 33, 43 {Bottom piece 13, 23, 33, 43} Heat seal lacquer forming layer 50 {Box body 51} Folding part 60 {Cover material 61} Adhesive layer using aqueous emulsion type adhesive 62} Plastic moldings

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E049 AB02 BA03 DA01 DB01 3E060 AA03 AB05 BA03 BC08 CG12 CG24 DA13 EA04 EA13 EA14 EA20 3E067 AA05 AB23 AB99 AC01 BA06A BA20A BB01A BB14A BB15A BB26 FA06 EA26

Claims (3)

[Claims] 1. A sealing method for sealing a lid having a polyolefin resin-based sealant layer to a box body having an opening provided with a folded portion having an open upper portion and an upper end folded inward by heat fusion. A heat seal lacquer forming layer having heat sealability with respect to the sealant layer of the lid material is provided in advance on the overcoat varnish layer at a contact point with the lid material of the box body, and the sealant layer and the heat seal lacquer forming layer are provided. A method for hermetically sealing a box-shaped container, characterized by heat-sealing. 2. The method according to claim 1, wherein the heat seal lacquer forming layer is formed simultaneously with printing on the box body using a printing machine. 3. A box-shaped container produced by using the sealing method according to claim 1.