JP3340465B2 - Method for peeling off bottles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle capable of easily and surely peeling off a base cup fixed to a so-called bottom of a bottle or a label fixed to a body of the bottle.
The present invention relates to a method for peeling off adhered matter.

[0002]

2. Description of the Related Art Conventionally, so-called blow-molded bottles made of heat-resistant resin have been widely used as liquid filling containers for drinking water and the like from the viewpoint of safety and ease of use.

A bottle made of such a heat-resistant resin is
Usually, a label indicating the contents or the like is attached to the side surface, and a member called a base cup is fixed to the bottom of the bottle in order to impart autonomy.

[0004]

However, recently,
Environmental destruction due to the disposable use of plastic containers has been highlighted as a major social problem, and the use of recycled plastic containers has been called for. When recycling a bottle container made of the above heat-resistant resin, the label or base cup of a different material from the container body,
Must be collected separately. Therefore, conventionally, a label or a base cup has been mechanically and forcibly peeled off by using a peeling jig such as a nail. However, with such a method, a base cup, a label, or the like having a high bonding strength cannot be easily peeled. Also,
There has been a problem that a part of the adhesive remains in the container. The present invention has been devised to solve such a problem, and an object of the present invention is to reliably and easily peel a base cup, a label, and the like from a bottle container made of a heat-resistant resin .
To provide a method for peeling off bottle adhered matter
It is in.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a bottle body made of a heat-resistant resin molded by blow molding , and a bottle fixed to the surface of the bottle body via an adhesive. A method for peeling the bottle-fixed substance from a bottle container having a fixed substance, the method comprising: an operating temperature at which a bottle body thermally shrinks and an adhesive bonding the bottle body to the bottle fixed substance softens. By using a heat treatment, the bottle body is peeled from the bottle body by utilizing the heat shrinkage force of the bottle body to return to the parison shape before blow molding.

[0006]

The bottle is formed into a parison before blow molding by heating at a temperature at which the bottle made of a heat-resistant resin thermally shrinks and at which temperature the adhesive bonding the bottle to the base cup or label softens. Trying to return
Physical distortion occurs at the interface between the bottle and the base cup, and peeling starts from this interface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a bottle container 1 includes a bottle main body 10 made of a heat-resistant resin formed by blow molding.
And a bottle fixed material such as a label 15 and a base cup 18 fixed to the surface of the bottle main body 10 via an adhesive.

The bottle body 10 is a container made of a heat-resistant resin such as polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), and formed by blow molding. Blow molding is a process in which a parison injection-molded or extruded parison of thermoplastic plastic that has been softened by heating is inflated using air pressure or the like in a mating mold, and is brought into close contact with the mold and simultaneously cooled to obtain a hollow body. Is the way.

[0009] The cylindrical bottle body 1 formed in this manner.
The label 15 and the base cup 18 are fixed to the body and the bottom of the “0” via an adhesive, respectively. As the material of the label 15, paper, polyethylene, polypropylene, polyvinyl chloride, polyester or the like base material can be used alone or as a composite laminate.
It is preferable to use a rigid material such as paper, paper / polyethylene laminate or the like which does not deform thermally. As an adhesive for attaching the label, an adhesive material that starts softening at a temperature lower than the shrinkage start temperature of the bottle body 10 caused by heating is used. More specifically, an acrylic resin-based emulsion adhesive, Kanebo NSC Co., Ltd. Instaloc MP-7918, and the like can be given. These adhesives usually initiate thermal deformation in the range of 80-120 ° C.

On the other hand, the base cup 18 is
Used to maintain zero independence and protect the bottom,
Its shape is a tubular or container-like shape that completely wraps the bottom of the bottle body 10. As a material of the base cup 18, polyethylene, polypropylene, or the like is used. As the adhesive for attaching the base cup 18, a material that starts softening at a temperature lower than the shrinkage initiation temperature of the bottle body 10 caused by heating, as in the case of attaching the label, is used. More specifically, an acrylic resin-based emulsion adhesive, Kanebo NS
C. Instant Lock No. 434-2783 and the like.

Next, a description will be given of a method of peeling off the bottle fixed matter (label, base cup) adhered to the bottle body 10 with the adhesive as described above. First, the bottle with the bottle fixed is placed in a hot air oven or hot water and heat-treated. The heat treatment is performed at an operating temperature at which the bottle body made of a heat-resistant resin thermally shrinks and the adhesive bonding the bottle body made of the heat-resistant resin to the bottle fixed material softens. That is, the temperature condition is 80 to 24.
The temperature is set to 0 ° C, more preferably 80 to 200 ° C. If this value is less than 80 ° C., there is a disadvantage that the heat shrinkage of the bottle is small and the peeling of the label is incomplete. The disadvantage of softening occurs. The processing time is about 15 seconds to 300 seconds.

By this operation, the bottle body thermally shrinks to return to the parison shape before blow molding. Due to this thermal shrinkage, peeling of the bottle-fixed matter from the bottle body starts.
Hereinafter, the present invention will be described in more detail by showing more specific experimental examples.

EXPERIMENTAL EXAMPLE 1 Using a vinyl acetate resin-based emulsion (softening temperature: 100 ° C.) as an adhesive, a label made of a polypropylene (PP) / paper laminated base material (adhesion surface is paper side) was blow-molded to form a P.
It adhered to the body surface of the ET bottle. After the adhesive was sufficiently dried, the bottle was placed in a hot air oven at 200 ° C. for 60 seconds, and the PET bottle body began to shrink to return to the shape of the parison before blow molding.
Slight peeling of the label from the PET bottle body was confirmed.

EXPERIMENTAL EXAMPLE 2 Using an ethylene-vinyl acetate resin-based hot melt adhesive (softening temperature: 120 ° C.) as an adhesive, polypropylene (P)
The label consisting of P) was adhered to the surface of the body of the blow-molded PET bottle. After the adhesive was sufficiently dried, the bottle was placed in a hot air oven at 200 ° C. for 60 seconds, and the PET bottle body began to shrink in order to return to the parison form before blow molding. , Slight peeling of the label was confirmed.

Experimental Example 3 An injection-molded polyethylene base cup was bonded to the bottom of a blow-molded PET bottle using an ethylene-vinyl acetate resin-based hot melt adhesive (softening temperature: 150 ° C.) as an adhesive. After the adhesive was sufficiently dried, the bottle was placed in a 200 ° C. hot air oven for 60 seconds.
Prior to blow molding, the body of the PET bottle began to shrink trying to return to the parison form, and this shrinkage confirmed slight detachment of the base cup from the PET bottle body.

[0016]

The effects of the present invention are clear from the above experimental results. That is, the present invention separates the bottle-fixed object from a bottle container including a bottle body made of a heat-resistant resin formed by blow molding and a bottle-fixed object fixed to the surface of the bottle body via an adhesive. How to
The bottle body heat shrinks, and the bottle body and the bottle
Heat treatment at the operating temperature at which the adhesive that bonds the
The parison before blow molding.
The heat shrink force that tries to return to the shape can be used.
As a result, the bottle sticks can be easily and reliably removed from the bottle body.
Can be peeled.

[Brief description of the drawings]

FIG. 1 is a front view of a bottle container of the present invention, and is a view in which a part is sectioned.

FIG. 2 is a cross-sectional view showing a state where a label is fixed to the surface of the bottle main body via an adhesive.

FIG. 3 is a schematic front view schematically showing a state in which the bottle main body is thermally contracted and the adhered matter of the bottle is peeling off, and is a view in which a part is sectioned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 10 ... Bottle main body 15 ... Label 18 ... Base cup

Claims (4)

(57) [Claims] 1. A heat-resistant resin molded by blow molding.
And a glue on the surface of the bottle body.
Bottle container with a bottle-fixed object fixed through
A method for peeling the adhered matter of the bottle, wherein the method comprises heat shrinking the bottle body and removing the bottle body from the bottle body.
At the operating temperature at which the adhesive that bonds to the
By heat treatment, the bottle body is
Use the heat shrink force to return to the form of
A bottle characterized in that the adhered matter of the bottle is peeled from the main body.
A method for removing the adhered substance. 2. The bottle-fixed material has a container-like shape.
And a base cup fixed to the bottom of the bottle body.
2. The method according to claim 1, further comprising:
Release method. 3. The bottle-fixed material is a sheet-like label.
2. The bottle fixing material according to claim 1, wherein
Peeling method . 4. The operating temperature is 80 to 240 ° C.
The button according to any one of claims 1 to 3, wherein
A method for removing the adhered substance.