JPH0369425A - Manufacture of printed container - Google Patents

Abstract

PURPOSE:To avoid the intrusion of a liquid between a container and a label and the coming-loose of the label therefrom by fitting the cylindrical label consisting of the uniaxially stretched resin film having its inner adhesive side printed over the container whose outermost layer consists of a heat resisting resin layer. CONSTITUTION:A cylindrical label 2 consisting of the uniaxially stretched resin film having its inner adhesive side printed is fitted over a container 1 whose outermost layer consists of at least a heat resisting resin layer at a thermal deformation-causing temperature not below 80 deg.C. The cylindrical label is then heat sealed to the container under pressure wholly or partly (at a bottom part 4 or only its edge or the bottom part 4 or both the bottom and top edges) after or while being thermally shrinkably attached thereto. This method avoids the intrusion of a liquid between the container 1 and the cylindrical label 2 at the time of sterilization and the coming loose of the label 2 therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing heat-resistant printed containers that can be heat sterilized, such as boilers, cold brews, and the like.

(Prior art) Conventional printed containers for boilers and retorts include printed containers with curved surfaces printed on the container, and printed containers made by heat-shrinking and adhering labels made of shrink film printed on the inside and coated with adhesive. However, the former has problems with the heat resistance of the printing ink and the number of colors printed, making it impossible to print with a high-class feel, and the latter has problems with the heat resistance of the adhesive and the number of colors printed. There is a problem with the shrinkage force of the film, which often causes the label to peel off or shift during use.Also, if the label is too large, it will not stick to the bottom of the container stably. There are printed containers that are obtained by laminating the film with a printed film when it is in sheet form before being formed, then forming it into a container, but it is impossible to calculate the elongation of the printing and it is impossible to obtain stable printing. Met.

(Problems to be Solved by the Invention) As a result of studies aimed at improving the shortcomings of conventional printed containers, the present invention has been developed using a uniaxially stretched heat-shrinkable film having an inner side with a sealable adhesive printed on the main container. The present invention provides a method for producing a printed container, such as a boiler or a retort, which can be heated and sterilized, by heating and pressurizing the label after heat-shrinking the label or while heat-shrinking the label into close contact.

(Means for Solving the Problems) The present invention consists of a main body container made of a heat-resistant resin layer at least the outermost layer of which has a heat deformation temperature of 80° C. or higher, and a uniaxially stretched resin film on which an inner side with an adhesive is printed. After fitting the cylindrical labels and heat-shrinking them into close contact, or while heat-shrinking them into close contact, heat and press the whole or a part of the cylindrical labels (the bottom or only the bottom end, or the bottom or the bottom end and the top end). This is a method for producing a printed container characterized by being sealed.

The material of the main container may be polypropylene, polyester, polycarbonate, or heat-resistant polyvinyl chloride resin, but if particularly barrier properties are required, the outermost layer is the above resin and the middle layer is ethylene acetic acid. Preferably, the layer is a barrier resin layer such as a saponified vinyl copolymer or a polyvinylidene chloride resin, or a metal layer such as aluminum, and the innermost layer is made of a multilayer material such as a resin that can be sealed with the lid material.

The uniaxially stretched resin film used for the cylindrical label is preferably the same type of resin used for the outermost layer, but
Depending on the type of adhesive applied to the inside along with the printing, it can be used without particular care.

For example, a uniaxially stretched polypropylene film of 12 to 50 μm, a polycarbonate film, a polyester film, or when a heat insulating effect is required, a cylindrical label made of a polypropylene film that can be printed on the inside and laminated with foam shrinkage polypropylene is used.

General methods such as gravure and offset are used to print on the inside, and a general hot melt adhesive is applied to the entire or partially of the cylindrical label. be done. Further, the shrinkage rate and thickness of the film can be variously changed depending on the sterilization conditions such as boiling and retorting. Since the label is printed on the inside with adhesive, the printing ink will not peel off even when sterilized by boiling, retorting, etc. Also, since the material is a transparent film, the surface appearance is glossy and the product is easy to use. It became possible to increase the value. Furthermore, if it is necessary to add printing to the bottom of the main container, it is possible to attach a transparent resin film that is printed on the inside surface and has a heat resistance of 80°C or higher and can be sealed with heat and pressure to the cylindrical label. .

In addition, the position and conditions of the heating and pressure seal between the main container and the cylindrical label can be changed depending on the boiling and retort conditions, and the product value is that there is no intrusion of liquid during sterilization between the main container and the cylindrical label. You can get a high container.

(Example) An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, a multilayer sheet of polypropylene/saponified ethylene vinyl acetate copolymer/polypropylene is vacuum formed to have a bottom diameter of 55 mm and a bottom diameter of 42 mm.

Inner photo printing (3) on multi-layer main container (1) with a height of 79 mm
), and then ethylene vinyl acetate copolymer (EVA)
A cylindrical label (2) with a fold diameter of 89 mm and a length of 82 mm is made by sealing a transparent axially stretched polypropylene film with a thickness of 50 μ and a shrinkage rate of 50% at 100 ° C., which is coated with 5 μ of a hot melt adhesive. The bottom of the cylindrical label (4) and the main container (1) were attached at a temperature of 16,000°C.
Pressurize and seal for 1 second at
1) and the cylindrical label (2) were completely welded together to obtain a printed container.

After filling the printed container with contents such as water sheep mass, nylon/
After heat-sealing and sealing with an 80μ thick lidding film (5) made of a multilayer film such as polypropylene,
Even after retort sterilization at 120° C. for 20 minutes, it was possible to obtain a container (FIG. 4) that retained beautiful printing without any problems.

Further, as shown in Figure 3, a cylindrical label made of uniaxially stretched polypropylene film with a folded diameter of 89 mm and a length of 80 mm was attached to the main container (1) in the same manner as in Figure 2, and the label was left in an atmosphere of 100''C for 20 seconds. , the upper end of the cylindrical label (2) (
6) and the bottom end (7) for 1 second at 160°C to obtain a printed container, then filled with the contents, completely sealed with the same lidding film (5), and heated at 1000°C. When the container was sterilized in a hot vortex for 30 seconds, a container with no problems and high commercial value could be obtained.

Furthermore, when the main container (1) and the cylindrical label (2) to which no adhesive was applied were sealed under heat and pressure, the label was cut and destroyed, and a container with commercial value could not be obtained.

(Effects of the Invention) After filling the printed container according to the present invention with contents and completely sealing it with a lidding film, liquid will not enter between the main container and the label even if it is boiled or retort sterilized. Without,
In addition, there is no misalignment of the label, and it is possible to obtain a container with high commercial value that is free from all the defects of conventional printed containers.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a container according to the present invention, FIG. 2 is a cross-sectional view showing the manufacturing process of the present invention, FIG. 3 is a cross-sectional view of a container showing another embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view showing a state in which a container according to the present invention is filled with contents and heat-sealed with a lidding film.

Claims (1)

[Claims] (1) A cylindrical label made of a uniaxially stretched resin film with an adhesive-adhesive inner side printed is fitted onto a main container made of a heat-resistant resin layer at least the outermost layer of which has a heat distortion temperature of 80°C or higher, and heated. 1. A method for producing a printed container, which comprises heating and pressurizing the whole or part of the cylindrical label after shrinking or heat-shrinking the label.