JP7104876B2 - Container and labeling method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container filled with, for example, a viscous content, and more particularly to a container having a panel attached with a label. Furthermore, it relates to a method of labeling the container.

BACKGROUND ART As containers filled with viscous contents such as mayonnaise, ketchup, and various sauces, resin containers having a certain degree of flexibility are widely used.

For example, in Patent Document 1, a container body containing a viscous material having fluidity is formed integrally with the container body, and formed to stand upward from the upper part of the container body, at least a part of A viscous object storage container is disclosed which has an upright wall forming a mouth portion having a contour of a predetermined shape including a straight line.

JP 2015-143130 A

By the way, in this type of container, it is common to attach a label to the body to indicate the contents and the source. For this type of container, the hot-filling, sealing, and labeling steps are often performed in series. In this case, if a flat surface (panel surface) is formed on the body of the container and the label is attached to this surface, the label can be attached smoothly. Attaching the label is

However, if an adhesive label is attached to the panel surface in an automatic line for high-temperature filling, for example, there is a problem that label attachment failure occurs. On the panel surface, expansion due to high-temperature filling and dents due to deformation under reduced pressure occur, so there are concerns about poor adhesion and peeling after cooling, making it difficult to apply labels.

SUMMARY OF THE INVENTION The present invention has been proposed in view of such conventional circumstances, and provides a container that does not cause defective attachment or peeling when a label is attached, and does not cause poor appearance. It is an object of the present invention to provide a labeling method.

In order to achieve the above object, the container of the present invention is a container formed of a flexible resin, having a flat body portion, a substantially flat panel portion, and a A container to which a label is attached, wherein a concave portion is provided in the body portion, the bottom surface of the concave portion is a flat surface, and the panel portion is defined as the panel portion, and the thickness of the panel portion is 0.40 mm to 0.4 mm. 46 mm, and the thickness of the panel portion is smaller than that of the other portions.

Further, the labeling method of the present invention is characterized by filling the container with the contents at a high temperature, affixing the label to the panel section in the expanded state of the container, and then cooling.

As mentioned above, if an adhesive label is attached to the panel surface on an automatic line that performs high-temperature filling, there is a concern that the label may be attached poorly or peeled off after cooling because expansion due to high-temperature filling and dents due to deformation under reduced pressure occur. . As a countermeasure, it is conceivable, for example, to make the panel surface thicker, but if the panel surface is made thicker to suppress deformation, the rigidity becomes excessively large, which deteriorates the squeezability and creates a recess. Label attachment failure on the line tends to occur due to the panel surface not expanding.

In the present invention, the thickness of the panel portion is set to be smaller than the thickness of the other portions, and is set to an appropriate thickness, so that deterioration of squeezability and occurrence of label sticking failures can be reliably suppressed.

According to the present invention, when a label is attached, there is no sticking failure or peeling, and no appearance defect occurs. Moreover, good squeezability is maintained.

1 is a schematic front view of a container according to an embodiment of the invention; FIG. FIG. 2 is a cross-sectional view taken along line AA of FIG. 1; The cross-sectional shape of the container is shown at (A) at normal time, (B) at high temperature filling, and (C) at time of cooling of the container. It is a figure which shows the sticking process of a label.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates in detail, referring drawings for embodiment of the container and label sticking method to which this invention is applied.

FIG. 1 is a front view of a container 1, and the container 1 exemplified in this embodiment is a container filled with viscous contents such as mayonnaise, ketchup, and various sauces. As for its form, it comprises a trunk portion 2, a mouth portion 3, and a shoulder portion 4. A cylindrical mouth portion 3 is positioned above the trunk portion 2 with the shoulder portion 4 interposed therebetween. is sealed by attaching a cap.

Although the method for manufacturing the container 1 is arbitrary, blow molding is preferred. Further, regarding the material constituting the container 1, the container 1 of the present invention must have squeezability and is made of a resin that is somewhat flexible. Specifically, for example, polypropylene is suitable, and the container 1 is mainly made of polypropylene.

The container 1 may have a multilayer construction, in which case it preferably has a polypropylene layer. For example, from the inside of the container 1, four layers of an inner layer, a barrier layer, a repro layer, and an outer layer are laminated in order, and an adhesive layer is provided between each layer for adhesion, so that the container has a total of six layers. In the case of , the outer layer and the inner layer are preferably polypropylene layers. As a result, the squeezability of the container 1 is improved.

The barrier layer is formed of a resin having high gas barrier properties. Gas barrier resins include, for example, ethylene-vinyl alcohol copolymer resins, polyamide resins, saturated polyester resins, etc. Among them, it is preferable to use ethylene-vinyl alcohol copolymer resins.

The container 1 has a so-called flat shape, and in the case of the container 1 of this embodiment, its cross-sectional shape is rectangular as shown in FIG. That is, the dimension in the width direction of the container 1 is larger than the dimension in the thickness direction. The flattened shape is not limited to a rectangular shape, but may be defined as having different dimensions in mutually orthogonal directions, such as an elliptical cross-section or an elliptical cross-section.

In the container 1 of the present embodiment, the panel portion 5 is formed as a flat surface on the wide surface of the body portion 2, and the label 6 is attached here. The panel portion 5 is formed so as to constitute the bottom surface of the recess 7 provided in the body portion 2, and also functions as a pressure reduction absorption panel.

Here, in the container 1 of the present embodiment, by setting the wall thickness of the panel portion 5 to an appropriate value, it is possible to eliminate label sticking failures and label peeling and to maintain squeezability. Specifically, the thickness t1 of the panel portion 5 is set to 0.45±0.05 mm, that is, 0.40 mm to 0.50 mm, and the panel portion 5 has reduced pressure deformation characteristics, squeeze properties, restorability, label It is designed to have good adhesion.

When attaching an adhesive label to the panel surface in an automatic line that performs high-temperature filling, if the wall thickness of the container is thicker than the set value, the squeezing performance will deteriorate or the label will not adhere properly. Deterioration of restorability and decompression deformation cause appearance defects and label peeling. If the body panel surface is made thicker to suppress deformation, squeezability deteriorates due to excessive rigidity, and label attachment failure on the line due to the recessed panel portion not expanding. is likely to occur. On the other hand, if the thickness of the panel surface is reduced, deterioration of restorability after squeezing and excessive decompression deformation after cooling of the container may cause appearance defects and label peeling.

FIG. 3 shows changes in the shape of the container 1. Normally, the panel portion 5 is flat as shown in FIG. , the panel portion 5 expands due to the expansion. FIG. 4 is a diagram for explaining a labeling process in an automatic line, in which a label 6 supplied by a pair of rollers 11 and 12 is adhered to the panel portion 5 that has expanded due to high-temperature filling.

At this time, if the panel portion 5 is made too thick, the expansion will be small, and when the container is cooled after the label 6 is attached, the panel portion 5 will become concave, and attachment failure will easily occur.

On the other hand, if the thickness t1 of the panel portion 5 is set to 0.40 mm to 0.50 mm, such inconvenience will not occur. That is, there is no deterioration of squeezability or label attachment failure, and deterioration of restorability after squeezing or deterioration of appearance or label peeling due to deformation under reduced pressure does not occur.

The thickness t2 of the portion other than the panel portion 5 of the body portion 2 is arbitrary, but if it is thick, the squeezing property is deteriorated, and if it is thin, the drop resistance is deteriorated. Therefore, it is preferable that the minimum thickness t2 of the side surface of the body portion 2 not having the panel portion 5 is 0.51 mm or more. More preferably, it is 0.70 mm to 0.80 mm. As a result, good squeezability is maintained, drop resistance is good, and cracks do not occur in the drop test.

As described above, the present invention finds the optimum wall thickness condition for obtaining a container having excellent deformation characteristics under reduced pressure, squeezing property, resilience, labeling property, and the like. By setting the wall thickness as described above, it is possible to provide a container that does not cause defective attachment or peeling when the label is attached, and does not cause poor appearance.

Although the embodiments to which the present invention is applied have been described above, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. is.

Next, examples of the present invention will be described based on specific experimental results.

Examples 1-4, Comparative Examples 1-4
Containers with different thicknesses for the panel and body were molded by blow molding. The weight of each molded container was approximately the same, and the depth of the panel was greater at the top (1.4 mm) than at the bottom (0.6 mm) and decreased from top to bottom. . Tables 1 to 8 show the measured thickness of each container. Table 1 is the measured value of Example 1, Table 2 is the measured value of Example 2, Table 3 is the measured value of Example 3, Table 4 is the measured value of Example 4, and Table 5 is the measured value of Comparative Example 1. Table 6 shows the measured values of Comparative Example 2, Table 7 shows the measured values of Comparative Example 3, and Table 8 shows the measured values of Comparative Example 4.

The measurement positions of the thickness of the container are 14 points (1 to 14) set by dividing the area from the bottom to the vicinity of the shoulder above the panel except for the mouth at equal intervals, and the upper part of the panel (axial direction The label was affixed to the area above the center of the panel from the top edge of the panel. Positions 7-11 correspond to the panel portion to which the label is attached. In each table, PL90-1 and PL90-2 are the molding surfaces corresponding to the panel portion, and PL-1 and PL-2 are the measured values of the molding surfaces corresponding to the side surfaces.

Evaluation The containers of Examples and Comparative Examples were evaluated as follows. Regarding the label, the position of attaching the label was random on the front and back sides.
1. Evaluation of label peeling ・Test method After filling 270 cc of water (sauce is also acceptable) at 85°C into a container with a capacity of 282 cc, seal it with an aluminum seal and attach a label. After adhering, it was allowed to cool to room temperature. The degree of label peeling after standing to cool was checked.
・Confirm 10 evaluation criteria,
No peeling or floating: ○
With float (less than 3 x 3 mm): △
With float (3 x 3 mm or more): ×
With peeling: ×

2. Evaluation of impact resistance - Room temperature drop test After filling 300 g (approximately 270 cc) of a liquid source at 85°C into a container with a capacity of 282 cc, the container was capped with an aluminum seal. After being stored at normal temperature for one day, it was dropped vertically and horizontally from a height of 1 m a total of 10 times, and cracking of the container was confirmed.
· Evaluation criteria N = 10 No cracks: ○
Cracked: ×
・Low temperature (severe) drop test After filling 300 g (approximately 270 cc) of 85°C liquid sauce into a container with a capacity of 282 cc, it is capped with an aluminum seal. After being stored at -5°C for a day, it was dropped vertically and horizontally from a height of 1.5m a total of 20 times, and cracking of the container was confirmed.
· Evaluation criteria N = 10 No cracks: ◎

Table 9 shows the results. By setting the wall thickness of the panel portion within the range of 0.40 mm to 0.50 mm, there is no peeling of the label and good impact resistance is obtained.

1 Container 2 Body 3 Mouth 4 Shoulder 5 Panel 6 Label 7 Recess

Claims (7)

A container made of flexible resin,
A container having a flat body shape, a substantially flat panel portion, and a label attached to the panel portion,
A concave portion is provided in the body portion, and the bottom surface of the concave portion is a flat surface and is the panel portion,
The panel portion has a thickness of 0.40 mm to 0.46 mm,
A container, wherein the wall thickness of the panel portion is smaller than the wall thickness of the other portions. 2. The container according to claim 1 , wherein the minimum wall thickness of the non-paneled sides is 0.51 mm or more. 3. The container according to claim 1 , wherein said panel portion functions as a vacuum absorbing panel. 4. The container according to any one of claims 1 to 3, wherein the container is made mainly of polypropylene. 5. A container according to claim 4 , which is a multilayer container having a polypropylene layer. 6. A container according to any one of claims 1 to 5, characterized in that it is a container molded by blow molding. A method of attaching a label, comprising: filling the container according to any one of claims 1 to 6 with a content at a high temperature, attaching a label to a panel portion of the container in an expanded state, and then cooling.

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