JPH0691692A - Container and production thereof - Google Patents

Abstract

PURPOSE:To prevent the positional shift of a label and molding inferiority and to simplify a manufacturing process. CONSTITUTION:A label 5 composed of a heat shrinkable film formed into a cylindrical shape is externally fitted to a male mold 8 and shrunk under heating along the male mold 8 and, thereafter, the male mold 8 and the female mold 11 are closed so as to provide a predetermined gap 19 between the label 5 and the female mold 11. Next, a transparent or translucent molten resin material is injected in the gap 19 to form a container main body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for containing food and the like and a method for manufacturing the container.

[0002]

2. Description of the Related Art FIG.
As shown in (c), there is a container body 30 made of a synthetic resin with a label 31 attached to the outer peripheral surface of which is printed a character pattern or the like. The manufacturing method of this container 32 is, first, after forming the label 31 made of a film having heat shrinkability into a cylindrical shape,
The label 31 is fitted onto the preforming die 33, and the label 31 is further fitted.
By heat shrinking 31 along the preforming die 33, a preformed product 34 of the label 31 is produced (see FIG. 5A).

Next, the preform 34 is attached to the inner peripheral surface of the female die 36.
The mold 36 is closed with the female mold 36 and the male mold 37 in the state of being fitted in the 36a, and the molten resin is injected between the molds 36 and 37 through the injection passage 38 of the female mold 37 in the mold closed state. It is injected to form the container body 30.

[0004]

However, in the conventional manufacturing method described above, the label is preliminarily labeled with the preforming die 33.
31 is preformed, then preform 34 is preformed 33
Since the preform 34 and the female die 36 are fitted to the female die 36, a fitting error between the preform 34 and the female die 36 is likely to occur, which causes a misalignment of the label 31 or defective molding. It was

In the above container, the label 31 has a container body 30.
Since the label 31 is mounted on the outer peripheral surface, there is a risk that the label 31 may be inadvertently peeled off or even dropped off. In addition, the step of transferring the preform 34 from the preforming die 33 to the female die 36 is indispensable, so that the manufacturing process is complicated.

The present invention has been made in view of the above-mentioned problems of the prior art, and can prevent misalignment of labels and molding defects.
An object of the present invention is to provide a container and a manufacturing method thereof, which can simplify the manufacturing process.

[0007]

The present invention has been made as a container and a method for manufacturing the same in order to solve the above-mentioned problems. The characteristic of the method for manufacturing the container is that the heat-shrinkable film formed in a tubular shape. The label 5 consisting of
After the label 5 is heated and shrunk along the male mold 8, the male mold 8 and the female mold 11 are closed so that the label 5 and the female mold 11 have a predetermined gap 19, and then the transparent or A semi-transparent molten resin material is injected into the gap 19 to form the container body 3.

The container is characterized by a container body 3 made of a transparent or translucent synthetic resin material, and the container body 3
And a label 5 made of a heat-shrinkable film, which is provided on the inner peripheral surface side of the label. The outer surface of the label 5 facing the container body 3 is provided with characters, patterns, etc. is there.

[0009]

In the container manufacturing method of the present invention, the cylindrical label 5 is externally fitted to the male mold 8 and heat-shrinked in a close contact manner, and in that state, the male mold 8 and the female mold 11 are closed to remove the synthetic resin. Since the container body 3 is formed by pouring, the accuracy of the label 5 with respect to the molds 8 and 11 does not pose any problem, so that the container body 3 integrally provided with the label 5 can be formed. It does not cause molding failure.

Moreover, in the container of the present invention, since the container body 3 is transparent or translucent, the characters and the like written on the label 5 on the inner peripheral surface side can be visually observed.
Further, the container body 3 protects the label 5 and can prevent the label 5 from being peeled off or dropped off accidentally. Since the label 5 is printed on the outside of the label 5, the container body 3 Even if the contents contained in the food are food, the printing ink does not touch the food and is harmless.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a container for containing food, for example, and the container 1 is a container body 3 made of synthetic resin.
And a heat-shrinkable label 5 attached to the inner peripheral surface 3a of the container body 3.

The container body 3 is made of a synthetic resin material such as polypropylene, polyethylene, polystyrene and polyvinyl chloride, and is formed by injection molding so as to have a predetermined rigidity.

The label 5 is made of, for example, a uniaxially stretched polypropylene synthetic resin film 6 having a heat-shrinking property, and is a label having a print 7 of characters, a pattern or the like on the outer surface facing the container body 3. . If the container body 3 and the label 5 are made of the same material such as polypropylene or the printing ink has adhesiveness, the adhesive resin layer 17 for bonding the label 5 and the container body 3 is Although not necessary, if the container body 3 and the label 5 are made of different materials, or if the ink layers are provided on the entire surface of the label 5 even if both are the same type of resin, the label 5 and the container body 3 An adhesive resin layer 17 for adhering and is required.

An embodiment of the present invention has the above-mentioned configuration,
Next, the manufacturing method will be described. First, Fig. 2 (a)
As shown in FIG. 2, both edges of the film 6 are joined to produce a tubular label 5 in advance, and then the tubular label 5 is externally fitted to the male die 8. Next, when the label 5 is heated by, for example, a device that blows hot air or a heating device 9 that is a heater, the label 5 is brought into close contact with the male mold 8 and contracts without wrinkles and slack.

Next, the male mold 8 and the female mold 11 having the heat-shrinkable label 5 are brought close to each other to close the mold. In this manner, in the mold closed state, a predetermined gap 12 is provided between the label 5 and the inner peripheral surface 11a of the female mold 11, and the resin material in a molten state is injected into the gap 12 of the female mold 11. Injected through
The container body 3 is integrally formed with the label 5 (see FIG. 2).
See (c)).

FIG. 3 shows another embodiment of the present invention. In the above embodiment, after the label 5 is heat-shrinked along the male mold 8,
In contrast to the mold closing, in this embodiment, the label 5 is heat-shrinked simultaneously with the mold closing. That is,
The female die 11 is integrally provided with a heating device 9 so that the label 5 is heated when the female die 11 and the male die 8 approach each other. Therefore, in this way both types 8,11
Since the label 5 is heated at the same time when the two are brought close to each other, the working time can be further shortened.

Further, the mold closing of the both molds 8 and 11 is performed in the left-right direction,
Although it can be performed in any direction such as the vertical direction, as shown in FIG. 4, the male mold 8 is arranged upward and the female mold 11
Is moved from above, and the cylindrical label 5 is fitted onto the male die 8 and the upper surface 8a of the male die 8 has an arbitrary shape such as a circle with characters or the like printed on the outer surface side. Auxiliary label
Place 15. When the label 5 is heated and contracted, its one end 5a protruding from the male mold 8 is heat-sealed or adhered to the auxiliary label 15 with a heat-sensitive adhesive.

As described above, by providing the auxiliary label 15 on the bottom of the container body 3, there is an advantage that characters or the like can be displayed on the entire surface of the container body 3. The auxiliary label 15 may be attached to the outside of the one end 5a after the label 5 is heated and shrunk as shown in FIG. 4B, instead of being provided inside the label 5 as described above.

The present invention is not limited to the above embodiment, and the label 5 is not limited to a heat-shrinkable polypropylene film, but may be a heat-shrinkable material such as polystyrene, polyester, polyethylene or polyvinyl chloride. A film having a property may be used, or a foamed film made of such a material may be used to add a heat insulating effect.

Further, the label 5 may be a multilayer film in which films made of the above materials are appropriately combined. Moreover, by arbitrarily setting the shape of the female mold 11, the inside shape and the outside shape of the container body 3 can be formed to be different, and as shown in FIG. It is possible to provide the leg portions 19 or form the surface of the container body 3 in an uneven shape.

[0021]

EFFECT OF THE INVENTION Since the method for producing a container of the present invention is configured as described above, the cylindrical label is fitted onto the male mold and heat-shrinked in a close contact, and in that state, the male mold and the female mold are attached. Because the container body is formed by closing and and injecting synthetic resin,
It is possible to omit a step of removing the preformed product from the preforming mold and mounting it on the forming mold after preliminarily molding the one-end label with the preforming mold as in the conventional case. Therefore, the manufacturing process can be simplified and the productivity can be improved.

Moreover, since the container body is molded in a state where the label is contracted to the male mold, there is no problem in the accuracy of the label mold as a preformed product as in the conventional case, and there is no positional deviation of the label and Molding defects can be prevented.

Moreover, in the container of the present invention, since the container body is transparent or translucent, the characters and the like written on the label on the inner peripheral surface side can be visually observed and the inside of the container body can be seen. Since the label is provided, the label does not come off or fall off.

Further, since the label is printed on the outside of the label, it is harmless even if the content contained in the container body is food.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a sectional view of a container and (b) is a sectional view of the relevant part.

FIG. 2 shows an embodiment of the present invention, in which (a) is a cross-sectional view of a label fitted onto a male mold, (b) is a cross-sectional view of a label in which heat shrinks, and (c) is a mold closure. Sectional drawing of a state.

FIG. 3 is a sectional view showing another embodiment of the present invention.

4A and 4B show another embodiment of the present invention, in which FIG. 4A is a cross-sectional view of the label externally fitted to the male mold, FIG. 4B is a cross-sectional view of the label after heat shrinkage, and FIG. FIG.

FIG. 5 shows a conventional example, (a) is a cross-sectional view during preforming,
(B) is a cross-sectional view at the time of molding, and (C) is a perspective view of the container including a partial cross-section.

[Explanation of symbols]

 3 ... Container body, 5 ... Label, 8 ... Male type, 11 ... Female type

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Claims (2)

[Claims] 1. A label (5) made of a heat-shrinkable film formed in a tubular shape is fitted onto a male die (8), and the label (5) is heat-shrinked along the male die (8). After that, the male mold (8) and the female mold (11) are closed so that the label (5) and the female mold (11) have a predetermined gap (19), and then the transparent or translucent melting is performed. A method of manufacturing a container, characterized by injecting a resin material into the gap (19) to form a container body (3). 2. A container body (3) made of a transparent or translucent synthetic resin material, and a label (5) provided on the inner peripheral surface side of the container body (3) and made of a heat-shrinkable film. A container comprising the label (5), wherein an outer surface of the label (5) facing the container body 3 is printed with characters, patterns and the like.