JPH057176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing flexible hollow containers containing liquids such as foods and medicines, and more specifically, to a method for beautifully and reliably attaching a label to the body. The present invention relates to a method for manufacturing a hollow container that is coated with water.

BACKGROUND OF THE INVENTION This type of hollow container has a label attached to its body to indicate the contents. There are two types of labels: those printed on paper and those printed on synthetic resin film. Labels printed on paper are attached to hollow containers with glue on the back, while labels made of synthetic resin are attached with glue or welded to the body of hollow containers during blow molding. I do things like that.

Therefore, the conventional manufacturing method for this type of hollow container is
A hollow container with a flat or quadratic curved surface for attaching a label to the body is hollow-molded, and a paper or synthetic resin label is attached to the label-attaching wall of the body as described above. After that, it is filled with contents such as food and sealed. This manufacturing method is often used when the content is food. Furthermore, when containing pharmaceuticals, methods are taken that take hygiene into account. In other words, the above-mentioned hollow container is blow molded, the hollow container is washed, the contents are filled and sealed with a cap, the hollow container is sterilized, and then a paper or synthetic resin label is attached to the body as described above. The label is pasted on the wall. The reason why the label pasting process is performed after sterilization is to protect the label from peeling, alteration, or deterioration due to moisture during sterilization.

Problems to be Solved by the Invention However, in the above-mentioned method, since the container is a flexible hollow container, when the contents are filled, the body bulges out, causing strain between the label and the wall on which the label is attached to the body. It becomes easy to peel off. In particular, when the contents are foods, they are filled at high temperatures, which causes large distortions and makes them easier to peel off. In addition, in the latter method, when the contents are filled, the body bulges out and forms a three-dimensional curved surface, so when a flat label is attached, radial wrinkles occur from the center of the label outward. do.
When such wrinkles occur, not only does the appearance become unsightly, but also the adhesion strength decreases, making it easy to peel off.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a hollow container with a label attached thereon, which does not cause wrinkles when the label is attached and has a beautiful appearance.

A hollow container with a label attached that does not cause distortion between the labeled wall of the body and the label even when filled with contents, and that does not easily peel off even after long-term use. to get.

The purpose is to

Means for Solving the Problems In order to achieve the above objects, the present invention is constructed as follows. In other words, a hollow container with a body, bottom, and mouth is blow-molded using a flexible synthetic resin with a bending modulus of 9000 kg/cm ² or less, and then the inside is filled with liquid content and the mouth is sealed. In the method for manufacturing a hollow container, the hollow container is sealed by a cylinder, and a label is attached to a label zone of the body. A label is attached to a surface that is substantially transformed into a flat or quadratic curved surface.

Effect Since the present invention is configured as described above, the label zone becomes a flat or quadratic curved surface when the label is attached, and the flat label can be brought into uniform contact with each part of the label zone. A hollow container with a label affixed thereto that does not cause wrinkles or uneven application can be obtained.

In addition, the bending elastic modulus (JISK7203) of the present invention is
Flexible synthetic resins of 9000Kg/cm2 or ^less include low-density polyethylene, ethylene-vinyl acetate copolymer polyolefin elastomers, polyurethane elastomers, polyamide elastomers, polyester elastomers, and blends mainly composed of these. A single layer or a laminate with other synthetic resins, with an overall flexural modulus of 9000.
Kg/ ^cm2 or less can be used.

In addition, the liquid contents of the present invention include liquid foods and medicines, and specifically include mayonnaise, dressing, ketchup, vinegar, soybean oil, edible oil, various sauces, miso, oil, mirin, soba soup, etc. This includes foods, electrolyte solutions such as physiological saline and distilled water, high-calorie solutions such as glucose solutions, other plasma substitute solutions, and intravenous medicines such as blood.

The quadratic surface of the present invention is a curved surface expressed by a quadratic equation regarding orthogonal coordinates x, y, and z, and includes ellipsoids, hyperboloids, paraboloids, except for the special cases of planes and points.
Alternatively, it is a conical or cylindrical surface with a quadratic curve as a conductor. Further, a cubic curved surface is a curved surface that extends in the three axis directions of x, y, and z, excluding planes and quadratic curved surfaces.

EXAMPLE An example of the manufacturing method of the present invention will be described based on the drawings for manufacturing an infusion container for intravenous injection.

First, as shown in FIG. 1, a parison 3 made into a tube by plasticizing and melting an ethylene-propylene random copolymer with an ethylene content of 8 mol % is extruded from a melting die 4 between split molds 1 and 2. Place it. This ethylene-propylene random copolymer has a flexural modulus of 4700 Kg/cm ² and a melt flow rate (JISK6758) of 2.5 g/10 min. Next, the divided molds 1 and 2 are tightened and pressure fluid is blown into the parison 3 to shape the cavities 1a and 2a recessed in the divided molds 1 and 2. After cooling, the split molds 1 and 2 are opened and taken out, unnecessary burrs are removed, and the molded body 5 shown in FIG. 2 is obtained.

The molded body 5 includes a body 6 having an oval cross-sectional shape, a bottom 7 formed at the lower end of the body 6, and a mouth 8 formed at the upper end of the body 6. 7a is the bottom 7
It is a hanging device that is integrally formed with. In the body part 6,
A label zone 9 for pasting a label is provided. Third
As shown in the figure, the label zone 9 forms a cubic curved surface that is concave inward, and the radius of curvature of its cross section is larger than that of the central part R ₁ on the upper side R ₂ and on the lower side (Fig. (not shown) is larger. The proportion of this recess is determined as appropriate depending on the amount of liquid content to be accommodated.
Selected.

Next, fill the contents from the mouth part 8 in an upright position, stop filling when the label zone 9 becomes a quadratic curved surface with a radius of curvature _R3 , and insert the mouth part 8 into the stopper 10.
to seal the hollow container. Thereafter, a label made of film-like polyester is glued to the label zone 9 to complete a hollow container with the label attached.

When in use, it is hung with the hanging tool 7a on top, and the needle is passed through the stopper 10.
It is dripped by back pressure due to the weight of the infusion. Since the hollow container has the label zone 9 recessed inward, the wall of the label zone 9 tends to move inward during dripping, resulting in a good dripping condition.

As shown in FIG. 4, the radius of curvature R ₃ of the label zone 9 before label attachment is close to the radius of curvature R ₂ of the upper side of the label zone 9 during molding. Moreover, this surface forms a cylindrical surface, that is, a quadratic curved surface, whose conducting wire is a quadratic curve with a radius of curvature _R3 . In the hollow container, the label zone 9 forms a quadratic curved surface extending vertically with a radius of curvature R ₃ , so that the film-like label can be brought into uniform contact with each part of the label zone 9 when pasting. This prevents wrinkles and uneven application.

In the above embodiment, the cross-sectional shape of the body in which the label zone is formed is elliptical, but the present invention can be widely used in square shapes such as rectangles, circles, etc. In particular, in the case of a body with a rectangular cross-sectional shape, it is preferable that the label zone at the time of pasting is a flat surface.In this case, the label zone of the container at the time of blow molding is a three-dimensional curved surface that is concave inward of the container. Make it.

Effects of the Invention Since the present invention is configured as described above, the label zone becomes a flat or quadratic curved surface when pasting, and the flat film-like label can be uniformly abutted on each part of the label zone. Therefore, wrinkles and uneven application do not occur.

[Brief explanation of drawings]

Figures 1 and 5 illustrate an embodiment of the present invention. Figure 1 is a side view illustrating the process of blow molding, Figure 2 is a side view of the molded product, and Figure 3 is the same as above. FIG. 4 is a side view of the hollow container with a label attached thereto, and FIG. 5 is a view seen from section B-B of the same.

Claims (1)

[Claims] 1 A hollow container having a body, a bottom and a mouth is blow-molded from a flexible synthetic resin with a bending modulus of elasticity of 9000 kg/ ^cm2 or less, and then the inside is filled with liquid content and the mouth is sealed. In a method for manufacturing a hollow container in which a hollow container is sealed and a label is attached to a label zone of the body, the hollow container is blow-molded and has a label zone having a cubic curved surface recessed inward, and then the label zone is substantially sealed. A method for manufacturing a hollow container with a label attached thereto, characterized in that the label is attached to the container by deforming it into a flat or quadratic curved surface.