JPH01114413A - Manufacture of hollow container with label stuck on - Google Patents

Abstract

PURPOSE:To make a label free from wrinkling and uneven application to a hollow container with a specific curved surface, by making the specific curved surface a plane when the label is stuck. CONSTITUTION:A hollow molding is performed to form a hollow container 5 with a label zone 9 of a cubic curved surface protruding inward in a hollow body. Then a content is filled in to container 5 through an opening 8 in an erect state. When the label zone 9 has had a quadratic curve of a radius of curvature R3, the filling is stopped, and the opening 8 is sealed with a plug 10 to seal the hollow container 5. Then a filmlike label 11 is pasted on the label zone 9 to complete a hollow container with a label 11 stuck on. As the label zone 9 becomes a plane when the label is stuck, the label 11 is uniformly abutted on the label zone 9. Accordingly, neither wrinkage of the label 11 nor its uneven application occurs.

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 pharmaceuticals. 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 affixed 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 wear them.

Therefore, the conventional manufacturing method for this type of hollow container is to blow-mold a hollow container with a flat or quadratic curved surface on which the label is attached to the body, and then attach a paper or synthetic resin label to the printing part as described above. The label is pasted on the wall. 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 consideration. In other words, the above-mentioned hollow container is hollow-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 off, alteration, or deterioration due to moisture during sterilization.

Problems to be Solved by the Invention However, in the former method, when the contents are filled, since the container is a flexible hollow container, the body bulges out, causing distortion 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 wrinkles occur in this way, they not only make the appearance unsightly, but also
There is also the problem that the adhesion strength decreases and it becomes easy to peel off.

Therefore, the present invention provides (1) to obtain a hollow container with a label affixed thereon that does not cause wrinkles when the label is affixed and has a beautiful appearance;

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

The purpose is to

Means for Solving the Problems In order to achieve the above objects, the present invention is constructed as follows. That means the bending modulus is 9000 kg/an! A hollow container having a body, a bottom and a mouth is molded from the following flexible synthetic resin, and then the inside is filled with liquid contents and the mouth is sealed to seal the hollow container. A method for manufacturing a hollow container in which a label is attached to a label zone includes blow-molding a hollow container having a label zone having a cubic curved surface recessed inward,
Next, the label zone is transformed into a substantially flat or quadratic curved surface and the label is applied.

Function 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, thereby eliminating wrinkles and the like. It is possible to obtain a hollow container to which a label is affixed without causing uneven affixing.

The flexural modulus (JISK7203) of the present invention is 90.
00 kg/aa or less flexible synthetic resins include low density polyethylene, ethylene vinyl acetate copolymer polyolefin elastomer, polyurethane elastomer, polyamide elastomer, polyester elastomer, and blends mainly composed of these. A single layer or a laminate with other synthetic resins having an overall flexural modulus of 9000 kg/ad or less can be used.

In addition, the liquid contents of the present invention include liquid foods and pharmaceuticals, and specifically include mayonnaise, dressing, ketchup, vinegar, soy sauce, edible oil, various sauces, miso, oil,
This includes foods such as mirin and soba soup, 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 an ellipsoid, a hyperboloid, a paraboloid, or a quadratic curve, excluding the special cases of planes and points. It is a conical or cylindrical surface with a conducting wire. Furthermore, a cubic surface is a curved surface that extends in the three axis directions of X, y, and 2, excluding planes and quadratic surfaces.

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

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 a split mold 1.2. Place it.

This ethylene-propylene random copolymer has a flexural modulus of 4.700 kg/cd and a melt flow rate of 4.700 kg/cd.
) (JISK675B) is 2,5 g/10m
1n. Next, the split mold 1.2 is tightened and pressure fluid is blown into the varimen 3 to shape the cavities 1a and 2a recessed in the split mold 1.2. After cooling, the split mold 1.2 is opened and taken out, and unnecessary particles are removed to obtain the molded body 5 shown in FIG. 2.

The molded body 5 includes a body 6 having an oval cross-sectional shape and a body 6 having an oval cross-sectional shape.
It is composed of a bottom part 7 formed at the lower end of the body part 6 and a mouth part 8 formed at the upper end of the body part 6. 7a is a hanging tool integrally formed on the bottom part 7. The body part 6 is provided with a label zone 9 to which a label is attached. As shown in FIG. 3, the label zone 9 forms a cubic curved surface that is concave inward, and the radius of curvature of the cross section is larger on the upper side (R1) than on the central part (R1).
R1) and the lower side (not shown) are larger. The proportion of this recess is determined as appropriate depending on the amount of liquid content to be accommodated.
Selected.

Next, contents are filled from the mouth part 8 in an upright state, and filling is stopped when the label zone 9 becomes a quadratic curved surface with a radius of curvature R1, and the mouth part 8 is sealed with the stopper 10. 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, the infusion is hung with the hanger 7a facing upward, and a needle is passed through the stopper 10, and the infusion 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 R1 of the label zone 9 before label attachment is close to the radius of curvature Rχ of the upper side of the label zone 9 during molding. Furthermore, 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 has a radius of curvature R1
Since a quadratic curved surface is formed vertically, the film-like label can be brought into uniform contact with each part of the label zone 9 during application, and wrinkles and uneven application will not occur. There isn't.

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. Particularly 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 flat; 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 pasted, and the flat film-like label can be uniformly abutted on each part of the label zone. Therefore, wrinkles and uneven adhesion do not occur.

[Brief explanation of the drawing]

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. View from section A-A of
FIG. 4 is a side view of the hollow container with a label attached thereto, and FIG. 5 is a view taken from section B--B of the same.

Claims (1)

[Claims] 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/cm^2 or less, and then the inside is filled with liquid content and the mouth is sealed. A method for manufacturing a hollow container in which the hollow container is sealed and a label is attached to the label zone of the body, the method comprising: blow-molding the hollow container with a label zone having a cubic curved surface recessed inward;
1. A method for manufacturing a hollow container with a label attached thereto, characterized in that the label zone is then transformed into a substantially flat or quadratic curved surface and the label is attached.