JPH02147319A - Manufacture of liquid container - Google Patents

Abstract

PURPOSE:To dispense with a label bonding process by preliminarily arranging a label to the surface of either one of the cavities of split molds and introducing a pressure fluid into a parison under pressure to perform blow molding and integrally welding the label to the surface of a hollow container. CONSTITUTION:A label 3 is formed from a polypropylene sheet coated with a membrane composed of polyethylene or polypropylene having an m.p. of 115 - 170 deg.C on the side of a parison. The label 3 is arranged to the cavity 2b of split molds 1 in a close contact state and a parison 5 composed of straight chain medium density polyethylene melted under heating is arranged between the split molds 1 from an extrusion die 4. Subsequently, the split molds 1 are clamped and a fluid is introduced into the parison 5 under pressure to impart the shape of the cavity 2 of the molds to the parison 5 to perform the blow molding of a hollow container 6. Further, the hollow container is filled with an infusion from a mouth part 8 and hermetically sealed by a plug body 10 with a rubber plug to form an infusion container.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing a liquid container with a label welded to its surface, and more particularly, to a method for manufacturing a liquid container having a label welded to the surface thereof (more specifically, it relates to a method for manufacturing a liquid container having a label welded to its surface during blow molding). The present invention relates to a method for manufacturing a liquid container filled with a liquid that requires sterilization or sterilization treatment at high temperatures, such as cosmetics or food products.

[Prior art 1] This type of liquid container must be sterilized or sterilized at a temperature of 100°C or higher in order to maintain the hygiene of the container and liquid. The liquid container is heated to a high temperature of 100° C. or higher and placed in the processing tank to undergo high-temperature heat treatment, and this process is essential for this type of container. This heat treatment temperature is
The process varies depending on whether the treatment medium is steam or hot water and the type of microorganism to be sterilized or sterilized.
Inus) bacteria can be killed in 4 to 10 minutes at about 120°C, so 100 to 125
Processed at a temperature of ℃. By the way, as described in Japanese Unexamined Patent Publication No. 50-118888, the liquid container described above has a paper-bound label containing an explanation of the contents and how to use the contents, etc. on the wall of the body M. It is attached with adhesive. Since this attached label is easily peeled off by hot water or steam during sterilization or sterilization treatment, this label should be attached after sterilization or sterilization heat treatment as described in the above publication. ing.

[Problem to be Solved by the Invention 1] According to the above-mentioned prior art, the label is pasted after sterilization or sterilization. If it is not removed, labels cannot be attached, so the label attachment process cannot be performed immediately after the sterilization or sterilization process, and a drying process is required between these processes. In addition, the interval between them becomes long, resulting in poor efficiency.

The present invention was invented in view of the above points, and its objectives are: (1) Eliminating the label pasting process and eliminating the drying process for label pasting.

■The label will not peel off during the distribution process or during use.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows. The parison is suspended between the split molds, the split molds are clamped,
Pressurized fluid is injected into the parison to blow mold a hollow container, the inside of the hollow container is filled with liquid and sealed, and then
In a method for manufacturing a liquid container filled with liquid that is subjected to heat treatment above ℃, the label is placed on the cavity surface of a split mold in advance and then blow molded, whereby the label is placed on the surface of the hollow container during blow molding. This is a method for manufacturing a liquid container, characterized in that the label is made of a polypropylene sheet which is welded together and whose parison side is coated with a thin film of polyethylene or polypropylene having a melting point of 115 to 170°C.

[Function] In the present invention, a label is placed on the cavity surface of a split mold in advance and then blow molding is performed to form a hollow container with the label welded thereto, and a liquid is poured into the hollow container with the label welded thereon. Since heat treatment is performed after filling, the conventional complicated pasting process after liquid filling can be omitted, as well as the great advantage of omitting the drying process before the pasting process. Can be done. In addition, since the parison side of the label was coated with a thin film of polyethylene or polypropylene with a melting point of 115 to 170°C, the label would not peel off during heat treatment, and since the label was made of a polypropylene sheet, the above Labels shrink due to heat treatment.

Simulates deterioration of appearance such as swelling (no deformation occurs).

The polypropylene sheet of the label of the present invention refers to a homopolymer of propylene, ethylene and other components containing at most 10% of the polypropylene sheet.
It is a sheet of poly-10-pyrene such as a propylene copolymer containing mol%, and furthermore, a porous sheet made by chemically or physically processing this polypropylene has good printing characteristics on the sheet surface, Moreover, it is suitable because it has high heat resistance to heat treatment for sterilization or sterilization. In particular, clay, talc, diatomaceous earth with a particle size of 20J1- or less,
100 parts by weight of inorganic fillers such as silica, calcium carbonate, alumina, mica powder, titanium oxide, kaolin, zeolite, etc. are contained per 1 part by weight of polypropylene, and the material is stretched 2 to 5 times. The one that has been treated is good.

The thin film of polyethylene or polypropylene coated on the label of the present invention is a differential thermal scan,! The melting point measured with an octameter is 115 to 170°C, more preferably 120 to 150°C.
°C linear low-density polyethylene, orthogonal medium-density polyethylene, low-pressure high-density polyethylene or pomopolymers of propylene or propylene copolymers containing at most 20 mol% of ethylene, or polymers based on ethylene and propylene with maleic anhydride. It is a modified polyolefin graft-polymerized by et al.

[Implementation Example 1] Embodiments of the present invention will be described based on the drawings.

1 to 5 are explanatory diagrams of a method for manufacturing an infusion container, which is an embodiment of the liquid container of the present invention. l.

Reference numeral 1 denotes a split mold, which has a cavity 2.2 recessed in the shape of a hollow container on its surfaces that come into contact with each other. Cavity 2,
2 has cavities 2a, 2b, and 2C corresponding to the mouth, body, and bottom of a hollow container, respectively, and a label 3 is closely disposed in a part of the body cavity 2b. A parison 5 made of linear medium-density polyethylene heated and melted at 180° C. by an extrusion die 4 is placed between the tubes 1 and 1. Here, label 3 is 1 mol% ethylene
For 100 parts by weight of a copolymer of propylene with
The main layer 3aG:W is a porous polypropylene sheet mixed with 10% by weight of an inorganic filler with a particle size of 2011 layers or less and stretched at a stretching ratio of 2 to 3 times, and the parison 5 side of this label 3 was coated with a thin layer of linear medium density polyethylene having a melting point of 125°C. Note that the square portions 3-13°, . . . of the label 3 have an arc shape.

Next, the split mold 1.1 is clamped, pressure fluid is injected into the parison 5 using a blow bottle (not shown), and the shapes of the cavities 2, 2 are shaped, thereby blow molding the hollow container 6. do. This hollow container 6 is composed of a body part 7, a mouth part 8, and a bottom part 9, and a label 3 is welded to a part of the body part 7.

Furthermore, an infusion solution is filled through the opening 8 and sealed with a stopper 1O equipped with a rubber stopper, thereby forming an infusion container.

FIG. 4 shows the process of sterilizing an infusion container.

Reference numeral 11 denotes a high-pressure treatment tank, the inside of which is filled with hot water 12 at 110°C, which is maintained at a constant temperature of 110°C by a lower temperature holding device 13.

The infusion container 6 is immersed in the hot water 12. The sterilization process is completed by soaking for 30 minutes.

The parison to be subjected to blow molding is preferably made of basically transparent synthetic resin, such as linear low-density polyethylene, linear medium-density polyethylene, propylene random copolymer or propylene block containing at most 20 mol% of ethylene. Single layers of synthetic resins such as copolymers and ethylene ethyl acrylate, and multilayer ellipsoids made of these as main materials and laminated with synthetic resins with gas permeation resistance such as nylon, ethylene vinyl alcohol copolymers, polyvinylidene chloride, and acrylonitrile. A cadaver is preferred.

FIG. 6 shows an enlarged sectional view of the main part of the body of a food container according to another embodiment. The liquid container 7 has a structure in which linear medium density polyethylene is arranged on the inner layer 7a and outer layer 7b of the body, and an ethylene-vinyl alcohol copolymer is arranged on the intermediate layer 7c, and the above-mentioned example is formed on the body wall. This shows the label 3 used in the above welded. By forming the liquid container with a multilayer barrier structure in this manner, it is possible to prevent the quality of foods and infusions containing components such as amino acids in the internal liquid from deteriorating.

In the above embodiment, the time for immersing the infusion container 6 is 110
℃ for 30 minutes, but this treatment temperature was 100 to 12
Sterilization can be performed at a temperature of 5°C, but the processing time varies inversely with the temperature.
~60 min, 5-20 min processing time at 125°C is required. In this way, the processing time decreases in inverse proportion to the temperature, so even if the melting point of the thin M3b of the label 3 is below the heat treatment temperature, the label 3 does not soften to the extent that it peels off, and the heat treatment tank 13 It maintains sufficient welding force even within the interior.

Square portions 3-, 3- of label 3. Since the label 3 has an arc shape, even if the label 3 shrinks slightly when it is welded to the parison 5 during blow molding, it is possible to eliminate the appearance of discomfort.

It can be finished beautifully.

[Effects of the Invention] The present invention performs heat treatment after injecting a liquid into a hollow container to which a label is welded, thereby omitting the conventional tedious pasting process after filling the liquid. In addition, the parison side of the label is coated with a thin film of polyethylene or polypropylene with a melting point of 115 to 170°C, which has the great advantage of omitting the drying process before the pasting process. The label does not peel off during processing, and since the label is made of a polypropylene sheet, it has the dramatic effect of not shrinking, expanding, or deforming the label, which would deteriorate its appearance, even during heat treatment. It will be done.

[Brief explanation of the drawing]

1 to 5 show a method for manufacturing an infusion container, which is an embodiment of the liquid container of the present invention, in which FIG. 1 is a cross-sectional view showing the hanging state of the parison, and FIG. 2 is an outline of FIG. Enlarged sectional view,
FIG. 3 is a side view of the infusion container, FIG. 4 is an explanatory diagram showing the process of heat-treating the infusion container, FIG. 5 is an enlarged sectional view of the main part of the body of the infusion container, and FIG. 6 is the liquid of the present invention. FIG. 7 is an enlarged cross-sectional view of the main part of the body of a food container according to another embodiment of the container.

Claims (1)

[Claims] A parison is hung between the split molds, the split molds are clamped,
Pressurized fluid is injected into the parison to blow mold a hollow container, the inside of the hollow container is filled with liquid and sealed, and then
In a method for manufacturing a liquid container filled with liquid that is subjected to heat treatment above ℃, the label is placed on the cavity surface of a split mold in advance and then blow molded, whereby the label is placed on the surface of the hollow container during blow molding. A method for producing a liquid container, characterized in that the label is made of a polypropylene sheet that is welded together and whose parison side is coated with a thin film of polyethylene or polypropylene having a melting point of 115 to 170°C.