JP2003191934A - Barrier plastic cup container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrier plastic cup container, which enhances barrier properties of the container, by reducing a joint of side-wall fusing parts of a barrier label for an insert to the utmost. <P>SOLUTION: In this plastic cup container having a square cross section with rounded corners, the barrier label 200 for the insert is precedently inserted for attachment into an injection mold; a container body is injection-molded; and concurrently to that, and the label 200 is thermally fused with an outer surface of a side wall of the container body and an outer surface of a bottom thereof. In terms of a developed shape of the label 200 to be used, one side-wall fusing part 211 is continuously provided on one side of a square rounded-corner bottom fusing part 220 in which a through-hole 230 for a gate is provided in a central position; and the three side-wall fusing parts 212, 213 and 214 except the fusing part 211 are continuously provided in an arc shape on one side of the fusing part 211 in sequence. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier plastic cup container used for contents such as dessert foods which particularly require barrier properties.

[0002]

2. Description of the Related Art Conventionally, as a plastic cup container used for contents requiring barrier properties, there are a cup container formed by molding a laminated barrier plastic sheet into a sheet and a cup container formed by injection molding with a barrier resin. But,
Since the former cup container is formed from a sheet on which characters or patterns for explaining the product are printed, the characters or patterns may be deformed and the design may be poor, and the container may have a large uneven wall thickness. In the latter cup container, the molding resin is expensive, and since the melt viscosity is high, a thin container cannot be formed and the container becomes thick, resulting in an increase in manufacturing cost. For this reason, many inventions and devices relating to imparting a barrier property to a plastic cup container have been made, for example, Japanese Patent Laid-Open No. 9-1745.
There has been known a barrier plastic cup container in which the barrier label for insert disclosed in Japanese Patent Publication No. 95 is heat-sealed to the side wall surface and the bottom surface.

[0003]

However, the above-mentioned barrier plastic cup container is one in which two separate barrier labels for insert are heat-sealed on the bottom surface and the side wall surface, and when the container body is molded. In some cases, the barrier label heat-sealed on the bottom surface may be displaced or wrinkles may occur, failing to exert a sufficient effect on the barrier property of the container. Separately from this, one barrier label for inserts in which the bottom fusion part and the side wall fusion part are continuous is provided in advance on the cavity surface forming the side wall and bottom of the female die of the injection molding die. There has been known a cell box style barrier plastic cup container in which a barrier label for insert is heat-fused to the side wall and the outer surface of the bottom of the container body at the same time of inserting and injection molding the container body. Barrier label (20) for inserts used for this barrier plastic cup container
As shown in FIG. 4 (a), the developed shape of 0) is such that the side wall fusion is performed on each of the four sides of the rounded corner square bottom fusion-bonding portion (220) having the gate through hole (230) at the central position. Dressing part (2
11, 212, 213, 214), or, as shown in FIG. 4 (b), four side wall fusion portions are formed on each of two opposite sides of the bottom fusion portion (220). (Half of 211, half of 212 and 213, half of 213 and half of 214 and 211) were connected in series. However, in the former, there are four joints of the fusion-bonded side wall, and in the latter, there are two joints, and the barrier property of the container may be deteriorated due to these joints.

The present invention solves the above-mentioned problems of the conventional barrier plastic cup container, and improves the barrier property of the container by minimizing the joints of the side wall fusion parts of the barrier label for insert. The present invention provides a barrier plastic cup container.

[0005]

That is, the first aspect of the present invention
In the invention of, the barrier label for insert is inserted in advance on the cavity surface forming the side wall and the bottom of the female mold of the injection molding die, and at the same time when the container body is injection molded, the side wall and the bottom of the container body are In a square plastic cup container with a horizontal cross-sectional shape having rounded corners for heat-sealing the barrier label for inserts on the outer surface, the developed shape of the barrier label for inserts is rounded with a through hole for a gate in the central position. One side wall fusion part is continuously connected to one side of the square bottom fusion part of, and the other three side wall fusion parts are sequentially connected to one side of the side wall fusion part in an arc shape. It is a barrier plastic cup container.

In a second aspect of the present invention, a barrier label for insert is previously attached to the cavity surface forming the side wall and the bottom of the female die of the injection molding die, and the container body is injection molded. At the same time, in the plastic cup container having a square cross-section with a horizontal cross-section in which the insert barrier label is heat-sealed to the side wall and the outer surface of the bottom of the container body, the developed shape of the insert barrier label is the center. One side wall fusion part is connected to one side of the bottom fusion part having a rounded corner having a through hole for a gate at a position, and one side wall fusion part is provided on each side of the side wall fusion part. The barrier plastic cup container is characterized in that the first portion and the other half of the side wall fused portion are connected in an arc shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the barrier plastic cup container of the present invention will be described in detail with reference to the drawings. FIG. 1 is a development view of a barrier label for insert of one embodiment used in the barrier plastic cup container of the present invention, and FIG. 2 is a development view of a barrier label for insert of another embodiment. And FIG.
FIG. 3A is a plan view of an example of a barrier plastic cup container, and FIG. 3B is a sectional view thereof.

The barrier plastic cup container (10) of the embodiment of the present invention is, as shown in FIG. 3 (a) or (b), a flange (130) and side walls (111, 1) from above.
12, 113, 114) and a bottom (120), and a barrier label (2
No. 00) is heat-sealed, and has a square horizontal cross section and an inverted trapezoid vertical cross section. Then, the method of heat-sealing the barrier label to the container body is such that the barrier label for insert is previously attached to the cavity surface forming the side wall and bottom of the female mold of the injection molding die,
From the gate position (G) on the injection molding machine, through the gate through hole (230) of the bottom fusion bonding part of the barrier label for insert into the mold cavity (the space between the female mold and the male mold in which the molded product is molded). A melt-molded resin is injected to injection-mold a container body, and at the same time, a barrier label for insert is heat-sealed to the side wall and the outer surface of the bottom of the container body. The molding resin used to mold the container body is a thermoplastic resin such as polypropylene, polyethylene, or polyethylene terephthalate that matches the intended use of the container.The barrier label for inserts is a barrier layer such as a silicon oxide deposited film. In the constituent layers and having a resin layer that is heat-sealed with the molding resin of the container body on the heat-sealing surface of the container body. In the container filled with the contents, the opening at the upper end of the container is covered with a sealing film having a barrier property, and the sealing film is peelably heat-sealed to the upper surface of the flange to seal it.

The barrier label for insert (2) of the embodiment used in the barrier plastic cup container of the present invention
As shown in FIG. 1, the developed shape of (00) is one side wall fusion part (211) on one side of the bottom fusion part (220) with a rounded corner having a through hole (230) for gate at the central position. ) Are continuously provided, and the other three side wall fusion-bonded portions (212, 213, 214) are sequentially provided in an arc shape on one side of the side wall fusion-bonded portion.

Further, as shown in FIG. 2, the developed shape of the barrier label for insert (200) according to another embodiment has a rounded square bottom having a gate through hole (230) at the central position. One side wall fusion part (211) is connected to one side of the fusion part (220), and another side wall fusion part and the other half of the side wall fusion part are respectively provided on both sides of this side wall fusion part. The parts (half of 212 and 213, half of 214 and 213) are connected in an arc shape.

The barrier label for inserts used in the barrier plastic cup container of the present invention is a wall in which four side wall fusion portions are connected in an arc shape to one side of the bottom fusion portion (220) having a rounded corner. Since the fusion-bonding parts are connected by arranging one side-wall fusion-bonding part in series, the side-wall fusion-bonding part of the insertable barrier label when heat-bonded to the side wall of the container body and the outer surface of the bottom. The number of joints is one, which is smaller than that of four or two in the case of the conventional barrier plastic cup container, and the deterioration of the barrier property of the container due to the joint of the side wall fusion part is extremely small. .

[0012]

EFFECTS OF THE INVENTION The barrier plastic cup container of the present invention has a small number of joints of the side wall fusion parts of the barrier label for inserts heat-sealed to the outer surface of the side wall, and the side wall fusion parts are aligned. The deterioration of the barrier property of the container caused by eyes is extremely small, and the barrier property is good.

[Brief description of drawings]

FIG. 1 is a development view of a barrier label for insert of an embodiment used in a barrier plastic cup container of the present invention.

FIG. 2 is a development view of a barrier label for insert of another embodiment used in the barrier plastic cup container of the present invention.

FIG. 3A is a plan view of an example of a barrier plastic cup container, and FIG. 3B is a sectional view thereof.

FIG. 4A is a development view of an example insert barrier label used in a conventional barrier plastic cup container, and FIG. 4B is a development view of another example insert barrier label. .

[Explanation of symbols]

10: Barrier plastic cup container 100: Container body 111, 112, 113, 114 ... Side wall 120 ... bottom 130: Flange 211, 212, 213, 214 ... Sidewall fusion bonding part 220 ... Bottom fusion part 230 ... Through hole for gate

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E033 AA08 BA15 BA16 BA18 BB08                       CA15 DA08 DD01 FA02                 4F206 AD08 AD09 AD24 AG03 AG07                       AH56 JA07 JB13 JF05

Claims (2)

[Claims] Claims: 1. A barrier label for inserts is previously attached to a cavity surface forming a side wall and a bottom of a female mold of an injection molding die, and a container body is injection-molded at the same time, and at the same time, a side wall and a bottom of the container body. In a square plastic cup container having a rounded horizontal cross-section for heat-sealing the barrier label for insert on the outer surface of the container, the developed shape of the barrier label for insert has a corner with a through hole for a gate in the central position. One side wall fusion part is continuously connected to one side of the round square bottom fusion part, and three other side wall fusion parts are sequentially connected in an arc shape to one side of the side wall fusion part. Characteristic barrier plastic cup container. 2. In advance, a barrier label for insert is inserted into the cavity surface forming the side wall and the bottom of the female mold of the injection molding die, and the container body is injection-molded, and at the same time, the side wall and the bottom of the container body. In a square plastic cup container having a rounded horizontal cross-section for heat-sealing the barrier label for insert on the outer surface of the container, the developed shape of the barrier label for insert has a corner with a through hole for a gate in the central position. One side wall fusion part is continuously provided on one side of the round square bottom fusion part, and one side wall fusion part and the other half side wall fusion part are respectively provided on both sides of the side wall fusion part. A barrier plastic cup container characterized in that the parts are connected in an arc shape.