JP5120807B2 - Cup-shaped container - Google Patents

Description

  The present invention relates to a cup-shaped container that is molded by a biaxial stretch blow molding means from a synthetic resin preform that is injection-molded in a deep dish shape.

As a conventional technique for molding synthetic resin cup-shaped containers, a deep dish-shaped synthetic resin preform is injection-molded, and the preform is fixedly fixed with an opening made of a mouth tube portion and a mouth flange. Thus, it is known to perform biaxial stretch blow molding on a cup-shaped container.
JP 2005-280329 A

  In the above prior art, as shown in FIGS. 6 and 7, the container 11 includes a mouth tube portion 12 and a flange portion 14 which are fixed to a biaxially stretched blow mold and become an unstretched portion. The cylinder portion 16 is formed of an opening portion and a bottom cylindrical portion 16 which is closed at the lower end with a bottom portion 18 and is formed into a linear taper cylinder shape. The stack portion 17 is provided at the lower end portion of the trunk tube portion 16.

  Since the body tube portion 16 is stretch blow molded as a fixed portion that does not stretch and deform the mouth tube portion 12, the structure of the connecting portion with respect to the mouth tube portion 12 is biased to the outside of the mouth tube portion 12, as shown in FIG. For this reason, the inner peripheral surface portion of the mouth tube portion 12 protrudes from the inner peripheral surface of the upper end portion of the body tube portion 16 to form an overhang portion 13, and the overhang portion 13 is formed in the mouth tube portion 12. Since this is an unstretched portion, it is a portion that must be formed.

  In the above-described prior art, the inner peripheral surface portion of the mouth tube portion 12 forms an overhanging portion 13 projecting inward with respect to the upper end portion of the trunk tube portion 16, so when the container 11 is stacked, Before the bottom portion 18 of the upper container 11 is placed on the stack portion 17 of the lower container 11, the upper end portion of the barrel portion 16 of the upper container 11 is placed on the overhanging portion 13 of the lower container 11. The phenomenon of bumping into the shape occurred.

  For this reason, the prior art has a problem that when containers are stacked, the stack height increases, and the efficiency of compact storage of a large number of containers decreases.

  In addition, since the collision of the barrel portion with the overhanging portion is fitted, there is a problem that the assembling becomes strong and it takes time to separate the stacked containers.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and it is a technical problem to eliminate the collision with the overhanging portion of the barrel portion when the containers are stacked. It is an object of the present invention to obtain a proper stacking operation and maintain a good separable state without reducing the compact storage efficiency of a large number of containers.

  The cup-shaped container of the present invention is biaxially stretched and blow-molded from a deep dish-shaped preform made of synthetic resin, with the mouth tube portion having a flange portion as a fixed portion, and is unstretched as a fixed portion. The integral part of the mouth tube part and the flange part, which is a part, the bottom part of the bottom part and the stack part at the bottom part, the tapered cylindrical body part, the mouth part and the body part A taper-shaped neck tube portion having a taper angle with respect to the central axis located between them is larger than the taper angle of the body tube portion.

The taper angle of the neck tube portion is set to a value that forms a gap between the overhanging portion formed on the inner peripheral surface of the mouth tube portion of the lower container and the upper container when the containers are stacked. .
Further, the height of the neck tube portion is set to a value at which the lower end of the neck tube portion of the upper container faces the protruding portion of the lower container when the containers are stacked.

  In other words, when the containers are stacked, the neck tube portion forms a “gap” as an “escape” between the protruding portion of the lower container and the upper container so that both the upper and lower sides at the time of stacking This prevents the occurrence of “bumps” between containers.

  When a container is stacked, a gap is formed between the upper container and the overhanging portion of the lower container, so that the bottom of the upper container is securely placed on the stack of the lower container. Thus, the stack state as set can be obtained.

  In addition, since the neck tube part has the same taper tube shape only with a different taper angle compared to the body tube part, no special device is required for the forming method, and the same biaxial stretching as before Proper molding can be performed by blow molding operation.

Also, the height of the neck tube part, when the stacked container relative to overhang the lower container, since the lower end of the neck tube of the container of the upper is set to a value opposite, tapered neck tube portion Under the condition of making the corner as small as possible, the height of the neck tube can be minimized.

Another configuration of the present invention is that the mouth tube portion and the flange portion are thermally crystallized at the time of preforming.

  In the case where the mouth tube portion and the flange portion are thermally crystallized at the time of the preform, the mouth tube portion and the flange portion are non-deformable parts. Handling such as heat treatment, preform assembly processing for blow mold, and the like becomes easy.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the present invention, the bottom part of the upper container is securely placed on the stack part of the lower container, so that the set stack state can be obtained, thereby causing a strong fit. Therefore, it is possible to reliably obtain the stack efficiency as designed.

  Further, since the neck tube portion can be appropriately formed by the same biaxial stretch blow molding operation as before, stable and safe productivity can be maintained.

The height of the neck tube part, when the stacked container relative to overhang the lower container, since the lower end of the neck tube of the container of the upper is set to a value opposite the taper angle of the neck tube portion Since the height of the neck tube can be kept to the minimum necessary under the condition of making it as small as possible, the change in the appearance of the container due to the provision of the neck tube should be hardly noticeable. it can.

  If the mouth tube and flange are thermally crystallized at the time of preforming, handling of the preform heat treatment for biaxial stretch blow molding processing, preform assembly processing for blow molds, etc. Since it becomes easy, the productivity of the container can be increased.

  Embodiments of the present invention will be described below with reference to FIGS.

  A cup-shaped container 1 according to the present invention includes a combination portion of a mouth tube portion 2 and a flange portion 4 constituting an opening portion of the container 1, a cylindrical barrel portion 6 having a diameter slightly increased upward, and this barrel. The bottom part 8 which seals the lower end of the part 6 and the short cylindrical neck cylinder part 5 which is provided between the mouth cylinder part 2 and the trunk cylinder part 6 and whose diameter is increased upward are configured.

  The mouth tube portion 2 is formed in a thick short cylindrical shape, and an outer flange-like thick flange portion 4 is connected to the upper end of the mouth tube portion 2, and a combined portion of the mouth tube portion 2 and the flange portion 4 ( 3) is an unstretched portion.

  The barrel portion 6 has a lower end that bulges inwardly in a dome shape and is sealed by a bottom portion 8 having a peripheral end portion as a leg portion, and is stacked in a configuration that protrudes inwardly at the lower end portion. The part 7 is provided around (see FIGS. 1 and 2).

  The neck tube portion 5 has a tapered cylindrical shape like the trunk tube portion 6, but the taper angle with respect to the central axis of the container 1 is set to a value larger than that of the trunk tube portion 6.

  The container 1 is biaxially stretch blow molded from a synthetic resin preform P such as PET, which is injection molded in a deep dish shape (see FIG. 2). Since the combined portion of the mouth tube portion 2 and the flange portion 4 that has been made non-deformable by crystallization treatment or the like is performed as an assembly fixing portion to the mold, the neck tube portion 5, the barrel tube portion 6, and the bottom portion 8. Will be blow-stretched.

  For this reason, the neck tube portion 5 has a structure (see FIG. 3) that is connected to a position biased to the outside of the mouth tube portion 2, and an overhanging portion 3 that protrudes inward is formed on the inner peripheral surface portion of the mouth tube portion 2. Will be formed.

  When the containers 1 are stacked (see FIGS. 4 and 5), the taper angle of the neck tube portion 5 is such that the lower end portion of the neck tube portion 5 of the upper container 1 and the protruding portion 3 of the lower container 1 are The value is set such that the gap b can be formed between them.

  In the case of the illustrated embodiment, with respect to the stack height a in the stacked state where the bottom portion 8 of the upper container 1 is placed on the stack portion 7 of the lower container 1, from the overhang portion 3 to the lower end of the neck tube portion 5. The height is set to be the same as the stack height a, and the height of the neck tube portion 5 is kept to the minimum necessary with the taper angle of the neck tube portion 5 as small as possible. I am doing so.

  Thus, in the stacked state of the plurality of containers 1, the bottom portion 8 of the upper container 1 is placed on the stack portion 7 of the lower container 1, and the overhanging portion 3 of the lower container 1 and the upper container 1 are A gap b is formed between the lower container 1 and the upper container 1 is not fitted and fixed, so that a large number of containers 1 can be stored in the stack, and containers from the stacked state can be obtained. 1 smooth separation operation can be obtained.

It is a whole front view of the example of an embodiment of the present invention. FIG. 2 is a half-vertical explanatory view of the embodiment shown in FIG. 1. It is the principal part expansion longitudinal cross-sectional view which expanded the principal part of FIG. FIG. 2 is a half vertical cross-sectional view of the embodiment shown in FIG. 1 in a stacked state. It is the principal part expansion longitudinal cross-sectional view which expanded the principal part of FIG. It is a semi-longitudinal sectional view of a stack state showing a conventional example. FIG. 7 is an enlarged vertical cross-sectional view of a main part, in which a main part of FIG. 6 is enlarged.

Explanation of symbols

1; Container 2; Mouth tube portion 3; Overhang portion 4; Flange portion 5; Neck tube portion 6; Trunk tube portion 7; Stack portion 8; Bottom P; Preform a; Stack height b; Mouth tube portion 13; Overhang portion 14; Flange portion 16; Body tube portion 17; Stack portion 18;

Claims (2)

A cup-shaped container that is biaxially stretched and blow-molded from a deep-plate-shaped synthetic resin preform with the outer tube-shaped flange part as a fixed part, with the lower end closed at the bottom and stacked at the lower end Forming a tapered cylindrical barrel portion, and between the barrel cylindrical portion and the mouth cylindrical portion, a tapered cylindrical neck barrel having a taper angle with respect to the central axis larger than that of the cylindrical barrel portion. And the taper angle of the neck tube is set to a value that forms a gap between the overhanging portion formed on the inner periphery of the mouth tube of the lower container and the upper container when the containers are stacked. In addition, the cup-shaped container is characterized in that the height width from the bottom portion to the stack portion is set equal to the height width from the protruding portion to the lower end of the neck tube portion . Mouth tube portion and the flange portion, the cup-shaped container according to claim 1, wherein obtained by thermal crystallization during preform.

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