JP2000079925A - Heat-resistant and anti-pressure blow-molded bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an outer appearance of a bottle from being damaged by its deformation due to an increased inner pressure by a method wherein a plurality of deformation absorbing recess having a flat deformation absorbing plate gradually recessed from a lower part to an upper part are equally spaced apart in a radial direction around a lower end of a neck section at a shoulder section which is continuous to a lower end of the neck section. SOLUTION: A heat-resistant and anti-pressure blow molded bottle 10 is comprised of a neck section 100, a shoulder section 200, a barrel section and a bottom section made by a biaxial-orientation blow molding process with thermoplastic resin. A plurality of deformation recesses 210 having a flat deformation absorbing plate 211 gradually recessed from below to upward and having a rectangular horizontal section, for example, are equally spaced apart in a circumferential direction around a lower end of the neck section 100 at the shoulder section 200 which is continuous to the lower end of the neck section 100. In this way, the deformation absorbing plate 211 at the deformation absorbing recesses 210 arranged in the radial direction around the lower end of the neck section 100 is deformed by an inner pressure within the bottle to absorb an increase in inner pressure, resulting in that the bottle is not deformed to such a degree as one in which its outer appearance is not damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant and pressure-resistant blow-molded bottle used when the internal pressure is increased due to contents.

[0002]

2. Description of the Related Art Conventionally, plastic bottles made by stretch blow molding or direct blow molding have been applied to various contents over a wide range of use. (For example, at 65 ° C for 10 minutes) or when the internal pressure increases due to the storage environment of the bottle after filling the contents with the direct blow molded bottle, the upper part of the shoulder below the mouth and neck (stretch blow molding) In the bottle, the unstretched thick portion under the mouth and neck is intensively deformed by the increase of the internal pressure, and the appearance of the bottle may be significantly impaired.

In order to prevent deformation under the mouth and neck due to the increase in internal pressure as described above, in the case of a stretch blow molded bottle made of polyethylene terephthalate, the lower portion of the mouth and neck is heat-set (heat-fixed) for crystallization or heat resistance. Multi-layered with a conductive resin,
In the case of a direct blow-molded bottle, the thickness is increased or the mouth and neck are lengthened.

[0004]

However, in the above-mentioned conventional deformation preventing method, in the case of stretch blow molding, the cooling time is prolonged due to heat setting, thereby lowering productivity or complicating mechanical equipment. However, an expensive heat-resistant resin is required due to the multi-layering, and in the case of direct blow molding, an unnecessary resin amount is required.

The present invention solves the above-mentioned conventional problems, and does not impair the appearance due to deformation due to an increase in internal pressure, has good productivity, is inexpensive to manufacture, and is heat-resistant and pressure-resistant blow-molded. Offer bottles.

[0006]

Means for Solving the Problems A first invention of the present invention is:
A plastic blow-molded bottle, as shown in FIG. 1, having a shoulder (20) continuous with the lower end of the mouth and neck (100).
0), a deformation absorbing concave portion (210) having a flat deformation absorbing plate (211) gradually depressed from below upward.
A heat-resistant and pressure-resistant blow-molded bottle (10) characterized in that a plurality of the bottles are radially provided around the lower end of the mouth and neck at equal intervals.

Next, a second aspect of the present invention is characterized in that the horizontal cross-sectional shape of the deformation absorbing recess (210) is a quadrangle shown in FIG. 1 or a triangular shape shown in FIG.
Heat- and pressure-resistant blow-molded bottle (1)
0).

[0008]

The heat-resistant and pressure-resistant blow-molded bottle of the present invention comprises:
Even if the internal pressure inside the bottle rises due to heat sterilization or storage environment,
As shown in FIG. 2, a deformation absorbing recess (210) is provided on the shoulder (200) which is continuous with the lower end of the mouth and neck, as shown in FIG.
A plurality of radially provided circumferences are provided at regular intervals around the lower end, and a rib-shaped portion (220) having strength is naturally formed between the deformation absorbing recesses. The absorbing plate (211) is deformed by the internal pressure to absorb the internal pressure, and does not deform the upper part of the shoulder below the mouth and neck so as to impair the appearance.

Further, the heat-resistant and pressure-resistant blow-molded bottle of the present invention merely forms a deformation-absorbing concave portion in the shoulder portion. It is not necessary to increase the thickness, thickness, and length of the mouth and neck, so that the productivity is good and the manufacturing cost is low.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The heat-resistant and pressure-resistant blow-molded bottle of the present invention comprises a neck, a shoulder, a body, and a bottom made of a thermoplastic resin by a biaxial stretch blow molding method or a direct blow molding method. Plastic blow molded bottle. Usually, as the resin of the biaxial stretch blow molded bottle,
Polyethylene terephthalate is used, and polyethylene, polypropylene, polyethylene terephthalate, and the like are used as the resin for the direct blow molded bottle. As shown in FIG. 1, a male screw (101) with a cap, a support ring (102) for filling, and the like are usually provided on the outer peripheral surface of the mouth and neck (100).

As shown in FIG. 1, the mouth and neck (10
A deformable absorbing recess (210) having a flat deforming absorbing plate (211) gradually depressed upward from below is provided on a shoulder (200) connected to the lower end of (0). A plurality of radially arranged at equal intervals.

The shape of the above-mentioned deformation absorbing concave portion (210) is usually such that the horizontal cross-sectional shape is formed in a square as shown in FIG. 1 or a triangle as shown in FIG. 3, but is not limited to these shapes. . In addition, the size and depth are designed to have an arbitrary size and depth according to the purpose of use of the container.

[0013]

According to the heat- and pressure-resistant blow-molded bottle of the present invention, the deformation-absorbing plates of a plurality of deformation-absorbing recesses provided radially on the shoulder around the lower end of the mouth and neck are deformed by the internal pressure in the bottle. As a result, the bottle is not deformed enough to impair the appearance.

Further, the heat-resistant and pressure-resistant blow-molded bottle of the present invention is the same as ordinary molding because it only forms a deformation-absorbing recess in the shoulder, and has good productivity and low production cost. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a heat-resistant and pressure-resistant blow-molded bottle according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a deformation absorbing plate of a deformation absorbing concave portion of a shoulder absorbs an increase in the internal pressure of the bottle.

FIG. 3 is a perspective view showing another shape of the deformation absorbing concave portion.

[Explanation of symbols]

 Reference Signs List 10 bottle 100 mouth neck 101 male screw 102 ring 200 shoulder 210 deformation absorbing concave portion 211 deformation absorbing plate 220 rib shape portion

Continued on the front page F term (reference) 3E033 AA01 BA13 BA15 BA16 BA18 CA05 CA07 DA03 DB01 EA03 EA06 FA03 GA02

Claims (2)

[Claims] 1. A plastic blow-molded bottle, comprising a deformation absorbing recess having a flat deformation absorbing plate which is gradually depressed upward from below at a shoulder continuous with a lower end of a mouth and neck. A heat-resistant and pressure-resistant blow-molded bottle having a plurality of radially arranged around the lower end of the neck at equal intervals. 2. The heat- and pressure-resistant blow-molded bottle according to claim 1, wherein the horizontal cross-sectional shape of the deformation absorbing concave portion is quadrangular or triangular.