JPH0344665Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bottom structure of a bottle biaxially stretch blow-molded with an acrylonitrile resin.

[Conventional technology]

BACKGROUND ART In recent years, synthetic resin bottles have been widely used as bottles for storing juices, soy sauce, etc.

The problems required for this type of bottle are that it should be able to prevent deformation due to the pressure of the liquid contained in it;
Since the stored liquid is heat-treated before filling, it has excellent heat resistance.

The resin most widely used as a molding material for biaxially stretched blow-molded bottles is polyethylene terephthalate resin, which has been found to be nearly satisfactory under various conditions; however, regarding the issue of heat resistance, There are still some issues that have not been resolved, and the phenomenon of bleaching may occur.

Therefore, it is conceivable to biaxially stretch blow mold the bottle using acrylonitrile resin, which has relatively excellent heat resistance, instead of polyethylene terephthalate resin.

[The problem that the idea attempts to solve]

However, this biaxial stretch blow-molded bottle made of acrylonitrile resin has inferior impact resistance compared to a bottle made of polyethylene terephthalate resin.
It has the disadvantage of being brittle, and as a result, when handling the bottle, there is a problem that there is concern about the mechanical strength of the bottom part, where the mechanical impact force is most applied from the outside.

In addition, in order to fully stretch and deform the bottom of the biaxial stretch blow-molded bottle to the same extent as other parts of the bottle, the bottom was first bulged into a hemispherical shell shape and then stretched. There is a method of making the bottom part have a self-supporting function by recessing the center part of the bottom part inward.
The bottom formed in this way has a thin wall as the entire bottom is fully stretch-molded, so the bottom also has a
Similar to the body, stretch molding can provide effects such as transparency and resistance to contents, but the impact resistance is never sufficient, especially when the bottle is molded from acrylonitrile resin. Low impact resistance is a fatal flaw as a container.

Therefore, the present invention was devised to solve the above-mentioned problems in the conventional technology, and the technical problem is to provide a biaxial stretch blow-molded bottle made of acrylonitrile resin with a high impact resistance at the bottom. ,
The object of the present invention is to obtain a biaxially stretched blow-molded bottle made of synthetic resin that has high heat resistance.

[Means to solve the problem]

The means of the present invention to solve the above technical problem is to use biaxially stretched acrylonitrile resin, which has an inwardly recessed part in the center of the bottom wall connected to the lower end of the cylindrical body. The blow-molded bottle body is provided with a depression in the center of the bottom plate of the bottomed short cylinder body, which contacts the bottom of the recess in the bottom wall of the bottle body, and a recessed part that comes into contact with the bottom of the concave part of the bottom wall of the bottle body, and the bottom plate of the same bottomed short cylinder body is formed at equal central angles. The base cup has a plurality of protruding legs, and has a base cup that is fitted and assembled to the bottom of the bottle body including the bottom wall, and when the base cup is assembled to the bottle body, A gap is formed between the outer surface of the bottom wall of the main body and the outer surface of the bottom wall of the main body.

[Effect]

The base cup, which is fitted and assembled from below to the bottom including the bottom wall of the bottle body, provides legs that support the bottle body and make it independent.
The actual legs of this base cup, that is, the legs that directly contact the floor and support the load of the bottle, which is a combination of the bottle body and the base cup, are located at the bottom of the base cup, which has a short cylindrical shape with a bottom. In other words, the legs protrude from the bottom plate of the base cup.

The legs of the base cup that form the legs of the bottle body are provided with a plurality of protruding legs at equal central angles on the bottom plate of the base cup. In other words, a gap is formed between the bottom surfaces, so when the bottle is placed upright on the floor, the bottom wall of the bottle will float above the floor by the gap, It is in a state where it is supported by the bottom plate portion of the base cup other than where the legs are provided and the recessed portion with which the recessed portion abuts from below.

Therefore, if a mechanical impact force is applied from the outside to the legs of the base cup for some reason, this impact force is absorbed by the elastic deformation of the legs, preventing the strong impact force from acting directly on the bottom wall of the bottle body. In this way, the base cup acts as a buffer for the bottom wall of the bottle body.

The buffering function of the base cup is achieved by the elastic deformation of the legs and the elastic deformation of the depressed portion in the direction of the depression due to the elastic deformation of the legs.When an impact force is applied to the base cup, the force acting on the bottle body is:
The only push-up force from the recess of the base cup is against the recess located in the center of the bottom wall, and the push-up force from the recess against this recess is due to the fact that this recess is recessed inward at the center of the bottom wall of the bottle body. Therefore, it is absorbed easily by the elastic deformation of the concave portion in the direction of depression.

Note that the base cup exhibits its effective buffering function when the amount of elastic deformation of the leg is within the range of the gap value, and is effective against impact forces that cause a deformation of the leg that is larger than the gap value. This means that the buffering effect cannot be exerted. Therefore, the gap value, ie, the degree of bulge of the legs, is set based on the maximum value of the impact force expected to act on the bottle during normal handling.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

The body 2 of the bottle body 1 has a cylindrical shape, and the bottom wall 3 connected to the lower end of the body 2 is formed into a recess by inwardly recessing the central part of the hemispherical shell-like body that bulges downward. 5, the lower part of the cylindrical wall part 4 extending downward from the body 2 is curved inwardly and inverted and connected to the recess 5 having a flat recess bottom wall part 6. A circumferential groove 7 is provided at the continuous boundary between the cylinder wall 4 and the cylinder wall 4.
There is a cave-in surrounding the area.

This bottle body 1 is produced by biaxial stretch blow molding from a bottomed cylindrical preform into an intermediate molded product whose bottom part bulges downward into a hemispherical shell shape, and by deforming the central part of the bottom of this intermediate molded product by concave deformation. It is preferable that the concave portion 5 is formed by a molding method in which the concave portion 5 is formed by using the same method.

The base cup 8 is a bottomed cylinder made of a suitable synthetic resin material or hard cardboard, etc., and has a bottom plate connected to the lower end of the peripheral wall part 9 and has an inner diameter equal to the outer diameter of the upper end part of the cylindrical wall part 4 of the bottom wall 3 of the bottle body 1. In the center of this bottom plate, there is a depressed part 10 which fits into the depressed part 5 by bringing the flat depressed part bottom wall part 11 into contact with the depressed part bottom wall part 6 of the depressed part 5, and is depressed in a curved and inverted form. Four wide legs 12 are provided at equal central angles on the bottom plate portion of the depressed portion 10 from the peripheral edge of the depressed portion bottom wall portion 11 to the lower end of the peripheral wall portion 9. Furthermore, on the upper edge of the inner peripheral surface of the peripheral wall portion 9,
A locking strip 13 that engages with the circumferential groove 7 of the bottle body 1 is provided around the periphery.

Therefore, assembly of the base cup 8 to the bottle body 1 is achieved by fitting the base cup 8 into the bottom wall 3 of the bottle body 1 from below until its locking strip 13 engages with the circumferential groove 7. .

In the state where the base cup 8 is assembled to the bottle body 1, the recessed part 10 of the base cup 8 has a flat upper surface of the recessed part bottom wall part 11, and the recessed part bottom wall part of the recessed part 5 of the bottom wall 3 of the bottle main body 1. 6, and by the engagement of this locking strip 13 with the circumferential groove 7 and the abutment of the depression bottom wall 11 with the depression bottom wall 6, the bottle body 1 is The assembled posture of the base cup 8 is maintained constant.

In addition, since the four legs 12 are formed to have a wide width, they can provide a relatively large standing surface, which allows the bottle to stand in a stable standing state, and prevents external shocks. When force is applied, smoother elastic deformation is possible, and a good cushioning effect is achieved.

In the case of the illustrated embodiment, the upper surface of the bottom plate portion other than that formed on the legs 12 of the base cup 8 is brought into contact with the lower surface of the bottom wall 3 of the bottle body 1; In addition to stabilizing the assembly posture more firmly, the elastic deformation form of the legs 12 forming the gap 14 between the lower surface of the bottom wall 3 of the bottle body 1 and the lower surface of the bottle body 1 is made constant, so that each leg 12 exerts its full potential. Base cup 8 with uniform buffering function
This is to make the buffering effect exerted by the material better and more stable.

[Effect of idea]

Since the present invention has the above-described configuration, it has the following effects.

a leg forming a substantial leg of the base cup;
A gap is formed between the bottom wall of the bottle body, so
The legs can be elastically deformed smoothly without impacting the bottle body, and the base cup can exert a sufficient and extremely good cushioning effect, making it possible to use acrylonitrile, which has a mechanical impact resistance that is never sufficiently large. The bottom wall of the bottle body, which is a biaxial stretch blow-molded bottle made of resin, can be sufficiently protected from external impact forces, and the heat resistance of acrylonitrile resin can be used to overcome the problem of low impact resistance. It can be effectively used as a bottle container without having to do anything.

A concave part is recessed in the center of the bottom wall of the bottle body, and
Since the recessed part of the base cup is fitted into and abutted on this recessed part, a part of the deformation force of the base cup due to the elastic deformation of the legs of the base cup is absorbed by the natural inward elastic deformation of the recessed part of the bottle body. This allows the base cup to have a stronger and smoother cushioning effect.

Since the base cup forms a standing leg portion with a plurality of legs, even if some molding distortion occurs in the base cup, it can exhibit a good standing leg function without being affected by this distortion.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention with main parts cut away. FIG. 2 is an overall perspective view of the base cup in the embodiment shown in FIG. 1.
FIG. 3 is a vertical sectional view of the main part of the embodiment shown in FIG. Explanation of symbols: 1; Bottle body; 2; Body; 3; Bottom wall; 4; Cylindrical wall; 5; Recess; 6; Recess bottom wall;
7; Peripheral groove, 8; Base cup, 9; Peripheral wall portion, 1
0; recessed part, 11; recessed part bottom wall part, 12; leg, 1
3; locking strip, 14; gap.

Claims (1)

[Scope of utility model registration request] A biaxial stretch blow-molded bottle body made of acrylnitrile resin, which has an inwardly recessed part in the center of the bottom wall connected to the lower end of the cylindrical body;
The bottomed short cylindrical body is provided with a recessed portion in the center of the bottom plate that comes into contact with the bottom surface of the recess, and a plurality of legs are protruded from the bottom plate at equal central angles, and the bottle includes the bottom wall. and a base cup that is fitted and assembled to the bottom of the bottle body, and a gap is formed between the inner surface of the leg and the outer surface of the bottom wall when the base cup is assembled to the bottle body. Bottom structure of the bottle.