JPH0331691Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of a biaxial stretch blow-molded bottle made of synthetic resin such as polyethylene terephthalate resin.

[Conventional technology]

BACKGROUND OF THE INVENTION Synthetic resin bottles are widely used as relatively large bottle-shaped containers for storing liquids such as whiskey and soy sauce.

The most effective method for forming this bottle is considered to be a method in which a primary molded product made of a crystalline synthetic resin material is formed into a bottle by biaxial stretch blow molding, and in particular, molded from polyethylene terephthalate resin. The resulting biaxially stretched blow-molded bottle had many advantages, including being thin and lightweight, having excellent mechanical strength and resistance to contents, and being able to be mass-produced at low cost.

Taking into consideration the appearance, the body of the bottle was constructed into a rectangular cylinder shape, and the distance between the bottoms of a pair of recesses provided by inwardly recessing both sides of the center of the body was adjusted. It has become popular to make it smaller and to make it easier to hold by forming a handle in the rear half of the body using both recesses.

[Problem that the invention attempts to solve]

However, as mentioned above, in a configuration where the handle remains in the rear half of the body of the bottle, when the handle is gripped, gripping force is applied from both sides of the handle, so the wall is thin. Because of this, the grip part was easily deformed, making it difficult to hold. Therefore, in order to provide the handle with mechanical strength sufficient to withstand pressure from both sides, it is conceivable to provide a reinforcing rib groove in a part of the handle.

By the way, the bottle having the above-described structure is biaxially stretch blow-molded by placing the primary molded product in a molding space formed by a pair of molds, and therefore, the above-described recess is formed in the body. When installed in the center of
The mold closing or mold release direction of the mold is a direction perpendicular to the side surface of the rectangular cylindrical bottle to be molded, and therefore the parting line formed on the molded bottle is the same as the front and back sides of the bottle. It will be formed from the top to the bottom.

However, for this type of bottle, the display of the contents must be placed somewhere on the surface of the bottle, and in most cases it is particularly visible on the front of the bottle. This display means is done by pasting a label with a predetermined print on it or by printing it directly on the surface.As mentioned above, a parting line is formed on the front of the bottle, so the label There were drawbacks such as wrinkles forming during application and printing not being achieved reliably.

In addition, with this configuration, it is impossible to provide the reinforcing rib groove on the rear surface of the handle, considering the mold release direction, and therefore, the mechanical strength of the handle remains uncertain.

Therefore, first of all, regarding the issue of label attachment, etc., it is possible to form the parting line along the ridgeline of the rectangular cylindrical bottle. Since the recess is provided and the handle remains in the rear half, the upper and lower parts of the rear half of the body protrude outward beyond the handle. It was discovered that the mold got stuck and could not be released from the mold.

This difficulty in releasing the mold will further increase if a reinforcing rib groove is provided in a portion of the handle as described above.

The present invention is a biaxially stretched blow-molded bottle devised to eliminate the above-mentioned conventional drawbacks and inconveniences, in which a parting line is formed along the ridgeline of a square cylinder-shaped bottle, and the mold is released. It is an object of the present invention to reliably achieve this and further ensure the mechanical strength of the handle portion to be formed.

[Means for solving problems]

Hereinafter, the present invention will be explained with reference to the drawings showing one embodiment of the present invention.

The biaxial stretch blow-molded bottle 1 according to the present invention has a pair of recesses 4 on both sides of the central part of a rectangular cylindrical body 2 by inwardly recessing the cylindrical wall. It has a configuration in which a handle portion 7 is formed on the side.

At least one side end portion of the handle portion 7 is formed into an inclined surface 8 having a maximum angle perpendicular to an imaginary diagonal line of the planar shape of the body portion 2 described above.

Furthermore, a plurality of reinforcing rib grooves 9 are recessed into the rear wall of the handle portion 7 in the form of horizontal grooves to ensure the mechanical strength of the handle portion 7. The other side end wall has an inclined surface 8 whose maximum angle is perpendicular to the diagonal line.

[Effect]

In the above structure, since the reinforcing rib groove 9 is provided horizontally on the rear wall of the handle part 7, the handle part 7 is not deformed unnecessarily due to the grip force exerted by a person's hand, and this grip force This will fully demonstrate the opposing force against the enemy.

A handle portion 7 formed in the rear half of the body portion 2
At least one side end portion of is formed into an inclined surface 8 whose maximum angle is perpendicular to the imaginary diagonal line of the planar shape of the body 2, so that it can be used as a mold matching surface of a blow mold for molding the bottle. By configuring the handle 7 to be located on the diagonal line mentioned above, and by making the mold clamping or mold release direction of the mold 12 perpendicular to the diagonal line in the planar shape of the body 2, the handle part 7
will not get caught.

Further, the reinforcing rib groove 9 on the rear wall of the handle portion 7 has a maximum inclination angle of the other side end wall opposite to one side end portion of the handle portion 7 at right angles to the above diagonal line. Since the surface has an inclined angle, the reinforcing rib groove 9 will not get caught during mold release.

Since the operating direction of the mold 12 is the above-mentioned direction, the parting line is formed along the ridgeline of the rectangular cylindrical body 2.

〔Example〕

The drawings illustrate one embodiment of the invention,
A mouth portion 3 is connected to the upper end of a rectangular cylinder-shaped body portion 2, and recesses 4 provided on both sides of the body portion 2 are as follows.
It is formed by a soot tapered wall 6 that gently recesses toward the bottom 5, which is the center thereof, so that there is no risk of hindrance to demolding.

The upper part 10 and the lower part 11 in the rear half of the body part 2 protrude outward from the handle part 7, but the side end parts of the handle part 7 are at the maximum perpendicular to the diagonal as described above. Since the inclined surface 8 has an angle of inclination of 0.05, smooth release from the mold can be achieved.

Further, for the same reason, the reinforcing rib groove 9 horizontally provided on the rear wall of the handle portion 7 will not get caught during demolding.

A plurality of reinforcing rib grooves 9 are provided in parallel at regular intervals on the rear surface of the handle 7 to ensure the mechanical strength of the handle 7.

[Effect of idea]

As is clear from the above description, the biaxially stretched blow-molded bottle of the present invention has reinforcing rib grooves installed horizontally in the handle formed at the rear, which increases mechanical strength and provides sufficient grip strength. It has a counter force of As a result, it is possible to reliably and easily attach a label to the front surface of the body or print directly on the surface, and also to attach a label to the front surface of the body, or to print the label directly on the surface of the body. Since the inclination angle of one side end portion or the inclination angle of the other side end wall of the reinforcing rib groove is an inclined surface with a maximum inclination angle perpendicular to the diagonal line,
It has many advantages such as the handle part or the reinforcing rib groove of the handle part does not get caught during mold release, the mold release can be reliably achieved without damaging the molded product, and the structure is simple and molding is easy. It has a good effect.

[Brief explanation of drawings]

FIG. 1 is a side view of a biaxially stretched blow-molded bottle according to the present invention. FIG. 2 is a plan cross-sectional view of the embodiment shown in FIG. 1, taken across the center of the body. Explanation of symbols: 1; Bottle; 2; Body; 4; Recess;
5: Bottom, 7: Handle, 8: Inclined surface, 9: Reinforcement rib groove, 12: Mold.

Claims (1)

[Scope of utility model registration request] A pair of recesses are formed by inwardly recessing both sides of the center of the rectangular cylindrical body to form a handle in the latter half of the center of the body, and at least one side of the handle The side end portion is formed into an inclined surface with a maximum angle perpendicular to an imaginary diagonal line of the planar shape of the body, and a plurality of reinforcing rib grooves in the shape of horizontal grooves are recessed in the rear wall of the handle portion. The biaxially stretched blow-molded bottle further comprises an inclined surface of the end wall on the other side of the reinforcing rib groove whose maximum inclination angle is perpendicular to the diagonal line.