JP2542492B2 - Manufacturing method of plastic bottle with handle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plastic bottle having a handle attached to the bottle separately from the bottle.

[0002]

2. Description of the Related Art Since a large plastic bottle is inconvenient to handle, a bottle integrally formed with a handle is used as a detergent.

However, in a bottle made of polyester resin such as polyethylene terephthalate, it is difficult to mold the handle integrally with the bottle body, so that the recess 2 is formed above the bottle body 1 as shown in the front view of FIG. However, a bottle in which a separate handle 3 is fitted in the recess 2 is proposed.

[0004]

However, the conventional one has the following drawbacks because the bottle and the handle are fitted at the end of the concave portion 2 on the outer surface side of the bottle.

That is, since the bottle recess 2 has a larger draw ratio during blow molding as it goes to the outer surface of the bottle, if the recess 2 does not have a projection or a recess for fitting a handle, the material is less likely to be deformed. It could not be molded into a sufficient shape, and its wall thickness was extremely thin, resulting in insufficient mounting strength.

[0006]

According to the present invention, a grip is formed by forming a laterally projecting fitting portion on the handle and engaging the tip of the grip fitting portion with the bottle at the deepest portion of the recess. It is a solution to the above problems while maintaining ease.

The present invention will be described in detail below.

FIG. 1 is a partially cutaway sectional view for explaining a method of manufacturing a plastic bottle with a handle according to the present invention, FIG. 2 is a perspective view showing an example of a handle, and FIG. 3 is a perspective view showing another example of a handle.
FIG. 4 is a perspective view showing another example of the plastic bottle with a handle obtained by the present invention, and FIG. 5 is a front view showing an example of a conventional plastic bottle with a handle.

According to the present invention, the grip portion 31 is provided in the molding die of the bottle for forming the handle mounting recess 2 on the upper side surface of the bottle 1.
And the grip 3 which comprises a fitting portion 32 projecting laterally from the grip portion, is set in advance so that the tip of the fitting portion 32 of the grip 3 is located at the deepest portion of the grip mounting recess 2. Every time, blow molding the bottle in the molding die,
In the method of manufacturing a plastic bottle with a handle, the tip of the fitting portion 32 of the handle is engaged with the bottle wall surface 11 to attach the handle to the bottle.

By the fitting portion 32 protruding in the lateral direction, the tip of the fitting portion 32 can be positioned at the innermost portion of the handle mounting recess 2, and by blow molding in this state, the innermost portion is made to be meat. Since the thickness is large and the molding is easy, the fitting portion 32
The tip of can be securely engaged.

In the example shown in FIG. 2, the handle 3 according to the present invention comprises a grip portion 31 and fitting portions 32 projecting laterally from both ends of the grip portion 31, and has a generally U-shape. ing. A protrusion 42 that rises upward and downward is provided at the tip of the fitting portion 32.

In this embodiment, two left and right protrusions 42 are provided so that when the bottle is fitted, it is easy to bite and the rattling of the handle is prevented.

The tip of the fitting portion 32 is set so as to be positioned at the innermost portion of the handle mounting recess 2 and blow molding is performed, so that the bottle wall surface 11 at the innermost portion of the bottle recessed portion has the protrusion 42. The bottle 1 and the handle 3 are engaged so as to be wrapped.

Since the innermost wall surface 11 of the bottle has a large wall thickness and is easy to mold, the protrusion 42 can be surely wrapped.

FIG. 3 is a perspective view showing another example of the handle 3, in which a recessed portion (recess or through hole) 52 is formed at the tip of the fitting portion 32.

The bottle wall surface 11 at the innermost portion of the bottle concave portion is set in the concave portion 52 by setting the tip of the fitting portion 32 so as to be positioned at the deepest portion of the handle mounting concave portion 2 and performing blow molding. And the bottle 1 and the handle 3 are engaged with each other.

In this case as well, since the wall surface of the innermost bottle has a large wall thickness and is easy to mold, it can be reliably projected into the recess 52.

When the handle 3 is composed of the grip 31 of the handle and the fitting portions 32 projecting laterally from the upper and lower ends thereof, and has a substantially U-shape as a whole, the upper and lower fitting portions 32 of the handle are provided. Since the upper and lower surfaces of the recess are supported, the deformation of the recess is small.

This grip 3 is not limited to the examples shown in FIGS. 2 and 3, but in short, the fitting portion 3 that projects laterally from the grip portion 31.
It is only necessary that the tip of the fitting portion 32 can be positioned at the deepest portion of the handle mounting recess 2 by means of 2, and it is most simple to manufacture the plastic material by injection molding.

The outer surface of the grip portion 31 of the handle 3 is substantially flush with the outer surface of the bottle 1 so that no storage or transportation space is required.

Therefore, the recess 2 has a size such that when the handle 3 is attached, the fingers can be sufficiently inserted into the space formed between the handle 3 and the recess 2.

In an ordinary bottle, the depth of the recess 2 is preferably about 1/4 to 1/3 of the diameter of the upper portion of the bottle 1.

FIG. 4 is a perspective view showing a further preferred embodiment, in which the vertical surface 21 of the recess 2 is provided with irregularities extending in the vertical direction.

Since the vertical surface 21 is located at the deepest part of the recess 2 and has a low draw ratio, it is thick but has low bending, buckling strength, heat resistance and the like. When it is formed, the stretching ratio is substantially increased and the strength of the material itself is increased, and the rib effect based on the shape also improves the strength, which is preferable.

The present invention is particularly suitable as a method for producing a large bottle of polyester resin having a volume of 1 liter or more.

[0026]

According to the bottle of the present invention, a handle having a grip portion and a fitting portion laterally protruding from the grip portion is provided in a molding die of the bottle having a handle mounting recess on the upper side surface of the bottle. Set in advance so that the tip of the fitting part of the handle is located at the deepest part of the handle mounting recess, blow mold the bottle in the molding die, and fit the handle by the bottle wall surface. Since the method of manufacturing a plastic bottle with a handle is characterized in that the handle is attached to the bottle by engaging the tips of the parts, a fitting portion protruding in the lateral direction causes the tip of the fitting portion to have a recess for attaching the handle. It is possible to position the tip of the fitting part because it can be positioned in the innermost part of the fitting, and by blow molding in this state, the innermost part has a large drawing thickness due to a low draw ratio, and it is easy to mold it into a predetermined shape. Engages more securely on the bottle wall Bets can be, handle is a sufficient strength is secured without play.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view illustrating a method for manufacturing a plastic bottle with a handle according to the present invention.

FIG. 2 is a perspective view showing an example of a handle.

FIG. 3 is a perspective view showing another example of the handle.

FIG. 4 is a perspective view showing another example of a plastic bottle with a handle obtained by the present invention.

FIG. 5 is a front view showing an example of a conventional plastic bottle with a handle.

[Explanation of symbols]

 1 Bottle 2 Recess for Mounting Handle 3 Handle 31 Handgrip 32 Fitting Part

Claims (1)

(57) [Claims] 1. A handle comprising a grip portion and a fitting portion laterally projecting from the grip portion is provided in advance in a mold of a bottle forming a grip mounting recess on the upper side surface of the bottle. It is set so that the tip of the fitting part is located at the deepest part of the handle mounting recess, the bottle is blow molded in the molding die, and the tip of the fitting part of the handle is engaged by the wall surface of the bottle. In addition, a method of manufacturing a plastic bottle with a handle, characterized in that the handle is attached to the bottle.