JPH05154897A - Production of bottle with handle and handle to be used - Google Patents

Abstract

PURPOSE:To enhance moldability of a body wall to be engaged with an engaging part of a handle and improve a mounting strength of the handle to the bottle body by a method wherein the handle is moved toward the bottle body during blow molding, and the engaging part of the handle is extruded into a bottle body mold. CONSTITUTION:During blow molding of a bottle body 1, a handle 2 is mounted on the bottle body 1 by engaging an engaging part 3 provided in the handle 2 with a body wall 1a. During the blow molding, the handle 2 is mowed toward the bottle body 1 so that the engaging part 3 of the handle 2 is extruded into a mold 10. The handle 2 is moved toward the bottle body 1 just before the completion of the orientation deformation of the bottle body 1. Furthermore, a sharply-tapered part 5 having a cross section of a substantially triangluer shape is provided on the top surface of the engaging part 3 integrally provided with a handle frame body 2a. The two or more sharply-tapered parts 5 are provided at fixed intervals in the longitudinal direction of the engaging part 3. In this manner, the body wall part opposed to the engaging part of the handle is molded by being locally subjected to a molding force larger than that of the other parts. Thus, an expansion part to be engaged with the engaging part is positively molded.

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 synthetic resin bottle with a handle and a structure of the handle used in this method.

[0002]

2. Description of the Related Art As a method for producing a bottle with a handle made of a synthetic resin such as polyethylene terephthalate resin, a method described in JP-A-58-99350 has been proposed. In this method, the handle part is separately molded, and the engagement part consisting of a protrusion, a recess or a hole is formed around the joint with the bottle body, and when the bottle body is blow molded, The handle is fixed to the bottle body by engaging the part of the expanded main body wall with the engaging part of the handle that has been fixed to the above by utilizing the expansion deformation of this main body wall, that is, the expansion deformation. Is the way to do it.

[0003]

However, in the above-mentioned prior art, when the engaging portion formed on the handle is a deep concave portion or the like, the main body which expands during blow molding and engages with this engaging portion. The moldability of part of the wall is poor, and it is easy for the engaging part of the handle and part of the wall of the main body to not fit well, so there is a problem that the strength of attaching the handle to the bottle body is not sufficient. there were.

Therefore, the present invention was devised to solve the above-mentioned problems in the prior art. When the bottle main body and the handle are engaged by blow molding, the main body wall is engaged with the engaging portion of the handle. The technical problem is to improve the moldability of the part, and it is therefore an object of the present invention to improve the strength with which the handle is attached to the bottle body.

[0005]

Means for Solving the Problems The means of the present invention for solving the above technical problem is to engage an engaging portion provided on a handle with a part of a main body wall at the time of blow molding of a bottle main body.
There is a method of attaching the handle to the bottle body, and when the bottle body is blow-molded, the handle is moved in the bottle body direction and the engaging portion of the handle is pushed out into the mold for molding the bottle body.

The timing of movement of the handle in the direction of the bottle body is preferably set immediately before the end of the stretching deformation of the bottle body.

The handle used in this method of manufacturing a bottle with a handle has a structure in which a tip portion having an approximately triangular cross section is provided on the tip end surface of an engaging portion integrally provided on the handle frame.

In this handle, it is preferable to form a plurality of sharpened portions at regular intervals in the longitudinal direction of the engaging portion.

[0009]

[Function] During blow molding of the bottle body, the handle is moved in the direction of the bottle body during blow molding, and the engaging portion of the handle is pushed out into the mold for molding the bottle body. The outward force, which is a blow molding force, and the inward force from the engaging portion, which is in the opposite direction to the blow molding force, act simultaneously on the main body wall portion. The main body wall portion facing the joining portion locally receives a much stronger forming force than the other main body wall portions and is formed into the final shape.

For this reason, the main body wall portion facing the engaging portion of the handle is molded with high moldability by using the engaging portion protruding into the mold as a part of the molding die surface, and is firmly engaged with the engaging portion. The mating bulge will be reliably molded.

If the timing for moving the handle in the bottle body direction is set to a point immediately before the end of the stretching deformation of the bottle body, the stretching deformation is stopped by coming into contact with the engaging portion of the handle pushed into the mold. The body wall portion is also in a sufficiently stretched and deformed state, and therefore, the handle attachment portion of the bottle body does not have a locally insufficient stretch portion.

Further, since the engaging portion of the handle extruded into the mold pushes back only the opposing main body wall portion of the main body wall that has been substantially stretch-blow deformed, this push-back operation forms the expanded portion. Since the stretching deformation of the main body wall portion is promoted, the bulging portion can be molded with good moldability.

Since the sharpened portion is provided on the tip surface of the engaging portion of the handle, at the initial stage of pushing the engaging portion of the handle into the mold, the engaging portion is attached to the main body wall only by the sharpened portion. It is possible to reduce the size of the main body wall portion where extension deformation stops due to contact with the engagement portion, thereby achieving the formation of the bulge portion without causing extreme local extension. You can

When a plurality of sharpened portions of the handle are divided and provided, a gap is formed between the adjacent sharpened portions, and a part of the main body wall is depressed into the gap and meshed with each other. As a result, the attachment of the handle to the bottle body becomes stronger, and a good attachment with no looseness of the handle to the bottle body can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a bottle body made of a thermoplastic synthetic resin, and a material suitable for biaxial stretch blow molding such as polyethylene terephthalate resin is particularly preferable.

Reference numeral 2 is a handle, and an engaging portion having a substantially T-shaped cross section is provided on the front surface of the flat plate-shaped portion of the holding frame body 2a, which has a substantially rectangular frame shape, on the side where it is assembled with the bottle body 1. 3 are vertically integrated, and a pair of left and right engaging recesses 4 are formed between the holding frame body 2a and the assembly-side flat plate-like portion. The front surface of the engaging portion 3 has a cross section. A plurality of isosceles triangle-shaped sharpened portions 5 are provided so as to project in the longitudinal direction at regular intervals. Note that the sharpened portion 5 may not be divided into a plurality of pieces as shown in FIG. 4, but may be integrally formed in a long block shape.

Next, a method of manufacturing a bottle with a handle using the handle 2 will be described with reference to FIGS. 1 and 2. A preform for molding the bottle body 1 which has been molded by injection molding in advance is heated to a predetermined temperature, and a mold 10 for molding the bottle is formed.
Set it in the specified position. On the other hand, the handle 2 is a mold 10
It is set in the handle space 11 provided at. In this case, the handle 2 is assembled so as to be capable of advancing and retracting inward of the mold 10 by an appropriate driving means, and the engaging portion 3 thereof is pushed out into the mold 10 when moving forward.

Therefore, as shown in FIG. 1, when the preform is biaxially stretch blow-molded and the main body wall 1a approaches the mold surface of the mold 10, that is, immediately before the end of the blow molding, the handle 2 is pulled. It is rapidly pushed out of the handle space 11 into the mold 10. By extruding the handle 2 into the mold 10, that is, by protruding the engaging portion 3 from the mold surface of the mold 10, the main body wall 1a portion facing the engaging portion 3 is locally located at the tip of the sharpened portion 5. While being in contact with each other, they are simultaneously subjected to an outward force and an inward force to be stretched and deformed.

In this case, the main body wall 1a facing the engaging portion 3
The stretch deformation mode of the portion is such that the local portion in contact with the sharpened portion 5 is pushed inward in a state in which the backward movement is prevented by the blow molding force, and the remaining portion is stretched and deformed by this pushing. Since the pushing force by 2 is a mechanical force that directly acts, the stretching deformation of the remaining portion is surely achieved.

Further, since a part of the main body wall 1a facing the engaging portion 3 is only in contact with the sharpened portion 5, the area of the stretchable portion can be increased. , So that good moldability can be maintained,
As shown in FIG. 2, it is possible to form the bulging portion 1b that has sufficiently penetrated into the engaging recessed portion 4.

Further, since a gap is formed between the sharpened portions 5, a part of the main body wall 1a enters into the gap to engage with each other, so that the handle 2 is not attached to the bottle main body 1 loosely. It becomes extremely strong without sticking.

[0021]

Since the present invention has the above-mentioned structure, it has the following effects. Since the part of the main body wall of the bottle body that engages with the grip engaging part is molded into the final shape by the combined force of the blow molding force and the pushing force of the grip, it must be molded with extremely good moldability. As a result, the strength with which the handle is attached to the bottle body can be made extremely strong.

By pushing the handle immediately before the blow molding of the bottle body, the main body wall portion whose extension deformation is stopped due to contact with the engaging portion of the handle is sufficiently before contacting with the engaging portion. It can be stretched and deformed, so that the bottle body can be satisfactorily stretch-blow-molded in a state in which there is no understretched portion.

Since the sharpened portion is provided on the front surface of the engaging portion of the handle, it is possible to increase the stretchable deformable area of the portion of the main body wall facing the engaging portion, thereby generating a thin portion due to local excessive stretching. Good moldability can be obtained without doing so.

When the sharpened part of the handle is divided into a plurality of parts,
Since a part of the main body wall invades between the divided sharp parts, the force that regulates the position where the handle is attached to the bottle body becomes stronger, so that the attachment of the handle to the bottle body is loose. Not good.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a cross-sectional plan view of essential parts in a state during molding.

FIG. 2 is a plan sectional view of an essential part showing a state after completion of blow molding.

FIG. 3 is a side view in which a part of the molded bottle body is shown in section.

FIG. 4 is an overall perspective view of the handle.

[Explanation of symbols]

 1; Bottle main body 1a; Main body wall 1b; Swelling portion 2; Grip 2a; Grip frame 3; Engagement portion 4; Engagement recess 5; Sharp tip 10; Mold 11; Handle space

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Claims (4)

[Claims] 1. A handle (2) for blow molding the bottle body (1).
A method of attaching the handle (2) to the bottle body (1) by engaging a part of the body wall (1a) with the engaging portion (3) provided in the blow molding, The grip (2) is moved toward the bottle body (1), and the engaging portion (3) of the grip (2) is moved.
A method for manufacturing a bottle body with a handle that pushes into a mold (10). 2. The movement of the handle (2) in the direction of the bottle body (1),
The method for manufacturing a bottle with a handle according to claim 1, which is performed immediately before the end of the stretching deformation of the bottle body (1). 3. An engaging portion (3) integrally formed with the handle frame (2a).
The handle for use in the method according to claim 1, wherein a sharpened portion (5) having a substantially triangular cross section is provided on the front end surface of the handle. 4. The handle according to claim 3, wherein a plurality of sharpened portions (5) are formed at regular intervals in the longitudinal direction of the engaging portion (3).