JPH0699986A - Manufacture of plastic bottle with handle and the plastic bottle with handle - Google Patents

Abstract

PURPOSE:To obtain a plastic bottle with handle being comparatively easy to mold and also strong by molding a bottle body from a preform with handle in a blow molding die and concurrently by securing the lower end of the handle through holding the lower end between the bottle body and a handle-fixing sheet. CONSTITUTION:In the manufacture of a plastic bottle with handle by biaxial orientation blow molding, a preheated preform 10 with handle composed of a mouth-neck part 101, bottle body-preforming part 13 and handle 102 is inserted in the predetermined position in a blow molding die 500. Further, after a handle- fixing sheet 30 broader in width than the lower end of the handle is inserted in the predetermined position of the die 500 so that a heat-sensitive adhesive layer on the inside of the sheet faces the outside of the handle lower end 105, a bottle body is molded from the preform 10 and, concurrently, the handle lower end 105 is held between the bottle body 103 and handle-fixing sheet 30 so as to be secured. As a result, it is possible to obtain a plastic bottle with handle being comparatively easy to mold and also strong.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a plastic bottle with a handle from a preform by a biaxial stretch blow molding method.

[0002]

2. Description of the Related Art Conventionally, as a method of attaching a handle to a biaxially stretched blow plastic bottle (hereinafter referred to as a bottle), a method of attaching a separately produced handle to a molded bottle from the outside with a fitting, A method of molding a preform with an inverted L-shaped handle disclosed in Japanese Patent Publication No. 61-29246 (see FIG. 9) and molding a bottle from the preform, or disclosed in Japanese Utility Model Laid-Open No. 56-100337. The upper end of the handle is attached and fixed to the base end of the mouth and neck of the prepared preform (see FIG. 8), a bottle is molded from this preform, and the lower end of the handle is fitted and fixed to the bottle body. There was a way.

[0003]

However, in the method of attaching the handle to the bottle later, although the function of the handle is perfect, an additional attaching member and attaching work are required, resulting in high manufacturing cost. In addition, Japanese Examined Japanese Patent Publication 61-2924
In the method of No. 6, since the lower end of the handle is not fixed,
In the case of a large-capacity bottle, the handle could be bent or broken. Furthermore, the actual development of Sho 56-10033
In the method of No. 7, it is difficult to form the concave portion of the bottle body portion that fits into the lower end portion of the handle, the fitting is insufficient due to the imperfect shape, and the lower end portion of the handle is wrapped around when forming the bottle. There was a concern that the thickness would become thin and the strength would be insufficient. The present invention solves the above problems and provides a method for manufacturing a plastic bottle with a handle, which has good manufacturing efficiency, is relatively easy to mold, and has a handle firmly attached thereto.

[0004]

The first aspect of the present invention relates to a method of manufacturing a plastic bottle with a handle by biaxial stretch blow molding, as shown in FIGS. Main body preforming part (13) and handle (1
02) and pre-heated preform (1
0) is attached to a predetermined position in a blow molding die (500), and a handle fixing sheet (30) wider than the lower end portion (105) of the handle has a heat-sensitive adhesive layer on the back surface at the lower end portion of the handle. After inserting into a predetermined position in the blow molding die so as to face the outside, the bottle main body (103) is molded from the preform with a handle, and at the same time, as shown in FIG.
1 is a manufacturing method (100) of a plastic bottle with a handle shown in FIG. 1 in which the lower end of the handle is sandwiched between a bottle body and a sheet for fixing a handle and fixed, and a second invention is a handle by biaxial stretch blow molding. In the method for producing a plastic bottle with a cover, as shown in FIGS.
1) and a preheated preform (20) comprising a bottle body preforming part (23) having a grip engaging part (24)
And a separately molded handle (202) are inserted into a predetermined position in a blow molding die (600), and a handle fixing sheet (30) wider than the lower end of the handle (205) is attached to the back surface. After inserting the heat-sensitive adhesive layer in a predetermined position in the blow molding mold so that the heat-sensitive adhesive layer faces the outside of the lower end of the handle, at the same time as molding the bottle main body from the preform, the bottle main body and the upper end of the handle. FIG. 5 is a diagram in which the handle and the handle are fixed and the lower end of the handle is clamped between the bottle body and the handle fixing sheet.
It is a manufacturing method of the plastic bottle with a handle (200) shown in FIG. A third aspect of the present invention is a plastic bottle with a handle formed by biaxial stretch blow molding, in which the lower end of the handle is sandwiched between a bottle body and a sheet for fixing a handle and fixed.

The above-mentioned preform is formed by injection molding using a thermoplastic resin such as polyethylene terephthalate, polyolefin, or acrylonitrile resin which can be biaxially stretch blow molded.

The preheated preform is a preform that is heated near the stretching temperature in order to perform stretch blow molding of the bottle body preforming portion of the preform in the next step.

The handle fixing sheet is made of high-quality paper, coated paper, impregnated paper, synthetic paper (polystyrene, polypropylene), plastic sheet or the like as a sheet base material, and has strength enough to fix the handle. Acrylic resin, alkyd resin, ethylene / vinyl acetate copolymer, cellulose derivative, coumarone / indene resin, petroleum resin, polyamide resin, rubbers, styrene resin, terpene resin, vinyl resin, modified wax, etc. The heat-sensitive adhesive layer containing the main component is formed by coating, printing or the like.

[0008]

In the first aspect of the present invention, the preform with a handle whose bottle main body preforming portion is heated to near the stretching temperature is inserted into a predetermined position in the blow molding die and is wider than the lower end portion of the handle. After the handle fixing sheet is inserted into a predetermined position in the blow molding mold so that the heat-sensitive adhesive layer on the back surface faces the outside of the lower end of the handle, the preform bottle body preforming portion is stretched. It is blow-molded, expands toward the mold cavity surface, and is cooled on the mold cavity surface to form the bottle body. At this time, the surface temperature of the bottle main body melts the heat-sensitive adhesive layer on the back surface of the handle fixing sheet to provide adhesiveness. A portion of the handle fixing sheet that is wider than the lower end of the handle adheres to the surface of the bottle body. As the bottle body is cooled by the mold, the heat-sensitive adhesive layer also solidifies, and the gripping sheet firmly adheres to the bottle body. As a result, as shown in FIG.
The lower end portion (105) of the handle is sandwiched between the bottle body (103) and the handle fixing sheet (30) to be firmly fixed.

In the second aspect of the present invention, a preheated preform comprising a bottle body preforming portion having a mouth neck portion and a grip engaging portion and a separately molded grip are provided in a blow molding die. A handle fixing sheet wider than the lower end of the handle is attached at a predetermined position in the blow molding die so that the heat-sensitive adhesive layer on the back surface faces the outside of the lower end of the handle. After that, when the mold is clamped, the handle engaging part of the bottle main body preforming part is inserted into the engaging part of the handle with the bottle body, and the bottle main body preforming part of the preform heated near the stretching temperature is stretched. When blow-molded and expanded, the handle engaging portion of the bottle main body preforming portion also expands and fits into the engaging portion of the handle with the bottle body. The other bottle main body preforming portion further expands toward the mold cavity surface and is cooled on the mold cavity surface to form the bottle main body. Depending on the surface temperature of the bottle body at this time,
The heat-sensitive adhesive layer on the back surface of the handle fixing sheet is melted to give adhesiveness. A portion of the handle fixing sheet that is wider than the lower end of the handle adheres to the surface of the bottle body. As the bottle body is cooled by the mold, the heat-sensitive adhesive layer also solidifies, and the gripping sheet firmly adheres to the bottle body.
As a result, as in the case of the first aspect of the present invention, the lower end of the handle is clamped between the bottle body and the handle fixing sheet to be firmly fixed.

[0010]

【Example】

<Example 1> First, a preform (10) with a handle including a mouth / neck part (101), a bottle body preforming part (13), and a handle (102) shown in FIG. 3 was polyethylene terephthalate by an injection molding method. (PET) was used.

Next, the prepared preform with a handle is
After fixing and suspending to the mouth and neck of the mouth and neck mold (510) and preheating the bottle preforming part of the preform to a stretching temperature of 100 ° C. by the preheating device, the mouth and neck mold shown in FIG. Body type (520, 530), bottom type (54
It moved into the blow mold (500) of the quarter mold of (0). Outside the grip bottom end (105) mold (52
On the cavity surface of 0), a handle fixing sheet with an acrylic heat-sensitive adhesive layer formed on the back side that is wider than the lower end of the handle is attached by a vacuum method in advance and placed inside the handle. The part (521) of the body part die (520) has a slide core structure so as to project into the inside of the die and form a cavity surface only when the die is closed. After the mold was clamped, the bottle preforming part of the preform with a handle was stretch blow-molded to produce a PET bottle with a handle of 2,000 ml.

The prepared PET bottle with a handle has 2,000
It was filled with 0 ml of water and drained repeatedly from the mouth with the handle, but the lower end of the handle is firmly fixed by the bottle body and the handle fixing sheet, and the lower end of the handle should come off from the bottle body. There was no.

<Embodiment 2> First, a preform (20) consisting of a mouth neck portion (201) and a bottle body preforming portion (23) having a grip engaging portion (24) shown in FIG.
Polyethylene terephthalate (PE
T) was used. Separately from this, a handle was made using polypropylene by an injection molding method.

Next, the prepared preform is suspended by fixing the mouth and neck with a mouth and neck mold (610) and preheating the bottle preforming portion to a stretching temperature of 100 ° C. by a preheating device. Mouth and neck type shown in 7, body part type divided into left and right (620,
630) and moved to the blow mold (600) of the bottom mold (540). The separately prepared handle is inserted into the body mold (620) at a predetermined position, and the lower end of the handle (205) is attached to the cavity surface of the outer body mold (620) on a back surface wider than the lower end of the handle. A handle fixing sheet having an acrylic heat-sensitive adhesive layer formed thereon is inserted and placed by a vacuum method, and a body (620) portion (621) inside the handle has a slide core structure. , When the molded product is discharged, the molded product can be discharged by retracting inside the mold. After the mold is clamped, the bottle preforming part of the preform with a handle is stretch blow molded to obtain 2,000 ml.
A PET bottle (200) with a handle was prepared.

The prepared PET bottle with a handle has 2,000
It was filled with 0 ml of water and drained repeatedly from the mouth with the handle, but the upper end of the handle is firmly engaged with the handle engaging part of the bottle body, and the lower end of the handle is the bottle. It was firmly fixed by the body and the handle fixing sheet, and neither the upper end nor the lower end of the handle did not come off from the bottle body.

[0016]

When the plastic bottle with the handle is manufactured by the manufacturing method of the present invention, there is no need to attach the handle afterwards, the manufacturing efficiency is good, and the moldability of the handle engaging portion of the bottle body is good. Moreover, a plastic bottle with a handle can be obtained with the handle firmly attached. In addition, information about the product can be written on the surface of the handle fixing sheet.

[Brief description of drawings]

FIG. 1 is an example 1 manufactured by a manufacturing method of the present invention.
It is a partial front view of the plastic bottle with a handle.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of the lower end of the handle of the plastic bottle with a handle of the first embodiment.

FIG. 3 is a side view of the preform with a handle produced in Example 1.

FIG. 4 is an explanatory diagram showing a state when the preform with a handle and the handle fixing sheet in Example 1 are inserted and attached in a blow mold.

FIG. 5: Example 2 manufactured by the manufacturing method of the present invention
It is a partial front view of the plastic bottle with a handle.

FIG. 6 is a side view (a) of a preform with an engaging portion that engages with a handle manufactured in Example 2 and a side view (b) of a handle formed separately.

FIG. 7 is an explanatory view showing a state when the preform with an engaging portion and the handle fixing sheet in Example 2 are inserted into a blow mold.

FIG. 8 is a partial front view of a conventional plastic bottle with a handle.

FIG. 9 is a partial front view of another conventional plastic bottle with a handle.

[Explanation of symbols]

10, 20 …… Preform 13, 23 …… Bottle main body preforming part 24, 204 …… Engagement part 30 …… Handle fixing sheet 100, 200, 300, 400 …… Plastic bottle with handle 101, 201, 301 , 401 ... mouth and neck 102, 202, 302, 402 ... handle 103, 203, 303, 403 ... bottle main body 105, 205 ... handle lower end 500, 600 ... mold 510, 610 ... mouth and neck Part type 520, 530, 620, 630 ... Body part type 521, 621 ... Slide core structure part 540, 640 ... Bottom type

Claims (3)

[Claims] 1. A method of manufacturing a plastic bottle with a handle by biaxial stretch blow molding, wherein a preheated preform with a handle consisting of a mouth neck part, a bottle body preforming part and a handle is provided in a blow molding die. The handle fixing sheet wider than the lower end of the handle is attached to a predetermined position in the blow mold so that the heat-sensitive adhesive layer on the back surface faces the outside of the lower end of the handle. A method for producing a plastic bottle with a handle, characterized in that the bottle main body is molded from the preform with a handle, and at the same time, the lower end of the handle is clamped and fixed between the bottle body and the handle fixing sheet. 2. A method of manufacturing a plastic bottle with a handle by biaxial stretch blow molding, wherein a preheated preform comprising a bottle body preforming part having a mouth neck part and a handle engaging part, and a handle molded separately. And is inserted into a predetermined position in the blow molding die, and a handle fixing sheet wider than the lower end portion of the handle is formed so that the heat-sensitive adhesive layer on the back surface faces the outside of the lower end portion of the handle. After inserting into a predetermined position in the mold, at the same time as molding the bottle body from the preform, engage the bottle body and the upper end of the handle,
A method of manufacturing a plastic bottle with a handle, characterized in that the lower end of the handle is sandwiched between the bottle body and the handle fixing sheet and fixed. 3. A plastic bottle with a handle by biaxial stretch blow molding, wherein the lower end of the handle is sandwiched between a bottle body and a sheet for fixing the handle and fixed, and fixed.