JP3406998B2 - Bottle with cap and molding method of bottle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an inner layer forming a deformable inner bag which is releasably laminated inside an outer layer forming a regular outer shell without causing a change in appearance and shape. The present invention relates to a blow bottle body made of synthetic resin with a cap, which allows the content liquid to be poured out without allowing outside air to enter the content liquid storage section, and a method for molding this bottle body.

[0002]

2. Description of the Related Art In a blow molding bottle made of synthetic resin, in which an inner layer forming a deformable inner bag is releasably laminated in an outer layer forming a regular outer shell, the inner volume of the inner layer is reduced. In order to prevent the accompanying deformation, that is, the crushing deformation from becoming indefinite, the outer layer and the inner layer are fixed by adhesion or the like at a part of the outer layer and the inner layer, for example, at least in the mouth cylinder part and the bottom part of the bottle body. (See Japanese Patent Laid-Open No. 4-339759).

In this type of laminated bottle, in the case of a bottle 1 provided with a cap 10 with a pump as shown in FIG. 5, the outer layer 2 and the inner layer 3 are fixed to each other by the inner layer 3 at the mouth tube portion 4. The upper end portion is located on the upper end surface of the outer layer 2 and the outer layer 2
This is achieved by sandwiching the upper end portion of the inner layer 3 located on the upper end surface between the packing 12 in the cap 10 and the upper end surface of the outer layer 2.

As a method of positioning the upper end of the inner layer 3 on the upper end surface of the outer layer 2, conventionally, a UPI (upper plug-in) molding method, that is, as shown in FIG. 6, is set in a blow molding die 13. From above the mouthpiece 4
By pushing in the heated plug 14, the upper end portion of the inner layer 3 which has been provided in advance is bent outward to be laminated on the upper end surface of the outer layer 2, and then the neck burr which is an unnecessary portion of the upper end of the mouth tube portion 4 is removed. A molding method of cutting and removing has been adopted.

[0005]

However, in the UPI molding method as the prior art, it is necessary to achieve the blow molding of the bottle body 1 and the press molding of the upper end portion of the mouth tube portion 4 by the plug 14 substantially at the same time. There has been a problem that the processing operation becomes troublesome and a high molding dimensional accuracy between the blow mold 13 and the plug 14 is required.

Further, since the mouth tube portion 4 of the bottle body 1 is formed by pressing the plug 14 from above into the opened upper end portion of the parison in a soft state (molten state), the molding is highly stable. However, there is a problem that molding defects are likely to occur due to slight changes in conditions.

Therefore, the present invention was devised in order to solve the above-mentioned problems in the prior art, and it is technically possible to easily form the upper end of the inner layer sandwiched between the cap and the upper end surface of the outer layer. An object of the present invention is to easily and surely fix the outer layer and the inner layer at the upper end of the bottle mouth cylinder portion, and to enable stable and reliable molding.

[0008]

The structural means of the present invention for solving the above technical problems is, by blow molding, an outer layer made of a synthetic resin forming an outer shell of a fixed shape, and releasably laminated on this outer layer, It is composed of an inner layer made of a flexible synthetic resin that forms an inner bag, and at the upper end of the mouth cylinder part in which a thread is engraved on the outer peripheral surface,
Curved and inverted from the inside to the outside edge of the inversion flange with the inner layer positioned on the upper surface, a short tube-shaped open-ended tube piece having an outer diameter not larger than the mouth tube was erected continuously. Having a bottle with an open end, an inner ring that presses the lower end edge of the integrally-installed leg cylinder piece against the upper surface of the reversing flange of the bottle in the state of externally screwed to the mouth cylinder of this bottle. To have a cap to have.

The upper surface of the reversing flange of the bottle is preferably flat, and it is effective to use the inner ring of the cap as an assembly portion for the pump cap assembled to the cap.

Further, the method means of the present invention for solving the above technical problem is an outer layer made of a synthetic resin forming a regular outer shell and a flexible layer which is releasably laminated on the outer layer to form an inner bag. It relates to a method of blow molding a bottle from a synthetic resin inner layer, and the inside of the curve is reversed from the inside to the outside at the upper end of the cylindrical mouth tube where the bottle cap is screwed and assembled. By arranging a burr cylinder piece, which is a neck burr having an outer diameter not larger than the mouth cylinder, upright from the outer peripheral edge of the reversing flange via the reversing flange having the inner layer positioned on the upper surface, This burr cylinder piece is cut and removed while leaving the lower end of the burr cylinder piece as an open end cylinder piece.

[0011]

[Function] The open end, which is continuously provided on the upper end of the mouth cylinder of the bottle, has an upper surface of a reversal flange formed by curving and reversing from the inner side to the outer side while maintaining the laminated structure of the outer layer and the inner layer. The inner layer is formed, and the inner layer is formed on the inner surface of the open end cylinder piece that is erected continuously from the outer peripheral edge of the inversion flange.

When the cap is screwed and assembled to the mouth tube portion of this bottle, the leg tube piece of the inner ring as a packing of the cap is opened with the lower end edge thereof being in contact with the upper surface of the reversing flange. By fitting into the tube piece and screwing it into the mouth tube part of the cap, that is, by screwing, the leg tube piece of the inner ring presses its lower end edge against the inner layer forming the upper surface of the inversion flange, The part is strongly clamped and fixed to the outer layer.

When the cap is screwed onto the mouth tube portion of the bottle, the opening end tube piece connected to the upper end of the mouth tube portion has a larger opening end tube piece than the mouth tube section having the outer peripheral surface provided with threads. Since the outer diameter is regulated so as not to be large, the screwing operation of the cap with respect to the mouth tube portion can be smoothly achieved without any trouble.

The burr cylinder piece is integrally molded with the bottle as a neck burr at the time of blow molding the bottle, and is a burr cylinder which is a continuous portion to the bottle after completion of the blow molding operation of the bottle. The lower end portion of the piece is left as an open end tubular piece in the bottle, and is cut off at the lower end to be cut from the bottle.

The burr cylinder piece is a cylindrical neck burr that is continuously provided upright from the outer peripheral edge of the reversing flange that constitutes the opening end of the blow-molded bottle body. There is no difficulty, and the blow molding operation may be the same as a normal blow molding operation, and since it has a simple cylindrical shape, the cutting and removing process with the lower end portion left as an open end tubular piece becomes simple and accurate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a semi-longitudinal view showing a bottle body 1 in which a cap 10 with a pump is screwed and assembled to the bottle body 1 and a main body portion of the cap 10. The bottle body 1 is an outer layer 2 made of high-density polyethylene resin. And the inner layer 3 made of nylon are blow-molded from a parison extruded into a laminated cylindrical shape by coextrusion molding means, and a cap 10 is screwed and assembled to the outer peripheral surface of the mouth tube portion 4 having a cylindrical shape. A thread for engraving is engraved.

As shown in FIG. 2, at the upper end of the mouth tube portion 4,
A ring-shaped reversing flange 6 having a flat upper surface in a state where an outer peripheral groove 7 is formed immediately below, which is formed by reversing the upper end portion of the mouth tube portion 4 from the inside to the outside,
An open end portion 5 composed of an open end cylindrical piece 8 standing upright in a short cylindrical shape from the outer peripheral edge of the reversing flange 6 is integrally connected.

Since the reversing flange 6 of the opening end 5 is formed by reversing the upper end of the mouth tube 4 from the inside to the outside, the upper end of the inner layer 3 is formed on the upper surface thereof. Therefore, when the cap 10 is screwed and assembled to the mouth tube portion 4, the inner ring 1 of the cap 10 is positioned.
The upper end portion of the inner layer 3 is firmly sandwiched and fixed between the lower end edge of the leg cylinder piece of 1 and the upper end portion of the outer layer 2, and the upper end portion of the inner layer 3 in the mouth cylinder portion 4 including the open end portion 5 with respect to the outer layer 2 Achieve immobile fixation.

When sandwiching the upper end of the inner layer 3 by the inner ring 11 of the cap 10 and the upper end of the outer layer 2, the outer peripheral groove 7 formed immediately below the reversing flange 6 functions to impart elasticity to the reversing flange 6. Therefore, the immobilization of the upper end of the inner layer 3 can be made firmer and more stable.

The inner ring 11 of the cap 10 is formed so as to form a part of an assembly portion of the pump, which is assembled to the cap 10, with respect to the cap 10, and also has a function as a packing. A leg tube piece having a height larger than that of the opening end tube piece 8 of the opening end part 5 is provided so as to hang down from a lower surface peripheral end part of a ring flat plate-shaped main body part integrally provided in an outer flange shape, The integrally formed leg cylinder piece has an outer diameter slightly smaller than the inner diameter of the open end cylinder piece 8.

FIGS. 3 and 4 show an essential part of an example of a method for molding the bottle body 1 of the embodiment shown in FIGS. 1 and 2, and when the bottle body 1 is blow molded, A burr cylinder piece 9 as a neck burr is integrally formed by blow molding of the bottle body 1.

The burr cylinder piece 9 blow-molded integrally with the bottle body 1 has a cylindrical shape which is continuously provided upright from the outer peripheral edge of the reversing flange 6 of the bottle body 1, and has a mouth tube of the bottle body 1. The outer diameter is equal to the outer diameter of the portion 4.

The burr cylinder piece 9 which is the neck burr integrally blow-molded with the bottle body 1 has a cutting position K which is as close to the reversing flange 6 as possible after the completion of the blow molding process of the bottle body 1. Although it is cut off from the bottle body 1 by being cut by (see FIG. 3), the lower end portion of the burr cylinder piece 9 left in a state of being continuously provided on the bottle body 1 side with the outer peripheral edge of the reversing flange 6 is As it is, it becomes the open end cylinder piece 8 (see FIG. 4) of the open end portion 5.

The burr cylinder piece 9 is cut by the reversal flange 6
Using the upper surface of the above as a reference for positioning the cutting position, it is achieved by a normal cutting means at a height position where sufficient safety can be secured without damaging the inner layer 3 portion forming the upper surface of the inversion flange 6.

[0025]

Since the present invention has the above-mentioned structure, it has the following effects. At the opening end connected to the upper end of the mouth cylinder, an inversion flange that was curved inward from the inside to the outside was provided, and the upper surface of this inversion flange was used as a packing round. Therefore, in the state where the cap is screwed and assembled to the mouth tube portion, the upper end of the inner layer is firmly clamped and fixed between the inner ring of the cap and the upper end of the outer layer. It is possible to firmly and securely achieve immobile fixation to the outer layer at the upper end portion of the mouth tube portion, that is, the opening end portion.

Since the reversing flange at the opening end is formed by reversing the upper end portion of the mouth tube portion from the inside to the outside, the width thereof can be set by appropriately setting the inward bending curve. Can be freely set to a desired value, so that the position where the cap is clamped and fixed at the upper end of the inner layer can be easily and properly obtained.

The molding of the reversal flange at the opening end can be easily and surely achieved by molding the burr cylinder piece which is the neck burr which is blow-molded integrally with the bottle body, and the molding of the opening end is possible. Can be easily and accurately achieved by simply cutting and removing the burr cylinder piece while leaving the bottom end part of the burr cylinder piece simple, while maintaining high safety with almost no defective products. Can be achieved.

Since the inner ring having the leg tube piece is used as a packing instead of the packing, the inner ring upper end portion is securely and strongly clamped and fixed by the inner ring without being disturbed by the opening end tube piece at the opening end portion of the bottle. Therefore, it is possible to surely achieve the strong immovable assembly of the inner layer with respect to the outer layer at the mouth portion of the bottle, and it is possible to obtain good and smooth shrinkage deformation of the inner layer.

[Brief description of drawings]

FIG. 1 is a right half longitudinal sectional view of a cap main body and a bottle showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the embodiment shown in FIG.

FIG. 3 is a partially enlarged view of the bottle molding method of the embodiment shown in FIG. 1 before cutting a burr cylinder piece.

FIG. 4 is a partially enlarged view of the embodiment shown in FIG. 3 after excising a burr cylinder piece.

FIG. 5 is a right half longitudinal sectional view of a cap main body and a bottle, showing a conventional example.

FIG. 6 is a longitudinal sectional view of an essential part showing a molding method of the conventional example shown in FIG.

[Explanation of symbols]

1; Bottle 2; outer layer 3; Inner layer 4; Mouth tube 5; Open end 6; Inverted flange 7; Perimeter groove 8; Open end tube piece 9; Bali barrel piece 10; Cap 11; Inner ring 12; Buckin 13; blow mold 14; Plug K; Cut position

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 77/06 B29C 49/00-49/80 B65D 83/76

Claims (4)

(57) [Claims] 1. An outer layer (2) made of synthetic resin that forms a fixed outer shell by blow molding, and a flexible synthetic resin that is releasably laminated on the outer layer (2) to form an inner bag. The inner layer (3) is composed of the inner layer (3) and the outer peripheral surface of which the thread is engraved.
(3) is located at the outer peripheral edge of the reversing flange (6), and an opening is formed by vertically arranging a short tubular opening end tubular piece (8) having an outer diameter not larger than the mouth tubular portion (4). Bottle with end (5)
(1) and a cap (10) having an inner ring (11) that presses the lower end edge of the integrally-installed leg cylinder piece against the upper surface of the reversing flange (6) in an externally threaded state with respect to the mouth cylinder part (4). )
Bottle body with a cap. 2. The bottle with a cap according to claim 1, wherein the upper surface of the reversing flange (6) is a flat surface. 3. The bottle bottle with a cap according to claim 1, wherein the inner ring (11) is an assembly part of the pump assembled to the cap (10) with respect to the cap (10). 4. An outer layer made of a synthetic resin forming a regular outer shell.
When the bottle body (1) is blow molded from the (2) and the inner layer (3) made of a flexible synthetic resin that is detachably laminated on the outer layer (2) and forms the inner bag, the cap (10) At the upper end of the cylindrical mouth tube part (4) to which is screwed and assembled, the inversion flange with the inner layer (3) positioned on the upper surface is curved and inverted from the inside to the outside.
A burr cylinder piece (9), which is a neck burr having an outer diameter not larger than that of the mouth cylinder part (4), is erected from the outer peripheral edge of the reversing flange (6) through (6). , The burr cylinder piece (9)
A method for forming a bottle, wherein the lower end portion of the burr cylinder piece (9) is left as an open end cylinder piece (8) and cut and removed.