JP3413507B2 - 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 synthetic resin blow-molded bottle body capable of pouring out the content liquid without allowing outside air to enter the content liquid storage section.

[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, a part of the outer layer and the inner layer, for example, at least at the mouth and bottom of the bottle, the outer layer and the inner layer are fixed by adhesion or the like ( See Japanese Patent Laid-Open No. 4-339759).

Further, in this type of laminated bottle, in the case of the bottle 1 having the cap 7 with a pump as shown in FIG. 5, the outer layer 2 and the inner layer 3 are fixed to each other at the mouth portion 5 by the inner layer 3.
The outer flange portion 6 is formed on the upper end of the outer layer 2 and is laminated on the upper surface of the outer layer 2, and the outer flange portion 6 is sandwiched between the packing 8 in the pump cap 7 and the upper surface of the outer layer 2. ing.

As a method of molding the outward flange portion 6 on the upper end of the inner layer 3 and positioning it on the upper end surface of the outer layer 2, conventionally, a UPI (upper plug-in) molding method, that is, as shown in FIG. By pushing in the heated plug 10 from above the bottle mouth portion 5 set in the molding die 9, the upper end portion of the inner layer 3 which has been provided in advance is bent outward and laminated on the upper end surface of the outer layer 2. Then, the molding method of cutting and removing the unnecessary portion at the upper end of the mouth portion 5 was adopted.

[0005]

However, the UPI molding as a conventional technique is complicated and troublesome, the molding reliability is poor, and an extra material is required at the upper end of the mouth portion, resulting in a high material cost. There was a problem.

Therefore, the present invention was devised to solve the above-mentioned problems in the prior art, and it is possible to easily form the upper edge of the inner layer sandwiched between the cap and the upper edge of the outer layer. Therefore, it is an object of the present invention to provide a bottle body capable of easily and reliably fixing the outer layer and the inner layer at the upper end of the bottle mouth portion at low cost.

[0007]

Means for Solving the Problems The means of the present invention for solving the above technical problem is to provide an outer layer made of synthetic resin that forms an outer shell of a fixed shape by blow molding, and an outer layer that is releasably laminated on the outer layer. It is composed of an inner layer made of flexible synthetic resin that forms a bag, and is a bottle body in which a cap with a pump is screwed and assembled to a cylindrical mouth portion at the upper end, there outward protrusion to position slightly lower than the upper end surface of the outer layer circumferentially to that, to sandwich the outward protrusion by the upper end inner peripheral surface of the outer layer of the packings and the mouth portion of the pump cap, the .

It is preferable that the outwardly projecting piece is formed in an outwardly inclined slope shape or is outwardly curled and curved.

[0009]

The outer projecting piece on the upper end of the inner layer, which is located slightly lower than the upper end surface of the outer layer, has a packing that is elastically deformed along the shape of the upper end of the mouth by screwing the cap with the pump onto the mouth. It is sandwiched by the inner peripheral surface at the upper end of the outer layer, and immovable fixation of the inner layer and the outer layer at the mouth is achieved.

[0010]

1 and 2 show a first embodiment of the present invention. Bottle 1 is outer layer 2 made of high density polyethylene resin
And nylon inner layer 3 are blow-molded from a parison extruded into a laminated cylindrical shape by a co-extrusion molding means, and a cap 7 with a pump is screwed on the outer peripheral surface of the cylindrical mouth portion 5. Threads for engraving are engraved.

On the inner peripheral side of the upper end of the mouth portion 5, an inclined surface 2a is provided around the upper inner peripheral surface of the outer layer 2, and the inclined surface 2 is formed.
The upper end of the inner layer 3 is bent outward so as to be in close contact with a, and an outwardly projecting piece 4 is provided around the upper layer.

The outward protruding piece 4 of the inner layer 3 has a relatively soft packing 8 made of rubber or the like when the cap 7 with a pump is screwed to the mouth portion 5, and the inner peripheral surface of the upper end of the outer layer 2 < The inner layer 3 and the outer layer 2 are fixed to each other in the mouth portion 5 because they are sandwiched by.

FIG. 2 shows a method of forming the inner periphery of the upper end of the mouth portion 5. The forming jig 11 having the inclined surface 12 provided at the lower end of the outer periphery is heated and pushed into the mouth portion 5, and the inclination is obtained. By pressing the inner periphery of the upper end of the mouth portion 5 with the surface 12, the inclined surface 2a of the outer layer 2 and the outwardly projecting piece 4 of the inner layer 3 are formed.

FIGS. 3 and 4 show a second embodiment of the present invention. In the second embodiment, a step portion 2b is provided around the inner peripheral surface of the upper end of the outer layer 2, and the upper end of the inner layer 3 is closely attached to the curved convex bottom surface of the step portion 2b. Is curled outwardly and an outwardly projecting piece 4 is provided around it.

FIG. 4 shows a method of forming the inner periphery of the upper end of the mouth portion 5 according to the second embodiment. The outer peripheral lower end of the forming jig 13 has a stepped portion 14 provided with a curved concave surface 15 on the upper side. Around the
By heating the molding jig 13 and pushing it into the mouth portion 5, the stepped portion 2b of the outer layer 2 and the curled outward protruding piece 4 of the inner layer 3 are molded.

[0016]

Since the present invention has the above-mentioned structure, it has the following effects. Since the upper end portion of the inner layer, which is sandwiched and fixed by the packing of the cap with a pump and the upper inner peripheral surface of the outer layer, is an outward projecting piece located slightly lower than the upper end surface of the outer layer, an opening including this outward projecting piece. The upper end of the part can be easily and reliably molded by a simple molding jig.

Since no extra material is required for the upper end portion of the mouth when molding the outward projecting piece, it is possible to reduce the expensive synthetic resin material required for molding one bottle. In addition, cost reduction can be achieved, and an extra incidental portion cutting and removing process is not required, so that the manufacturing process is simplified and the manufacturing facility is also simplified.

[Brief description of drawings]

FIG. 1 is a semi-longitudinal sectional view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an essential part showing a molding method of the embodiment shown in FIG.

FIG. 3 is a semi-longitudinal sectional view of essential parts showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an essential part showing a molding method of the embodiment shown in FIG.

FIG. 5 is a semi-longitudinal sectional view of 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 2a; inclined surface 2b; step 3; Inner layer 4; Outward protrusion 5; Mouth 6; Outward flange 7; Cap with pump 8; packing 9; Blow molding die 10; Plug 11; Molding jig 12; Inclined surface 13; Molding jig 14; Step 15; curved concave surface

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 47/34 B32B 1/02 B32B 7/06 B65B 53/02 B65D 1/02

Claims (3)

(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. A bottle body consisting of an inner layer (3) and a cap (7) with a pump screwed into a cylindrical mouth (5) that is connected to the upper end, and the inner layer of the mouth (5) (5). 3) At the upper end, an outward projecting piece (4) located slightly lower than the upper end surface of the outer layer (2) is provided around, and the packing (8) of the pump cap (7) and the outer layer (2) are provided.
A bottle body formed by sandwiching the outward projecting piece (4) with the inner peripheral surface of the upper end . 2. The bottle according to claim 1, wherein the outwardly projecting piece (4) is formed in an upwardly sloping slope. 3. The bottle according to claim 1, wherein the outwardly projecting piece (4) is outwardly curled and curled.