JPH11268721A - Delamination bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a slit at the bottom of a bottle while preventing the slit from being narrowed. SOLUTION: For a delamination bottle A formed of an outer layer 1 made of rigid synthetic resin serving as a material and an inner layer 2 that is separable from the outer layer 1, the bottom part thereof is made up of a bottom end peripheral wall 10 and a flat bottom wall, and the flat bottom wall is formed of an upper wall 11a and a lower wall 11b with a difference in level provided at its parting line, and the outer layer 1 and the inner layer 2 are stuck together at the upper wall 11a while the outer layer 1 and the inner layer 2 are separated each other at the lower wall 11b after molding of the bottle and a slit is formed thereat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delamination bottle, and more particularly to a delamination bottle whose outer layer is blow-molded using a hard synthetic resin such as PP or PETG as a material.

[0002]

2. Description of the Related Art A laminated blow bottle comprising an outer layer and an inner layer which can be peeled off from the outer layer, wherein after blow molding, an external force is applied from the outside to a parting line at the bottom of the bottle. A delami bottle having a slit formed between an inner layer and an outer layer on a parting line has been conventionally known as disclosed in, for example, JP-A-5-310265. The above-mentioned known delami bottle uses high-density polyethylene for the outer layer and nylon for the inner layer, and the formation of the slit is easily performed by pushing the parting line from the outside with a push rod after the bottle is formed. .

[0003]

However, when a hard synthetic resin such as PP or PETG is used for the outer layer,
There is a problem that a slit is not formed only by pressing the parting line from the outside. Also, even if the slit is formed by increasing the pressing force, the flat bottom walls on both sides of the parting line are restored after the slit is formed, and the slit is narrowed, so that the air is smoothly sucked from the slit when the contents are poured out. There was also the problem of not being done.

An object of the present invention is to provide a derailleur bottle having a technical problem to solve the above problems, in which a step is provided on a flat bottom wall on both sides of a parting line at the bottom of the bottle, and a slit is formed in a lower wall. Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides, as a delami bottle, an outer layer made of a hard synthetic resin, and an inner layer detachable from the outer layer. Wherein the bottom of the bottle comprises a bottom end peripheral wall and a flat bottom wall, the flat bottom wall is provided with a step in the parting line, and is formed of an upper step wall and a lower step wall, and the upper step wall is The outer layer and the inner layer are adhered to each other, and the lower wall has a structure in which the outer layer and the inner layer are separated from each other after the bottle is formed, and a slit is formed.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, A
Is a delamination bottle composed of an outer layer 1 and an inner layer 2, which is formed by laminated extrusion blow. The outer layer 1
A hard synthetic resin such as PP or PETG is used as a material resin. The inner layer 2 is made of a material resin such as PE, nylon, E / VAL or the like, and is an inner bag that can be peeled off and deformed from the outer layer 1.

[0007] Between the outer layer 1 and the inner layer 2, an adhesive band 3 is arranged at a predetermined location in order to cause the inner layer to peel and deform by following a certain shape change when the contents are poured out. Has been established. In addition, depending on the resin, an adhesive layer may be provided inside the inner layer in the same way as the conventional one in order to enhance the fusion between the inner layers in the parting line.

[0008] As shown in FIGS.
Comprises a mouth 4, an elliptical body 5 and a bottom 6, and the mouth 4 is provided with a screw 7 and a holding ridge 8. The bottom 6 includes a bottom end peripheral wall 10 and a flat bottom wall 11 that is recessed from the bottom end peripheral wall 10.
Has a step on the parting line PL, and an upper step wall 11a and a lower step wall 11b are formed on both sides of the parting line PL. On the parting line PL, the pinch-off portions of the bottom portions 2a and 2b of the inner layer are fused together to form a fused portion 2c. The bottom 1a of the outer layer and the bottom 2a of the inner layer of the upper wall 11a are joined, and the bottom 1b of the outer layer and the bottom 2 of the inner layer of the lower wall 11b are joined.
b is peeled off after the bottle is formed, and the slit 12 is formed.

Next, a method of forming the delaminated bottle of the present invention will be described. Although the bottle is formed by lamination extrusion blow molding, as shown in FIG. Upper surface 21a
Are formed to protrude from the other upper surface 21b. At the time of blow molding, the molten parison is vertically shifted and fused by the pinch-off portions 20a and 20b, and the flat bottom wall 11 of the bottle bottom 6 is attached to the bottom 2a of the inner layer of the parison.
b form a fusion part 2c having a substantially isosceles triangular cross section, and the fusion surface 2d is slightly inclined. The bottoms 1a and 1b of the outer layer of the parison are bonded to the bottoms 2a and 2b of the inner layer facing each other, and are shifted vertically with the fusion portion 2c interposed therebetween.

After the blow molding, the molded bottle is conveyed to a slit forming step, and as shown in FIG. 6, a jig C provided with a raised portion C1 which engages with the upper step wall 11a of the bottle bottom portion 6 is replaced with a bottle. Pressed against bottom 6. In the jig C, the raised portion C1 pushes up the upper step wall 11a, and as shown in FIG. 6 (b), the bottom 1a of the outer layer and the bottom 2a of the inner layer of the upper step wall 11a remain fused while the lower step 11b, the bottom 2a of the inner layer and the bottom 1b of the outer layer are peeled off, and the slit 1
2 are formed.

At this time, a step is formed between the upper step wall 11a and the lower step wall 11b, and when the slit 12 is formed, only the upper step wall 11a is greatly deformed.
Even if the upper step wall 11a is restored to some extent when the content liquid is filled, distortion at the time of deformation remains, and the slit 12 is not completely closed. Next, if necessary, delamination air is injected through the slit 12 to perform initial delamination.

When using the delami bottle, a pump dispenser is attached to the mouth 4 of the delami bottle A, and the atmosphere is introduced from the slit 12 in accordance with the discharge of the contents. As the dispensing progresses, the inner layer 2 peels off from the outer layer 1 and the volume in the inner layer 2 decreases, and the outer layer 1 almost completely pours out all the contents while maintaining the outer shape of the container. Become.

[0013]

Since the present invention is configured as described above, it has the following effects. At the bottom of the bottle, a step is provided across the parting line, and only the upper wall is greatly deformed by the jig to form the slit, so the slit is formed reliably, and the slit narrows due to the restoration of the upper wall There is no.

[Brief description of the drawings]

FIG. 1 is a side view of a delami bottle of the present invention.

FIG. 2 is a front view of the delami bottle.

FIG. 3 is a bottom view of the delami bottle.

FIG. 4 is an enlarged side view of a bottle bottom.

FIG. 5 is an enlarged side view of the bottom of the bottle when the bottle is formed.

FIG. 6 is an explanatory view when forming a slit using a jig, and FIG.
FIG. 2B is a diagram before formation, and FIG.

[Explanation of symbols]

 A Delamination Bottle B Blow Mold C Jig C1 Ridge PL Parting Line 1 Outer Layer 1a, b Bottom of Outer Layer 2 Bottom of Inner Layer 2a, b Bottom of Inner Layer 2c Fused Part 2d Fused Surface 3 Adhesive Band 4 Mouth Reference Signs List 5 trunk 6 bottom 7 screw 8 holding ridge 10 bottom end peripheral wall 11 flat bottom wall 11a upper step wall 11b lower step wall 12 slit 20a, b pinch-off part 21a, b upper surface of pinch-off part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Yoshio Akiyama, 380 Sannomiya, Isehara, Kanagawa Prefecture, Japan Yoshino Kogyo Co., Ltd.Kanagawa Technical Research Institute Co., Ltd. Inside plant (72) Inventor Masato Seguchi 480 Kishii, Buzen-shi, Fukuoka Yoshino Industry Co., Ltd.Fukuoka Plant

Claims (1)

[Claims] 1. An outer layer made of a hard synthetic resin,
A delamination bottle comprising a peelable inner layer with respect to the outer layer, wherein the bottle bottom comprises a bottom end peripheral wall and a flat bottom wall, and the flat bottom wall comprises:
A step is provided in the parting line, and is formed from an upper wall and a lower wall. And a slit is formed, and a slit is formed.