JP2000313465A - Thin-walled blow-molded bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-walled blow-molded bottle in which a pump can be fixed to an opening part and a buckling strength of a bottle barrel part is reinforced under utilization of a sucking pipe of the pump. SOLUTION: This thin-walled bottle A is molded with a synthetic resin of which resin weight per unit volume of the bottle A is 0.03 g/ml to 0.015 g/ml and a pump B can be fixed to its opening port. The pump B is comprised of a piston, a cylinder 31 and a suction pipe 34 suspended from the lower end of the cylinder 31. The lower end 35 of the suction pipe 34 of the pump B is contacted with an inner surface of the bottom wall of the bottle A to reinforce the buckling strength of the bottle A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-wall bottle, and more particularly to a thin-wall blow bottle having a mouth and a replaceable pump.

[0002]

In recent years, the recycling of plastic molding materials has been promoted along with their savings, and thinning of the bottles has been demanded from the viewpoint of crushing and collecting waste bottles. Thin-walled bottles that can be crushed and discarded are also known.

However, in the case of a conventional thin bottle, for example, in the case of PP, the resin weight per unit capacity is 0.065.
g / ml, but in order to further reduce the molding material and facilitate crushing, the resin weight was set to 0.05 g / ml or less,
Further, when the thickness is set to 0.03 g / ml or less as an ultra-thin bottle, there is a problem that it is difficult to maintain shape retention as a bottle.

[0004] Further, ultra-thin bottles have insufficient strength to be directly attached to a pump and used as a liquid discharging container.
It was considered to be used only as a refill bottle for replacing the content liquid.

[0005] However, if the refill bottle becomes extremely thin, it is necessary to hold the bottle by grasping the shoulder and body when removing the cap. There was a possibility that the liquid would overflow and the main body of the liquid discharging container or its surroundings would be soiled.

In order to solve this problem, an ultra-thin bottle whose mouth portion can be easily held has been proposed. However, since the bottle is used as a refillable bottle, it is necessary to remove a pump and a refillable bottle cap from the liquid dispensing container main body. Injecting the content liquid into the main body of the liquid discharging container and mounting the pump are troublesome, and are cumbersome in the same manner as conventional thin-walled refillable bottles. Further, when a pump is attached to the mouth and used as a liquid discharging container, there is a problem that the bottle is deformed or further buckles when the pump is operated.

An object of the present invention is to solve the above-mentioned problems, and to make the wall surface extremely thin so that it can be easily crushed,
In ultra-thin bottles with reinforced body and bottom to maintain shape retention and easy to hold the mouth, a pump can be attached to the mouth and the bottle body is made using the suction pipe of the pump. It is an object of the present invention to provide a thin-walled blow bottle in which buckling strength is further enhanced.

[0008]

In order to solve the above-mentioned problems, the present invention provides a thin-walled blow bottle having a resin weight per unit volume of the bottle of 0.03 g / ml to 0.015 g.
An ultra-thin bottle made of synthetic resin / ml and capable of attaching a pump to the mouth, the pump comprising a piston, a cylinder, and a suction pipe hanging down from the lower end of the cylinder. A configuration is adopted in which the buckling strength of the bottle is reinforced by bringing the lower end of the suction pipe into contact with the inner surface of the bottom wall of the bottle.

Further, as an embodiment in which a pump can be attached to the mouth of the bottle, in addition to the above-described structure, the mouth of the bottle has an upper mouth cylinder having a screw threaded on the outer periphery thereof, and a lower portion thereof. And a lower ring having a fixed height extending from the grip ring to a shoulder portion.

[0010] The certain height of the lower mouthpiece portion here is a height at which a finger can be inserted between the grip ring and the shoulder portion to hold only the mouth portion of the bottle. In the present specification, the resin weight per unit volume of the bottle is 0.03 g / ml to 0.1 g / ml.
A bottle molded with 015 g / ml synthetic resin and having a wall thickness of 0.4 mm or less is referred to as an ultra-thin bottle in order to distinguish it from a conventional thin bottle.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, A is a thin flat blow bottle formed by direct blow, B is a pump attached to the mouth of the blow bottle A and is replaceable, and C is a cap for mounting the pump.

As shown in FIGS. 1 to 3, the bottle A comprises a mouth 1, a shoulder 2, a body 3, and a bottom 4, and PE, PP, or other synthetic resin is used as a base resin. And are blow molded as a single layer or a laminate.

The mouth 1 comprises an upper mouth portion 5, a grip ring 6 located at an intermediate portion of the mouth portion 1, and a lower mouth portion 7 following the shoulder 2 from below. A screw 8 is provided on an outer peripheral surface of the upper mouthpiece portion 5, and an outer peripheral surface of the grip ring 6 protrudes from the upper mouthpiece portion 5 and the lower mouthpiece portion 7 of the mouth portion 1, and a part of the outer circumference surface Alternatively, a knurl 9 is engraved over the entire circumference. The lower mouth 7 is a bottle A
And has a height enough to grip the shoulder portion 2.

Although the mouth 1 is thicker than the body 3, it is still thinner than the conventional one, so it projects outward at the middle of the mouth 1. The mouth 1 is strengthened by forming a gripping ring 6 so that the bottle A can be gripped, and a knurl 9 is provided on the outer peripheral surface thereof. The bottle does not rotate.

A step 10 is formed between the shoulder 2 and the body 3, and as shown in FIGS. 3 and 4, the cross section of the shoulder 2 and the body 3 has an elliptical front and rear surface, and both sides are flat. Flat section 11
It has become. The torso portion 3 includes front and rear wall surfaces 12 and left and right side wall surfaces 13. The side wall surface 13 is a vertical plane that cuts an elliptical surface of the front and rear wall surfaces 12, and its upper end extends to the shoulder portion 2. The edge and the end of the front and rear wall surface 12 are connected by a narrow arc-shaped wall 14.

The front and rear wall surfaces 12 of the body 3 are provided with grooves 15 extending in the horizontal direction at equal intervals in the vertical direction. Has become. The left and right side walls 13 intersect with the arc-shaped wall 14 at a fixed angle, and a plurality of circular reinforcing recesses 16 are arranged on the surface of the side wall 13 at regular intervals in the vertical direction. A bulging peripheral wall 17 having a step between itself and the upper part is disposed at the lower end of the body 3 and continues to the bottom 4.

As shown in FIGS. 1, 2, and 4, the bottom 4 is composed of a bottom peripheral wall 18 and a bottom wall 19.
The front and rear walls 20 are slightly inclined and the left and right side walls 21 are inclined at a predetermined angle. The connecting portion between the bottom peripheral wall 18 and the bulging peripheral wall 17 of the body 3 has an upper horizontal rib
2 are provided, and a plurality of vertical ribs 23 are provided on the front and rear walls 20 at regular intervals.

At the lower end of the bottom peripheral wall 18, a lower horizontal rib 24 is disposed over the entire circumference. Below the lower horizontal rib 24, a ground end wall 19a of the bottom wall 19 is continuous. The bottom wall 19
It is formed as an upwardly concave curved surface 25, the center of which is flat. In addition, if necessary, the lower end of the pipe described later is surrounded to prevent the lower end of the pipe from shifting.
, A circular recess 2 having a flat bottom wall 26 in the center,
7, or a plurality of projections may be formed on the upper surface of the bottom wall 19 so as to surround the outer periphery of the lower end of the pipe (not shown).

The bottom peripheral wall 18 is reinforced by upper and lower horizontal ribs 22, 24 and vertical ribs 23, and the left and right side walls 21 are inclined so that the connection between the lower end of the bottom peripheral wall 18 and the bottom wall 19 is thick. The bottom part 4 is strengthened against the drop impact and buckling of the bottle A.

Next, the molding method will be described. The bottle of the present invention is molded by conventionally known direct blow molding. As a thin-walled bottle that maintains shape retention and can be easily crushed, the conventional one is 0.067 g /
Although the resin weight of ml was used, in the present invention, the resin weight per unit capacity was reduced by arranging reinforcing portions on the body wall surface and the bottom peripheral wall, and the resin weight was reduced to 0.05 to
It is 0.015 g / ml.

In order to make the ultra-thin bottle even lighter and easier to crush, the resin weight per unit capacity is set to 0.03 g / ml or less and the wall thickness of the body peripheral wall is set to 0.4 mm or less. . In one embodiment, the resin weight is 0.027 g / ml, the thickness of the side wall surface 13 of the body 3 is 0.1 to 0.15 mm,
Is 0.15 to 0.3 mm.

Next, the pump B and the cap C will be described. The pump B has a well-known structure, and will be briefly described. As shown in FIG. 5, the pump B has a built-in piston member and a cylinder 3 mounted on the mounting member 30.
1, a stem 32 having the piston member attached to the lower end thereof
And a nozzle head 33 having a nozzle attached to the upper end of the stem 32, and a suction pipe 34 attached to the cylinder 31.

The suction pipe 34 is made of PE or another synthetic resin. The lower end 35 has a plurality of cutouts at its lower end 35 as shown in FIGS. The diameter and thickness of the suction pipe 34 can be appropriately set according to the required buckling strength.

The cap C is attached to the mounting member 30 together with the cylinder 31 and is screwed to the bottle mouth 1 to seal the inside of the bottle via packing.

Cap C is screwed on and pump B is bottle A
When attached to the suction pipe 34, its lower end 35
Is in contact with the inner surface of the central portion of the bottom wall 19 of the bottle A, or has a length such that it does not separate more than a predetermined distance even if there is a gap. When the concave portion 27 is provided at the center portion or when a plurality of protrusions surrounding the lower end of the suction pipe are provided, the lower end 35 of the pipe is inserted and held in the concave portion 27 or the protrusion. .

Next, the operation and effect based on the above configuration will be described. The thin-walled bottle of the present invention is put on the market both as a liquid dispensing container with a pump attached and a refillable container filled with a content liquid and covered with a temporary cap. When using the liquid contents as a liquid dispensing container, remove the pump of the liquid dispensing container and the cap of the refill container, attach the pump to the mouth of the thin bottle of the refill container, and use the used liquid Discharge the container by hand and discard it.

At this time, a gripping ring 6 is formed in the middle of the bottle mouth 1 and the diameter of the lower mouth 7 is increased so that it can be held by a finger. The pump B can be stably held and replacement of the pump B can be easily performed.

The front and rear wall surfaces 12 of the body 3 are waved up and down to form a corrugated wall surface, the side wall surface 13 is a vertical surface, and the bottom 4 is provided with ribs, so that the rigidity and seat of the whole bottle can be reduced. When the pump B is attached, the lower end 35 of the suction pipe 34 is attached to the bottom wall 19.
In this case, the suction pipe 34 plays a role as a reinforcing material, and the buckling strength as a bottle is increased.

Next, the gap between the lower end 35 of the suction pipe 34 and the bottom wall 19 of the bottle A will be described. The suction pipe 34 is formed using PE resin or the like as a material as described above, and has a necessary buckling strength by selecting the diameter and thickness of the pipe. When the lower end 35 of the suction pipe 34 is in contact with the bottom wall 19, the buckling strength of the bottle itself is maintained by the suction pipe.

However, the bottom wall 19 and the suction pipe 34
When the pump is mounted, the gap between the lower end 35 of the pump and the bottles may vary due to variations in the dimensions of the bottles during blow molding, variations in the dimensions when forming the pump members, and variations in the dimensions when the pump is assembled. The gaps do not always match or become zero.

Even if there is a small gap, when the bottle is slightly deformed during the pressing operation of the pump, the suction pipe 3
The lower end 35 of the tube 4 comes into contact with the bottom wall 19, and the suction pipe 34 serves as a reinforcing member against buckling and acts to maintain the bottle in a constant state. However, when the gap becomes large, the buckling strength mainly depends on the bottle.Because it is an ultra-thin bottle, the buckling strength is weak, and when a certain pressing force is applied between the top and bottom of the bottle, the body of the bottle, Buckling occurs at the bottom.

The limit of the gap at which the buckling strength of the bottle is maintained by the suction pipe 34 depends on the resin weight per unit volume and the wall thickness of the bottle, and is preferably within 5 mm. 5mm-10
It has been confirmed through experiments that the suction pipe functions as a reinforcing member even with a gap of mm.

In the above-described embodiment, a plurality of cuts are formed at the lower end of the suction pipe 34 to form the suction port 36. However, a vertical slit in which the suction ports are arranged at equal intervals around the cylinder, or It may be an opening.

In the above embodiment, the flat bottle has been described. However, the bottle may be a circular bottle whose shoulder, trunk, and bottom are circular in cross section.

[0035]

Since the present invention is configured as described above, it has the following effects. The buckling strength of the bottle is reinforced by bringing the lower end of the suction pipe of the pump into contact with the bottom wall surface of the bottle, so that even ultrathin bottles can be used by replacing the pump.

Since the lower mouth tube portion having a fixed height is provided at the mouth portion so that the bottle can be held by grasping only the mouth portion of the bottle, the pump can be attached, removed, and replaced easily. It has become.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of a blow bottle to which a pump of the present invention is attached.

FIG. 2 is a side view of the bottle.

FIG. 3 is a plan view of the bottle.

FIG. 4 is a cross-sectional view showing a modified example of the bottle bottom.

FIG. 5 is an explanatory diagram of a pump and a cap.

[Explanation of symbols]

 Reference Signs List A blow bottle B pump C cap 1 mouth 2 shoulder 3 trunk 4 bottom 19 bottom wall 19a grounding end wall 26 flat bottom wall 27 concave portion 30 mounting member 31 cylinder 32 stem 33 nozzle head 34 suction pipe 35 lower end 36 suction port

Continuing from the front page (72) Inventor Masafumi Yoneyama 310, Mindodai, Matsudo-shi, Chiba Matsuno Plant, Yoshino Industry Co., Ltd. (72) Inventor Hiroaki Tokuda 3-2-6 Oshima, Koto-ku, Tokyo F. Yoshino Industry Co., Ltd. F Terms (reference) 3E084 AA04 AA12 AA24 AB01 DA01 FB01 GA01 GB01 GB12 LB02 LC01 LC06 LD22

Claims (2)

[Claims] 1. The method according to claim 1, wherein the weight of the resin per unit volume of the bottle is 0.1.
An ultra-thin bottle molded with a synthetic resin of from 03 g / ml to 0.015 g / ml and having a pump attached to a mouth thereof, the pump comprising a piston, a cylinder, and a suction pipe hanging down from a lower end of the cylinder. A thin-walled blow bottle comprising a pump, wherein a lower end of a suction pipe of the pump is brought into contact with an inner surface of a bottom wall of the bottle to reinforce buckling strength of the bottle. 2. A bottle mouth portion, an upper mouth portion having a screw threaded on the outer periphery, a holding ring projecting below the upper mouth portion, a knurl on the outer periphery, and a fixed portion extending from the holding ring to the shoulder. The thin blow bottle according to claim 1, comprising a lower mouth portion having a height.