JP3062309B2 - Biaxially stretchable synthetic resin piece for forming inner bottle, method for forming inner / outer double bottle, and inner / outer double bottle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxially stretchable synthetic resin piece for forming an inner / outer double bottle, which can be used, for example, as a cream-like storage bottle with a pump. The present invention relates to a method for forming a heavy bottle and an inner / outer double bottle.

[0002]

2. Description of the Related Art As a bottle relatively close to the inner / outer double bottle according to the present invention, a bag mouth containing a cream is fixed to a cylinder hanging down from a pump attached to the bottle mouth into the bottle. There is known a device provided so that cream in a bag can be discharged by a pump operation.

[0003]

The above-mentioned conventional bottle has a disadvantage that a preformed bag must be inserted into the bottle.

According to the present invention, an inner / outer double bottle can be formed extremely easily. The first invention is to insert the inner bottle into an outer bottle and to stretch the inner wall of the outer bottle biaxially as a cavity. It is possible to propose a synthetic resin piece for forming an inner bottle, and a second invention is to propose a method of forming an inner and outer double bottle by biaxially stretching the piece. Further, a third invention proposes an inner / outer double bottle formed by the method of the invention.

[0005]

Means for Solving the Problems A biaxially stretchable synthetic resin piece 1 for forming an inner bottle having an outward flange 3 provided at the upper end of a tube portion 2 having a bottom and an opening at an upper end surface is provided. An appropriate number of air circulation grooves 4 were vertically provided on the outer peripheral surface of the flange.

After heating the pipe of the piece 1, the piece 1
By holding the upper end of the piece and inserting the tube 2 into the longer outer bottle 11 and biaxially stretching the tube 2 with the inner surface of the outer bottle as a cavity, the piece is connected to the inner bottle 15. None, the outer peripheral surface of the outward flange 3 at the upper end of the inner bottle is fitted to the inner surface of the upper end of the mouth and neck portion 12 of the outer bottle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a biaxially stretchable synthetic resin piece for forming an inner bottle. The piece is injection molded in advance,
An outward flange 3 is provided at the upper end of the tube portion 2 having a bottom and an opening at an upper end surface. An appropriate number of air circulation grooves 4 are vertically provided on the outer peripheral surface of the outward flange. In order to lengthen the outer peripheral surface of the outward flange, the short tube 5 may be erected from the outer periphery of the outward flange as shown in the figure.
An outward flange 6 is provided. When the short cylinder 5 and the second outward flange 6 are provided as in the illustrated example, the air flow groove 4 is formed continuously from the lower end of the outward flange 3 to the upper end of the second outward flange. The piece finally becomes the inner bottle 15 by biaxially stretching the tube portion 2 in the outer bottle 11 as described later. In this case, the upper end of the piece becomes the upper end of the inner bottle. The outward flange 3 has substantially the same diameter as the inner surface of the mouth and neck so that it can be fitted to the inner surface of the mouth and neck 12 of the outer bottle 11.

In order to make the above piece into the inner bottle 15, first, as shown in FIG. 3, the piece 1 is heated by the heater 21 or the like so that the piece temperature becomes about 150 ° C. to 165 ° C. The heating may be performed by sandwiching the outward flange 3 between the lower part of the compressed air pipe 23 in which the push rod 22 is inserted vertically and the holder 25 having the groove 24 on the lower surface.

After the above heating, as shown in FIG. 4, the tube portion 2 is pulled out of the heater 21 and the lower surface of the holder 25 is placed on the upper end surface of the mouth and neck portion 12, and the tube portion 2 is held by the holding frame 26. Insert into the fixed outer bottle 11. The outer bottle 11 stands up a mouth and neck 12 having a cap screw on the outer surface from the upper end of the body via the shoulder. In the illustrated example, the upper inner surface of the mouth-neck portion has a large-diameter portion at the upper end, a medium-diameter portion below the upper-diameter portion, and a small-diameter portion below the upper-diameter portion. The flange 3 and the short cylinder 5 and the second outward flange 6 can be fitted to the large inner diameter portion, respectively, but it is not necessary to form them so.

Pressing rod from the state where the tube 2 is inserted into the outer bottle 11
The inner bottle 15 is formed by depressing 22 and blowing compressed air from the compressed air pipe 23 into the pipe portion 2 and biaxially stretching as shown in FIG. As the tube portion 2 expands due to the biaxial stretching, the outer bottle
The air in 11 is discharged between the upper outer surface of the piece and the inner surface of the mouth and neck of the outer bottle and through the groove 24 on the lower surface of the holder.

After the inner bottle 15 is formed as described above, the push-down rod 22, the compressed air pipe 23, and the holder 25 are removed, and the outward flange 3 is driven into the inner surface of the mouth and neck portion 12 to be fitted therein. Heavy bottle 18
And If the thickness of the inner bottle body is reduced to about 0.035 mm, the inner bottle body has bag-like flexibility.

[0012]

According to the present invention, a piece as described in claim 1 is formed, and the piece is biaxially stretched in an outer bottle to form an inner bottle 15, and the upper end thereof is formed. The inner and outer double bottles can be obtained simply by fitting the outer peripheral surface of the outwardly facing flange 3 to the inner surface of the upper end of the mouth and neck portion 12 of the outer bottle.
As shown, since the piece may be inserted into the outer bottle and the inner surface of the outer bottle may be biaxially stretched as a cavity,
The inner / outer double bottle is easy to form, and the inner / outer double bottle formed as described in claim 3 passes between the inner and outer bottles through the air flow groove 4 formed on the outer peripheral surface of the outward flange 3. Since the outside air can flow in, for example, the cream or the like is filled into the inner bottle 15, the cylinder of the pump attached to the bottle mouth is vertically installed in the inner bottle, and the cream or the like in the inner bottle is removed by the pump operation. When sucking and discharging, even if the cream-like material is discharged by shrinking the inner bottle body without replacing the outer air in the inner bottle, the outer air flows between the inner and outer bottles. Thus, deformation due to negative pressure of the outer bottle can be prevented. In addition, some medicines may be deformed due to negative pressure inside the bottle due to the absorption of enzymes in the air inside the bottle.In such a case, the contents should be filled in the inner bottle. Thus, deformation of the outer bottle can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a synthetic resin piece according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the piece.

FIG. 3 is a sectional view showing the above-mentioned piece heating state.

FIG. 4 is a sectional view showing a state in which the piece is set in an outer bottle.

FIG. 5 is a sectional view showing a biaxially stretched state of the piece.

FIG. 6 is a sectional view of an inner / outer double bottle.

[Explanation of symbols]

 1 piece 3 Outward flange 4 Air flow groove 11 Outer bottle 15 Inner bottle 18 Inner and outer double bottle 22 Push-down rod 23 Compressed air pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B65D 23/00-25/56 B65D 6/00-13/02 B65D 1 / 00-1/48 B29B 7/00-17/02

Claims (3)

(57) [Claims] 1. An inner bottle forming method, wherein an outward flange 3 is attached to the upper end of a tube portion 2 having a bottom and an opening at an upper end surface, and an appropriate number of air circulation grooves 4 are vertically provided on an outer peripheral surface of the flange. Biaxially stretchable synthetic resin piece for use. 2. After heating the tube portion of the piece 1 according to claim 1, the tube portion 2 is inserted into the outer bottle 11 longer than the piece 1 while holding the upper end of the piece, and The piece is formed into an inner bottle 15 by biaxially extending the tube portion 2 with the inner surface of the outer bottle as a cavity, and the outer peripheral surface of the outward flange 3 at the upper end of the inner bottle is moved to the inner surface of the upper end of the mouth and neck portion 12 of the outer bottle. A method for forming an inner / outer double bottle, which is performed by fitting. 3. An inner / outer double bottle formed by the molding method according to claim 2.