JPS6313171Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a thin-walled container made of synthetic resin.

``Problems that conventional technology and ideas are trying to solve'' Recently, synthetic resin bottles have been widely used. This bottle has the advantage of being easier to measure and less likely to break than a glass bottle. By making the synthetic resin bottle thinner, the material can be saved. For example, a biaxially stretched saturated polyester resin bottle can have its mechanical strength increased by biaxially stretching. However, when such thin-walled synthetic resin bottles are filled with heat-sterilized liquid and then capped and sealed, the volume decreases due to cooling of the filled liquid, and air above the liquid level inside the bottle, the so-called head. There was a drawback that the inside of the bottle became negative pressure due to the volume reduction due to the temperature drop of the air in the space, and the bottle wall was curved inward due to the negative pressure. Note that this decompression deformation occurs not only when high-temperature liquid is filled, but also when oxygen in the head space is absorbed by the filling liquid. Examples of such liquids include edible oil.

In order to prevent deformation of synthetic resin bottles under reduced pressure, a deformation-permissible portion is provided in advance on the bottle wall, and only the deformation-permissible portion is deformed into a concave shape so that the appearance of the bottle is not damaged. However, this method imposes significant restrictions on the design of the bottle.
In addition, the location for pasting the label is also restricted, and furthermore, the bottle wall cannot be sufficiently thinned.

However, the above-mentioned prevention of deformation due to reduced pressure can be solved by filling the head space of the bottle with high-pressure air or the like in advance in anticipation of the reduced pressure. This proposal concerns a cap that can be filled with high-pressure gas.

"Means for Solving the Problems" The present invention includes a thin-walled synthetic resin bottle 1 in which an engaging protrusion 11 is provided around the outer periphery of the mouth and neck part 10, and a top wall 20 to be attached to the outside of the mouth and neck part 10.
An outer circumferential wall 24 is provided vertically from the peripheral edge of the engagement protrusion 2 that engages with the engagement protrusion 11 on the inner edge of the outer circumferential wall.
5 is provided around the top wall 20, and a vertical ventilation groove 26 is formed at a proper position of the engagement protrusion, and an inner cylinder is formed at a proper position on the top wall 20 so as to fit into the inside of the neck part 10 in an airtight and watertight manner. A cap 2 made of synthetic resin is formed such that the inside and outside of the bottle can be ventilated during temporary attachment by vertically disposing the bottle 27 and forming vertical ventilation grooves 28 at appropriate positions on the lower part of the outer peripheral surface of the inner cylinder 27.

"Function" With the above configuration, the inner cylinder 27 of the cap 2 is inserted into the neck part 10 of the thin-walled bottle 1 filled with heated liquid.
When the cap is inserted, the lower surface of the engagement protrusion 25 on the outer peripheral wall 24 of the cap abuts against the upper surface of the engagement protrusion 11 on the neck portion 10, resulting in a predetermined shallow temporary fit state.

If it is placed in an atmosphere of high pressure gas such as air or nitrogen in this state, the high pressure gas will flow into the head space in the thin bottle through the ventilation grooves 26 and the ventilation vertical grooves 26.

Therefore, if the cap 2 is strongly pressed down in that atmosphere, the inner cylinder 27 will fit into the neck part 10 in an airtight and watertight manner, and the engaging protrusion 25 on the outer peripheral wall 24 will fit into the engaging protrusion on the neck part 10. 11 and is held.

"Example" The drawings show an embodiment of the invention.

In the figure, reference numeral 1 denotes a thin-walled bottle made of biaxially stretched saturated polyester resin, which has an engaging protrusion 11 around the outer periphery of the mouth and neck part 10, and a flange 12 below the engaging protrusion. is established.

Reference numeral 2 denotes an open/pour-out type cap made of a suitable synthetic resin, and the cap has a thin break line 21 that goes around the center of the top wall 20, and the interior surrounded by this is a break opening 22. and a finger ring 23 is provided to protrude upward from the top surface of the broken opening,
An outer circumferential wall 24 is provided vertically downward from the peripheral edge of the top wall 20 to fit and engage with the outside of the bottle neck 10,
Inside the outer circumferential wall, an inner cylinder 27 that fits into the inside of the bottle neck 10 is vertically disposed downward from a proper position on the lower surface of the top wall 20, and the thin fracture line 21 on the upper surface of the top wall 20 is provided.
A spouting tube 29 whose upper end expands upward from the outside and has a thread on its outer periphery is provided.

The outer circumferential wall 24 has an engaging protrusion 25 on its inner circumferential surface that engages with the engaging protrusion 11 of the bottle neck 10, and a vertical ventilation groove 26 is formed by cutting out a suitable part of the engaging protrusion. is formed.

The inner cylinder 27 has an outer circumferential surface having an outer diameter that fits airtightly and watertightly into the inner surface of the bottle neck 10, and a vertical ventilation groove 28 is formed at a suitable position in the lower part of the outer circumferential surface.

Reference numeral 3 denotes an outer cap made of synthetic resin that is detachably screwed onto the spouting tube 29, and the peripheral wall 3 is provided with a thread that is screwed onto the spouting tube 29 downward from the peripheral edge of the top wall 30.
1 is installed vertically.

Then, the cap 2 is temporarily fitted to the neck part 10 of the bottle 1 filled with heated liquid, with the vertical ventilation groove 28 opening to the inside and outside of the bottle, and the bottle 1 is placed in an atmosphere of high-pressure gas such as air or nitrogen. High pressure gas is supplied to the head space within the bottle 1 by passing through the vent flute 28 of the cap. In addition, at that time, the inner cylinder 27
The fit of the lower part into the neck of the bottle prevents the cap from coming off.

Thereafter, in the high-pressure gas atmosphere, the cap 2 is pushed down to fully fit into the bottle neck 10 in an airtight and watertight manner, and the engagement protrusion 25 of the cap 2 is inserted into the engagement protrusion 11 of the bottle neck 10. to engage.

When dispensing the liquid inside the bottle, remove the outer cap 3, put your finger on the finger ring 23, and pull strongly upwards to break the thin break line 21 and open the break opening 2.
2 is removed, and the liquid is poured out from the opened mouth.

"Effect of the invention" According to the present invention, the cap 2 can be easily temporarily attached by fitting the inner cylinder 27 to the neck part 10 of the thin-walled bottle 1 containing heated liquid. Since the lower surface of the strip 25 can be brought into contact with the upper surface of the engaging protrusion 11 on the mouth and neck, a predetermined tacking position can always be secured, a predetermined stable tacking can be obtained, and a high-pressure gas atmosphere can be obtained. It does not lack stability even when sent inside.

Therefore, when temporarily attached in this way and placed in an atmosphere of high-pressure gas such as air or nitrogen, the high-pressure gas flows into the head space inside the thin-walled bottle through the ventilation groove 26 and the vertical ventilation groove 28, and then If the cap 2 is pushed down sufficiently in this atmosphere to make a deep and tight fit, the high-pressure gas can be sealed, and the high-pressure gas can be filled very easily and smoothly. 25 and the engagement protrusion 11 of the mouth and neck part 10, it can be strongly held. In this way, by sealing in high-pressure gas when filling heated liquid, it is possible to prevent the internal pressure from dropping below atmospheric pressure due to cooling shrinkage, etc., even if the bottle is a thin-walled synthetic resin bottle. , it is possible to prevent the deformation of the bottle due to negative pressure, and it is possible to eliminate problems such as a decrease in stability due to deformation, deterioration of the appearance, variations in the top and bottom of the liquid level, restrictions on the design of the bottle, and restrictions on the place where the label is pasted. Walls can be made sufficiently thin.

Furthermore, there is no need to make the neck of the bottle into a special shape, and the cap is simple in construction and can be provided at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cut-away side view of the product as it is attached to a bottle, and FIG. 2 is a cut-away side view of the product as it is temporarily attached to the bottle. 2...cap, 3...outer cap, 25...
Engagement protrusion, 26... Ventilation groove, 27... Inner cylinder, 28
...Ventilation vertical groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A thin-walled synthetic resin bottle 1 having an engaging protrusion 11 around the outer periphery of the neck part 10, and a top wall 20 to be attached to the outside of the neck part 10.
An outer circumferential wall 24 is provided vertically from the peripheral edge of the engagement protrusion 2 that engages with the engagement protrusion 11 on the inner edge of the outer circumferential wall.
At the same time, a vertical ventilation groove 26 is formed at a proper position of the engagement protrusion, and the mouth and neck part 1
In order to fit the inside of the bottle in an airtight and watertight manner, an inner cylinder 27 is installed vertically from a suitable position on the top wall 20, and a vertical ventilation groove 28 is formed at a suitable position on the lower part of the outer peripheral surface of the inner cylinder 27. A thin synthetic resin container comprising: a synthetic resin cap 2 formed to allow ventilation;