JPS58216584A - Method of capping vessel made of plastic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capping method for filling a plastic container with liquid at high temperatures.

Synthetic resin bottle-shaped containers (plastic bottles) are now often used in place of traditional glass bottles, but when filling various liquids to make bottled products,
Normally, like glass pins, the bottle is passed from a bottle alignment machine to a filling machine, and then capped and sealed using a capping method or a screw type K in a capping device.

In this case, there is no problem if the filling is done at room temperature or lower, but if the filling temperature is high enough to reach or exceed the temperature at which the plastic material of the bottle deforms, capping may occur. The force that sometimes acts on containers can cause deformation or collapse of the mouth of the container, which can lead to poor sealing of the stopper or cap and cause the contents to leak.

The present invention provides a capping method that improves these conventional drawbacks and ensures reliable sealing when filling a plastic container with liquid or the like at high temperatures.

That is, in the present invention, after filling a plastic container with contents and before capping the container, a refrigerant gas pipe is blown onto the mouth of the container to rapidly bring the portion below the deformation temperature from the outer surface of the container. Capping is performed after cooling.
The tortoise is hardened to ensure a secure seal without deforming or crushing.

In the present invention, the refrigerant gas includes, for example, liquefied N, glass liquefied ω, and low-temperature inert gases such as gases, but if the temperature of the filling field is not so high, compressed air at room temperature is also effective. The refrigerant gas may be sprayed by positioning the nozzle port near the mouth of the filled bottle on the turntable.

This turntable is usually placed on the filling line between the filling machine and the capping device. After the mouth is rapidly cooled below the deformation temperature in this way.

Since capping is performed by the usual capping method or seaming method, even if force is applied during capping, the mouth part is cooled below the deformation temperature, so there is no deformation or crushing, and the correct shape is maintained. Capping can be done in a sealed state. After capping, even if the mouth part reaches the deformation temperature again due to the temperature of the contents, the sealing performance is not affected and the sealed state is maintained, so there is no risk of leakage of the contents.

Examples are shown below to clearly demonstrate the effects of the present invention.

Example: Fill a polyethylene terephthalate bottle with warm water at a specified temperature (described later) to below the bottle neckline, and immerse the hot water bottle in a hot water tank set to the above hot water temperature for about 10 minutes (at this time, the hot water inside and outside the bottle Approximately the same surface
After that, take it out and place it on a turntable rotating at 60 rpm, place the tip of the refrigerant nozzle (5 ms) at a position 20 wI+ from the outer surface of the mouth, and spray refrigerant for a predetermined period of time (set pressure 0.8 Kf). /a/+2),
After the L car, I capped it.

Temperature of hot water tank and high temperature filling (℃): 65.70.75, button, 85.90° Refrigerant spraying time (seconds): 1.2.4.6.8 Type of refrigerant: CO, liquid gas, Nt liquid gas, air, and other conditions: 1) It was pulled out of the hot water tank, placed on a turntable, and the refrigerant spraying was started for 15 seconds.

2) After the refrigerant spraying was finished, it took 8 seconds to start capping.

However, in a comparative test (without refrigerant cooling), the time from opening the tank to capping was set at 23 seconds.

Portion outer diameter: 28.7 m Cap: Aluminum PP cap Capping machine: Shibasaki Seisakusho ÷ 501 Machine The deformation of the opening during capping was examined under the following conditions and the results are shown in the table.

The evaluation criteria in the table are as follows.

○... No problems at all, no difference from room temperature △... Slight deformation, but no problem with sealing performance ×...
- If normal capping is not possible and sealing performance is poor (n = 10), if even 1 out of 10 bottles is defective, it will be evaluated as Δ or ×.As described above, according to the capping method of the present invention, 1 synthetic resin container is used. When filling with liquid at high temperatures, the capping tube can be reliably sealed without causing deformation of the opening, which is extremely effective.

Patent applicant: Mitsubishi Plastics Co., Ltd. Representative Patent Attorney Yoshio Kimura

Claims (1)

[Claims] After filling a glass container with a highly wet liquid, spray refrigerant gas onto the mouth of the container to rapidly cool the outer surface of the mouth below the deformation temperature, and then close the container by corking or crimping. Capping method for plastic containers as a percentage