JPH0680119A - Filling method for nitrogen gas - Google Patents

Abstract

PURPOSE:To appropriately fill gas or liquid gas at the normal temperature although since it is difficult to fill by a proper volume or replace suitably the inside air, the residual air is apt to be excess or the vessel is sometimes broken due to overcharging. CONSTITUTION:The supercooled gas having a larger specific gravity in a liquid gas vessel 1 is directly ejected into a food container 3 through a vacuum heat- insulated double tube 2.

Description

【発明の詳細な説明】 〔産業上の利用分野〕この発明は缶詰缶の巻締め又は紙
製パック封止直前に缶又はパック内に窒素ガスを吹込み
缶又はパック内のガスを窒素ガスで置換すると共に内部
の圧力を陽圧に保つ方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention blows nitrogen gas into a can or pack immediately before winding the canned can or sealing the paper pack, and the gas in the can or pack is changed to nitrogen gas. The present invention relates to a method of replacing and maintaining the internal pressure at a positive pressure.

〔従来の技術〕常温の窒素ガスを吹付け窒素ガス雰囲気
中にて封をするものと、液体窒素の適量を滴下して封を
する方法があった。[Prior Art] There are a method of blowing nitrogen gas at room temperature for sealing in a nitrogen gas atmosphere and a method of dropping an appropriate amount of liquid nitrogen for sealing.

〔発明が解決しようとする課題〕従来の液化ガスを滴下
する方法においては其の適量滴下か仲々困難であり、従
って封をした容器内の圧力を一定に保つ事が出来難く、
又食品容器真上に液化ガスの溜りが必要で作業の邪魔に
なった。紙パックにおいて常温のガスを吹込む方法で
は、パック内部のガスと温度が近い為置換効率が悪く、
大量の窒素ガスを必要とした。この発明は上述した従来
例の欠点を除去する目的のもので、適量のガスを供給し
容器内部の既存のガスの置換を十分行うと同時に過度の
窒素ガスの消費を防止すものである。[Problems to be Solved by the Invention] In the conventional method of dripping a liquefied gas, it is difficult to drop an appropriate amount of the liquefied gas, and thus it is difficult to keep the pressure in the sealed container constant.
In addition, it was necessary to collect liquefied gas directly above the food container, which hindered the work. In the method of blowing a gas at room temperature into a paper pack, the gas inside the pack and the temperature are close to each other, so the replacement efficiency is poor,
It required a large amount of nitrogen gas. The present invention is intended to eliminate the above-mentioned drawbacks of the conventional example, and is to supply an appropriate amount of gas to sufficiently replace the existing gas inside the container and at the same time prevent excessive consumption of nitrogen gas.

〔課題を解決するための手段〕深冷ガス発生機構と、こ
れに連設した電磁弁を有する真空断熱二重管及び前記電
磁弁を開閉する為のタイマーとで構成されるもので、低
温液化ガス容器内の気相の部分に、電磁弁を有する真空
断熱二重管の一端を挿入すると共に、液化ガス容器内部
の液体窒素を熱源により加熱蒸発せしめ其の蒸発ガスの
圧力により液化ガス容器内部の深冷ガス管を経由して食
品容器の上部空間に軽く吹込むものである。[Means for Solving the Problems] A cryogenic gas generation mechanism, a vacuum adiabatic double pipe having a solenoid valve connected to it, and a timer for opening and closing the solenoid valve, Insert one end of a vacuum insulated double tube with a solenoid valve into the gas phase part of the gas container, and heat and evaporate the liquid nitrogen inside the liquefied gas container with a heat source. It blows lightly into the upper space of the food container via the cryogenic gas pipe.

〔作 用〕上記の方法によれば液化ガス容器中で発生
した深冷窒素ガスは真空断熱二重管を通ってくるので温
度の上昇は少なく、深冷ガスを食品容器空所に供給出来
るが、深冷窒素ガスは比重が重いので容易に食品容器内
の空気，水蒸気と置換を行い得ると共に吹込んだガスの
温度は比較的早く上昇し、余分に供給しても封をした後
の食品容器内の圧力が上昇し過ぎることはない。また窒
素ガスを供給する食品容器上部を窒素ガス雰囲気にしな
くともよいのでガスの消費は少なくてすむ。[Operation] According to the above method, the cryogenic nitrogen gas generated in the liquefied gas container passes through the vacuum adiabatic double pipe so that the temperature does not rise and the cryogenic gas can be supplied to the empty space of the food container. Since the cryogenic nitrogen gas has a high specific gravity, it can be easily replaced with air and water vapor in the food container, and the temperature of the blown gas rises relatively quickly, and even if it is additionally supplied, the food after sealing The pressure in the container does not rise too high. Further, since the upper part of the food container for supplying the nitrogen gas does not have to be in a nitrogen gas atmosphere, gas consumption can be small.

〔実施例〕第一図はこの発明の深冷窒素ガス添加装置の
一例を示すものである。液化ガス容器１の中の液体窒素
をヒーター７にて加熱蒸発せしめ、保圧弁５によって液
化ガス容器内部を一定の圧力に保つ。制御器８はタイマ
ーと電磁弁４の電源を内蔵し、外部信号とタイマーによ
り電磁弁４が開の間隔と時間を制御する。電磁弁４が開
になれば液化ガス容器中の気相の部分に発生した深冷さ
れたガスは真空断熱二重管２のガス吹出口６より食品容
器３の内上部に軽く吹き込まれる。[Embodiment] FIG. 1 shows an example of the cryogenic nitrogen gas addition apparatus of the present invention. The liquid nitrogen in the liquefied gas container 1 is heated and evaporated by the heater 7, and the inside of the liquefied gas container is kept at a constant pressure by the pressure holding valve 5. The controller 8 has a timer and a power source for the solenoid valve 4, and controls the opening interval and time of the solenoid valve 4 by an external signal and the timer. When the solenoid valve 4 is opened, the deeply cooled gas generated in the gas phase portion of the liquefied gas container is blown into the food container 3 from the gas outlet 6 of the vacuum heat insulating double pipe 2 lightly.

〔発明の効果〕以上説明したようにこの発明の深冷窒素
ガス添加法によれば、窒素ガスを適量宛食品容器に添加
することができる。深冷ガスは比重が重いので内部の既
存ガスとの置換率が高く、封をするときにもガス状であ
るため封入後高圧になり過ぎることもない。余分の散逸
ガスも少ないので経済的であると共に作業場所には管の
先端部だけが設置されるのみなので作業の邪魔になら
ず、狭い空所からも挿入することができ、その上全体の
装置が極めてコンパクトにできる。[Effects of the Invention] As described above, according to the deep-chilled nitrogen gas addition method of the present invention, it is possible to add an appropriate amount of nitrogen gas to the food container. Since the cryogenic gas has a high specific gravity, it has a high replacement rate with the existing gas inside, and since it is gaseous even when it is sealed, it does not become too high in pressure after sealing. It is economical because there is little extra diffused gas, and since only the tip of the pipe is installed in the work place, it does not disturb the work and it can be inserted even from a narrow space, and the whole device Can be extremely compact.

【図面の簡単な説明】[Brief description of drawings]

第１図は窒素ガスの充填器の縦断面図、第２図は真空断
熱二重管のガス吹出口の拡大縦断面図。 １…液化ガス容器 ２…真空断熱二重管 ３…食品容器 ４…電磁弁 ５…保圧弁 ６…真空断熱二重管のガス吹出口 ７…ヒーター ８…制御器FIG. 1 is a vertical cross-sectional view of a nitrogen gas filler, and FIG. 2 is an enlarged vertical cross-sectional view of a gas outlet of a vacuum heat insulating double pipe. 1 ... Liquefied gas container 2 ... Vacuum heat insulation double pipe 3 ... Food container 4 ... Solenoid valve 5 ... Pressure holding valve 6 ... Vacuum heat insulation double pipe gas outlet 7 ... Heater 8 ... Controller

Claims (1)

【特許請求の範囲】[Claims] 缶又は紙製パック等の食品容器の封止直前に窒素ガスを
添加封入する装置において、深冷窒素ガスを其の深冷ガ
ス発生機構に連設した真空断熱二重管を経由して前記食
品容器内に吹込み内部ガスと置換する方法。In a device for adding and sealing nitrogen gas immediately before sealing a food container such as a can or a paper pack, the above-mentioned food is fed via a vacuum heat insulation double pipe in which deep-cooling nitrogen gas is connected to the deep-cooling gas generation mechanism. A method of blowing gas into the container and replacing it with internal gas.