Continuous modified atmosphere fresh-keeping packaging machine and packaging method thereof

Abstract

The invention discloses a continuous modified atmosphere fresh-keeping packaging machine and a packaging method thereof. The packaging machine comprises a conveying mechanism, an atmosphere modification mechanism and a sealing and cutting mechanism which are arranged on a rack; at least four stations are arranged on a containing opening conveying belt and synchronously conduct feeding, atmospheremodification, sealing and cutting and discharging procedures respectively; packaging containers are placed in the containing opening stations, and a containing opening bearing mechanism is borne at the lower ends of the containing opening packaging containers. The containing opening atmosphere modification mechanism comprises an atmosphere modification chamber main body; the containing opening atmosphere modification chamber main body and the conveying face of the containing opening conveying belt are elastically sealed, a dynamic sealing space is formed above the conveying belt, the atmosphere modification chamber main body is connected with an inflation mechanism, the inflation mechanism sprays nitrogen to the containing opening packaging containers, an exhaust channel is formed in the atmosphere modification chamber main body, and an oxygen sensor for monitoring the oxygen concentration is installed on the inner wall of the containing opening exhaust channel. The dynamic sealing space can effectively prevent space gaps caused by station transfer from influencing air tightness, and the oxygen sensor monitors the oxygen content in exhausted gas to prevent a large amount of oxygenfrom remaining in the packaging container.

Description

technical field [0001] The invention relates to the field of modified atmosphere packaging, in particular to a continuous modified atmosphere fresh-keeping packaging machine and a packaging method thereof. Background technique [0002] Modified atmosphere fresh-keeping packaging uses packaging materials with gas barrier properties to package food. According to actual needs, a certain proportion of O 2 +CO 2 +N 2 , N 2 +CO 2 , O 2 +CO 2 The mixed gas is filled into the packaging to prevent or slow down the decline in the quality of food in terms of physics, chemistry, biology, etc., thereby prolonging the shelf life of food and increasing the value of food. [0003] However, in the current modified atmosphere packaging technology, the process of air conditioning and heat sealing and film cutting is completed by the upper mold and the lower mold. The upper mold is equipped with a sealing and cutting mechanism, and the lower mold is equipped with a ventilation mechanism. ...

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Problems solved by technology

[0003] However, in the current modified atmosphere packaging technology, the process of air conditioning and heat sealing and film cutting is completed by the upper mold and the lower mold. The upper mold is equipped with a sealing and cutting mechanism, and the lower mold is equipped with a ventilation mechanism. , the upper mold and the lower mold are closed, and the packaging film is covered between the lower mold and the upper mold to form a sealed space, and then the air is ventilated through the ventilation mechanism before sealing; this process has the following disadvantages: (1) the packaging device enters After the mold is lowered, it is necessary to complete the gas adjustment before heat sealing can be carried out. The gas adjustment and heat sealing and film cutting cannot be carried out at the same time, and the efficiency of the modified atmosphere packaging is low; (2) the mixed gas ratio cannot be accurately known during the gas adjustment process. High residual oxygen content will directly affect the freshness effect of modified atmosphere packaging

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