Studies Of Filming Technology On Edible Packaging Films

Edible packaging film is defined as membrane,which is formed by interacting between different molecules and come from natural and edible materials such as polysaccharide,protein,etc.,adding plasticizers and crosslinking agents. Edible packaging film can be eaten together with food packaged with it. So it can't bring about environment pollution. In recent years, edible packaging film was studied thoroughly by many researchers at home and abroad and gained some positive results. But there aren't system reports at home and abroad about the studies on manufacture technology of edible packaging film. With the main materials of filming like cross-linking starch.soy protein isolated and sodium alginate,the technology and referance data of laboratory and industrialized manufacture on edible packaging film was studied in this article,and two kinds of films made in laboratory and in industry were compared.The main results indicated:1 Through repeated experiments,the best technology and referance data of laboratory manufacture on polysaccharide edible packaging film was confirmed.Take cross-linking starch film for example.its best technology and referance data are:dissolving cross-linking starch in water,heating it,meanwhile stirring in the frame way with the speed of 180r/min,degassing 15 minutes under the vacuum of 0.095MPa,scraping to film on the chrome-plating-steel board,then drying it 6 hours under the constant temperature of 50℃,drenching with water evenly,taking off the film and keeping in reserve.2 Through repeated experiments,the best technology and referance data of laboratory manufacture on protein edible packaging film was confirmed. Take soy protein isolated film for example.its best technology and referance data are:dissolving soy protein isolated in water,heating it,meanwhile stirring in the oar way with the speed of 180r/min,antifoaming the film liquid by adding 0.06% edible antifoaming agent,scraping to film on the staingless steel board coated with 0.05mL/100cm tween80, drying it 2 hours under the hot wind of 60℃, drenching with water evenly.taking off the film and keeping in reserve,3 Through repeated experiments,the best technology and referance data of laboratory manufacture on compound edible packaging film was confirmed. Take compound sodium alginate film for example,its best technology and referance data are: dissolving sodium alginate and gelatin in water with the percentage 1.5% : 1.5%,heating them, meanwhile stirring in the frame way with the speed of 180r/min, degassing 25 minutes under the vacuum of 0.095MPa,scraping to film on the staingless steel board, drying it 6.5 hours under the hot wind of 45℃, drenching with water evenly,taking off the film and keeping in reserve.4 Through repeated experiments.the best technology and referance data of industrialized manufacture on polysaccharide edible packaging film was confirmed.Take cross-linking starch film for examplejts best technology and referance data are:dissolving cross-linking starch in water in double layer pot,heating it,meanwhile stirring with the speed of 40r/min,scraping to film on the red copper belt and its speed is lr/min,then ventilating water vapor to heat in dryer,with the water vapor pressure of 0.20MPa(surface pressure),rolling up the film packaging it and keeping in reserve.This technology has been tested successfully and can be applied in expanding production.5 Through repeated experiments,the best technology and referance data of industrialized manufacture on protein edible packaging film was confirmed.Take soy protein isolated film for example.its best technology and referance data are:dissolving soy protein isolated in water in double layer pot,heating it,meanwhile stirring with the speed of 30r/min,scraping to film on the red copper belt and its speed is 1.5r/min,then ventilating water vapor to heat in dryer,with the water vapor pressure of 0.25MPa(surface pressure),rolling up the film packaging it and keeping in reserve.This technology has been tested s...