Máy nito bảo quản thực phẩm loại nhỏ STN
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Covering of foodstuffs with nitrogen is a good method for preserving foodstuffs，which can be preserved from 90 decade to the next centu ry by using this method Custome rs appeal for foodstuffs in high—quality package and fresh f ruit p roducts，but the ha rmfulness of chemical preservatives give a warning to the custome rs。proclivity In this age of continuous improvement of environmental awareness， every one hopes to benefit from natural and un reactive nitrogen Nitrogen is a basically envi ronmental matter，and is a kind of gas with inactively chemical propeRy as well as without any color and taste，and occupies 79％of wholly eadh。s~mosphere If gaseous nitrogen is used for preserving foodstuffs，it will not remain any chemical residues．
Foodstuff package：
Nitrogen used for food stuff industry is to p rotect compounds that are subject to be damaged by oxygen and moistu re in atmosphere Using nitrogen to be instead of oxygen and moistu re in food packages will decrease foods。corrosion and quality Josses brought in ai r． The negative effects of atmosphere include increases of number of moulds and bacteria，oxidization，discoloration as well as corrosion Thus decrease of the air in a food package may prolong the quality and freshness of the packaged foodstuff， which WiII be beneficiaI for both detaile rs and customers Adoption of decrease of ai r in a foodstuff package other than use of chemical preservatives has been proved an anothe r method for prolonging foodstuff。S life Oxygen may be almost applied for packages for all kinds of fast foodstuffs，including fried potato chip，biltong，fresh fruit slicing，vegetable，nut，biscuit and tartlet Applying very dry nitrogen in a foodstuff package is to solve a p roblem of moistu re，and decrease of oxygen content can decrease the degrees of oxidation and discoloration of the foodstuff For example，when odoriferous oils and perfume mate rials scenting of a smell of coffee are exposed to ai r，they will be subject to damage If they are cove red by nitrogen the quality 0f the coffees will be p rotected and has no loss in respect Of basic characteristics as a beverage People who bake coffee，especially those gou rmets and persons for coffee flavou r treating， are accepting the method of applying nitrogen to package and transpo rt coffee powders and the like of baked beans Edible oils and non-ca rbonate beve rages may also benefit frOm nitrogen．In some bottles or containers．there are “head spaces” between liquid and lids where air is replaced by nitrogen，thus the life of liquid can be prolonged by 500％.
Beverage agitation：
Oxygen dissolved in liquid and oils may result in thei r sedimentations，the oxygen in these liquids may make thei r tastes become bad and shorten thei r life Applying a kind of method known as”agitation” which is to inlet gaseous nitrogen into liquid during p rocessing procedu re，these nitrogen bubbles are able to remove oxygen to protect against oxidation，corrosion and discoloration of non—carbonate beverages(fruit)uice，tea and milk)and edible oils(peanut，olive，sunflower seed and rape—seed oils)．
Nitrogen swelling:
Foods with other kinds need to be added by air to enlarge thei r volumes Apply nitrogen to。”puff”edible oil，mayonnaise margarine in bulk or peanut oil products can enlarge thei r volumes and expansion fo rce SO that thei r life can be prolonged.
