CN1296786A

CN1296786A - Microwave sterilizing equipment and method for bagged food containing water

Info

Publication number: CN1296786A
Application number: CN 99124040
Authority: CN
Inventors: 陈玉麟; 陈玉麒
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-22
Filing date: 1999-11-22
Publication date: 2001-05-30

Abstract

A method for sterilizing the bagged water-contained food features use of microwave energy, heat transfer, clean laminar flow and automatic sealing. Its equipment is composed of heating unit with microwave and hot air, temp measuring and control unit, microwave sterilizer under protection of clean laminar flow, sealing unit under protection of clean laminar flow and post processing unit. Its advantages are simple method and high sterilizing effect.

Description

The microwave sterilizing equipment of bagged food containing water and method

In the traditional industry, the sterilization of bagged food containing water adopts high temperature, autoclaving method or other long-time heating, pressurization to sterilize usually, after long high temperature, HIGH PRESSURE TREATMENT, though various microorganisms, the bacterium of food have been killed in the bag, but color and luster, fragrance, mouthfeel, the shape of food have been subjected to heavy damage in the bag, nutrition descends greatly, especially the destruction maximum of vitamin content.For shortening the quality of sterilization time, raising sterilising food prods, microwave technology and equipment are applied in the food processing in a large number.New technology and new product that countries in the world are released have: the U.S. releases packed food microwave pressurization sterilization technology and equipment in the seventies later stage, Japan in the eighties release microwave preheating under the packed food open state mid-term, seal again, the technology and equipment of microwave disinfection more thereafter.The method that the packed food microwave sterilization generally adopts in China's food industry is: packaging seal after the sterilization of low water content food direct sealing, the high-moisture food employing sterilization.More above-mentioned several technology and equipments, first defective is: need carry out the pressure adjustment in the operation, the disinfection structure device is complicated, causes valuable product, is unfavorable for the practical application and the popularization of product.Second deficiency is: 1) need spend a large amount of expenses, 2 on packing container) inhomogeneities of preheating or the heating using microwave of sterilization section can't overcome 3) a large amount of steam that produce of sterilization section heating using microwave will cause quick-fried (expanding) bag.The 3rd problem is: quick-fried bag is wanted in sterilization after the low water content food direct sealing, overlong time, and deficiency of time does not have bactericidal effect; Seal behind the high-moisture food sterilization, inhomogeneous, the no thoroughness of existing food heating and sterilization have back twice pollution problem to seal package of sterilization again, and quality can't guarantee.

The present invention is a kind of equipment that combines with microwave energy sterilization technology and aseptic clean technology, realizes the equipment and the method for bagged food containing water sterilization with this.

The invention provides a kind of microwave energy, heat conduction heating, purification laminar flow (aseptic clean technology) and automatic sealing technology utilized, realize the equipment and the method for all bagged food containing waters sterilizations.This method was both easy and simple to handle, and sterilization effect is remarkable again.

Microwave equipment of the present invention is made up of following five parts:

1, microwave, hot blast preliminary heating section,

2, thermometric feedback fraction,

3, the microwave sterilization under the protection of purification laminar flow,

4, the closure part under the protection of purification laminar flow,

5, sterilization post processing adjustment member.

See for details shown in the accompanying drawing 1.

Principle of the present invention constitutes as depicted in figs. 1 and 2:

1, sterilization preliminary heating section equipment provides thermal source jointly by microwave energy and hot blast (air-flow), makes food carry out the basal temperature of whole heating, lifting food rapidly, food is reached be lower than or near sterilising temp.Usually according to the difference that contains the bacterium situation in the food, get different sterilising temp values.Owing to exist the food Distribution of temperature rise inhomogeneous in the microwave heating process, the effect of hot blast or thermal current can adjust, it is inhomogeneous to improve being heated of the food that causes because of shape of food or food size, how many skewness, and the food that causes of microwave energy skewness be heated inhomogeneous.

2, the thermometric control section adopts thermocouple and infrared ray contactless temperature-measuring method, both measures, shown the preliminary heating section food heating Da Wendu of institute, the sterilization section equipment food sterilization heating Da Wendu of institute, and the post processing sterilization section food heat-insulation heating Da Wendu of institute; Can provide thermal source (microwave and hot blast) adjustment, control to any part wherein again.

3, the microwave sterilization part under the protection of purification laminar flow places the protection of purification laminar flow hot-air down with the micro-wave oven working chamber, and food after preheating is carried out heat sterilization.Aseptic clean technology requires sternly, effective to be applied in the medical and health industry because of it.And food industry need reach " aseptic " sanitary condition because of its space cost height to entering production spatial operation personnel, and the production management difficulty is used greatly and seldom.Purifying laminar flow hood is a kind of air cleaning member that local high clean environment is provided, and can be installed in the top that needs the high-cleanness, high environment neatly, and price is lower.Purify laminar flow hood with air with certain wind speed by behind the high efficiency particulate air filter, all press by damping layer, make that pure air stream is vertically, way flow is sent into the workspace, thereby guaranteed to reach in the workspace cleanliness factor of technological requirement.Select hundred grades of workspaces that purify the laminar flow protection, the suspension of 0.5 μ m particle diameter is less than 4 in the interior every litres of air in zone.Purify the application among a small circle of laminar-flow technique, both improved the sanitary condition of work subenvironment, do not have personal management requirement strict in the medical and health industry again.Purifying under the protection of laminar flow hot-air, the air in the microwave oven heating cavity is germ-free condition, and food enclosed in sealed is not had germ contamination.Through purifying the hot-air of laminar flow, also can improve, adjust the uniformity of heating using microwave.After microwave intensification sterilization, the bacterium in the packed food can be killed substantially.But, need to get different sterilising temps and time according to the difference that contains the bacterium situation in the food.See accompanying drawing Fig. 3.

4, purify laminar flow protection closure part down, food behind the microwave sterilization and food sealing machine closure part are placed purify laminar flow and carry out under protecting.So, just can guarantee behind the microwave sterilization food no microbiological contamination chance to the seal package.

5, sterilization post processing adjustment member is carried out sterilization insulation on the index bacterium lethal temperature curve to sealing food, and bacterium is killed after the insulation of sterilization soaking zone fully.The selection of temperature retention time should be decided as the case may be, generally is no less than 3 minutes.And then food cooked cooling.

Microwave part characteristics of the present invention are as follows:

Fig. 1 is the microwave sterilization frame principle figure that uses among the present invention, and this block diagram has five parts and constitutes, and each part all can have multiple implementation.

Fig. 2 is the microwave sterilization schematic diagram under the purification laminar flow protection of using among the present invention.Airtight from being between micro-wave oven discharging opening and the pocket type sealing machine passage, clean (aseptic) state.Wherein

A1 refers to microwave and hot blast heating part

A2 refers to purify the microwave sterilization machine under the laminar flow protection,

A3 refers to automatically closing device continuously,

A4 refers to purify the clean room under the laminar flow protection,

A5 refers to discharge port,

The A6 post processing (cooling) that refers to sterilize,

A7 refers to transmission direction,

A8 refers to purify laminar flow hood,

A9 microwave device for preventing leakage.

Fig. 3 is the sterilising temp (T) and sterilization time (t) graph of a relation that microwave sterilization uses, and wherein T1, T2, T3 represent the temperature of killing of different index bacteriums respectively; Ta-tA, tb-tB, tc-tC represent respectively under T1, T2, the T3 different temperatures, kill the required time of index bacterium fully.

Fig. 4 is a relation of killing micro organism quantity (Q) and sterilization time (t) under the index bacterium temperature (T).

Application example of the present invention has:

1, the sterilization fresh of prepared food such as packed roast chicken, roasted goose, boiled salted duck;

2, the sterilization fresh of prepared food such as pot-stewed fowl spiced beef, pork roast pork, sauce chop;

3, the sterilization fresh of prepared food such as the outstanding fish of pot-stewed fowl, roasting order fish, smoked fish, mackerel;

4, the sterilization fresh of the big packing cube meat of instant noodles, fishes and shrimps prepared food;

5, the sterilization fresh of cake such as moon cake, cake.

Claims

Claim:

1) in the food sterilizing, adopts microwave and hot blast mixing pre-heating temperature elevation method.This method has improved the uniformity that food is heated and has shortened the microwave sterilization section heating-up time.The shortening of sterilization section heating-up time makes color, the shape of food destroy minimum.
2) adopt the heating using microwave sterilization technology that purifies under the laminar flow protection.Enter clean room (aseptic) after realization packed food opening sterilization or the sterilization and seal, logical filtrated air, logical high-temperature hot air method all are the categories of this method in the microwave cavity.
3) microwave sterilization combines with sealing tech under purifying the laminar flow protection.Microwave sterilization wherein replaces with hot blast (thermal current, hot bath) sterilization, also is this patent protection category.
4) after the heating using microwave sterilization, adopt the technology and the method for microwave sterilization post processing.According to bacterium lethal temperature curve, in the sterilising temp section food was carried out insulated sterilizing 3-5 minute, be the method for complete kill bacteria, be again replenishing of microwave sterilization production technology.
5) sterilization of the block diagram shown in the patent figures 1 thought.Will be wherein in A, B, C, D, E five parts A, B merge, A, B, D merge, part is save E, save the method for E or D after, add the method for cooling procedure, all be the category that this patent sterilization is protected.