CN113911994A - Food processing technology of easy-to-tear cover packaging container - Google Patents
Food processing technology of easy-to-tear cover packaging container Download PDFInfo
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- CN113911994A CN113911994A CN202111218644.4A CN202111218644A CN113911994A CN 113911994 A CN113911994 A CN 113911994A CN 202111218644 A CN202111218644 A CN 202111218644A CN 113911994 A CN113911994 A CN 113911994A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C7/00—Concurrent cleaning, filling, and closing of bottles; Processes or devices for at least two of these operations
- B67C7/0073—Sterilising, aseptic filling and closing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
- B67B6/00—Closing bottles, jars or similar containers by applying closure members, not provided for in groups B67B1/00 - B67B5/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
- B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
- B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
- B67C3/22—Details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
The invention discloses a food processing technology of an easy-to-tear-cover packaging container, which comprises the steps of putting food raw materials into the container, injecting a liquid preparation with the temperature of more than or equal to 65 ℃, carrying out steam injection before film sealing, and carrying out sterilization by reversely buckling the film surface of the container downwards after the film sealing, wherein the sterilization process comprises step-type pressure rise and temperature rise, constant-pressure heat preservation and sterilization and step-type pressure reduction and temperature reduction, the step-type pressure rise and temperature rise process comprises a plurality of temperature rise stages, the step-type pressure reduction and temperature reduction process comprises a plurality of temperature reduction stages, and the air pressure is correspondingly set according to the temperatures of different stages so as to reduce the air pressure difference inside and outside the container. Compared with the prior art, the invention can thoroughly solve the problems of film breaking, film punching and tank deformation in the sterilization process of the easy-to-tear food packaging container, and particularly the problems of uneven sealing film and bulging caused by film stretching after sterilization.
Description
Technical Field
The invention relates to the technical field of food packaging, in particular to a food processing technology of an easy-to-tear-cover packaging container.
Background
At present, the common cans sealed by easy-to-tear covers in the food industry are easy to break films, punch films and deform in the sterilization process, and particularly the problems of unevenness and bulging of sealing films caused by stretching of the films after sterilization are solved. The common solutions at present are vacuum sealing and high-temperature hot-filling sealing. Although the problem of bulging can be solved through increasing evacuation equipment to the sealing equipment, because the evacuation time is longer, must have the filling to seal the problem that efficiency is slow, can't satisfy the industrial production demand. When vacuum pumping equipment is not added, high-temperature hot filling is adopted, the problem that the metal bowl bulges after being sealed can be solved only when the central temperature of the tank is above 84 ℃, in the filling and sealing process, the temperature of the prepared liquid is reduced due to the sealing head, the space environment, the metal bowl and the sealing waiting time after liquid discharging, and the temperature of the prepared liquid is required to be kept above 95 ℃ so that the central temperature of the tank is above 84 ℃. In addition, in the production process, the temperature of the prepared solution needs to be kept above 95 ℃ for a long time until the sealing is finished, so that the reducing sugar and the amino acid/protein generate Maillard reaction, the color and luster of the sterilized product are yellow, and the sense and the quality of the product are influenced.
Therefore, the technical problem to be solved by the technical staff in the field is how to provide a production process of an easy-to-tear food packaging container, which has a flat sealing film surface, no tympanic membrane, no film punching, no film breaking and no deformation of a can body after the product is sterilized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a food processing technology of an easy-to-tear cover packaging container.
In order to achieve the purpose, the invention provides the following technical scheme:
the food processing technology is characterized in that food raw materials are put into a container and then injected with a preparation liquid with the temperature being more than or equal to 65 ℃, steam injection is carried out before film sealing, the film surface of the container is reversely buckled downwards after the film sealing for sterilization, the sterilization process comprises step-type pressure-boosting and temperature-rising, constant-pressure heat-preservation sterilization and step-type pressure-reducing and temperature-reducing, the step-type pressure-boosting and temperature-rising process comprises a plurality of temperature-rising stages, the step-type pressure-reducing and temperature-reducing process comprises a plurality of temperature-reducing stages, air pressure is correspondingly set according to the temperatures of the different stages, and the air pressure difference between the inside and the outside of the container is reduced.
Furthermore, the air pressure in the same temperature rising stage or temperature lowering stage is constant pressure or the size and the change rate of the air pressure are positively correlated with the size and the change rate of the temperature.
Further, in each temperature rise stage or temperature drop stage, the magnitude of the air pressure is positively correlated with the magnitude of the temperature.
Further, the steam pressure of the steam injection is 0.05-0.15Mpa, and the injection time is 1-5 s.
Further, the temperature change rate of each temperature rising stage or temperature lowering stage is 1-7 ℃/min.
Further, in the step-type pressure increasing and temperature rising process, the temperature is gradually increased from the initial temperature to 121 ℃, and the pressure is gradually increased from 0MPa to 0.180-0.210 MPa; the constant-pressure heat-preservation sterilization temperature is 121 ℃, and the heat-preservation time is 13-19 min; in the step-type pressure reduction and temperature reduction process, the temperature is gradually reduced from 121 ℃ to 25-35 ℃, and the pressure is gradually reduced from 0.180-0.210Mpa to 0 Mpa.
Further, the step-type boosting and temperature rising process comprises four temperature rising and pressure rising stages:
a first temperature rise stage: heating to 75-85 deg.C under constant pressure of 0-0.010MPa for 4-8 min;
a second temperature rise stage: heating to 85-100 deg.C under constant pressure of 0.040-0.100MPa for 3-5 min;
a third temperature rise stage: raising the temperature of the sterilization environment to 100-115 ℃, keeping the pressure at 0.130-0.160MPa and the temperature for 3-5 min;
and a fourth temperature rise stage: the temperature of the sterilization environment is raised to 121 ℃, the pressure of the process is constant pressure of 0.180-0.210MPa, and the temperature rise time is 2-4 min.
Further, the stepped pressure reduction and temperature reduction process comprises six temperature reduction and pressure reduction stages:
a first cooling stage: the temperature of the sterilization environment is reduced from 121 ℃ to 105 ℃ and 110 ℃ for 2-4min, and the constant pressure can be 0.180-0.210 Mpa;
and a second cooling stage: the temperature of the sterilization environment is reduced from 105-110 ℃ to 95-100 ℃, the temperature reduction time is 3-6min, and the constant pressure is 0.160-0.190 MPa;
a third cooling stage: cooling the sterilization environment from 95-100 deg.C to 85-90 deg.C for 3-6min, and keeping constant pressure at 0.140-0.170 MPa;
and a cooling stage four: cooling the sterilization environment from 85-90 deg.C to 75-80 deg.C for 4-7min, and keeping constant pressure at 0.120-0.150 MPa;
a fifth cooling stage: cooling the sterilization environment from 75-80 deg.C to 45-50 deg.C for 4-8min, and keeping constant pressure at 0.100-0.130 MPa;
a sixth cooling stage: cooling the sterilization environment from 45-50 deg.C to 25-35 deg.C for 4-8min, and keeping constant pressure at 0.050-0.000 MPa; and taking out after cooling.
According to another aspect of the present invention, there is provided a easy-to-tear food packaging container, which is sealed by the easy-to-tear film sealing process.
Further, the easily torn cover is an aluminum foil easily torn cover, and the food package is easily used for containing the instant edible bird's nest.
The invention has the beneficial effects that:
the invention can thoroughly solve the problems of film rupture, film punching and tank deformation in the sterilization process of the easy-to-tear food packaging container, and particularly the problems of unevenness and bulge of the sealing film caused by film stretching after sterilization.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described clearly and completely with reference to the attached tables, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying tables, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
According to one aspect of the invention, a food processing technology of an easy-to-tear cover packaging container is provided, the technology comprises the steps of injecting a liquid preparation with the temperature being more than or equal to 65 ℃ after food raw materials are placed in the container, carrying out steam injection before film sealing, and carrying out sterilization by reversely buckling the film surface of the container downwards after the film sealing, wherein the sterilization process comprises step-type pressure rise and temperature rise, constant-pressure heat preservation and sterilization and step-type pressure reduction and temperature reduction, the step-type pressure rise and temperature rise process comprises a plurality of temperature rise stages, the step-type pressure reduction and temperature reduction process comprises a plurality of temperature reduction stages, and the air pressure difference between the inside and the outside of the container is reduced by correspondingly setting the air pressure according to the temperatures of different stages. The air pressure in the same temperature rising stage or the same temperature lowering stage is constant pressure or the size and the change rate of the air pressure are positively correlated with the size and the change rate of the temperature, namely the size and the change rate of the air pressure are increased along with the increase of the size and the change rate of the temperature, and vice versa. In each temperature rise stage or temperature drop stage, the air pressure is positively correlated with the temperature, namely the air pressure corresponding to the stage with high temperature is large, and the air pressure corresponding to the stage with low temperature is small. The temperature in the container is increased or decreased along with the increase or decrease of the temperature of the sterilization environment, the pressure in the container is increased or decreased along with the increase or decrease of the temperature of the sterilization environment, and the pressure of the sterilization environment is increased or decreased along with the increase or decrease of the temperature of the sterilization environment in order to ensure that the membrane is not flushed, the can is broken and the membrane surface is stretched, so that the balance of the internal pressure and the external pressure of the container is achieved. Meanwhile, the problem of membrane surface stretching can be further improved by controlling the heating or cooling rate to be 1-7 ℃/min, the membrane surface stretching rate is increased when the heating or cooling rate is too high, the production efficiency is reduced and the oxidation and nutrition loss of products are increased when the heating or cooling rate is too low.
The following illustrates the application of the process of the present invention to the production of instant edible bird's nest packaging containers, and it should be noted that the present invention is also applicable to the process of other similar easy-to-tear-cover food packaging containers, and therefore, the illustration should not be construed as limiting the scope of the present invention.
The specific production process provided by the invention comprises the following steps of:
1) filling, namely putting the bird's nest wire or other raw materials into a metal bowl made of aluminum or tinplate, and injecting sugar liquid with the temperature of more than or equal to 65 ℃.
2) And (3) sealing: covering with aluminum foil easy-to-tear cover, spraying with steam of 0.05-0.15Mpa steam pressure at vertical spraying angle for 1-5s, and immediately sealing after spraying.
3) Frame swinging: and (4) performing inverted buckle type sterilization, namely sequentially inversely buckling the surfaces of the sealed metal bowls downwards, and orderly arranging the metal bowls in a sterilization frame for sterilization.
4) Sterilizing, cooling and taking out of the pot: sterilizing at 121 deg.C for 13-19 min. The temperature rise adopts cascaded pressure rise to rise, the sterilization adopts constant voltage heat preservation to disinfect, and the cooling adopts cascaded step down the pressure to reduce the temperature, and specific parameter is as follows:
4.1 temperature rising stage
a. A first temperature rise stage: heating to 75-85 deg.C, keeping constant pressure at 0-0.010MPa, and heating for 4-8 min;
b. a second temperature rise stage: heating to 85-100 deg.C, keeping constant pressure at 0.040-0.100MPa, and heating for 3-5 min;
c. a third temperature rise stage: the temperature in the sterilizer is raised to 100 ℃ and 115 ℃, the pressure at constant pressure can be 0.130-0.160MPa, and the temperature rise time is 3-5 min;
d. and a fourth temperature rise stage: the temperature in the sterilizer is raised to 121 ℃, the pressure in the process can be 0.180-0.210MPa at constant pressure, and the temperature rise time is 2-4 min.
4.2 Sterilization section
Maintaining at 121 deg.C for 13-19min, and sterilizing at constant pressure of 0.180-0.210 MPa.
4.3 Cooling section
e. A first cooling stage: cooling from 121 deg.C to 105 deg.C for 2-4min, and cooling at constant pressure of 0.180-0.210 MPa.
f. And a second cooling stage: the temperature in the sterilizer is reduced from 110 ℃ to 95-100 ℃ at 105-;
g. a third cooling stage: cooling the temperature in the sterilizer from 95-100 deg.C to 85-90 deg.C for 3-6min, and keeping constant pressure at 0.140-0.170 MPa;
h. and a cooling stage four: cooling the temperature in the sterilizer from 85-90 deg.C to 75-80 deg.C for 4-7min under constant pressure of 0.120-0.150 MPa;
i. a fifth cooling stage: cooling the temperature in the sterilizer from 75-80 deg.C to 45-50 deg.C for 4-8min, and keeping constant pressure at 0.100-0.130 MPa;
j. a sixth cooling stage: cooling the temperature in the sterilizer from 45-50 deg.C to 25-35 deg.C for 4-8min, and keeping constant pressure at 0.050-0.000 MPa; taking out the mixture after cooling.
1. In the processing technology, steam injection is adopted during sealing, so that a part of air in the bowl can be driven away, and the purpose of exhausting is achieved; meanwhile, the steam injection can improve the temperature of the contents in the bowl to a certain degree. The air exhaust and the temperature increase in the bowl can both improve the flatness of the bowl membrane after the metal bowl is sterilized and reduce the requirement of the temperature of the prepared liquid during canning.
2. The sterilization adopts the inverted buckle type sterilization, and the pressure generated by the expansion of air and contents in the bowl in the sterilization process is transferred from the membrane surface to the bottom of the bowl, so that the conditions of membrane flushing and membrane breaking can be reduced.
3. Along with the temperature rise or the temperature decrease in the metal bowl, the pressure in the bowl is increased or weakened, and in order to ensure that the bowl does not rush a membrane, break a pot and stretch the membrane surface, the pressure in the sterilization pot is increased or weakened, so that the pressure inside and outside the bowl is balanced. The sterilization process adopts a sterilization process of heating-constant temperature process, applying multi-stage stepped pressure rise and cooling, applying multi-stage stepped pressure drop, and can thoroughly solve the problems of bowl film rupture, film punching and tank deformation in the sterilization process of the metal bowl, and particularly the problems of unsmooth sealing film and bulging caused by film stretching after sterilization.
The technical points 1, 2 and 3 are used cooperatively:
1) the problems that the aluminum foil can product with the easily torn cover is easy to break and punch the film when being filled without vacuum pumping, the can is deformed, and particularly the sealing film is uneven and bulges due to the stretching of the film after sterilization are solved;
2) the filling and sealing efficiency is higher than that of a vacuumizing and sealing mode, and the method is in accordance with industrial production.
3) Compared with high-temperature sealing, the requirement on the temperature of the prepared liquid is reduced from more than or equal to 95 ℃ to more than or equal to 65 ℃, so that the service life of the filling head can be effectively prolonged; solves the problem of yellow color of the bird's nest product caused by long-time high-temperature heat preservation of the prepared liquid, and improves the product quality. The problem that hands of a person placing the frame of the product are easily scalded during sterilization due to high-temperature filling is solved.
The present invention will be described in detail with reference to examples and comparative examples. It should be noted that the following examples are conducted by using aluminum foil easy-to-tear lids and filling the instant edible bird's nest into a metal bowl, but the film sealing method provided by the present invention is also applicable to other similar processes for manufacturing easy-to-tear food packaging containers, and therefore the specific embodiments or comparative examples listed should not be construed as limiting the scope of the present invention.
Example 1
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) placing 3.5g nidus Collocaliae into metal bowl with bowl mouth diameter of 103mm, filling with automatic filling and sealing equipment at 65 deg.C, covering, spraying with 0.1MPa steam for 1s, sealing, and arranging the product in sterilizing frame in order to prepare for sterilization.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C in the sterilizer, sterilizing for 18min, and cooling to 110 deg.C under 0.200 MPa;
e. five sections of constant pressure cooling: cooling the temperature in the sterilizer from 110 deg.C to 100 deg.C for 3min under 0.180 MPa;
f. six sections of constant pressure cooling: cooling the temperature in the sterilizer from 100 deg.C to 90 deg.C for 4min under 0.160 MPa;
g. seven sections of constant pressure cooling: cooling the temperature in the sterilizer from 90 deg.C to 80 deg.C for 6min under 0.140 MPa;
h. eight-stage constant-pressure cooling: cooling the temperature in the sterilizer from 80 ℃ to 45 ℃ for 7min under the pressure of 0.100 MPa;
i. nine sections of constant pressure cooling: the temperature in the sterilizer is reduced from 45 ℃ to 30 ℃, the temperature reduction time is 8min, and the constant pressure is 0.030 MPa; taking out the mixture after cooling.
3) Cooling to normal temperature to obtain the bowl-packaged cubilose can with the aluminum foil easy-to-tear cover.
Example 2
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) placing 3.5g nidus Collocaliae into metal bowl with bowl mouth diameter of 103mm, filling with automatic filling and sealing equipment at 75 deg.C, covering, spraying with 0.1MPa steam for 1s, sealing, and arranging the product in sterilizing frame in order to prepare for sterilization.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C in the sterilizer, sterilizing for 18min, and cooling to 110 deg.C under 0.200 MPa;
e. five sections of constant pressure cooling: cooling the temperature in the sterilizer from 110 deg.C to 100 deg.C for 3min under 0.180 MPa;
f. six sections of constant pressure cooling: cooling the temperature in the sterilizer from 100 deg.C to 90 deg.C for 4min under 0.160 MPa;
g. seven sections of constant pressure cooling: cooling the temperature in the sterilizer from 90 deg.C to 80 deg.C for 6min under 0.140 MPa;
h. eight-stage constant-pressure cooling: cooling the temperature in the sterilizer from 80 ℃ to 45 ℃ for 7min under the pressure of 0.100 MPa;
i. nine sections of constant pressure cooling: the temperature in the sterilizer is reduced from 45 ℃ to 30 ℃, the temperature reduction time is 8min, and the constant pressure is 0.030 MPa; taking out the mixture after cooling.
3) Cooling to normal temperature to obtain the bowl-packaged cubilose can with the aluminum foil easy-to-tear cover.
Comparative example 1
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) 3.5g of cubilose is placed into a metal bowl made of aluminum materials with the diameter of the bowl opening being 103mm, liquid filling is carried out by automatic filling and sealing equipment, the filling temperature is 65 ℃, after sealing, the product is placed in a sterilization frame in a mode that the film surface faces upwards, and sterilization is prepared.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C, sterilizing for 18min, cooling for 28min, and cooling to 30 deg.C under constant pressure of 0.200 MPa.
3) Taking out of the pot to obtain the aluminum foil canned bird's nest with easy-tearing cover and bowl
Comparative example 2
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) placing 3.5g nidus Collocaliae into metal bowl with bowl mouth diameter of 103mm, filling with automatic filling and sealing equipment at 60 deg.C, covering, spraying with 0.1MPa steam for 1s, sealing, and arranging the product in sterilizing frame.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C in the sterilizer, sterilizing for 18min, and cooling to 110 deg.C under 0.200 MPa;
e. five sections of constant pressure cooling: cooling the temperature in the sterilizer from 110 deg.C to 100 deg.C for 3min under 0.180 MPa;
f. six sections of constant pressure cooling: cooling the temperature in the sterilizer from 100 deg.C to 90 deg.C for 4min under 0.160 MPa;
g. seven sections of constant pressure cooling: cooling the temperature in the sterilizer from 90 deg.C to 80 deg.C for 6min under 0.140 MPa;
h. eight-stage constant-pressure cooling: cooling the temperature in the sterilizer from 80 ℃ to 45 ℃ for 7min under the pressure of 0.100 MPa;
i. nine sections of constant pressure cooling: the temperature in the sterilizer is reduced from 45 ℃ to 30 ℃, the temperature reduction time is 8min, and the constant pressure is 0.030 MPa; taking out the mixture after cooling.
3) Cooling to normal temperature to obtain the bowl-packaged cubilose can with the aluminum foil easy-to-tear cover.
Comparative example 3
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) placing 3.5g nidus Collocaliae into metal bowl with bowl mouth diameter of 103mm, filling with automatic filling and sealing equipment at 65 deg.C, covering, spraying with 0.1MPa steam for 1s, sealing, and arranging the product in sterilizing frame in order to prepare for sterilization.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C, sterilizing for 18min, cooling for 28min, and cooling to 30 deg.C under constant pressure of 0.200 MPa.
3) Taking out of the pot to obtain the aluminum foil canned bird's nest with easy-tearing cover and bowl
Comparative example 4
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) 3.5g of cubilose is put into an aluminum metal bowl with the diameter of the bowl mouth being 103mm, liquid is filled by automatic filling and sealing equipment, the filling temperature is 65 ℃, and after sealing, the product is reversely, tidily arranged in a sterilization frame and ready for sterilization.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: heating the sterilization pot from 100 deg.C to 115 deg.C under 0.155MPa for 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C in the sterilizer, sterilizing for 18min, and cooling to 110 deg.C under 0.200 MPa;
e. five sections of constant pressure cooling: cooling the temperature in the sterilizer from 110 deg.C to 100 deg.C for 3min under 0.180 MPa;
f. six sections of constant pressure cooling: cooling the temperature in the sterilizer from 100 deg.C to 90 deg.C for 4min under 0.160 MPa;
g. seven sections of constant pressure cooling: cooling the temperature in the sterilizer from 90 deg.C to 80 deg.C for 6min under 0.140 MPa;
h. eight-stage constant-pressure cooling: cooling the temperature in the sterilizer from 80 ℃ to 45 ℃ for 7min under the pressure of 0.100 MPa;
i. nine sections of constant pressure cooling: the temperature in the sterilizer is reduced from 45 ℃ to 30 ℃, the temperature reduction time is 8min, and the constant pressure is 0.030 MPa; taking out the mixture after cooling.
3) Cooling to normal temperature to obtain the bowl-packaged cubilose can with the aluminum foil easy-to-tear cover.
Comparative example 5
A production process of a can with an easily torn aluminum foil cover comprises the following steps:
1) placing 3.5g nidus Collocaliae into metal bowl with bowl mouth diameter of 103mm, filling with automatic filling and sealing equipment at 65 deg.C, covering, spraying with 0.1MPa steam for 1s, sealing, placing the product with membrane facing upwards, and sterilizing.
2) Sterilizing, cooling and taking out of the pot:
a. first-stage constant-pressure temperature rise: heating to 85 deg.C under 0.005MPa for 4 min;
b. two-stage constant-pressure temperature rise: heating the sterilizer from 85 deg.C to 100 deg.C under 0.060MPa for 3 min;
c. three-stage constant-pressure heating: the temperature in the pot is increased from 100 ℃ to 115 ℃, the pressure is 0.155MPa, and the time is 4 min;
d. and (5) constant-pressure sterilization and cooling in four sections: heating to 121 deg.C in the sterilizer, sterilizing for 18min, and cooling to 110 deg.C under 0.200 MPa;
e. five sections of constant pressure cooling: cooling the temperature in the sterilizer from 110 deg.C to 100 deg.C for 3min under 0.180 MPa;
f. six sections of constant pressure cooling: cooling the temperature in the sterilizer from 100 deg.C to 90 deg.C for 4min under 0.160 MPa;
g. seven sections of constant pressure cooling: cooling the temperature in the sterilizer from 90 deg.C to 80 deg.C for 6min under 0.140 MPa;
h. eight-stage constant-pressure cooling: cooling the temperature in the sterilizer from 80 ℃ to 45 ℃ for 7min under the pressure of 0.100 MPa;
i. nine sections of constant pressure cooling: the temperature in the sterilizer is reduced from 45 ℃ to 30 ℃, the temperature reduction time is 8min, and the constant pressure is 0.030 MPa; taking out the mixture after cooling.
3) Cooling to normal temperature to obtain the bowl-packaged cubilose can with the aluminum foil easy-to-tear cover.
Comparative analysis and results
Attached table 1
And (3) comparing and analyzing the appearance identification of the sterilized metal bowl-contained cubilose can product, and the result is shown in attached table 1.
In conclusion, in the production process of the metal bowl-loaded can sealed by the aluminum foil easy-to-tear cover, the filling temperature, the steam injection mode, the cooling pressure and the product placing mode are important factors influencing the metal bowl-loaded can, the bowl-loaded can produced by the process disclosed by the invention is sterilized by inverted buckling after being filled and vertically injected by steam, and the temperature is increased by adopting step pressure and temperature rise, and the cooling is reduced by adopting step pressure and temperature drop, so that the aluminum foil easy-to-tear cover metal can which is free from leakage, has slightly concave film surface, is flat and attractive and has complete bowl body can be produced on the basis of no vacuum pumping in the filling process.
According to another aspect of the invention, the easy-to-tear food packaging container is provided, and the technical effects of no can leakage, slight concave film surface, flatness, attractiveness and complete bowl body can be obtained by adopting the process for sealing the easy-to-tear cover.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design idea of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A food processing technology of an easy-to-tear cover packaging container is characterized in that a food raw material is placed in the container and then injected with a liquid with the temperature being more than or equal to 65 ℃, steam injection is carried out before film sealing, the film surface of the container is reversely buckled downwards after the film sealing for sterilization, the sterilization process comprises step-type pressure-boosting and temperature-rising, constant-pressure heat-preservation and sterilization and step-type pressure-reducing and temperature-reducing, the step-type pressure-boosting and temperature-rising process comprises a plurality of temperature-rising stages, the step-type pressure-reducing and temperature-reducing process comprises a plurality of temperature-reducing stages, air pressure is correspondingly set according to the temperatures of different stages, and the air pressure difference inside and outside the container is reduced.
2. The process of claim 1, wherein the pressure in the same heating stage or cooling stage is constant or the magnitude and rate of change of the pressure are positively correlated to the magnitude and rate of change of the temperature.
3. The process of claim 2, wherein the pressure of the gas is positively correlated to the temperature during each of the temperature raising and lowering stages.
4. The process for preparing a food product with a peel-off container according to claim 1, wherein the steam is injected under a pressure of 0.05-0.15Mpa for a period of 1-5 s.
5. A process according to claim 3, wherein the rate of change of temperature during each said warming or cooling phase is from 1 to 7 ℃/min.
6. The process for preparing a food product with a peel-off container according to claim 1, wherein the temperature is gradually increased from an initial temperature to 121 ℃ and the pressure is gradually increased from 0MPa to 0.180-0.210MPa during the step-shaped pressure increasing and temperature increasing process; the constant-pressure heat-preservation sterilization temperature is 121 ℃, and the heat-preservation time is 13-19 min; in the step-type pressure reduction and temperature reduction process, the temperature is gradually reduced from 121 ℃ to 25-35 ℃, and the pressure is gradually reduced from 0.180-0.210Mpa to 0 Mpa.
7. The process for processing food with a peel-off packaging container according to claim 6, wherein the step-shaped pressure-rise and temperature-rise process comprises four temperature-rise stages:
a first temperature rise stage: heating to 75-85 deg.C under constant pressure of 0-0.010MPa for 4-8 min;
a second temperature rise stage: heating to 85-100 deg.C under constant pressure of 0.040-0.100MPa for 3-5 min;
a third temperature rise stage: raising the temperature of the sterilization environment to 100-115 ℃, keeping the pressure at 0.130-0.160MPa and the temperature for 3-5 min;
and a fourth temperature rise stage: the temperature of the sterilization environment is raised to 121 ℃, the pressure of the process is constant pressure of 0.180-0.210MPa, and the temperature rise time is 2-4 min.
8. The food processing technology of the easy-to-tear-cover packaging container according to claim 7, wherein the step-type pressure and temperature reduction process comprises six temperature reduction stages:
a first cooling stage: the temperature of the sterilization environment is reduced from 121 ℃ to 105 ℃ and 110 ℃ for 2-4min, and the constant pressure can be 0.180-0.210 Mpa;
and a second cooling stage: the temperature of the sterilization environment is reduced from 105-110 ℃ to 95-100 ℃, the temperature reduction time is 3-6min, and the constant pressure is 0.160-0.190 MPa;
a third cooling stage: cooling the sterilization environment from 95-100 deg.C to 85-90 deg.C for 3-6min, and keeping constant pressure at 0.140-0.170 MPa;
and a cooling stage four: cooling the sterilization environment from 85-90 deg.C to 75-80 deg.C for 4-7min, and keeping constant pressure at 0.120-0.150 MPa;
a fifth cooling stage: cooling the sterilization environment from 75-80 deg.C to 45-50 deg.C for 4-8min, and keeping constant pressure at 0.100-0.130 MPa;
a sixth cooling stage: cooling the sterilization environment from 45-50 deg.C to 25-35 deg.C for 4-8min, and keeping constant pressure at 0.050-0.000 MPa; and taking out after cooling.
9. A food packaging container with a tear-off lid, characterized in that the sealing of the tear-off lid is carried out by a process according to any one of claims 1 to 8.
10. The easy-to-tear food packaging container as claimed in claim 9, wherein the easy-to-tear cover is an aluminum foil easy-to-tear cover, and the food packaging container is used for containing instant edible bird's nest.
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