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At present, the common milk packaging on the market mainly includes: Tetra Pak, roof bag, aseptic plastic bag, etc. Among them, the milk packed in aseptic plastic bag is deeply loved by consumers at a relatively affordable price.
Recently, it has been learned from some dairy companies that use aseptic plastic bags that some companies have some problems in selecting and using aseptic plastic bag filling machines. In order to better choose high quality aseptic plastic bag filling equipment, we will introduce the knowledge of aseptic plastic bag filling machine:
First, the basic performance requirements of aseptic plastic bag filling machine
The function of the aseptic plastic bag filling machine is to package the sterilized food (dairy products, etc.) in a sterile environment and enclose it in a sterilized container, in the hope that it can be obtained without preservatives or under refrigeration. Long shelf life.
Specifically, the aseptic plastic bag filling machine must meet the following requirements:
1. The packaging containers and closure methods used must be suitable for aseptic filling, and the sealed containers must be able to block the passage of microorganisms during storage and distribution. At the same time, the packaging container should have physical properties that prevent chemical changes in the product.
2. The surface of the container in contact with the product must be sterilized prior to filling. The effect of sterilization is related to the degree of contamination of the surface of the container prior to sterilization.
3. During the filling process, the product must not be contaminated by external conditions such as any equipment components or the surrounding environment.
4. Sealing must be carried out in a sterile area to prevent microbial contamination.
Second, the performance requirements of high quality aseptic plastic bag filling machine
Referring to the situation of aseptic plastic bag filling machines at home and abroad, a high-quality aseptic plastic bag filling machine should have the following requirements:
1. Product meets Class A or Class B commercial sterility requirements
According to the "Liquid Food Packaging Equipment Acceptance Specification" (Draft for Comment), the inspection method is as follows:
(1) The total number of colonies is determined according to the provisions of GB 4789.2.
(2) Determination of coliforms according to GB 4789.3.
(3) Salmonella test is carried out in accordance with the provisions of GB 4789.4.
(4) Shigella test is carried out in accordance with the provisions of GB 4789.5.
(5) Staphylococcus aureus test is carried out in accordance with the provisions of GB 4789.10.
(6) The test of hemolytic streptococcus is carried out in accordance with the provisions of GB 4789.11.
(7) Mold and yeast counts were carried out in accordance with the provisions of GB 4789.15.
(8) Microbial proliferation test of liquid foods packaged in sterile Class A, sterile Class B and hot filling equipment.
a. All samples were incubated at 36 ± 1 ° C for 7 days.
b. Visually check the ups (bags, bottles), leaked unit samples, and record the quantity.
c. Open all the remaining samples for pH measurement and sensory examination, and detect samples with a pH difference of more than 0.2 from the normal values ​​of most samples and suspected sensory examinations (turbidity, sedimentation, color change, smell or taste change, etc.). Staining microscopy. Gram staining and microscopic examination were performed by Gram staining, and at least 5 fields of view were observed to determine whether there was microbial proliferation. The number of samples that will have microbial proliferation will be recorded;
d. Add the number of b and c records to obtain the total number of unqualified samples of microbial proliferation indicators.
(9) The test of free residual chlorine shall be carried out in accordance with the provisions of Section 37.1 of GB5750.
(10) The residual amount of H2O2 is tested in accordance with the provisions of Appendix A of GB14891.9.
2. Equipment has good adaptability
(1) Wide range of filling capacity
At present, the filling capacity of better equipment at home and abroad is 120-550ml/bag.
(2) Applicability to packaging materials
Better equipment can adapt to a wider range of packaging materials, which allows users to have more choices for packaging materials.
3. Automatic Control System
The equipment can automatically complete the conveying, forming and sealing of the packaging materials, has a wide filling range, and achieves a high packaging speed.
At present, the production capacity of better equipment at home and abroad is 6000-7000 bags/hour.
4. Independent automatic CIP device
It is used for the cleaning of alkali solution, acid solution, sterile water before and after production and sterilization of high temperature steam.
5. System fault alarm and protection
In order to ensure that the filling machine produces qualified products, the system should have a suitable alarm system to ensure that the system can issue alarm signals in time when the system fails, and to make corresponding linkage protection, such as: stop filling, stop, etc.
6. Lower energy consumption
The consumption of energy such as electricity, compressed air, steam, and water should be small to reduce the user's use cost.
7. The rate of broken bags is lower. The rate of leaking bags of about one ten thousandth is better. If the leak rate is less than one thousandth, the equipment should be considered unqualified.