Editor's note:
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At present, the common milk packaging in the market is mainly: Tetra Pak, roof bags, sterile plastic bags, etc., of which sterile plastic bags of milk are favored by consumers at more affordable prices. Recently, our reporter learned from interviewing some dairy companies using sterile plastic bags that these companies have some problems in selecting and using sterile plastic bag filling machines. In response to these problems, the newspaper specially produced this album, hoping to help users solve these problems.
In addition, this newspaper particularly thanks Shanghai Zhangye Light Industry Equipment Co., Ltd., Hebei Tangshan Shichuang Sterile Milk Technology Co., Ltd. and Hangzhou Xinming Packaging Co. for its support for this album.
First, the basic performance requirements of a sterile plastic bag filling machine
The function of the aseptic plastic bag filling machine is to pack the sterilized food (dairy, etc.) in a sterile environment and seal it in a sterilized container in order to obtain it without preservatives and without refrigeration. Longer shelf life. (Figure)
Specifically, the aseptic bag filling machine must meet the following requirements:
1. The packaging container and closure method used must be suitable for aseptic filling, and the sealed container must be capable of blocking the passage of microorganisms during storage and distribution. At the same time, packaging containers 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 on the surface of the container prior to sterilization.
3. During the filling process, the product must not be contaminated by any external conditions such as parts of the equipment or the surrounding environment.
4. Sealing must be carried out within the sterilization zone to prevent microbial contamination.
Second, the performance of high-quality sterile plastic bag filling machine
With reference to the situation of the aseptic plastic bag filling machine at home and abroad, a high quality sterile plastic bag filling machine should have the following requirements:
1. Product meets Class A or Class B commercial aseptic requirements
According to the "Acceptance Specification for Liquid Food Packaging Equipment" (Draft for Soliciting Opinions), the inspection method is as follows:
(1) The total number of colonies should be determined according to GB 4789.2.
(2) Determination of coliform bacteria was performed in accordance with GB 4789.3.
(3) Salmonella test according to GB 4789.4 regulations.
(4) Shigella test according to GB 4789.5 regulations.
(5) Staphylococcus aureus test according to the provisions of GB 4789.10.
(6) Hemolytic Streptococcus test According to GB 4789.11 regulations.
(7) Mold and yeast counts are performed in accordance with the provisions of GB 4789.15.
(8) Microbial proliferation tests for liquid foods packaged in sterile Class A, sterile Class B, and hot fill equipment.
a. All samples were incubated at 36 ± 1 °C for 7 days;
b. Visual inspection of rising packs (bags, bottles), leaked unit samples, record quantities;
c. All other samples were opened for pH measurement and sensory inspection. Samples with a pH difference of more than 0.2 from the normal value of most samples and a doubtful sensory examination (turbidity, sedimentation, color change, smell, or taste change) were detected. Stain staining microscopy. With Gram stain staining and microscopy, at least 5 fields of view were observed to determine if there was any microbial proliferation. The number of sample records that will have microbial proliferation;
d. Adding the numbers of b and c records gives the total number of failed samples for microbial proliferation.
(9) The free residual chlorine test shall be conducted in accordance with the provisions of Section 37.1 of GB5750.
(10) The residual amount of H2O2 is tested in accordance with the provisions in Appendix A of GB14891.4.
2. Equipment has good adaptability
(1) Wide range of filling capacity
The current domestic and international better equipment filling capacity is 120 ~ 550ml / bag.
(2) Strong applicability to packaging materials
Better equipment can accommodate a wide 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 packaging materials, have a wide filling range, and achieve a higher packaging speed.
The current domestic and international production capacity of better equipment 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 a qualified product, the system should have a suitable alarm system to ensure that the system can send out alarm signals in time when a fault occurs and make corresponding linkage protection, such as stop filling and shutting down.
6. Low energy consumption
The consumption of electricity, compressed air, steam, water, and other energy sources should be small to reduce the user's cost of use.
7. Pouch leakage rate is low
About one ten-thousandth of the broken bag rate is good. If the rate of breached bags is less than one-thousandth, the equipment should be considered as unqualified.