Research on barrier performance testing technology of pet food packaging bag

Abstract: with the development of economy and the improvement of people's living standard, more and more pets come into more and more families, corresponding to the rapid development of pet food industry As the common food industry, pet food industry also has corresponding requirements for product safety and quality Like other foods, pet food has a certain shelf life During the shelf life, pet food should be guaranteed not to deteriorate or lose nutrients There are many factors that affect the shelf life of pet food, such as the use of additives (preservatives), packaging, storage conditions (temperature, light, etc.) The purpose of this paper is to discuss the effect of barrier of packaging materials on the shelf life of pet food and the method of barrier detection Keywords: pet food, packaging, barrier, shelf life author: Jinan Languang mechanical and Electrical Technology Co., Ltd with the development of economy and the improvement of people's living standard, more and more pets have entered more and more families, corresponding to the rapid development of pet food industry As the common food industry, pet food industry also has corresponding requirements for product safety and quality Like other foods, pet food has a certain shelf life During the shelf life, pet food should be guaranteed not to deteriorate or lose nutrients There are many factors that affect the shelf life of pet food, such as the use of additives (preservatives), packaging, storage conditions (temperature, light, etc.) The purpose of this paper is to discuss the effect of barrier of packaging materials on the shelf life of pet food and the method of barrier detection According to AAFCO standards, the main nutrients in pet food are protein (more than 18%) and fat, and the auxiliary nutrients are amino acid, mineral, crude fiber, crude ash and vitamins These nutrients can meet the needs of pet growth, keep the color of pet hair bright, but also a good natural medium for microorganisms The protein in pet food will be decomposed into organic amines, mercaptans and other substances under the action of microorganism, which has the odor and causes food corruption The fat in pet food is easily decomposed by microorganism and produces rancidity substances such as ketones and aldehydes with pungent odor These decomposed low molecular substances not only affect the sense of pet food, but also have lost the nutritional value of protein, fat and other original substances Therefore, both in the production process and on the shelf, the activity of microorganisms should be inhibited as much as possible As we all know, the breeding of microorganisms needs a certain environment, among which three important factors of Zui are environmental temperature, oxygen and water Oxygen is the main external cause of rancidity, the less oxygen content, the less possibility of rancidity, and water can provide an active environment for microorganisms, accelerate the hydrolysis of fat, and shorten the shelf life of food In the shelf life, the content of oxygen and water in the package is more dependent on the integrity and barrier performance of pet food packaging bag The barrier performance of packaging materials is very important for the shelf life of pet food The effect of barrier of packaging materials on the shelf life of pet food during the shelf life, the oxygen and water in the complete pet food packaging mainly come from the oxygen and water vapor infiltrated through the packaging Barrier refers to the barrier effect of packaging materials on the penetration of gas or liquid molecules through the materials Labthink blue light selects seven common pet food packaging materials pet, pet + CPP, BOPP / CPP, BOPET / PE, OPP / PE / CPP, BOPET / VMPET / LDPE and aluminum-plastic composite film in the market, and tests, analyzes and compares their oxygen and water vapor transmittance respectively The greater the oxygen permeability is, the worse the material's oxygen resistance is; the greater the water vapor permeability is, the worse the material's moisture resistance is Oxygen permeability test: this test adopts Labthink blue ox2 / 230 oxygen transmittance test system, and the instrument adopts the principle of isobaric test During the test, the sample was first balanced in the standard environment (23 ± 2 ℃, 50% RH) for 48h, and the round sample was cut from the non wrinkled part Install the pre-treatment sample into the middle of the upper and lower cavities of the ox2 / 230 oxygen transmittance test system At this time, the upper and lower cavities of the sample will be divided The upper chamber is the flowing high-purity oxygen, and the lower chamber is the flowing high-purity nitrogen During the test, oxygen molecules enter the lower chamber through the sample, and are brought to the oxygen sensor by the flowing high-purity nitrogen The concentration of oxygen penetrated is detected by the oxygen sensor, and then the oxygen permeability and other parameters of the sample are calculated This test adopts the test conditions of 23 ℃ and 50% RH Moisture permeability test: in addition to oxygen, moisture penetration in the air will also accelerate the deterioration process of pet food This measurement uses Labthink blue light W3 / 030 water vapor transmittance test system The instrument belongs to weighing method As for the oxygen resistance test, select the flat sample after balance, put the sample into the moisture cup equipped with the instrument, and put a proper amount of distilled water after secondary distillation into the moisture cup At this time, the humidity difference is formed on both sides of the sample During the test, the humidity difference between the two sides of the sample is controlled by controlling the humidity in the test chamber The water vapor transmittance of the sample is calculated by the weight reduction of the moisture permeable cup during the test This test adopts the measurement conditions of 38 ℃ and 90% RH See Table 1 for detailed test results of oxygen permeability and water vapor permeability in this test: analysis and comparison of test results of barrier performance of seven structures of pet food packaging It can be found that the oxygen resistance of different materials of pet food packaging varies greatly due to different composite materials (see Figure 1: oxygen permeability) Among the tested samples, aluminum plastic composite film, BOPET / VMPET / LDPE and PET / CPP composite film packaging have lower oxygen transmittance, while the corresponding pet food has a longer shelf life, which is closely related to the high barrier of packaging The composite film can improve the water vapor transmission of PET packaging materials The moisture resistance of PET packaging bags is poor, which is not conducive to the storage of pet food The shelf life of pet food in this packaging is short Conclusion: To sum up, the barrier of packaging materials is very important for the shelf life of pet food When choosing packaging materials, manufacturers should pay attention to the selection of composite plastic flexible packaging, aluminum plastic composite materials or tinplate materials with high barrier performance The choice of material should not only consider its oxygen and humidity resistance, but also consider the influence of environment on the material barrier performance For example, EVOH and PA materials are extremely sensitive to environmental humidity In normal temperature and low relative humidity, the two materials have good moisture resistance, but in high humidity environment, their moisture resistance will be greatly reduced Therefore, this material is not suitable for packing.