As a staple in daily life, dairy products play a vital role in people's diets. With the rising standard of living, consumers are becoming more discerning, and this has driven dairy manufacturers to continuously innovate and introduce new products. To meet these evolving demands, dairy packaging has also seen significant development, ranging from aseptic packaging, fresh milk packaging, retort-resistant packaging, to various formats such as square boxes, roof-shaped packages, soft plastic pouches, and bottles. Flexible packaging offers unique advantages in terms of convenience, protection, and aesthetics, and its share in the dairy packaging industry is steadily increasing. As a result, quality control in flexible packaging has become increasingly important. This article provides an overview of key quality inspection and analysis techniques for dairy flexible packaging.
I. Testing and Analysis of Composite Strength of Dairy Packaging Materials
Flexible packaging materials used in dairy products, such as sterile pouches, are typically made of composite plastics or paper-based materials. The higher the composite strength, the better, as it ensures resistance to tearing and damage. High-viscosity adhesives help prevent delamination, but they can increase production costs. Finding the right balance between performance and cost requires accurate testing of the composite layer. While general-purpose tensile machines are commonly used for peeling tests, they often lack precision. Jinan Languang’s PC-type intelligent electronic tensile testing machine is specifically designed for flexible packaging testing. It complies with GB 8808-88 standards, features a unique hoe-tailing function, and uses an integral method to measure force in the middle section. It displays real-time force values and curves, helping determine the appropriate adhesive type, assess composite uniformity, and analyze sample stability through curve superposition, allowing for precise process adjustments.
II. Testing and Analysis of Friction Coefficient of Dairy Packaging Materials
Measuring the friction coefficient of packaging materials helps control the opening quality of flexible bags and optimize packaging speed. Chinese-made equipment now meets international standards and includes features like oscillating coefficient settings to adapt to different film and paper types. Intelligent data processing, large-screen LCD display, and visual curve analysis help evaluate surface friction uniformity. For manufacturers, controlling the coefficient of friction involves testing the amount and type of additives in resins. However, differences in standards such as GB1006, ASTM D1894, and ISO8295 can create challenges. Labthink Languang’s MXD-02 machine addresses these issues by offering multiple standard detection functions, providing a reliable solution for cross-standard testing.
III. Testing and Analysis of Permeability and Moisture Permeability of Dairy Packaging
Breathability and moisture permeability are critical factors affecting dairy product quality. Instruments like Labthink Languang’s PERME OX2/230 oxygen transmission rate test system use the Coulomb principle to measure oxygen permeability in packaging films, bags, cans, and other flexible containers. This advanced system operates at an international level, featuring a host-and-satellite design that allows up to 30 samples to be tested simultaneously, significantly improving efficiency.
IV. Testing and Analysis of Heat Seal Strength of Dairy Packaging
Heat seal strength is a crucial performance indicator for flexible packaging. Proper sealing ensures that the contents remain intact during transport and storage. Jinan Languang’s PC-type intelligent electronic tensile testing machine is ideal for this task, automatically measuring force values and performing superposition analysis on samples. A heat seal tester is also essential for preparing and evaluating sealing samples.
V. Sealing Test Analysis of Dairy Packaging
Sealing tightness is vital for dairy packaging, as poor sealing can lead to leakage and spoilage. Common methods include vacuum testing according to national standards, where samples are subjected to pressures like -30kPa, -50kPa, etc., for 30 seconds. Visual inspection is often used, but quantitative testing via positive pressure methods, such as Labthink’s LSSD-01 leakage detector, offers more accurate results.
VI. Other Quality Inspection and Analysis Techniques
Beyond structural integrity, the appearance of packaging also plays a role in consumer appeal. Tools like the X-Rite spectrodensitometer can measure print density, color difference, and overprint ratio, while Labthink’s MCJ-01A and BLJ-02 testers assess ink adhesion and resistance. These tools help maintain high printing quality and brand consistency.
In conclusion, quality testing and analysis of dairy flexible packaging are essential for optimizing production processes and ensuring product safety. Through continuous testing and parameter refinement, manufacturers can improve both efficiency and quality, ultimately supporting the growth of the dairy industry.
Jinan Languang Electromechanical Technology Co., Ltd.
Jinan Languang Market Department
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