Effect of Low Temperature on Material Properties of Blister Boxes (Flocking)
Under low temperature environment, the properties of plastic materials and flocking materials of blister boxes will change. For the plastic part of blister boxes, low temperature may make it brittle and reduce toughness. This is because low temperature affects the movement of plastic molecular chains and reduces its flexibility. When subjected to external impact, such as collision during transportation or handling, brittle blister boxes are more likely to break. At low temperatures, the elasticity of flocking materials may decrease, making them easier to break. At the same time, low temperatures may affect the bonding strength between flocking and the surface of blister boxes. If the performance of the adhesive deteriorates at low temperatures, the flock may fall off, affecting the use function and appearance of the blister box.
Effect of Low Temperature on Structural Stability of Blister Boxes (Flocking)
The structure of blister boxes (flocking) also faces challenges in low temperature environments. Stress concentration may occur at the edges and corners of blister boxes due to material shrinkage at low temperatures. These parts are originally relatively weak in structure. The stress caused by low temperature may cause tiny cracks to appear. With the passage of time and further temperature changes, the cracks may expand and eventually affect the integrity of the entire blister box. For blister boxes with multi-layer structures or internal interlayers, the difference in shrinkage rate of different materials at low temperatures may destroy the bonding between layers, delaminate the structure, and reduce the protection ability of the blister box to the product.
Methods for evaluating the low temperature tolerance of Blister Boxes (Flocking)
There are many methods required to evaluate the tolerance of Blister Boxes (Flocking) to low temperature environments. Through low temperature impact tests, the blister box can be placed under different low temperature conditions (such as -20℃, -30℃, etc.), and then quickly transferred to a normal temperature environment to observe whether it breaks, deforms, or the flocking falls off. Static loading tests at low temperatures can also be performed to simulate the state of the blister box when it is stored at low temperature and under a certain pressure (such as stacking other items), and measure the maximum load it can withstand and the structural changes. In addition, long-term low-temperature exposure tests are also important. Place the blister box in a low-temperature environment for a long time, such as weeks or months, and regularly check its performance changes to comprehensively evaluate its tolerance in a low-temperature environment.
Measures to improve the low-temperature tolerance of Blister Boxes (Flocking)
To improve the tolerance of Blister Boxes (Flocking) to low-temperature environments, we can start from two aspects: material and structural design. In terms of materials, choose plastic materials with good low-temperature performance, such as some special engineering plastics, which can still maintain good toughness at low temperatures. For flocking materials and adhesives, ensure their stability at low temperatures, and improve performance by adding special additives. In terms of structural design, strengthen the weak parts of the blister box, such as increasing the thickness of the edges and corners, and using arc design to disperse stress. For blister boxes with multi-layer structures, choose materials with similar thermal expansion coefficients to reduce the delamination problem caused by temperature changes, thereby improving the quality and reliability of blister boxes in low-temperature environments.
