Plastic water bottles are widely used drinking water containers in modern life, and temperature control during transportation and storage is crucial. Temperature changes not only affect the physical and chemical properties of plastic water bottles, but may also have a significant impact on the safety of the water quality in the bottle.

Relationship between material properties and temperature
Plastic water bottles are usually made of materials such as polyethylene terephthalate (PET) and high-density polyethylene (HDPE). These materials exhibit excellent physical and chemical stability within the specified temperature range. However, when the temperature exceeds its tolerance range, the physical properties of plastics may change significantly. For example, PET may soften in an environment above 60°C, causing the bottle to deform, leak, or even break. In addition, low temperature environments will also affect the performance of plastic water bottles. Although most plastics have enhanced toughness at low temperatures, when the temperature is too low, the bottle may become brittle, increasing the risk of rupture. Therefore, it is particularly important to maintain a suitable temperature range (usually recommended between 15°C and 25°C) during transportation and storage.

Effect of temperature on water quality
Temperature not only affects the physical properties of plastic water bottles, but also directly affects the safety of the water quality in the bottle. Under high temperature conditions, the chemical composition of the water in the bottle may change, especially when the water bottle is exposed to sunlight for a long time, the ultraviolet radiation will promote the decomposition of certain chemicals in the water (such as chlorine, fluorine, etc.), thereby affecting the water quality. In addition, high temperature environments may also lead to the growth of microorganisms and increase the risk of water pollution. Relatively speaking, under low temperature conditions, the dissolved oxygen content of water is relatively high, which helps to maintain the freshness of the water quality. However, too low a temperature may cause the taste of water to change, thus affecting the consumer's drinking experience. Therefore, reasonable control of the temperature during transportation and storage can not only protect the integrity of plastic water bottles, but also ensure the safety and taste of the water quality in the bottle.

Effect of temperature on the transportation process
During transportation, temperature fluctuations may significantly affect the safety and stability of plastic water bottles. Factors such as the ventilation conditions of the transport vehicle, the stacking method of the goods, and the transportation time will affect the temperature of the water bottle. For example, in hot summer weather, the temperature inside a closed transport vehicle may rise rapidly, causing the water bottle to be affected by thermal stress during transportation. In order to reduce the impact of high temperatures on plastic water bottles, transportation companies should take effective measures, such as using transportation vehicles with temperature control systems, or regularly monitoring and adjusting the temperature during transportation. In addition, reasonably arranging transportation routes and times and avoiding long-term transportation during high temperature periods are also important strategies to ensure the safety of water bottles.