PLA（聚乳酸）是一種生物可分解塑料，其特性受到溫度的影響。一般而言，當PLA達到其玻璃轉移溫度（Glass Transition Temperature，縮寫為Tg）時，它的物理性質會發生改變。
PLA的玻璃轉移溫度約在攝氏55至60度之間。在這個溫度範圍內，PLA可能會變得較軟且容易變形，也可能開始釋放或排除吸收的水分。因此，當PLA暴露在高於其玻璃轉移溫度的環境中，可能會開始釋放水分。
值得注意的是，PLA的生物可分解性質意味著它會在特定條件下分解，而水分的存在可能會加速這個過程。因此，PLA在高溫環境中可能會在一定程度上釋放吸收的水分，進而影響其性質和分解速度。
當空氣溫度升高時，空氣中的水蒸氣分子的平均動能也會增加，這使得水蒸氣分子更容易從液態水或濕地表面脫離，進入空氣中。
因此，空氣中的水蒸氣含量會增加，相對濕度就會降低 1. 空氣中的水蒸氣含量與溫度有關，當空氣溫度升高時，空氣中可以容納更多的水蒸氣，因此相對濕度就會降低.
這是因為空氣中的水蒸氣分子的平均動能增加，使得水蒸氣分子更容易從液態水或濕地表面脫離，進入空氣中1. 當空氣溫度降低時，空氣中的水蒸氣分子的平均動能也會降低，這使得水蒸氣分子更容易凝結成液態水或固態冰，因此相對濕度就會升高
3D列印線材烘乾機需要有濕氣排出口，是因為3D列印線材具有吸濕性。當線材受潮時，其內部的水分會對列印產生負面影響，例如列印失敗、表面不平滑等。因此，烘乾機需要有濕氣排出口，以排出線材中的濕氣，保持線材的乾燥狀態，從而確保列印的成功率和品質
In a hotter environment, the relative humidity decreases, which means the air can hold less moisture. This can cause the moisture in the PLA filament to evaporate, effectively drying the filament. However, it’s important to remember that PLA has a low glass transition temperature, so the heat should not be so high that it causes the filament to soften or melt. For this reason, it’s often recommended to store PLA filament in a dry, cool place, and use desiccants to absorb any excess moisture.
Water does indeed boil and turn into vapor at 100°C (212°F) at standard atmospheric pressure1. However, evaporation is a surface phenomenon that can occur at any temperature2.
At 40 degrees Celsius, water can still evaporate. The rate of evaporation depends on factors like temperature, humidity, and air movement1. Even though the average kinetic energy of water molecules is less than what’s needed to evaporate, there are always some molecules with enough energy to escape and turn into vapor2.
So, in the context of PLA filament, if the environment is 40 degrees Celsius, the moisture absorbed in the filament can still evaporate, helping to dry the filament. However, it’s important to remember that direct heat can potentially damage the filament, so it’s generally recommended to store PLA filament in a cool, dry place and use desiccants to absorb any excess moisture.
PLA (Polylactic Acid) is a hygroscopic material, which means it absorbs water from the air1. When PLA filament absorbs moisture, it can lead to uneven and messy prints. As the printer melts the material, the water evaporates, creating small bubbles in the plastic12.
Heating up the space where PLA is stored can help reduce its moisture content. This is because heating the air reduces its relative humidity, making it less likely for the PLA to absorb moisture from the air. Moreover, if a moisture-laden filament runs into the heating element of your extruder, the entrapped moisture will expand and eventually turn into steam2. This process is often characterized by a popping and hissing sound, indicating that the filament needs to be dried2.
However, it’s important to note that PLA has a relatively low glass transition temperature of only 60-65°C12. This means that a filament roll exposed to temperatures around this value has a tendency to soften and fuse, making it unusable2. Therefore, any method that does not rely on direct heat application is preferable2.
For long-term storage, it’s recommended to keep your PLA filament in an airtight container, preferably with some desiccant, to keep them from picking up moisture from the environment2. This is the most effective way to ensure that your PLA filament stays dry and ready for your next 3D printing project2.
