What are the materials for producing plastic water cups? PLA (Part 2)

Hello everyone, "Dong Dong Talk Cup" is here. I started by sharing the materials for producing plastic water cups. I talked about PP, PC, AS, PS, and the characteristics of PLA materials. Yesterday, due to the length of the article, I only shared part of the content. http://www.umbottle.com/ProductsDetail-IR-10067.htmlToday, I will continue to share the remaining characteristics of PLA.

What are the possible defects in the production process?

Dimensional stability: Due to the high thermal expansion coefficient of PLA, the product may shrink during the cooling process, affecting the dimensional accuracy of the product.

Yellowing: PLA products may turn yellow under high temperature or prolonged UV exposure.

Hydrolysis sensitivity: PLA may undergo hydrolysis in the presence of moisture, http://www.umbottle.com/ProductsDetail-IR-10067.htmlaffecting the performance and appearance of the product.

Finally, I would like to share my actual experience with PLA at work. Although PLA is indeed an environmentally friendly material, it actually has some problems both in production and in use. If pure PLA material is used in production, the yield rate will be very low due to shrinkage; in daily life, http://www.umbottle.com/ProductsDetail-IR-10067.htmlif pure PLA products are selected, the biggest feature of the product is that it is not durable, not as resistant to falling as traditional plastics, and not as stable in the environment as traditional plastics.

Pure PLA products are greatly affected by changes in ambient temperature and humidity. Usually, the most obvious manifestation is that they will become brittle and fall apart after a short period of use. Currently, most PLA-based products on the market are not made of pure PLA. http://www.umbottle.com/ProductsDetail-IR-10067.htmlIn order to make them more durable and stable, various merchants will add other plastic materials with different specific gravity to PLA materials, such as PP, according to the needs of the products. Therefore, many consumers who bought such products found that they did not show natural degradation after using them for a long time.

There is another misunderstanding. Some buyers and some consumers think that PLA is a material extracted from plants. Is it a recycled material or a recyclable material? PLA is not a recycled material in the traditional sense. After decomposing in the natural environment, it still needs to be extracted in the same way as new materials. The so-called recycling can only be achieved in this way. Therefore, the cost of PLA materials is relatively high. It is not what some consumers understand that since it is a recycled material, the material cost should be very low. http://www.umbottle.com/ProductsDetail-IR-10067.htmlAlthough PLA materials are expensive, difficult to produce, and have some defects in use, this type of material is of great significance. I believe that with the continuous advancement of science and technology, this type of material will be continuously optimized by professional scientific researchers to achieve reasonable use.