What Is The Difference Between Degradable Packaging Bags And Fully Degradable Packaging Bags?

2024-05-20

Author : wing Update Time：May 20 , 2024

【 Abstract 】 :

Degradable packaging bag, the implication is that it can be degraded, but the degradable packaging bag is divided into "degradable" and "fully degradable" two kinds.

Degradable packaging bag refers to the addition of a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biological degraders, etc.) in the production process, so that its stability is reduced, and then it is easier to degrade in the natural environment.

Fully degradable packaging bag means that the plastic packaging bag is completely degraded into water and carbon dioxide. The main source of this completely degradable material is processed from corn, cassava, etc. into lactic acid, that is, PLA. Polylactic acid (PLA) is a new kind of biosubstrate and renewable biodegradable material. Starch raw materials through saccharification to obtain glucose, and then from glucose and a certain strain fermentation to produce high purity lactic acid, and then through chemical synthesis method to synthesize a certain molecular weight of polylactic acid. It has good biodegradability, and can be completely degraded by microorganisms in nature under specific conditions after use, and eventually generate carbon dioxide and water, without polluting the environment. This is very good for protecting the environment and is an environmentally friendly material for workers.

At present, the main bio-based material of the fully degradable packaging bag is composed of PLA+PBAT, which can be completely decomposed into water and carbon dioxide in the case of composting (60-70 degrees) in 3-6 months, which is pollution-free to the environment.

Why add PBAT? Professional flexible packaging manufacturer Goolien packaging tells you here: PBAT is a copolymer of adipic acid, 1, 4-butanediol and terephthalic acid, which is an aliphatic - aromatic polymer that can be fully biodegradable chemically. PBAT has excellent flexibility and can be used for film extrusion, blowing processing, extrusion coating and other molding processing. The purpose of blending PLA and PBAT is to improve the toughness, biodegradation and molding performance of PLA. PLA and PBAT are incompatible, so the performance of PLA can be significantly improved by selecting suitable compatibilizers.