Biodegradable plastic bag manufacturers take you closer to biodegradable plastic bags

Biodegradable plastic bags refer to those made from materials that can be degraded by the interaction of microorganisms in nature, such as bacteria, fungi, and algae. Biodegradable plastic bags can be almost completely decomposed by environmental microorganisms, turning into carbon dioxide and water or methane and water after decomposition. The products of biodegradable plastic bags after degradation can participate in the carbon and nitrogen cycles in nature. Carbon and nitrogen elements not only form the basic framework of organisms but also enable biological metabolism through their own biochemical reactions. Therefore, the material of biodegradable plastic bags is an environmentally friendly material.

Biodegradable Types of plastic bag materials

PLA : Polylactic acid, a polymer obtained by polymerization with lactic acid as the main raw material, is a new type of bio-based and renewable biodegradable material. It has good solvent resistance, biocompatibility, gloss, transparency, and also certain antibacterial, flame retardant, and UV resistance properties.

Disadvantages: low elongation at break, excessively high modulus, low heat distortion temperature, easy water absorption, brittle.

PBAT : A copolymer of adipic acid butylene glycol ester and terephthalic acid butylene glycol ester, belonging to thermoplastic biodegradable plastics. It has good ductility and elongation at break, as well as good impact resistance; in addition, it has excellent biodegradability and is one of the very active degradable materials in the research of biodegradable plastic bag materials.

Disadvantages: low heat distortion temperature, low transparency, low strength.

PBS : Polybutylene succinate, a thermoplastic biodegradable plastic. Compared with other biodegradable plastics, PBS has good heat resistance, with a heat distortion temperature close to 100℃. After modification, the service temperature is close to 100℃. It can be processed into various shapes on existing general plastic processing equipment, and can also be blended with a large amount of fillers such as calcium carbonate and starch to reduce material costs. In addition, PBS only degrades when exposed to specific microorganisms in conditions such as compost or water bodies, and its performance is very stable during normal storage and use.

Disadvantages: easy to age, easy to degrade.

PCL : Poly-ε-caprolactone (PCL) is a low-melting-point polymer obtained by ring-opening polymerization of ε-caprolactone, with a melting point of only 62℃. Research on PCL degradation began in 1976, and PCL can be completely decomposed by microorganisms in both anaerobic and aerobic environments.

Disadvantages - low heat distortion temperature, low melting point.

PPC : Also known as poly(propylene carbonate), it is a completely degradable environmentally friendly plastic synthesized from carbon dioxide and propylene oxide as raw materials.

Disadvantages: low heat distortion temperature.

PHA : PHA is an aliphatic copolyester of different structures synthesized by microorganisms through fermentation of various carbon sources.

Disadvantages: low transparency.

PGA : Polyglycolide (also known as polyhydroxyacetic acid, polyglycolic acid), is a highly crystalline, biodegradable aliphatic polymer with a fast degradation rate, primarily used in fields such as surgical sutures.

Disadvantages: low elongation at break, excessively high modulus, easy water absorption, brittle.

Degradation methods

Biodegradable plastic bag materials can be classified according to their degradation methods into:

one category is completely biodegradable materials, and the other is destructive biodegradable materials.

Completely biodegradable materials refer to materials that, under natural environmental conditions, can be fully biodegraded by microorganisms such as bacteria, fungi, and algae after disposal, ultimately producing carbon dioxide and water, without generating pollutants, causing no harm to the environment, not affecting human healthy living, and playing a positive role in environmental protection.

They are mainly made from natural high molecular compounds such as starch, cellulose, or agricultural by-products through microbial fermentation or synthesis of biodegradable polymers, such as aliphatic polyesters. PLA, PHA, PBAT, PBS starch, etc., all belong to this category of materials. They exhibit stable performance during use, possess good biocompatibility and bioabsorbability, are environmentally friendly, and offer an excellent solution for eradicating "white pollution" caused by traditional plastics. Their decomposition is primarily due to the rapid growth of microorganisms leading to the physical degradation of the material.

Biodegradable materials are widely used in various industries and can partially replace general-purpose plastics. Environmentally friendly materials, packaging materials, and medical materials are used in larger quantities.

Food bags, packaging bags, and garbage bags made from biodegradable materials are highly favored due to their biodegradability. Biodegradable packaging materials typically involve adding degradable high molecular polymers to laminated films or directly blending them with laminating materials to form films. Food packaging materials and containers generally require ensuring food does not rot, isolating oxygen, and the material is non-toxic. Among them, the most representative are polyhydroxybutyrate ( PHB) and polyhydroxyvalerate (PHV) and their copolymers. Their physical properties are similar to those of polyethylene and polypropylene, and they have good heat-sealing properties. After use, they can be biodegraded or incinerated. The oxygen consumption of both is equivalent to the oxygen released into the atmosphere by their photosynthesis, and the CO2 produced after treatment is the total amount of CO2 absorbed by photosynthesis, thus they can be considered to fully enter the biological cycle.

Destructive biodegradable materials are also called incomplete degradation materials or semi-degradation materials. Most of them are produced by blending additives with polyethylene and polystyrene, or by blending starch and cellulose with general-purpose plastics. Their shortcomings are insufficient mechanical strength, inability to completely replace traditional plastics; not complete degradation, easily causing secondary pollution. Their decomposition is mainly due to the destruction of additives and weakening of polymer chains, reducing the polymer molecular weight to a level that microorganisms can digest.

Dongguan Shunxingyuan Packaging Products Co., Ltd. has been specializing in the packaging industry for 19 years, possessing strong R&D, design, and production capabilities. Focusing on expertise, the company has adhered to the principle of "mutual cooperation, mutual benefit, and common development" since its establishment, continuously striving for excellence and leading the flexible packaging industry. We specialize in producing various types of plastic bags for the apparel, food, chemical, home gifts, electronics, and other industries. Furthermore, Dongguan Shunxingyuan Packaging Products Co., Ltd. invests heavily in product R&D each year, having applied for numerous patents. The company also places great importance on internal production process optimization, employee training, and enhancing core competitiveness. Dongguan Shunxingyuan Packaging Products Co., Ltd.'s clients are located in many countries around the world, with renowned brands such as ADIDAS, AAPE, IZZUE, I.T, Calvin Klein, LIBERTY, Tarte, and LEE as key partners.

List of Shunxingyuan's Clients

In the field of biodegradable plastic bags, Shunxingyuan Packaging has established a mature production line for biodegradable plastic bags, including specialized bio-degradable raw material film blowing machines, printing machines, cutting machines, waste recycling granulation machines, and various other equipment. Products include vest bags, garbage bags, handle bags, garment bags, hardware bags, cosmetic bags, food bags, header bags, kraft paper /PLA composite bags, etc. The products are of stable quality, high production efficiency, exquisite printing, moisture-proof, puncture-resistant, non-toxic, well-sealed, good tensile strength, good texture, and environmentally friendly.

The biodegradable plastic bags of Dongguan Shunxingyuan Packaging Products Co., Ltd. have undergone multiple inspections and boast rich production experience, enabling high-efficiency production while ensuring high quality. Simultaneously, Shunxingyuan Packaging has also achieved remarkable results in the fields of recycled and recyclable packaging bags and biodegradable packaging bags, having obtained GRS and D2W international certifications. Choose Shunxingyuan Packaging for your biodegradable packaging bag orders!

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