Top Compostable Plastic Manufacturers : Factory Guide

Guanzhong: Industry-Leading Expertise in Compostable Plastic Manufacturing

Guanzhong is a leading compostable plastic manufacturers in China, providing high-quality, eco-friendly solutions for global clients with advanced technology, full-process production capabilities, and extensive customization experience.

• Comprehensive Production Strength: The company is located on Dongping Light Industry Avenue, Yongchun County, Quanzhou, Fujian Province. Its industrial park covers nearly 200,000 square meters, with over 100,000 square meters of standardized factory space. The campus includes an independent R&D center, testing laboratories, and fully automated production lines, covering raw material production, film extrusion, printing, and bag-making processes.
• High Production Capacity: Guanzhong operates 50 film extrusion lines and 25 bag-making lines, with 180 professional production staff and an annual output of 90,000 tons. This large-scale production ensures a stable supply of household and commercial compostable bags and supports timely delivery of bulk orders.
• International Certifications and Market Recognition: Guanzhong’s compostable bags have passed EN 13432, ASTM D6400, BPI, DIN CERTCO, GB/T 19277.1 certifications, meeting compliance requirements for global markets. High-quality products and reliable services make Guanzhong a long-term partner for international brands and supermarkets.
• Full Range of Customization: Guanzhong supports material, size, color, printing, and packaging customization, flexibly adjusting formulas and processes to meet client needs. This gives Guanzhong a significant competitive advantage among compostable bag factory and compostable plastic manufacturers worldwide.

PLA + PBAT Modified Materials: Guanzhong’s Formulation Advantages and Scientific Basis

The core material of Guanzhong’s compostable bags is PLA (polylactic acid) combined with PBAT (polybutylene adipate-co-terephthalate), scientifically formulated to achieve an optimal balance of performance and biodegradability.

Scientific Basis for a Fully Biodegradable System

PLA is derived from natural starch sources such as corn and cassava, fermented into lactic acid and polymerized into polylactic acid, a 100% renewable bio-based resin. PBAT is a fully biodegradable aliphatic-aromatic copolyester with excellent flexibility. Guanzhong uses compatibilizers and blending techniques to ensure complete biodegradability under industrial composting conditions while maintaining non-toxic, odorless, and safe properties, meeting EN13432 and ASTM D6400 standards.

Proprietary Modification Technology to Enhance Material Performance

PLA is inherently brittle with limited tensile strength, while PBAT is highly flexible but more costly. Guanzhong applies proprietary modification technologies to improve PLA-PBAT compatibility, optimize crystal structure and rheological properties, and enhance film tear resistance, tensile strength, and low-temperature flexibility, ensuring reliable sealing performance during use.

Stable and Controllable Material Properties

Strict control is applied to raw material selection, blending, extrusion, and film formation. Each batch undergoes tensile strength, elongation, and thickness uniformity testing. Data show the material elongation at break exceeds 300%, with tensile strength between 12–18MPa, maintaining flexibility and durability even in low-temperature environments and reducing bag breakage risk.

Inside Guanzhong Factory: Production and Quality Overview of Compostable Trash Bags

Guanzhong integrates R&D, production, and testing in one factory, with a fully automated production system ensuring consistent quality and reliability of every batch of compostable trash bags.

1. Full-Process Production Equipment and Capacity

The factory is equipped with 50 fully automatic film extrusion lines and 25 bag-making lines. The extrusion workshop produces PLA+PBAT films with uniform thickness and high tensile strength, with a monthly capacity of 1,500 tons. The bag-making workshop supports vest bags, flat bags, and roll bags with high sealing strength. Raw material production includes 8 modified bio-based masterbatch lines, with a monthly output of 2,000 tons, ensuring stable raw material supply.

2. Quality Control System

Guanzhong has established a comprehensive quality control system covering raw materials and finished products. Raw materials undergo testing for bio-based content and degradability to comply with ASTM D6866 and EN13432 standards. Film tensile properties, elongation, and puncture resistance are tested, and bag sealing strength and thickness uniformity are digitally monitored. Each batch undergoes composting degradation tests to ensure complete degradation under industrial composting conditions.

Guanzhong Customization Services

Guanzhong provides professional customization services for global clients, allowing flexible adjustments in materials, dimensions, printing, and packaging to meet various application needs.

1. Supported Customization Options

• Material Customization: Multiple PLA+PBAT formulations are available, including high-flexibility and tear-resistant options. Modifications can balance tensile strength, toughness, and biodegradability for specific usage scenarios.
• Size and Specification Customization: Supports household, commercial, kitchen, and pet waste bags, with adjustable lengths, widths, and thicknesses for vest bags, roll bags, and flat bags.
• Color and Printing Customization: Eco-friendly water-based inks allow full-color or single/multi-color printing, including logos and patterns. Printing is clear, scratch-resistant, and does not affect compostability.
• Packaging Customization: Options include OPP single packs, PE multi-packs, roll bundles with or without cores, and customized outer cartons for distribution and retail needs.

2. Minimum Order and Delivery Time

Minimum order for customized products is 1 ton of raw material, sample delivery in 3–7 days, and bulk production in 10–20 days, enabling rapid product verification and mass production.

Guanzhong Technology and Production Advantages

Guanzhong relies on a complete R&D, production, and quality control system, making it a trusted compostable plastic manufacturers for clients worldwide.

• Self-Produced Raw Materials Ensuring Stable Quality: Guanzhong produces its PLA+PBAT masterbatch, adjusting formulations to achieve optimal balance between strength, toughness, and compostability, reducing costs and shortening the supply chain.
• Large-Scale Production Capacity: With 50 fully automated extrusion lines and 25 bag-making lines, monthly production exceeds 1,500 tons, supporting both household and commercial orders while ensuring delivery efficiency and product consistency.
• Comprehensive International Certifications: All compostable bags meet EN 13432, ASTM D6400, BPI, DIN CERTCO, GB/T 19277.1, and other certifications, satisfying regulatory requirements in major global markets, making Guanzhong a long-term partner for international brands and supermarkets.
• Strict Quality Control System: A digital monitoring system tracks raw materials, films, bag-making, and finished products. Each batch undergoes testing for tensile strength, thickness uniformity, sealing performance, and degradation, ensuring stability and reliability during transport and use.
• Extensive Global Supply Experience: Guanzhong has long supplied compostable trash bags to international clients, including supermarket chains, municipal projects, and bag brands, providing rapid response and high-performance custom solutions.

Choosing a professional and reliable compostable bag factory is critical for corporate environmental image and product quality. Guanzhong leverages advanced PLA+PBAT modified materials, a complete production system, strict quality control, and flexible customization to provide high-performance, fully biodegradable trash bags for global clients. Whether for household, commercial, or specialized needs, Guanzhong delivers stable, compliant, and reliable products, supporting sustainable development goals.

Collaborating with Guanzhong not only ensures premium products but also adds long-term value in environmental commitment, market competitiveness, and customer trust. Choosing compostable trash bags is both an investment in environmental responsibility and future business growth.