Why Is The Granulation Of Bamboo Plastic Materials So Popular Recently?
1, Policy and Market Resonance: Why is Bamboo Plastic Material Granulation Ignited at This Time
The global plastic pollution control has entered the stage of quantitative constraints. The United Nations Environment Programme (UNEP) stated in its 2023 report "Cutting the Roots: How the World Can End Plastic Pollution" that approximately 400 million tons of plastic waste are generated globally each year, of which only about 9% are recycled. At the same time, joint data from the European Bioplastics Association and nova Institute shows that the global bioplastic production capacity will be approximately 2.18 million tons in 2023, and is expected to increase to 7.43 million tons by 2028, with a particularly significant growth rate for biodegradable materials filled with natural plant fibers.
The Chinese initiative of "replacing plastic with bamboo" has further amplified the raw material advantages of bamboo plastic granulation. The bamboo forest area in China exceeds 7 million hectares, and the annual output value of the bamboo industry exceeds 400 billion yuan. The source of bamboo fiber is stable and the cost is controllable. Composite granulation of bamboo powder and bamboo fiber with biodegradable materials such as polypropylene (PP), polyethylene (PE), polylactic acid (PLA), PBAT, etc. can not only reduce the amount of pure resin used, but also improve the rigidity, heat resistance, and biodegradability of the materials. Therefore, the rapid rise of bamboo plastic material granulation in the plastic granulation market is essentially the result of the combination of environmental compliance pressure and cost reduction demand.
2, Technical core: How to solve the difficulty of bamboo plastic material granulation with co rotating twin-screw extruder
Granulation of bamboo plastic materials is not simply mixing bamboo powder and resin. Bamboo fiber has the characteristics of high aspect ratio, surface polarity, large fluctuations in moisture content, and poor thermal stability. In traditional single screw extrusion equipment, it is prone to agglomeration, bridging, degradation yellowing, and uneven pore size. This is also the main reason why bamboo plastic composite materials have long been stuck in low-end boards and difficult to enter precision plastic granulation systems.
The reason why the co rotating twin-screw extruder has become the mainstream equipment for bamboo plastic material granulation is that its modular screw combination can simultaneously complete dispersion mixing and distribution mixing. The high torque transmission box and precise temperature control system can control the shear heat below the degradation temperature of bamboo fibers; Multi stage vacuum exhaust can reduce the moisture content of materials to below 0.5%, avoiding hydrolysis and bubble defects during extrusion process; The side feeding device supports stable feeding of up to 50% -60% bamboo powder mass fraction. For biodegradable material systems such as PLA and PBAT, co rotating twin-screw extruders can also reduce the melt residence time and protect the melt strength by adjusting the aspect ratio and thread element combination, thereby stabilizing the melt index and particle appearance of biodegradable plastic granulation.
3, Application scope of bamboo plastic granulation in biodegradable materials
The particles produced by granulation of bamboo plastic materials are not a single category, but functional masterbatch or modified particles that can be designed according to terminal needs. At present, the main applications are concentrated in the following directions:
1. Disposable catering packaging and tableware: The bamboo powder filled PLA/PBAT system can replace some pure biodegradable resins, reducing raw material costs while meeting the requirements for biodegradable material molding. It is suitable for injection molded or vacuum formed products such as knives, forks, lunch boxes, cup lids, etc.
2. Agricultural and forestry film and seedling container: Bamboo plastic composite particles can improve the stiffness and tear resistance of the film, while maintaining the degradation trend under soil contact conditions and reducing traditional film residue.
3. 3D printing wire and daily necessities: Bamboo fiber filled PLA wire has a similar appearance to natural wood and small printing warpage, making it a popular choice for desktop biodegradable materials.
4. Automotive interior and architectural templates: Bamboo plastic particles are used for lightweight components such as door panels, dashboard frames, decorative strips, etc., which can reduce the amount of plastic used in the entire vehicle while meeting environmental requirements such as odor and VOC.
5. Logistics pallets and durable packaging: PP/PE particles with high bamboo powder content combine rigidity, toughness, and weather resistance, making them suitable for industrial packaging scenarios such as reusable pallets and pallet boxes.
4, The engineering value of the COLOWE co rotating twin-screw extruder in the granulation of bamboo plastic materials
International customers who are new to bamboo plastic material granulation often worry about three issues: whether the formula can be scaled up, whether the equipment is stable, and whether energy consumption and yield are controllable. The co rotating twin-screw extruder series of Nanjing Kelongwell Chemical Machinery Co., Ltd. has strong adaptability in these aspects.
The COLOWE co rotating twin-screw extruder adopts a modular cylinder and threaded component design. Customers can start from experimental equipment to verify the proportion of bamboo powder, lubrication system, type of compatibilizer, and processing temperature window, and then switch to larger production lines to reduce trial and error costs. The equipment is equipped with a high torque gearbox, multiple temperature control zones, dual vacuum exhaust, and weight loss side feeding system, suitable for plastic granulation of bamboo powder, starch, bamboo fiber, and various biodegradable materials. Based on actual project experience, after optimizing the screw combination reasonably, the ton power consumption of bamboo plastic material granulation can be reduced by about 12% -18%, and the particle moisture content can be stabilized between 0.3% -0.6%, meeting the requirements for particle consistency in subsequent injection molding or blown film.
For customers who are making new materials for the first time, COLOWE can also provide process parameter packages in both Chinese and English, screw configuration suggestions, and on-site debugging support to help customers complete the process from formula development to stable mass production in a shorter period of time.
5, Key Questions and Answers
Q: Is it better to add a higher amount of bamboo powder?
A: No. In conventional PP/PE systems, the mass fraction of bamboo powder is usually controlled between 20% and 60%; In biodegradable materials such as PLA/PBAT, it is recommended to control it at 20% -40%. Excessive bamboo powder content can lead to a decrease in melt strength, fluctuations in extrusion pressure, and rough particle surfaces, which require the side feeding and exhaust capabilities of the co rotating twin-screw extruder to maintain stability.
Q: Why not use a single screw for granulation of bamboo plastic materials?
A: The shear and exhaust capacity of a single screw is limited, making it difficult to achieve uniform dispersion and deep dehydration of bamboo fibers. The co rotating twin-screw extruder can effectively control the dispersion, volatilization, and temperature rise of bamboo plastic material granulation through a modular thread combination and dual vacuum exhaust, especially suitable for systems with narrow processing windows for biodegradable materials.
Q: How to control the temperature when composite granulation of biodegradable materials and bamboo powder?
A: Degradable materials such as PLA and PBAT are sensitive to temperature and shear, and the processing temperature is generally controlled within the range of 160-190 ℃, adjusted according to the melting point of the resin and the moisture content of bamboo powder. The co rotating twin-screw extruder requires precise zone temperature control and low shear combination to avoid local overheating leading to degradation, yellowing, or molecular chain breakage.
Q: How to reduce the cost of trial and error when trying bamboo plastic material granulation for the first time?
A: It is recommended to start with a small-scale experimental line of modular co rotating twin-screw extruders, verify the formula and process window first, and then increase production capacity. Nanjing Kelongwell Chemical Machinery Co., Ltd. can provide process validation, screw configuration optimization, and operation training for bamboo plastic material granulation, helping customers reduce raw material waste and downtime.
The popularity of bamboo plastic material granulation is not a short-term concept hype, but an industrial change driven by global plastic restrictions, cost substitution, and advances in twin-screw extrusion granulation technology. For international customers who wish to enter the biodegradable materials market and maintain high cost-effectiveness, choosing a co rotating twin-screw extruder that is compatible with bamboo plastic material granulation technology is a key step in opening up the market and reducing risks. The complete solution provided by Nanjing Kelongwell Chemical Machinery Co., Ltd. in this field is helping more customers convert bamboo resources into stable and replicable plastic granulation capacity.
