Since the 1960s, in order to protect environment, people began to research and develop biodegradable polymers and their products. Polylactic Acid (PLA), which was just industrialized in the late 1990s, is one of the most promising. Polylactic acid, also known as polylactide, belongs to the polyester family.
Polylactic acid is a polymer obtained by polymerizing lactic acid as the main raw material. The source of raw materials is sufficient and can be regenerated. It mainly uses corn and cassava as raw materials. The production process of polylactic acid is pollution-free, and the product can be biodegraded to realize the cycle in nature, so it is an ideal green polymer material.
Application of PLA:
The modified polylactic acid material (called "PLA modified material") has good thermal stability, and the processing temperature
170 ~ 230 ℃, good solvent resistance, can be processed in various ways, such as extrusion, spinning, biaxial stretching, injection blow molding. In addition to being biodegradable, products made of polylactic acid have good biocompatibility, gloss, transparency, hand feel and heat resistance, as well as certain bacteria resistance, flame retardancy and UV resistance, so they are very useful. Widely used as packaging materials, fibers and nonwovens, etc., it is currently mainly used in clothing (underwear, outerwear), industry (construction, agriculture, forestry, papermaking) and medical and health fields.
How to produce PLA material
The raw material of PLA non-woven fabric is polylactic acid, which belongs to the most important biodegradable and environmentally friendly polymer material in aliphatic polyester. It is made from starch raw materials proposed by renewable plant resources (such as corn, cassava, etc.). become. The production process is to saccharify starch raw materials to obtain glucose, then ferment the glucose and certain strains to produce high-purity lactic acid, and then synthesize polylactic acid with a certain molecular weight through chemical synthesis.
PLA non-woven fabrics are made of polylactic acid fibers with a skin-core structure to be carded into a net and then set by hot air. The bonding process during hot air setting is mainly divided into four stages: heat transfer, flow, diffusion and pressure cooling.
During the melting process of PLA, as the heating temperature continues to rise, a part of PLA is first melted under the action of temperature and pressure, and at the same time, with the flow and diffusion of the polymer, the fiber intersections are bonded together. After cooling, the molten polymer solidifies to form a point-like space three-dimensional bonding structure.
It can be seen that the production technology of PLA non-woven fabrics is similar to spunbond technology, but it is more complicated than spunbond technology. Equipment for PLA non-woven fabrics.
As a well-known intelligent machinery enterprise, Suntech has 50 years of design experience and technology accumulation, specializing in the production of spunbond nonwoven machines, spunmelt nonwoven machines, meltblown machines and other intelligent machinery, with 4,500 customers and 15,000 successful cases around the world.
Suntech is concerned about international environmental protection issues, and has devoted itself to researching PLA technology for many years, integrating PLA technology into the production of spunbond non-woven fabrics, collecting and researching common problems in the production of PLA non-woven fabrics, and designing equipment for these production problems at the beginning of the design.
Improvement, our PLA spunbond non woven machinery adopts Japan's leading technology, uses German Demag CNC machining center and Italian Fidia gantry five-axis high-speed milling, plus fluid polishing. The diameter of the spinneret can reach 0.45mm, the air drawing is 1-4μm, and the spinneret is fine and uniform, which can improve the utilization rate of PLA raw materials, realize the efficient and high-quality production of PLA non-woven fabrics, and ensure the filterability and breathability of non-woven fabrics. The equipment can be customized according to customer needs, welcome to inquire: https://www.suntech-machine.com/product/sms-composite-nonwoven-production-line-123.html
.png)