What are the characteristics of polypropylene hollow filament?

polypropylene hollow filament is a special polypropylene fiber product with the following characteristics and applications:

Features:

Hollow structure: The fiber has a hollow channel inside, which makes the polypropylene hollow filament lighter than ordinary polypropylene filament, can provide better thermal performance and buoyancy, but also increases the surface area of the fiber, so that it has better adsorption and permeability.

Light weight: polypropylene itself is the least dense of all common synthetic fibers, and polypropylene hollow fibers further reduce the weight due to the hollow structure, so that it can obtain greater volume or coverage area under the same weight.

Good heat preservation: the hollow structure can store a lot of still air, and the thermal conductivity of still air is low, so it can effectively prevent the transfer of heat, provide good thermal effect, suitable for making warm clothing, bedding and so on.

High buoyancy: because of its light weight and hollow, it can produce large buoyancy in the water, and is often used in the production of water life-saving equipment, swimming supplies, such as life jackets, swimming rings, etc.

Good resilience: It has good resilience, can be quickly restored to the original state after being extruded or stretched by external force, and is not easy to deform, which makes the products made of polypropylene hollow wire have better durability and shape retention.

Easy dyeing: Like ordinary polypropylene filament, polypropylene hollow filament also has good dyeing performance, and can obtain rich colors through a variety of dyeing methods to meet the color needs of different products.

Production process:

Raw material preparation: Use high-quality polypropylene resin as the main raw material, and according to the performance requirements and special needs of the product, some additives may be added, such as antioxidants, antistatic agents, lubricants, etc.

Melt spinning: polypropylene resin is heated to a molten state (usually between 200-300 ° C) to form a uniform melt. Then, through a specially designed spinneret, the melt is extruded to form a thin stream of fibers with a hollow structure. The shape and size of the spinneret hole on the spinneret determine the hollow structure and outer diameter of the fiber.

Cooling and curing: The fiber extruded from the spinneret hole is filtered into the cooling area, usually by air cooling or water cooling, so that the fiber is quickly cooled and solidified to form a solid hollow fiber. The cooling speed and cooling conditions have important effects on the structure and properties of the fibers, which need to be accurately controlled.

Tensile: The fiber after cooling and curing needs to be stretched to improve the strength and orientation of the fiber. Stretching is usually carried out in multiple stages, through different stretching multiples and speeds, to make the molecular chains of the fiber more orderly along the axis, thereby improving the strength and other properties of the fiber. During the drawing process, parameters such as temperature, drawing multiple and speed need to be controlled to ensure the quality of the fiber is stable.

Heat setting: the fiber after stretching is heat setting treatment, under certain temperature and time conditions, the structure of the fiber is more stable, the internal stress is eliminated, and the dimensional stability and heat resistance of the fiber are improved. The temperature and time of heat setting need to be optimized according to the variety and performance requirements of the fiber.

Winding: The polypropylene hollow filament after heat setting treatment is wound into a cylinder or other shape by the winding equipment, so as to facilitate storage, transportation and subsequent processing. The winding speed and tension need to be controlled within the appropriate range to ensure that the quality of the winding fiber is uniform, no loose, winding and other problems.

Shanghai Jinci Industrial Co., LTD., founded in March 2006, is a large entity company specializing in the production and sales of polypropylene yarn (PP yarn). The company's products include polypropylene general strong yarn, polypropylene high strength yarn, polypropylene light body yarn, polypropylene twist yarn, polypropylene hollow yarn, polypropylene fluorescent silk, polypropylene luminous silk, polypropylene flame retardant silk, polypropylene air yarn and so on.