Spunbond

 

 

Spunbond fabrics are produced by depositing extruded, spun filaments onto a collecting belt in a uniform random manner followed by bonding the fibers. Bonding imparts strength and integrity to the web by applying Calendering process (= uses heat and high pressure applied through rollers to weld the fibre webs together at speed).

Since the fabric production is combined with fiber production, the process is generally more comfortable than when using staple fiber to make nonwoven fabrics.

Spunbonding Process

The spunbond process consists of the following integrated operations:

  • Polymer melting, transport and filtration of polymer melt
  • Filament extrusion
  • Filament drawing
  • Filament deposition
  • Bonding

Flowchart of Spunbonding Process

 

Some Frequent Ask Question (FAQ) regarding Nonwoven product

1. Q: What's the main difference between a textile, paper, film and a nonwoven product?
A: Textiles are either woven or knitted, and one needs a yarn to manufacture either one of them. For the textile industry, yarns constitute its main raw material.

The nonwoven industry works with natural and man-made fibers/filament, without the need to first spin yarns from them. Fibers/filaments are consolidated directly into fabrics or formed products through the use of one or a combination of several technologies, none of which involve weaving or knitting.

2. Q: How many kind of nonwoven?
A: There are many kind of nonwoven product. Descriptive subclasses of nonwoven fabrics have been derived from the method of web formation, web consolidation, formation/consolidation or end-use application.

Web formation groupings include

  • meltblown
  • cast film
  • spunbond
  • airlaid
  • chemicalbond
  • thermobond

Why PP spunbond has to break down under UV sunlight.

Ultraviolet light causes the oxidation process as a natural “aging” process, the oxidation is a process in which “free radicals” are generated in the process and the polypropylene chains are broken into smaller pieces.

In some certain application which need “longer live time” will need uv stabilizer process because unstabilized polypropylene is rapidly degraded by UV light. So sometimes improved stabilizers (by adding UV stabilizer) permit several years of outdoor exposure before fiber properties deteriorate.



PP Degradable



Condition after 2 weeks