Polypropylene Spunbond Nonwoven Fabric China Suppliers Spunbond
Fabric
1. INTRODUCTION
It is similar to filament yarn production. From the chips storage,
the polymer is vacuum-fed to a dosing station on top of the
extruder. Inside the extruder, it becomes melted and homogenized.
Passing a filter system and a spin pump, the melt is fed into the
spin beam or spinnerets, which form a curtain of filaments. The
filaments are cooled by means of a stream of air in a blowing area,
drawn by aerodynamic forces and then transported to the downstream
discharge channel. For nonwovens, instead of a further stretching
process for filament yarns, the filaments are swirled around and
then deposited on the wire mesh belt as a random nonwoven. This web
is transferred to a bonding calender that uses heat and pressure to
set such physical properties as tensile strength and elongation of
the final product. After cooling, the material can be wound.
2. APPLICATIONS
Spunbonds are used mainly for hygiene products such as baby and
adult diapers, feminine care, and medical products such as
protective apparel. Spunbonds also are used more and more in
technical applications. These are used mainly for construction,
coating substrates, agriculture, battery separators or even disk
covers.
I) Sanitary and medical
The use of spunbond web as a coverstock for diapers and
incontinence devices has grown dramatically in the past decade.
This is mainly because of the unique structure of spunbond, which
helps the skin of the user stay dry and comfortable. Additionally,
spunbond webs are cost effective over other conventional nonwovens.
Spunbond web, as coverstock, is also widely used in sanitary
napkins and to a limited extent in tampons.
In medical applications many traditional materials have been
replaced by high performance spunbonded webs. The particular
properties of spunbonded webs, which are responsible for medical
use, are: Breathability; Resistance to fluid penetration; Lint free
structure; Sterilizability; And, impermeability to bacteria.
Medical applications include: Disposable operating room gowns, shoe
covers and sterilizable packaging.
Ii) Packaging
Spunbonded fabrics are widely used as packaging material where
paper products and plastic films are not satisfactory. The examples
include: Metal-core wrap, medical sterile packaging, floppy disk
liners, high performance envelopes and stationery products
