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Porosity Forming Technology
Porosity forming technology is a technology for
causing polymer substances to foam and develop
multiple pores. Nitto Denko has developed porosity
forming technology for a diverse range of materials.
With particularly highly developed technologies
in the areas of membrane-formation and substance
modification, Nitto Denko manufactures products
with separation and air permeation functions, such
as water treatment membranes and air filters.
The foam materials used in cars, electrical
components, and other products, which also owe
their creation to porosity-forming technology,
have functions such as cushioning, waterproofing,
and sealing.
Separation Membrane Technology
The manufacturing methods for ultrafiltration (UF) membranes, microfiltration (MF) membranes, and other polymer separation membranes include approaches based on phase separation, orientation, and etching. Nitto Denko manufactures polysulfone UF membranes through a type of phase separation known as non-solvent-induced phase separation (NIPS). As illustrated in the diagram below, phase separation occurs when a non-solvent is used to set a membrane-forming solution of polysulfone and a solvent, causing the formation of a multiporous structure.
Foaming Technology
When subjected to foaming, polymers can be endowed
with a wide range of properties and functions,
including flexibility, shock absorption, heat
insulation, soundproofing and soundblocking, and
light weight. Normally, a range of foaming agents
is used and foaming is performed by introducing
gas mechanically or by chemical decomposition
of a foaming agent.
By altering the foaming agent and
the foaming method, it is possible to control
the size and volume of the air bubbles and also
the structure.
Fluoroplastic Porous Film Technology
Fluoroplastics (e.g. PTFE), which are the raw
material of multiporous substances, are characterized
by ready fibrinization, with application of a
small amount of shear stress sufficient to cause
formation of fibrils (slender fibers). When these
fibers coalesce and intertwine, a multiporous
structure (membrane) is formed.
Normally, fluoroplastic multiporous
membranes are formed using a method known as orientation
to allow cleaving and drawing of fibers. One technology
for creating pores from fibers is biaxial orientation
of the fluoroplastic in the longitudinal and latitudinal
directions at a high rate of magnification, which
allows precise creation of pores in the microscopic
fibers.
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