非织造材料与工程专业英语词汇（O）——非织造论坛整理发布，第一无纺布网！

非织造材料与工程专业英语词汇（O）——非织造论坛整理发布，第一无纺布网！

O

Olefin fibre
A manufactured fibre in which the fibre forming substance is any long chain synthetic polymer composed of at least 85% by weight of ethylene, propylene, or other olefin units. Olefin fibres combine light weight with high strength and abrasion resistance (see also POLYETHYLENE and POLYPROPYLENE).

Opening
A preliminary operation whereby staple fibre is separated sufficiently from its lap and tufted condition so that it can be fed to the web forming part of the process.

Optical brightener
A colourless compound that lends a whiteness to a fabric. It does this by absorbing the ultraviolet component of light and emitting it as visible light.

Orientation
The lining up or parallelism of molecular chains in fibres and films.

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