Ball-like structures and contacting materials for wastewater-treatment
AssigneesKureha Kagaku Kogyo Kabushiki, Kureha Gosen Kabushiki Kaisha
InventorsHisaaki Ueba, Yosio Sunaga, Tosio Nagasima
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Abstract
Disclosure describes ball-like structures formed from bundled, crimped fibers rounded around a central portion thereof as a core, the core being formed with a molten-fused structure and having the following stipulations: (a) a density of the molten-fused structure is not less than 75% based on a density of the crimped fibers forming the ball-like structures. (b) a length of the molten-fused structure is 5 to 50% based on a diameter of the ball-like structures, and (c) a withdrawing strength of a crimped fiber strand connected with the molten-fused structure is not less than 50% based on a linear strength of the crimped fiber strand itself used for the ball-like structures.
Claims4
Ball structures formed from bundled, crimped fibers rounded around a central portion thereof as a core, the core being formed from molten-fused fibers and having the following characteristics:
- (a) a ratio of the specific gravity of the molten-fused fibers forming the ball structures divided by the specific gravity of the material that forms the fibers, expressed as a percentage, of at least 75%,
- (b) a length of the molten-fused fibers of 5 to 50% based on diameter of the ball structures,
- (c) a withdrawing strength of a crimped fiber strand connected to the molten-fused fibers of not less than 50% based on a linear strength of the crimped fiber strand itself used for the ball structures,
- (d) a core volume of 1 to 30% based on the volume of the ball structures, and
- (e) a crimping rate of the crimped fibers of from 10 to 75%.
Dependencies are inferred from the claim text.