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Yu C.-X.,Longpont Co. | Zuo X.,Longpont Co. | Ren X.-W.,Longpont Co. | Heng P.-Z.,Longpont Co.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

The intrinsic viscosities of aramid fibers were determined by using one-point measurement. The relationship between intrinsic viscosity of aramid fibers and the weight percentages of flocs and fibrids was investigated. A novel method was proposed to rapidly determine the ratio of flocs to fibers based on intrinsic viscosity measurement. The method is simple and efficient, showing great ability to determine the ratio of flocs and fibrids not only in meta-aramid fibers but also in the mixture of meta-aramid and para-aramid fibers.


Patent
Longpont Co. | Date: 2013-07-28

Synthetic paper, including: between 10 and 90 wt. % of structural fibers, and between 90 and 10 wt. % of bonding fibers. The structural fibers are poly(p-phenylene telephthalamide) (PPTA) fibers having a fineness of between 1 and 2 d, and a length of between 3 and 10 mm. The bonding fibers are fibrids or a pulp of the PPTA. The structural fibers and the bonding fibers are shaped by a wet-forming papermaking method, and hot rolled to form the synthetic paper.


A honeycomb sandwich panel of synthetic paper. The synthetic paper includes: between 20 and 75 wt. % of structural fibers and between 25 and 80 wt. % of bonding fibers. The structural fibers are poly(p-phenylene telephthalamide) (PPTA) fibers. The bonding fibers are fibrids of the PPTA. The structural fibers and the bonding fibers are shaped by a wet-forming papermaking method by a paper machine to yield the synthetic paper. The synthetic paper is coated, stacked, pressed, stretched, shaped, impregnated, cured, and sliced to form the honeycomb sandwich panel.


Patent
Longpont Co. | Date: 2015-06-28

Synthetic paper, including: between 10 and 90 wt. % of structural fibers, and between 90 and 10 wt. % of bonding fibers. The structural fibers are non-thermoplastic poly(p-phenylene telephthalamide) (PPTA) fibers having a fineness of between 1 and 2 denier, and a length of between 3 and 10 mm. The bonding fibers are fibrids or a pulp of the non-thermoplastic PPTA. The structural fibers and the bonding fibers are shaped by a wet-forming papermaking method, and hot rolled to form the synthetic paper.

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