摘要:
A process for treating a cellulosic material comprising pretreating the cellulosic material and then extracting the cellulosic material with an extractant to selectively extract hemicellulose therefrom and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises a cellulose solvent and a co-solvent. The cellulosic product advantageously retains its cellulosic fiber morphology. The processes involve separating and recovering the hemicellulose and separating and recycling various process streams employed in the process.
摘要:
Hemicellulose compositions are prepared by treating a cellulosic material with an extractant comprising a cellulose solvent and co-solvent. The hemicellulose compositions preferably comprise from 55 to 99 wt.% xylan and have distinct molecular weights, elemental metal ions, and intrinsic viscosities when compared to known hemicellulose compositions.
摘要:
Engineered wood may be produced with substituted cellulose ester adhesives. For example, an engineered wood may comprise a plurality of wood substrates that independently comprise a lignin-containing material ( e.g., wood dust, wood particles, wood chips, and the like), the plurality of wood substrates being adhered together with an adhesive that comprises a substituted cellulose ester that comprises a cellulose polymer backbone having an organic ester substituent and an inorganic ester substituent that comprises an inorganic, nonmetal atom selected from the group consisting of sulfur, phosphorus, boron, and chlorine.
摘要:
Generally, an acquisition distribution layer for absorbent hygiene products may be produced from continuous tow bands. A system for producing such an acquisition distribution layer may include, at least, a tow band processing line and a master air jet in operably connected to the tow band processing line to receive a processed tow band from the tow band processing line so as to produce an acquisition distribution layer for an absorbent article.
摘要:
A degradable cigarette filter includes a filter element of a bloomed cellulose acetate tow, a plug wrap surrounding the filter element, and either a coating or a pill in contact with the tow. The coating and/or pill may be composed of a material adapted to catalyze hydrolysis of the cellulose acetate tow and a water-soluble matrix material. The material may be an acid, an acid salt, a base, and/or a bacterium adapted to generate an acid. The coating may be applied to the tow, the plug wrap, or both. The pill may be placed in the filter element. When water contacts the water-soluble matrix material, the material adapted to catalyze hydrolysis is released and catalyzes the hydrolysis, and subsequent degradation, of the cellulose acetate tow. The foregoing is also applicable to articles made of cellulose esters.
摘要:
A nonwoven material has a plurality of randomly oriented and bulked crimped filaments, a plurality of point bonds interconnecting said crimped filaments into a fixed, 3- dimensional structure, and either a surface portion of said fixed, 3 -dimensional structure having a greater density than an inner portion of said 3 -dimensional structure or an external surface of said fixed, 3 -dimensional structure being substantially free of any protruding filaments. The nonwoven material is made by: bulking a filament tow, fixing the bulked tow into a 3 -dimensional structure, and calendering the 3- dimensional structure.
摘要:
A process for the manufacture of cellulose esters is described. The process includes the steps of : pre- treating pulp for the removal of impurities with either caustic or acid or both, esterifying the pre- treated pulp, and recycling the caustic or acid or both from the pre-treating step.
摘要:
The instant application relates to a fiber bale and a method for producing the same. The instant fiber bale includes a highly compressed hexahedral fibrous material substantially free of disrupting curvatures on a top side or a bottom side. The highly compressed hexahedral fibrous material has a packing density of at least 300 kg/m3. The method for producing a fiber bale according to instant invention includes the following steps: (1) providing a press for producing a highly compressed hexahedral fibrous material comprising at least one convex bale platen; (2) filling the press- with the fibrous material; (3) pressing the fibrous material via the press; (4) thereby forming the highly compressed hexahedral fibrous material; (5) packaging the highly compressed hexahedral fibrous material with a wrapping material; and (6) securing the wrapping material thereby producing the fiber bale.
摘要:
An apparatus for opening a crimped multifilament tow comprising : a source of crimped multifilament tow ; at least one pair of opposed gripping rollers comprising a first roller which is a metal roller and a second roller which is a smooth-surfaced roller made of a material selected from the group consisting of : polyurethane or silicone rubber ; where the multifilament tow passes between and in contact with both of the rollers and filaments of the tow are separated from one another and opened.
摘要:
The instant invention is a stuffer box crimper and a method for crimping. The stuffer box crimper according to instant invention includes a pair of nip rollers, a pair of doctor blades, and a stuffer box. The pair of doctor blades is adjacent to an exit end of the pair of nip rollers. The stuffer box includes a stuffer box channel adjacent to the pair of doctor blades, and the stuffer box channel includes a surface consisting of a hard material having a hardness of at least 60 Rc. The method of crimping according to instant invention includes the steps of (1) providing a stuffer box crimper including a stuffer box having a stuffer box channel including a surface consisting of a hard material having a hardness of at least 60 Rc; and (2) crimping via the stuffer box crimper.