摘要:
The present invention concerns a process for the mechanical or mechano-chemical treatment of biomass, wherein a mixture containing the biomass and optional further chemicals is pressed through the openings of one or more compactor one or more times. The process can be operated in a continuous manner by using more than one compactor and more than one compacting cycle, whereby the multiple compactors are operated sequentially.
摘要:
An apparatus for processing and compressing pulp, comprising a circular perforated sieve base disc and at least one roll wheel circulating and rotating on the sieve base disc, where the sieve base disc and said at least one roll wheel rotating on the sieve base disc are shaped as bevel gears and make up a bevel gear assembly, by which the rotating force can be introduced in the gears of the bevel gear assembly to be partly converted to a compressive force for compressing the pulp to be processed through perforations in the bevel gear like sieve base disc.
摘要:
The present invention concerns a process for manufacturing a thermoformable plasticized composite containing cellulose fiber and polylactide by blending the dry cellulose fiber and a compatibilizer in a compactor into pellets, and subsequently reacting the reactive compatibilizer and the mixture of cellulose fiber and polylactide by compounding. The invention also concerns a composite manufactured using said process, as well as further processed products.
摘要:
In a method, cellulose carbamate is dissolved in an alkaline aqueous solution in different steps with solutions having different concentrations. The dissolving is carried out in three steps: 1) prewetting of the cellulose carbamate is performed with a dilute aqueous NaOH solution, under simultaneous cooling; 2) more concentrated NaOH solution, cooled to a temperature lower than 0°C, is added, under simultaneous stirring, in such a way that the cellulose carbamate is dissolved and the alkali concentration of the solution exceeds 9%, and subsequently, 3) a dilute NaOH solution is added so that the final alkali concentration of the solution drops to a value below 9%.
摘要:
A transglycosylation product, a method of producing the same and use of the product. The transglycosylation product comprises an alkyl or hydroxyalkyl glycoside of a cellulose ester or ether, wherein the alkyl or hydroxyalkyl groups of the glycoside residue comprise a carbon chain having 1 to 4 carbon atoms, and having 0 to 2 free hydroxyl groups and being attached to the 1 -carbon of the anhydroglucose unit via an oxy group. The product can be produced by mixing the cellulose derivative with mono-, di- or triol to form a reaction mixture, after which the reaction mixture is heated and the reaction is continued until a clear mixture is obtained. After cooling the recoverable product is suitable for use for example as an adhesive or as a hydrophobic coating.
摘要:
The invention relates to a method for manufacturing cellulose carbamate. In the method, an auxiliary agent and urea in solution form and possibly in solid form are absorbed into cellulose, and a reaction between cellulose and urea is carried out in a mixture containing cellulose, a liquid, the auxiliary agent, and urea. The absorption of the auxiliary agent and urea into cellulose, and the reaction between the cellulose and the auxiliary agent at least partly are carried out in a working device. According to the invention, it is possible to manufacture cellulose carbamate without ammonia, organic solvents or other auxiliary agents, by using only a small quantity of water as a medium.
摘要:
The invention relates to a method for preparing a cellulose carbamate solution. In the method, the dissolving is performed in two steps, first by moistening the CCA pulp with a dilute alkaline solution and finally by admixing a concentrated alkaline solution, as cold as possible, to the pulp under intensive stirring. The technique utilizes the low freezing point of the aqueous NaOH solution at the concentration of 18%, wherein the freezing point is below -20°C, and the intensive stirring function of the dissolve mixer device during the dosage. According to the invention, it is possible to prepare solutions of high quality and having high dry matter content in a mixing time of a few minutes only.
摘要:
A double layer capacitor comprises current collectors, electrodes and an electrolyte. The capacitor (C) is manufactured with a printing technique and it is connected to other electronics (R,V) also manufactured with a printing technique. The capacitor (C) is arranged to provide power to said other electronics. Cellulose carbamate can be used in the capacitor as a binder of conductive particles or as a separator.
摘要:
A process for manufacturing transglycosylation products. According to the process, a starch derivative is reacted at acidic conditions with an alkanol containing 1-6 hydroxyl groups and the reaction product is recovered as such or it is subjected to further processing. According to the method, the transglycosylation reaction between the starch derivatives and the alkanol is carried out in a reactive extrusion process, whereby the reaction can essentially be performed in the absence of liquid media at high yield. The invention also relates to new transglycosylation products of starch derivative, containing anions derived from a phosphorus-containing acid, which are chemically bonded to the product.
摘要:
A method of producing dissolving pulp from a recycled fibrous feedstock. The method comprises providing a fibrous material comprising cellulose, lignin and hemicellulose, said fibre source further having a lignin content of 0.1 to 7 % lignin and an ash content of up to 3%;subjecting the fibrour material to an alkaline extraction at a temperature of about0 to 25 º C, to produce fibres having a reduced content of hemicellulose; subjecting the fibres thus obtained to a bleaching treatment carried out with oxidative chemical reagents in order to reduce the lignin content of the fibres; and recovering the fibres thus obtained. By means of the method, dissolving pulp can be produced from recycled paper and cardboard products.