摘要:
Winding machine for continuous winding of a material web, in particular a paper or cardboard web, onto a reel into a winding roll, having a movable pressing drum, which forms a winding gap with the winding roll, having at least one primary transport device by means of which the reel can be moved along a first guide track, and at least one secondary transport device that guides the reel along a second guide track. To prepare for a reel change, the new reel can be shifted by the primary transport device into a reel-changing position in which a new winding gap is formed between the new reel and the pressing drum. In the reel-changing position, the material web is guided over a circumference region of the new reel.
摘要:
A method and device for winding a paper web to form a reel. The web is wound onto a shell that is predominantly centrally driven to introduce a torque that winds the web on the shell into a reel. A pressure element extends over the width of the web and acts continuously on the outer surface of the reel being wound in order to squeeze out air. A web threading roll comes adjacent the shell during web threading. Once the web is threaded, the shell is moved generally horizontally from the web threading toward the main winding position where the web is wound. A compensation device supports the reel being wound. The first pressure element in contact with the reel may move away, and a second pressure element closer to the compensation device may press upon the reel, after the first pressure element has moved away.
摘要:
For winding up of a paper web to form a paper roll, a first reel spool is accelerated to the speed of the web and brought into a first, start-of-winding position in which it forms a nip with a driveable press drum. The beginning of the web of paper is guided around the press drum and is wound onto the first reel spool. When a first layer thickness has been wound, the first reel spool is transferred into a second, complete-winding position and the paper roll is wound up there to its desired layer thickness. During the entire winding process, the press drum or a special press roll are pressed against the winding surface of the developing paper roll, a torque is introduced into the axis of the first reel spool by means of a central drive and the press drum and/or press roll and the first reel spool with the developing paper roll thereon are displaced, preferably exclusively horizontally, without substantial changes in the direction or orientation of those elements. Then a second reel spool is accelerated and brought into the first position before transferring the web to the second reel spool.
摘要:
A winder for winding a running web of paper, foil or similar. A support drum of web width is provided, and a winding drum on which the web is wound to a roll. A pair of primary swivel levers each feature on one end a fork for receiving a winding drum bearing and is mounted with its other end in the region of the support roll axis in such a way that the winding drum, in swiveling from a first position above the support roll, will in the running direction of the web approach the support roll while moving around it, passing in the process a primary section until reaching a second position. The winding drum with the still unfinished paper roll is taken over by a pair of secondary swivel levers with an essentially horizontal guideway extending from the second position across a secondary section up to a third position. A contact device forces the winding drum onto the support roll, and a drive is coordinated with the winding drum. A slide features guideways for guidance of the drive as it passes through the primary section, and is connected with the primary levers in such a way that it also will perform their swivel movement. A connecting link guide adjusts the radial position of the slide according to the current paper roll diameter, and ensures the slide tracking according to the increase in paper roll diameter. A guide rod clutch is arranged between the drive and the winding drum.
摘要:
What is claimed is a process for preparing amino- or hydroxybenzonitriles, in which, in the course of an ammonolysis, the corresponding amino- or hydroxybenzoic acid compounds are reacted with ammonia in the presence of a supported catalyst comprising phosphate at temperatures between 250° C. and 500° C. The actual preparation step is performed in a reaction gas (mixture) and without involvement of an organic solvent, and is followed by an at least 2-stage purification step. In this purification step, the gaseous mixture obtained from the preparation step is first converted to an aqueous basic suspension and then the product present in the solid is released from this suspension. The main advantage of this combination process is that the starting materials are not esters, which is why the resulting products, in contrast to the processes which are otherwise customary, are free of the by-products which are otherwise customary, which leads to a high product purity. The process claimed can additionally be performed in an extremely economically viable manner, since the end product and the by-products are present in different states of matter in the suspension used and can therefore be separated easily from one another. In this way, solvent-free amino- or hydroxyl-containing benzonitriles are obtained in high yield and significantly improved product quality.
摘要:
The present invention is relative to a method of producing dry thioctic acid in which a raw material in which concentrated thioctic acid is present is treated with liquid or supercritical CO.sub.2, thus yielding thioctic acid with low residual solvent contents in a simple industrial method.
摘要:
1. A method of producing flowable R,S-thioctic acid, R,S-thioctic acid and its use. 2.1. Known methods of preparing flowable thioctic acid which can be galenically further processed by pressing to highly-concentrated, solid presentations with active-substance contents of more than 200 mg pure substance require the mixing of the thioctic-acid forms of different origins and/or a spraying on of galenic adjuvants from aqueous solution and a subsequent grinding process in order to arrive at a pressable granulate. 2.2. As a result of the fact that thioctic acid of any origin is placed in the fluid bed of a device suited for producing a fluid bed and that a built-up granulate consisting of thioctic acid is obtained by spraying a solution of thioctic acid of any origin onto the matter placed in the fluid bed under simultaneous removal of the solvent, it is possible to make a thioctic-acid form available which does not adhere to the pressing tool or exhibit a tendency to form fissures on the tablet even when tablets with 600 mg or more active-substance content are prepared. The novel R,S-thioctic acid has a specific surface of >0.7 m.sup.2 /g and a number of mesopores with a diameter between 2 and 30 nm.
摘要:
There is provided a process for the work-up of this material having the formula ##STR1## because of its poor crystallizability has heretofore been available only with large yield losses. The yield losses are due to the fact that the crystals of this compound are associated with large amounts of residual solvent material which gives rise to complex and expensive drying procedures. In accordance with the present invention the crude LPE is dried by means of fluid or supercritical carbon dioxide which maces it possible to reduce drying times from the previous range of about 124 hours to about 10 hours for the same amount of product and thus produce a dry LPE which has smaller amounts of residual solvent, as well as smaller by-products than that obtained by conventional drying.
摘要:
The invention relates to the production and purification of salts of 6,8-bis(amidiniumthio) octanoic acid, its enantiomers (+)-6,8-bis(amidiniumthio)octanoic acid and (-)-6,8-bis (amidiniumthio)octanoic acid and of the esters of these compounds as well as to their use to produce dihydrolipoic acid and .alpha.-lipoic acid.
摘要:
This disclosure describes two technical procedures for the high-yield synthesis of heterocyclic seven-membered ring-systems by Dieckmann-condensation avoiding usual dilution techniques and long reaction times. Thus, it significantly increases the overall yields of the pharmaceutically active ingredients azelastine and flezelastine, whose synthesis, starting from these seven-membered heterocyclic rings, is reported elsewhere. Yields range from 80-89%, avoiding waste and increasing economics of the synthesis.