Übersetzung für "Presshilfsmittel" in Englisch

A pressing aid can also be used in the production of the intermediate 14 .

Suitable pressing aids are, for example, polyvinyl alcohol, polyvinyl acetate, aluminum stearate, polyacrylate, polyether and sugar.

In addition to the coloring substances, suitable water-soluble binders can also be used as compression aids for the powder.

Pressing is known per se and can be carried out with or without pressing aids.

These pressing auxiliares are used preferably in amounts of up to, in total, a maximum of 2% by weight, based on the resulting mixture.

Firstly, a 60% strength dispersion of the SiC powder in water was prepared with stirring, in which the sintering and pressing aids had previously been dissolved or suspended.

As pressing aid, use is advantageously made of polyvinyl alcohol which is obtainable under the name Polyviol from Wacker-Chemie GmbH, Munich, together with sugar (sucrose).

The pressed shaped bodies are subjected to heat treatment for from 10 to 24 hours at temperatures in the range from 100 to 1000° C. in the presence of an inert atmosphere in order to remove the pressing aids and to pyrolize any pore-forming additives which may be present.

The products Kenolube® from the company Höganäs AB, Sweden, H-wax® from the company Höchst AG, Germany, and Promold® from the company Morton International, Cincinnati, USA, are specifically described as lubricants or auxiliary pressing agents, which can be mixed with the iron powder at a weight percentage of 0.2 to 0.8.

The stearates often used as pressing auxiliaries during the preparation of tablets are unsuitable as additives as they adversely affect the handling of the tablets on the one hand and on the other hand complicate a reproducible and homogenous dying of the prostheses materials.

Advantageously, polyvinyl alcohol obtainable under the name Poiyviol from Wacker-Chemie GmbH, Munich is used together with sugar (saccharose) as a pressing aid.

The pressed shaped bodies are subsequently subjected to heat treatment for from 10 to 24 hours at temperatures in the range between 100° and 1000° C. in the presence of an inert atmosphere, to remove the pressing aids and to pyrolyze the additives forming pores.

In a first variant, the obtained powders were pressed with or without pressing auxiliaries to powder green compacts and the latter were partly or densely sintered at temperatures of from 800 to 1100° C. and then further processed by machining or by hot pressing to form dental restorations.

In a second variant, the obtained powders were pressed with or without pressing auxiliaries to powder green compacts and the latter were then further processed by machining or by hot pressing to form dental restorations.

The process of claim 7, wherein the compression aids comprise paper fibers, wood meal, cellulose and/or other carbon-containing substances, which are capable of oxidizing in the burning process.

The process of the invention for producing an article composed of a soft-magnetic composite comprises: provision of a slip comprising a particulate soft-magnetic material, a particulate polymer binder, a spraying auxiliary and a slip medium, spray drying of the slip, dry pressing of the granules obtained by spray drying together with a pressing aid, heating of the pressed article to a temperature above the melting point of the polymer binder.

The production of the ready-to-press powder took place by weighing in the individual powders, by adding about 1 weight % of microwax as pressure auxiliary means and by mixing them afterwards for 15 minutes in a tumbling mixer.

Corresponding components can also, following the addition of a pressing agent (for example an organic binding agent) to the lead zirconate titanate, be pressed into a green body that is baked before the sintering process.

Since the surface quality necessary for a subsequent painting often cannot be ensured in sufficient quality in the production process, and furthermore, residues of the internal and/or external pressing aids, such as mold release agents, are also still present, further process steps, such as deburring, padding, powerwash or flame treatment, are added in order to obtain the wettable surface necessary for painting, which then also renders possible a good adhesion of the coating.

Examples of additives that can be added as desired include antifoaming agent, pressing aid, organic binders, photocatalysts, preservatives and rheological additives.

The pure iron powder can be used together with the auxiliary pressing agent of the company Höganäs AB, Sweden, which is known by the trade name of Kenolube®.

To this end, the auxiliary pressing agent Kenolube®, which essentially includes an amide wax and zinc stearate, is added to the pure iron powder at a weight percent of 0.4 to 0.7, for example, 0.5 to 0.6, and mixed with it to form the starting mixture.

The method of producing a hard metal grade powder according to claim 1, which comprises employing paraffin as a pressing aid.

It was established that the wax emulsion, in addition to its inhibitor property acts at the same time as an excellent pressing aid, whereby the homogeneity and green density or green solidity of the pressed molded part at the same molding pressure (in the comparison to the molding pressure or the properties of a molded part, which was prepared according to the prior art) is increased or a smaller molding pressure is required, in order to obtain the same properties with the molded part, which were obtained without use of a wax emulsion in the milling liquid.

The structural impairment of the mash can at least largely be compensated by adding pressing aids (see FIG. 3).

In contrast to the state of the art, it is even possible to eliminate the adding of other aids, which are not part of the fruit and cause additional costs.

After suction extraction of the suspension, the powder was dried for 24 hours at 120° C., cooled to room temperature and mixed for 24 hours with a pressing agent (mixture of polyvinyl alcohol, water and glycerine) in the ball mill (“tempering”).