An electrical air heater for a calender roll diameter control device is described. The heater comprises a tube (23) for directing a flow of air along the inside of the tube from a plenum (12) toward an object which is to be heated. An electrically resistive heating element (18) is mounted inside the tube to heat the flow of air as it flows from the rear to the front of the tube. Since the air is h...

Alumina hydrate particles have a high surface area and low dispersity and may have a low soluble soda content. They may be made by milling a liquid suspension of alumina hydrate, subjecting the milled suspension to classification into coarse and fine fractions, recycling the coarse fraction to the mill and recycling the fine fraction to the classification stage. A narrow particle size distribution...

The object of the present invention consists in a single-use self-heating container (1) for liquids and/or solids, said container (1) comprising an insulating external envelope (2), a plastic material vessel (4), arranged within said envelope and fastened to the same as an integral piece, said vessel (4) being divided into two compartments, i.e. an upper (7) and a lower (11) compartment separated ...

Alumina hydrate particles have a high surface area and low dispersity and may have a low soluble soda content. They may be made by milling a liquid suspension of alumina hydrate, subjecting the milled suspension to classification into coarse and fine fractions, recycling the coarse fraction to the mill and recycling the fine fraction to the classification stage. A narrow particle size distribution...

A shading and heating insulating device, especially for greenhouses, has two films of flexible plastic material interconnected to form a type of pouch enclosing a hollow space, which is preferably divided into a plurality of tunnels. A supply pipe is operatively quick-coupled to one end of a distribution conduit, the jacket of which is operatively connected to one edge of the hollow space for feed...

A shading and heating insulating device, especially for greenhouses, has two films of flexible plastic material interconnected to form a type of pouch enclosing a hollow space, which is preferably divided into a plurality of tunnels. A supply pipe is operatively quick-coupled to one end of a distribution conduit, the jacket of which is operatively connected to one edge of the hollow space for feed...

In order to create a technically more effective and more economical method of decontamination by which complete decomposition of all injurious substances is obtained in simple fashion, it is proposed, in connection with a method and a plant for the treatment of contaminated soils, that the drying can be combined in a mill passed through by hot gases with a crushing of the material to a particle si...