A film-stretching apparatus in accordance with an embodiment of the present invention includes a stretching furnace which is divided into a plurality of air amount control zones. In a case where the number of the plurality of air amount control zones is seven, a total amount of air to be discharged from, out of the plurality of air amount control zones, three air amount control zones which are located on an entrance side of the stretching furnace is controlled so as to be larger than a total amount of air to be discharged from, out of the plurality of air amount control zones, three air amount control zones which are located on an exit side of the stretching furnace.

An oven, adapted to heat preform building material arranged on a transportable, plate-like mold carrier for producing preform building elements used for building a rotor blade of a wind turbine is provided, with a housing adapted to receive several covered mold carriers and having a closable front and a closable rear opening for loading and unloading the mold carriers, wherein the housing includes several receiving means arranged in different levels with each receiving means being adapted to receive at least one mold carrier, and with several heating means assigned to the several intermediate spaces between vertically adjacent mold carriers and the spaces below and/or above the top and bottom mold carrier and adapted to heat the preform building material.

The invention relates to an improved blowing nozzle, in particular for stretching systems, which is characterised by the following features, inter alia: the nozzle box (5) is divided in its longitudinal direction (L) into at least two regions, specifically a first longitudinal region (LB1) closer to the inflow side (7) and a second longitudinal region (LB2) that is subsequent and/or downstream and/or further away from the inflow side (7), the first longitudinal region (LB1) is convergent or comprises at least one convergent portion in which the height (H) between the lower face (11) and the upper face (15) is smaller than the height (H1) in the region of the inflow side (7) as the distance from the inflow side (7) increases, and the second longitudinal region (LB2) is divergent or comprises at least one divergent portion in which the height (H) between the lower face (11) and the upper face (15) is greater than the height (H) at the end of the first longitudinal region (LB1) and/or at the beginning of the second longitudinal region (LB2) as the distance from the inflow side (7) increases.

The present invention provides a method for treating a polymer workpiece for use in a joint implant. It comprises the steps of placing the polymer workpiece in an explosion chamber, introducing a combustible gas mixture into the explosion chamber and igniting the combustible gas mixture. Igniting the gas mixture in the explosion chamber produces a temperature that lies above the melting point of a polymer of the polymer workpiece.

The present disclosure relates to systems, methods and resins for additive manufacturing. In one embodiment, a method for additive manufacturing of a ceramic structure includes providing a resin including a preceramic polymer and inorganic ceramic filler particles dispersed in the preceramic polymer. The preceramic polymer is configured to convert to a ceramic phase. The method includes functionalizing inorganic ceramic filler particles with a reactive group and applying an energy source to the resin to create at least one layer of the ceramic phase from the resin.

A mold for forming a wind turbine blade is formed in two halves, each half 1a comprising a sandwich structure of a perforated outer layer, an inner aluminum honeycomb structure and an inner impermeable heat-conducting layer. An article in the form of a mat of glass fiber impregnated with epoxy resin is placed in the mold. A supply chamber 6 supplies heated pressurized air to the mold which passes into the honeycomb core of the mold through the perforated outer layer, and back through the outer layer into two exhaust chambers 7. A row of supply conduits 13 and exhaust conduits 16 connect the exhaust chambers 7 to the supply chamber 6. The air in each conduit 13, 16 is heated by a respective heat exchanger 18 supplied with heated water 9. The heated air cures the epoxy resin, and the mold is then cooled by supplying cold water to the heat exchangers 18, which, in turn cools the air supplied to the mold. The water used to cool the mold is then re-used for the subsequent heating of another article placed in the mold, in order to save energy. Alternatively, the article in the mold may be cooled using a separate supply of air which is not cooled in the heat exchangers 18.

A multi-component synthetic closure and/or a rod-shaped intermediate product which incorporate printed indicia comprising ink that is invisible under normal lighting and/or temperature conditions and a continuous, in-line manufacturing process therefor are described. In the preferred embodiment of the present disclosure, the core member of the synthetic closure and/or the rod-shaped intermediate product can be formed by a continuous extrusion process which enables the core to be manufactured as an elongated, continuous length of material. As the continuous elongated length of extruded material forming the central core is advanced from the extruder towards an outer skin forming station, the central core passes through a printing station for forming any desired indicia among which can be a registration mark that can be invisible under normal lighting and/or temperature conditions on the outer surface of the central core prior to the application of the outer skin layer.

A method for baking a continuous mat of mineral or plant fibers successively includes application of an aqueous solution, containing a binder diluted in the solution, onto mineral or plant fibers, shaping of the fibers to form a continuous mat on a conveyor in motion, and heating the mat in movement through an oven by a hot air flow at a temperature higher than the curing temperature of the binder. Furthermore, at least partial drying of the mat is carried out before entry into the oven. The at least partial drying includes irradiation of the mat in movement with radiofrequency electromagnetic waves whose frequency lies between 3 MHz and 300 GHz.

A film manufacturing method and manufacturing apparatus for manufacturing a film having excellent dimensional stability to heat at a good product yield and performing a stress relaxation treatment of the film include performing the stress relaxation treatment while conveying the film in a non-contact state using a levitation conveyance device for jetting a heated gas from gas injection holes to the film and conveying the film in a non-contact state. The film manufacturing method and manufacturing apparatus are particularly suitable for stress relaxation treatment of a polyimide film obtained by heat-treating a polyimide film precursor.

A system for the radiation treatment of substrates, which includes at least one radiation source above the substrate holders in a chamber, which holders are to be equipped with substrates that are to be treated, and the chamber has means for maintaining a gas flow in the chamber, having at least one gas inlet and at least one gas outlet, characterized in that the at least one gas inlet is situated in the vicinity of the substrate holders so that gas flowing in by means of the at least one gas inlet first flows around the substrate holders before either exiting the chamber directly via the gas outlet or exiting after flowing around the at least one radiation source.