A resistive film heater includes: a resistive heating layer comprising lignin-based electrically conductive carbonaceous materials; and electrical terminals attached to the resistive heating layer for supplying electrical current therethrough.

Method for joining at least two sections of a wind turbine blade, use of an air heater device in a method for joining at least two sections of a wind turbine blade and external heater for use in a method for joining at least two sections of a wind turbine blade

The method for joining at least two sections of a wind turbine blade involves providing an air heater device (3) and with the air heater device (3) supplying a stream of heated air into inner hollow spaces of first (11) and/or second blade sections (12) at least in a joining region (2) and/or placing an external heater (6) on an outer surface of the first (11) and/or second blade sections (12) at least in the joining region (2), wherein the external heater (6) comprises a multitude of heating zones (62-69), wherein a heating power in the heating zones (62-69) is individually controlled.

The method according to the invention improves the curing of a curable resin used to join the blade sections (11,12).

A roller apparatus for treating at least one web passing through the apparatus, the apparatus comprising a pattern roller in the form of a first cylindrical body mounted for rotation around an elongate axis (A) of the first cylindrical body, and an anvil roller in the form of a second cylindrical body mounted for rotation around an elongate axis (B) of the second cylindrical body. The pattern and anvil rollers are located adjacent each other to define a nip between outer cylindrical surfaces of the first and second cylindrical bodies. The first and second cylindrical bodies are configured to rotate, in use, in opposite directions to each other so as to draw the at least one web through the nip defined between the outer cylindrical surfaces of the first and second cylindrical bodies. The outer cylindrical surface of the first cylindrical body defines a raised profile section having a predetermined shape that extends both widthwise and circumferentially of the first cylindrical body. The pattern roller incorporates an elongate cartridge heater extending widthwise along the elongate axis (A) of the first cylindrical body. The cartridge heater defines at least two outer zones located widthwise on opposite sides of a centrally located middle zone. The cartridge heater is configured to generate, in use, more heat in the outer zones than in the middle zone.

A manufacturing method of a fiber includes: mixing and stirring a plurality of raw materials, to form a mixed liquid, where the plurality of raw materials includes dry copper nanopowder with a particle size not more than 48 nm, a fiber slurry, and an additive; drying the mixed liquid, to remove moisture of the mixed liquid and form a processed raw material; heating the processed raw material, to make the processed raw material be in a semi-molten state; electrifying the processed raw material in the semi-molten state, and then extruding at least one fibril from the processed raw material in the semi-molten state; stretching the at least one fibril; and performing cooling and shaping on at least one stretched fibril, to form a final fiber product.