Abstract:
In a method for automatically applying cut strips of material with varying lengths onto a tire building drum for manufacturing green tires a cut strip of material, comprising a forward portion with a leading edge, a middle section, and an end portion, is fed with a conveyor belt to a tire building drum. The leading edge of the forward portion is placed onto the tire building drum, being rotated at a first circumferential speed, that is substantially identical to a first feeding speed of the conveyor belt, during application of the forward portion. The first circumferential speed of the tire building drum is increased to a second constant circumferential speed for applying the middle section. Simultaneously, the first feeding speed of the end less conveyor belt is increased to a second feeding speed which is controlled as a function of the actual length of the cut strip of material. The second constant circumferential speed is reduced to a third circumferential speed and the second feeding speed is reduced to a third feeding speed, that is substantially identical to the third circumferential speed, for applying the end portion.
Abstract:
The invention describes a sack (220) which (220) is formed by first transverse sealing seams (110, 150) from a foil tube (101), and which (101) is provided with at least a first vent channel (20), which runs largely parallel to the axis of the film tube (101), and whose inner (40) film layer has first vent openings for venting of the sack interior (210) into the first vent channel (20). It is characteristic that at least a second vent channel (140) is provided, which is connected to the first vent channel (140) by second vent openings (90, 100, 200), and which, in turn, has third vent openings (120), which vent the at least one second vent channel (140).