摘要:
A device for continuous winding of webs on winding shafts onto winding rollers consisting of arms supporting the winding shaft, a pressure roller that can be engaged on the winding shaft or winding core, a knife separating the web during the roller change, and of a charging electrode supplying the web start with an electrostatic charge, which attaches the web start, newly formed by the web cut, on the winding shaft. In order to always maintain the correct equal distance to the web supplied with the charge, the same is tracked in such a manner that the distance of the charging electrode to the web remains constant regardless of the diameter of the winding shaft.
摘要:
An extruder die head for producing multilayered tubes made of thermoplastic material exhibits a central annular channel, which is provided with an annular outlet die. Into the outer limiting wall of the channel empty annular slits, which feed a polymer melt and which constitute the smaller diameter openings of truncated channels, formed between the internal and external shells of stacked, conical insert members. To reduce the axial length of the extruder die head, the annular slits, feeding the polymer melts, also empty into the inside wall of the central annular channel. The annular slits are the smaller diameter openings of truncated channels, formed between the internal and external shells of stacked conical internal insert members.
摘要:
An extruder die head comprises an internal cylindrical mandrel and a shell, which encloses said mandrel concentrically. Between said mandrel and shell an annular channel is formed that empties into the die slit. A polymer melt is fed through a line to the annular channel. To prevent the polymer melt in the area of the start of the annular channel from penetrating into a slit that forms between the mandrel and the shell due to heat expansion, there is between both mandrel and shell a ring with such a coefficient of thermal expansion that when heated up due to the polymer melt said ring seals the slit between the shell and the mandrel.
摘要:
The invention describes a device (1) that is intended for longitudinally stretching film webs (2) and that comprises a plurality of rollers (5, 6, 9, 10, 11, 12, 13, 18, 19), some of which are temperature control rollers, and some of which (9-13) form stretching gaps (22), in which the film web (2) can be stretched.At least one of the rollers (5, 6, 9, 10, 11, 12, 13, 18, 19) has a drive that is torque controlled.
摘要:
An air ring with increased-control over the gauge uniformity of blown plastic film in a film extrusion device. The air ring includes a generally annular plenum, an annular orifice for discharging cooling air against an extruded plastic tube passing through the air ring, and a flow path for cooling air between the plenum and the annular orifice. The air flow path is segmented along a circumference of the annular plenum, the segments including a material with high heat conductivity and guiding the air from the annular plenum to the orifice. Heating elements are provided for individually and selectively heating the segments of the air flow path such that the temperature of the cooling air discharge against the extruded plastic tube can be locally varied.
摘要:
An apparatus for the longitudinal stretching of a film web includes at least one heater in which the film web can be heated, at least one cooling device in which the film web can be cooled, and at least a stretching unit in which the film web is stretched in its longitudinal direction. The stretching unit has a first transport roller having a first peripheral speed in the stretching operation, followed by a second transport roller having a second peripheral speed along the transport path of the film web from the first transport roller, with the second peripheral speed being greater than the first transport roller speed. The apparatus includes a pressing device with which the film web is pressed against the first transport roller along a line which is in the area of the release line of the film web from the first transport roller.
摘要:
The invention describes an apparatus for the longitudinal stretching of a film web (1) comprising:at least one heater (4) in which the film web (2) can be heated,at least one cooling device (15) in which the film web (2) can again be cooled down, andat least a stretching unit (8) in which the film web (2) is stretched in its longitudinal direction, whereby the stretching unit (8) has a first transport roller (9, 10, 11, 12) that has a first peripheral speed in the stretching operation, followed by a second transport roller having a second peripheral speed as seen along the transport path of the film web (2) from the first transport roller, whereby the second peripheral speed is higher than the first transport roller speed,It comprises a pressing device (22) with which the film web (2) is pressed against the first transport roller along a line which is in the area of the release line of the film web (2) from the first transport roller.
摘要:
The invention describes a device (1) for the production of film tubes (3) comprising: a die head (5) comprising an annular nozzle (4), from which plastic melt for producing the film tube (3) can be extruded in a transport direction (y), at least one fluid-application device, which is annular in shape at least in certain regions and which follows the die head (5) in the transport direction (y) and which surrounds the film tube (3) annularly and by means of which a fluid can be guided toward the film tube, at least one ring (20), the diameter of which is larger than the annular region of the fluid-application device. An adjusting device (21) is provided, by means of which the ring (20) can be adjusted in height relative to the fluid-application device.
摘要:
An air ring with increased-control over the gauge uniformity of blown plastic film in a film extrusion device. The air ring includes a generally annular plenum, an annular orifice for discharging cooling air against an extruded plastic tube passing through the air ring, and a flow path for cooling air between the plenum and the annular orifice. The air flow path is segmented along a circumference of the annular plenum, the segments including a material with high heat conductivity and guiding the air from the annular plenum to the orifice. Heating elements are provided for individually and selectively heating the segments of the air flow path such that the temperature of the cooling air discharge against the extruded plastic tube can be locally varied.
摘要:
A device for the production of film tubes includes a die head having an annular nozzle, from which a plastic melt for producing the film tube can be extruded in a transport direction (y), a fluid-application device, which is annular in shape at least in certain regions and which follows the die head in the transport direction (y) and which surrounds the film tube annularly, and via which a fluid can be guided toward the film tube, and a ring, the diameter of which is larger than the annular nozzle of the fluid-application device. The device has an adjusting device, via which the ring can be adjusted in height relative to the fluid-application device.