Carrier films, adhesive tapes including the carrier film, hand tearable carton sealing tapes, and methods of making the same are described. The carrier films include a first layer of a polyethylene, and a second layer of a polypropylene coextruded therewith and biaxially oriented therewith. This carrier film has a first major surface and a second major surface. A pressure sensitive adhesive may be disposed on the first major surface of the carrier film to make an adhesive tape. The first major surface may be defined by the layer of polypropylene.

A laminate (110) of polypropylene films (100), a luggage shell (120) constructed of the laminate (110), a method (200) of making the laminate (110), and a method (280) of making the luggage shell (120) are provided. The films (100) include a core (102) and at least one outer layer (104). The laminate (110) includes a plurality of films (100). The laminate (110) may be formed by laminating a plurality of films 100 under predetermined pressure, temperature, and time conditions. The shell (120) may be formed by deep drawing a sheet of laminate (110) while applying heat and tension to the laminate (110).

A laminate (110) of polypropylene films (100), a luggage shell (120) constructed of the laminate (110), a method (200) of making the laminate (110), and a method (280) of making the luggage shell (120) are provided. The films (100) include a core (102) and at least one outer layer (104). The laminate (110) includes a plurality of films (100). The laminate (110) may be formed by laminating a plurality of films 100 under predetermined pressure, temperature, and time conditions. The shell (120) may be formed by deep drawing a sheet of laminate (110) while applying heat and tension to the laminate (110).

The thickness profile of a film tube manufactured using a film blowing process is regulated using a control system consisting of segmented control zones and at least at two measuring units for the film thickness such that the specified target film thickness profile exhibits deviations from a uniform film thickness in the form of one or two thin spots opposite each other, which serve to compensate for film thickness changes across the film width which occur during the monoaxial orientation in machine direction so that a film web is produced as a result of orientation whose thickness profile has as few deviations as possible from the target thickness across the entire width of the film web, the final film should exhibit a thickness profile where the thickness increase from the middle of the film to the edges is as minor as possible and the flatness of the film is improved.

It is provided an extrusion device for a plastic profile, in particular a hollow chamber profile, with an extruder, an extrusion nozzle arranged at the exit of the extruder for forming the plastic profile the plastic profile subsequently being guided through a calibration device, a downstream removal device for the plastic profile, a cutting device for cutting off parts of the extruded plastic profile and a weighing device for measuring the profile weight. A profile monitoring device is provided for detecting at least one profile parameter of the plastic profile in the extrusion direction after it has emerged from the extrusion nozzle and/or a process monitoring device is provided for detecting at least one process parameter in and/or before of the extruder, the extrusion nozzle, the calibration device, the removal device and/or the cutting device.

Provided is a measurement device (10) for detecting local thickenings in a film web (20), more particularly an extrusion and/or coextrusion film, having a first roll (14) for rolling on the film web (20) that can be moved along, a second roll (18) that can be supported indirectly above the film web (20) on the first roll (14) for rolling on the film web (20) that can be moved along, wherein the second roll (18) is resiliently guided in the thickness direction of the film web (20) that can be moved along, more particularly in the vertical direction, and at least one distance sensor (24) that is stationary with respect to the first roll (14) and/or to the film web (20) that can be moved along, for detecting a distance of the second roll (18). The second roll (18), which can be displaced from a local thickening of the film web (20) in the thickness direction of the film web (20), makes it possible to quickly and easily detect local thickenings in a film web (20).

A method is disclosed for determining at least one geometric parameter of an object comprising a molten component. The method includes determining a relationship between a refractive index of the object and a shrinkage occurring during a solidification of the object. The refractive index and at least one geometric parameter of the object comprising the molten component is determined using a measuring apparatus. At least one geometric parameter of the solidified object from the refractive index and the at least one geometric parameter of the object comprising the molten component is determined using the measuring apparatus and taking into account the determined relationship between the refractive index of the object and the shrinkage occurring during the solidification of the object.

Measuring a tubular measured object, in particular, following its extrusion, may include (1) guiding the tubular measured object in an object adjusting direction through a measuring space between a radar transceiver and a reflector, (2) emitting a radar transmitting beam from the radar transceiver along its optical axis in a transverse direction through the measuring space towards a reflector and back towards the radar transceiver, while determining an empty time of flight, (3) adjusting the radar transceiver in an adjusting direction (y) which preferably runs perpendicular to the transverse direction (x), and emitting and receiving the radar transmitting beams at various adjustment positions, (4) upon detecting a measurement signal (a) measuring the adjustment position (ys) and the time-of-flight shift, (b) measuring an external radius (r) of the tubular measured object, and, (c) determining the refractive index (n) of the tubular measured object from the values recorded.

The invention relates to a plant for producing a coextruded multilayer film with at least one extruder device for providing material melts of thermoplastic materials, with a device comprising a coextrusion adapter and a nozzle part for coextruding a multilayer coextrusion composite of interconnected individual layers, wherein the coextrusion adapter has a central channel for producing a central layer of the coextrusion composite, at least one coextrusion channel for producing at least one further layer of the coextrusion composite interacting with the central layer, a plurality of displaceable adjusting elements for adjusting layer thicknesses and/or layer thickness profiles of individual layers of the coextrusion composite, and adjusting devices for actuating the adjusting elements, having a drive unit for driving the adjusting devices, having a measuring device for measuring layer thicknesses and/or layer thickness profiles of individual layers of the multilayer coextrusion composite, the measuring device being set up to measure the individual layer thicknesses and/or the individual layer profiles downstream of the nozzle part, and having a system controller for controlling the system, wherein the system controller comprises a controller unit which is set up so that relative positions of adjusting elements can be manipulated automatically, preferably iteratively, by means of the drive unit as a function of layer thicknesses and/or layer thickness profiles measured on the multilayer film already leaving the nozzle part.

A device for determining the temperature of a tubular strand conveyed out of an extrusion device includes at least one temperature sensor configured to measure a first temperature of an outside of the tubular strand at a first position of the tubular strand. An evaluation apparatus further included and configured to compare the first temperature with a second temperature of the outside of the tubular strand at a second position of the tubular strand and determine at least one of a temperature within the tubular strand or a temperature on the inside of the tubular strand at a position of the tubular strand based on the comparison of the first and second temperature.