A multi-layer tubular film is co-extruded and cooled to form a first bubble, then collapsed, preheated and blown into a second bubble. The second bubble is further heated from outside to produce a decreasing temperature gradient from the outside surface of the film to the inside surface of the film. The outside surface of the film is hotter than the inside surface of the film and the inside surface of the f film is hot enough for re-blowing but sufficiently cool to avoid blocking. The film is then collapsed, blown into a third bubble and cooled to produce biaxially-oriented film, which is then collapsed, blown into a fourth bubble, heated and then cooled film to relieve stress and impart desired shrink properties to the film to produce ship-stable biaxially-oriented film.

In an embodiment, the present invention provides a method for increasing the cooling performance of an extrusion line and for extruding a plastics profile, in particular a plastics tube, in an energy efficient manner, the method including the steps of: melting plastics material in an extruder; shaping a plastics strand and feeding the plastics strand to a die; shaping a plastics profile using the die; and calibrating and curing by cooling the profile in a cooling and/or calibration device, a gaseous medium being drawn through one or more cooling tanks in order to cool the outside of the profile. A temperature and a saturation of the gaseous medium is increased between an inlet region and an outlet region for the gaseous medium. A liquid medium is added between the inlet region and the outlet region using spray nozzles.

A film forming apparatus includes a die device which extrudes a molten resin in a tube shape to form a film, a measurement unit which measures a thickness profile of a film in a circumferential direction, a plurality of adjustment portions which change the thickness profile of the film, and a controller which controls the plurality of adjustment portions such that the thickness profile approaches a target thickness profile. The controller changes the target thickness profile based on the measured thickness profile.

The invention relates to a method for the online monitoring of film quality during a production process for a plastic film, in particular a blown film or a continuously cast film, in which method the film material (1) is fed out of an outlet device (40) that is designed as a melt lug (4) by a transport device (10). The film material (1) cools on or in front of the transport device (10) and the film material (1) solidifies in front of or on the transport device (10).

Provided is a strand producing apparatus including: an extrusion-molding unit configured to melt and knead a resin composition and extrusion-mold the resin composition into a strand shape; and a cooling/solidifying unit configured to cool and solidify the extrusion-molded resin composition having the strand shape, wherein the cooling/solidifying unit is a roll unit that includes a groove having a curvature and internally includes a coolant flow path, and wherein both of a coolant inlet and a coolant outlet of the coolant flow path are provided at the same end side of the roll unit.

A sweeper roller is provided for forming a film, the sweeper roller having helical grooves provided to the surface, wherein the ratio of the surface area of the helical groove portion is 30% or less of the surface area of the sweeper roller, and the width of the helical grooves in the axial direction of the sweeper roller is 25 mm or greater. Provided thereby are: a sweeper roller that does not generate air banks and sweeper marks during high-speed casting and when forming a thick film; a plastic film manufacturing device that uses the sweeper roller; and a manufacturing method.

This sheet manufacturing apparatus is provided with: a nozzle for extruding a heated resin sheet; a main roll with a surface on which microstructures are formed; a follower roll disposed at a distance from the main roll; and an electricity-supplying mechanism. The electricity-supplying mechanism heats an electrically conductive section of the main roll by supplying electricity to the electrically conductive section from both edges of the main roll.

In blown film installations, it is known to provide longitudinal stretching of the produced double layer film strip downstream of the draw-off, more precisely downstream of the reversing unit and upstream of the winder. It is also known to stretch the down-drawn film, wherein the film must then be preheated owing to the long cooling path from the draw-off. According to a first feature, the present invention specifies warming the film above the draw-off and then treating it mechanically. The film can thereby be brought with only little energy from a first level of warmth to a temperature level at which it can easily be worked. According to a second feature, the invention specifies providing a tractive force breakdown brake.

A battery separator is disclosed. The battery separator includes a polyolefin porous membrane which has a plurality of protrusions including a polyolefin. The protrusions are interspersed randomly on at least one surface of the polyolefin porous membrane at a density of not less than 3 protrusions/cm2 and not greater than 200 protrusions/cm2. The protrusions have a size W, where 5 mW50 m, and the protrusions have a height H, where 0.5 mH. The battery separator also includes a modified porous layer, including a fluorine-based resin, and a plurality of inorganic particles laminated on the at least one surface of the polyolefin porous membrane. A concentration of the inorganic particles is not less than 40 wt. % and is less than 80 wt. %.

An apparatus, and relative method, for producing a semi-finished product with a strip of sealing compound for building tires, having at least one unsaturated styrene thermoplastic elastomer, one bonding resin and one cross-linking agent are described.