Described herein is a liquid injector for a barrel extruder as well as methods and processes of manufacturing irradiation crosslinked polypropylene foam. In some embodiments, this includes a liquid injection barrel element that is incorporated in an extruder barrel that includes at least one injection port, a temperature sensor well, and cooling channels.

Described herein is a liquid injector for a barrel extruder as well as methods and processes of manufacturing irradiation crosslinked polypropylene foam. In some embodiments, this includes a liquid injection barrel element that is incorporated in an extruder barrel that includes at least one injection port, a temperature sensor well, and cooling channels.

A screw having a longitudinal body and, around this longitudinal body, at least one flight extending in the shape of a helix, the flight including, over part of its length, internal partitioning delimiting a plurality of internal channels that extend in the shape of helices following the helix shape of the flight. The screw includes manifold-like cavities into which the ends of the interior canals open, the manifold-like cavities extending radially and opened into a longitudinal bore of the body at longitudinally spaced locations. This screw can be produced by additive manufacturing using laser-induced fusion.

The invention concerns a method for preparing an adhesive composition using an extruder having at least two rotating screws, successively comprising: feeding a plasticizer into the extruder; degassing the plasticizer in the extruder; feeding a silylated prepolymer and mixing the latter with the plasticizer in the extruder; and discharging the mixture from the extruder.

The invention concerns a method for preparing an adhesive composition using an extruder having at least two rotating screws, successively comprising: feeding a plasticizer into the extruder; degassing the plasticizer in the extruder; feeding a silylated prepolymer and mixing the latter with the plasticizer in the extruder; and discharging the mixture from the extruder.

A planetary roller extruder includes a housing with an internal housing toothing. A central spindle is disposed in the housing and has an external central spindle toothing. A plurality of planetary spindles are disposed about the central spindle and in the housing. Each of the planetary spindles has an external planetary spindle toothing configured to mesh with the internal housing toothing and the external central spindle toothing. A drive is configured to rotate the central spindle. The drive includes a drive journal connected to the central spindle to permit transmission of a driving force from the drive to the central spindle. The drive journal includes a bore. The bore has internal projections configured to engage with the external central spindle toothing to secure the central spindle to the drive journal by a screw-type connection.

A screw for a plasticating apparatus has one or more helical flights. A portion of the screw has a plurality of advancing grooves arranged in a noncontinuous helix cut in the screw. The advancing grooves are dimensioned to receive material therein as the material is conveyed through the barrel. The screw has a plurality of noncontinuous cross-cut grooves traversing one or more of the advancing grooves. The cross-cut grooves have a second helix angle greater than the first helix angle and less than ninety degrees; and/or one or more of the cross-cut grooves have a third helix angle of about ninety degrees.

A multiple screw extruder (50) combines application of vacuum to a vacuum vent (62) positioned between material feed locations (70, 72) of the extruder and use of specially configured extruder screws (58) to extract gases, primarily air, out of the extruder to densify the materials introduced into it and to extract unwanted fluid from material introduced for mixture with molten polymeric material flowing through the extruder. The multiple screw extruder is operationally versatile in that it is capable of carrying out the material densification and fluid extraction processes either separately or simultaneously. Implementation of the disclosed vacuum feed technology provides an increase in rate of extrudate throughput as compared with that achievable by implementation of atmospheric venting (16) in a conventionally configured extruder (10a, 10b).

A multiple screw extruder (50) combines application of vacuum to a vacuum vent (62) positioned between material feed locations (70, 72) of the extruder and use of specially configured extruder screws (58) to extract gases, primarily air, out of the extruder to densify the materials introduced into it and to extract unwanted fluid from material introduced for mixture with molten polymeric material flowing through the extruder. The multiple screw extruder is operationally versatile in that it is capable of carrying out the material densification and fluid extraction processes either separately or simultaneously. Implementation of the disclosed vacuum feed technology provides an increase in rate of extrudate throughput as compared with that achievable by implementation of atmospheric venting (16) in a conventionally configured extruder (10a, 10b).

A simulation apparatus includes an 1D analysis unit which performs a low-dimensional fluid-flow analysis of material in an arithmetic object field of a kneading device, based on setting information including physical property of the material, and configuration data and an operation condition of the kneading device for kneading the material, an area selection unit which receives selection of an object area as an object of a high-dimensional fluid-flow analysis in the arithmetic object field, and a 3D analysis unit which extracts physical quantities of the material relating to the object area, based on a result of the low-dimensional fluid-flow analysis, and performs a high-dimensional fluid-flow analysis of the material in the object area, based on the extracted physical quantities and the setting information.