An acrylic rubber excellent in water resistance and a method for producing the same are provided. An acrylic rubber composed of: 70 to 99.9 wt % of a bonding unit derived from (meth) acrylic acid ester; 0.1 to 10 wt % of a bonding unit derived from a cross-linkable monomer; and if necessary, 0 to 20 wt % of a bonding unit derived from another monomer, wherein the ash content is 0.5 wt % or less, the total amount of magnesium and phosphorus in the ash is 30 wt % or more, a ratio of the magnesium to the phosphorus ([Mg]/[P]) by weight is 0.4 to 2.5, and Mooney viscosity (ML1+4, 100° C.) of the rubber is 10 to 150 is particularly excellent in water resistance, and a rubber cross-linked product using the same is also excellent in physical properties.

A process for manufacturing a tubular film such as an edible casing film or a packaging film. The process includes the steps of providing a preblended powder composition containing a polymer matrix, a plasticizer, and water; feeding the preblended powder composition to an extruder; heating the preblended powder composition to a temperature above 100 degrees Celsius for a sufficient time to fully hydrate the polymer matrix and to convert the powder composition to a flowable mass; and extruding the flowable mass through a tubular die of the extruder to form the tubular film. The tubular film comprises: about 40-75 wt % polymer matrix; about 10-35 wt % plasticizer; and about 10-35 wt % water. The polymer matrix component is fully hydrated under the temperature, pressure and shear conditions inside the extruder, and may have a component which is only fully hydrated at temperatures above about 100 degrees Celsius.

A process for manufacturing a tubular film such as an edible casing film or a packaging film. The process includes the steps of providing a preblended powder composition containing a polymer matrix, a plasticizer, and water; feeding the preblended powder composition to an extruder; heating the preblended powder composition to a temperature above 100 degrees Celsius for a sufficient time to fully hydrate the polymer matrix and to convert the powder composition to a flowable mass; and extruding the flowable mass through a tubular die of the extruder to form the tubular film. The tubular film comprises: about 40-75 wt % polymer matrix; about 10-35 wt % plasticizer; and about 10-35 wt % water. The polymer matrix component is fully hydrated under the temperature, pressure and shear conditions inside the extruder, and may have a component which is only fully hydrated at temperatures above about 100 degrees Celsius.

An acrylic rubber sheet excellent in storage stability and water resistance, a method for producing the same, a rubber mixture containing the acrylic rubber sheet and a rubber cross-linked product thereof are provided. The acrylic rubber sheet according to the present invention includes an acrylic rubber having a reactive group and having a weight average molecular weight (Mw), a ratio of a Z-average molecular weight (Mz) and a weight average molecular weight (Mw) in a specific range. The acrylic rubber sheet according to the present invention has an ash content of 0.2% by weight or less, an amount of gel insoluble in methyl ethyl ketone is 50% by weight or less, and a water content of less than 1% by weight, and is excellent in water resistance and highly well-balanced in strength properties and processability.

A sizer for cooling an extrudate, which includes a core and a housing. The core includes an extrusion channel which accommodates the extrudate, a core cooling channel, and a core vacuum channel in fluid communication with the extrusion channel. The housing includes a housing cooling channel and a housing vacuum channel. The core cooling channel is in fluid communication with the housing cooling channel, and the core vacuum channel is in fluid communication with the housing vacuum channel.

A cooling device for external cooling of a film tube subjected to internal pressure in the production of blown films of thermoplastic material includes a cooling gas ring with a ring housing and a ring nozzle arranged concentrically to a central axis and being open towards the film tube. At least one inner ring channel extending in the circumferential direction about the central axis and being open radially inwards towards the ring nozzle is included. At least one feed channel for supplying cooling gas is attached to the ring housing and connected to the ring channel. The cooling device also includes at least one flow guiding device arranged in the at least one feed channel. When a cooling gas flows through the flow guiding device, at least a partial flow of the cooling gas is set in rotation about a flow axis prior to flowing into the ring channel.

The present invention relates to an extrusion die and a method for extruding a sheet using the same, and according to one aspect of the present invention, there is provided an extrusion die comprising a storage part configured to hold a raw material, the storage part defining a first width, a pressure part configured to move the raw material through the storage part, a first die defining a second width less than the first width, such that a flow width of the raw material becomes narrower, a second die in fluid communication with the first die, the second die defining a width that increases from the second width to a third width, such that the flow width of the raw material passing through the first die becomes wider and a flow thickness becomes smaller, and a heating part configured to heat the raw material passing through the second die.

The present invention relates to an extrusion die and a method for extruding a sheet using the same, and according to one aspect of the present invention, there is provided an extrusion die comprising a storage part configured to hold a raw material, the storage part defining a first width, a pressure part configured to move the raw material through the storage part, a first die defining a second width less than the first width, such that a flow width of the raw material becomes narrower, a second die in fluid communication with the first die, the second die defining a width that increases from the second width to a third width, such that the flow width of the raw material passing through the first die becomes wider and a flow thickness becomes smaller, and a heating part configured to heat the raw material passing through the second die.

Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.

Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.