A composition comprises a mixture of a hydroxypropyl methylcellulose having a DS of from 1.0 to 2.7 and an MS of from 0.40 to 1.30, wherein the sum of the DS and MS is from 1.8 to 3.6, and wherein DS is the degree of substitution of methoxyl groups and MS is the molar substitution of hydroxypropoxyl groups, and a sugar alcohol in a weight ratio of hydroxypropyl methylcellulose to sugar alcohol of from 98:2 to 85:15. The composition may for instance be used to purge extrusion equipment.

The invention relates to a filter device for a plastic melt or another highly viscous fluid, comprising a housing with an inlet plate and a discharge plate. At least one spacing element and a screen wheel which can be rotated by a drive device are arranged between the inlet plate and the discharge plate. The inlet plate and the discharge plate are clamped against each other with the inclusion of the spacing element via at least three housing clamping elements. An engagement point of the drive device on the screen wheel is arranged outside of the pretensioning surface. When viewed in the rotational direction, an angle α larger than 110° and smaller than 160° is formed on the screen wheel between a first line that extends between the pretensioning surface centroid on which a resulting frictional force F.sub.R acts and the center of the screen wheel and a second line between the center and the engagement point on which an advancing force F.sub.V acts.

A filtering device for highly viscous media, in which filtering device a rotatably mounted screening wheel which has a plurality of screening cavities is arranged between a front housing element and a rear housing element. According to the invention, a plurality of screening cavities lying beside one another, through which flow can pass jointly, are combined into at least one filter group. To this end, on both sides beside the filter group, a closed blocking segment is provided on the screening wheel which segment, when positioned in associated blocking regions of the housing, is sealed off with respect to the housing elements on both sides of the screening wheel. The blocking regions in the housing are in each case larger than or as large as a screening cavity together with a sealing web surrounding the same.

A device and a method for filtering viscous or highly viscous liquids, in particular plastics melts, includes use of an oscillating filter plate.

A filtering device for removing dirt particles and contaminants from a plastic melt is disclosed. The filtering device includes a housing having a filter chamber, an inlet for feeding plastic melt, an outlet for channeling plastic melt out, and a dirt outlet for discharging dirt particles from the housing. The filtering device also includes a filter element arranged in the filter chamber to retain any dirt particles contained in the stream of melt, and a cleaning unit for cleaning the filter element of dirt particles retained by means of the filter element. The cleaning unit having a cleaning head with a scraper member for detaching dirt particles from the filter element. The scraper member is coupled to a servomechanism to press the scraper member onto the surface of the filter element. The servomechanism has at least one bellows cylinder including a foot section, a head section, a deformable bellows element, and a pressure chamber of variable volume.

A method of producing a film in accordance with an aspect of the present invention includes: a first kneading and forming step of forming a composition obtained by kneading a polyolefin resin and a plasticizer; a stretching step of stretching the composition; a composition cleaning step of immersing the composition in a cleaning solvent and removing the plasticizer; a separation step of separating, from the cleaning solvent which has been used in the cleaning step, the plasticizer which has been eluted in the cleaning solvent; and a second kneading and forming step of forming a composition obtained by kneading a polyolefin resin and the plasticizer which has been separated in the separation step.

A device and a method for filtering viscous or highly viscous liquids, in particular plastics melts, includes use of an oscillating filter plate.

An encapsulant compound apparatus, includes a mechanical operator, and an insert disposed on a surface of the mechanical operator. The insert operates to capture foreign material in the encapsulant compound.

An extrusion device that produces plastic film includes at least two feed units that feed feedstock to an extruder, wherein each feed unit has at least one discharge opening including a discharge closure to open and close the discharge opening, and a container interface that reversibly fastens a discharge container that accommodates feedstock discharged from the respective feed unit.

A device for cleaning an extruder includes a frame that supports a screw and a barrel. When driven by a driver, the screw is rotatable about a longitudinal axis of the barrel. The barrel includes a feed inlet and an outlet that opens directly into an extrusion die mounted on a support. The frame is translationally movable relative to the die and the support in a direction parallel to the longitudinal axis between a first position, in which the barrel and the die are in sealed contact, and a second position, in which the barrel is moved away from the die in order to allow cleaning to be performed. The device also includes an automatic coupling mechanism that enables quick locking and unlocking of the barrel and the die, so that the frame can move between the first and second positions when the barrel and the die are unlocked.