Filter device for a plastic melt or another highly viscous fluid

A filter device for a plastic melt or another highly viscous fluid, comprising:

• a housing having at least:
• an inlet plate with at least one inlet channel,
• a discharge plate with at least one discharge channel;
• spacer elements arranged between the inlet plate and the discharge plate;
• and
• at least three housing clamping elements, with which the inlet plate and the discharge plate are braced against one another, enclosing the spacer elements;
• a screen wheel rotatably supported in the housing between the inlet plate and the discharge plate, the screen wheel having screen sections which can each be positioned and flowed through between the inlet channel and the discharge channel, wherein regions of the screen wheel which can be flowed through and to which fluid pressure can be applied lie within a pretensioned area which is spanned by the housing clamping elements;
• and
• a drive device having a drive element which exerts a feed force Fv on the screen wheel at an engagement point;
• wherein the engagement point of the drive device on the screen wheel is arranged outside the pretensioned area,
• wherein, when viewed in a direction of rotation of the screen wheel, an angle a greater than 90° and less than 160° is included on the screen wheel between a first line which extends between a surface center of gravity of the pretensioned area, at which a resulting frictional force FR acts, and the center of the screen wheel, and a second line between the center of the screen wheel and the engagement point, at which the feed force Fv acts, and
• wherein with respect to the part regions of the screen wheel situated that lie within the pretensioned area surface, more than 90% of a circumference of the screen wheel is surrounded by the spacer elements.

A filter device for a plastic melt or another highly viscous fluid, comprising:

• a housing having at least:
• an inlet plate with at least one inlet channel,
• a discharge plate with at least one discharge channel;
• spacer elements arranged between the inlet plate and the discharge plate;
• and
• at least three housing clamping elements, with which the inlet plate and the discharge plate are braced against one another, enclosing the spacer elements;
• a screen wheel rotatably supported in the housing between the inlet plate and the discharge plate, the screen wheel having screen sections which can each be positioned and flowed through between the inlet channel and the discharge channel, wherein regions of the screen wheel which can be flowed through and to which fluid pressure can be applied lie within a pretensioned area which is spanned by the housing clamping elements;
• and
• a drive device having a drive element which exerts a feed force Fv on the screen wheel at an engagement point;
• wherein the engagement point of the drive device on the screen wheel is arranged outside the pretensioned area, wherein, when viewed in a direction of rotation of the screen wheel, an angle α greater than 90° and less than 160° is included on the screen wheel between a first line which extends between a surface center of gravity of the pretensioned area, at which a resulting frictional force FR acts, and the center of the screen wheel, and a second line between the center of the screen wheel and the engagement point, at which the feed force Fv acts, and
• wherein an angle β of less than 60° is included between respective vectors of the resulting frictional force FR acting in the pretensioned area and the feed force Fv acting at the engagement point and straight lines leading through the respective vectors intersect outside the housing.