Kneader and rheometric analysis method in a kneader
AssigneeGebruder Haake GmbH
InventorGebhard Schramm
Life of this patent
Estimating the term…
Abstract
A kneader for viscoelastic materials has a kneading chamber constructed in a casing and which contains at least two rotated rotors with which the materials can be kneaded to a viscoelastic mass. In order to be able to determine in a sufficiently precise manner the elastic and viscous parameters of the mass to be kneaded during the kneading process and follow it over time, a test chamber is provided, to which can be supplied from the kneading chamber a test fraction of the mass and use is made of a preferably dynamically measuring rheometer for determining the elastic or viscous parameters of the test fraction of the mass in the test chamber. The inner wall of the kneading chamber is formed sectionwise by an adjustable wall part and the test chamber can be formed by retracting said wall part.
Claims14
A kneader for kneading viscoelastic materials, comprising:
- a casing having interior walls defining a kneading chamber with an access opening, for receipt of materials to be kneaded;
- a pair of rotors within said kneading chamber for kneading the materials;
- at least a portion of one of the interior walls being movable between a forward position in which the movable wall portion cooperates with the interior walls to define the kneading chamber and a retracted position in which the movable wall portion cooperates with the access opening to define a test chamber extending from the kneading chamber for receipt of a test fraction of the materials;
- and
- a rheometer for determining elastic and/or viscous parameters of the lest fraction.
A method of rheometric analysis of a viscoelastic mass, comprising the steps of:
- (a) kneading the mass in a kneading chamber;
- (b) supplying a test fraction of the mass to a test chamber in which the test fraction is not exposed to kneading;
- (c) subjecting the test mass to rheometric analysis within the test chamber;
- and
- (d) returning the test mass to the kneading chamber.
Dependencies are inferred from the claim text.