Foods and beverages: apparatus – Edible laminated product making apparatus – Means feeding diverse center material
Patent
1996-01-11
1997-10-07
Simone, Timothy F.
Foods and beverages: apparatus
Edible laminated product making apparatus
Means feeding diverse center material
99353, 994501, 4251331, 425307, A23P 100, B29C 4700, B29C 4706
Patent
active
056736126
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a coextruding extruder especially for foodstuffs like paste and stuffing, said extruder comprising a mantle surrounding a number of flights corresponding to the number of materials to be coextruded, and an extruder head. The flights in the extruder are coaxial and placed in extension of each other in the common transport direction of the materials, and the front end of a flight which is behind is connected to a duct which within the flight/flights ahead extends to the front end of the front flight.
2. Prior Art
Coextrusion is a generally known process which is used when it is desired to extrude an object which over its cross section comprises various materials. From the plastic industry it is thus known to coextrude profiles, in which various parts of the profile for instance have different hardnesses. From the food industry it is for instance known to coextrude paste like canelloni, i.e. paste tubes with stuffing.
In some of the known machines for coextrusion separate extruders are used for extrusion of the individual materials, which are each conveyed to a common extruder head, in which the desired profile with the desired distribution of material is provided.
Extruders are known, in which the two flights are mounted one within the other, see for instance U.S. Pat. Nos. 1,647,683, 2,764,780 and 2,769,201.
Furthermore, an apparatus is known from U.S. Pat. No. 1,265,853, which apparatus consists of two extruders placed in extension of each other, where the outlet from the rear extruder is passed coaxially through the worm member in the front extruder to the outlet of the latter. The two extruders are driven by a gear transmission by means of a single crank handle. There are no means for direct control of the ratio between the amount of material delivered from the two extruders.
OBJECT AND SUMMARY OF THE INVENTION
The object of the invention is to provide an extruder for coextrusion, in which the need for use of separate extruders for the individual materials is eliminated, and where there is a possibility of adjusting the ratio between the extruded amount of the individual materials.
This is attained according to the invention by means of an extruder of the type mentioned by way of introduction, which extruder is characteristic in that several flights for different materials are provided in a single worm member and that within the mantle at a flight an axially displaceable reversal member for controlled rerouting of extruded material is provided.
In a first embodiment, the duct extends backwards from the point for connection with the front end of the flight behind to the inlet of the flight behind, where the duct is also connected with the flight. An axially displaceable member in the duct comprises a wall adapted by axial displacement to connect the front end of the flight with the forward facing and/or backward facing part of the duct. Hereby it becomes possible to rerout the material conveyed by the flight behind back to the inlet of the flight, the possibility of controlling the amount of material conveyed by the flight behind being thus provided.
In a second embodiment, a flight is conically tapering and a corresponding conical, surrounding mantle portion is axially displaceable relative to the flight. Hereby it becomes possible to adjust the gap between the windings of the flight and the surrounding mantle, whereby it becomes possible to reroute part of the material conveyed and to consequently adjust the amount of material discharged from the flight.
In a further embodiment the conical mantle portion is fixed against rotation relative to the housing of the extruder and adapted to be axially displaced by means of an internally threaded union which is axially movable relative to either the extruder housing or the conical mantle portion and axially fixed relative to the other one of these two.
Extruded articles like paste are normally cut up in pieces of a predetermined length, for which reason at the o
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Megabite ApS
Simone Timothy F.
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