Abstract Apparatus for feeding mixtures to molten masses of synthetic polymers which comprises a storage container for the mixtures to be fed, a first unheated feed pump connected thereto, a supply line from said first unheated feed pump to a heating member, a second heated feed pump connected to the heating member, a feed inlet for the molten mass, said inlet connected to said second heated feed pump and downstream thereof, a third feed pump for the molten mass of polymer downstream of said second heated feed pump and said feed inlet, and a transfer mechanism from which each of the said three pumps is driven. The apparatus is useful for adding pigmented pastes as well as other dispersions and liquids to polymer melts, including such materials as antioxidants, modifiers, softeners, and others. Polymers used may include polyolefins, polyesters and polyamides.
The apparatus described in claim 1 wherein said second heated feed pump, the feed inlet, and said third feed pump for the molten mass of polymer are heated by means of a heating mantle enclosing said pumps and inlet. D1505
Claim 2
Dependent Claim
15 words
The apparatus described in claim 1 wherein each of the pumps is a gear pump.
Claim 3
Dependent Claim
31 words
The apparatus described in claim 1 wherein the storage container is provided with an inlet for pressurized gas for feed of a mixture stored therein to said first unheated feed pump.
Claim 4
Dependent Claim
28 words
The apparatus as set forth in claim 1, wherein said transmission mechanism is operatively connected to said first, second and third pumps and adjusts the respective velocities thereof.
Claim 5
Dependent Claim
38 words
The apparatus described in claim 5, wherein said second heated feed pump, the feed inlet, and the feed pump for the molten mass of polymer are heated by means of a heating mantle enclosing said pumps and inlet.
Claim 6
Dependent Claim
15 words
The apparatus described in claim 5, wherein each of the pumps is a gear pump.
Claim 7
Dependent Claim
31 words
The apparatus described in claim 5, wherein the storage container is provided with an inlet for pressurized gas for feed of a mixture stored therein to the first unheated feed pump.
Claim 8
Dependent Claim
115 words
A process for feeding a mixture to a molten mass of synthetic polymers comprising: the steps of pumping said mixture out of a storage container by means of a first unheated pump connected thereto to a heating member; pumping said mixture out of said heating member by means of a second heated pump connected thereto thereby accurately removing a predetermined quantity of said mixture; injecting sAid predetermined quantity of heated mixture into said molten mass of synthetic polymer while maintaining the latter in a heated state; pumping said heated molten mass of synthetic polymer and said mixture by means of a third feed pump to an outlet; and synchronizing said first, second and third pumps.