Column press for quality analysis
The invention relates to a method and equipment for the testing of quality of polymer-bound rubber additives. According to the method, a polymer-bound rubber additive ( 3 ) is mixed with an EPDM masterbatch ( 2 ). The resultant test mixture ( 5 ) is forced through a test sieve ( 10 ), and the number of undispersed particles ( 14 ) removed by sieving is determined.
1. A method for quality testing a polymer-bound rubber additive comprising the steps of:
mixing the polymer-bound rubber additive with a test masterbatch to form a test mixture;
forcing the test mixture through a test sieve thereby forming a filtered test-mixture fraction and a sieve cake faction, wherein the filtered test-mixture fraction is that portion of the test mixture that passes through the test sieve and wherein the sieve cake faction is that portion of the test mixture which does not pass through the test sieve and wherein said sieve cake faction comprises undispersed particles; and
subsequently determining the number of undispersed particles in the sieve cake faction.
2. The method according to claim 1 ,
wherein the forcing step is performed with the aid of a piston and a cylinder in which said piston is capable of moving within said cylinder and capable of applying a force to any substance within said cylinder so as to displace said substance from the cylinder, and
wherein, said test sieve is positioned adjacent to said cylinder so as to receive and filter any substance forced through said cylinder via the piston, and
wherein the test mixture is positioned within the cylinder and the piston applies force to the test mixture within the cylinder.
3. The method according to claim 2 , further comprising:
heating the test mixture prior to or during the mixing step, thereby forming a heated test mixture;
prior to said forcing step, forming the heated test mixture into a shape capable of fitting within the cylinder, thereby forming a formed test mixture and inserting the formed test mixture into the cylinder.
4. The method according to claim 3 , wherein the forming step is performed via the use of at least one roller.
5. The method according to claim 2 , wherein a plurality of sieves and/or of plates are arranged adjacent to one another behind the test sieve, in relation to the direction of force being applied to any substance within the cylinder via the piston, and wherein the mesh size of each of the plurality of sieves increases in the direction of said force.
6. The method according to claim 5 , wherein a ring is positioned in front of the test sieve, in relation to the direction of force.
7. The method according to claim 5 , wherein the test sieve has a mesh width of not more than 150 μm and wherein the mesh widths of the plurality of sieves are greater than 150 μm.
8. The method according to claim 1 , wherein said mixing step is performed via a double-roller system.
9. The process according to claim 1 , wherein the test masterbatch is an EPDM masterbatch.