mulling


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mulling

[′məl·iŋ]
(engineering)
The combining of clay, water, and sand, prior to molding, by compressing with a roller to ensure development of optimum sand properties by the adequate distribution of ingredients.
References in periodicals archive ?
This is especially true when hard water, hot return sand, high sodium bentonite or short mulling times are involved.
This is because calcium bentonite develops strength faster than sodium, allowing for shorter total mulling times to reach compactibility targets.
Material percentages in green sand (methylene blue clay, moisture, grain size distribution, volatiles and combustibles) are all independent of mulling.
If mulling is not adequate, the system may be using excess water to reach the target compactibility.
The thought process behind this practice is to attempt to minimize new material additions and maximize cumulative mulling.
The inventory (mass balance) control method, enhanced by the novel developments this industry has seen in the last two decades (sand mulling, core-and moldmaking, shakeout and sand reclamation) is promising and deserves to be studied, evaluated, developed and applied.
Effective mulling can be defined as achieving the maximum amount of work on the sand during the time it stays in the machine.
Effective clay is the portion of the live clay activated by mulling and contributing to bonding.
In turn, this also will cause the system to become brittle, since the sand will have less cumulative mulling.
It would be expected that the nonautomated mulling system would have better control because the full-time operator is continuously checking and correcting for compactibility variation.
The sand mixture was consistently prepared by mulling a four-screen silica sand for 10 minutes with 7% bentonite.
Combined with water in the modern mulling process, each sand grain is smeared with a mixture of water and bentonite clay.