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Sifters help control molded wood product quality.


Bemis Mfg. Co. has substantially reduced blemishes in its molded wood products since installing new centrifugal sifters at its contract wood division in Sheboygan, Wis.

Using compression mold presses, the company converts a mixture of wood particles, which has the consistency of flour, and urea formaldehyde resin into a wide range of products including cabinet components, table tops, croquet balls and toilet seats. In an effort to allow its mills to run at full capacity, cut the number of rejects and reduce costs associated with machining rough surfaces caused by oversized wood particles sneaking into the wood compression process, a scalping system was installed to ensure that only particles smaller than 0.015 inch are used.

At the heart of the scalping operation are six Centri-Sifter Centrifugal Sifters from Kason Corp. They process about 1,100 pounds of particles each hour up to 24 hours per day. The units scalp oversized particles from the blending process; overs are recycled back into the mills. Both hardwoods (except oak due to its high tanic acid levels) and softwoods are used.

Jeff Trowbridge, director of plant engineering, said the molded wood products ensure that more of every tree cut can be put to good use and there are never any week spots due to knots, checking or imperfections that solid wood can exhibit.

"The sifting system has made a noticeable difference in product quality and consistency," Trowbridge said.

PHOTO : Kason sifters are used to scalp over-sized wood particles for recycling.
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Copyright 1991, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Publication:Wood & Wood Products
Date:May 1, 1991
Previous Article:CNC moulder helps put Woodsmith on time.
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