Device for preparing a glue for corrugated board
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United States of America Patent
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May 16, 2000
Issued Date -
N/A
app pub date -
Jun 16, 1999
filing date -
Sep 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a process for the preparation of a starch based glue for making corrugated board. The process is carried out in a system which includes a first and relatively large mixing vessel containing a stirrer. A second and smaller mixing vessel is connected to the first vessel via a recirculation path. The second and smaller mixing vessel contains means for exerting a shearing force which is greater than the shearing force exerted in the first and larger mixing vessel. The process is carried out in two steps. A first step is to make a carrier by combining water, starch and a limited amount of lye in the large vessel. A second step adds further amounts of starch, water, borax, and a second shot of lye to the carrier while in the small vessel. Adding lye in two steps is a principal aspect of the invention. If all lye is added in one step, it must be limited to an amount which does not prematurely gelatinize the starch to a level which defeats the glue making.
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