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US 2009/0266483 A1Published application
Corrugated paperboard and adhesive
AssigneeOel Chemical & Supplies, Inc.
InventorsJimmie Franklin Messenger, Shawn Messenger, Sharlan Wilkins
Life of this patent
Estimating the term…
Abstract
A cross-linked starch adhesive for use in producing moisture resistant wax free corrugated paperboard and the recyclable paperboard produced using the adhesive.
Claims11
A method of preparing starch based adhesive for producing wax free corrugated paperboard without moisture resistant coatings comprising the steps of:
- a) heating a solution of polyvinyl alcohol (PVA) to a temperature in the range from about 180° F. to 220° F. and holding said solution at said temperature for at least about 60 minutes;
- b) cooling said solution to a temperature in the range of about 90° F. to about 100° F.;
- and
- c) mixing said cooled PVA solution with about an equal amount by weight of a aldehyde ketone resin solution having solids in the range of about 50 to 70 wt % to produce a PVA additive composition;
- and,
- d) combining said PVA additive in a minor amount with an adhesive starch batch of a minor amount of modified starch and a major amount of pearl starch that is subsequently heated to a gel condition to produce an improved adhesive.
3 more elements
A method of making a moisture resistant paperboard without a moisture resistant coating comprising the steps of:
- a) providing a PVA additive comprising poly-vinyl alcohol and ketone-aldehyde resin;
- b) providing an acid modified carrier starch, and a cross-linking agent;
- c) blending the PVA additive, the carrier starch and the cross linking agent in a minor portion with a major portion of a pearl or modified starch and thereafter heating the blended composition to about 142° F. and a viscosity of about fifty seconds (Steinhall) to form an adhesive;
- d) applying the adhesive to form a glue line along tips of flutes of a corrugated paperboard strip, the glue line having a width in the range of about 0.080″ to about 0.140″ and;
- e) applying a flat sheet of paperboard under pressure at a temperature of about 220° F. to contact the adhesive on the flue lines on the flutes thereby forming the high strength, moisture resistant, paperboard product that is free of wax or other moisture resistant coatings.
2 more elements
Dependencies are inferred from the claim text.