Corrugation adhesive, corrugated board, and preparation methods therefor
AssigneeGrain Processing Corporation
InventorsRoger McPherson, Arthur G. Schmidt, Richard L. Antrim
Life of this patent
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Abstract
Disclosed is a method for the preparation of a corrugating adhesive. The method includes the steps of partially depolymerizing a hemicellulose precursor that comprises the soluble phase of an extract obtained from a hemicellulose-containing plant source, and mixing the partially depolymerized hemicellulose with starch to form an adhesive composition. The adhesive composition of the invention exhibits superior shear stability properties as compared with prior art adhesive compositions that incorporate pasted starches, and exhibits superior green tack as compared with other hemicellulose-based adhesives. Also disclosed are a corrugated board and a method for preparing same.
Claims26
A method for preparing an adhesive composition, said method comprising the steps of:
- hydrolyzing a hemicellulose-containing plant source by heating an alkaline aqueous suspension of said plant source to thereby form a hemicellulose-containing soluble phase and an insoluble phase;
- substantially separating said hemicellulose-containing soluble phase from said insoluble phase;
- partially depolymerizing at least a portion of the hemicellulose in said hemicellulose-containing soluble phase to produce a partially depolymerized hemicellulose-containing phase;
- optionally separating water from said partially depolymerized hemicellulose-containing phase;
- and
- adding starch to said partially depolymerized hemicellulose-containing phase in the presence of a liquid carrier under alkaline pH conditions to thereby form an adhesive composition.
A method for preparing an adhesive composition, said method comprising the steps of:
- providing a hemicellulose;
- partially depolymerizing at least a portion of said hemicellulose to produce a partially depolymerized hemicellulose;
- and
- adding starch to said partially depolymerized hemicellulose in the presence of a liquid carrier under alkaline pH conditions to thereby form an adhesive composition.
A method for preparing an adhesive composition, the method comprising the steps of:
- extracting hemicellulose from a hemicellulose-containing plant source by heating said plant source in an aqueous carrier at a temperature of at least about 200° F. under alkaline conditions to form a hemicellulose solution;
- separating insoluble components from said hemicellulose solution to form a hemicellulose-rich phase;
- partially depolymerizing at least a portion of the hemicellulose in said hemicellulose-rich phase to produce a partially depolymerized hemicellulose-rich phase;
- and
- mixing said partially depolymerized hemicellulose-rich phase with starch to form an adhesive composition.
An adhesive composition comprising water;
- caustic;
- starch;
- and the extracted soluble phase of a hemicellulose-containing plant source, at least a portion of the hemicellulose in said hemicellulose-containing plant source being partially depolymerized.
Dependencies are inferred from the claim text.