Method of making a stratified paper
AssigneeInternational Paper Company
InventorsChang Shin Park, Hanjian Xu
Life of this patent
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Abstract
The present invention provides a method making stratified paper by redistributing the pulp suspension inside the headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.
Claims24
A method of making a stratified paper comprising the steps of:
- (a) introducing a pulp fiber suspension into a headbox of a paper making machine, said which-headbox comprising a single layer zone and having at least one ultrasonic means in proximity to said single layer zone;
- (b) subjecting said pulp suspension inside the single layer zone of the headbox to acoustic radiation forces produced by said ultrasonic means;
- (c) causing the pulp suspension in the single layer zone to separate into two or more fractions according to the relative sizes of the fibers;
- (d) depositing said pulp suspension onto a wire;
- (e) draining said pulp suspension;
- and (f) drying said pulp suspension.
A method of making a stratified paper comprising the steps of:
- (a) introducing a pulp fiber suspension into a single layer headbox of a paper making machine, which headbox has at least one ultrasonic means;
- (b) subjecting said pulp suspension inside the headhox to acoustic radiation forces produced by said ultrasonic means;
- (c) causing the pulp suspension to separate into two or more fractions according to the relative sizes of the fibers;
- (d) depositing said pulp suspension onto a wire;
- (e) draining said pulp suspension;
- and
- (f) drying said pulp suspension.
Dependencies are inferred from the claim text.