Wet end starch application

Details Wet end starch application Wet end starch application

1997-10-03

1999-11-16

Chin, Peter

Coating apparatus

Projection or spray type

Flexible web or strand work

118602, 118667, 118689, 118690, 162184, 162186, 162265, 162266, 4253781, B05B 1302

Patent

active

059850302

ABSTRACT:
A method of applying a starch sizing to a forming web on a paper machine, such as in the form of a curtain on a fourdrinier machine, employs a suspension of uncooked particulate starch and water which is applied, as a suspension, to the inlet of a downwardly opening die positioned over the forming web and applied at a consistency of between about 2 to 10% onto the surface of the web as a free falling curtain, the impact velocity of which is controlled to a rate sufficiently low to prevent distortion of the web on impact. Improved drainage is achieved by heating the suspension to a temperature less than about 150.degree., to prevent the cooking of the starched particles. The curtain may be applied to the web at fourdrinier table consistencies as low as about 2% and still obtain starch retention rates of about 80%.
An improved coater die for applying a curtain of finely divided material carried as a suspension, such as uncooked starch, on the surface of a newly formed web of paper material has an elongated die body formed as a pair of mating die body portions. The portions define opposed land surfaces which define an extrusion slot. A suspension feed passageway is formed through the die body in communication with the slot and is formed with ends which terminate exclusively at one of the die body portions thereby eliminating the need for a conventional die body end plate. The die lips are chilled to produce a sweating on the surface by moisture condensation for preventing a build up of coating particles at the die lips which would interrupt the integrity of the coating curtain. The feed-through passageway is tapered or reduced in cross section between the inlet and the outlet to maintain a turbulent flow condition therethrough to maintain the particulate material in suspension within the die body.

REFERENCES:
patent: 874946 (1907-12-01), Eichhorn et al.
patent: 1538582 (1925-05-01), Olander et al.
patent: 1903236 (1933-03-01), Johnsen
patent: 2325574 (1943-07-01), Wunderer
patent: 2330282 (1943-09-01), Hazeltine et al.
patent: 2373914 (1945-04-01), Quinn
patent: 3767346 (1973-10-01), Mihalik
patent: 3919042 (1975-11-01), Spiller
patent: 3992252 (1976-11-01), Coleman
patent: 4093016 (1978-06-01), Coleman
patent: 4230743 (1980-10-01), Nakamura et al.
patent: 4355762 (1982-10-01), Coleman
patent: 4559896 (1985-12-01), Bossard et al.
patent: 5044305 (1991-09-01), Shibata et al.
patent: 5149341 (1992-09-01), Taylor et al.
patent: 5433826 (1995-07-01), Glomb et al.

Affiliated with

Also associated with

Rating

Wet end starch application does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Wet end starch application, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wet end starch application will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1319045