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Coating with deformable and permeabl...

Brethour, James Michael.

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Coating with deformable and permeable surfaces: Focus on rotary screen coating.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Coating with deformable and permeable surfaces: Focus on rotary screen coating./
Author:	Brethour, James Michael.
Description:	336 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1364.
Contained By:	Dissertation Abstracts International64-03B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083265

Coating with deformable and permeable surfaces: Focus on rotary screen coating.
Brethour, James Michael.

Coating with deformable and permeable surfaces: Focus on rotary screen coating. - 336 p.

Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1364.

Thesis (Ph.D.)--University of Minnesota, 2003.

Rotary screen coating and printing are accomplished with a thin metal cylinder perforated by an array of holes to form a screen that may be patterned. This is so mounted and rotated in a coating apparatus that liquid fed into its interior is forced through the holes by a fixed flexible blade. Outside the screen the liquid issuing from the holes forms a coating bead between screen and substrate carried on a backing roll; at its downstream meniscus the bead delivers the coating (direct rotary screen). Alternatively, the bead is between the screen and a transfer roll that receives the coating and delivers it to the substrate in another roll nip (indirect rotary screen).Subjects--Topical Terms:

1018531
Engineering, Chemical.

Coating with deformable and permeable surfaces: Focus on rotary screen coating.
LDR:03200nmm 2200301 4500 001 1865651
005 20041222104206.5
008 130614s2003 eng d
035 $a (UnM)AAI3083265
035 $a AAI3083265
040 $a UnM $c UnM
100 1 $a Brethour, James Michael. $3 1953081
245 1 0 $a Coating with deformable and permeable surfaces: Focus on rotary screen coating.
300 $a 336 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1364.
500 $a Adviser: L. E. Scriven.
502 $a Thesis (Ph.D.)--University of Minnesota, 2003.
520 $a Rotary screen coating and printing are accomplished with a thin metal cylinder perforated by an array of holes to form a screen that may be patterned. This is so mounted and rotated in a coating apparatus that liquid fed into its interior is forced through the holes by a fixed flexible blade. Outside the screen the liquid issuing from the holes forms a coating bead between screen and substrate carried on a backing roll; at its downstream meniscus the bead delivers the coating (direct rotary screen). Alternatively, the bead is between the screen and a transfer roll that receives the coating and delivers it to the substrate in another roll nip (indirect rotary screen).
520 $a Experiments were performed to measure the average coating thickness delivered, the length of the coating bead, and the nature of the film splitting at its downstream meniscus. The thickness was most strongly affected by the tip-to-nip offset, i.e. the circumferential distance between the blade tip inside the screen and the nip, or minimum clearance, between screen and backing roll. Contrastingly, the blade loading, i.e. how strongly the blade was pressed against the inner screen surface, only weakly affected coating thickness. But loading did influence the coating bead's length---and thereby the film-split and the uniformity of the coating delivered by the split.
520 $a The process was modeled by splitting it into two parts: blade coating-like flow inside the screen and the roll coating-like flow outside. One-dimensional lubrication and two-dimensional Navier-Stokes flow models were developed for both flow regions. Liquid flux through the screen between them was represented by Darcy's Law. The models predicted fairly well the measurements and elucidated the main features though not the details of the film-splitting.
520 $a In addition, deformation of and flow in permeable, deformable substrates were described theoretically by adapting Biot's (1972) poroelastic model. The equations were solved for the wetpressing process, wherein a saturated porous and deformable sheet is pressed between two rollers to extrude much of the liquid. Interestingly, in regions of highest interstitial pressure within the pores, the material is predicted to swell even though the adjacent material is predicted to be compressed.
590 $a School code: 0130.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Applied Mechanics. $3 1018410
690 $a 0542
690 $a 0346
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 64-03B.
790 1 0 $a Scriven, L. E., $e advisor
790 $a 0130
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083265