Coaters and Size Presses

Thursday, 18 November 2010 16:43
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Coating and Sizing Equipment

More Information Purpose:
  • Improve strength, surface and/or printing properties of paper & board.
  • To add pigments to the surface of the web.

Coaters & size press equipment apply the pigments & chemicals to the surface of the web. For most applications the web is 90+% dry. The pigments & chemicals bond to the web during the subsequent drying process sufficiently to withstand any later operations/uses. This results in high performance of the paper/board product at the lowest possible cost.

  • Tissue uses a number of different chemicals to enhance softness/texture, improve strength and improve absorption characteristics. Examples of this include aloe-impregnated tissue and chemicals that improve the wet strength of name brand towels.
  • Linerboard uses starch to improve the stiffness and/or strength of boxes.
  • Coated paper products apply pigments & binders to the surface to enhance the printing characteristics. Examples of this inlude popular magazines such as National Geographic, TIME, Newsweek, posters for advertising, and corporate brochures.
  • Fine (copy) paper uses various pigments & binders to enhance the printing characteristics. An example of this is inkjet printing paper.
  • Coated board products are used for advertising the product, ensuring minimal damage during transportation and water barriers. Examples of this include cereal boxes, packaging of various commercial products, beverage & food containers and Fedex containers.

Categories:

Coaters

Coaters generally indicate that coating is being applied to the web surface. The coating is gerneally defined as having pigments & binders along with many other chemicals. Coating solids can vary from ~30% to over 70% dry. A simplified example of coating is common latex house paing. Historically paper machinery coaters have used a metering device to control the amount of coating applied to the web. The metering device is either air, a rod or a blade. Newer technologies have been commercialized in the last 20 years that do not require air, a rode or a blade.

Size Presses

Size presses are generally defined as transferring a film from a roll to the web. There is a wide variety of films applied with size presses. They range from water to corn starch at ~10% solids, to cating at 64% solids to many other chemicals & solutions at varying solids. There are a wide variety of metering elements ranging from rolls, grooved or smooth rods and blades. Newer technologies in the last 20 years use fiddferent methods to transfer the film to the web.

Benefits of Paperchine's Designs

  • Years of experience with coating & size press design, installation, startup, operation, service & process knowledge.
  • We have the largest group of coater & size press engineers & service personnel in North America.
  • Our engineers have worked for many of the leading paper machinery OEMs.
  • We are willing to work with customers to find solutions that meet their needs & incorporate their ideas. We are willing to try new ideas & learn new ways to solve problems more efficiently.
  • Our equipment often is substantially less expensive than our competitors.