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Paper Machine
The flow of stock is supplied to the machine from the machine chest via the fan pump. A flow spreader uniformly distributes the stock into the paper machine headbox. The headbox delivers an uninterrupted, uniform flow of paper stock onto a moving forming fabric or “wire”. The forming fabric supports the wet stock as water is drained off from the under side of the fabric.The paper sheet is conveyed through a series of presses where additional water is squeezed out and the paper fibers are forced together. Residual water is removed by steam heated roll presses in the drying section. Fiber to fiber bonds are developed as the paper is pressed between steam heated rollers as the water content decreases from 50% to 5-10%. Final pressing and surface smoothness is achieved by calendering the paper via a series of polished steel roll presses. After calendering, the paper may be slit into specific widths, re-reeled, and shipped to the end user.
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Process Related Products
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Process Related Product Case Histories
Case History Report:
CHS20041005-0001
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Problem: “Stickies” build up on the dryer fabrics reducing permeability. This affected machine speed, paper quality, moisture profile as well as steam efficiency. The black deposits had reduced the ability to dry the paper to the point where the mill considered replacing the fabrics at a cost of $50,000. They had tried to clean the fabrics with many cleaners but were unable to restore the permeability.
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