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nature : Papermaking certain industrial technology of a paper process. So moist paper or oil-soaked water when fully able to maintain the mechanical strength. Commonly used urea - formaldehyde, melamine and other synthetic resin wet strength agent. Preparation into its acidic glue (such as melamine resin), or 10% diluted solution (such as urea - formaldehyde resins), or Beating paper, pulp accession, and to control the acidity, hot and dry, so the fiber polymerization occurred between paper and increase the intensity of wetlands. Urea formaldehyde resin can be used for surface treatment.
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