Paper Functional Chemicals- Specialty Paper Additives

2017-01-08T00:14:20+00:00 Categories: Chemical Additives|Tags: , , , , , , , , , , |

Read the Beginning of this article... 3.6.8 Additives for Specialty Papers [13, 14] Specific functional chemicals are indispensable in the production of specialty pa¬per grades. Such grades are expected to display a very heterogeneous range of properties. Specialty paper grades account for only ca. 4 % of worldwide paper production, but the proportion of chemicals [...]

Paper Functional Chemicals- Recycled Paper Additives

2017-01-08T00:14:20+00:00 Categories: Chemical Additives|Tags: , , , , , , , , , , |

Read the Beginning of this article... 3.6.7 Additives for Recovered Fiber Processing For economic and environmental reasons the use of recovered paper as raw mate¬rial has already reached a high level and will grow further. For its preparation specific chemicals are required, depending on the quality of the recovered papers and the necessary properties of [...]

Paper Functional Chemicals- Wet Strength Resins

2017-01-08T00:14:20+00:00 Categories: Chemical Additives|Tags: , , , , , , , , , |

Read the Beginning of this article... Wet Strength Resins (WSR) [2, 9–11, 21–24] Certain types of paper can only fulfil their purpose if they have adequate wet strength. Such papers include, for example, filter papers, hygienic papers, papers for bags, label papers, wallpapers, laminate base papers, packaging papers for moist goods and all papers which, [...]

Paper Functional Chemicals- Dry Strength Resins

2017-01-08T00:14:20+00:00 Categories: Chemical Additives|Tags: , , , , , , , , , |

Read the Beginning of this article... Dry-Strength Resins (DSR) [3, 9–11, 22–24] Some of the specific mechanical properties important for paper are tensile strength, tearing resistance, folding endurance, bending resistance, burst and sur¬face strength, internal bond and compression resistance. It is generally accepted that the major factors contributing to dry strength development in paper manu¬facture [...]

Paper Functional Chemicals- Sized Paper Requirements

2017-01-08T00:14:21+00:00 Categories: Chemical Additives|Tags: , , , , , , , , , , |

Read the Beginning of this article... 3.6.4.4 Requirements and Measurements of Sized Papers The purpose of sizing is to modify the surface of the fibers to control penetration of aqueous liquids into the paper. The penetration usually correlates with the ab¬sorbency, repellency (hydrophobicity), and spreading of the aqueous liquid con¬cerned. Control of these important properties [...]

Paper Functional Chemicals : Sizing Advice

2017-01-08T00:14:21+00:00 Categories: Chemical Additives|Tags: , , , , , , , , |

Read the Beginning of this article... 3.6.4.3 Application Advice . • Rosin: The average addition rate is 1 % solid calculated on paper, the individual rate depending on the required degree of sizing. With these products this degree can be adjusted very precisely and is fully obtained directly after the paper has been dried. The [...]

Paper Functional Chemicals : Synthetic Sizing Agents

2017-01-08T00:14:21+00:00 Categories: Chemical Additives|Tags: , , , , , , , , |

Read the Beginning of this article... 3.6.4.2.2 Synthetic Sizing Materials These were only developed in the second half of the last century. Driving forces have been the increasing use of the cost and performance effective calcium carbonate as filler and coating pigment and also the need to produce paper with high and permanent paper strength. [...]

Paper Functional Chemicals : Rosin Sizing Agents

2017-01-08T00:14:21+00:00 Categories: Chemical Additives|Tags: , , , , , , , , |

 Read the Beginning of this article... 3.6.4.2.1 Rosin-based Sizing Agents These are still the most widely used of all wet-end sizes, because they are cheap to produce and are produced from regenerative raw materials. They are mainly used in acid and much less in pseudo-neutral pH conditions. They have the advantage that the degree of [...]

Paper Functional Chemicals : Paper Sizing Fundamentals

2012-02-12T19:38:09+00:00 Categories: Chemical Additives|Tags: , , , , , , , , |

Read the Beginning of this article... 3.6.4.1 Fundamental Aspects of Paper Sizing Sizing makes the native fiber network hydrophobic and thus prevents or reduces the penetration of water or other aqueous liquids into the paper. Sizing prevents the spreading and strike through of ink or printing colors. Papermaking fibers have a strong tendency to interact [...]

Paper Functional Chemicals : Chelating Agents

2012-02-12T19:36:38+00:00 Categories: Chemical Additives|Tags: , , , , , , , , |

Read the Beginning of this article... 3.6.3 Chelating Agents – Complexing Agents [3–5] The presence of heavy metals negatively influences many production processes and paper properties. In particular, they interfere with the bleaching agents in chemical and mechanical pulp production, reducing their effect, so the task of chelating agents is to counteract this detrimental impact. [...]