Developments in Magazine Printing by Pira International Ltd

By Pira International Ltd

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Processing variables include: dwell time, bleach temperatures and the condition of the unbleached fibre. Stock preparation Stock preparation embraces the whole sequence of final processes that must take place to redisperse the pulp, add to it any chemicals or other loadings or fillers needed, and bring it to the final furnish (recipe) and consistency required for the papermaking machine. e. one in which the pulping and papermaking facilities are on the same site), finished pulps are kept liquid and pumped to the stock preparation area of the paper mill.

The design of machine used for practically all paper production is the Fourdrinier. A typical machine is about the length of two football pitches and around four metres wide. These machines have two main process areas: a wet end consisting of a wire section and a pressing section, and a dry end consisting of a dryer section and a calender section. Wet end At this stage the stock is 99% water, and 1% fibre and filler. It is delivered uniformly on to a moving mesh belt through a head box (flow box).

In their natural state, wood fibres consist of long, narrow tubes composed of cellulose, hemicellulose – a compound similar in nature to cellulose and lignin – a resinous compound that binds the fibres together. The cellulose-based constituents are required for making paper, and the lignin constituents are impurities that must be removed during pulping. The aim of pulping is to separate the fibres in the raw material and allow the cellulose fibres to form a free suspension in water. Pulping Three basic methods of pulping wood fibre can be used – mechanical pulping removes the lignin from the fibres by physical means, mechanical/chemical pulping removes it by a mixture of physical and chemical means and chemical pulping by entirely chemical methods.

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