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Categories: Book printing >> Support Center
Corrugated Materials (Liner and Medium)
Origin:Image Printing  Data: 3/14/2011  Keywords: Liner and Medium printing

Compared with the paper subject to how a book printing job performs, the liner and medium materials are also important to corrugated materials. The liner made from virgin material is called Kraft liner. However, many Kraft liner grades also include some fibers from corrugated board manufacturing, so-called clippings obtained from trimmings in the corrugated board manufacturing process collected from retail stores. The fibers coming from these sources are recycled fibers.

Recycled fibers must be a minimal proportion of the total amount of fibers present for the sheet to be called Kraft liner. Liner consisting only of recycled fibers is called test liner. The recycled material may be of different quality in different grades, it may come from corrugated board plants, from stores, offices or households. Paper derives its physical strength from the inter-fiber bonding forces. When paper is recycled the fibers become shorter and the opportunity for inter-fiber bonding forces is reduced, hence the reduction in strength with each recycling operation. Recycled fibers are usually of lower quality and are traditionally weaker than virgin fibers due to impurities which have entered the materials when used for corrugated board packages. When the fibers are reused, the paper properties change due to these impurities. At each recycling the paper strength decreases and at the same time the amount of impurities increasing. Depending on the resources, the degree of impurities vary more usage gives more impurities.

Recycled of corrugated board is common practice. This means that today a great deal of corrugated board materials is made from 100% recycled material. The number of times a fiber can be reused depends on its strength and the demands on cleanliness.

Papermaking, regardless of the scale on which it is done, involves making a dilute suspension of fibres in water and allowing this suspension to drain through a screen so that a mat of randomly interwoven fibres is laid down. Water is removed from this mat of fibres by pressing and drying to make paper. First the fibres are suspended in water to form a slurry in a large vat. The mold is a wire screen in a wooden frame (somewhat similar to an old window screen), which is used to scoop some of the slurry out of the vat. The slurry in the screen mold is sloshed around the mold until it forms a uniform thin coating. The fibres are allowed to settle and the water to drain. When the fibres have stabilized in place but are still damp, they are turned out onto a felt sheet which was generally made of an animal product such as wool or rabbit fur, and the screen mold immediately reused. Layers of paper and felt build up in a pile then a weight is placed on top to press out excess water and keep the paper fibres flat and tight. The sheets are then removed from the post and hung or laid out to dry. A step-by-step procedure for making paper with readily available materials can be found online packaging printing.

When the paper pages are dry, they are frequently run between rollers (calendered) to produce a harder writing surface. Papers may be sized with gelatin or similar to bind the fibres into the sheet. Papers can be made with different surfaces depending on their intended purpose. Paper intended for printing or writing with ink is fairly hard, while paper to be used for water color, for instance, is heavily sized, and can be fairly soft. The wooden frame is called a deckle. The deckle leaves the edges of the paper slightly irregular and wavy, called deckle edges, one of the indications that the paper was made by hand. Deckle-edged paper is occasionally mechanically imitated today to create the impression of old-fashioned luxury. The impressions in paper caused by the wires in the screen that run sideways are called laid lines and the impressions made, usually from top to bottom, by the wires holding the sideways wires together are called chain lines. Watermarks are created by weaving a design into the wires in the mold. This is essentially true of Oriental molds made of other substances, such as bamboo. Hand-made paper generally folds and tears more evenly along the laid lines. Hand-made paper is also prepared in laboratories to study papermaking and to check in paper mills the quality of the production process. The handsheets made according to TAPPI Standard T 205 are circular sheets 15.9cm (6.25in) in diameter and are tested on paper characteristics as paper brightness, strength, degree of sizing.

UP -- Strength Requirements of Recycled Paper
Next -- Corrugated Materials (Virgin Fibers)
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As a professional book printing factory in China, Image Printing Packaging Ltd focus on book printing and packaging printing mainly for oversea and domestic customers. We are located in Shenzhen city, the book printing and packaging printing industrial center of China and even worldwide. Please be kindly note we offer a wide range of professional customed printing service with aggressive prices
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