VIB Tech Dictionary

(1) A vacuum filter used to recover fines and fillers from white water.
(2) A device which screens paper fibers from water. Used to save pulp which might otherwise be lost to the saver.

SC grades, SC A – and SC B, are uncoated high-quality magazine papers. Depending on the quality they have different furnish and ash content. They are used in a color printing press with high throughput and quality. Today the lower quality is produced on-line with soft calenders or for higher gloss with on-line multinip calenders. Higher quality grades, SC A and SC A+ are produced with off-line calenders.

Foreign material on the surface of the paper.

The process of producing a work schedule.

A device used to separate undesirable objects from pulp.

Centrifugal perforated screens used to separate fibers and foreign materials and also to deflocculate fiber bundles and lumps.
After passing through the centriscreen, the stock goes immediately to the head box.

Chest which contains the drop leg lines that seal the vacuum of the suction boxes.

Variable speed stock delivery pump to the head box. The speed of the pump controls the amount of water to the head box.

A pulp produced by a mild chemical treatment of the raw material followed by a mechanical fiberizing operation.

The time an employee has been employed in the mill, a department, and line of progression.

A pressure vessel used to collect condensate from dryer sections. The condensate then separates into flash steam and condensate.

Rolls of paper wound to specific and identical diameters on the winder.

A pipe or channel, usually closed but not normally full, which is used to carry waste water.

Making a paper sheet having the same shade of color as a sample by addition of the proper amounts and types of dyes to the fiber furnish.

A mechanical device which causes the fourdrinier foils to oscillate in the cross machine direction for formation purposes.

A pulley generally mounted on a shaft. Mill usage of the word is usually in connection with drives or ropes on the paper machine.

After the web of paper forms on the wire, it is commonly referred to thereafter as the sheet.

A small bundle of wood fibers that have not been separated completely in the pulping operation.

The process of stopping the operation of a machine.

Used to prevent glue as well as adhesive pastes and substances from sticking. By coating the paper with silicone, an adhesive paper is created with a surface that is non-adhesive to most substances. It is primarily used for self-adhesive papers and foils e.g. for manufacturing of labels.

The use of a single dryscreen (or dryer felt) in the first section of dryers. Lessens sheet flutter more than normal top and bottom felt design.

A material which is added to paper to give it water-resisting properties. Can be rosin size added at the wet end or surface size (starch) added at the size press.

(1) Two rolls forming a nip which contains liquid starch. The nip pressure forces starch into the paper as it passes through the starch and nip.
(2) Section of paper machine where surface treatments, such as a starch solution, are applied to the sheet of paper to give it special qualities.

The method of removing cull paper from a roll.

A type of pine.

The variable opening of the head box which the stock flows through to reach the wire.

A biological growth or chemical deposit found in certain mill areas.

A chemical additive that kills and controls the growth of slime.

(1)Spots or smears caused by fungi or bacteria growth.
(2) Semi-transparent spots produced in paper. They are caused by micro-organisms (plants or animals) which have grown in one of the many wet spots around the wet end of a paper machine. Eventually they may get into the paper on the wire. Although these spots are sterilized by the dryers, they are unsightly and may leave holes in the paper.

A sharp metal disc used to cut paper into desired widths on winder and rewinder.

Dried pulp that is repulped at the dryer for paper machine furnish.

The texture of the surface of paper, also called its "finish".

Steamshower for the on-line calender.

Used to describe the appearance of paper with a wild, non-uniform formation.

Pulp made from deciduous or broadleaf trees, such as poplar, by the soda process.

NaCL used in starch make-up (salt).

Term applied to trees of the needle-leaf types such as pine.

A metallic core surrounded by an electric coil and caused to move by magnetism as the coil is electrically charged.

The material in a water solution.

The metal cylinder which the paper reel is wound around.

A high crowned roll used to spread the paper web.

Nozzles on the front and back of the machine usually before the couch. They cut a strip of paper off the sheet edge by means of high-pressure water.

Refers to swimming rolls. These rolls are controlled crown rolls.

An amount of material, labour, of other measurable entities used in the production of a given amount of pulp, paper, or finished goods based on historical records.

(1) A powdered product derived from corn or other vegetables; used as a solution in water for internal or surface treatment of paper to improve its properties.
(2) Material which is used as a sizing for paper. Usually made from corn.

Electrical charge which may exist in paper which has been improperly dried or has sustained excessive pressure in calendering. It is particularly apparent in paper which is too dry, but it can also exist in properly dried paper which has become affected by local atmospheric conditions after shipment.

Steamshower for the Fourdrinier or press section of a paper machine.

A mechanical device for separating steam from condensate in a pipe line.

Diluted or wet pulp at any stage in the manufacturing process.

The area where chemical additives are prepared for addition to paper furnish.

A number assigned to each different storeroom item.

The department head responsible for the storeroom.

High-priority maintenance items which are kept in stores inventory to provide ready access by the mill.

Steel bands used for strapping skids and pallets of cartons.

Visible lines in the sheet caused by uneven drainage or roll marks.

A valve on the discharge end of the fan pump to control the amount of water going to the head box.

A mill term referring to a device for adjusting the tension on paper machine clothing.

The elongation of a strip of paper when subjected to pulling. The term is colloquially but incorrectly used to indicate expansion caused by moisture absorption of a sheet of paper.

A term which describes the papermaking material when ready for the paper machine. Also called stock.

A receptacle for stock placed above the machine to allow the stock to flow under gravity into the fan pump supplying a constant head on the weight valve.

The weight in pounds of a ream (either 480 or 500 sheets) of paper cut to a given size. The standard size ream varies with different grades of paper according to trade customs. For fine papers the standard ream consists of 500 sheets 17 x 22 inches. The weight of this ream is known as the "substance weight".

(1) Box inside a suction roll for the purpose of water removal by means of vacuum.
(2) A device at the wet end of the machine which removes water from the paper web. It is located under the wire and removes water by means of a vacuum pump.

Perforated roll allowing the forces of vacuum to remove water from a wet felt.

Alkaline process of cooking pulp. More often referred to as the kraft process. The pulp cooked by this process.

Acid process of cooking pulp. The pulp cooked by this process.

A series of boiler tubes through which steam is passed to increase the steam temperature above the saturation temperature.

All items that are necessary for the production of paper, but do not add anything to the paper itself.

A heat exchanger which condenses the evaporator vapor in the tubes of the exchanger using cold mill water in the shell.

Paper that has been treated with starch or other sizing material at the size press of the paper machine. This term is used interchangeably with the term "tub-sized" although tub-size more properly refers to surface sizing applied as a separate operation where the paper immersed in a tub of sizing (starch or glue), after which it passes between squeeze rolls and is air dried.

A pressurized chamber, located on top of the head box which dampens any pulsations in the stock flow.

A measure of the quantity of filterable solids which are present in a water suspension.

A dryer which uses steam for drying or that can be cooled with water for the purpose of curl control.

Stock discharged from primary refiners into the blend chest. It is used to thicken the water from the couch pit before it goes into the save-all vat. Sweetener acts as a filter pad on the save-all discs and aids in the retention of fines and fillers of the white water system that pass through the save-all.

A tube placed inside a dryer to remove condensate.