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Packaging Grades

Collective term for paper of various pulp compositions and qualities. The only characteristic they may have in common is in their use. The variety and composition of the pulp depends on the demands required of the paper. Most importantly it should be tear, burst, crease and scrub resistant in addition to possessing elasticity and strength. Very often the paper must possess good printing qualities (packaging as an advertising medium). For special purposes the paper may also need to be made waterproof and water resistant, aroma or steam proof. For this, either special additives are added to the pulp, or the paper is coated or impregnated with synthetic materials and/or combined with metal foils. Thin packaging paper weighing less than 30 g/m² is called wrapping tissue paper.

Pallet

"A unit built to a specific size out of 4"" x 4"" blocks and 1"" x 4"" boards. Used for storage and shipments of paper."

Paper

A homogenous formation of primarily cellulose fibers which are formed in water suspension on the machine wire and bound together by weaving the fibers and by bonding agents. Originated as a medium of fluid writing.

Paper Machine

The machine upon which the fibers and other components of paper are formed, pressed, dried, calendered, wound on reels, slit into appropriate widths and wound into rolls, or cut into sheets in certain cases.

Perivac

A device used to remove entrained air from stock after cleaning and prior to sheet forming.

Ph

A measure of the acid or alkaline characteristics of a chemical obtained by measuring the hydrogen ion potential or the substance and assigning it a number from 1-14.

Ph Value

The degree of acidity of alkalinity measured on a scale from 0 to 14, with 7 as the neutral point. From 0 to 7 is acid; 7 to 14 is alkaline. Numerous instruments are available for measuring the pH value.

Pick-Up Felt

The wet felt that serves to transfer the sheet from the fabric to the press section.

Picking

The lifting of any portion of a paper surface during the printing impression, sometimes due to inadequate surface sizing and sometimes to ink being excessively tacky.

Pigment

An insoluble powder material used to color paper. Many pigments are mineral and inorganic compounds.

Pin Holes

Imperfections in paper which appear as minute holes when looking through the sheet. They originate from foreign particles which are pressed through the sheet.

Pitch

A resin-like material in wood pulp.

Planetary Gear Box

Gear reducer mounted directly on the bearing housing of a roll.

Point

A term used for an expression of thickness of a sheet of paper in one-thousand of an inch (.001”).

Press

Rolls through which the paper passes. By applying pressure to the rolls, moisture is squeezed from the sheet.

Primary Fan Pump

Stock delivery pump to the primary bank of cleaners.

Printing Press

Printing papers (magazine papers) are of high quality. Coated and uncoated papers are printed. Printing processes involve different press systems, such as rotogravure-printing, letterpress-printing and offset-printing.

Pucker

A cockle like surface effect on paper which has contracted unevenly during drying.

Pulp

(1)Fiber from which paper is made. (2) Papermaking material existing in a disintegrated fibrous wet or dry state. Before it is dispersed onto the paper machine, it is mixed, beaten and diluted to a consistency suitable for fabrication into paper.

Pulping

The operation of transforming pulpwood into a pulp which can be made into paper after suitable processing.