A burster was typically used with printed continuous form paper applications such as mass-mail advertising, invoices, and account statements. For the class of binary star, see X-ray burster.Ī burster is a machine that separates one-part continuous form paper into separate, individual, sheets along the transverse perforations. Direct mail, as an industry overall, has been accused of being environmentally unfriendly, due to a high percentage of the mail being discarded without being read. This will produce about 400 pages per minute, using about 8-11 large boxes of paper for every hour of printing (affected by character density, and other details such as paper weight). Continuous form paper is used in some of the fastest types of printing systems, some of which print text at a rate of 20,000 lpm (lines per minute). Reader's Digest and Publisher's Clearing House relied heavily on these forms to promote their products (most often via sweepstakes), issue billing, address form letter correspondence, and manage their own business data needs. Printing on continuous forms was at one time the basis for many business operations, not the least of which the direct mail industry. Printing, separation and binding Printing It is a very lightweight bond, usually without slit perforations to remove the engagement hole strips. The cheapest grade of continuous form paper is often preprinted with bars of light green lines across its width, to facilitate following a line of information across the page, a type commonly referred to as green bar, music or music-ruled paper. Perforations are very small and close together, referred to as microperforations or microperf, to allow the sheets to be separated and the sprocket hole strip ("perfory," see "Shape and Form" section) torn off leaving a very smooth edge almost as if guillotine-cut. The highest grade of continuous form paper uses a heavy bond weight similar to typing paper. Preprinted green bar continuous form paper When the perforated edges of the paper are manufactured so that they tear off the pages in strips, those strips are known as "perfory." Common types Tear-off horizontal perforations at page top/bottom are exactly in-between standard perforations, at whatever regular interval is used for that particular paper. Standard perforations are 5/32 inch in diameter (3.96875mm, sometimes called 4mm) and are spaced at 1/2 inch center-to-center.
Many laser printers can print on both sides of the paper (duplex printing), which is not possible with continuous stationery. If an impact printer is used multiple simultaneous copies can be printed on multipart forms. Continuous stationery printed on a suitable printer is typically cheaper than laser printing although the output is of lower quality. Where better appearance is necessary the perforations can be much finer, leaving an almost perfectly smooth edge (microperforations, microperf for short).Ĭontinuous form paper of all types remains in production, although largely supplanted with the introduction of fast laser printers with single-sheet feed. The tear perforations may be short slits, which leave noticeable serrations when torn apart, acceptable for many business documents such as invoices or basic data (such as computer code). Alternatively some types of continuous form paper also have longitudinal perforations along each edge inside the engagement holes, allowing the strips with sprocket holes to be torn off the printed page. After printing the separated sheets can be held in binders by using the sprocket holes when simply required as a record.
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