The spirally-wound tube, which forms the body of a paper can, may also be used for mailing tubes, cores for toilet paper and cores for ribbon and thread.
WATER-TIGHT PAPER CANS
To make an all-paper can water-tight, submerge it in molten paraffine, or pour hot paraffine in and out of the can. Paper, paraffined on one side, may be run on the inside or on the outside of the can, or both, to produce a moisture-proof container which will hold semi-liquids for an indefinite time.
Some paper cans have slip-on covers and bottoms, others have the top and bottom crimped on; others still have a neck for the lid. Expensive types of paper cans have spun-on ends, and many are made with screw-on tin tops.
When printed or lithographed wrappers are carefully applied to the paper cans, they cannot be told from regular tin cans. Many wrappers for paper cans are done in beautiful colors.
HOW CORRUGATED PAPER BOXES ARE MADE
There are three different kinds of corrugated paper in general use, and many of the larger manufacturers of corrugated paper boxes have their own machines for making the three kinds of corrugated board referred to.
Unlined corrugated paper is usually made of strawboard and is used for lining, covering and padding. This paper is exceedingly useful in packing glass, bottles, and other breakable goods, being used as lining and padding in the shipping cases.
Single-face corrugated paper is made by gluing a liner, or sheet of strong texture paper to one side of the corrugations. The corrugated stock is made of strawboard, newsboard or chipboard, and the liner may be of heavy manila, news or chip stock, or of other kinds of coarse paper which are strong in texture. The standard length of rolls is 250 feet, and the standard width is 36 inches, although this paper is made as wide as 48 inches. Single-face corrugated paper is used for making tubes for holding glass articles, partitions for shipping containers, lining for barrels and wood boxes, etc.
