Postal tubes are a type of mailing or shipping tube used to safely transport items that are able to be rolled into a cylindrical shape through the mail, or packaged into other items for transportation purposes. They help ship products like posters, blueprints, signs, banners and important documents that cannot be folded and must remain uncreased. Valuable items such as artwork or paintings can also be shipped using postal tubes.
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Constructed from heavy-duty cardboard and adhesives for added strength, mailing tubes provide adequate protection against denting, dropping, crushing and bending, all of which may occur because of rough handling during transit. Mailing tubes, or shipping tubes, are inexpensive and easily purchased at any post office, shipping store or office supply store. They may also be bought in bulk from online cardboard tube manufacturers by businesses that ship large amounts of valuable paper products. Postal tubes are available in many different sizes to accommodate the large range of items with different lengths and widths, although most are not longer than 48 inches to comply with shipping standards, and to ensure structural strength. Tubes are defined by interior measurements and this is important to consider when purchasing size specific tubing. Some mailing tubes are telescoping, meaning they are adjustable and may retract or expand lengthwise.
All tubes made of cardboard, no matter what their purpose, may be used multiple times as long as the cross-section is not damaged. When they are too worn, postal tubes are easily recycled along with other cardboard products. Since international shipping has a higher chance of damaging products, some postal tubes made of fiberboard are specifically made for heavy-duty applications and long distance shipping. Cardboard tubes designed for shipping are made from wood pulp fibers and are cylindrical in shape. The cardboard material is composed of several layers that are cut into ribbons, coated with adhesive or fibers for reinforcement and wrapped around a mandrel in the desired shape of the tube at a continuous angle. The long paper tube is then cut to size. Postal tubes protect fragile paper products better than cardboard boxes not only because of their round shape, but they also have dense, thick walls that provide more strength. It's important to choose the appropriately sized tube. Optimally, the tube should be slightly longer than the rolled item. The ends are plugged by caps that are snapped on or glued and made of plastic, metal or wood. The ends might also be crimped and glued together. Some postal tube exteriors are covered in kraft paper to provide a shiny finish, colors, text designs or images.