Air Sea Containers Ltd offers an extensive range of 4G boxes tested and approved as UN combination packagings with a variety of different Inner packagings in glass, plastic, tinplate, and aluminium.
If you are unable to find the product you are looking for, please contact us and a member of our sales team will be able to advise you.
Air Sea Containers offers a range of 4GV Boxes or Superpacks. 4GV boxes are special outer packagings that allow the transport of non- specified inner packagings up to a stated maximum weight.
If you are unable to find the product you are looking for, please contact us and a member of our sales team will be able to advise you.
Corrugated fiberboard boxes are a paper-based material consisting of a fluted corrugated sheet and one or two flat linerboards. It is widely used in the manufacture of corrugated boxes and shipping containers.
The corrugated medium and linerboard are made of paperboard, a paper-like material usually over ten mils (0.010 inch, or 0.25 mm) thick. Paperboard and corrugated fiberboard are sometimes called cardboard, although cardboard might be any
heavy paper-pulp based board.
History of Fiberboard Boxes
In the mid-19th century, an ingenious concept enabled flimsy sheets of paper to be transformed into a rigid, stackable and cushioning form of packaging for delicate goods in transit.
Corrugated (also called pleated) paper was patented in England in 1856, and used as a liner for tall hats, but corrugated boxboard was not patented and used as a shipping material until December 20, 1871. The patent was issued to Albert
Jones of New York City for single-sided (single-face) corrugated board. Jones used the corrugated board for wrapping bottles and glass lantern chimneys. The first machine for producing large quantities of corrugated board was built in 1874
by G. Smyth, and in the same year Oliver Long improved upon Jones' design by inventing corrugated board with liner sheets on both sides. This was corrugated board as we know it today.
The Scottish-born Robert Gair invented the pre-cut paperboard box in 1890 – flat pieces manufactured in bulk that folded into boxes. Gair's invention came about as a result of an accident: he was a Brooklyn printer and paper-bag maker
during the 1870s, and one day, while he was printing an order of seed bags, a metal ruler normally used to crease bags shifted in position and cut them. Gair discovered that by cutting and creasing in one operation he could make
prefabricated paperboard boxes. Applying this idea to corrugated boxboard was a straightforward development when the material became available in the early twentieth century.
The fiberboard boxes were initially used for packaging glass and pottery containers, which are easily broken in transit. Later, the case enabled fruit and produce to be brought from the farm to the retailer without bruising, improving the
return to the producers and opening up export markets.
Manufacture of Fiberboard Boxes
Fiberboard boxes is manufactured on large high-precision machinery lines called corrugators, usually running at 500 lineal feet per minute or faster. These machines over time have become very complex with the objective of avoiding some
common problems in corrugated board production, such as warp and washboarding.
In the classical corrugator, the paper is humidified with high-pressure steam to soften the paper fibres so that the formation of the flute and the consequent gluing will go smoothly. Humidification adds a considerable amount of water to
the papers, and after the formation of the board, the humidity has to be removed by drying in the so-called dry-end. Here the newly formed corrugated board is heated from the bottom by hot plates. On the top, various pressures are applied
by a load system on the belt.
The corrugated medium is often 26 lb/1000 sq.ft basis weight in the USA; in the UK a 90 gram per square metre fluting paper is common. At the single-facer, it is heated, moistened, and formed into a fluted pattern on geared wheels. This is
joined to a flat linerboard with a starch based adhesive to form single face board. At the double-backer, a second flat linerboard is adhered to the other side of the fluted medium to form single wall corrugated board. Linerboards are test
liners (recycled paper) or kraft paperboard (of various grades). The liner may be bleached white, mottled white, colored, or preprinted.
Common flute sizes are "A", "B", "C", "E" and "F" or microflute. The letter designation relates to the order that the flutes were invented, not the relative sizes. Flute size refers to the number of flutes per lineal foot, although the
actual flute dimensions for different corrugator manufacuturers may vary slightly. Measuring the number of flutes per lineal foot is a more reliable method of identifying flute size than measuring board thickness, which can vary due to
manufacturing conditions. The most common flute size in corrugated boxes is "C" flute.
Corrugated fiberboard boxes can be specified by the construction (single face, singlewall, doublewall, etc), flute size, burst strength, edge crush strength, flat crush, basis weights of components (pounds per thousand square feet, grams
per square meter, etc), surface treatments and coatings, etc. TAPPI and ASTM test methods for these are standardized.
The choice of corrugated medium, flute size, combining adhesive, and linerboards can be varied to engineer a corrugated fibreboard with specific properties to match a wide variety of potential uses. Double and triple-wall corrugated fibre
board is also produced for high stacking strength and puncture resistance.
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