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Corrugated fiberboard

Image by Joost J. Bakker IJmuiden
Corrugated fiberboard

Corrugated fiberboard is a paper-based materials consisting of a fluted corrugated sheet and one particular or two flat linerboards. It is broadly employed in the manufacture of corrugated boxes and shipping containers.

The corrugated medium and linerboard are made of containerboard, a paper-like materials generally more than .01 inches (.25 mm) thick. Paperboard and corrugated fiberboard are at times called cardboard, although cardboard may well be any heavy paper-pulp based board.

Background

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 referred to as pleated) paper was patented in England in 1856, and utilized as a liner for tall hats, but corrugated boxboard was not patented and employed 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 utilized the corrugated board for wrapping bottles and glass lantern chimneys. The first machine for creating huge quantities of corrugated board was constructed in 1874 by G. Smyth, and in the very same year Oliver Extended improved upon Jones’ style by inventing corrugated board with liner sheets on each sides. This was corrugated board as we know it these days.

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 in the course of the 1870s, and 1 day, while he was printing an order of seed bags, a metal ruler normally employed to crease bags shifted in position and cut them. Gair discovered that by cutting and creasing in one particular operation he could make prefabricated paperboard boxes. Applying this thought to corrugated boxboard was a straightforward advancement when the materials became obtainable in the early twentieth century.

The corrugated box was initially utilized for packaging glass and pottery containers. Later, the situation enabled fruit and generate to be brought from the farm to the retailer with out bruising, improving the return to the producers and opening up export markets.

Manufacture of corrugated board

Corrugated board is manufactured on significant high-precision machinery lines named corrugators, usually running at about 500 feet per minute (2.5 m/s) or far more. These machines over time have turn out to be extremely complicated with the objective of avoiding some typical problems in corrugated board production, such as warp and washboarding.

The manufacturing approach starts with pulping, the separation of wood (hardwood and sapwood) into person fibers, as accomplished by mechanical techniques or chemical remedy.

In the classical corrugator, the paper is softened with high-pressure steam. After the board is formed it is dried in the so-named dry-end. Right here the newly formed corrugated board is heated from the bottom by hot plates. On the leading, numerous pressures are applied by a load method on the belt.

The corrugated medium is frequently .026 pounds per square foot (.13 kg/m²) basis weight in the U.S. in the UK, a 90 grams per square metre (.018 lb/sq ft) fluting paper is frequent. 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 numerous grades). The liner may be bleached white, mottled white, colored, or preprinted.

Typical flute sizes are &quotA&quot, &quotB&quot, &quotC&quot, &quotE&quot and &quotF&quot or microflute. The letter designation relates to the order that the flutes had been invented, not the relative sizes. Flute size refers to the quantity of flutes per lineal foot, though the actual flute dimensions for diverse corrugator manufacuturers may vary slightly. Measuring the quantity of flutes per lineal foot is a far more dependable technique of identifying flute size than measuring board thickness, which can vary due to manufacturing circumstances. The most typical flute size in corrugated boxes is &quotC&quot flute.

Corrugated fiberboard can be specified by the construction (single face, singlewall, doublewall, and so on), flute size, burst strength, edge crush strength, flat crush, basis weights of components (pounds per thousand square feet, grams per square meter, and so forth), surface treatment options and coatings, and so on. TAPPI and ASTM test approaches for these are standardized.

The choice of corrugated medium, flute size, combining adhesive, and linerboards can be varied to engineer a corrugated board with particular properties to match a wide variety of prospective makes use of. Double and triple-wall corrugated board is also produced for high stacking strength and puncture resistance.

Manufacturing

Boxes can be formed in the exact same plant as the corrugator. Part of the scoring and cutting takes location in-line on the corrugator. Alternatively, sheets of corrugated board might be sent to a different manufacturing facility for box fabrication these are often referred to as &quotsheet plants&quot.

The corrugated board is creased or scored to offer controlled bending of the board. Most typically, slots are cut to present flaps on the box. Scoring and slotting can also be accomplished by die-cutting.

The &quotFlexo Folder Gluer&quot is a machine that in 1 single pass prints, cuts, folds, and glues flat sheets of board to convert them to boxes for any application, from storing old family members pictures to shipping the greatest of plasma Tv sets to the international market place. The most advanced of FFG’s can run at speeds of up to 26,000 boxes per hour (about 433 per minute).

Single-face laminate

A limitation of typical corrugated materials has been the difficulty in applying fine graphic print for informative and advertising purposes. The causes for this stem from the truth that prefabricated corrugated sheets are comparatively thick and spongy, compared to the thin and incompressible nature of solid fibre paper such as paperboard. Due to these characteristics of corrugated, it has been mainly printed utilizing a flexographic procedure, which is by nature a coarse application with loose registration properties.

A a lot more current improvement well-liked in usage is a hybrid product featuring the structural advantages of corrugated combined with the high-graphics print of lithography previously relegated to paperboard folding cartons. This application, generally referred to as ‘Single-Face Laminate’, begins its procedure as a conventional fluted medium adhered to a single linerboard (single-face), but in spot of a second long-fibered liner, a pre-printed sheet of paperboard such as SBS (solid bleached sulfate) is laminated to the outer facing. The sheet can then be converted with the very same processes employed for other corrugated manufacturing into any desired kind.

Specialized equipment is essential for the material construction of SFL, so users might expect to pay a premium for these goods. Nevertheless, this price is typically offset by the savings over a separate paperboard sleeve and the labor necessary to assemble the completed package.

Recycling

Old corrugated containers are an exceptional source of fibre for recycling. They can be compressed and baled for expense successful transport. The baled boxes are put in a hydropulper, which is a big vat of warm water for cleaning and processing. The pulp slurry is then used to make new paper and fiber goods.

Mill and corrugator scrap, or broke, is the cleanest source for recycling. The high rates of post-customer recycling reflect the efficiency of recycling mills to clean and process the incoming supplies. Several technologies are accessible to sort, screen, filter, and chemically treat the recycled paper.

Many extraneous supplies are readily removed. Twine, strapping, and so on are removed from the hydropulper by a &quotragger&quot. Metal straps and staples can be screened out or removed by a magnet. Film-backed pressure sensitive tape stays intact: the PSA adhesive and the backing are each removed with each other.

Supplies which are more hard to get rid of consist of wax coatings on corrugated boxes and &quotstickies&quot, soft rubbery particles which can clog the paper maker and contaminate the recycled paper. Stickies can originate from book bindings, hot melt adhesives, PSA adhesives from paper labels, laminating adhesives of reinforced gummed tapes, etc.

Corrugated fiberboard shredders are now offered which convert post-consumer corrugated board into packing/cushioning supplies by implies of a specialized shredding process.

Recycling corrugated fiberboard aids countries without sustainable wood resources develop a paper and packaging sector locally.

ASTM Standards

D1974 Standard Practice for Methods of Closing, Sealing, sucking, blowing and Reinforcing Fiberboard Boxes
D4727 Regular Specification for Corrugated and Solid Fiberboard Sheet Stock (Container Grade) and Cut Shapes
D5118 Regular Practice for Fabrication of Fiberboard Shipping Boxes
D5168 Regular Practice for Fabrication and Closure of Triple-Wall Corrugated Fiberboard Containers
D5639 Common Practice for Selection of Corrugated Fiberboard Materials and Box Construction Based on Performance Needs
D6804 Normal Guide for Hand Hole Design in Corrugated Boxes
- and others

Additional reading

&quotFibre Box Handbook&quot, Fibre Box Association
Koning, J., &quotCorrugated Crossroads, A Reference Guide for the Corrugated Business&quot, TAPPI Press, 1995, ISBN -89852-299-4
European Corrugated Board Business
Great Manufacturing Practices for Corrugated and Solid Board Packaging This GMP-common makes it possible for packaging for the food sector to be made to the highest standards of customer safety. All details at the internet site of the European Federation of Corrugated Board Producers (FEFCO)
Brody, A. L., and Marsh, K, S., &quotEncyclopedia of Packaging Technology&quot, John Wiley &amp Sons, 1997, ISBN -471-06397-5
Soroka, W, &quotFundamentals of Packaging Technologies&quot, IoPP, 2002, ISBN 1-930268-25-4
&quotGuide for Packaging for Small Parcel Shipments&quot, 2005, IoPP
Asian Corrugated Carton Association

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Schlafen wie auf Wolke Sieben/ Like sleeping on cloud nine

Image by BASF – The Chemical Company
The new variant of BASF’s melamine resin foam Basotect® is known as Basotect®UF and it is substantially more versatile than the conventional material. As a result, this thermoset foam is now suitable for cushioning mattresses and upholstering sofas. Basotect is a flexible, open-cell foam made from melamine resin, a thermoset plastic. Its characteristic characteristic is its intricate three-dimensional network structure consisting of slender and therefore effortlessly shapable filaments. Basotect is flame-resistant, can be employed at up to 240°C, is abrasive and has consistent physical properties over a wide temperature range. In addition, Basotect is quite lightweight, is in a position to insulate heat, has a high acoustical absorption capability and remains flexible even at reduced temperatures. These properties imply that Basotect can be employed in many different applications: for bettering room acoustics, for the thermal insulation of solar installations, in upholstered furniture and mattresses, as properly as in automobile manufacture and aircraft construction.

Die neue Variante des Melaminharz-Schaumstoffs Basotect® heißt Basotect® UF und ist deutlich flexibler als das herkömmliche Materials. Damit eignet sich der duroplastische Schaumstoff der BASF erstmals für die Polsterung von Matratzen und Sofas. Basotect ist ein flexibler, offenzelliger Schaumstoff aus Melaminharz, einem duroplastischen Kunststoff. Dessen typisches Kennzeichen ist die filigrane räumliche Netzstruktur, die aus schlanken und damit leicht verformbaren Stegen gebildet wird. Basotect ist schwer entflammbar, anwendbar bis 240°C, ist abrasiv und hat in einem weiten Temperaturbereich gleichbleibende physikalische Eigenschaften. Basotect ist darüber hinaus sehr leicht, kann Wärme gut dämmen, hat ein hohes Schallabsorptionsvermögen und bleibt auch bei tiefen Temperaturen flexibel. Aufgrund dieser Eigenschaften läßt sich Basotect in vielen Bereichen anwenden: zur Verbesserung der Raumakustik, zur Wärmedämmung von Solaranlagen, im Bereich Polstermöbel und Matrazen, sowie im Automobil- und Flugzeugbau.

www.basotect.de
www.basotect.com

Copyright: BASF

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Got them all!

Image by Annie in Beziers
Ultimately, my 3 cats in a single shot! All passed out in the heat. See that Max has nicked Alicia’s cushion and she is relegated to the floor! LOL