CORRUGATED cardboard shipping boxes (aka) Cardboard Boxes.

 

The Regular Slotted Carton (RSC) is the most common and economical box style to available. All flaps of an RSC are the same length and meet at the center of the box. The edge join is glued with super duty and flexible material. These shipping boxes are:

 

 

Super 8 Packing Peanuts

 

Corrugated board 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 (reclycled 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.

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