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Interior Form Boxes Liners, shells or tubes, pads, build-ups, dividers, partitions
and other inner packing pieces can be made in an infinite variety of ways to
separate or cushion products, to strengthen the box, or to prevent product
movement by filling voids. They may be simple rectangles, or scored, slotted,
scored and slotted, or die-cut shapes.
Many of the types in common use have been given International Box
Code numbers. The railroad Classification provides specifications for
some pieces used in the packing of glassware and other fragile articles.
Pads are plain rectangles of corrugated
or solid fibreboard. They can be used to fill the space between the inner flaps
of RSC, to completely cover the bottom or top of a box, or to separate layers of
product. Vertically, they can be used to separate products or add stacking
strength.
Tubes or shells are scored rectangles,
folded and sometimes joined with tape to forum a multi-sided structure open at
both ends. When used as sleeves for individual items such as glassware,
adjacent shells provide double protection.
Triangular shells are frequently used for stacking strength in
the corners of boxes. Rectangular shells that are the same size and depth as the
box (minus the thickness of the box) are called liners.
Partitions or dividers provide a
separate cell for each item in a box. They are used primarily for glass-ware and
other fragile articles.
Scored and folded inner packing pieces
can take many shapes. Included in this group are built-up pads consisting of
multiple pieces glued together.
Inner packing pieces are used for cushioning, suspension and
separation, and to fill voids. The suspension function holds the product away
from the walls of the box to lessen the impact of drops or bumps. Complete
filling of voids created by irregularly shaped products adds stacking strength
to the box.
Inner packing forms are usually die
cut to position and support irregular products from below, or lock them into
position from above. Alternatively, forms can be placed on two sides or ends of a
product. Some inner packing forms are extensions of the box flaps.
In many cases, the box itself is rather common, but ingenious
inner packing makes an irregular product easy to pack and safe to ship.
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