The clamshell portion comprises a substrate material including at least one layer of paperboard and at least one layer of polylactic acid adhered to the paperboard layer.

The layer of foamed polymer (34) replaces the paperboard layer of known laminate structures.

The invention relates to a corrugated cardboard which contains at least one smooth layer (1) and at least one corrugated layer (2), at least one of the layers being a cardboard layer (1).

A first paperboard layer is then laminated to the coated side of the barrier layer.

A container with an improved closure system and other improved features made of a single-faced paperboard blank formed of a corrugated paperboard layer and a substantially flat paperboard layer.

The beams may consist of a double layer of multiply corrugated cardboard.

For example, the card may be in the form of a laminate comprising a layer of board and a layer of paper formed with the security feature, e.g. a metallic strip or a fluorescing logo.

The laminate structure may further include a second paperboard layer laminated to the uncoated side of the barrier layer.

The bonding of the layer of cardboard (3) of the first panel (A) to the layer of cardboard (4) of the second panel (B) forces the two panels to a permanent, stable equilibrium of the respective opposite curving tensions.

When the board layer is heated, the polymer melts and water vapour bubbles penetrate it, rendering the layer porous.

It is also possible to use a layer of recycled cardboard between two layers of virgin cardboard.

The packaging material (54) may be a carton blank, a PET bottle, or a laminated packaging material having at least one fiberboard layer.

The sentiment is stamped directly onto the white card stock.

Put down a layer of corrugated cardboard or other protective material.

Depth of cuts approximately 2.3 mm to the other side of the cardboard layer;