the material coolers 11 may then be used to cool the laminate strip 5 prior to cutting into laminate sheets 6 in another embodiment stiff sheet core lamina 1 b such as polycarbonate shown in fig2 may be similarly laminated between the outer textured lamina as described above but with a variation comprising using heaters 10 to enable partial piercing leaving a small contact gap of say 5 of structure height between each lamina after passing through first rollers 4 c 4 d coolers 11 then return the lamina 1 a to a harder state after which second rollers 4 4 a complete the piercing and bring full contact in this way the piercing structures are forced a short distance into the too stiff or too thick core lamina whereupon a region of considerable compressive tension is created about each piercing structure and resulting in an unexpected retention force since these structures naturally have a tapered cross section a secondary taper fit retention well known in the mechanical field is achieved adding further retentive strength this all results in an exceptionally rigid low cost laminate suitable for a wide range of uses the sheets may be cut into shorter laminate pieces 6 a in fig3 is shown the textured face 3 a and.