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272 FOOD PACKAGING TECHNOLOGY Consumer unit package Figure 8.21 Transit package can be a corrugated fibreboard case containing a fixed number of unit packages (courtesy of Iggesund Paperboard). materials, type of fluting, dimensions and weight of contents which can predict the compression strength of cases. Hence it is possible to estimate the weight of material and type of fluting which should provide adequate compression strength after an appropriate safety factor has been taken into consideration. The most common design of case used in the food industry is the RSC, regular slotted container. In this design all the perimeter cutting, cutting of slots, which enable the flaps to fold neatly despite the thickness of the material, and the scoring or indenting to provide creasing and folding are carried out in straight lines in both MD and CD. Diecutting is necessary for special designs incorporating cutouts, curves and angles. Designs with these features are sometimes used in the food industry in conjunction with stretch or shrink wrapping to create more visual impact in cash-and-carry sales outlets. Other designs of transit pack using corrugated fibreboard are typically the wrap around case erected on the packing line and the tray type packs of which there are many versions (Fig. 8.21). Some are subsequently stretch or shrink wrapped and some are erected around the primary packs to provide stacking strength and partial visability of the primary packs without any overwrapping plastic film. 8.8.11 Moulded pulp containers The most common food packaging applications for moulded pulp containers are the egg packs and the trays used for apples and other fresh produce.