PURPOSE:To provide the title system capable of preventing the products from flute formation, so designed that difference in level is eliminated and square- shaped blocks are made to slide, and even during enclosing process, an smooth surface is provided, thereby, when a packaging cover is to cut, the outer skin will not be picked up due to the above-mentioned difference in level. CONSTITUTION:A square-shaped block 1 has a recessed sliding surface 3 made up of upper surface 31, medium surface 32 and lower surface 33 and a projected sliding surface 2, and the former surface 3 is latched to the projected sliding surface 2' of the adjacent square-shaped block 1'. And, the latter surface 2 is latched to the recessed sliding surface 3'' of the oppositely adjacent square- shaped block 1''. The enclosure which is opened or closed by the sliding of the block 1 is closed by assembly of the tangential line 221 with the medium surfaces 32, 22 and also closed by the tangential lines 221 and 231 following above and below said tangential line 221, respectively; thus, when a packaging cover is to be cut, the outer skin will not be picked up due to the above- mentioned difference in level, therefore, flutes will not be formed on the products.
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