| 摘要 |
<p>1,165,793. Making boxes; moulding cartons; moulds. P. HINTEREGGER, [trading as P. HINTEREGGER K.G.]. 21 March, 1967 [25 March, 1966], No. 13210/67. Headings B5A and B5D. [Also in Divisions B6 and B8] A tear line 40 for separating into a number of parts, a packaging or box of thermoplastic foil comprises a region along whose length the molecules are orientated in the direction of separation. It is formed by clamping the heated foil at both sides of the tear line region so that drawing of the foil for making the remainder of the packaging does not interfere with orientating of the foil molecules along the tear line. As described, the packaging, for e.g. eggs or fruit, comprises similar halves 1, 2 integrally joined by a web 3 and having depressions 20 which facilitate nesting and have ribs 25 to support resiliently the contents. Press studs A, B, see, also Figs. 6, 7 (not shown), secure the packaging closure. The packaging is vacuum or compressed air-formed in reciprocable male and female dies C, D. The tear line 40 is formed in the foil 62 by a row of needles 64 and clamped at each side during formation by a resiliently loaded rail 66. To prevent the walls of the web formed between the points 41 from welding together, the needles are arranged alternately short (64<SP>11</SP>) and long (64<SP>1</SP>), Fig. 5 (not shown).</p> |
