| 摘要 |
<p>A method of injection moulding a plastics material opening device (26; 126; 226) in a hole provided in a packaging sheet material (8) including mutually arranging a first mould tool (2; 102; 202) and a second mould tool (4; 104; 204) so as to form a mould cavity in which the hole edge (12) is arranged and so as to bias a sheet portion (8a) of the packaging sheet material arranged adjacent the hole edge away from the second mould tool, and injecting heated thermoplastics material into the mould cavity so as to form the plastics material opening device. The biasing of the sheet portion away from the second mould tool aids in the formation of plastics material on the side of the sheet portion disposed towards the second mould tool, for providing a controlled placement of the opening device at the sheet hole.</p> |
