| 摘要 |
The inner and outer layers of the packing by the outer layer having recesses or sunken formations (21) near to its mouth edge, whilst the inner layer (11) has projections (23) which insert into the recesses or sunken formations, producing a locking effect. The recesses or sunken formations (21) are formed in or near the packing corner areas. - To produce the packing, the outer layer is formed as a tray, and the inner layer is applied to it by heating and deformation, with its shape produced pref. by form-blowing of the plastic foil material heated to the appropriate temp. During the heating process of the inner layer, the projections are formed. |
