What are the causes of poor adhesion or delamination between plastic and metal during the forming process of plastic-steel profiles, and how can these issues be resolved?

The reasons for poor adhesion or delamination between plastic and metal in formed composite profiles include:
① Inappropriate compression zone and bonding length in the co-extrusion die; insufficient melt pressure within the die or excessively short bonding length may result in weak adhesion between plastic and metal;
② Unsuitable adhesive selection—typically, thermosetting adhesives offer significantly higher bonding strength than thermoplastic adhesives;
③ Insufficient or excessive preheating temperature of the metal liner, which may cause charring at the bonding interface and reduce the adhesion strength between plastic and metal;
④ Residual oil films on the metal surface act as a barrier, reducing the bond strength between plastic and metal.
Main solutions include:
① Appropriately increasing die pressure to extend the bonding length between plastic and metal;
② Selecting an appropriate adhesive;
③ Properly controlling the preheating temperature of the metal liner;
④ Cleaning the surface of the metal liner material. may experience slight vibration, leading to unstable production. Conversely, if the bonding length is too short, the bonding strength between the plastic and metal will decrease.
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