Patent ID: 7077183

Claim:
A laminating machine for the production of laminated polyethylene sheets, said machine comprising a support platform formed by a driven belt conveyor having a flat conveying surface, said bell conveyor defining an input end and an output end, at least two laminating assemblies spaced apart over and along said conveying surface; said laminating assemblies each having a hot air diffuser housing provided with an elongated slot opening disposed transversely to and spaced above said conveying surface, said slot opening having a predetermined width throughout its length, and a press roll spaced behind said slot opening; a sheet laminating slot formed between said hot air diffuser housing slot opening and said press roll, diffuser adjustment means to adjust the spacing between said slot opening of said diffuser housing and said conveying surface, press roll adjustment means to adjust the spacing between said press roll and said conveying surface, hot air feed means to supply hot air under pressure to said diffuser housing, and heating means to provide a source of hot air to said hot air feed means, guide means disposed above said elongated slot opening supportingly guiding a top polyethylene sheet into said laminating slot above a lower polyethylene sheet whereby to expose an underface of said top polyethylene sheet to said slot opening of said hot air diffuser to simultaneously melt said underface of said top polyethylene sheet and a top face of said lower polyethylene sheet for heat fusing said polyethylene sheet surfaces together, said top and lower polyethylene sheets being guided under said press roll immediately downstream of said sheet laminating slot to apply a predetermined pressure between said upper and lower polyethylene sheets as they are melting to set the thickness of said laminated sheets at said laminating assembly.