Apparatus and method for producing coated film
US4212908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Nov 6, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/11
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to apparatus and a method for producing a coated film in which a cooled polymeric tubular extrudate is coated, reheated and inflated to yield an oriented, coated tubular film. The apparatus includes a coating head comprising a rotatable assembly including a support member [13] providing an orifice [14] through which the tubular extrudate may be fed, a plurality of spreading members [19] spaced-apart around the orifice, mounting means [15] for each of the spreading members operatively associated with the support member and displaceable relative thereto, and means [21] for biasing each of the spreading members into engagement with the tubular extrudate. Liquid coating medium is suitably deposited on the extrudate from a spray assembly, and the coating asembly is rotated around the extrudate thereby spreading and polishing the deposited medium to yield a uniformly coated film. The system is particularly suitable for the production of polymeric packaging films having an antistatic coating on the surface thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.