(19)
(11) EP 0 152 960 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.10.1986 Bulletin 1986/43

(43) Date of publication A2:
28.08.1985 Bulletin 1985/35

(21) Application number: 85101960

(22) Date of filing: 22.02.1985
(84) Designated Contracting States:
DE FR GB NL SE

(30) Priority: 23.02.1984 US 582797

(71) Applicants:
  • Lancaster, Patrick R.
     ()
  • Lancaster, William G.
     ()

(72) Inventor:
  • Lancaster, Patrick R.
     ()

   


(54) Rotatable film wrapping apparatus and process for unitizing a load with a compressive overwrap


(57) @ A rotatable film wrapping apparatus (30) for wrapping a load (24) having a film web pre-stretch mechanism (70) which dispenses film at a varying speed controlled independently of variations in film tension and speed between the pre-stretch mechanism (70) and the load (24), and a supply speed control mechanism (90) which varies the supply speed of web from the pre-stretch mechanism (70). The supply speed control mechanism (90) is configured as a predetermined model of the load (24) to minimize variation in film elongation and containment as successive load edges intercept film web during wrapping. A power pully or roller engages the supply speed control mechanism (90) to accelerate and decelerate the pre-stretch mechanism to overcome rotational inertia of the film roll (56) and pre-stretch mechanism (70). Tension reductions in the web (58) caused by holes at web imperfections do not slow or stop the pre-stretch mechanism (70).






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