EP 0152960 B1 19890628 - ROTATABLE FILM WRAPPING APPARATUS AND PROCESS FOR UNITIZING A LOAD WITH A COMPRESSIVE OVERWRAP
Title (en)
ROTATABLE FILM WRAPPING APPARATUS AND PROCESS FOR UNITIZING A LOAD WITH A COMPRESSIVE OVERWRAP
Publication
Application
Priority
US 58279784 A 19840223
Abstract (en)
[origin: EP0152960A2] 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 prestretch mechanism (70). Tension reductions in the web (58) caused by holes at web imperfections do not slow or stop the prestretch mechanism (70).
IPC 1-7
IPC 8 full level
B65B 11/00 (2006.01)
CPC (source: EP)
B65B 11/008 (2013.01)
Citation (examination)
US 4317322 A 19820302 - LANCASTER PATRICK R, et al
Designated contracting state (EPC)
DE FR GB NL SE
DOCDB simple family (publication)
EP 0152960 A2 19850828; EP 0152960 A3 19861022; EP 0152960 B1 19890628; CA 1241588 A 19880906; DE 3571229 D1 19890803; GB 2154536 A 19850911; GB 8504584 D0 19850327
DOCDB simple family (application)
EP 85101960 A 19850222; CA 474977 A 19850222; DE 3571229 T 19850222; GB 8504584 A 19850222