Wrapping of agricultural bales of rectangular cross section

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 65/38 (2006.01) A01F 15/07 (2006.01) B65B 11/04 (2006.01)

Patent

CA 2636593

A method of applying stretch film wrapping to an agricultural bale (10) which is of rectangular cross section and using a bale wrapper apparatus which comprises: a table which supports the bale (10) and which operates to rotate the bale generally about its longitudinal axis (11) during a wrapping cycle; a dispenser reel arrangement (12, 13, 16, 17, 20, 21, 24, 25) from which stretch film wrapping is withdrawn so as to form successive overlapping windings of film which cover the bale; and means which applies relative rotation between the table and the dispenser reel arrangement about a second axis (14) which extends substantially perpendicular to said first axis during the wrapping cycle; in which: each winding of film includes a longitudinal edge strip portion and an adjoining longitudinal strip portion; and the longitudinal edge portion has different deformation properties from the deformation properties of said adjoining portion so as to be more readily extensible under a given load than said adjoining portion, and thereby to enable the winding to tighten itself around each corner (15) of the bale (10) and thereby at least minimise the generation of creases or wrinkles in the film winding at each corner region of the bale.

L'invention concerne un procédé d'application d'un emballage en film étirable à une balle agricole (10) présentant une section droite rectangulaire, à l'aide d'un appareil d'emballage de balles comportant : une table supportant la balle (10) et fonctionnant pour faire tourner la balle généralement autour de son axe (11) longitudinal pendant un cycle d'emballage ; un dispositif (12, 13, 16, 17, 20, 21, 24, 25) de bobine débitrice à partir duquel un emballage en film étirable est dévidé de façon à former des enroulements successifs chevauchants de film recouvrant la balle ; et un moyen d'application d'une rotation relative entre la table et le dispositif de bobine débitrice autour d'un deuxième axe (14) qui s'étend sensiblement perpendiculairement audit premier axe pendant le cycle d'emballage ; caractérisé en ce que : chaque enroulement de film comprend une partie de bande de bord longitudinal et une partie adjacente de bande longitudinale ; et en ce que la partie de bord longitudinal présente des propriétés de déformation différentes de celles de ladite partie adjacente de façon à être plus aisément extensible sous une charge donnée que ladite partie adjacente, à permettre ainsi à l'enroulement de se resserrer autour de chaque coin (15) de la balle (10) et à minimiser ainsi au moins la génération de plis et de rides dans l'enroulement de film au niveau de chaque région de coin de la balle.

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