Package making – Methods – Conforming by stretching or shrinking of cover over contents
Patent
1995-11-16
1998-02-10
Johnson, Linda
Package making
Methods
Conforming by stretching or shrinking of cover over contents
53211, 53587, 53556, 533893, B65B 4100, B65B 5300
Patent
active
057156557
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method for packaging bodies, primarily moist or wet bales of cattle-feed, wherein a thin plastic web is wrapped around the body in successive turns while maintaining the web in tension, wherein the plastic web is taken from a magazine while simultaneously rotating the body around a preferably essentially horizontal longitudinal axis of the body, wherein said turns extend in a plane which includes essentially the aforesaid longitudinal axis, and wherein the wrapping process is terminated by gripping the plastic web at a web region between the magazine and the bale, such as to break the web.
The invention also relates to an arrangement for carrying out the method.
Methods of this general kind are known to the art. When wrapping bales of moist or wet horse-feed for storage in a bale silo, a bale is placed on a table with the longitudinal axis of the bale extending generally horizontally, and the bale is rotated about its longitudinal axis and the plastic web is wrapped around the bale in successive turns which essentially include the longitudinal axis of the bale, with the aid of rotators provided herefor, such as endless belts, and by rotating the table or swinging the film magazine at the same time. When wrapping of the bale is completed, the plastic web is gripped by means of a gripping device mounted on the table and the web is torn-off or severed in some other way.
One serious problem is that a considerable length of plastic web is left dangling freely from the bale, which has serious drawbacks. These dangling lengths of plastic web cause substantial disturbances in the surroundings when flapping in the wind, and tend to fasten in the branches of trees etc., and remain hanging from the bales for a long period of time. Furthermore, as a result of these loose ends film is unwound from the bales as the bales are handled, therewith exacerbating the aforedescribed problems and may cause the plastic sheet applied to the bale to lose some of its sealing effect.
SUMMARY OF THE INVENTION
The present invention provides a simple and effective solution to the aforesaid problems and enables the plastic film applied to be better utilized, among other things.
The invention thus relates to a method wherein a plastic web is taken from a magazine and wrapped around a body and wherein the plastic web is gripped at a web part adjacent the body while the web is running transversely to a longitudinal axis of the body.
The invention also relates to an arrangement including devices for applying a plastic web to a body, devices for gripping the plastic web, devices for severing the web, and devices to grip the web at a web part adjacent the body while the web is running tangentially to the body and transverse to a longitudinal axis of the body.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to exemplifying embodiments thereof and also with reference to the accompanying drawing, in which
FIG. 1 illustrates schematically a first embodiment of an inventive arrangement as seen in the direction of the longitudinal axis of a body to be wrapped and in the width direction of the web of plastic film, wherein although the web is intended to be gripped it is shown in a free state, with the devices for gripping the plastic web shown in an inactive state;
FIG. 2 illustrates the arrangement of FIG. 1 and shows web gripping means in an active gripping state;
FIG. 3 illustrates the web gripping devices of FIG. 1 schematically and from the left in FIG. 1;
FIG. 4 illustrates the web gripping devices of FIG. 2 schematically and from the left in FIG. 2;
FIG. 5 is a schematic vertical section view of the gripping devices shown in FIG. 2;
FIG. 6 illustrates the gripping devices of FIG. 2 schematically and from above in FIG. 2;
FIG. 7 illustrates schematically an inventive device for activating and deactivating stretching of the plastic web; and
FIG. 8 illustrates schematically a further inventive device for activating and deactiv
REFERENCES:
patent: 4077179 (1978-03-01), Lancaster et al.
patent: 4461136 (1984-07-01), Hudson et al.
patent: 4514955 (1985-05-01), Mouser et al.
patent: 5054263 (1991-10-01), Maki-Rahkola et al.
patent: 5189866 (1993-03-01), Krutza
patent: 5450711 (1995-09-01), Martin-Cocher
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