Package making – Wrapping machines – Cinched or wiped around initial wrap
Patent
1989-07-27
1991-08-27
Spruill, Robert L.
Package making
Wrapping machines
Cinched or wiped around initial wrap
53587, B65B 1104, B65B 2712
Patent
active
050422251
DESCRIPTION:
BRIEF SUMMARY
This invention relates the packaging of bulk materials formed into a bale, pack or the like.
In particular, the present invention is concerned with but not restricted to the handling of baled material such as straw or silage or other material in like divided form for use as animal feedstock.
In relation to the handling of baled material for use as feed material for animals it is a common practice to feed animals during the winter or other periods when it is not possible for the animal to feed in the open with a feed stock commonly called silage which is produced from for example, alfa, grass, hay and straw by a process in which the wilting straw or hay undergoes a controlled bacteriological change process for the success of which it is essential to exclude atmospheric air in order to avoid the risk of the material rotting or otherwise decaying in such fashion as to render the material unsuitable as a feed for animals.
There are a number of methods of storing the hay or straw for the purposes of silage production including large storage containers known as silos which comprises substantially sized and highly expensive structures.
In view of the expense and other factors involved with the maintenance of such structures, these structures are generally speaking not readily usable by other than very large farms or the like or suitable where relatively small quantities of feed are required at a particular point of time.
In order to make the production of silage a convenient and economic possiblity by those having relatively small herds of cattle and thus a relatively small feed demand at any one time or those who prefer not to utilise large permanently erected structures for silage production a silage producing technique has been introduced which involves forming bales of the hay or straw and then hermetically enclosing the bale in a plastics material so that the requisite silage production processes can take place within the container of plastics material.
One method of hermetically enclosing the bale is to introduce the straw or hay into a plastics bag and then seal the bag. It has been found that whilst the process of introducing the bale into a plastics bag appears to be relatively simple operation difficulties have been found in the utilsation of such containers, including those arising from the problem of ensuring a hermetic sealing of the container.
With a view to ovecoming such difficulties it has been proposed to wrap bales by means of a continuous strip of plastics material one of whose characteristics of use is that it has to be pre-stretched by an optimum amount in order that it will be effective as a a bale wrapping material. The bale is wrapped in such manner that the baled material is effectively totally enclosed or shrouded in several layers of the plastics strip. To achieve the required wrapping it is necessary to wrap the bale in such manner that all air is excluded from the baled material and that respiration of the baled material is prevented.
In order to obtain and ensure the requisite air tightness the wrapping strip of plastics material, which is delivered to a wrapping position from a reel thereof has to be maintained under a tension controlled within predefined limits. In addition, in order to achieve the total plastics enclosure it has been found necessary to be able to rotate the bale about two axes at right angles to each other. In the case of the so-called `big` bale which has a cylindrical shape it is necessary to rotate the bale about its longitudinal axis and also about a second axis transverse to the longitudinal axis and passing through the centre of the bale. In addition, the rotation of the bale in these two directions of rotations is such that the each part of the surface thereof is progressively moved into a setting in which it can be brought into the wrapping position. It is also to be noted that the preferred wrapping technique is in the end-to-end sense accompanied with rotation of the bale through a predetermined angle about its longitudinal axis at the finish of each en
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Drury David J.
Drury Norman
Johnson Linda B.
Reynolds Locke
Spruill Robert L.
Wrap-A-Round Limited
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