Netting material and a round baler using the material

Abstract: A baler 1 comprises a forming mould 3 into which the material 4 to be compressed is brought. The strip of material 4 moves through the opening 5, arrives in the forming mould and, with the aid of driving means, is compressed to a bale. Netting material 9 which is placed on a supply roll 8 is fed with the aid of transport rolls 10, 11 to the forming mould 3 and there wound around the bale. The breadth of the netting material transverse to the feeding direction is according to the invention greater than that of the forming mould 3. Through use of the invention the edge zones of the net are turned over the end faces of the bale and, owing to the elasticity, the net draws itself firmly around the formed bale.

Description: The invention relates to netting material for a baler, as described in the preamble of claim 1. From FR-A-2,530,406 is known a baler and netting material which is used for the formation of bales of straw or hay. The netting material is elastic at least at the borders. In practice it has proved that when the netting has been wound roughly three times around the formed bale, the cooperation between the netting material and the more or less elastic baled material results in the bale having sufficient cohesion. Nonetheless, the known baler and the netting material used thereby have several disadvantages. The completed bale bound in netting is vulnerable at the end faces, particularly at their edges, with the result that there is a tendency for the bale to disintegrate after formation. Moreover, during the binding of the bale, the actual bale-forming operation of the baler is interrupted. The formation of a new bale can only be commenced after the previously formed bale has been enwrapped and ejected. The invention has for its aim to counter these disadvantages by providing an improved netting material. This is achieved by using a netting material as described in claim 1 together with a baler of the kind described in the preamble with the measures according to the characteristic of claim 4. Through the measures adopted, edge zones of the net are wrapped around a part of the end face of the formed bale, and owing to its elasticity the net draws itself tight around the formed bale in such manner that it is sufficient to wind the netting for only a limited distance around the bale, without disintegration taking place. By preference the measures according to claims 2 and 5 are adopted. Since netting with a length of only 1½ times the circumference of the formed bale has to be wrapped around the bale, a considerable time saving is achieved. The bale formation process can take place in a more continuous manner than previously. The measures according to the characteristic of the other claims can be applied either separately or in combination. The invention will be elucidated by reference to the accompanying drawings. In the drawings: Figure 1 shows a cross-sectional view of the baler according to the invention; Figure 2 shows a perspective view of a part of the apparatus of figure 1; Figure 3 shows an example of the netting material to be used; Figure 4 shows a detail of the netting material to be used, The baler 1 according to the invention has means in the form of a feeder roll 2 for the supplying to the forming mould 3 of a strip of the material 4 to be baled. The strip 4 passes through a supply opening 5 and then arrives in the roughly circular mould along the wall of which driving means in the form of a succession of relatively short circulating belts 6, 6' , 6'' are disposed. Owing to these driving means 6, 6', 6'' the material to be compressed is rotated and thereby formed into a bale, the radial edge zone of the bale thus acquiring a greater compactness than the core. Arranged on a supply roll 8 is netting material 9, which is to be wrapped around the formed bale 7. By means of cooperating transport rollers 10, 11, the netting 9 which is pinched between the transport rollers is fed to the forming mould 3 in order to be wound around the formed bale. When the netting has been wrapped roughly 1½ times around the formed bale, the portion concerned is separated by means of the blocking of the rollers 10, 11 and through the presence in the netting material of weakened zones at intervals of approximately 1½ times the circumference of the bale. Thereafter flap 12 is opened and the bale falls out of the baler. According to the invention the breadth of the netting material transversely to the feeding direction is greater than the breadth of the forming mould 3 or where appropriate the bale 7 to be formed and moreover the netting material is elastic in the longitudinal direction, at least at its borders. Figure 3 shows an embodiment of the netting material to be used comprising a mesh-like material of which the borders in a longitudinal direction include elastic filament 13, 14. Figure 4 shows a weakened zone 16 in the netting material according to figure 3, for the purpose of ensuring that the netting will break on the exertion of a tensile force at that position. This weakening may be made by local heating of the netting material either during manufacture or during use in the baler.

Claims: Netting material for wrapping a bale in a baler, wherein the material is elastic at least at the borders, characterized in that the borders of said material include an elastic filament (13, 14) running in the longitudinal direction of the netting material. Netting material as claimed in claim 1, characterized in that a weakened zone is made in the netting material at intervals in the longitudinal direction of approximately 1 1/2 times the circumference of the forming mould (3). Netting material as claimed in claim 2, characterized in that the weakened zone is made by local heating. Baler (1) with an apparatus (2) for the feeding to a forming mould (3) of the material to be compressed (4), driving means (6, 6', 6'') for causing the circulation in the forming mould (3) and the formation to a bale (7) of the material, a supply roll (8) carrying netting material (9) according to claim 1 or 2, means (10, 11) for withdrawing from the supply roll (8) and feeding to the forming mould (3) of the netting material, means for the separation of a portion from the netting material (9) on the supply roll (8) and means (12) for the delivery from the baler (1) of the formed bale (7), characterized in that the breadth of the netting material is greater than that of the forming mould (3). Baler as claimed in claim 3, characterized in that the means (10, 11) for the separation of the portion of the netting material come into operation after a portion has been fed with a length of approximately 1 1/2 times the circumference of the forming mould (3). Baler as claimed in claim 4, characterized in that the separation means consist of a blocking device for the supply roll (8).

Inventors: VAN DEN WILDENBERG LEONARDUS J, VAN DEN WILDENBERG, LEONARDUS JOHANNUS
Applicants: GREENLAND GELDROP BV, GREENLAND GELDROP B.V.
Application year: 1988
Main classification: A01F15
IPC codes: A01F15, B65D65, B65B25