Package making – Methods – Applying a partial cover
Patent
1997-11-17
1999-07-27
Johnson, Linda
Package making
Methods
Applying a partial cover
53587, 53215, B65B 1316, B65B 1104
Patent
active
059270470
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relatqs to a device and a method for the application of a wrapping round a cylindrical roll of bags.
DESCRIPTION OF THE PRIOR ART
In the production of rolls of bags, for instance rolled-up plastic bags, the production line is normally composed of a number of machines which are connected in series and each of which performs at least one operation. The production line may, for instance, begin with a so-called bag machine, to which is fed an elongate material web in the form of a double plastic film. The bag machine makes transverse, bag-defining perforation lines and welding lines in the plastic web.
U.S. Pat. No. 950,217 teaches such a bag machine, which has d driven roll nip by means of which the plastic web is fed into the machine. The bag machine is equipped with a rotary knife means for producing perforation lines, as well as movable welding means for producing welding lines.
After the bag machine, there is usually provided a machine for winding plastic bags into rolls, this machine being commonly referred to as a spinner. U.S. Pat. No. 858,844 discloses such a machine, in which a free end of the plastic web is fed into a special device for winding up the web into a roll of bags. When a predetermined web length, or a predetermined number of bags, has been sensed, a clamping device clamps the web in operation, and the web is immediately torn in two along a perforation line. After a delay, the new free end of the web is gripped by a gripping device prior to yet another winding operation.
If the resulting roll of bags is to be provided with a wrapping keeping it together round its circumferential surface, the production line normally ends with a wrapping machine. This machine comprises a unit for supplying a web, for instance a paper web, which is to form the wrapping, a unit for cutting the paper web into web sections of suitable length, as well as a unit for conveying the web sections to the winding machine.
When a roll of bags is to be provided with a wrapping, a paper-web section is conveyed up to the roll of bags before the latter is completely wound up in the winding machine. Before the plastic web is torn in two along a perforation line, the free end portion of the web section is inserted into and clamped in the fold between the plastic web and the partly wound-up plastic roll. When the plastic roll is further rotated, the plastic web is torn in two along a perforation line in the manner described above, the web section clamped in the roll of bags being wound round this roll. After the winding has been completed, the wrapping is fixed, for instance by means of glue dots applied beforehand.
A prior-art wrapping machine is disclosed in the applicant's brochure "FAS Classic", 1993, which also describes the bag machine and the winding machine discussed above. Together, the bag machine and the winding machine form a production line for rolls of bags, the plastic web being fed through the machines in one direction. The wrapping machine is arranged after the production line, and its paper web is fed in a direction opposite to that of the plastic web. Thus, the two webs thus meet in an interface between tile wrapping machine and the winding machine, the rolls of bags being here provided with a wrapping.
However, the prior-art machine for applying a wrapping round rolls of bags suffers from a number of drawbacks. Thus, one. serious drawback is that the machine is dependent on the other machines in the production line. The fact that the wrapping machine must, In operation, be connected to the winding machine means that no intermediate storage of rolls of bags is possible. As a result, the production becomes less flexible than would be desired.
In addition, this combination of machines makes it difficult to stretch the web section round the roll of bags. For this reason, the free end portion of the web section has to be fixedly connected to the roll of bags before the web section is wound round the roll of bags, since there would otherwise be a considerable risk
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"Fas Classic" Pamphlet.
FAS Converting Machinery AB
Johnson Linda
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