Title: Apparatus for manufacturing a wrapper web provided with a tear-open strip

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Abstract: Apparatus for manufacturing a wrapper web provided with a tear-open strip is disclosed. A web of wrapper material is fed along a generally planar guide path and two parallel incisions are made in the web to separate a narrow central strip of material therefrom. This narrow strip is raised out of the planar guide path, along which the two edge pieces on each side of the narrow strip continue to be fed. The two edge pieces are urged towards one another until mutually facing edges of the two edge pieces abut against one another below the centre of the narrow strip. The narrow strip is then guided back into the planar guide path so that it overlaps longitudinal edge portions of the two edge pieces, to which the narrow strip is adhesively or heat bonded to provide a web having a tear-off strip. The present invention relates to apparatus for manufacturing a wrapper web of viscose foil, or similar stickable or weldable wrapper material, provided with a tear-open strip. It is known to provide apparatus for cutting a tear-open strip from one edge of a web of wrapping material whilst the web is guided in a generally planar guide path. The strip after being severed from the remainder of the web is then guided out of the general plane of the web feed path and displaced laterally to overlie the remainder of the web. The strip is then heat welded to the remainder of the web to provide a tear-open strip. However, the resulting web is dependent on the effectiveness of the bond between the strip and the remainder web to effect actual tearing of the material of the remainder web, when the tear-open strip is torn off, if a package wrapped in a web provided with tear-off strip of such known construction is to be opened effectively. According to the present invention there is provided apparatus to manufacture a wrapper web provided with a tear-open strip, the apparatus comprising feeder means to feed a web of wrapper material in a given direction along a first path including a planar portion, cutter means comprising two cutter elements disposed at a predetermined spacing apart in a direction perpendicular to said given direction and adapted to make mutually parallel longitudinally extending incisions in said web of wrapper material to sever therefrom a strip having its width defined by said predetermined spacing and on each of mutually opposite side of said incisions to leave a respective web piece having a width substantially greater than that of said strip, first guide means to displace said strip out of the plane of said planar portion of said first path and to guide said strip along a second path, said second path being convergent with said planar portion of said first path downstream of said first guide means, second guide means having respective guide elements spaced apart in a direction perpendicular to said given direction at a distance substantially equal to the sum of the respective widths of said web pieces, said guide elements being operatively associated with said planar portion of said first path downstream of said first guide means to guide said web pieces into mutually abutting edge-to-edge relationship, third guide means operatively associated with said planar portion of said first path downstream of said first guide means to guide said strip into overlapping relationship with longitudinally extending and mutually next adjacent edge portions of each of said web pieces in said planar portion of said first path, and connector means to connect said strip -- when in said overlapping relationship -- to each of said edge portions.


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