Method for manufacturing a cover layer of a fleece material for an innerspring unit and innerspring unit

A method of manufacturing a cover layer of a fleece material for an innerspring unit, comprising the steps of:

• supplying at least two longitudinal fleece webs, which extend substantially parallel in a longitudinal direction and are spaced from one another;
• repeatedly attaching a transverse fleece web, which extends between the longitudinal fleece webs in a direction substantially perpendicular to the longitudinal direction, to the longitudinal fleece webs, the transverse fleece web attached to the longitudinal fleece webs forming together with the longitudinal fleece webs a frame-like structure serving as the cover layer;
• wherein the step of repeatedly attaching the transverse fleece web is carried out while the longitudinal fleece webs are conveyed in the longitudinal direction by a respective conveyor;
• wherein the step of repeatedly attaching the transverse fleece web comprises the following steps repeatedly performed for each transverse fleece web of the frame-like structure:
• holding the transverse fleece web with a holding device and positioning the transverse fleece web with the holding device at the longitudinal fleece webs;
• attaching the transverse fleece web adjacent to a first transverse edge of the transverse fleece web to the longitudinal fleece webs;
• releasing the holding device so that the transverse fleece web attached to the longitudinal fleece webs is conveyed together with the longitudinal fleece webs;
• cutting the transverse fleece web to a desired width in the longitudinal direction to obtain a second transverse edge of the transverse fleece web;
• and attaching the transverse fleece web adjacent to the second transverse edge to the longitudinal fleece webs.