JOINING/PARTING UNIT FOR FILM WEBS

Abstract

The invention describes an apparatus for separating a two-ply film web which can first be wound up at a winding point, wherein the two plies of the film web are first joined to one another via two side edges, wherein the apparatus comprises as features at least one and preferably two lengthwise slitting units, with which a lengthwise slit can be made into a first of the two plies of the two-ply film web, which are at a distance from side edges, so that the one ply is narrower than the two-ply film web, and at least one pressing element, which can be moved in the orthogonal direction of the plane defined by the two-ply film web, wherein the two plies of the two-ply film web can be spaced apart from one another, and which can be moved in the plane of the two-ply film web, but perpendicular to its longitudinal direction, so that the pressing element can be guided between the two plies of the two-ply film web.

Claims

1. Apparatus for separating a two-ply film web which can first be wound up at a winding point, wherein the two plies of the film web are first joined to one another via two side edges, wherein the apparatus comprises the following features: at least one and preferably two lengthwise slitting units, with which a lengthwise slit can be made into a first of the two plies of the two-ply film web, which are at a distance from side edges, so that the one ply is narrower than the two-ply film web, at least one pressing element, which can be moved in orthogonal direction of the plane defined by the two-ply film web, wherein the two plies of the two-ply film web can be spaced apart from one another, and which can be moved in the plane of the two-ply film web, but perpendicular to its longitudinal direction, so that the pressing element can be guided between the two plies of the two-ply film web.

2. Apparatus according to claim 1, characterized in that a parting device is provided, with which the first ply of the two-ply film web can be separated, so that a new start of the web is created.

3. Apparatus according to claim 1, characterized in that a holding device is provided, with which a lead-in tape can be held and brought close to the first ply.

4. Apparatus according to claim 1, characterized in that it comprises a joining device, with which the new start of the web and the lead-in tape can be joined to one another.

5. Method for separating a two-ply film web which is first wound up at a winding point, wherein the two plies of the film web are first joined to one another via two side edges, wherein the method comprises the following features: introducing two lengthwise slits into a first of the two plies of the two-ply film web with two lengthwise slitting units, wherein the lengthwise slits are at a distance from side edges, so that the one ply is narrower than the two-ply film web, separating the two plies of the two-ply film web from one another with at least one pressing element, which is moved in orthogonal direction of the plane defined by the two-ply film web, guiding the pressing element between the two plies of the two-ply film web, wherein the pressing element is moved in the plane of the two-ply film web but perpendicular to the longitudinal direction thereof.

Description

[0024] Further advantages, features and details of the invention will be apparent from the following description, in which different design examples are explained in detail with reference to the figures. The features mentioned in the claims and in the description can always be essential to the invention individually or in any combination of mentioned features. Within the scope of the entire disclosure, features and details described in the context of the method according to the invention naturally always also apply in the context of the apparatus according to the invention and vice versa, so that mutual reference is or can always be made with respect to the disclosure of the individual aspects of the invention. The individual figures show:

[0025] FIG. 1 a two-ply film web with two lengthwise slits

[0026] FIG. 2 the two-ply film web with pressing element

[0027] FIG. 3 the two-ply film web prior to a displacement of the pressing element

[0028] FIG. 4 the two-ply film web with the pressing element located between the plies.

[0029] FIG. 5 the situation according to FIG. 4 with an additionally depicted holding element

[0030] FIG. 6 the two-ply film web, now additionally with a joining device and a parting device.

[0031] FIG. 1 shows a two-ply film web 1 with two lengthwise slits 2, which are indicated with dashed lines. The film web moves in transport direction z. It can be seen that the lengthwise slits 2 are spaced apart from the side edge 3 at a distance A. The distance A to the nearest side edge 3 can also be different for each lengthwise slit, which does not limit the functionality of the invention. A pressing element 4 is shown as well. It is in particular possible that two pressing elements spaced apart in transport direction z are provided. A pressing element 4 can be configured as a roller, so that it rolls on the film web 1 while it is in contact with it.

[0032] FIG. 2 now shows that the pressing element has been moved in direction x (orthogonal to the plane defined by the film), whereby the pressing element is only in contact with a region of the film web 1 that lies between the side edge 3 and the next adjacent lengthwise slit 2. This makes it possible to separate the first ply 5 of the film web 1 and the second ply 6 of the film web in direction x.

[0033] FIG. 3 now indicates that the pressing element can also be moved in direction y, i.e., orthogonal to directions x and z, while keeping the plies 5 and 6 spaced apart. The result is shown in FIG. 4. In this view, the pressing element is under the ply 5 but above the ply 6.

[0034] In FIG. 5, a holding device 7 can now be seen, on which a lead-in tape 8 is held on the side facing the film web. The holding device can now be moved in direction-y, so that the lead-in web is above the first ply 5. This can be seen in FIG. 6. FIG. 6 also shows a joining unit 9 and a parting unit 10. These can be disposed together on a carrier 11, which can be positioned between the two plies 5 and 6. The joining unit can now be used to press and join the ply 5 to the lead-in tape 8. The lead-in tape can already be provided with a double-sided adhesive tape 12, for example. The parting unit 10 can now separate the ply 5 below the joining location, which can in particular take place at the same time as the ply 5 is pressed onto the lead-in tape 8. The second winding point can now be started, so that the lead-in tape pulls the ply 5 toward this winding point, so that the first ply can be wound up there; this is not shown, however.

LIST OF REFERENCE SIGNS

[0035] 1 Two-ply film web [0036] 2 Lengthwise slit [0037] 3 Side edge [0038] 4 Pressing element [0039] 5 First ply [0040] 6 Second ply [0041] 7 Holding device [0042] 8 Lead-in tape [0043] 9 Joining unit [0044] 10 Parting unit [0045] 11 Carrier [0046] 12 Double-sided adhesive tape