US 2024/0199361 A1 · UNWINDER AND OPERATING METHOD FOR UNWINDING WEB MATERIALS FROM PARENT REELS

Abstract

Method for unwinding web materials from two parent reels (1, 2), wherein a first parent reel (1) in a depletion phase is replaced by a second parent reel (2), wherein during said replacement a first and a second web material (N1, N2) are unwound from both parent reels, wherein before the completion of said replacement the first web material (N1) is joined to the second web material (N2) and then it is cut, wherein the joining of said web materials (N1, N2) is preceded by the insertion of the second web material in an area where the two web materials are joined, and during the step of inserting the second web material in said joining area the second web material is guided on a guide surface (41, 44) which guides it towards the joining area. In said insertion step, the second web material adheres pneumatically to guide surface.

Claims13

Dependent claims

Method for unwinding web materials (N1, N2) from two corresponding parent reels (1, 2), wherein a first parent reel (1) in a depletion phase is replaced by a second parent reel (2) which takes the place of the first parent reel at the end of the replacement, wherein during said replacement a first and a second web material (N1, N2) are unwound from both parent reels, wherein before the completion of said replacement the first web material (N1) is joined to the second web material (N2) and then it is cut, wherein the joining of said web materials (N1, N2) is preceded by a step of inserting the second web material (N2) in an area where the two web materials (N1, N2) are joined, wherein during the step of inserting the second web material (N2) in said joining area the second web material (N2) is guided on a guide surface (41, 44) which guides it towards said joining area, characterized in that, in said insertion step, the second web material (N2) adheres pneumatically to said guide surface.

Unwinder configured for unwinding web materials (N1, N2) from respective parent reels (1, 2) comprising:

a structure on which support members adapted to support a first parent reel (1) and a second parent reel (2) in different positions are formed, said support members being configured for supporting the parent reels (1, 2) during rotation of the same about respective longitudinal axes;
motorized dragging means configured to control the rotation of said parent reels (1, 2) with a predetermined angular speed around the respective longitudinal axes;
joining means for joining together the web materials (N1, N2) unwound from the parent reels (1, 2) when one of them, in a phase of depletion, must be replaced with the other;
means for transferring a parent reel from a waiting position (P2) to an operating position (P1) when the diameter of a parent reel arranged in the operating position (P1) reaches a predetermined minimum value;
means for transferring a parent reel from the operating position (P1) to a removal position (P3) when the other parent reel is transferred from the waiting position (P2) to the operating position (P1);
a guide surface (41, 44) configured to guide the web (N2) unwound from the reel (2) of the waiting position (P2) towards said joining means;
characterized in that it further comprises:
pneumatic means (7;
8) that can be activated to produce, on the web material (N2) unwound from the reel (2) of the waiting position (P2), a pressure or suction directed towards the guide surface (41, 44) while the latter guides it towards the joining means.

6 more elements

Dependencies are inferred from the claim text.

Unwinder and operating method for unwinding web materials from parent reels

Life of this patent

Unwinder and operating method for unwinding web materials from parent reels

Life of this patent

Abstract

Claims13