Method and apparatus for producing a breathable web and relative web

Patent metadata

Field	Value
Publication number	US-10894386-B2
Application number	US-201816141610-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Oct 20, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A method for producing a breathable web, comprising: feeding a web on the surface of an anvil roller rotatable about its axis and having a plurality of welding protrusions cooperating with a welding element, welding said web at a plurality of welding spots on head surfaces of said welding protrusions and forming respective annular welding seams at said welding spots, about respective welding projections, and respective thin membranes located within said annular welding seams and adjacent to the head surfaces of said welding protrusions, and removing said thin membranes after said welding by means of a peeling roller having an outer surface tangent to said head surfaces of said welding protrusions.

First claim

The invention claimed is:

1. A method for producing a breathable web, comprising:
feeding a web on the surface of an anvil roller rotatable about its axis and having a plurality of welding protrusions cooperating with a welding element;
welding said web at a plurality of welding spots on head surfaces of said welding protrusions and forming respective annular welding seams at said welding spots, about respective welding projections, and respective thin membranes located within said annular welding seams and adjacent to the head surfaces of said welding protrusions; and
removing said thin membranes after said welding by means of a peeling roller having an outer surface tangent to said head surfaces of said welding protrusions.

2. A method according to claim 1 , wherein said peeling roller is rotatable about an axis parallel to the rotation axis of said anvil roller.

3. A method according to claim 1 , wherein said peeling roller is rotatable about its axis in a direction concordant to the rotational direction of the anvil roller.

4. A method according to claim 1 , wherein said peeling roller has a peripheral velocity greater than the peripheral velocity of the anvil roller.

5. A method according to claim 4 , wherein the peripheral velocity of said peeling roller is at least 10% greater than the peripheral velocity of the anvil roller.

6. A method according to claim 1 , wherein said peeling roller has a plurality of herringbone ribs on its outer surface having a relative movement from the inside outwards with respect to the head surfaces of said welding projections of the anvil roller.

Assignees

• Fameccanica Data Spa

Inventors

• D'Aponte Francesco
• Lupinetti Serafino

Classifications

• A61F13/64 Primary

  Straps, belts, ties or endless bands ({A61F13/5605, A61F13/5622}, A61F13/66 take precedence) · CPC title

• B29C66/83415

  the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle (B29C66/83433 takes precedence) · CPC title

• A61F2013/15869

  with ultrasonic energy · CPC title

• A61F13/15739

  Sealing, e.g. involving cutting · CPC title

• B29C66/221

  being in the form of a sinusoidal wave (B29C66/2272 takes precedence) · CPC title