Wound dressing, and method and production line of producing the wound dressing

A wound dressing comprising:

• a polyurethane film sheet having a wound facing side and an opposite side;
• the wound facing side having a peripheral rim zone provided with an adhesive;
• the peripheral rim zone encircles a central sheet part free of adhesive;
• the wound dressing has a moisture vapor transmission rate of at least 1,200 g/m2/24 hour at the peripheral rim zone and a moisture vapor transmission rate at the central sheet part of at least 3,000 g/m2/24 hour;
• and
• a frame part encircling at least a part of the central sheet part.

A method for manufacturing a wound dressing, the method comprising:

• providing a width of a first laminate having an adhesive provided thereon;
• providing through-openings through the first laminate;
• delaminating the width of first laminate to expose the adhesive;
• providing a width of a second laminate having a polyurethane film with a moisture vapor transmission rate of at least 3,000 g/m2/24 hour, the polyurethane film being supported by a carrier;
• producing a third laminate of wound dressing material by laminating the width of second laminate to the delaminated width of first laminate having the through-openings to apply the adhesive to the polyurethane film to thereby obtain a moisture vapor transmission rate of at least 1,200 g/m2/24 hour through a part of the wound dressing material which includes the adhesive;
• and
• from the third laminate of wound dressing material providing a wound dressing with a peripheral rim zone provided with the adhesive, the peripheral rim zone encircling a central polyurethane sheet part which is free of adhesive on both sides.

A production line for manufacturing a wound dressing, the production line comprising:

• a first station for unwinding a first laminate, the first laminate having an adhesive;
• a second station for providing through-openings through the first laminate;
• a third station for delaminating the first laminate to expose the adhesive;
• a fourth station for providing a width of a second laminate, the second laminate having a polyurethane film with a moisture vapor transmission rate of at least 3,000 g/m2/24 hour, the polyurethane film being supported by a carrier;
• a fifth station for laminating the second laminate to the delaminated first laminate to provide a third laminate of wound dressing material having a moisture vapor transmission rate of at least 1,200 g/m2/24 hour through both the adhesive layer and the polyurethane film;
• and
• an end cutting station for separating out the wound dressing from the third laminate.