Stretch laminate
AssigneeGolden Phoenix Fiberweb, Inc.
InventorKenneth Cheng
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AssigneeGolden Phoenix Fiberweb, Inc.
InventorKenneth Cheng
Estimating the term…
A method to manufacture an elastic laminate is disclosed. Thermoplastic Elastomeric Material (TEM) is selected from a polymer supply and fed into an extruder. The TEM film is extruded by the extruder by passing the TEM polymer through an extrusion die head to form a TEM film layer on a carrier web provided by a carrier supply. The TEM film layer is allowed to solidify on the carrier web, thereby forming a first laminate. The first laminate is stored in a first storage prior to being delivered to a delamination unit, which delaminates the first laminate by separating the TEM layer from the carrier web. The delaminated TEM layer is stretched at least in its Machine Direction (MD) in a stretching station via a plurality of web guide means. The stretched TEM layer is positioned between a first envelope web and optionally a second envelope web prior to being delivered to a bonding unit, which connects them to form a second bonded laminate. The second bonded laminate is unstretched and stored in a second storage for a predetermined time. The stored second bonded laminate is wound under controlled tension to form a roll or spool, thereby forming the elastic laminate.
A method for manufacturing an elastic laminate, the method comprising:
The method according to any of the preceding claims, wherein said bonding step in said bonding unit (120) is heat fusion bonding or ultrasonic bonding.
The method according to any of the preceding claims, wherein said MD stretching of said TEM layer is stretching said TEM layer by at least 20% (1.2×) and less than 200% (3×).
The method according to any of the preceding claims, wherein said MD stretching of said TEM layer is resulting in a neck-down of reducing the width of said TEM layer before being stored in storage 122 to between 60% and 80% of the width prior to the delamination step.
A method according to any of the preceding claims, wherein the machine directional speed of said carrier web in said extrusion step is lower than the machine directional speed of said stretched TEM layer and said envelope webs in said bonding unit.
The method according to any of the preceding claims, further comprising the step of cross-directionally stretching said TEM layer prior to feeding it to said bonding unit.
The method according to any of the preceding claims further comprising the step of aperturing the laminate, preferably by employing hot needle aperturing.
The method according to any of the preceding claims, wherein said selecting of said TEM is made from a group consisting of modified metallocene catalyzed polyolefin, preferably polyethylene and polypropylene.
Dependencies are inferred from the claim text.