Elastic film laminate and method of forming the same
An elastic panel for use in an absorbent article including a first nonwoven web layer, a second nonwoven web layer and an elastomeric film layer disposed between the first and second nonwoven layers. At least one of the first and second nonwoven web layers includes at least one group of folded portions. Each folded portion includes a first fold line and a second fold line so that the folded portion is divided into a proximal section, a distal section and a medial section disposed between the proximal and distal sections. The proximal section is directly attached to the elastomeric film layer and the medial and distal sections are not directly attached to the elastomeric film layer so that the folded portions extend to allow the web panel to stretch elastically.
1. A method of forming an extendible web panel:
forming at least one group of folded portions in at least one nonwoven web layer, each folded portion having a flattened, Z-configuration comprising a first fold line and a second fold line so that the folded portion is divided into a proximal section, a distal section and a medial section disposed between the proximal and distal sections; and
attaching the at least one nonwoven web layer to an elastomeric film layer so that the proximal section of each folded portion is directly attached to the elastomeric film layer and the medial and distal sections of each folded portion are not directly attached to the elastomeric film layer and so that the folded portions extend to allow the web panel to stretch elastically.
2. The method of claim 1 , wherein the at least one nonwoven web layer comprises a first nonwoven web layer and a second nonwoven web layer.
3. The method of claim 2 , wherein at least one of the first and second nonwoven web layers comprises at least one end portion that is substantially planar.
4. The method of claim 3 , further comprising the step of bonding the at least one end portion to at least one of the elastomeric film layer and the other one of the first and second nonwoven web layers.
5. The method of claim 2 , further comprising:
forming at least one other group of folded portions in at least one of the first and second nonwoven web layers, each folded portion of the at least one other group of folded portions comprising a first fold line and a second fold line so that the folded portion is divided into a proximal section, a distal section and a medial section disposed between the proximal and distal sections;
attaching the at least one of the first and second nonwoven web layers to the other one of the first and second nonwoven web layers so that the proximal section of each folded portion of the at least one other group of folded portions is directly attached to the other one of the first and second nonwoven web layers and the medial and distal sections of the at least one other group of folded portions are not directly attached to the other one of the first and second nonwoven web layers and so that the folded portions of the at least one other group of folded portions extend to allow the web panel to stretch non-elastically.
6. The method of claim 1 , wherein the at least one group of folded portions comprises a plurality of groups, and the at least one nonwoven web layer comprises generally planar sections between the plurality of groups.
7. The method of claim 1 , further comprising the step of bonding together at least two of the proximal, medial and distal sections of the folded portions.
8. The method of claim 7 , wherein the bonding comprises ultrasonic bonding.
9. The method of claim 1 , wherein the proximal section of each folded portion is directly attached to the elastomeric film layer by adhesive.
10. The method of claim 1 , wherein the proximal section of each folded portion is directly attached to the elastomeric film layer by ultrasonic bonds.
11. The method of claim 1 , wherein the elastic panel is a fastener of an absorbent article.