Mold-in touch fastening product

1. A male touch fastener strip comprising:

an elongated base having a thickness and defining a longitudinal direction and a lateral direction perpendicular to the longitudinal direction across the base between longitudinal edges of the base;

a field of male fastener elements each having a stem extending from a broad face of the base and a head at an upper end of the stem and overhanging the base for engaging fibers, the fastener element stems and broad face of the base together forming a unitary mass of resin;

longitudinal barrier walls rising from the broad face of the base on either side of the field of male fastener elements;

a pair of segmented walls rising from the broad face of the base, each segmented wall of the pair disposed laterally outboard of a respective nearest one of the longitudinal barrier walls, each segmented wall comprising a series of wall segments defining longitudinal gaps therebetween;

wherein each segmented wall and its nearest longitudinal barrier wall define therebetween a foam relief space for receiving a foam material, each respective foam relief space having a volume per unit strip length;

wherein each segmented wall defines a flow gap for allowing the foam material to enter the foam relief space, each respective flow gap having an area per unit strip length; and

wherein the ratio of foam relief space volume per unit strip length and flow gap area per unit strip length is between about 0.02 and 0.80 inch.

2. The male touch fastener strip of claim 1 , wherein the ratio of foam relief space volume per unit strip length and flow gap area per unit strip length is between about 0.20 and 0.50 inch.

3. The male touch fastener strip of claim 1 , wherein the ratio of foam relief space volume per unit strip length and flow gap area per unit strip length is between about 0.30 and 0.45 inch.

4. The male touch fastener strip of claim 1 , wherein the ratio of foam relief space volume per unit strip length and flow gap area per unit strip length is about 0.40 inch.

5. The male touch fastener strip of claim 1 , wherein each respective foam relief space has a width along the lateral direction of the base, and wherein the combined widths of the foam relief spaces is between 10 and 35 percent of a width of the elongated base.

6. The male touch fastener strip of claim 1 , wherein the barrier walls each have a height at least as great as that of the male fastener elements, and the series of wall segments of each of the segmented walls extends from the broad face of the base to a height not greater than that of the male fastener elements.

7. The male touch fastener strip of claim 6 , wherein the height of the series of wall segments of each of the segmented walls is at least 0.004 inch less than the height of the nearest longitudinal barrier wall.

8. The male touch fastener strip of claim 1 , further comprising a plurality of lateral barrier walls, each of the lateral barrier walls spanning a length in the lateral direction defined by facing surfaces of the longitudinal barrier walls to form fastening cells that circumscribe one or more of the male fastener elements.

9. The male touch fastener strip of claim 8 , wherein the lateral barrier walls are spaced apart from one another by between 0.3 and 0.5 inch in the longitudinal direction.

10. The male touch fastener strip of claim 1 , further comprising a respective plurality of foam disruptors extending from the broad face of the base within each of the foam relief spaces, the foam disrupters configured to disturb the structure of the foam material.

11. The male touch fastener strip of claim 1 , further comprising a plurality of a foam disrupters extending from facing surfaces of a respective segmented wall and its nearest longitudinal barrier wall.

12. The male touch fastener strip of claim 1 , wherein the flow gap area per unit strip is between about 8 and 50 percent of an effective area of the segmented wall.

13. The male touch fastener strip of claim 1 , wherein the longitudinal gaps have a maximum width along the longitudinal direction of the base, and wherein the maximum width of the longitudinal gaps is at least about 0.02 inch.

14. The male touch fastener strip of claim 1 , wherein the fastener strip comprises a chain of fastening segments, each segment comprising respective longitudinal portions of the base, the field of male fastener elements, the longitudinal barrier walls and the segmented walls, and wherein each segment is connected to at least one adjacent segment of the chain by a flexible neck of less width than the segment.