points 56 and 58 where the yarn intersects the center line through the base fabric 30 in addition to considerations regarding the number of crimps per inch in the machine direction yarns it is necessary to consider the number of ends or machine direction yarns which are adjacent to each other in one inch of cross machine direction width based upon this relationship and full consideration of the weave construction it is possible to establish the join area which will be necessary for a given construction in order to more fully understand the invention reference is made to the following example in a sample fabric which was a single layer plain weave fabric having fifteen picks per inch of 0 019 34 diameter monofilament each inch of machine direction yarn interacted with approximately fifteen picks or cross machine direction yarns in appreciation of the fact that each crimp requires two knuckles a plain weave of this type yielded approximately 7 5 crimps per inch of machine direction yarn the machine direction yarn count was approximately thirty six ends per inch of 0 019 34 diameter monofilaments based on these yarn counts each square inch of fabric yields approximately 270 crimps with this fabric construction it was found that a suitable join could be established across the width of the fabric over a maximum machine direction length of 4 5 inches with reference to fig2 and 3 it can be seen that as the construction of the base fabric 30 is modified to include longer floats on one or both surfaces the length of crimp 50 increases accordingly the number of crimps available per inch of machine direction yarn is reduced in the construction of fig2 of.