| 摘要 |
A method of making a ridge vent includes: disposing a first quantity of a polymeric material in a mold cavity; forming a first ridge vent section in the mold cavity, the first ridge vent section having a stepped end section formed across a width of the first ridge vent section at an end thereof; indexing the first ridge vent section so that it is substantially moved beyond the mold cavity but remains in contact at the stepped end section with the mold; disposing a second quantity of polymer between the mold sections; and forming a second ridge vent section which is connected to the first ridge vent section at the stepped end section. The stepped end section includes bottom tread and top tread sections, wherein the tread length of the bottom tread section has a non-uniform tread length across the width of the bottom tread section.
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