| 摘要 |
The disclosure relates to an improved core for holding web material. The core includes a cylinder having an axis of rotation and an axially extending slot for receiving the web material, a rectangular collar within the cylinder to form an annular channel and an annular channel floor between the cylinder and the column to maintain a substantially concentric relation there between. The core also includes first, second and third tapered rib members for positioning the web material within the annular channel and a channeled wall member mounted on the rectangular collar opposite a tapered rib member; a post is included within the annular channel in combination with a fourth tapered rib member adjacent thereto. A labyrinth of web material formed by threading an end of the web through the slot into the annular channel along the outer peripheral surface of the rectangular collar, adjacent a first tapered rib member, between a second tapered rib and the channel wall member, adjacent a third tapered rib around the post and adjacent the fourth tapered rib member winding back through the channel and out the slot. The cooperative action of the restraining effect of the post and adjacent wall on the web material, the extended frictional contact between the resulting two layers of web material and the frictional engagement of the web material about the outer peripheral surface of the rectangular collar securely restrain the web to the core during both winding and unwinding operations.
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