| 摘要 |
A new and improved pig is disclosed. In the preferred embodiment, the pig is constructed of a foamed plastic body which is elongate, shaped somewhat like a bullet and which body is wrapped with spiraled cloth which is joined into the bullet shaped body by the elastomeric material which forms the body. The cloth material is a backing for metal staples which are U-shaped and which position pairs of parallel points extending outwardly. They form collectively an abrasive surface on the body which enables it to clean a pipeline. An improvement is incorporated wherein an additional coat of elastomeric material encapsulates the staples, supporting them in a fixed relative position to one another and which additional coating material is on the exterior of the belting to support the staples.
|
