Page 47 - 2010-2022 hose manufactureing ability and guide

Wrap Cure Open Cure

The wrap cure process uses a closely woven Open or pan cure is the simplest of rubber
textile fabric tape generally 2" to 4" in width, hose vulcanization techniques. Essentially, the
wrapped spirally around the uncured hose and hose is taken from the covering operation,
steam vulcanized. This fabric tape, generally coiled either on reels or horizontal pans and
nylon, is overlapped sufficiently that along with placed directly into the vulcanizer. Obviously,
the shrinkage properties of the textile, provide without any protective or compressive sheath
compaction forces to the hose bonding the during cure, this process is limited to products
components during cure. The tape is removed of one or two ply and 1" ID or less, either non-
and recycled after cure. The rough surface of mandrel or flexible mandrel. If non-mandrel, a
the tape creates a similar rough finish on the water or air charge may be used inside the hose
hose. Wrap curing is used for flexible or rigid for support during cure.
mandrel constructions in virtually all sizes. Curved Hose
Figure 2-19 shows a late model wrapper.
For certain applications, such as automotive
coolant hose, a curved or shaped configuration
is required for the hose. In these cases, the
uncured hose is cut to the specified length,
installed on a metal mandrel that is the same
shape as the finished part, open steam
vulcanized, and then removed from the
mandrel. Because the hose is cured in this
configuration, it retains the shape of the
mandrel. Figure 2-20 shows a typical curved
hose/mandrel process.

Figure 2-20

Figure 2-19

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