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Foam injection for accurate panel fit
Page 22
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CRAVEN Tasker (Sheffield) Ltd has introduced a new refrigerated trailer designated the Mk IV Taskold. Weighing only 8.2 tons complete with refrigeration unit, it costs over £300 less than the still-current Mk III model which offers a low floor height due to the design of the insulated floor section.
The side walls are of an alloy, machine-riveted construction which is said to ensure consistency of manufacturing standards. The floor of the insulated body employs welded corrugated alloy sections which join ribbed kick panels on each side to form a watertight pan above the block polyurethane foam insulation.
For models which offer support in the roof section, the inner and outer panels of the side walls are separated by load-bearing, heat-arresting, fibrous support members at intervals, providing cavities to accept 100mm (4in) of insulation.
The I-beam sections used in the roof construction have been tested with up to 47.5 tons static load imposed upon them with a resultant deflection of less than 8mm (0.31in).
To ensure a low temperature loss, a process of low pressure foam injection has been developed which keeps any panel distortion due to heat build-up during manufacture within acceptable levels.
The alloy panels also derive some benefit from the stickiness of the foam, which offers support and increases resistance against impact as well as decreasing the possibility of panel pant, which can cause water and other unwanted matter to be drawn into the cavity.
Extensive tooling in the construction of the rear door aperture provides a high degree of dimensional accuracy so that pre-moulded GRP foam-filled door panels can employed on the inside of 1 rear doors.
With a full 100mm (4i thickness of polyuretha foam insulation, an inten width of 2.27m (7.48ft) achieved. Within an over height of 4m (13.1ft), an insi height of 2.22m (7.29ft) alio 2.15m (7.06ft) of hanging six below the meat rails, whict attributed to the low loadi height of 1.65m (5.4ft).
The running gear, cic coupled mono-leaf suspensii is plated at 18.5 tons or, wide-spread mono-leaf si pension, at 20 tons.