MATERIALS PREPARATION | TECHNOLOGY
loader can be used when conveying hygroscopic materials with small throughputs or where space is limited.
Swift dryers The drying bins used by the SCompact are made of stainless steel and are completely insulated, including the drying bin cone and material discharge, which ensures stable conditions in the bin and saves energy. The bins are mounted on a stable frame and are equipped with especially large cleaning doors with an inspection window to optimise material flow within the unit and make cleaning easier. A three-phase side channel blower is used for conveying. The blower is installed directly in the dry air generator. Motan has also launched under the
Swift brand the SDry 250 flexible dry air dryer, which has a dry air capacity of 250 m3
/hr and can be operated with either a single drying bin or combined with multiple pre-config- ured drying bins from 100-900 litres. The SDry 250 dryer is equipped with two fully insulated, stationary desiccant beds which have large amounts of molecular sieve that allow for long drying cycles with constant and stable dry air quality. The dryer has a regeneration air cooler that actively cools the regeneration air during cooldown, enabling the dryer to achieve very low and consistent dew points while providing a short regeneration time, says Motan. Regeneration of the molecular sieve is triggered when the maximum dew point set value of the return air has been reached. The user defines the set point value. Motan offers a hybrid drying mode when the
larger 600- or 900-litre drying bins are used and when both desiccant beds are operating in-pro- cess simultaneously, after the completion of the regeneration cycle. Dry air flow can be boosted up to 300 m3
/hr, allowing drying times and material
throughput to be optimised. Heating of the process air takes place directly in the drying bin and is individually adjustable. Cold dry air generators in each drying bin provide the individual drying temperature required. Motan says there is no energy loss in the dry air piping from the dry air generator to the hopper. Air distribution is ideally positioned in the hopper to ensure even distribution. The design of the air distribution also
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keeps material already at the machine infeed dry and at temperature. The drying bins are made from stainless steel, mounted to a stable frame, and are completely thermally insulated, including the material inlet. The drying bins have a front control box for optimum accessibility. The SDry 250 uses microprocessor control and a
user-friendly graphics interface on a 7-inch touchscreen colour display panel. The display always shows the current drying status. Dew point control and return air cooling functions can be added as an option. An integrated materials database allows for the selection of material-de- pendent preset drying parameters that enables ideal processing of the specific plastic granulate. Matsui launched its new MJ6-i dehumidifying dryer as a replacement to the MJ5-i model it will now discontinue. The new unit, available in four models, provides dehumidifying air with a stable low dewpoint of -40C or lower to remove moisture contained in resins. The dryer uses a honeycomb desiccant rotor design to create the stable drying conditions. Moisture in the air is removed with an absorbent to create dehumidi- fied air, which is heated and supplied to the hopper to remove moisture contained in the resin. Replacement of the absorbent is not required. The drying unit is designed with an advanced self-control function that autonomously and continu- ously monitors the drying opera- tion and adjusts the air flow volume
to create the most suitable drying conditions and to prevent excessive drying of materials and yellowing of moulded products. The continuous operation method of the self-control function automatically matches the power consumption to the amount of drying required, for energy savings. It also reduces the temperature drop of the resin after drying while the air volume control also helps to realise energy savings. Other features of the MJ6-i include an improve-
ment of resin drying capacity to achieve a higher grade of drying efficiency, and the use of a push damper that prevents unnecessary heat exhaust during material discharge in the material convey- ing hoses, which also helps to reduce temperature drop after material drying. Matsui also downsized the main unit of the MJ6-i compared to the prior model by reconfiguring the internal layout of the model. The unit retains its basic performance and
March 2023 | INJECTION WORLD 35
Left: Matsui’s new MJ6-i dehumidifying dryer is
available in four models
IMAGE: MATSUI
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