Rotary fruit and vegetable blanching drum

01

Size the drum and choose the heating method

Lyco Manufacturing's brochure lists its rotary drum blanchers and cookers in 36 in (91.44 cm), 48 in (121.92 cm), 60 in (152.4 cm) and 72 in (182.88 cm) diameters, in lengths from 4 ft (1.22 m) to 28 ft (8.53 m). They can run with indirect heat, steam-heated water or direct steam, and its Vapor-Flow steam blancher switches between steam and water heat with a valve. It suggests applications for pasta, dry beans, vegetables, rice and potatoes, and says its Hydro-Flow agitation keeps product suspended for a uniform process. [1]

Lyco's patent US6205913 describes a rotary blancher with an elongated, cylindrical perforated drum inside a housing, an auger that moves food axially from inlet to outlet and rotates with the drum, about six inches of water in the bottom of the housing feeding an inlet flume, live steam injected just above the water, labyrinth seals between drum and housing, and a vacuum-assisted discharge chute that returns steam to the water supply, so the machine can run with water or with steam only. [2]

The brochure’s size list gives 60 in as 152.4 cm, while both rotary-drum photo captions print 60 in as 154.4 cm. Editorial calculation: converting the nominal 60 in at 2.54 cm/in gives 152.4 cm. Retain both source positions and obtain the model drawing from Lyco; this conversion is not a measured drum diameter. [1]

Give the supplier the products and cut sizes, throughput in kg/h, bulk density, target product temperature and blanch time, water or steam heating, steam pressure and water supply, cooling target, sanitation and CIP needs, and the line layout before and after the blancher.

02

Separate rotary cooker-cooling from the downstream particulate cooler

Lyco describes a rotary drum cooker-cooler with hot and cold zones served by a shared CIP system and says a final 40°F (4.4°C) is possible. Its separate Easy-Flow particulate cooler can have up to four stages. The brochure prints cooling-water pairs of 33°F (0.5°C) and 55°F (12.7°C). Editorial calculation: (°F − 32) × 5/9 gives approximately 0.56°C and 12.78°C respectively; the printed Celsius values are retained as source values, rather than silently treating them as exact conversions. [1]

For Easy-Flow, Lyco reports a laboratory first-stage test taking pasta and “most particulate” products from 200°F (93.3°C) to 70°F (21.1°C) in under 10 seconds using 33°F chilled water. It also describes recovering first-stage heat to preheat blancher water. These are maker-specific cooler statements, not a validated residence time for the drum’s blanching zone. [1]

The separately listed 6,000 lb/h three-stage cooler “cools most items” from 200°F (93.3°C) to 40°F (4.4°C) in 30 seconds; its 30,000 lb/h Ice Berg cooler has an approximately 4 × 4 × 8 ft footprint/height description. These are cooler throughput and cooling examples, not a drum batch-weight rating or guaranteed results for every food. The brochure’s Clean-Flow wedgewire-screen cleaning claim concerns a different machine design; specify the actual rotary drum’s access and cleaning procedure. [1]

03

Keep belt-blancher utility data separate from drum guarantees

Cabinplant’s BC is a belt blancher/cooler with steam-heated recirculating water and counterflow cooling. Its table labels the nominal-capacity product “Green Pears”; retain that wording and confirm the intended food with Cabinplant. These belt-model figures provide a separate equipment reference, not a rotary-drum steam guarantee. [4]

Cabinplant attributes a 50–60% steam reduction for its IBC to preheating, compared with blanchers without preheating. Its stated outlet example is about 12°C with about 1°C cooling water. Keep that comparator and water condition; it is not a saving established for the rotary drum in this page. [5]

Maximum steam flow and nominal food throughput are separate catalogue fields. Obtain coincident steam flow, food feed, inlet condition, residence time and heat-recovery arrangement for the offered drum; dividing those separate BC catalogue limits does not establish actual specific steam consumption. [4] [1]

04

Define the drum, heat supply and cooling interfaces

The rotary drum and its downstream cooler can be separate supplies. Identify the drum discharge, cooling-water loop, heat recovery and cleaning connections in the offered line. [1]

Specify food and cut geometry, bulk density, feed condition, target throughput, blanch endpoint and cooler outlet condition together. Require a drawing that identifies drum dimensions, inlet and outlet heights, heating mode and cleaning access for the offered model.

05

Resolve the sweet-corn study’s endpoints before using its test times

The Anand Agricultural University study tested 100 g sweet-corn samples: water blanching at 100°C with a sample-to-water mass ratio of 1:10 at 30, 60, 90, 120 and 150 s; steam blanching at 30, 60, 90, 120 and 180 s. Its peroxidase test used 1 ± 0.2 g of sample with 10 ml of 0.5% guaiacol and 10 ml of 0.08% hydrogen peroxide; a colourless-to-brick-red change after 3 min indicated incomplete inactivation. These are laboratory methods, not rotary-drum production settings. [3]

In Results, Peroxidase activity, the authors report more than 95% activity loss within 120 s in water, 90 s in steam and 60 s in microwave treatment, selecting those as optimum times. In the same discussion they cite a 90% indicator-enzyme reduction criterion; Table 1 gives fitted decimal-reduction times, defined for 90% reduction, of 145.73, 95.03 and 81.39 s for water, steam and microwave respectively. Retain the observed/selected times and the separate fitted D-values; ask the authors to reconcile them before using this paper to set an acceptance schedule. [3]

The abstract assigns the change from 8.40 to 6.30, 7.20 and 7.50 g/100 g total sugar to microwave, steam and hot-water treatments respectively. Results, Total sugar, instead assigns optimum-time values of 6.30 ± 0.23 to hot water, 7.20 ± 0.34 to steam and 7.50 ± 0.29 g/100 g to microwave, from 8.40 ± 0.67 g/100 g initially. Both source positions are reported; ask the authors to confirm the treatment assignment. [3]

Results, Total soluble solid, separately reports a change from 21.8 ± 1.23 to 13.7 ± 0.82°Brix for water at 120 s and to 18.3 ± 0.76°Brix for steam at 90 s. These measurements describe the tested corn and laboratory treatments. For a drum trial, name the enzyme assay, reduction endpoint, food geometry, core-temperature measurement and cooling endpoint in the acceptance procedure. [3]

06

Specify drum perforations, axial conveyance and steam containment

The Lyco patent describes the perforated drum, co-rotating auger, water reservoir, steam injection and sealed feed/discharge arrangement. A patent embodiment must be checked against the offered commercial machine. [2]

07

Record drum geometry without confusing cooler flow with drum loading

The brochure gives rotary-drum dimensions separately from particulate-cooler throughput. Specify product throughput and retained mass separately, and obtain the actual blanching-zone operating limits. [1]

08

Send the product, capacity and utility data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Products: [type; cut size; bulk density]
Capacity: [kg/h]
Blanch: [temperature; time; water or steam]
Cooling: [target °C; stages; water temperature]
Cleaning: [CIP]
Utilities: [steam pressure; water; power]
Layout: [inlet and outlet heights; space]

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