Twin-Nozzle Hot Air Heat Shrink Machine for Large Diameter Tube WM-668F
The WM-668F shrinks large-diameter tube with two opposed hot-air nozzles — 2 × 2 kW heating elements blow at the workpiece from both sides at once, so thick cable ends and joints shrink evenly without being turned. Nozzle spacing adjusts freely, with Ø50 mm and Ø25 mm round outlets and 198 m³/h rated airflow per 50 W blower. A digital controller holds temperature to ±2 °C with hot air up to 350 °C under a 395 °C safe-use ceiling, and heating wire life is rated 100,000 hours. Total power is 4,100 W on 220 V, machine weight 15 kg.
Specifications
| Function | Hot-air shrinking of large-diameter heat shrink tube, twin opposed nozzles |
|---|---|
| Hot air outlets | 2, pair blowing — nozzle distance freely adjustable |
| Air outlet size | Ø50 mm and Ø25 mm round outlets (optional) |
| Heater | Heating wire, 2 × 2 kW, power adjustable |
| Temperature regulation | Intelligent regulation, digital temperature display |
| Temperature control accuracy | ± 2 °C |
| Hot air temperature | Up to 350 °C |
| Safe use temperature | < 395 °C |
| Heating wire life | 100,000 hours (listed rating; actual life depends on operating conditions) |
| Blower | 50 W — air volume 198 m³/h rated, about 98 m³/h actual, static pressure 198 Pa |
| Insulation | Double insulation cotton |
| Machine power | 4,100 W |
| Power supply | 220 V, grounded |
| Machine weight | 15 kg |
| HS Code | 8419.89 (common reference — final classification confirmed by your customs broker) |
| Certification | CE (certificate provided with shipment) |
Key features
- Two nozzles blow toward each other, so heat reaches both sides of a thick cable end in one hold — reducing the need to rotate the part; verify uniform recovery on the actual geometry
- Nozzle spacing and angle adjust to the workpiece, from Ø25 mm outlets for cable ends up to Ø50 mm for wide joints and end caps
- Element power and air temperature are set digitally to ±2 °C, so thick-wall tube gets sustained even heat instead of an operator-judged flame
- The station rolls on casters and needs only a 220 V socket, so it moves to heavy cable work instead of heavy cable coming to it
What it processes
- Shrinking thick-wall tube and end caps on large power, earth and battery cable
- Insulating lugs, splices and busbar connections where heat must surround the joint
- Rework and repair of heavy harness sections beside the line or in the service bay
Suited for: large-diameter and thick-wall shrink work — end caps and insulation on heavy power, earth and battery cable, lugs and splices that need heat from both sides at once. Not suited for: continuous small-part production — for that, pick the WM-666 crawler belt tunnel oven, which shrinks sleeves on wires at 2,000 pieces per hour on a through-feed belt — nor cutting or positioning the tube itself.
Heavy cable and thick-wall tube behave differently brand to brand, so we prove yours first: send sample cable ends with the exact tube you use, and we shrink them at this station on video and mail the finished samples back before you order.
Engineering knowledge
Choose and troubleshoot this process
- Heat Shrink Defects: Causes and Corrective ActionsTroubleshoot incomplete recovery, wrinkles, splits, scorching, sleeve movement, trapped air, uneven adhesive flow and heat damage.
- How to Choose Heat Shrink Processing EquipmentChoose heat shrink equipment by sleeve material, recovered dimensions, adhesive requirement, harness geometry, heating method, takt time and validation plan.
WM-668F — common questions
Why two opposed nozzles instead of one gun?
Large-bore tube fails by uneven shrinking — the side facing a single gun tightens first and the back stays loose. With pair blowing, hot air hits both sides simultaneously and the tube draws down concentrically in one hold. Nozzle distance adjusts to the cable diameter, so small and large joints both sit in the overlap zone.
Is there enough heat for thick-wall and large-diameter tube?
The two elements total 4 kW with air up to 350 °C, and output is power-adjustable under a ±2 °C digital controller — sustained, regulated heat rather than a short blast. Validate complete recovery and jacket condition on your actual tube and cable. The listed 100,000-hour element rating is not a guaranteed service life; actual life depends on operating conditions.
What is the WM-668F not the right tool for?
High-volume flows of small parts — a conveyor machine in the heat shrink processing category moves pieces past the heat automatically and beats hand-held cycle times. It also does not cut or position tube; pieces are placed by the operator before shrinking.
Related machines in Heat Shrink & Tube Insertion
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Crawler Belt Heat Shrink Tunnel Oven for Continuous Wire Sleeve Shrinking
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