SD-4020 Jet internal circulation shrink machine

Detailed Photos

Parameter of SD-4020

Item	SD-4020
Transporting speed	0-15 m/min
Maximum weight	20 kg
Voltage	AC380V-4P
Total power	9 kW/h
Maximum height	150 mm
Size of machine	1600*560*660
Apply film	POF, PVC, PE
Maximum width	350 mm
Weight	180 kg

What the SD-4020 Does

The SD-4020 is a jet internal-circulation heat shrink packing machine — a shrink tunnel. It is the stage after the wrap: hot air circulates inside the tunnel and tightens the film around the roll or pack. It does not wrap; it shrinks. The SD-4020 is the economy version of this tunnel, built for plants where budget comes first and floor heat is acceptable.

Where It Fits on the Line

The SD-4020 sits after any wrapper that outputs a film-covered roll or pack:

Wrapper (SD-77HM / SD-920HM / SD-TB1020 / SD-1060 / SD-BL450) → SD-4020 shrink tunnel → labeling → case erecting and sealing → palletizing.

Any of those wrappers can pair with the SD-4020 or the SD-4522. Pick the tunnel by budget and floor temperature, not by wrapper brand.

Specifications

Item	SD-4020
Function	Heat shrink tunnel (internal hot-air circulation, not steam)
Film	POF, PVC, PE shrink film
Drive	Single frequency conversion
Stable running power	9 kW
Insulation	No insulation cotton
Floor temperature	Higher around the machine (operator feels the heat)
Position	Economy model, budget-first

Applications

The SD-4020 is not a standalone machine. It is the tunnel stage of a packing line, sold and commissioned together with the wrapper in front of it. That is how we supply it: you pick the wrapper for your product, and the tunnel comes sized to match.

What goes through it in real lines:

• Electrical tape rolls — single-roll packs from the SD-60SS or SD-77HM, multi-roll packs from the SD-TB1020

• Stationery and office tape in small poly bags

• Small boxes, books, and flat paper goods wrapped in POF or PVC film

The test is simple: if the wrapper can close film around the product, the SD-4020 can shrink it. Send us your largest pack size and we confirm the tunnel fits before you order.

SD-4020 or SD-4522

Both are the same machine type and name — a jet internal-circulation shrink tunnel. They differ in configuration and cost:

Item	SD-4020	SD-4522
Position	Economy	Energy-saving
Frequency conversion	Single	Dual
Stable power	9 kW	6 kW
Insulation cotton	No	Yes
Floor temperature	Higher	Lower
Tunnel size (W*H)	350*150mm	420*200mm
Price	Lower	Higher

Choose the SD-4020 when budget is the priority and the installer accepts a warmer floor. Choose the SD-4522 when you need the slightly larger tunnel, lower running power, and a cooler floor — and the budget allows it.

Before You Specify

CE certification and light-curtain guarding are standard for export lines.

Video-guided remote installation: set up the same day, 1–3 days commissioning, no costly on-site trip.

A Malaysian customer reported 20% more output, 30% lower labor cost, and 19% fewer defects after replacing hand packing (measured against their own manual baseline).

FAQ

Does the SD-4020 wrap the roll?

No. It only shrinks film that a wrapper has already applied. Pair it with a wrapper, not instead of one.

What film does it take?

POF, PVC, and PE shrink film all run. Film choice follows the product, not the tunnel.

Why would I pay more for the SD-4522?

Dual frequency conversion and insulation drop stable power from 9 kW to 6 kW and keep the floor cooler. Over shift hours that pays back where power is expensive.

My power supply is not 380V. Can you still supply?

Yes. We ship to different markets with different supply standards. Tell us your local voltage when you request a quote and we confirm the configuration before the machine leaves the factory.

How long to install?

Same-day setup, 1–3 days commissioning over video. Send your wrapper model and line speed for a matched tunnel size.