Mercure / Secap 720 Envelope Sealer
The Mercure / Secap 720 is a Swiss-built conveyor-fed envelope sealer that seals all common formats from #10 to C4 Pocket at up to 300 per minute, with hands-free infrared start/stop.
Description
About the Mercure / Secap 720
The Mercure / Secap 720 may well be the last envelope sealer you ever need to buy. This fast, Swiss-built sealing machine seals all common envelope formats — from #10 up to C4 Pocket — at up to 300 per minute, with a simple setup and no manual opening of flaps or pressing of letter piles. It is the result of decades of development and production experience in mail-processing machines.
Its deep design (460 mm) suits all common formats including C5, C6/5, C4 and B4 plus C4 Pocket (324 x 229 mm), ideal with the flap on the short side. An integrated photoelectric infrared switching system provides automatic start/stop during processing, so your hands stay free to add letters and clear the receiving tray — with no empty cycles and no extra wear. A standard version handles common envelopes with flap on the length side and a short receiving tray, with options for a long tray for C4/B4 formats. Use Supplies For Mailers sealing fluid concentrate to activate the glue quickly and reduce mold buildup.
Still Supported by All For Mailers
All For Mailers continues to support the Mercure / Secap 720 with sealing fluid, separating rubber, conveyor belts and parts. New sealers in this series have been available — contact us for current price and availability.
Protect what you have. These machines were built to last, and the mechanics will outlive the electronics every time. If you’re running one, put it on a quality surge protector, and add static protection — especially in dry winter air or on high-speed paper handling. Power spikes and static are what kill boards, and on these machines a board may not be replaceable at any price. It’s the cheapest insurance there is for equipment you can’t simply reorder.
Need supplies or parts? Visit SuppliesForMailers.com.
Mercure Secap 720 Specifications
| Model | Mercure / Secap 720 Envelope Sealer |
|---|---|
| Machine type | High-speed automatic envelope sealer |
| Speed | Up to 300 envelopes per minute |
| Envelope formats | #10, C6/5, C5, C4, B4, and C4 Pocket (324 × 229 mm) — including square-flap envelopes |
| Design depth | 460 mm — deep enough for flap-on-short-side C4 Pocket work |
| Receiving tray | Standard short tray (278 mm); optional long tray for C4/B4 (380 mm, Option G); DES version available |
| Automation | Integrated photoelectric infrared start/stop — runs only when envelopes are feeding, eliminating empty cycles and wear |
| SATURN model | Piling option (Option O) for both stacked and nested envelopes |
| Flap handling | No manual opening of flaps and no handling or pressing of letter piles |
| Build | Swiss-manufactured |
| Recommended supply | Supplies For Mailers sealing fluid concentrate — activates the glue quickly and reduces mold buildup |
Every row above comes from this product’s own published page copy — the seven original bullet specs, reformatted into the site spec table with no value changed, plus flap handling and recommended supply from the description. No manufacturer spec sheet for the 720 is on file, so envelope thickness range, dimensions, weight and power are omitted rather than estimated — call 866-430-2874 for those.
Common Secap 720 / Mercure Problems & First Checks
Envelopes not sealing fully: Check moistening fluid level, clean moistening components, and use a sealing fluid concentrate rather than plain water — it activates envelope glue faster and reduces mold buildup.
Misfeeds or double feeds: Inspect the separating rubber — the most common wear item, inexpensive to replace.
Envelopes stalling in transport: Check the conveyor belt for wear, glaze, or adhesive buildup.
Machine will not start automatically: Clean the photoelectric infrared sensor — paper dust is the usual culprit.
Still stuck? Call 866-430-2874 — phone, remote, and nationwide on-site support.
Secap 720 / Mercure Parts & Supplies
- Separating rubber
- Conveyor belt
- Knurled-head nut (separating-rubber holdfast)
- Sealing fluid concentrate — available at SuppliesForMailers.com
Looking for an Envelope Sealer Today?
Refurbished Secap 720 availability comes and goes — contact us for current stock. If you need a machine now, we recommend its modern successor: the RENA ES-450 Envelope Sealer — Desktop Flap Sealer, 300 ft/min, brand new at $3,000 with full factory warranty and our nationwide support behind it. Same job, new machine, ready to ship. Call 866-430-2874 and we’ll help you choose.
Additional information
| Speed (pieces/hr) | Up to 300 envelopes per minute |
|---|
Frequently Asked Questions
Is the Mercure / Secap 720 still available new?
New sealers in this series have been offered — contact us for current price and availability, or ask about comparable current envelope sealers.
How fast is the 720 and what envelope formats does it seal?
Up to 300 per minute, sealing all common formats from #10 up to C4 Pocket (324 × 229 mm), including square-flap and nested envelopes on piling-option models.
How does the 720 compare to the AFM300S?
They are the same class of high-speed Swiss sealer at up to 300 envelopes per minute with the same 460 mm depth and C6/5-to-C4 Pocket format range. The AFM300S is the version All For Mailers supplies today, with the SE photoelectric start/stop and SATURN piling options.
Can I still get parts and supplies?
Yes — visit SuppliesForMailers.com or call 866-430-2874.
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