A premade pouch machine — in Dutch, the packaging machine for preformed bags — pre-made bags. The bag is formed, glued, and printed offsite and delivered ready to use; the machine picks them up one by one, opens them, fills them, and seals them shut. No film roll, no forming shoulder, no seal adjustment per material—that is the fundamental difference from the VFFS.
The structure in six stages
- Warehouse. A storage bin containing 200 to 500 flat bags, stacked diagonally.
- Pocket handle. Suction arms pick up the top bag and place it on the conveyor.
- Open. Suction cups on both sides pull the bag open; a stream of air keeps the walls apart.
- Fill. The dosing device—screw, weigher, or piston—feeds the dose down through a filling tube.
- Pre-sealing. The bag is pre-sealed below the filling point so that nothing gets into the seam.
- Main Seal. The final seam closes the bag, which may contain a zipper, spout, or degassing valve.
Bag Types and Sizes
The machine processes anything that fits into a flat bag with an opening: the Doypack with a flat bottom, the block-bottom bag for heavier fillings, Quad Seal Bags for powder that needs to be stored, and bags of spout for liquids. Sizes range from 100 x 150 mm to 400 x 500 mm, with capacities from 50 g to 5 kg—the same limits as in the guide on Doypack Packaging.
| Bag Type | Characteristic | Typical content | Application |
|---|---|---|---|
| Doypack | floor-standing, display surface | 50 g to 2 kg | snacks, powder, coffee |
| Block-bottom bag | rectangular box bottom | 500 g to 5 kg | animal feed, pellets |
| Quad Seal | four vertical seams, stands upright | 250 g to 3 kg | powder, flour |
| Piping Bag | spout with screw cap | 100 ml to 2 l | liquids, sauces |
Speed and Limits
A premade line runs at a rate of 30 to 60 bags per minute. The speed is limited by the grip and the bag’s behavior: a thin, static-prone bag is harder to grip than a thick film bag. Above 80 bags per minute, the line becomes unprofitable compared to a vertical form, fill, and seal machine who makes the bag himself — the full analysis is in preformed bags or VFFS.
Where the route shines
The presentation: preformed bags feature sharper printing and more precisely glued curves than bags made from a roll. Operation: Without film adjustment, the operator remains a user rather than a setter. And the flexibility within a single bag family: switch formats by adjusting the grip width and program. Anyone packaging premium branded goods with manageable output chooses this route—the customers of LTC Pack That's how they do it in the coffee shop and supermarket industries.
Frequently Asked Questions
Q: Can the machine handle bags from different suppliers?
Yes, provided the bags fall within the specified tolerances for film thickness and opening. Have your bag suppliers follow the same drawing, and test each new batch for grip before the production day.
Q: What is the difference between this and a doypack machine?
None — "premade pouch machine," "doypack machine," and "preformed pouch filling machine" all refer to the same line of equipment. The name varies by supplier and region, but the operation does not.
Q: Can I add a VFFS later on?
Yes, and that's standard practice: the premade line for premium small formats, and the VFFS for high-volume production. The dosing units can sometimes be divided into modules—plan that integration before placing the second order, because frames and control systems vary by manufacturer.
Related pages
packaging machine for preformed bags | Doypack | block-bottom bag | preformed bags or VFFS | vertical form, fill, and seal machine
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