Miller Weldmaster PS400 Bag Closing Machine

What the PS400 does

The Miller Weldmaster PS400 is a bag closing machine that seals filled bags by hot air welding. It folds the open top and fuses it into a pinch or double-fold seal at up to 35 bags a minute, with a seal 25 to 64 mm wide and a heat source reaching 788°C. It is servo controlled, so it synchronises with the converting line, and a recipe system recalls the fold and seal settings for each bag type.

You will see this machine listed under a handful of names. Searches for a bag closing machine or an industrial bag sealing machine point to the PS400, as do woven sack closing machine, PP bag closing machine, bag top sealing machine and automatic bag closer. Whichever phrase you used, the PS400 is the machine behind it.

Built for high-throughput packing lines

The PS400 is for plants that fill and close bags in volume: cement and building-material baggers, fertiliser, seed and agro packers, food, grain, flour and sugar packers, and chemical and powder packaging lines. It is an inline machine, not a hand-held sealer, so it fits into a new or existing packaging line and keeps pace with the filler ahead of it. A precision folding system gives clean, straight folds, and a quick-change folding system lets you switch bag size and fold type without a long setup.

It runs from a three-phase supply at about 9 kW. Digital control means a quick production start-up, and the recipe management system makes changing between batches a matter of recalling a saved setting rather than redialling the line by hand.

Welded bag closing vs stitched and glued closing

A stitched bag top relies on thread and leaves a line of needle holes, and for fine products that is a real problem: cement, flour and fertiliser sift out through the holes, and broken needles or loose thread can contaminate food. Glue and hot-melt closing adds a consumable and a mess. The PS400 welds the bag shut with heat, so the seal is closed all the way across with no holes, no thread and no glue. The result is a cleaner, tamper-evident seal and a lower running cost.

• No sift-through: a welded seal has no needle holes, so fine powder stays in the bag.
• Food-safe: no thread or broken needles to contaminate the product.
• Lower running cost: no thread, needles, glue or hot melt to buy and reload.
• Inline speed: up to 35 bags a minute, servo-synced to the converting line.
• Quick changeover: recipe recall and a quick-change fold system between bag types.

Industries that use the PS400

Any plant that closes filled bags in volume is a fit. Miller Weldmaster builds the PS400 for packaging lines across:

• Cement and building materials: cement, plaster, tile adhesive and dry-mix bags.
• Fertiliser and agriculture: fertiliser, seed, feed and agro-input bags.
• Food and milling: grain, flour, rice, sugar and pet-food bags.
• Chemicals and minerals: powders, granules and mineral packing.
• Woven sack converters: PP and HDPE woven sack lines.
• Contract packing: third-party and co-packing operations.

Why source the PS400 through Magnum Resources

Magnum Resources is the authorised India partner for Miller Weldmaster, the US fabric and packaging welding specialist. A bag closer has to fit the fill line it sits on, so we work out the fold type, seal width and line speed with the factory before you commit. We bring it in, clear customs, fit it to your packaging line and train your team. Folding and heat-seal parts then come back to us rather than an overseas desk.

If you are sizing up a bag closing machine or an industrial bag sealer for a cement, fertiliser, food or chemical line in India, talk to our engineers about your bag type, fill rate and line layout. We will send back honest specs, a realistic lead time and a quotation matched to your line.