Bag Suction Cups for Packaging Machines

Bag suction cups for packaging machines must grip flexible film without excessive wrinkling, pull-through or continuous leakage. This collection brings together BOLTTE cup and fitting families for pouch opening, film pickup, soft-bag handling and replacement or retrofit work. Start with the bag material, usable seal area, cup diameter, vacuum response and existing mounting interface, then confirm the choice at production speed.

Quick series comparison

What to check before ordering

1. Bag construction: identify film type, thickness, surface coating, gusset, zipper and any printed or textured area.
2. Pickup location: test the actual seal point. Seams, folds, wrinkles and perforations can create continuous leakage.
3. Cup diameter: select a diameter that fits the available flat area without covering an edge or feature.
4. Vacuum and flow: thin film may need controlled vacuum, while leaky material may need more flow. Excess vacuum can deform the bag.
5. Motion: record cycle rate, acceleration, opening stroke and whether two cups pull opposite sides of the bag.
6. Mounting: confirm thread, port direction, fitting, overall height and any spring or level compensation.

Bag-opening troubleshooting

If the cup seals during a static test but fails at production speed, reduce acceleration, check the vacuum response time and move the pickup point away from seams or wrinkles. If only one side opens, compare cup height, alignment and hose restriction on both sides. For thin film that is pulled into the cup, test a smaller diameter, a supported lip profile or lower vacuum. For continuous leakage, prioritize flow capacity and a cup profile that follows the local surface.

FAQ

Which model should I start with?
Start from the bag material, flat pickup area, required cup diameter and existing mounting interface. STP assemblies are convenient when a complete unit is needed; VP, SGP, PAG, ZP3P, BGI and F-series options cover different cup and fitting requirements.

Can one cup handle every bag size?
No. The usable seal area, bag stiffness, leakage and machine motion change with the package. A short production test is recommended before a full order.

What information is needed for a recommendation?
Send bag photos or samples, film type and thickness, pickup position, cycle rate, vacuum source, current cup dimensions and the required thread or fitting.

Read the complete bag-opening cup selection guide, or request application help from BOLTTE.