Bottles are deceptively hard to automate. They are round, often wet, sometimes shrink wrapped, and they change behavior completely between empty and full. A gripper that handles empty PET flawlessly can crush it, and one sized for full glass may fumble the empty version of the same bottle. Here is how to pick tooling that survives real bottling lines.
Quick answer: Grip bottles mechanically at the neck with an External Bottle Gripper when they are wet, cold, full, or unstable, and grip them by the cap or as packs with vacuum tools when tops are flat and sealed. Specify for both empty and full states, count bottles per pick, and flag shrink wrap early because pocket geometry accounts for it.
Empty vs Full Changes Everything
Empty bottles are light but fragile: grip force must be controlled or thin walls deform, and static electricity makes empty PET cling in ways that surprise every first-time automation project. Full bottles are heavy, up to several hundred grams each in multi-bottle picks, and their liquid mass shifts during motion, which punishes weak grips and sharp trajectories. Specify your tooling for both states if your line touches both, and tell your supplier which state dominates, because the answer changes the recommended tool.
Mechanical Gripping for Necks and Caps
Our External Bottle Gripper (EBG) range grips bottles externally at the neck, a positive mechanical hold that does not care whether the bottle is wet, cold, or full. The cam activated design in our high speed bottling case study picks entire rows of bottles per cycle at line speeds, with every pocket printed to the exact neck geometry of the bottle it handles. Shrink wrap around the cap and neck matters here, so flag it early: the pocket geometry accounts for it. Because the pockets are SLS printed, a new bottle format means a new printed row plate rather than a machined rebuild, the same iteration advantage we cover in our nylon vs aluminum comparison.
Vacuum Gripping for Rows and Packs
Capped bottles with flat tops, bottle packs, and shrink wrapped trays suit vacuum handling. A multi-point tool like the Spider Gripper (SPI) places a suction cup on each bottle cap with pitch matched to your pick pattern, and two independently controlled vacuum zones allow picking two groups or releasing them separately during placement. For shrink wrapped multipacks handled as one unit, a surface tool such as the Area Surface Gripper (ASG) with foam sealing rides over the film wrinkles that would defeat individual cups; the interface logic is the same one laid out in our foam vs cups guide.
Pick Pattern Decides the Tool Format
Single bottle handling, row picking from a filler discharge, and full layer transfers are three different tools. Count the bottles per pick, measure the pitch at pick and at place, and note whether the pattern changes between them. Variable pitch between pick and place is a solved problem, but only when the tool is designed for it from the start; our variable pitch spreader case study shows a tool that picks tight and places wide in one cycle.
Line Speed, Wet Floors, and the Rest of Reality
Bottling halls are wet, cold, and fast. Printed nylon tooling shrugs off condensation and washdown chemistry with no corrosion and no fastener crevices, and its low weight keeps cycle times up on the row picks where every extra kilogram at the wrist slows the corner. If the same robot also cases or palletizes the packed bottles, plan the tool change strategy at the same time using our tool changer guide. The wider application picture lives on our bottle handling page, and every EBG and gripper configuration is in the online catalogue.
Glass vs PET: Two Different Problems
Glass and PET fail in opposite directions. Glass is dimensionally stable and heavy: the grip does not deform it, but the mass punishes weak holds and the consequences of a drop are shattered product and a stopped line while someone clears it. PET is light and compliant: full bottles behave, empty ones deform under enthusiastic grip force and cling to each other with static. Neck gripping sidesteps most of both problems, since the neck finish is the most dimensionally controlled feature on any bottle, molded to tight tolerance for the cap. That is exactly why the External Bottle Gripper (EBG) pockets grip there, and why the same strategy carries from returnable glass to lightweight PET without redesign.
From Filler to Pallet: Where Each Tool Lives
Follow a bottle down the line and the tooling map draws itself. At filler discharge, bottles arrive in rows at fixed pitch: row picking with neck grippers or cap vacuum, often with variable pitch to the next machine\’s spacing. After packing, the unit becomes a multipack or tray: surface vacuum with foam over the film. At end of line, the unit is a case like any other, which returns you to our palletizing gripper guide. Plants that map tooling to these stages, rather than forcing one tool across them, run faster at every stage and change formats without drama. The complete flow is laid out on our bottle handling page.
Frequently Asked Questions
How do robots pick up bottles?
Two main strategies: mechanical neck gripping, where printed pockets hold each bottle below the cap, and vacuum gripping on flat caps or across shrink wrapped packs. The right choice depends on bottle state, surface, and pick pattern.
What gripper works best for full bottles of liquid?
Mechanical neck gripping with an External Bottle Gripper handles full bottles reliably because the hold is positive and unaffected by wet, cold, or shifting liquid mass. Cap vacuum works for full bottles with flat sealed caps at moderate speeds.
Can a vacuum gripper pick bottles by the cap?
Yes. A multi-point tool like the Spider Gripper places a suction cup on each cap with pitch matched to the pick pattern, and two vacuum zones allow picking or releasing two groups separately.
How does shrink wrap affect bottle gripping?
Shrink wrap around the cap and neck changes the geometry the gripper pocket must close around, so it must be flagged at design time. For wrapped multipacks handled as one unit, foam sealing vacuum tools ride over film wrinkles that defeat individual cups.
Get the Right Tool for Your Line
Every Anubis Robotic Tooling product is engineered around your product, your robot, and your cycle time. Tell us about your application and our engineering team will come back with the right tooling and a clear quote. Request a Quote, browse the full range in our online catalogue, or contact our Eindhoven team directly.
