Palletizing is the last job on a line and the one most often still done by hand. Cases, sacks or trays come off a conveyor and have to be stacked in a pattern on a pallet, layer after layer, until the pallet is built. It is heavy, it is repetitive, and it is the single task most likely to be the reason a line needs two people rather than one.
What decides the price
Four numbers set the cost of a palletizing cell before anyone talks about brands. The weight of one case with the gripper that holds it sets the payload. The height of a full pallet plus the pallet itself sets the reach. Cases per minute sets whether one pick at a time is enough or the cell has to build a whole layer and place it in one move. And the number of different patterns decides how much of the work is software rather than steel.
Where a collaborative arm wins
A cobot palletizer is attractive for the same reason it is attractive anywhere: it can often sit in the floor space the pallet already occupies without a fence around it, and it can be moved to another line when the product changes. It suits lower case weights and moderate rates. Push the case rate up and the speed limits that make an arm safe to work beside become the constraint, which is the point at which a conventional cell behind guarding is the cheaper machine per case.
The gripper is the application
Vacuum suits smooth, sealed cartons and does badly with porous board, shrink wrap and open trays. Fork or clamp tooling handles sacks and unstable loads that suction will drop. Bag palletizing is its own discipline because the load changes shape in transit. Two shops quoting the same pallet pattern can come back a long way apart purely because one specified a simpler end effector than the job actually needs, so describe the worst case rather than the typical one.
What has to be there before the robot arrives
A palletizing cell needs a reliable supply of cases in a known orientation, somewhere to stage empty pallets, and somewhere for full ones to go. Infeed that jams, cases arriving at random angles, or a pallet change that stops the line are what turn a fast cell into a slow one. Pallet handling is often left out of the first quote and is worth pricing explicitly, because a person feeding pallets by hand to a robot is only half an automated line.
Patterns, stability and what leaves the building
The pattern is not only a stacking puzzle. Interlocked layers hold together better in transit but do not suit every case size, slip sheets add stability and cost, and a load that arrives collapsed is a customer problem rather than a production one. Agree the pattern against how the pallet actually travels, and have the cell prove it on real cases before it is signed off.
Questions people ask about robotic palletizer
What is a robotic palletizer?
It is a robot arm with tooling that stacks cases, sacks or trays onto a pallet in a set pattern, taking them from a conveyor and building the load layer by layer.
Is a cobot palletizer slower than a conventional one?
Generally yes at the top of the range, because the speeds that let an arm work near people are lower than a fenced cell can run. For moderate case rates the difference often does not matter; for high rates it decides the answer.
Can one cell serve two lines?
It can, if the lines are close enough for one reach envelope and their combined rate fits inside the cell's capacity. It is a common way to justify a cell that a single line could not carry on its own.
What information should I send when asking for a quote?
Case dimensions and weight, cases per minute, pallet size and target height, the number of patterns, the case material, and a photograph of the end of the line as it stands today.
Does a palletizing cell need guarding?
A conventional one does. A collaborative one may not, but that comes out of an assessment of the whole application including the load being carried, not from the choice of arm alone.