Robots for plastics molders and converters

Injection molders are the easiest machine in manufacturing to tend with a robot, which is why so many of them already are. The second robot in a molding plant is usually inspection or kitting, and that is where the mistakes get made.

Free, about two minutes, no phone number. You get an honest no when a robot is the wrong answer.

Who this is for

You run injection molding presses or converting lines, three shifts, with people unloading, trimming, packing and checking parts. Volumes are high, part geometry repeats, and quality escapes are expensive.

What automates first here

• Machine tending: press unloading beyond the top-entry robot: degating, trimming and packing in one cell
• Pick and place: parts from a conveyor or a bin into trays and cases
• Kitting parts into trays: assembly-ready kits from molded components
• Presence and absence checking: the cheapest inspection that pays
• Surface defect detection: only when two of your own inspectors agree on what a defect is
• Line-side delivery by mobile robot: an AMR loop instead of forklift laps between presses and the warehouse

Machines that usually make the shortlist

Press tending runs on collaborative and small industrial arms, often on the press guarding itself; pick and place on delta robots and SCARA arms at rate; inspection on an arm presenting parts to a camera. Our matrix carries pick-and-place-capable machines from more than forty makers and inspection-capable arms from more than thirty. The casebook has three molders doing exactly this, one of them a 33 person shop checking 200 holes in 3.5 seconds.

Every machine named on this site is in the published matrix with figures checked against the maker's material and no prices, because a price before an engineer has seen the job is a guess.

What has to be true before anyone quotes

• Part release and orientation out of the press, which decides the gripper.
• Cycle time and the number of cavities, which decide whether one robot keeps up.
• What a defect looks like, in writing, agreed by two inspectors, before anyone quotes vision.
• Tray and case design, because a kitting cell is only as good as the tray.
• Floor traffic and charging for any mobile robot loop.

When a robot is the wrong answer here

• Inspection where nobody can define the defect.
• Family molds that change daily with no fixed part presentation.
• A press with no signal interface and no budget to add one.
• Mobile robots on a floor where forklifts own every aisle.

Someone has already done this

Common questions

Can vision inspect my parts?

If two of your inspectors can agree on what a defect looks like and describe it, yes, and the casebook shows molders doing it at production rate. If they cannot agree, a camera will not settle the argument, and we say so.

Is a cobot fast enough for pick and place?

For most tray and case work, yes. Above roughly one pick a second, delta robots and SCARA arms take over, and the matrix holds both classes with rates checked against the datasheet.

Do mobile robots work in a molding plant?

One casebook entry is an injection molder that replaced forklift laps with an AMR loop. The questions are floor traffic, doorways, and who charges and maintains the fleet.