Battery Sorting, Honeycomb Tray Forming and Case Packing Line

Three product families and six SKUs: 550 ppm battery infeed through honeycomb tray insertion, telescopic box forming, cartoning and a combined case opening and packing unit.

  • Client Duracell
  • Battery and Consumer Electronics
  • Region United States

Client Background

Duracell produces batteries in three distinct product families, and the consumer pack for each is different. Some packs hold a small number of large cells, others a larger number of small ones, and the pack itself is a two-piece telescopic box with a separate lid and base rather than a folding carton. Retail and transport requirements add a step that does not exist in most cartoning applications: the cells have to be separated from each other inside the pack. A honeycomb separator is formed and inserted so that batteries cannot touch terminal to terminal in the pack. The line therefore runs from a 550 ppm battery infeed through honeycomb insertion, telescopic box forming, cartoning and finally a combined case opening and packing unit — five functional steps fed from one flow.
Case Video

Challenges

Three product families that share almost no geometry

The three battery categories differ in cell diameter, cell length and count per pack. Integrating them into one line was the central engineering difficulty of the project, and it drove the recipe structure rather than a mechanical compromise between them.

Honeycomb separator forming and insertion

The honeycomb tray has to be formed, filled with cells and presented to the cartoner without any cell escaping its pocket. A separator that is inserted out of position defeats its purpose, so insertion is a controlled step rather than a push.

Telescopic box forming with a separate lid and base

A two-piece box needs two blank feeds that must be registered to each other before the lid is placed. Misregistration between lid and base is immediately visible to the consumer, so alignment is monitored in line.

One 550 ppm flow feeding four downstream steps

Sorting, tray forming, box forming and case packing all draw from the same battery flow. Any imbalance between them starves the line, so buffers and interlocks are sized to that infeed rate rather than to average demand.

How ZRAY Solves It

This is a five-module line, and the design principle throughout is that the differences between the three families are held in recipes, not in hardware. **Battery orienting and sorting module.** Cells are oriented and sorted from the 550 ppm infeed so that each downstream module receives a stream of the right cell. **Honeycomb separator forming and insertion module.** The separator is formed in line and the cells are placed into the honeycomb pattern. Insertion is servo-controlled so the tray is presented square to the cartoner with every pocket filled. **Telescopic box forming machine.** Lid and base are formed from separate blanks and registered to each other. Both are formed on the same machine, which is what keeps the lid-to-base fit consistent across the six SKUs. **Box cartoning machine.** The filled honeycomb tray and the formed box are brought together, loaded in the correct orientation and closed. **Combined case opening and packing unit.** The shipper case is opened and the closed boxes are packed in one unit, so the line ends with a case ready to ship. **Recipe structure for three families.** Cell geometry, count per pack, honeycomb pattern, box size and case fill are all recipe parameters. Format changeover is 30 minutes, and it is the geometry differences — not the changeover mechanism — that set that time.
Battery orienting and sorting module Orients and sorts cells from the 550 ppm infeed.
Honeycomb separator forming and insertion module Forms the separator in line and fills every pocket before cartoning.
Telescopic box forming machine Separate lid and base blanks formed and registered to each other.
Box cartoning machine Brings honeycomb tray and formed box together, loads and closes.
Combined case opening and packing unit Opens the shipper and packs the closed boxes in one unit.
Recipe set for 6 SKUs across 3 families Cell geometry, honeycomb pattern, box size and case fill; 30 min changeover.

Project Results

550 ppm
Battery infeed speed
6 SKUs
Across three product families
30 min
Format changeover time
5 modules
Sorting to case packing on one line

Project Timeline

  1. 01

    Family and pack study

    The three battery families, the honeycomb requirement and the telescopic box construction reviewed together before the line concept was fixed.

  2. 02

    Module design and build

    Five modules engineered as one line, with the recipe structure defined for all six SKUs.

  3. 03

    Factory run and FAT

    Full line run on representative cells at the ZRAY plant, including honeycomb insertion and changeover.

  4. 04

    Shipment, installation and commissioning

    Line shipped, installed and commissioned on site; operators trained on the six recipes.

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