For machined parts, design cardboard dividers around the surfaces that must be preserved, not just the occupied volume. A component can remain functional yet be rejected for a scratch, coating mark or defect on a sealing surface. Identify acceptable contacts and prohibited defects before choosing board and cell dimensions.
Classify surfaces by their function
Use the component drawing to distinguish appearance-critical areas, functional surfaces and permitted supports. Apply a simple marking system understood by the packaging designer and packing team. A general description such as fragile part leaves too much open to interpretation. Show precisely what the divider may touch and which features must remain clear.
State the part’s actual condition at dispatch: machined, painted, coated, oiled or individually protected. These conditions can affect its interaction with board. If separate corrosion protection is specified, identify it in the bill of materials. Do not implicitly assign the divider a corrosion-protection function that has not been defined or supported by appropriate evidence.
Identify sharp edges and projections
A component may include an edge, tooth, screw or connector that concentrates contact in a small area. Show these projections within the packaging envelope. Review their proximity to divider walls, the box and neighbouring parts. A satisfactory overall width does not resolve a local projection capable of deforming or damaging a strip.
Imagine two hypothetical cylindrical parts with the same main diameter, one of which has a projecting bracket. Identical cells could produce different behaviour. Review bracket orientation, rotational freedom and any need for an additional support. Increasing the whole cell size does not guarantee that the bracket will remain away from adjacent products throughout the intended journey.
Define a repeatable orientation
The loading orientation should preserve approved contacts. If a part can be rotated or reversed during packing, either examine the possible positions or provide suitable identification and location features. A workstation photograph may be enough for simple geometry; a more specific protective arrangement may be needed where an error has significant consequences.
Estic-Maillot cardboard partitions include applications involving mechanical parts and automotive components. This general capability does not replace the study of your specific part. Ask the drawing to distinguish separation walls from components that actually support the product or retain its orientation.
Examine contact throughout the operation
Contact can occur during insertion and removal as well as transport. Observe the part passing through the cell with any individual protection and gripping equipment present. If handling requires pushing or levering against a sensitive surface, review the geometry or operation. A design should not rely on an exceptional technique known only to the person who prepared the prototype.
After packing, examine marks on both the part and the divider. A board mark helps locate contact but does not automatically establish whether it is acceptable. Compare it with product criteria. For functional surfaces, agree the relevant inspection with the quality team rather than relying entirely on a quick visual examination.
Specify cleanliness requirements
Some components must avoid particles or residues on defined areas. State the requirement and the evaluation method. Do not assume that one board type is suitable for every cleanliness level. Material, converting, storage and handling can all affect the result observed at the component surface.
If parts are supplied oiled, examine their interaction with the pack and the implications for handling used components. An individual barrier may alter fit and contact, so include it in trials. The divider supplier needs to know this configuration. A clean, dry demonstration sample cannot establish behaviour in a different shipping condition.
Make appearance inspection consistent
Prepare reference photographs and define useful observation conditions: surfaces examined, lighting and any required measuring equipment. Identify parts before testing so that existing defects can be distinguished from damage arising during the trial. Words such as scratched or marked should correspond to shared criteria, especially when several receiving sites assess the same product.
Retain examples accepted after testing where practical. They can help explain decisions when a supplier or packing method changes. Link observations to a component version, divider material, outer case and distribution programme. Without that traceability, a successful result is difficult to transfer reliably to subsequent production.
Review variants before sharing one divider
A painted part and an unfinished part may have identical geometry but different contact requirements. Similarly, an optional fastener can create a new projection. Maintain a list of approved product states and variants rather than assuming that matching outside dimensions makes them interchangeable. This also helps the packing team recognise when a familiar part needs a different protective component.
If the same divider is proposed for several references, trial the combinations most likely to create tight contact, loose movement or difficult loading. Document any restrictions. A shared packaging reference can simplify supply, but only when the range it covers is explicit and supported by the relevant checks.
Prepare the design information
- Component drawing showing sensitive surfaces and permitted supports.
- Actual shipping condition and individual protection.
- Edges, projections and possible orientations.
- Unit mass and quantity per case.
- Cleanliness requirements and receiving criteria.
- Distribution route and handling equipment.
Where extra supports are needed, honeycomb paperboard protection can be studied alongside the divider. Give every component a defined role. To prepare that review, send a representative part and its contact map rather than only its overall dimensions.
Frequently asked questions
Is a divider sufficient for a heavy machined part?
Mass alone cannot establish that. Review supports, projections, the box and distribution conditions. The divider may provide separation while another component carries the relevant forces.
Can painted and unfinished versions share a cell?
Possibly, but matching geometry does not prove matching contact requirements. Evaluate both conditions and identify the approved versions in the packing specification.