Star Plast Engineering

Why does a functional part still get rejected by the customer?

Because visual defects do not care that the part is functional. In plastic injection, a component can clip, seal, position, and assemble correctly, but still be rejected because 𝘁𝗵𝗲 𝘀𝘂𝗿𝗳𝗮𝗰𝗲 𝗱𝗼𝗲𝘀 𝗻𝗼𝘁 𝗹𝗼𝗼𝗸 𝘀𝘁𝗮𝗯𝗹𝗲. From flow marks and stripes to contamination or transparency variation, these can create a claim even when the technical function is not affected. For visible parts, the customer often reads the surface before they read the dimensions.

The difficult part is that aesthetic defects are rarely isolated cosmetic accidents. They usually come from 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗽𝗵𝘆𝘀𝗶𝗰𝘀. Flow front instability, mould temperature imbalance, gate position, venting, drying conditions, masterbatch dispersion, fibre orientation, holding pressure, cooling rate, polishing condition, and handling after demoulding can all change the surface. A small black dot may be contamination. A gloss variation may be mould temperature or flow speed. A sink mark may be due to wall thickness, packing pressure, or rib design. A scratch may not come from the mould at all, but from manual handling, packing or secondary operations.

At , aesthetic control is linked with process control, metrology, and production handling. The point is not only to sort good-looking parts from bad-looking parts. The point is to understand 𝘄𝗵𝗲𝗿𝗲 𝘁𝗵𝗲 𝗱𝗲𝗳𝗲𝗰𝘁 𝗶𝘀 𝗯𝗼𝗿𝗻. Is it material-related, mould-related, process-related or handling-related? This distinction matters because the wrong root cause creates the wrong corrective action.

For purchasing, this is where many commercial discussions become subjective. One side says the part is functional. The other side says the part is not acceptable. If the visual criteria are not aligned early, aesthetic quality becomes a grey-zone conflict. Star Plast Engineering’s value is in treating 𝘃𝗶𝘀𝘂𝗮𝗹 𝗾𝘂𝗮𝗹𝗶𝘁𝘆 𝗮𝘀 𝗮 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗱𝗶𝘀𝗰𝗶𝗽𝗹𝗶𝗻𝗲, not as an opinion. Because if the customer can see the defect, purchasing will eventually see the cost.

Why does a part pass dimensions but fail during assembly?

A plastic part can be fully within the dimensional report and still fail the moment it enters the real assembly environment. This usually happens because 𝗴𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝗮𝗻𝗱 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻 𝗮𝗿𝗲 𝗻𝗼𝘁 𝘁𝗵𝗲 𝘀𝗮𝗺𝗲 𝘁𝗵𝗶𝗻𝗴. A clip can be within tolerance and still lose retention because the snap-fit does not recover correctly after engagement. A sealing lip can measure correctly and still leak because compression, mating surface, material hardness, and deformation direction were never tested together. A housing can pass CMM and still create stress in assembly because the real datum is not the same datum used in the measuring program.

This is one of the most common gaps between 𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗮𝗽𝗽𝗿𝗼𝘃𝗮𝗹 𝗮𝗻𝗱 𝘀𝗲𝗿𝗶𝗮𝗹 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗿𝗲𝗮𝗹𝗶𝘁𝘆. On paper, the part is good. In the line, the operator feels resistance, the fixture does not close cleanly, the clip makes a weak sound, the cable does not sit properly or the mating component needs force to be assembled.

At , functional testing is not treated as an extra check after moulding. It is part of the way the part is read. The team looks at: insertion force, pull-off force, clip retention, sealing behaviour, torque points, cable routing, mating parts, assembly sequence, fixture positioning and deformation after demoulding. The question is not only whether the plastic component respects the drawing. The question is whether it survives the 𝗿𝗲𝗮𝗹 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝗶𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 around it.

For purchasing, this is an uncomfortable but important point. A supplier can send an approved dimensional report and still not understand how the part behaves in the customer’s assembly. That gap becomes rework. Functional testing reduces that risk because it connects the part to the operation that follows after moulding. 𝗔 𝗰𝗼𝗿𝗿𝗲𝗰𝘁 𝗽𝗮𝗿𝘁 𝗶𝘀 𝗻𝗼𝘁 𝗮𝗹𝘄𝗮𝘆𝘀 𝗮 𝘂𝘀𝗮𝗯𝗹𝗲 𝗽𝗮𝗿𝘁. A usable part is the one that performs correctly inside the final product, under real assembly conditions.

APQP is often reduced to a set of documents, but in a serious industrial project, it is the 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗻𝗴 𝘀𝘆𝘀𝘁𝗲𝗺 that connects risk to responsibility and evidence before serial production starts. Without APQP discipline, every department can be doing its own job, and the project can still be exposed. Engineering may review the drawing, quality may prepare documents, production may wait for trials, and purchasing may negotiate price and timing.

But if the risks are not connected into one controlled project logic, the launch will depend too much on assumptions.

In plastic injection, assumptions are expensive because the real cost usually appears after tooling, validation or nomination.

The real value of APQP is that it forces the project team to make hidden risks visible early. Special characteristics, feasibility assumptions, DFMEA inputs, PFMEA logic, process flow, control plan, MSA, capability studies, Run@Rate, packaging validation, PPAP evidence, and change control should not be treated as disconnected files. They are supposed to describe the 𝘀𝗮𝗺𝗲 𝗶𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗮𝗹 𝗿𝗲𝗮𝗹𝗶𝘁𝘆 from different angles.

If the PFMEA identifies a process risk but the control plan does not control it, the system is weak. If a critical dimension exists but the MSA is not suitable, the data is weak. If the process capability is required but the process window is not stable, the approval is fragile.

For purchasing, APQP maturity is one of the clearest signs of supplier maturity because it shows how the supplier manages uncertainty before it becomes costly. A supplier with weak APQP may still give a competitive price and a confident answer during RFQ.

A supplier with strong APQP creates alignment between engineering, metrology, tooling, production, quality and supply chain. They know what needs to be proven, when it needs to be proven and which evidence is strong enough to support the launch. At , APQP is not about creating paperwork for the customer. It is about building a 𝗱𝗶𝘀𝗰𝗶𝗽𝗹𝗶𝗻𝗲𝗱 𝗽𝗮𝘁𝗵 𝗳𝗿𝗼𝗺 𝗥𝗙𝗤 𝘁𝗼 𝗦𝗢𝗣.

In plastic injection, the mould is often treated by purchasing as a one-time investment: quoted, ordered, launched, approved and then expected to perform.

But a mould is a 𝗺𝗲𝗰𝗵𝗮𝗻𝗶𝗰𝗮𝗹 𝘀𝘆𝘀𝘁𝗲𝗺 exposed to pressure, temperature, friction, material aggression, cooling deposits, repeated movement, clamping force, ejection stress and millions of cycles. And like any mechanical system, it does not usually become a problem overnight.

It slowly loses control. First, the process needs small adjustments. Then flash starts to appear. Then dimensions begin to drift. Then cooling becomes less efficient.

After that, cycle time increases, cavity balance changes and quality starts asking for more checks. By the time purchasing sees the problem, the technical degradation has usually been visible for some time. This is why mould performance should be monitored as part of 𝘀𝗲𝗿𝗶𝗮𝗹 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗿𝗶𝘀𝗸.

Tool care is much more than basic maintenance. It includes monitoring parting lines, vents, slides, lifters, inserts, ejectors, cooling channels, hot runner behaviour, wear areas, corrosion, deposits, polishing condition, shut-off surfaces and the history of engineering changes. A small issue in one of these areas can influence myriad variables. These are signals that the production system may start losing stability.

For example, reduced venting can create burns or filling instability. Cooling deposits can increase cycle time and affect shrinkage. Insert wear can change local dimensions. Poor ejector condition can create marks, deformation or inconsistent release. These may become 𝗰𝗼𝘀𝘁, 𝗱𝗲𝗹𝗮𝘆 𝗮𝗻𝗱 𝗰𝘂𝘀𝘁𝗼𝗺𝗲𝗿 𝗽𝗿𝗲𝘀𝘀𝘂𝗿𝗲.

For purchasing, mould maintenance should be part of supplier evaluation because the supplier is protecting the asset that makes production possible. A supplier without strong tool care discipline may still produce good parts at launch but on the long-term stability will depend on luck, firefighting and corrective maintenance.

At , tooling is not treated as something that ends at SOP. The mould remains part of the 𝗶𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗮𝗹 𝘀𝘆𝘀𝘁𝗲𝗺.

A CMM report should never be read only as a list of green or red dimensions. In plastic injection, dimensional data is a 𝗱𝗶𝗮𝗴𝗻𝗼𝘀𝘁𝗶𝗰 𝗺𝗮𝗽 of the relationship between geometry, material behaviour, mould construction and process stability.

A part can pass the dimensional report and still carry hidden risk if too many characteristics are close to the tolerance limit. This is why CMM data should be 𝗶𝗻𝘁𝗲𝗿𝗽𝗿𝗲𝘁𝗲𝗱, 𝗻𝗼𝘁 𝗼𝗻𝗹𝘆 𝗮𝗿𝗰𝗵𝗶𝘃𝗲𝗱.

The risk becomes even more important when the same deviation pattern repeats across cavities, when a profile deviation indicates warpage or when true position depends too much on alignment strategy. Another hidden risk appears when the selected datum reference frame does not reflect how the part is actually assembled in the final product. On paper, the part may look compliant. In reality, the measurement logic may already be disconnected from the functional logic of the component.

The technical value of a CMM analysis is in understanding what the measurement pattern says about the 𝗳𝘂𝘁𝘂𝗿𝗲 𝗽𝗿𝗼𝗰𝗲𝘀𝘀. A repeated deviation on a rib, boss, clip, sealing surface or fixing point may indicate shrinkage imbalance, cooling asymmetry, gate influence, fibre orientation, ejection stress or local deformation after demoulding.

A feature that is inside tolerance but already consuming 80–90% of the tolerance field may become a serial production issue once material batch variation, machine variation, cavity temperature, tool wear or environmental conditions enter the equation. The report may say “approved”, but the process may already be 𝘁𝗼𝗼 𝗰𝗹𝗼𝘀𝗲 𝘁𝗼 𝘁𝗵𝗲 𝗲𝗱𝗴𝗲.

Two suppliers can submit approved dimensional reports, but they may not have the same risk level. One supplier may have centred dimensions, stable cavity-to-cavity behaviour and a clear understanding of GD&T interpretation. On paper, both suppliers look compliant. In reality, 𝗼𝗻𝗲 𝗶𝘀 𝗶𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗮𝗹𝗹𝘆 𝘀𝗮𝗳𝗲𝗿 𝘁𝗵𝗮𝗻 𝘁𝗵𝗲 𝗼𝘁𝗵𝗲𝗿.

At , CMM and PC-DMIS analysis are used not only to measure the part, but to 𝗿𝗲𝗮𝗱 𝘁𝗵𝗲 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗯𝗲𝗵𝗶𝗻𝗱 𝘁𝗵𝗲 𝗽𝗮𝗿𝘁.

In plastic injection projects, measurement is often treated as the final confirmation of quality, but in reality it is 𝗼𝗻𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗳𝗶𝗿𝘀𝘁 𝗽𝗹𝗮𝗰𝗲𝘀 𝘄𝗵𝗲𝗿𝗲 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗿𝗶𝘀𝗸 𝗰𝗮𝗻 𝗯𝗲 𝗱𝗶𝘀𝘁𝗼𝗿𝘁𝗲𝗱.

A part can be dimensionally stable and still appear unstable if the measurement system is weak. The opposite is also dangerous: a process can already be drifting, but if the measuring method has poor repeatability, fixture instability, operator influence or unclear datum positioning, the data will hide the real variation. This is where many commercial discussions become 𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗹𝘆 𝗰𝗼𝗻𝘁𝗮𝗺𝗶𝗻𝗮𝘁𝗲𝗱.

The Purchasing department may see rejected parts, delayed approvals, customer claims or supplier disputes, but the real root cause may not be the part, the mould or the process. It may be 𝘁𝗵𝗲 𝗺𝗲𝗮𝘀𝘂𝗿𝗲𝗺𝗲𝗻𝘁 𝘀𝘆𝘀𝘁𝗲𝗺 𝗶𝘁𝘀𝗲𝗹𝗳.

Before a team starts asking for tool corrections or process changes they should understand if the measuring system can actually separate part-to-part variation from measurement variation. Repeatability, reproducibility, fixture concept, operator influence, measuring force, part positioning, temperature conditions, datum strategy and number of distinct categories are not abstract metrology details.

It may also start disputing parts that are within normal variation or approving a capability study built on unstable data. For purchasing, this has a direct commercial impact. 𝗕𝗮𝗱 𝗺𝗲𝗮𝘀𝘂𝗿𝗲𝗺𝗲𝗻𝘁 𝗰𝗿𝗲𝗮𝘁𝗲𝘀 𝗳𝗮𝗹𝘀𝗲 𝗻𝗲𝗴𝗼𝘁𝗶𝗮𝘁𝗶𝗼𝗻𝘀, 𝗳𝗮𝗹𝘀𝗲 𝗰𝗹𝗮𝗶𝗺𝘀 𝗮𝗻𝗱 𝗳𝗮𝗹𝘀𝗲 𝗰𝗼𝗻𝗳𝗶𝗱𝗲𝗻𝗰𝗲. It can trigger unnecessary rework and tension between supplier and customer.

A supplier with real metrology maturity does not only send numbers but they do understand how those numbers were generated, how much uncertainty is inside them and whether the measurement system is suitable for the tolerance being evaluated. At , 𝗺𝗲𝘁𝗿𝗼𝗹𝗼𝗴𝘆 𝗶𝘀 𝗻𝗼𝘁 𝘀𝗲𝗽𝗮𝗿𝗮𝘁𝗲𝗱 𝗳𝗿𝗼𝗺 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗹𝗼𝗴𝗶𝗰.

𝐏𝐫𝐨𝐜𝐮𝐫𝐞𝐦𝐞𝐧𝐭 𝐭𝐚𝐤𝐞𝐚𝐰𝐚𝐲: When sourcing an injection moulded component, do not evaluate only the supplier’s answer to the drawing. Evaluate the quality of the questions, risks, and technical assumptions behind that answer.

𝐀 𝐝𝐫𝐚𝐰𝐢𝐧𝐠 𝐬𝐡𝐨𝐰𝐬 𝐭𝐡𝐞 𝐭𝐚𝐫𝐠𝐞𝐭, 𝐚𝐧𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐬𝐡𝐨𝐰𝐬 𝐭𝐡𝐞 𝐬𝐨𝐮𝐫𝐜𝐢𝐧𝐠 𝐫𝐢𝐬𝐤.

When a procurement manager has to make a sourcing decision, the technical drawing is one of the first documents to evaluate because it defines the geometry, dimensions, tolerances, and quality expectations.

But it should not be treated as the 𝐟𝐮𝐥𝐥 𝐫𝐢𝐬𝐤 𝐩𝐢𝐜𝐭𝐮𝐫𝐞.

A drawing can show what the part should look like. It cannot always show how difficult that part will be to produce consistently under 𝐫𝐞𝐚𝐥 𝐬𝐞𝐫𝐢𝐚𝐥 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐜𝐨𝐧𝐝𝐢𝐭𝐢𝐨𝐧𝐬.

During this stage of the sourcing, the decision should go beyond the 𝐩𝐫𝐢𝐜𝐞, 𝐜𝐚𝐩𝐚𝐜𝐢𝐭𝐲 𝐚𝐧𝐝 𝐥𝐞𝐚𝐝 𝐭𝐢𝐦𝐞.

The procurement manager should not evaluate only whether a supplier says, “𝐘𝐞𝐬, 𝐰𝐞 𝐜𝐚𝐧 𝐩𝐫𝐨𝐝𝐮𝐜𝐞 𝐢𝐭.” because that answer is not enough. And never will.

The relevant question is how the supplier understands the 𝐫𝐢𝐬𝐤𝐬 𝐛𝐞𝐡𝐢𝐧𝐝 𝐭𝐡𝐞 𝐝𝐫𝐚𝐰𝐢𝐧𝐠?

◼️Can the supplier explain how the material will flow through the geometry? ◼️Can they identify where cooling, shrinkage or warpage may create instability?
◼️Can they point out which dimensions are truly sensitive in production, not only on paper?

What is not relevant enough is a simple confirmation that the part is feasible.

What is relevant is the supplier’s ability to 𝐭𝐫𝐚𝐧𝐬𝐥𝐚𝐭𝐞 𝐭𝐡𝐞 𝐝𝐫𝐚𝐰𝐢𝐧𝐠 𝐢𝐧𝐭𝐨 𝐚 𝐬𝐭𝐚𝐛𝐥𝐞 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐥𝐨𝐠𝐢𝐜.

For Star Plast Engineering this is where technical expertise becomes valuable in sourcing decisions.

The drawing is not evaluated in isolation. It is read together with the 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥, 𝐭𝐡𝐞 𝐦𝐨𝐮𝐥𝐝 𝐜𝐨𝐧𝐜𝐞𝐩𝐭, 𝐭𝐡𝐞 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐰𝐢𝐧𝐝𝐨𝐰, 𝐭𝐡𝐞 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐫𝐞𝐪𝐮𝐢𝐫𝐞𝐦𝐞𝐧𝐭𝐬 𝐚𝐧𝐝 𝐭𝐡𝐞 𝐟𝐮𝐭𝐮𝐫𝐞 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐜𝐨𝐧𝐝𝐢𝐭𝐢𝐨𝐧𝐬.

𝐏𝐫𝐨𝐜𝐮𝐫𝐞𝐦𝐞𝐧𝐭 𝐭𝐚𝐤𝐞𝐚𝐰𝐚𝐲: Do not evaluate only what the material costs. Evaluate how the supplier understands its behaviour before it becomes a production risk.

𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐬𝐞𝐥𝐞𝐜𝐭𝐢𝐨𝐧 𝐢𝐬 𝐧𝐨𝐭 𝐨𝐧𝐥𝐲 𝐚 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐝𝐚𝐭𝐚 𝐬𝐡𝐞𝐞𝐭 𝐝𝐞𝐜𝐢𝐬𝐢𝐨𝐧 because in plastic injection, two materials can look comparable during RFQ evaluation.

Similar properties. Similar certifications. Similar price level. Similar availability.

But once they enter production, they can behave very differently.

A material should not be evaluated only by what is written on paper, but by how it behaves 𝐢𝐧𝐬𝐢𝐝𝐞 𝐭𝐡𝐞 𝐦𝐨𝐮𝐥𝐝, 𝐢𝐧𝐬𝐢𝐝𝐞 𝐭𝐡𝐞 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐚𝐧𝐝 𝐢𝐧𝐬𝐢𝐝𝐞 𝐭𝐡𝐞 𝐟𝐢𝐧𝐚𝐥 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧.

Its flow can influence cavity filling. Its shrinkage can affect dimensional repeatability. Its glass fibre content can create warpage or change mechanical behaviour. Its temperature behaviour can influence 𝐜𝐲𝐜𝐥𝐞 𝐭𝐢𝐦𝐞, 𝐜𝐨𝐨𝐥𝐢𝐧𝐠 𝐬𝐭𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐚𝐧𝐝 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐜𝐨𝐧𝐭𝐫𝐨𝐥.

Even 𝐜𝐨𝐥𝐨𝐮𝐫, 𝐭𝐫𝐚𝐧𝐬𝐥𝐮𝐜𝐞𝐧𝐜𝐲 𝐚𝐧𝐝 𝐬𝐮𝐫𝐟𝐚𝐜𝐞 𝐟𝐢𝐧𝐢𝐬𝐡 can become production risks when they affect rejection rates, final validation, or customer perception.

For you, the procurement manager, this is where 𝐬𝐮𝐩𝐩𝐥𝐢𝐞𝐫 𝐤𝐧𝐨𝐰-𝐡𝐨𝐰 𝐦𝐚𝐭𝐭𝐞𝐫𝐬 and this is where you should pay attention to what the expertise of Star Plast Engineering can provide in terms of applicable experience.

”𝐓𝐡𝐞 𝐥𝐨𝐰𝐞𝐬𝐭 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐜𝐨𝐬𝐭 𝐢𝐬 𝐧𝐨𝐭 𝐚𝐥𝐰𝐚𝐲𝐬 𝐭𝐡𝐞 𝐥𝐨𝐰𝐞𝐬𝐭 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐜𝐨𝐬𝐭. A small saving during RFQ can later become scrap, rework, unstable dimensions, delayed PPAP approval, or delivery pressure.”

A competitive material price may look attractive before nomination, but a 𝐬𝐭𝐚𝐛𝐥𝐞 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥-𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐜𝐨𝐦𝐛𝐢𝐧𝐚𝐭𝐢𝐨𝐧 𝐩𝐫𝐨𝐭𝐞𝐜𝐭𝐬 𝐪𝐮𝐚𝐥𝐢𝐭𝐲, 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 𝐚𝐧𝐝 𝐥𝐨𝐧𝐠-𝐭𝐞𝐫𝐦 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐜𝐨𝐬𝐭 𝐚𝐟𝐭𝐞𝐫 𝐧𝐨𝐦𝐢𝐧𝐚𝐭𝐢𝐨𝐧.

𝐏𝐫𝐨𝐜𝐮𝐫𝐞𝐦𝐞𝐧𝐭 𝐭𝐚𝐤𝐞𝐚𝐰𝐚𝐲: Do not evaluate only if the supplier can inject the part. Evaluate how they protect the operations that follow after moulding.

𝐀 𝐩𝐥𝐚𝐬𝐭𝐢𝐜 𝐜𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭 𝐬𝐡𝐨𝐮𝐥𝐝 𝐧𝐨𝐭 𝐛𝐞 𝐞𝐯𝐚𝐥𝐮𝐚𝐭𝐞𝐝 𝐨𝐧𝐥𝐲 𝐚𝐬 𝐚 𝐩𝐥𝐚𝐬𝐭𝐢𝐜 𝐜𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭.

In procurement, the part price can create the first comparison between suppliers, but only after the first moulded part, a clear and distinct comparison can be made.

The component may need to be 𝐚𝐬𝐬𝐞𝐦𝐛𝐥𝐞𝐝, 𝐰𝐞𝐥𝐝𝐞𝐝, 𝐩𝐫𝐢𝐧𝐭𝐞𝐝, 𝐥𝐚𝐬𝐞𝐫 𝐦𝐚𝐫𝐤𝐞𝐝, 𝐭𝐞𝐬𝐭𝐞𝐝 𝐨𝐫 𝐢𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐞𝐝 𝐰𝐢𝐭𝐡 𝐜𝐚𝐛𝐥𝐞𝐬, 𝐞𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜𝐬 𝐨𝐫 𝐨𝐭𝐡𝐞𝐫 𝐬𝐮𝐛𝐜𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬.

This is where our expertise provides us with a clear understanding of how the part will move through the 𝐟𝐮𝐥𝐥 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐚𝐥 𝐟𝐥𝐨𝐰.

◼️How the part will be positioned during assembly.

◼️How clips, ribs or fixing areas will behave in use.

◼️How tolerances will influence fixtures and functional testing.

◼️How handling surfaces can affect quality or visual appearance.

◼️How downstream operations can create rework, scrap or delays.

For 𝐒𝐭𝐚𝐫 𝐏𝐥𝐚𝐬𝐭 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠, know-how means looking beyond the 𝐦𝐨𝐮𝐥𝐝𝐢𝐧𝐠 𝐨𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧 𝐢𝐭𝐬𝐞𝐥𝐟. It means understanding the part as a component that must pass through 𝐬𝐞𝐯𝐞𝐫𝐚𝐥 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐬𝐭𝐞𝐩𝐬 𝐛𝐞𝐟𝐨𝐫𝐞 𝐫𝐞𝐚𝐜𝐡𝐢𝐧𝐠 𝐭𝐡𝐞 𝐟𝐢𝐧𝐚𝐥 𝐜𝐮𝐬𝐭𝐨𝐦𝐞𝐫.

𝐀 𝐠𝐨𝐨𝐝 𝐬𝐚𝐦𝐩𝐥𝐞 𝐝𝐨𝐞𝐬 𝐧𝐨𝐭 𝐞𝐥𝐢𝐦𝐢𝐧𝐚𝐭𝐞 𝐬𝐮𝐩𝐩𝐥𝐢𝐞𝐫 𝐫𝐢𝐬𝐤.

In procurement, a first acceptable sample can create confidence. However, confidence should not come only from being correct once.

It should come from understanding how that result will be repeated in serial production.

The experience of a supplier becomes visible not from a machine list, from a cost breakdown, or a nice first trial. It becomes visible through their way of creating a 𝐬𝐭𝐚𝐛𝐥𝐞 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 that 𝐬𝐭𝐚𝐛𝐢𝐥𝐢𝐳𝐞𝐬 𝐭𝐡𝐞 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐚𝐥 𝐩𝐡𝐚𝐬𝐞 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐫𝐞𝐝𝐮𝐜𝐢𝐧𝐠 𝐚𝐧𝐲 𝐨𝐟 𝐭𝐡𝐞 𝐚𝐠𝐫𝐞𝐞𝐝 𝐪𝐮𝐚𝐥𝐢𝐭𝐲.

◼️How the process window is defined.

◼️How critical dimensions are monitored.

◼️How cycle time is stabilized.

◼️How deviations are detected.

◼️How quality gates are positioned.

◼️How the mould behaviour is observed after repeated cycles.

◼️How operators, engineers and quality teams react when the process starts to move outside the expected limits.

This is the difference between 𝐩𝐫𝐨𝐝𝐮𝐜𝐢𝐧𝐠 𝐚 𝐠𝐨𝐨𝐝 𝐬𝐚𝐦𝐩𝐥𝐞 and 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐚 𝐬𝐭𝐚𝐛𝐥𝐞 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐚𝐥 𝐩𝐫𝐨𝐜𝐞𝐬𝐬.

Procurement managers should be aware that for 𝐒𝐭𝐚𝐫 𝐏𝐥𝐚𝐬𝐭 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠, the added value relies on the way that 𝐤𝐧𝐨𝐰-𝐡𝐨𝐰 𝐢𝐬 𝐭𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐞𝐝 𝐢𝐧𝐭𝐨 𝐫𝐞𝐚𝐥𝐢𝐭𝐲 𝐝𝐮𝐫𝐢𝐧𝐠 𝐭𝐡𝐞 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐚𝐥 𝐩𝐡𝐚𝐬𝐞.

It means looking at the 𝐩𝐚𝐫𝐭, 𝐭𝐡𝐞 𝐦𝐨𝐮𝐥𝐝, 𝐭𝐡𝐞 𝐦𝐚𝐭𝐞𝐫𝐢𝐚𝐥 𝐚𝐧𝐝 𝐭𝐡𝐞 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐚𝐬 𝐨𝐧𝐞 𝐜𝐨𝐧𝐧𝐞𝐜𝐭𝐞𝐝 𝐬𝐲𝐬𝐭𝐞𝐦. It also means identifying early the risks that could affect 𝐏𝐏𝐀𝐏 𝐚𝐩𝐩𝐫𝐨𝐯𝐚𝐥, 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐨𝐫 𝐥𝐨𝐧𝐠-𝐭𝐞𝐫𝐦 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐬𝐭𝐚𝐛𝐢𝐥𝐢𝐭𝐲

𝐀 𝐠𝐨𝐨𝐝 𝐬𝐚𝐦𝐩𝐥𝐞 𝐦𝐚𝐲 𝐰𝐢𝐧 𝐭𝐫𝐮𝐬𝐭. 𝐁𝐮𝐭 𝐚 𝐯𝐚𝐥𝐢𝐝𝐚𝐭𝐞𝐝 𝐩𝐫𝐨𝐜𝐞𝐬𝐬 𝐩𝐫𝐨𝐭𝐞𝐜𝐭𝐬 𝐜𝐨𝐬𝐭, 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐚𝐧𝐝 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 𝐚𝐟𝐭𝐞𝐫 𝐧𝐨𝐦𝐢𝐧𝐚𝐭𝐢𝐨𝐧.

𝐏𝐫𝐨𝐜𝐮𝐫𝐞𝐦𝐞𝐧𝐭 𝐭𝐚𝐤𝐞𝐚𝐰𝐚𝐲: Do not evaluate only what the supplier can produce once. Evaluate how they prove that the result can be repeated under controlled industrial conditions.