1. Start with the product, not the machine
Write the first paragraph about the part you are making. State the substrate material and thickness, the overall dimensions, and whether the surface is flat, curved, or three-dimensional. A flexible OLED module, a large LCD bonded to an aluminum plate, and a membrane electrode assembly all look similar in a procurement sheet until the geometry is written down.
Then describe the layer stack in the order it is assembled: which film is placed against which surface, which adhesive is used, and whether air or moisture is allowed to remain between layers. If your current process has a step where bubbles appear and a separate debubbling station removes them, say so. Suppliers working on semiconductor process equipment need this sequence, because bonding, laminating, and debubbling decisions are connected.
2. Turn quality targets into numbers a machine can be measured against
The sentence “high yield” does not survive an engineering review. Replace it with the measurements your inspectors actually record. For bonding work these usually include:
- Positioning accuracy between film and substrate, expressed as a maximum tolerance in millimetres.
- Allowed size and number of bubbles or inclusions after bonding, and where on the part they are acceptable.
- Process temperature range and, where a vacuum chamber is involved, the pressure level required during the cycle.
- Press force or roller pressure, if the process depends on it.
- How defects are inspected today, whether by CCD vision, manual review under a lamp, or a downstream electrical test.
Include samples of your worst acceptable parts and your best parts. Photographs of real defects, with the location marked, tell a supplier far more than a specification sentence. If you already track scrap reasons, attach the top three.
3. State throughput in the form your line actually experiences
Give three numbers: the cycle time you want for one part, the pieces per hour the cell must deliver, and the number of shifts the machine will run. Add whether changeovers between product sizes happen during a shift or only between batches.
Also write down what you consider a reasonable availability target and how planned maintenance is scheduled. Equipment listed as an OLED laminating machine supplier reference, for example, is quoted against a cycle time measured on a specific test part; a buyer comparing that figure with their own line needs to know which part and which conditions produced it. Ask suppliers to state the test conditions with every number they send back.
4. Provide the factory constraints before the machine arrives
Floor space, door width, and lift capacity decide whether an assembled machine can be moved into position. Send the utility data your site can supply: available voltage, air supply pressure and dryness, exhaust or nitrogen availability, chiller capacity, and whether the area is temperature and humidity controlled.
If your process requires a controlled atmosphere, state it explicitly. Nitrogen chambers, gloveboxes, and vacuum chambers each bring different installation requirements, and discovering that late changes both the quotation and the schedule. Where a cleanroom entry procedure applies, describe the pass-through size and the cleanliness class.
5. Describe your team and what you expect the supplier to do
State who will operate the equipment, who will maintain it, and what language the manuals and training must use. A plant with one process engineer and shift technicians needs different documentation than a team with in-house automation support.
Then say plainly which part of the work is yours and which is the supplier’s. A request that only needs a single station reads very differently from one that needs a full cell with handling, vision alignment, and a line controller. If you are open to a supplier building the machine around your process rather than selling a standard model, write that too; non-standard automation equipment work usually starts with that statement. Note in the same section whether you have already built a prototype fixture, since existing fixtures often set the machine footprint.
6. Add the commercial information that changes the design
Volume, budget range, and the date you need the equipment on site all affect whether a supplier proposes one robust machine or a line with spare capacity. Write the date as a hard milestone and identify which events depend on it, such as a customer audit or a product launch.
Include your acceptance method. If the machine must pass a trial run on your own materials before payment, say how long that trial lasts and which parts will be supplied for it. State the required spare-parts list, warranty expectations, and whether on-site commissioning is included.
7. Send attachments and mark what is missing
A useful attachment set is short: a drawing of the part with dimensions, photographs of the assembly before and after bonding, defect photographs, a sample of an existing process sheet, and a layout sketch of the cell.
Mark unknown values as unknown rather than leaving them out. A line reading “vacuum level not yet defined, needs supplier recommendation” invites a proposal for a chamber and a pressure range. An empty field invites silence. This single habit usually saves one full round of correspondence.
A brief you can reuse
Keep the document to one page plus attachments, and use the same headings for every enquiry so quotations can be compared side by side. A practical order is: product and materials; layer stack and process steps; quality targets with numbers; throughput and shifts; factory utilities and space; scope of supply and support expected; volume, budget, and dates; acceptance method; attachments. Where you have not yet chosen an equipment partner, start from the contact page and send the brief with your part drawings.
Two checks before you press send are worth the time. First, read every number and ask whether a machine could be built to it; if a supplier could interpret it two ways, rewrite the sentence. Second, confirm that the same document answers the question “what would stop this machine from working in our plant?” If it does not, add one paragraph about your constraints. Suppliers respond faster, and the differences between their proposals become visible at the first reading instead of the third.
