1. Process documentation and the recipe set
Glass forming is recipe-driven. The handover file should contain one documented recipe per product you intend to run, not a single factory demo. For each recipe, the document records the heating profile, the forming temperature window, the cycle structure, the chamber atmosphere setting, and the mold set matched to that glass thickness. On the forming machine we build, heating temperature and heating time are set and displayed on the touch screen, and recipes are saved on the machine so an operator recalls them instead of rebuilding parameters from notes.
What you should expect in the file: the recipe list with the product code each recipe belongs to; the parameter ranges an operator may adjust and the ranges that are locked to the engineer level; and a change log so that every later parameter edit has a date, an author and a reason. A supplier who will not hand over recipes in readable form is holding your process hostage.
2. Performance and quality records from the run-off
Buyers compare quotations on machine dimensions and forget the acceptance criteria. Put the numbers in the contract and demand the measured results in the handover package: cycle time per piece, product pass rate, failure rate over the qualification run, and the atmosphere figures that protect the glass surface. For the machine class listed on our site, the published envelope is a cycle time under 180 seconds per piece for glass up to 14 inches, a product pass rate of at least 80 percent, an equipment failure rate of no more than 2 percent, and a cavity oxygen content of 50 ppm or lower, with 30 molds in the normal cycle. Treat these as the shape of the specification to negotiate, and confirm the values for your own glass size and thickness before you sign.
Insist on measured data, not nameplate data. A run-off report should show the sample size, the time span of the run, the reject list with the cause of each reject, and the dimensional and optical results of the accepted pieces. If the run-off report contains only a sentence saying the machine passed, it is not a record.
3. Furnace, chamber and safety documentation
Hot bending runs at high temperature in a controlled atmosphere, which makes this the section most often left thin. Our forming machines heat at 600–850 ℃ with dual high-frequency heating, and the chamber atmosphere is monitored rather than assumed: four nitrogen-filled chambers are under circulating oxygen detection, with the controller holding the oxygen value. The handover package should include the heating system diagram, the thermocouple and controller calibration records, the nitrogen supply and monitoring arrangement, the interlock list, and the risk assessment for the hot zones and the mold handling steps.
Also ask for the consumable life data for molds and heating elements, with the symptoms that signal replacement. Forming molds wear, and a buyer who has no wear criteria will replace them either too early, which costs money, or too late, which costs yield.
4. Mold documentation and the mold-change procedure
Molds decide the shape accuracy of the curved glass, so the package must cover them as a separate deliverable. We build mold checking into the machine itself: the thickness of each mold is detected and monitored before discharge. Ask for the mold drawings with the drawing revision, the mold material specification, the matched mold set for each product, the storage and handling rules, and the measured dimensional report of the molds you are buying. If you plan to run more than one product family, the package should include the mold-change procedure with the expected change time, because the change time is where a multi-product line quietly loses capacity.
5. Software, controls and data interfaces
Touch-screen machines generate the data your quality department will want, but only if the access is handed over. The package should list the control hardware and software version, the parameter and recipe structure, the alarm list with the meaning and the corrective action of each alarm, the data export format, and any interface points for your MES or factory data collection. If you intend to trace each piece back to its forming parameters, state that requirement in the order; retrofitting traceability into a delivered line is more expensive than asking for it at quotation.
6. Training, maintenance and spare parts
A machine is only as good as the crew that maintains it. The handover file should include operator and maintenance training materials in the language your staff actually work in, a training attendance record, the preventive maintenance schedule with intervals, the lubrication and inspection list, and the recommended spare-parts list split into wear parts, critical spares you should stock on site, and long-lead items to order in advance. Add the remote support route and the on-site response commitment, with the same numbers that appear in the contract.
Ask our engineers for the handover index before you place the order and compare suppliers against that index. Two machines can look identical on a datasheet and deliver very different years of operation, depending on whether the recipes, records, mold data, and spare-parts plan came with the equipment.
Frequently asked questions
Who writes the handover package, the supplier or the buyer?
The supplier writes it; the buyer defines it. Send your index with the purchase order and require the package as a condition of final payment and acceptance.
Should the recipes be handed over with the machine?
Recipes for your own glass and your own product should be delivered on the machine and in the document. Supplier know-how on glass formulations is a separate matter and is usually kept by the supplier.
What is the minimum acceptable package for a first machine?
Recipe set for your products, measured run-off report with the reject list, calibration and safety records, mold drawings and wear criteria, spare-parts list, and training records. Anything less leaves you reconstructing the process yourself.
