The short version
- Send the real product, not a drawing. Almost every problem we catch early comes from holding the actual part.
- Wood before aluminium. A cheap wooden trial mould proves the geometry so the production tool is right the first time.
- Approval means approval with your product in the tray, packed the way it will really be packed — not a sample admired on a desk.
- Nesting decides your piece price more than almost anything else. It is settled at the layout stage, before any tool is cut.
- Timeline is working days, not months, because the tool is single-sided aluminium cut in-house rather than matched hardened steel.
What happens first when you send us a product?
We put your product on a table and look at it — how it sits, which face is stable, where it is fragile, how it varies from unit to unit. Then we tell you what a tray for it would look like, in what material, at what gauge, and roughly what it will cost.
This is the design-for-manufacture review, and it is the highest-value stage in the whole project because everything downstream inherits its decisions. Nothing has been cut yet, so changing our minds is free.
What we are working out at this stage:
- Orientation. Which way up does the product sit, and what holds it there? Gravity, friction, a rib, or a lid?
- Depth. How much of the product must be below the tray rim to be held securely? This sets your draw depth. Our maximum is 75 mm, and most trays need far less.
- Draft. Every wall needs an angle so the part releases from the tool and stacks in transit. Vertical walls are the single most common thing we have to negotiate out of a customer drawing.
- Radii. Sharp internal corners thin the material badly. Generous corner radii are free strength.
- Undercuts. Vacuum forming pulls one face of a sheet onto a tool. Deep undercuts either cannot be released or need a tool feature that adds cost. Shallow ones are usually fine.
- Material and gauge. Clear or opaque, recycled or virgin, and how thick the sheet must start so the thinnest corner is still strong enough.
What can go wrong here: a buyer sends a nominal 3D model of a product that in reality has a flash line, a variable label thickness or a tolerance stack. The tray then fits the model and not the product. We ask for the worst physical sample you have, not the best.
What you should supply: two or three real units, the annual quantity, whether the tray goes into a box or onto a shelf or into an automated line, and any specification your own customer has imposed. If your product will change in the next year, say so now — it changes what we recommend.
How is the cavity layout and nesting decided?
We work out how many cavities fit onto the sheet within our forming area of 600 × 600 mm, and how tightly they can pack. That number sets your piece price more directly than any other single decision in the project.
Thermoforming produces parts by the sheet, not by the piece. Each cycle forms one sheet, and everything that fits on that sheet is made for the same amount of machine time and heat. So the arithmetic is simple: more cavities per sheet, lower cost per cavity.
What we are trading off:
- Web width. The material between cavities has to be wide enough to clamp, seal and trim cleanly. Too narrow and the parts distort or the trim tool wanders.
- Orientation. Rotating a rectangular part by 90 degrees, or staggering alternate rows, can gain a cavity per sheet without changing the part at all.
- Edge margin. The perimeter of the sheet is held in the clamp frame and cannot be used, which is why very large single parts have poor sheet utilisation.
- Trim geometry. A rectangular trim outline wastes less than a shaped one and punches more cleanly.
This is also where we can find you money. A tray that is 4 mm shorter, or a flange that is 2 mm narrower, will sometimes let another row fit on the sheet. That is a permanent reduction in your piece price for a change nobody will ever notice. It is worth asking us the question before the drawing is frozen.
What can go wrong: the layout is optimised for material and forgets how the tray will be handled. Trays that nest too tightly are slow to separate on a packing line, which costs your operator time every single day. Tell us if the trays will be de-nested by hand at speed.
Why do you cut a wooden trial mould first?
Because the first version of a cavity is almost never the final one, and wood is cheap and quick to cut. The trial mould gets real formed samples into your hands in days, and any change is a re-cut rather than a re-machined aluminium tool.
The trial mould is a working mould, not a mock-up. It is cut to the intended geometry, vented, and run on a real forming machine with real sheet. The samples that come off it are the same shape and roughly the same material distribution as production parts. What it will not do is survive a long run, hold tight repeatability across thousands of cycles, or give the surface finish of machined aluminium.
That is exactly the right trade. You are not buying parts at this stage. You are buying certainty about the geometry.
What typically changes after the first trial:
- Cavity depth, because the product sits deeper or shallower than expected once you hold it.
- Fit clearance, because the product varies more than the drawing.
- Draft angle on one wall, because release is stiff or the part scuffs coming off.
- A rib or a step added to stop the product moving sideways.
- Rim geometry, because the tray has to sit in a box or stack in a column.
None of those are failures. They are the entire purpose of the stage. A project where nothing changes at the trial mould usually means nobody checked properly.
What happens at the sample and approval stage?
You get formed samples from the trial mould with your product in them, you test them properly, and you either approve the geometry or tell us what to change. Nothing else moves until that decision is made, because everything after it is expensive to undo.
What we want you to check, in order of how often it catches something:
- Fit with your worst product unit, not your best. If it is a moulded part, the one with the biggest flash. If it is a filled bottle, a full one.
- Retention. Turn the loaded tray upside down. Does the product stay put? Should it?
- Loading and unloading speed. Time an operator loading twenty. A tray that takes an extra two seconds per unit costs you real money forever.
- Nesting and de-nesting. Stack fifty empty trays. Do they separate easily?
- Fit in the outer. Put the loaded tray in the actual box or carton, with the actual lid.
- Wall strength at the deep corners. Press with a thumb. If it feels thin there, the starting gauge needs to go up.
- Appearance where it shows. Clarity, gloss, any witness lines, and whether the rim looks straight from a metre away.
What can go wrong: approval given by someone who has not tried packing with it. The most expensive version of this is a tray approved by a design team and rejected by a packing supervisor three months later. Get the person who will actually use the tray to sign it off.
Send us the product and we will take it from there
A photo is enough to start a conversation. A physical sample is enough to start a project. We will tell you the format, the material, the gauge and the layout — and if thermoforming is the wrong process for your part, we will tell you that too.
How is the aluminium production tool made?
We machine it in-house at Noida from the geometry proved on the trial mould, then drill the vacuum vents that let air escape as the sheet arrives. Because the geometry is already settled, the aluminium tool is a manufacturing job rather than a design experiment.
Aluminium is the right material for a production forming tool for three reasons. It machines quickly, so lead time is short and modifications are cheap. It conducts heat well, so it pulls heat out of the formed sheet evenly and lets the cycle run faster. And it is soft enough to cut but hard enough to run for years, because a forming tool never has to resist melt pressure — it only has to hold a shape while about one bar of atmospheric pressure presses sheet onto it.
The details that separate a good tool from a mediocre one:
- Vent placement. Vents go where air would otherwise be trapped — the deepest corners and the bottoms of pockets. Too few and the part will not reach the tool; too many or too large and they leave visible pips on the part.
- Surface finish. A slightly textured tool face releases better than a polished one and hides minor marks.
- Temperature control. A tool that runs at a stable temperature produces stable parts. A tool that heats up through a shift produces parts that change through a shift.
- Cavity spacing that matches the trim tool, so forming and trimming register against each other with no accumulating drift across the sheet.
Making tools ourselves rather than buying them means a change is a scheduling decision, not a procurement exercise. What drives the cost of that tool — footprint, cavity count, depth, complexity — is set out in how much a thermoforming mould costs in India.
How is the sheet chosen and prepared?
We select material and starting gauge so that the thinnest point in the finished part is still strong enough, then let the sheet acclimatise to the shop floor before it is formed. Sheet that goes onto the machine cold or damp does not behave.
We form four materials and only four: A-PET, rPET, PVC and HIPS, from 200 to 2000 micron. We do not form PETG or PP. The rPET and HIPS we use are recycled as standard, supplied with a self-certified recycled-content declaration — over half our total output runs on recycled material.
Gauge selection is the part buyers find counter-intuitive. In thermoforming you do not specify a wall thickness; you specify a starting sheet thickness and the geometry decides where that material ends up. Material that travels furthest into the deepest corner stretches most and finishes thinnest. So the question is never "what wall do I want", it is "how thin will the worst corner be, and is that enough". A deeper tray therefore needs a heavier sheet even though the tool has barely changed — which is why draw depth shows up in your piece price.
Before forming, sheet is unpacked and allowed to reach shop-floor temperature and humidity. PET-family sheets in particular pick up moisture, and forming damp sheet gives you bubbles, haze or a rough surface. In a Noida summer, sheet coming out of an air-conditioned store into a hot forming hall will sweat if it goes straight onto the machine. Letting it stand is not a formality.
What can go wrong: a mid-run change of sheet lot with a slightly different gauge tolerance or a different recycled fraction. Both are normal in the market and both change how the sheet draws. This is why batch traceability matters — if a shift's output looks different, you need to be able to tie it back to a specific sheet lot.
What actually happens during the forming cycle?
The sheet is clamped in a frame, heated until it sags to a controlled degree, moved over the mould, and the air beneath it is evacuated. Atmospheric pressure presses the softened sheet onto the tool, it cools against the aluminium, and the formed sheet is released.
Written out, the cycle is:
- Clamp. The sheet is held around its perimeter in a frame. Anything inside the clamp line is usable; anything outside is not.
- Heat. Radiant heaters bring the sheet to forming temperature. This is the most skilled part of the operation. Too cold and the sheet will not reach the corners; too hot and it thins, webs, sags or scorches. Heat has to be even across the sheet, which means zoned control and an operator who watches the sag.
- Index. The hot sheet moves over the tool.
- Form. Vacuum evacuates the air between sheet and tool. Around one bar of atmospheric pressure does the forming. This takes a fraction of a second.
- Cool. The part holds against the tool while it drops below its set temperature. This is usually the longest part of the cycle and it is what limits output.
- Release. Vacuum is broken, sometimes with a puff of air to help the part off, and the formed sheet moves on to trimming.
Our forming envelope is 600 × 600 mm with draw depth up to 75 mm, and total capacity is around 10 lakh pieces a month.
What can go wrong at the machine: webbing, where excess material folds into a pleat between two close cavities — a layout and heat problem. Thin corners, where the sheet ran out of material before reaching the bottom of a deep pocket. Chill marks, where the sheet touched something cold on its way. Warp, where the part came off the tool before it had cooled enough. All of these are visible to a trained eye at the machine, which is why the first parts of every run are checked before the run continues.
How are the parts trimmed, punched and folded?
The formed sheet goes to a press where the parts are cut out of the web, and where any punching — hang holes, rivet holes, ventilation slots — is done in the same operation. For folding blisters we also fold the part in-house, so it leaves us as a finished folded component.
Trimming is a register problem more than a cutting problem. The trim tool has to line up with cavities that were formed a few seconds earlier in a sheet that has shrunk slightly as it cooled. That shrinkage is predictable and is designed into the trim tool, but it varies with material and with how hot the sheet was. Registration drifting across a wide sheet is the classic symptom of a trim tool cut without allowing for it.
What comes off this stage:
- Finished parts, trimmed to outline, deburred at the edges.
- Punched features where required — euro hang slots, round hang holes, rivet holes for folding blisters, drain or ventilation holes for trays.
- Folded parts, where the format calls for it. Because we form, punch and fold under one roof, the fold line, the punch position and the forming shrinkage can be corrected against each other in a single conversation rather than across three suppliers.
- Skeletal web, which is collected and reprocessed rather than discarded.
What can go wrong: a sharp or rough cut edge. On a retail pack that is a customer complaint; on a medical tray it is a rejection. Edge quality is a tool-sharpness and press-setting issue and it degrades gradually, which means it has to be checked through the run rather than only at the start.
How are the parts inspected before they ship?
First-off approval at the start of every run, in-process checks through the shift, and a final check before packing. The checks are the same ones you did on the sample, run against a retained approved sample kept with the job.
| Stage | What is checked | Why it matters | Typical failure caught |
|---|---|---|---|
| First off, at the machine | Fit against the retained sample and the real product, depth, corner thickness by feel and gauge | Stops a whole shift being made wrong | Heat profile drifted overnight; sheet lot changed |
| Forming, in process | Webbing, chill marks, thin corners, clarity, warp on a flat surface | These drift gradually as the tool warms through a shift | Tool temperature rise causing shallow or soft corners |
| Trimming | Register to the cavity, edge quality, burrs, punch position and hole size | Edge quality degrades as the tool dulls | Rough edges; hang hole drifting off centre |
| Folding, where applicable | Squareness when closed, hinge integrity, no stress whitening at the fold | A hinge that splits in the warehouse is a total loss | Fold made on sheet that was too cold |
| Dimensional | Overall length, width, height, rim flatness, stack height of a fixed count | Catches cumulative shrinkage drift | Tray no longer dropping into the customer's box |
| Cleanliness | Dust, fibre, static pickup, handling marks on visible faces | Critical for medical, device and cosmetics work | Static attracting dust during de-nesting |
| Final, before packing | Count, retained sample comparison, batch identification on the carton | Traceability if anything is questioned later | Mixed lots in one carton |
For medical device, pharmaceutical and cosmetics work we form in a controlled forming room: filtered air, gowning, restricted entry, segregated material handling and batch traceability. It is not a formally ISO-classified cleanroom and we do not claim an ISO class. It is a documented, controlled environment, and it is what supplier auditors from customers including Healthium, Auxein and Pigeon have examined. If your specification requires a classified cleanroom, say so at enquiry stage so nobody wastes time.
What happens at packing and dispatch?
Parts are counted, nested into sleeves or bags, boxed with batch identification, and dispatched pan-India or to the NSEZ export houses we supply. How they are packed is a decision worth making deliberately, not by default.
Packing choices that actually affect you:
- Count per sleeve. Should match how your line consumes them. A sleeve of 50 when your operator works in batches of 25 wastes handling time twice a day.
- Nesting tightness. Tight nesting saves freight and slows de-nesting. Loose nesting does the opposite. Tell us which side you want to be on.
- Interleaving. For high-gloss clear parts, a slip sheet or a light interleave prevents scuff marks between adjacent parts.
- Static. Clear PET picks up charge during de-nesting and attracts dust. If the parts go into a clean assembly area, this matters and there are things we can do about it.
- Carton marking. Part number, batch, count and date on the outside. Trivial to do, invaluable when a question comes up nine months later.
What can go wrong: the parts are perfect and the carton is crushed. Formed trays are strong in the axis they nest along and weak across it. A carton that is stacked on its side in a truck can flatten a column of trays that would have survived any amount of vertical load.
What does the whole sequence look like end to end?
Eleven stages, of which you are actively involved in four. The rest is our problem. What you control is the quality of the brief, the honesty of the sample testing and the speed of approval.
| # | Stage | What you supply | What you get back | Biggest risk |
|---|---|---|---|---|
| 1 | Brief and DFM review | Real product, quantity, application, any specification | Format, material, gauge and indicative price | Working from a nominal model instead of a real part |
| 2 | Cavity layout and nesting | Willingness to flex dimensions slightly | Cavities per sheet, confirmed piece price | Freezing a drawing before layout is optimised |
| 3 | Wooden trial mould | Nothing | A working mould in days | Skipping it to save time, then paying for it in aluminium |
| 4 | First samples | Product to load them with | Formed parts in your hands | Evaluating on a desk instead of on a line |
| 5 | Review and re-cut | Specific, written feedback | Revised samples | Vague feedback that cannot be acted on |
| 6 | Approval | Sign-off from the person who will use the tray | A retained approved sample held with the job | Approval by someone who has never packed with it |
| 7 | Aluminium production tool | Nothing | A tool cut in-house, vented and trialled | None, if stages 3 to 6 were done properly |
| 8 | Sheet selection and conditioning | Confirmation of material and recycled-content need | Material with documentation and batch identity | Lot-to-lot variation mid-run |
| 9 | Forming | Nothing | Formed sheet | Heat profile drift through a shift |
| 10 | Trimming, punching, folding | Nothing | Finished parts | Trim register drift; edge quality as tools dull |
| 11 | Inspection, packing, dispatch | Pack format and delivery instructions | Counted, marked, traceable cartons | Pack count that does not match your line |
The two stages with hard numbers: after you approve the sample, the production tool takes about a week to finish, and the first full run takes two to three weeks after that. Everything before sample approval moves at the speed of the decisions, not the machines.
What should you ask any thermoformer before placing a tooling order?
Five questions. The answers tell you more about a supplier than any brochure, and any competent former will answer them without hesitating.
- Do you make your own tooling? In-house tooling means changes are scheduled, not procured. Ours is cut at Noida.
- Will I get samples from a trial mould before you cut the production tool? If the answer is no, you are paying for a first attempt at production prices.
- What is your forming area and maximum draw depth? This decides what is possible at all. Ours is 600 × 600 mm and 75 mm.
- Which materials do you actually run? A short honest list beats a long one. We run A-PET, rPET, PVC and HIPS, and we say plainly that we do not form PETG or PP.
- How do you handle recycled content documentation? If you have an EPR obligation, you need a declaration in writing. Ours is a self-certified recycled-content declaration supplied with the material.
If you want the cost side of the same story, it is in thermoforming mould cost in India and tray cost per piece. If you are still deciding which format the tray should be, start with types of blister packaging.
Frequently asked questions
What do I need to send you to start a custom tray project?
Ideally the physical product, or two or three of them. Failing that, dimensioned photographs from the front, side and top with a scale in shot. Tell us the annual quantity, whether the tray goes into a box or onto a shelf, whether it must be clear or opaque, and any customer specification you have been given. A 3D file is useful but not required — most of the trays we make start from a real part on a table.
Why do you make a wooden trial mould before the aluminium one?
Because wood is cheap and fast to cut, and the first version of a cavity is almost never the final one. A wooden trial mould lets you hold formed samples with your real product sitting in them within days, and any change to fit, depth, draft or rib position is a quick re-cut rather than a re-machined aluminium tool. By the time we cut aluminium the geometry is proven, so the production tool is right the first time.
How long does the whole process take from enquiry to first delivery?
It is measured in working days rather than months, because thermoforming tooling is single-sided aluminium rather than matched hardened steel. The sequence is enquiry and design review, trial mould, samples for your approval, production tool, first production run, dispatch. The longest variable is usually how quickly samples are approved at your end, not how quickly we can cut a tool.
What is the most common reason a first sample fails?
Fit. The tray is right against the drawing and wrong against the product, because the product varies more than the drawing admits — a moulded part with a flash line, a bottle with a variable neck, an assembly whose tolerance stacks. That is why we ask for the real product, and preferably the worst example of it, rather than a nominal 3D model. The second most common reason is wall thinning at a deep corner, which is a gauge or draft question and is fixed on the trial mould.
Do you form medical and pharmaceutical trays in a cleanroom?
We run a controlled forming room with filtered air, gowning, restricted entry, segregated material handling and batch traceability. It is not a formally ISO-classified cleanroom and we do not claim an ISO class. For device and pharma customers who need documented control without a classified environment, this is what we operate, and it has been examined during supplier audits by Healthium, Auxein and Pigeon among others.