Gummy Mold Depositing Alignment: Tray Registration for Semi-Auto Lines

A semi-auto gummy depositor hitting cavity edge instead of center wastes 8% fill weight per shift - misalignment you fix with tray registration, not operator guesswork. RUUIPON builds custom gummy molds at MOQ 50 with prototypes in 3-7 days. This guide sets depositing alignment specs so your nozzles center every cavity on the first production run.

Quick answer: Spec tray registration pins ±0.1 mm to depositor nest, cavity center grid ±0.2 mm cumulative, tray flatness ±0.3 mm, Shore A 20-25 for starch or oil release. Walls 2.5-5 mm, spacing 8-20 mm - vacuum-degassed platinum silicone (~0.1% shrink) holds grid after 500 deposit cycles.

Depositing Alignment Spec in One Table

Spec	Tolerance	Measurement method
Registration pin diameter	6-8 mm h7	Pin gauge vs nest bore
Pin position to tray edge	±0.1 mm	CMM or optical vs drawing
Cavity center pitch (X)	±0.2 mm cumulative	Grid scan all cavities
Cavity center pitch (Y)	±0.2 mm cumulative	Grid scan all cavities
Tray flatness	±0.3 mm	Granite plate + feeler
Tray thickness (flange to floor)	±0.2 mm	Depositor Z-stop reference

Semi-Auto Depositor Line Setup

Alignment is a system - tray, nest, nozzle manifold, and Z-stop must share one datum.

1. Datum corner - pick one tray corner as XY zero; pin holes reference from there.
2. Nest first article - shim nest until pins slide without bind; no force-fit.
3. Nozzle teach - teach cavity 1, corner cavity, and center cavity - verify grid, not just one cell.
4. Z-stop - nozzle tip 1-2 mm above cavity floor at deposit; tray thickness variation shifts Z.
5. Starch vs oil release - starch bed adds tray compression; account 0.5 mm Z offset.

Full gummy design context: gummy mold design guide. Gelatin vs pectin fill behavior: gelatin vs pectin.

Tray Registration Pin & Key Spec

Tray size	Pin count	Pin location	Key type
≤200 × 150 mm	2 pins	One long edge, 15 mm from corners	Round 6 mm
200-350 mm	3 pins	Two on long edge + one short	Round 8 mm
350 mm+	4 pins	All corners, 12 mm inset	Round 8 mm + dowel
Two-part gummy	+ registration keys	Cavity flange	3-5 mm keys - key spec

Cavity Center Grid & Pitch Tolerance

Depositor nozzle spacing is fixed - tray pitch error stacks across 12-24 cavities.

Cavities per row	Max cumulative pitch error	Typical depositor result
4	±0.15 mm	Clean center deposit
8	±0.20 mm	Acceptable - edge touch on outer cells if worse
12	±0.20 mm	Requires grid QC on sample approval
16+	±0.15 mm recommended	Stack error causes overflow on row 4+

Cavity volume must match deposit weight - cavity volume guide. Layout density: multi-cavity layout.

Deposit Weight vs Cavity Alignment

Off-center deposit still fills cavity but shifts meniscus - affects piece weight CV and release.

Misalignment	Fill effect	Release effect
0.5 mm off center	±0.3 g on 5 g piece	Minor - acceptable starch
1.0 mm off center	±0.8 g; flash at wall	Stick on demold row
1.5 mm+ off center	Overflow to neighbor cavity	Web tear risk on peel
Z too low	Splash; air trap	Nozzle fouling
Z too high	Meniscus dome; underfill	Weight CV >3%

Shore A 20-25 flexes under depositor clamp - over-torque nest bolts warp tray ±0.5 mm. Shore A for confectionery applies to gummy.

Production Spec at MOQ 50

PO line	Example
Depositor model	Semi-auto 12-nozzle - send nest drawing
Registration	2× 8 mm pins, 15 mm from corner datum
Cavity grid	4×3 × 22 mm pitch - ±0.2 mm cumulative
Shore A	22 ±2 - vacuum degassed, ~0.1% shrink
Walls / spacing	2.5 mm walls, 12 mm cavity spacing
Sample	1 tray + grid report in 3-7 days
Production	MOQ 50 after depositor FAI sign-off

Send depositor nest drawing, nozzle pitch, and target piece weight to [email protected] | Contact RUUIPON | WhatsApp +86 135 3006 2969.

Frequently Asked Questions

Can I run alignment without registration pins?
Visual nest only - expect 1-2 mm drift as silicone compresses. Pins are standard on MOQ 50 production trays.

Does ~0.1% shrink affect grid alignment?
On 300 mm tray, shrink is ~0.3 mm - we scale master to hit nominal pitch post-cure. Shrinkage tolerance.

Food-grade certification for gummy trays?
Platinum food-grade silicone; FDA/LFGB on request. FDA vs LFGB.

Prototype before MOQ 50?
Single tray with grid CMM report in 3-7 days - run depositor FAI before bulk.

Tray warped in shipping - alignment impact?
Reject if flatness >±0.3 mm. Shipping damage inspection.

Multiple tray designs on one depositor?
Each design needs pin position vs nest - send all drawings for DFM. DFM red flags.

MOQ for registered gummy trays?
MOQ 50 per cavity design - registration spec included at no extra tooling if on standard flange.