High-Volume Batch Processing Workflow

Batch Criteria

• Same Garment Type: All 11oz mugs, all medium t-shirts, etc. Different sizes = different setup time.
• Similar Color: Group light designs together, dark designs together. Changing curing temperature adds setup time.
• Related Process: All pretreatment, all DTG print, all heat-press cure. Don't mix process stages.
• Common Tools: All designs using same template or setup reduce retooling.

Batch Sizing Strategy

• Small Batches (5–10 units): For custom or rush orders. Setup time is significant fraction of total production time.
• Medium Batches (20–50 units): Most efficient for small shops (1–2 presses). Setup overhead amortized well.
• Large Batches (100+ units): Ideal for high-volume production. Setup time becomes negligible per unit.
• Queue Optimization: Plan 2–3 batches per day so setup time is only 15–20% of total.

1. Sort and Stage Work

• Collect all garments for the batch; count and verify quantity.
• Arrange by color if possible (light → medium → dark).
• Lay out all design files on desktop; verify all are production-ready.
• Pre-heat press and curing station 20–30 minutes before start.

2. Configure Machines

• For DTG: Load garment size and pretreatment settings; test print on scrap garment.
• For Screen Printing: Mount screen; adjust squeegee pressure; flood pass to verify ink flow.
• For Heat Press: Set temperature, pressure, and dwell time; verify with test garment.
• Document Settings: Write down all parameters on production sheet for consistency.

3. Prepare Materials

• DTG: Load paper into pretreatment sprayer; fill ink reservoirs if running low.
• Screen Printing: Mix ink to correct viscosity; add to screen coating station.
• Heat Press: Lay out blank garments near press in sequential order.

**Phase 1: Pretreatment** (if DTG)

1. Load first 10 garments into spray booth.
2. Spray evenly; send through conveyor dryer.
3. Stack treated garments on cart; keep warm.
4. Repeat until all garments treated.

**Phase 2: Printing**

1. Load first pretreated garment onto print bed.
2. Print design; verify print position and quality.
3. If acceptable, continue with remaining garments.
4. Queue printed garments for curing.

**Phase 3: Curing**

1. Transfer printed garments to heat press or curing conveyor immediately.
2. Cure per specification.
3. Remove and cool on rack.
4. Stack onto final pallet.

**Phase 4: Quality Check and Packaging**

1. Inspect every 10th garment; check color, registration, and adhesion.
2. Fold and bag completed garments.
3. Label with order number and date.
4. Stage for shipping.

Production Rate = Total garments completed / Total time (including setup)

• Target: 10–20 units/hour for small shops; 30–50+ for industrial automation
• Track by batch to identify bottlenecks

Setup Time % = Setup time / (Setup + Production time) × 100

• Ideal: 15–20% for batches of 20+ units
• Above 30%: Batch too small or process too complex; combine with next batch

Quality Rate = Accepted units / Total units completed × 100

• Target: > 95%
• Below 95%: Investigate curing, pretreatment, or machine calibration issues

Utilization Rate = Productive time / Available shift time × 100

• Target: 70–80% (includes break time, setup, QC)
• Below 70%: Machine idle time or scheduling inefficiency

For Print-and-Cut (Sublimation, UV DTF)

• Arrange designs on film/paper to minimize waste
• Rotate small designs to fill gaps
• Target: < 10% waste per sheet

For Screen Printing

• Use half-screens for small designs
• Nest multiple small designs on one screen
• One-color designs on shared screens to save screen inventory

For DTG on Garments

• Position design 3–4 inches from collar and sleeves
• Consistent placement across batch for smooth operation

Daily Schedule Example (3 batches, 8-hour shift)

• 7:00–7:30 AM: Setup; warm machines
• 7:30–9:00 AM: Batch 1 (30 units of design A)
• 9:00–9:30 AM: Setup Batch 2
• 9:30–11:00 AM: Batch 2 (25 units of design B)
• 11:00–11:15 AM: Lunch + Setup Batch 3
• 11:15–1:00 PM: Batch 3 (40 units of design C)
• 1:00–3:00 PM: QC and packaging; prep tomorrow's batches
• 3:00–5:00 PM: Shift end; cool and clean machines

Capacity Planning

• Identify your bottleneck (usually heat press or printer)
• Schedule batches to keep bottleneck machine busy 70–80% of shift
• Use secondary equipment (second heat press, second printer) to run parallel batches

Inconsistent Results Between Batches: Different operators, curing temperatures, or settings. Document all parameters; enforce consistency through checklists.

Batch Larger Than Needed: Order smaller batches to test before committing to full run. Reduces risk of high-volume defects.

Too Many Setups: Batch too small. Group with nearby batches or reschedule for higher efficiency.

Machine Downtime During Batch: Inadequate pre-production checks. Test print before loading full batch.