Colorful Shrink-Film Temperature & Tunnel Speed Guide :root { –primary: #2a9d8f; –secondary: #e9c46a; –accent: #f4a261; –dark: #264653; –light: #f0efeb; –card-bg: #ffffff; –card-border: #ddd; } body { background: var(–light); font-family: ‘Segoe UI’, Tahoma, Geneva, Verdana, sans-serif; color: var(–dark); margin: 0; padding: 0 1rem; max-width: 900px; margin-left: auto; margin-right: auto; } header { background: var(–primary); color: #fff; padding: 2rem 1rem; border-radius: 0 0 8px 8px; text-align: center; } header h1 { margin: 0 0 0.5rem; font-size: 2rem; } header p.intro { margin: 0; font-size: 1.1rem; opacity: 0.9; } section { margin: 2rem 0; background: #fff; border-radius: 8px; padding: 1.5rem; box-shadow: 0 2px 6px rgba(0,0,0,0.05); } section h2 { color: var(–secondary); text-align: center; margin-top: 0; } /* Temperature Range Infographic */ #temp-chart { display: block; margin: 1.5rem auto; max-width: 100%; height: auto; } #temp-chart rect { rx: 4; ry: 4; } /* Card Grid */ .card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; } .card { background: var(–card-bg); border: 1px solid var(–card-border); border-radius: 8px; padding: 1rem; transition: transform 0.2s; } .card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); } .card h3 { margin-top: 0; color: var(–accent); } .card p { margin: 0.5rem 0; } .gauge { font-weight: bold; color: var(–primary); } .temp { font-weight: bold; color: var(–secondary); } /* Best Practices */ ul.best-practices { list-style: none; padding: 0; } ul.best-practices li { margin: 0.75rem 0; padding-left: 1.5rem; position: relative; font-size: 1rem; } ul.best-practices li:before { content: “✔”; position: absolute; left: 0; color: var(–accent); font-weight: bold; } footer { text-align: center; font-size: 0.9rem; color: var(–dark); margin: 3rem 0; }

Ultimate Guide to Shrink-Film Temperature & Tunnel Speed

Match your film type and product weight to the ideal tunnel settings for crisp, professional shrink packages.

Common Shrink-Film Types

PVC (Polyvinyl Chloride)

Temperature Range: 93–121°C

• Low shrink temperature—ideal for small tunnels or heat guns.

• Excellent clarity and gloss for retail packaging.

• Not recommended for food contact in some regions.

POF (Polyolefin)

Temperature Range: 135–163°C

• Strong, puncture-resistant, and food-safe.

• Clean-shrink variants reduce webbing.

• Widely used in automated tunnel systems.

PE (Polyethylene)

Temperature Range: ~127°C

• Soft, flexible—good for odd shapes.

• Moderate clarity, often used for bundling.

• Economical option for heavy-duty applications.

Shrink-Film Temperature Ranges

25°C 50°C 100°C 150°C 200°C 250°C 300°C 350°C PVC (93–121°C) PE (127°C) POF (135–163°C)

Recommended Settings by Product Weight

Up to 0.5 kg

Film Type: POF (Clean-Shrink)

Gauge: 10–20 μm

Temp: 121–143°C

Belt Speed: 4.5–7.5 m/min

Fast dwell; minimal airflow to avoid flutter.

0.5–2 kg

Film Type: POF (Standard)

Gauge: 20–30 μm

Temp: 135–157°C

Belt Speed: 3.6–6.0 m/min

Moderate airflow; monitor bottom-up shrink.

2–5 kg

Film Type: PE (Bundling)

Gauge: 30–50 μm

Temp: 127–149°C

Belt Speed: 2.4–4.5 m/min

Use crossflow for even heat distribution.

5–10 kg

Film Type: PE (Heavy-Duty)

Gauge: 50–75 μm

Temp: 138–160°C

Belt Speed: 1.8–3.6 m/min

Increase dwell; boost mid-zone airflow.

Over 10 kg

Film Type: POF (Cross-Linked)

Gauge: 50–75 μm

Temp: 149–171°C

Belt Speed: 1.2–3.0 m/min

Highest temp; ensure strong seals on large loads.

Tunnel Adjustment Best Practices

• Use multi-zone control (preheat, shrink, cooling) for gentle ramp-up and shape lock-in.
• Manage airflow direction (bottom-up vs. crossflow) to suit product shape.
• Start belt speed slightly slow—then increase until you see under-shrink, then back off.
• Thicker films need higher temps or slower belt speeds; thin films need lower temps to prevent burn.
• For heat-sensitive items, reduce temp by 10–15°C and slow the belt to increase dwell.