12″ X 18″ Lay Flat Poly Bags on Rolls 4 Mil 500/Roll

Parts Bagging Lay-Flat Poly Bags on Roll — 12×18 in., 4 mil

These 12×18 lay-flat poly bags on roll are designed for production line parts bagging, assembly staging, and industrial component protection where a heavy-duty, dispensed-from-roll format is required. At 4 mil, the film provides industrial-grade thickness for metal parts, hardware, gaskets, and sub-assemblies that would puncture or damage lighter gauges. The perforated roll format supports fast dispensing on active production lines without pre-counting or handling individual bags.

Specs: 12" x 18" | 4 mil | LDPE | 500/Roll | FDA/USDA Compliant

Applications

• Production line parts bagging for metal stampings, brackets, and hardware
• Automotive assembly component staging and kitting
• Flat PCB and circuit board sub-assembly protection
• Gaskets, shims, and precision flat part packaging
• Medical device component and instrument bagging

Features

• 4 mil industrial-grade thickness for heavy and sharp-edged parts
• Lay-flat (non-gusseted) format for flat and two-dimensional items
• Double bottom seal for superior strength under loaded conditions
• Perforations between bags for clean roll dispensing on pack lines
• Compatible with heat sealers for closed-end packaging
• 500 bags per roll, wound on 3" core with 1" diameter plug

Material Notes

Made from 100% virgin LDPE resin. At 4 mil, this film is classified as industrial-grade and is suitable for metal parts, abrasive hardware, and components that would penetrate lighter-gauge bags. LDPE is FDA/USDA compliant for applications requiring food contact documentation. The double bottom seal prevents seal failure under the weight of heavy metal components.

Use Case Notes

Lay-flat bags on roll are the standard format for automated or semi-automated parts bagging lines where a bag is pulled from the roll, loaded, and then heat sealed or tied before the next bag is dispensed. The 12×18 format accommodates most medium-size components: a standard PCB, a 4-bolt flange gasket, or a small automotive sub-assembly can all be bagged flat without folding. The 4 mil gauge handles the weight and edge profile of most metal industrial parts.

Common Questions

Q: What is the difference between lay-flat bags on roll and gusseted bags on roll?
A: Lay-flat bags on roll have no side expansion — they are completely flat on both sides. Gusseted bags on roll have folded side panels that open when loaded with bulky or three-dimensional items. Lay-flat bags are preferred for flat, rigid, or two-dimensional parts that load cleanly into a flat opening.

Q: Can these be used with heat sealing equipment?
A: Yes. The LDPE film is compatible with standard impulse heat sealers. For production line applications, the bag is dispensed from the roll, loaded, and heat sealed at the open end for a fully closed package.

Why Buy

For production and assembly operations that require consistent, fast parts bagging without manual bag handling, the 12×18 4 mil lay-flat roll bag is a proven format. The 4 mil gauge provides industrial durability, the double seal prevents load failures, and the 500-count roll length reduces change-over downtime on active manufacturing lines.