How an Automated Coil Packing Line Works, From Infeed to Dispatch

Steel and aluminium coils leaving a slitting line, cold rolling mill or intermediate storage need protection during handling, storage and transport. An automated coil packing line brings measurement, moisture protection, mechanical protection, strapping, labelling and weighing together in a controlled process. This article follows a coil from infeed to dispatch and explains how the packing code and line configuration determine the steps used for each product.

Whether you are specifying a new line or upgrading manual packing, understanding the order of these steps helps you define the required package, capacity and connections to your mill.

What an Automated Coil Packing Line Is

An automated coil packing line is an integrated system that checks each coil, applies the protection specified by its packing code and prepares the finished package for dispatch. The code determines which materials and stations are used. A coil intended for demanding transport may need through-eye wrapping, body protection, headers and additional edge protection; another product may need a lighter package.

A manual packing operation can involve 10–14 operators working close to heavy coils and handling equipment. Pesmel’s fully automated lines follow a no-man-on-the-floor approach during operation: typically one or two people supervise the system and replenish materials as needed. Automation also cuts packing materials to suit each coil’s dimensions, reducing the need to keep multiple pre-cut sizes in stock. Depending on the packing method and product mix, automated packing can reduce material costs by around 30%. See how Pesmel’s coil packing technology limits rust and material waste.

The Line, Station by Station

A packing code controls the protection applied to each coil. The sequence below shows the principal stages of a line with through-eye wrapping and mechanical protection; the exact equipment and packing code are specified for each mill.

Infeed, Coil Measurement, Eye Checking and Weighing

The coil arrives from production, a slitter or an intermediate storage area. At infeed, the line checks its dimensions and profile, confirms that the eye is clear for the through-eye wrapping equipment and records its weight. These checks also help verify that the physical coil matches its identification and assigned packing code. Dimensions guide the cutting of protection materials to size, while the weight forms part of the coil’s product and commercial record.

If a protruding strip end or another obstruction is detected in the eye, the coil can be stopped for attention before it reaches the wrapping machine. Coil cars transfer the coil between the packing stations.

Initial Inner Edge Protection

Where the packing code calls for it, the line fits inner corner protectors before through-eye wrapping. They protect the coil’s inner edges where the wrapping material passes through the eye and where the package may be exposed to handling contact. This first layer is distinct from the additional inner and outer edge protection that may be applied later in the line.

Through-Eye Wrapping and Outer Edge Protection

Through-eye wrapping (TEW) takes place before body wrapping. The wrapping carriage passes through the coil eye as the coil rotates, applying PE stretch film around the coil. A crepe paper layer can be applied beneath the film to absorb moisture within the package; where the conditions call for it, the paper can also be treated with a volatile corrosion inhibitor (VCI). The stretched film creates a close seal against external humidity. With the appropriate packing materials and conditions, this protection can remain airtight for more than two years.

Outer corner protection can also be placed beneath the crepe paper and PE film during this stage. It reinforces the outer edges without replacing the later mechanical protection specified by a heavier packing code. Read more about how TEW protects coils against moisture and corrosion.

Body Wrapping

After TEW, body wrapping adds mechanical protection to the coil’s outer circumference and, where required, its inner surface. Depending on the packing code, the material can include steel, plastic or protective board. The selected layers help shield the finished coil from scratches and other handling damage. The material and amount of coverage are set for the product and its intended transport conditions.

Headers and Additional Inner and Outer Edge Protection

Headers cover the coil’s flat side faces. Further inner and outer edge protectors then reinforce the exposed corners and hold the protection around the coil’s profile. On a heavier packing code, these later protectors can be made of steel; other codes use plastic or board according to the protection required. The initial inner protectors, the outer protection integrated with TEW and these later inner and outer protectors therefore have different positions and purposes in the package.

Pesmel’s Hyundai Steel packing-line description shows how TEW, body wrapping, headers and separate edge-protection stages can be combined in one automated installation.

Strapping, Labelling and Final Weighing

Automatic strapping secures the specified layers and protectors in place. The packing code sets the number, material and positions of the radial or circumferential straps. The line then applies identification labels with the coil and order details required by the mill and its customer. A final weight check records the completed package. The finished coil is then ready for handover to storage or dispatch equipment.

The table summarises the role of each stage. Some configurations combine functions in one station or omit stages that a particular packing code does not require.

Stage	What it does	Why it matters
Infeed, measurement, eye check and weighing	Checks coil dimensions, eye clearance, identity and incoming weight	Confirms the correct coil and supplies data for the packing code and material sizing
Initial inner edge protection	Fits inner corner protectors before TEW, where required	Protects the inner edges during wrapping and subsequent handling
Through-eye wrapping and outer edge protection	Wraps the eye with PE film, optionally over crepe paper; may add outer corner protection beneath the wrap	Limits exposure to external humidity and reinforces the outer edges
Body wrapping	Applies the specified steel, plastic or protective board to the coil body	Protects the body surface against handling damage
Headers and additional edge protection	Covers the side faces and adds further inner and outer protectors as specified	Strengthens the mechanical protection of faces and corners
Strapping, labelling and final weighing	Secures the package, identifies it and records its finished weight	Prepares a traceable package for storage and dispatch

What Determines Throughput on a Coil Packing Line?

Pesmel reports that its TEW equipment can wrap approximately 20 normal-sized coils in an hour. That figure describes a wrapping operation, not a guaranteed output for every complete packing line. The line’s sustained capacity is specified for the customer’s actual packing codes, coil dimensions, station cycle times and operating conditions. For a broader guide, see how to measure coil packing capacity. The Chalco aluminium project shows how a specific line was designed around its own capacity and availability requirements.

Each added protection stage takes time. A code with crepe paper and PE film, body wrapping, headers, additional edge protectors and several straps will have different station times from a lighter code. The line must also move coils between stations at a pace that keeps the longest cycle from causing avoidable delays. Pesmel’s Automatic Film Roll Changing (ARC) can reduce interruptions when a film roll runs out; other packing materials still need replenishment according to the equipment and production schedule.

For a useful capacity specification, state the required number of fully packed, accepted coils per hour, the share of production using each packing code and the assumptions about availability and replenishment. We can then assess the line configuration against your production requirements.

How the Line Connects to Mill Operations

A coil packing line works between production or storage upstream and storage or dispatch downstream. When connected to the mill’s tracking and control systems, it can use coil identity and order data to select the assigned packing code and print the correct label. Its measurements and final package weight can also be recorded against that coil’s identity.

Pesmel’s integrated controls can be accessed from standard PCs, with a multilingual HMI for monitoring packing-line performance. The data exchange, reporting and downstream handover are defined for each project. Connecting packing with the wider metal industry material flow helps the mill keep the right coil, packing instructions and dispatch information together.

Operator Safety and Packing Consistency

Automated handling and packing keep operators away from the coil and moving equipment during normal production. Personnel still need controlled access for tasks such as material replenishment and maintenance, so the safety arrangements must suit the final line layout. The line also applies the selected packing code consistently, avoiding variations in material placement that can occur during manual work.

Materials can be selected with recyclability in mind alongside the mechanical and moisture protection required by the customer. For an example of an installation combining TEW, outer edge protection, strapping and labelling, see Pesmel’s Novelis coil packing project.

Specify a Coil Packing Line With Pesmel

With more than 40 years of experience and over 400 deliveries across our metal industry solutions, we design packing equipment around each mill’s coil dimensions, packing codes, protection requirements, available space and target output. We can combine the required stations with the coil-car transport and controls needed for the installation. You can explore further Pesmel project references to see different configurations in use.

Tell us which coils you pack, how they are handled and shipped, and what sustained capacity you need. Contact the Pesmel team to discuss a line specification for your operation.