What is Coil To Coil No.4 Finished Grinding Line

A Coil-to-Coil No.4 Finished Grinding Line is a continuous stainless steel surface finishing line used to grind and brush stainless steel coils into a uniform No.4 satin brushed finish.

Unlike a sheet-to-sheet line, this machine processes the material in coil form. The stainless steel coil is first uncoiled, then passes through abrasive belt grinding and brushing sections. After finishing, the surface is cleaned, dried, optionally laminated with protective film, and then recoiled.

Product overview

The LEBON Coil-to-Coil No.4 Finished Grinding Line is designed for continuous surface grinding and brushing of stainless steel coils. It produces a fine, uniform and decorative No.4 satin brushed finish, widely used in decorative stainless steel, elevator panels, home appliance panels, kitchen equipment and architectural metal applications.

This production line is suitable for high-volume coil processing and is usually equipped with uncoiling, coil feeding, abrasive belt grinding, brushing, cleaning, drying, optional film laminating and recoiling systems. Compared with sheet-to-sheet processing, the coil-to-coil line provides higher production efficiency, continuous operation and more stable surface consistency for large-scale stainless steel finishing.

With adjustable grinding pressure, variable line speed, stable coil tension control and flexible abrasive belt selection, the line can meet different material thicknesses, working widths and surface finish requirements. It is an ideal solution for stainless steel service centers, decorative sheet manufacturers and metal processing factories that require efficient and reliable No.4 coil finishing production.

Key features

• Continuous coil-to-coil No.4 grinding and brushing production

• Produces fine, uniform and directional No.4 satin brushed finish

• Suitable for stainless steel coils of different grades, such as SS201, SS304 and SS316

• Automatic uncoiling and recoiling system for continuous large-volume production

• Stable coil tension control to keep material feeding smooth and flat

• High-speed abrasive belt grinding units for efficient surface processing

• Adjustable grinding pressure for different coil thicknesses and surface requirements

• Variable line speed for flexible production capacity and surface texture control

• Stable abrasive belt tracking system to prevent belt deviation and uneven brushing marks

• Multiple abrasive belt grit options for No.3 coarse grinding and No.4 fine brushing

• Wet grinding system available to reduce heat, dust and surface burning marks

• Grinding liquid filtration and recycling system for cleaner and more economical operation

• Cleaning and drying section to remove oil, dust, residue and water marks

• Optional protective film laminating system before recoiling

• PLC and inverter control system for easy operation and stable speed adjustment

• Heavy-duty machine frame for stable long-term continuous operation

• Customizable working width, coil thickness range, grinding heads and line layout

• Ideal for decorative stainless steel coils, elevator panels, appliance panels, kitchen equipment and architectural sheets

Working process 

Uncoiling Section

The stainless steel coil is loaded onto the uncoiler and opened automatically. The uncoiling system provides continuous material feeding for stable coil-to-coil production.

Coil Feeding and Tension Control

The coil is guided into the line through the feeding system. Stable tension control keeps the material flat and prevents slipping, deviation or uneven feeding during continuous processing.

Surface Grinding Section

High-speed abrasive belts grind the stainless steel surface to remove minor scratches, oxide marks and surface defects. Grinding pressure, abrasive belt grit and line speed can be adjusted according to the required surface finish.

No.4 Brushing Section

The brushing section creates a fine, uniform and directional No.4 satin texture on the coil surface. Stable belt tracking and controlled pressure help maintain straight grain direction and consistent surface quality.

Grinding Liquid or Dust Control Section

For wet-type lines, grinding liquid or coolant is supplied to reduce heat, control dust and prevent burning marks. For dry-type lines, a dust collection system can be added to improve the working environment.

Filtration and Recycling System

For wet grinding, used grinding liquid is collected, filtered and recycled for reuse. This helps reduce waste, lower operating cost and maintain stable grinding performance during long production runs.

Cleaning and Drying Section

After grinding and brushing, the coil surface is cleaned to remove oil, dust, grinding residue and metal particles. The drying unit removes moisture and helps prevent water marks on the finished surface.

Film Laminating Section

If required, a protective film is applied to the finished No.4 surface before recoiling. This protects the surface from scratches during recoiling, transportation, cutting and further processing.

Recoiling Section

The finished stainless steel coil is recoiled automatically after surface finishing. The final coil has a uniform No.4 satin brushed surface and is ready for storage, shipment or downstream sheet processing.

Applications

• Decorative stainless steel coil production

• Stainless steel service center processing

• Elevator panels and cabin interiors

• Home appliance panels

• Kitchen equipment materials

• Architectural wall and ceiling panels

• Interior decoration materials

• Stainless steel door and frame materials

• Metal furniture and display fixture panels

• Escalator side panels

• Commercial kitchen and restaurant equipment

• Appliance shell and cover panels

• Coil-to-sheet downstream processing

• Pre-treatment before coating, laminating or further fabrication

• Large-volume No.4 satin brushed stainless steel production

Quality Standard

• Finished coil should have a uniform No.4 satin brushed surface

• Grain direction should be straight, continuous and consistent along the coil length

• Surface texture should be even across the full coil width, from center to both edges

• Typical abrasive belt for No.4 finish: G180 or above

• No.3 coarse grinding can use abrasive grit around G60–G150

• Typical No.4 surface roughness reference: around Ra 0.4–0.8 μm, depending on material, belt grit, pressure and line speed

• Surface should be free from visible deep scratches, belt deviation marks, vibration marks and roller marks

• No burning marks, discoloration, oil stains, water marks or patchy areas on the finished surface

• Stable coil tension should be maintained to prevent slipping, wrinkles or uneven feeding

• Cleaning and drying section should remove grinding residue, oil, dust and moisture before recoiling

• Protective film, if applied, should be smooth with no bubbles, wrinkles or dust under the film

• Finished coil should be tightly and evenly recoiled without edge damage or surface scratching

• Quality inspection should include visual checking, grain direction checking, surface roughness testing and comparison with approved customer sample

Short description

LEBON Coil-to-Coil No.4 Finished Grinding Line is designed for continuous grinding and brushing of stainless steel coils to produce a uniform No.4 satin brushed finish. With automatic uncoiling, stable tension control, abrasive belt grinding, cleaning, drying, optional film laminating and recoiling systems, it is ideal for large-volume decorative stainless steel coil production, elevator panels, appliance panels, kitchen equipment and architectural metal applications.