Steel & Metallurgy Rubber Rollers
Rubber rollers for metal strip contact, heavy industrial conveying, pressure, support, and surface protection positions.
Stainless Steel Pickling Line Segmented Roller Case
The Problem
A stainless steel strip pickling line needed replacement transport rollers for the spray pickling section inside the acid tanks.
These were not ordinary conveyor rollers. The rollers worked inside the pickling tank, supported stainless steel strip, and stayed exposed to mixed acid, acid mist, rinse water, wet strip contact, and repeated pressure from the moving strip.
The site condition included approximately 40% nitric acid and 10% hydrofluoric acid exposure. Around 80 rollers were involved. The original roller source was no longer available, so the plant needed a replacement direction that could match the existing equipment layout without changing the tank structure or roller mounting arrangement.
The roller structure was also important. It was not a continuous full-face rubber cover. The working surface was divided into repeated segmented bands across the roller face, with each band supporting the strip and the spaces between sections allowing acid and rinse liquid to move through the tank area.
Roller Details / Project Details
The replacement rollers were made around the original stainless steel strip pickling line layout.
Roller type: segmented rubber-covered transport roller
Application: stainless steel strip spray pickling line
Working position: inside the acid pickling tank
Quantity: around 80 rollers
Total roller length: approximately 3200 mm
Rubber-covered face length: approximately 2780 mm
Roller diameter: approximately 270 mm
Working section width: approximately 120 mm per segment
Spacing / intermediate section width: approximately 110 mm
Contact material: stainless steel strip
Contact medium: nitric acid, hydrofluoric acid, acid mist, rinse water, and wet strip contact
Site acid direction: approximately 40% HNO₃ and 10% HF exposure
Main requirement: chemical-resistant segmented cover, protected end faces, sealed edges, stable bonding, and direct replacement compatibility
The size had to stay close to the original roller because the installation space, tank layout, and strip path were already fixed. The real work was in the cover construction: each segmented band created side edges, and those edges had to be protected against acid penetration.
How the Segmented Cover Was Handled
The segmented cover was kept because it matched the way the roller worked inside the pickling tank.
A full continuous rubber surface would create a larger contact area against the stainless steel strip. In a wet acid tank, that can increase liquid retention, surface drag, and full-face chemical exposure. The segmented layout gives the strip repeated support points while leaving space between sections for acid and rinse liquid movement.
For this roller, the segmented structure helped keep the replacement close to the original line design. It also made each working band more controllable during finishing. The difficult part was that every segment created two side faces. If those side faces were left as simple cut edges, acid could enter from the side and reach the bonding layer.
So the segmented cover was not treated as a visual shape only. The rubber compound, side-face protection, edge transition, and bonding system had to work together.
Cover Material, End Faces, and Bonding
The replacement direction used a proprietary chemical-resistant rubber compound selected for nitric acid and hydrofluoric acid exposure. It was not handled as standard EPDM, standard CSM, Hypalon, or a general-purpose rubber cover.
The working surface had to support wet stainless steel strip, so the rubber cover still needed suitable hardness and surface stability. At the same time, the side faces and end faces needed protection because acid splash and wet carryover can attack areas outside the main running surface.
For acid tank rollers, failure does not always start from the center of the roller face. It can start from a segment edge, an end face, or a rubber-to-core transition area. Once acid reaches the bonding layer, the cover may begin to lift, soften near the edge, or lose adhesion over time.
That is why the roller was handled as a complete chemical-contact structure, not just a rubber material change. The cover, edges, end faces, and bonding preparation were all part of the same specification.
Manufacturing Notes
For a 3.2 m segmented roller used in this environment, repeatability mattered. The project involved around 80 rollers, so the cover layout, segment spacing, edge treatment, and finished diameter had to stay consistent from roller to roller.
The manufacturing focus was on the steel core condition, surface preparation before bonding, rubber build-up across the covered face, segment edge control, and finished surface condition. The side faces could not be left as open, rough edges where acid could collect. The exposed transition areas also needed to avoid unnecessary liquid traps.
This kind of roller may look like a transport roller, but it cannot be manufactured like a normal dry-contact conveyor roller. In the acid tank, every exposed edge can become part of the working condition.
Practical Notes for Similar Pickling Line Rollers
For stainless steel pickling lines, replacement rollers should not be judged only by diameter, length, and a rubber material name.
The important details are often the ones around the cover: whether the segmented structure matches the strip path, whether acid can move between sections, whether the side faces are protected, whether the end faces are sealed, and whether the bonding system can handle wet acid exposure.
A roller that fits the machine may still fail if the acid tank environment is not considered. For this type of application, the replacement has to be treated as a segmented chemical-contact transport roller.
Information That Helps Similar Projects
For similar pickling line roller projects, the first discussion does not need to start with complete drawings. Useful information includes:
- photos of the old rollers from the top and both ends
- total roller length, covered face length, diameter, and shaft details
- width of each working segment and spacing between segments
- roller position inside the acid tank, spray section, rinse section, or conveying section
- acid type and approximate concentration
- whether the roller directly supports stainless steel strip
- quantity of rollers
- old material direction if known
- photos showing side faces, end faces, edge damage, or bonding areas
- drawings or old roller samples if available
For segmented pickling line rollers, photos of the segment edges and end faces are especially useful.
Need to Review a Similar Pickling Line Roller?
If your stainless steel strip line needs replacement rubber rollers for acid tank, spray pickling, rinse, or wet conveying positions, you can send us old roller photos, dimensions, segment layout, roller position, acid contact direction, and quantity.
If drawings or complete specifications are not ready yet, the project can still start from the roller position, contact medium, photos, and the replacement problem you need to solve.