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Glass Processing Workflow Guide
A Hrack, also called a Glass Harp Rack or Harp Rack Glass Trolley, helps glass fabricators separate, stage, and move individual sheets between production processes.
Glass processing plants often need more than a static storage rack. After cutting, sheets may need to be sorted by order, paired for IGU production, or held temporarily before edging, washing, tempering, laminating, or assembly. A Hrack creates a mobile, high-density WIP buffer that keeps individual sheets organized while reducing unnecessary handling.
Its value is especially clear with thin, short, narrow, coated, or irregular glass. PVC or PVB sleeves around the steel-core dividers help reduce direct glass-to-metal contact, while the selected bottom support route provides either rolling entry or more continuous support. The result is a rack designed for production flow rather than long-term bulk storage.
Hrack Is a Flow Rack, Not a Conventional A-Frame
An A-frame is generally used for holding larger groups of glass in a relatively static storage position. A Hrack serves a different purpose: it separates single sheets into numbered slots so operators can sort mixed orders, stage paired sheets, and retrieve units without repeatedly rebuilding a stack. This makes it useful at cutting output, between fabrication processes, and near IGU assembly lines.
For high-mix or non-standard production, the rack can act as a plant-floor logistics node. Operators can move sheets between workstations, keep orders in sequence, and create temporary WIP capacity without placing glass directly on the floor or combining different jobs in one stack.
Choose the Bottom Support and Slot Spacing for the Glass
Hrack projects commonly use one of two bottom support routes. Nylon roller supports make it easier to push conventional sheets into position and are suitable for short-distance movement. A full slotted base provides more continuous support for short-edge, narrow, triangular, trapezoidal, and other irregular shapes that may be less stable across open roller gaps.
Slot spacing must be selected with the glass range and handling method in mind. Source projects show configurations including 8–10 mm, 12 mm, 14 mm, 14.3 mm, and 25 mm spacing. Narrower spacing can help control thinner sheets, while thicker glass may require a wider slot. These values are project-specific and should be confirmed against the glass thickness, maximum sheet size, loading method, and required capacity rather than treated as one universal standard.
Locking, Protection, and Flat-Pack Transport Support Daily Operations
A foot-operated floor lock can lift the casters away from the floor so the rack bears on its feet while parked. This active locking method is useful when operators need to load or unload glass without relying only on a wheel brake. Heavy-duty polyurethane or nylon casters are available in project-specific sizes, including observed 5-inch, 6-inch, 8-inch, and 10-inch configurations.
The protection package may include EPDM backrest padding, rubber buffer strips, top nylon strips, and PVC or PVB divider sleeves to help reduce edge impact, surface contact, and vibration-related damage. The bolted, knock-down structure also supports flat-pack export shipping and on-site assembly. Because dimensions, slot counts, load ratings, caster configurations, and base types vary by project, the final layout should be reviewed against the customer’s drawing or RFQ before release.
What to Confirm Before Specifying a Hrack
- What are the maximum and minimum glass dimensions, and what thickness range must each rack accommodate?
- How many sheets should each rack hold, and what single-slot or total load requirement applies to the actual glass mix?
- Would nylon roller supports or a full slotted base provide better stability for the customer’s short, narrow, or irregular sheets?
- Will the rack be moved between workstations, handled with a forklift, or mainly parked in one area, and what finish or color is required?