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For Coated Glass Processors handling Double or Triple Silver Low-E products, the most expensive cost isn't the glass itself, but the "Remake Rate." Coming off the Magnetron Sputtering Line, the silver layer is incredibly sensitive to oxidation and friction. Stacking these sheets on traditional A-frames creates "rub marks" that Automated Scanners inevitably reject. The Scratch-Free Harp Rack eliminates this risk by providing a "Touch-Less" storage environment, ensuring that high-performance coatings reach the IGU line with zero surface damage. |
The fundamental flaw of horizontal stacking or A-frame leaning for coated glass is contact pressure. Even with interleaving powder, the weight of the glass stack can press dust particles into the soft silver coating, creating pinholes.
Our Coating-Safe Trolleys utilize a "Zero-Contact" architecture. Each glass lite stands independently in its own slot, separated by an air gap. This means the sensitive coated surface (Air Side) touches nothing—not even a separator sheet. This isolation allows the coating to naturally passivate (stabilize) in the air without the risk of abrasion from adjacent sheets.
A Jumbo Coater runs continuously at high speed, while downstream cutting or tempering processes are often batch-oriented or slower. This speed mismatch requires a buffer.
Using high-density harp racks creates a mobile "Curing Buffer." Processors can offload the Coater rapidly into these racks and park them in a climate-controlled area. Because the racks allow airflow between sheets, the glass temperature equalizes faster than in a dense stack, reducing the thermal shock risk when the glass eventually enters the washer or furnace.
High-Density Buffering: Storing 50+ sheets of sensitive Low-E glass in a compact footprint without any surface contact.
When a defect is found by the Defect Detection System, the first question is: "Where did it happen?"
Harp racks serve as a traceable storage unit. By assigning specific rack numbers to specific coating batches (e.g., Batch #A203 in Rack #05), Quality Managers can physically isolate suspect batches. If scratches appear consistently on the bottom edge, the Numbered Slot System helps technicians identify if a specific slot or roller is damaged, allowing for targeted maintenance rather than shutting down the whole logistics line.
Not all plastics are safe for glass. Some cheap rubbers release volatile oils that can "ghost" onto the Low-E coating, creating invisible stains that only appear after tempering.
We use a proprietary Non-Outgassing PVC Formulation for our divider sleeves. This material is chemically inert and UV stabilized. It provides the necessary Shore Hardness to hold the glass securely while being soft enough to prevent micro-scratching. This attention to chemical detail ensures that the rack itself does not become a source of contamination.
Yes, but care must be taken. The glass leans against the sleeve on one side. For double-sided coatings, we recommend our specialized racks with minimal contact points or edge-only support designs.
In a high-volume coating plant, we recommend inspecting sleeves every 6 months. If embedded with glass chips, they should be rotated or replaced. Our KD design makes this replacement quick and cheap.
Our racks feature a slight 3-5 degree tilt angle. Gravity naturally keeps the glass resting firmly against the cushioned rods, preventing vibration or "chatter" even when moving over expansion joints.
Typically, glass exiting the coater is cool enough for PVC. However, if coming from a tempering line (hot), we recommend our high-temp Teflon-wrapped dividers instead of standard PVC.
Yes. For long-term storage of coated glass, we provide custom-fitted, breathable covers that protect the glass from shop dust while allowing moisture to escape.
