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IGU production workflow · Glass WIP buffer
Turn pre-assembly searching into controlled kitting: sort single sheets into numbered slots, hold the intended pair together, and move the WIP batch to the IGU line as one organized unit.
In an IGU plant, the pairing problem usually starts before the sealing table. Two single lites belonging to one unit may leave cutting or edging at different times, take different routes through washing or tempering, or be released into the staging area in a mixed sequence. The result is familiar to a planning supervisor: one lite reaches the assembly station while its mate is still somewhere in a floor rack, a second batch is parked in front of the first, and operators spend time looking for glass instead of building units.
Hrack is best understood as a production-flow device, not a warehouse A-frame. It creates a visible WIP buffer between processes. A slot can represent an order, unit number, size family, or pairing position. When the matching lites are ready, they can be placed into the planned slots, checked as a group, and pushed to the IGU line together. That does not remove upstream variation; it makes the variation visible and manageable before it interrupts the assembly station.
Why IGU pairs fall out of sequence
Pairing breaks down when the physical flow follows arrival time but the IGU line follows production order. A lite may be delayed by rework, edge processing, coating identification, washing, or a downstream quality hold. If all sheets are leaned together without a fixed location, the next operator must identify them by memory, labels, or repeated handling. That creates three operating risks: a mate is overlooked, mixed orders occupy valuable floor space, and unnecessary movement increases the chance of edge contact or coating friction. A numbered slot index gives the team a shared physical reference. It is not an automated traceability system, but it provides a simple location convention that can support the plant’s traveler, barcode, or dispatch list.
How Hrack supports kitting before the assembly table
Use the rack as a simple four-step node. First, assign a slot or slot group before the first lite leaves the preceding process. Second, place each single sheet into its designated position and record its order or unit reference. Third, bring the matching lite into the adjacent planned position, rather than creating a new mixed pile. Fourth, release the completed kit to the IGU line when the pair and its process status are both ready. The mobile base lets the team move a prepared group across the plant; the foot-operated floor lock is then engaged to lift the load off the casters and stabilize the rack during loading, checking, or handoff. Bottom nylon roller shafts can support guided positioning, while a full slotted base is an alternative for short or irregular glass. PVC- or PVB-sleeved steel-wire dividers and an EPDM backrest help keep glass away from hard steel contact, but they do not replace safe handling, edge protection, or the plant’s own quality controls.
Why slot width and rack width must be specified together
A narrow slot is not automatically better. Slot width must allow the actual lite thickness, coating or spacer condition, operator insertion method, and any protective separation required by the process. Wide slots give more clearance but can let thin glass shake; tight slots improve location density but leave less tolerance for variation and handling. Hrack configurations commonly use project-specific spacing such as 8–10 mm, 12 mm, 14 mm, 14.3 mm, or 25 mm. These are examples, not one universal specification. Rack width also changes the kitting decision: a wide, high-density model may provide roughly 40–50 slots or more, while a narrow model may fit better beside a constrained IGU line. Select from actual glass thickness ranges, pair mix, aisle width, turning space, and peak WIP—not from nominal capacity alone.
Should a lower-volume IGU plant use Hrack?
- Use Hrack when pairing delays, mixed orders, or floor congestion repeatedly interrupt the assembly sequence. A small plant can benefit from one narrow rack if it creates a reliable staging point without consuming the aisle.
- Choose a narrow, lower-density configuration when the product mix is limited and space is the constraint. Choose a wider or higher-slot configuration when many orders wait between cutting and IGU assembly; confirm the usable slot count from the actual layout.
- Choose tighter slots only after checking the thinnest lite, coating, handling clearance, and separator material. For short, shaped, or irregular glass, evaluate the full slotted base option rather than forcing every piece onto a roller support.
- Do not use Hrack as a substitute for a long-term storage system, automated identification, or an oversized load rating. Confirm project-specific dimensions, load, caster, lock, and finish requirements before ordering; return to the Hrack PDP-04 and PDP-05 paths for product and configuration review.