Glass Handling and Cullet Conveyor Systems
Glass manufacturing creates a material handling problem unlike anything else in industrial production. The product is heavy, fragile, abrasive when broken, and dangerous to handle manually. Waste glass — cullet — needs to be collected from every cutting station, breakout table, and quality rejection point in the facility, broken to a consistent size, and conveyed to storage or recycling without exposing operators to the injury risks that come with handling broken glass by hand.
Custom Conveyor & Equipment Corporation has been engineering conveyor systems for glass fabrication plants for over 40 years. This is one of the industries where we’ve built the deepest expertise — from simple above-floor cullet removal systems serving a single cutting table to complex, plant-wide networks of below-grade conveyors collecting waste from dozens of stations and delivering it to centralized processing. We know glass, we know the equipment that handles it, and we understand the operational realities of facilities where glass handling is a daily concern.
The Cullet Problem
Every flat glass fabrication facility generates waste glass. Cutting operations produce edge trim and offcuts. Breakout stations generate scrap from scored panes. Quality inspection rejects whole lites that don’t meet specifications. Tempering and laminating processes produce breakage. This waste glass needs to go somewhere, and how it gets there has a direct impact on operator safety, production efficiency, and facility cleanliness.
The traditional approach — operators manually collecting broken glass, loading it into bins, and moving bins with forklifts — is slow, labor-intensive, and one of the leading sources of hand and arm injuries in glass plants. Broken glass edges are unpredictable. Even with protective equipment, manual cullet handling exposes workers to cuts, punctures, and the ergonomic strain of handling heavy, awkward loads repeatedly throughout a shift.
Automated cullet handling eliminates most of that exposure. Glass goes into the system at the point where it’s generated and arrives at the collection point without human hands touching it. That’s the core function our cullet systems provide.
How Our Cullet Systems Work
Glass Breakers
Before waste glass can be efficiently conveyed, it needs to be reduced to a consistent size. Whole lites and large offcuts won’t travel on belt conveyors — they bridge across the belt width, jam at transitions, and damage conveyor components. Our glass breaker units reduce incoming glass to cullet sized for reliable belt conveyor transport. The breaker rollers are designed for the glass types and thicknesses your facility processes, whether that’s single-strength residential glass, heavy commercial plate, or laminated architectural glass that requires more aggressive breaking force.
Breaker roller wear is an expected maintenance item in cullet systems. We design our breaker assemblies for straightforward roller replacement — your maintenance team can swap rollers during scheduled downtime without disassembling the entire breaker housing. We also supply replacement breaker rollers for ongoing maintenance, so you’re not sourcing wear parts from a third party who doesn’t know how our systems are built.
Below-Grade Trench Systems
For facilities with multiple cutting lines and breakout stations spread across a large floor area, below-grade trench conveyor systems provide the most efficient cullet collection. Trenches run beneath the production floor, with drop points at each station where waste glass falls directly onto the conveyor below. The conveyor transports cullet through the trench to a central collection point — typically an inclined conveyor that elevates cullet into a roll-off container or storage bin outside the building.
Trench system design requires careful coordination with your facility’s structural engineering. Trench depth, width, cover grating specifications, and drainage all need to be resolved during the design phase. We provide the engineering data your structural team needs and coordinate with them on interface details. The trench is permanent infrastructure — getting it right during construction avoids the expensive modifications that result from discovering problems after the floor is poured.
Above-Floor Systems
Not every facility can accommodate below-grade trenches — existing buildings with slab-on-grade construction, landlord restrictions, or budget constraints may require above-floor cullet handling. Our above-floor systems use enclosed belt conveyors positioned at floor level adjacent to cutting tables, with loading points designed for the glass sizes and volumes each station generates. Elevated conveyors carry cullet from the production floor to external collection points, with transition sections that handle the elevation change from floor level to container loading height.
Above-floor systems require more floor space than trench installations, and they present different access and traffic flow considerations. We design routing that minimizes interference with production traffic and forklift paths while keeping the conveyor accessible for maintenance and cleaning.
Multi-Line Collection Networks
Large glass fabrication plants with multiple production lines need cullet collection systems that gather waste from every source and consolidate it efficiently. Our multi-line systems use trunk and branch conveyor layouts — individual branch conveyors collect cullet from each production line or station group and feed into a main trunk conveyor that transports the combined stream to central collection. Merge points between branches and the trunk are designed to handle the peak cullet generation from each branch without creating the jams that occur when merge capacity is undersized.
Beyond Cullet — Finished Glass Handling
While cullet handling is our most recognized capability in the glass industry, we also engineer conveyors for moving finished glass products through fabrication processes. Flat glass handling demands non-marking contact surfaces, stable support that prevents deflection and breakage, and gentle transitions between conveyor sections.
Our finished glass conveyors use felt-covered rollers, UHMW polyethylene support surfaces, and padded guides that transport glass panes without surface marks or edge damage. Speed-matched transitions between conveyor sections prevent the impacts that occur when a pane crosses from one conveyor to another running at a different speed. Accumulation sections buffer glass between operations without stacking or surface-to-surface contact that creates scratches.
Window and Door Component Handling
The window and door segment of the glass industry involves handling vinyl and wood frame components alongside glass units. These components require gentle, non-marking conveyance to protect finished surfaces. Our conveyors for window and door fabrication use soft belt surfaces and padded guides that handle painted, stained, and vinyl-wrapped profiles without marring. Assembly line conveyors move window and door units between glazing, hardware installation, and inspection stations at controlled speeds that match operator work pace.
What 40 Years of Glass Industry Experience Means for Your Project
We’ve designed cullet systems for plants processing every type of flat glass — residential, commercial, architectural, automotive, and specialty applications. That depth of experience shows up in details that matter:
We know which belt materials last longest against the abrasion of broken glass and which ones wear through in months. We know where cullet accumulation problems occur in trench systems and how to design transitions that prevent bridging. We know the loading patterns that cause belt mistracking in cullet applications and how to engineer tracking systems that handle them. We know what breaks and when — so we design maintenance access that makes the predictable service items easy to reach and fast to replace.
This isn’t knowledge we acquired from a textbook or a trade show. It comes from decades of building, installing, and supporting glass handling equipment in operating plants — seeing what works, learning from what doesn’t, and incorporating those lessons into every new design.
Fabrication Capabilities
Glass handling equipment needs to be robust. Our Cedar Rapids, Iowa facility builds cullet systems using the same heavy fabrication capabilities we apply across all our industrial conveyor work — 3kW fiber laser cutting for precision structural components, 300-ton press brake for forming heavy-gauge frame members and chute sections, and certified welding for the structural integrity that glass handling loads demand. Systems are assembled and tested in our facility before shipping.
Start Your Glass Handling Conveyor Project
Whether you’re building a new glass fabrication facility, adding cullet handling to production lines that are currently managed manually, or replacing an aging system that’s causing maintenance problems and downtime, we’d like to discuss your project. Contact us at (319) 449-3322 or visit our contact page. We’ll talk about your facility, your glass types, your production layout, and your cullet volumes — then design a system that handles all of it reliably.
