Industrial Packaging has been supplying cardboard cores to Irish manufacturers for decades, and we’ve seen firsthand how core crush can bring production lines to a grinding halt. Whether you’re winding films, textiles, foils, or paper, the humble cardboard core sits at the heart of your operation – and when it fails, it can knock out your entire production line.
In case you are lucky enough not to have experienced cardboard crush issues, let’s clarify exactly what we mean by core crush and why getting this right matters so much for the bottom line.
Understanding Cardboard Core Crush
Core crush happens when the cylindrical structure of a cardboard tube collapses under pressure. Think of it like a drinks can – perfectly strong when intact, but once dented, it loses its structural integrity completely. The same principle applies to cardboard cores, except the consequences in manufacturing are far more serious.
Cores are everywhere in manufacturing because they do a brilliant job! They provide a stable foundation for winding materials, they’re lightweight yet strong, and they’re cost-effective. But when they fail? That’s when manufacturers really understand their value.
What Causes Cores to Crush?
From our experience working with manufacturers across Ireland, we see two main culprits:
Incorrect Core Specification
This is the big one. Cores with insufficient wall thicknesses simply aren’t up to the job. A 3mm wall might work fine for lightweight plastic film but try winding heavy-duty materials onto it and you’re asking for trouble. Don’t cut costs on thinner cores, match the specification to your specific application. The right core for the right job.
Environmental Factors
Ireland’s climate doesn’t do cardboard any favours. Our naturally high humidity can weaken the fibre structure of cores, especially if they’re stored incorrectly. Cores stacked directly on concrete floors or near open doors are particularly vulnerable – moisture wicks up through the cardboard, and suddenly what should be a strong core can become as soft as a wet newspaper.
The Real Cost of Core Crush in Manufacturing
Production Downtime
Imagine a crushed core jamming your main winding line during peak production. Your operators have to stop everything, cut away the damaged material, extract the crushed core, and reset the entire system. What should be a smooth production run turns into hours of unexpected downtime. At typical production rates, that could translate to thousands of euros in lost output.
Product Damage
When a core crushes mid-wind, the material doesn’t wind evenly anymore. In sectors such as pharmaceutical and food packaging, even minor creases or wrinkles mean the entire roll gets rejected. Picture losing an entire run of premium packaging because the core collapsed halfway through winding – potentially tens of thousands of euros worth of printed material heading straight to recycling.
Spiralling Costs
The damaged core itself might only cost a few euros to replace, but that’s just the tip of the iceberg. Factor in
- The wasted material wound onto the failed core
- Machine downtime while crews fix the problem
- Overtime labour to meet delayed deadlines
- Expedited shipping to make up for lost time
When you add it all up, the true cost of a single core failure could easily become quite significant.
Safety Risks
Something people often overlook is that crushed cores can create a genuine safety hazard. Damaged cores can cause entire stacks of rolls to become unstable. When a 200kg roll tips over because its core gave way, you’re looking at serious injury potential. Damaged rolls are also harder to handle safely. Operators can struggle with uneven weight distribution, increasing the risk of strains and accidents.
Quality Control Failures
Your customers expect consistency. When cores crush, roll tension becomes unpredictable. Imagine having an entire shipment rejected at a customer inspection because the rolls were wound inconsistently due to core issues. Once you lose a customer’s trust over quality, winning it back takes far more than just replacing a few cores.
How to Prevent Core Crush
Work with a Supplier Who Tests Core Crush Strength
At Industrial Packaging, we don’t just guess at core strength – we test it. Our flat crush testing procedures ensure every batch meets specifications. We test to ISO 11093 standards, giving a documented proof of performance.
Specify the Right Core Strength
You don’t always need to buy the strongest core available; you just need to match the core to your needs. We help clients calculate the right combination of:
- Wall thickness (typically 3mm to 15mm)
- Material grade (recycled vs virgin fibre content)
- Internal diameter (must match your machinery precisely)
A textile manufacturer might need completely different specifications than a plastic film producer, even if they’re winding similar weights.
Train Your Staff
Simple handling practices make a huge difference to core longevity
- Never drag cores across rough surfaces
- Use proper lifting techniques for heavy cores
- Rotate stock properly (first in, first out)
- Inspect cores for any visible damage, before use
Avoid Overstacking
Each core has a compression limit. We provide clear guidelines on maximum stacking heights for our cores, but these specifications vary across products. Stacking cores ten high to save floor space might seem efficient, but it could be a recipe for bottom-layer crush.
Control Storage Conditions
In Ireland’s damp climate, this is critical. Store cores
- Off the ground (use pallets or racking)
- Away from external walls and doors
- In areas with controlled humidity (below 65% relative humidity ideal)
- Protected from direct rain or splash zones
Simply moving core storage away from loading bay doors can reduce failures by up to 80%.
The Bottom Line
Core crush might seem like a minor issue until it happens on your production line. Then suddenly, production stops, costs spiral, and deadlines slip.
Industrial Packaging’s reputation in this context is proven, and it’s built on supplying cores that don’t let Irish manufacturers down. Every core we supply undergoes rigorous crush testing to ISO 11093 standards. We’re not just selling cardboard tubes – we’re protecting your production efficiency.
If you’re experiencing core crush issues or want to prevent them before they start, get in touch. We’ll ensure your cores are up to the job. Because when your cores work properly, you probably don’t think about them at all – and that’s exactly how it should be.
You can see our selection of tubes and cores here, or contact our team today.