5 Ply Heavy-Duty Cartons
5-ply heavy-duty corrugated cartons feature a double-wall construction composed of two layers of fluting (typically a combination of BC-flute or AB-flute) bonded between three flat linerboards. This configuration delivers high edge crush resistance (ECT), superior stacking strength, and exceptional burst protection, engineered specifically for heavy industrial components, bulk e-commerce freight, and long-distance transit.
Key Product Features
Double-Wall Structural Integrity: Combines two distinct corrugated flutes to absorb high dynamic impact and distribute vertical load evenly across the packaging perimeter.
High Edge Crush Resistance (ECT): Engineered to withstand rigorous warehouse stacking loads without structural buckling or sidewall collapse.
Puncture and Burst Protection: Multiple layers of heavy kraft linerboard guard against sharp internal components and external transit punctures.
Moisture-Resistant Outer Liner: Kraft facings provide baseline resistance to ambient humidity fluctuations during container shipping.
Precision Die-Cut and Slotting: Clean slotting and folding lines ensure rapid mechanical erection and tight dimensional tolerance on automated packaging lines.
Key Specifications
|
Technical Parameter |
Specification Range / Standard |
|
Material Structure |
5-Ply Double-Wall Corrugated Fiberboard (AB Flute / BC Flute) |
|
Grammage Range (GSM) |
300 GSM – 900 GSM (Customizable liner and medium combinations) |
|
Edge Crush Test (ECT) |
32 ECT – 51 ECT (Dependent on weight capacity requirements, tested per TAPPI standards) |
|
Bursting Strength |
200 PSI – 350 PSI |
|
Dimensions |
Custom length, width, and depth built to product specifications |
|
Color Options |
Kraft Brown (Standard), White/Bleached Outer Liner |
|
Joinery Type |
Glued, Stitched (Metal Stapled), or Slotted Regular Slotted Carton (RSC) |
|
Compliance and Certifications |
ISO 9001 Quality Management System, FSC-certified sustainable raw materials available |
Applications
Industrial and Automotive Hardware: Bulk transit for metal castings, machined parts, heavy fasteners, and pneumatic components.
Electronics and Appliances: Secondary and primary outer packaging for medium-to-heavy home appliances, server components, and power units.
E-Commerce Heavy Freight: High-density fulfillment items, subscription kit bulk packing, and multi-item heavy parcel consolidation.
Export and Long-Distance Logistics: Cross-border ocean and land freight vulnerable to severe vibration, multi-tier stacking, and repeated handling.
Printing and Customization
Direct-to-board water-based ink printing supporting up to 3 colors for shipping marks, part numbers, and company logos.
Tailored length, width, and height configurations to eliminate internal void space and reduce the need for excessive dunnage.
Ventilation die-cuts, reinforced hand holes, partition inserts, and inner padding integration.
Quality Inspection
Bursting Test: Measures total pressure resistance required to rupture the multi-layer corrugated board.
Edge Crush Test (ECT): Verifies vertical stacking performance to ensure structural safety under palletized storage conditions.
Caliper (Thickness) Check: Ensures consistent board thickness across production batches to prevent structural weakness.
Glue Lap Adhesion Test: Inspects joint seam integrity to prevent box splitting under dynamic payload stress.
Manufacturing Process
Fluting and Corrugation:
Kraft paper is fed through high-temperature fluting rollers to form flute profiles, then bonded to linerboards using high-strength starch adhesive.
Board Slitting and Scoring:
Continuous corrugated boards are slit to precise widths and scored along folding lines.
Flexographic Printing and Slotting:
Inline printing plates apply required markings while rotary dies cut flap geometry and slot lines.
Box Gluing and Stitching:
The box blank joint is permanently secured using industrial water-based adhesive or high-tensile metal wire stitching.
Bundling and Strapping:
Finished cartons are flat-packed, strapped in count bundles, and palletized for protective storage.
Packaging and Shipping
Flat-Pack Delivery: Supplied flat-bundled on wooden or plastic export-grade pallets to optimize container space and minimize inbound freight costs.
Pallet Protection: Stretch-wrapped and corner-protected to prevent moisture ingress and transit friction during long-haul shipping.
Container Loading: Maximized cubic meter utilization for 20GP and 40HQ container shipments.
FAQ
Q: What is the weight capacity limit for 5-ply heavy-duty cartons?
A: Standard 5-ply cartons typically support contents weighing between 50 lbs to 150 lbs (approx. 23 kg to 68 kg), depending on the specific ECT rating, flute combination, and internal weight distribution.
Q: What is the difference between AB flute and BC flute in 5-ply boards?
A: AB flute combines a larger A-flute (higher stacking clearance) with a tighter B-flute (flat surface for printing and puncture resistance), offering optimal balance for heavy industrial transport. BC flute provides a slightly thinner profile while maintaining high stacking compression strength.
Q: Are these cartons suitable for ocean freight and humid export environments?
A: Yes. The multi-layer kraft structure withstands moderate transit humidity, backed by standardized quality controls. For prolonged marine transit, customized moisture-resistant outer liner treatments are available upon request.
Q: What is the minimum order quantity (MOQ) for custom dimensions?
A: MOQs vary based on size specifications and flute configuration. Contact our engineering team with your exact dimensions and payload requirements for specific batch thresholds.
Q: How are the boxes shipped to our facility?
A: Cartons are delivered flat-packed and palletized. This format reduces storage footprint in your warehouse and ensures efficient handling before automated or manual assembly.
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