Extra-Thick Corrugated Cardboard Liners

Our Extra-Thick Corrugated Cardboard Liners feature a reinforced, multi-layer composite structure. The interlocking corrugated layers provide exceptional compressive strength and significantly enhanced edge-crush resistance, ensuring stability under heavy stacking loads without collapsing or crushing. They are ideal for the long-distance sea and land transport of heavy goods.

Key Applications

Base padding and inter-layer separation for heavy goods to distribute weight and pressure.

Prevention of bottom-box collapse and product deformation caused by heavy stacking.

Protective separation for metal parts and coated components to prevent scratches or friction damage to finishes.

Layered separation for containerized or palletized goods to balance loads.

Use in conjunction with fixed grid dividers to reinforce the box's load-bearing base.

A paper-based alternative to solid wood or thick plastic dunnage, meeting export environmental regulations.

Key Selling Points

Flat, Rigid Surface for Reliable Protection

Fully automated flattening ensures the board resists warping or buckling; clean, burr-free edges prevent scratches on painted or plated surfaces.

One-Piece Design for Efficient Assembly-Line Operations

No interlocking or splicing required---simply lay flat for immediate use. Eliminates assembly steps, making it ideal for high-volume, standardized factory packaging.

Eco-Friendly and Recyclable; Hassle-Free Customs Clearance

Made from 100% paper-based material that is fully biodegradable and recyclable. Avoids quarantine issues associated with wood packaging and meets environmental standards in Europe, the Americas, and Southeast Asia.

Flexible, Customizable Solutions

Fully customizable dimensions (length/width), number of corrugated layers, flute types, and moisture-resistant lamination. Options include standard heavy-duty 5-layer boards or ultra-heavy-duty 7-layer boards. Lower long-term total cost

Lighter in weight compared to wooden or plastic pallets, resulting in reduced logistics and shipping costs; offers significant unit price advantages for bulk purchasing, and allows for space-efficient flat stacking during storage.

Technical Specifications

1. Material and Corrugation Options

5-ply reinforced corrugated board (BC/BE flute, double-wall): Standard heavy-duty use; suitable for stacking loads of 20--50 kg.

7-ply reinforced corrugated board (AAB/BBC flute, triple-wall): Ultra-heavy-duty applications; suitable for loads exceeding 50 kg, high-stacking scenarios, and ocean container shipping.

Raw Materials: Premium Grade-A high-grammage kraft linerboard; strong adhesive bonding prevents delamination or glue failure.

Optional Finishes: Single/double-sided lamination or waterproof coating to enhance moisture and humidity resistance.

2. Standard Board Grammage Configuration

Linerboard Grammage: 230g, 250g, 280g, 300g (high-rigidity kraft); 7-ply heavy-duty versions feature upgraded high-grammage liner and medium combinations.

3. Dimensions and Specifications

Precision cutting based on carton internal dimensions or pallet sizes.

Standard square-cut corners (no notches or slots).

Dimensional tolerance controlled within ±1mm; ensures a flush fit without gaps when laid flat in the carton.

4. Production Process Parameters

CNC fully automated cutting ensures smooth, clean edges.

Pre-flattening treatment ensures boards are free from warping or bulging upon delivery.

High-temperature lamination of corrugated layers ensures structural integrity under load.

5. Physical Properties

Multi-layer hollow structure provides both compressive strength and shock absorption.

5-ply version offers stable static load-bearing; 7-ply version withstands extreme stacking loads.

Moisture-resistant laminated versions are suitable for humid warehouses and ocean freight environments.

6. Shipping Format

Neatly stacked and bundled full-sized sheets; shipped flat without folding.

Application Areas

1. Hardware, Auto Parts, and Machinery Components

Suitable Products: Stamped parts, automotive components, motor housings, heavy-duty hardware kits.

Case Study: Auto parts factory packing heavy components; thick liner pads placed at the bottom prevent deformation of bottom-layer parts due to pressure, significantly reducing damage during long-distance logistics.

2. Home Appliances and Large-Scale Lighting Industries

Applicable products: Light fixture housings, small appliance casings, metal-coated components.

Real-world application: Packaging for large lighting fixtures; using thickened corrugated divider sheets between layers to separate products and prevent surface coatings from being scratched by heavy pressure.

3. Beverages and Heavy Glass Containers

Applicable products: Large liquor/beverage bottles, large-capacity glass jars, heavy ceramic containers.

Real-world application: Multi-layer stacking within cases; thickened divider sheets at the bottom distribute weight, preventing breakage of bottom-layer glass bottles due to pressure.

4. Industrial Warehousing, Pallet Logistics, and Container Shipping

Applicable scenarios: Pallet load separation/layering, export container loading, heavy-duty goods handling.

Real-world application: Used by export factories as an alternative to wooden dunnage; eliminates the need for fumigation, ensures shipping compliance, and balances pallet loads.

5. Construction Materials, Small Metal Sheets, and Mold Components

Applicable products: Small molds, metal profiles, construction hardware/accessories.

Real-world application: Paired with workshop handling bins for long-term use; offers high compressive strength and wear resistance, suitable for repeated circulation.

Certification and Quality Assurance

1. Authoritative Certifications

Passed SGS testing for biodegradable paper materials

Passed RoHS testing for hazardous substances

Complies with domestic industry standards for transport packaging cardboard

Test reports and certificates of conformity available; supports foreign trade customs clearance, bidding processes, and platform onboarding

Free from heavy metals and harmful chemical additives; suitable for packaging across multiple international markets

2. Four-Stage Factory Quality Control System

Raw material inspection: Verification of base paper grammage, bonding strength, and edge crush resistance

Lamination and cutting inspection: Monitoring of corrugation bonding, dimensional accuracy, and edge quality

Finished product sampling: Checks for flatness, compressive strength, and folding endurance

Pre-shipment visual inspection: Removal of warped, damaged, or delaminated sheets; finished product pass rate ≥ 99.8%

After-Sales and Usage Support

Selection guidance: Recommendations for 5-ply or 7-ply solutions based on cargo weight, stacking height, and transport method

Usage guidance: Illustrated references provided for flat-lay applications and combinations with grid-style dividers

Quality assurance: Free replacement or exchange in the event of dimensional deviations, delamination, or cutting defects upon receipt

Long-term support: Maintenance of dimensional records for existing clients; free recalculation of insert dimensions if carton specifications change

Packaging and Shipping Standards

1. Product Packaging

Inserts are neatly stacked and encased in 5-ply corrugated outer cartons; paper edge protectors are installed on long sides to prevent crushing or bending during transit; outer packaging is labeled with specifications, corrugation type, and quantity.

2. Logistics Methods

Courier delivery for small orders; dedicated freight lines for bulk orders; export-standard packaging for international trade orders. 3. Shipping Lead Times

Standard-sized stock items: Shipped within 24 hours. Custom-cut specifications: Typically shipped within 48 hours; urgent orders can be negotiated for expedited production scheduling.

Customer Trust & Brand Credibility

1. Export Credentials

Our extra-thick corrugated cardboard liners are widely used for heavy-duty industrial exports and container shipping. They serve as eco-friendly alternatives to wooden pallets and meet the customs requirements of various countries.

2. Client Base

We serve auto parts manufacturers, lighting companies, hardware manufacturers, and foreign trade supply chain businesses. Many clients purchase them in sets with grid-style (waffle) dividers and place repeat orders consistently. (Space available to display logos of partner clients)

3. Factory Capabilities

Equipped with multi-layer corrugated lamination lines and CNC cutting equipment, we ensure stable mass production of 5-layer and 7-layer heavy-duty corrugated boards, with ample capacity for both small and large orders. (Images: Workshop production line, raw material warehouse, stacks of extra-thick boards)

4. Authentic Customer Reviews

① "The boards are thick and rigid; they provide a solid base for heavy parts, and the boxes don't collapse even when stacked high." --- Auto parts manufacturer ② "We use them to replace wooden pallets; they eliminate the need for fumigation, simplify export customs clearance, and are cut to precise dimensions." --- Foreign trade supplier ③ "When paired with grid dividers, the bottom load-bearing capacity is greatly enhanced, and issues with goods bumping or being crushed are significantly reduced." --- Lighting packaging client

Service Overview

1. Sample & Testing Support

Free sample delivery available for on-site testing of thickness, rigidity, and load-bearing performance.

Environmental test reports and product certificates of conformity available for inspections, export customs clearance, and tender applications.

2. Warranty Service

12-month warranty provided under conditions of proper storage (dry environment) and reasonable load usage. Free replacements provided for issues such as delamination or manufacturing defects during the warranty period. Damage caused by water exposure or overloading/excessive pressure is not covered. 3. Return and Exchange Policy

If not satisfied with the sample, returns or exchanges can be negotiated.

For mass-production orders, if there are dimensional errors or manufacturing defects, we offer free remanufacture and replacement or a full refund.

If fitment issues arise due to customer-provided dimensions, we can assist with re-cutting for a nominal basic processing fee.

For in-stock liners with no quality issues, returns or exchanges are accepted within 7 days without a specific reason, provided the packaging remains unopened and the product is in a condition suitable for resale.

Customization Support

1. Complete Customization Process

Requirement Consultation (carton/pallet dimensions, cargo weight, stacking height, moisture-proofing needs, transport method) → Recommendation of 5-ply or 7-ply corrugated solutions → Parameter confirmation → Sample shipment (upon request) → Batch production → Finished product QC → Packaging & shipping → After-sales follow-up

2. Production Process

Raw paper incoming QC → High-temperature lamination/forming of multi-ply corrugated board → Board flattening → Precision CNC cutting → Edge finishing & dust removal → Appearance & performance spot checks → Neat stacking & packaging → Warehousing & shipping

Real-World Usage Experience

Extra-Thick Corrugated Cardboard Liners are a specialized load-bearing solution designed for heavy-duty goods, high-stacking requirements, and heavy loads; they represent a high-strength upgrade over standard flat-edge corrugated liners.

Compared to standard 3-ply liners: Compressive strength is more than doubled, preventing collapse during high stacking. Compared to wooden or plastic sheets: Lighter weight reduces logistics costs; being 100% paper-based eliminates the need for fumigation, offering distinct advantages for export. Compared to foam pads: Superior load-bearing capacity, making them ideal for heavy metal components and large industrial products. Commonly used in scenarios involving heavy goods that require strong base support and multi-layer stacking; often paired with fixed grid dividers to create an integrated "base load-bearing + individual item separation" packaging solution, effectively minimizing product damage caused by heavy compression.

FAQ

Q1: How do I choose between standard flat-edge liners, extra-thick corrugated liners, perforated liners, and various types of dividers? A: Simple layering for lightweight goods → Standard flat-edge liners; Heavy goods or base layers for high stacking → Extra-thick corrugated liners; Fresh produce requiring ventilation and moisture resistance → Perforated corrugated liners; Separating individual items to prevent collision → Grid-style dividers; Varied SKU specifications → Adjustable carton dividers.

Q2: What information is needed to purchase extra-thick corrugated liners?

A: Internal dimensions (length/width) of the carton or pallet, weight of individual items, number of stacking layers, mode of transport (land/sea), and warehouse humidity levels; we will then recommend the appropriate corrugated board structure.

Q3: Are extra-thick corrugated liners suitable for containerized sea freight exports?

A: Yes, perfectly suitable; they are made entirely of paper---containing no wood---so no fumigation is required. For humid maritime environments, we offer customizable options with double-sided waterproof lamination.

Q4: Is there tiered pricing for bulk purchases of extra-thick liners?

A: Yes, the unit price decreases as the order volume increases; we apply a tiered pricing structure. Long-term, steady clients can negotiate exclusive pricing and receive priority in production scheduling.

Q5: How can we prevent extra-thick corrugated boards from softening due to moisture in humid warehouses?

A: Opt for single-sided or double-sided lamination or waterproof coating processes to enhance moisture resistance; also, try to keep the storage area dry and well-ventilated.

Q6: Can extra-thick corrugated liners be reused multiple times?

A: Yes; 5-ply and 7-ply extra-thick boards offer superior durability and toughness. Provided they are not crushed or damaged, they can be reused repeatedly, making them ideal for long-term use with factory workshop handling containers.