What is PP/PE hollow sheet (hollow corrugated board) and what makes it special?

PP/PE hollow sheet, also known as corrugated plastic board, twin-wall polycarbonate sheet, or honeycomb panel, is a lightweight extruded plastic sheet with an internal ribbed structure creating hollow chambers between two flat surfaces. It offers an exceptional strength-to-weight ratio — up to 5x lighter than solid sheets of equal rigidity. Key properties include excellent impact resistance, moisture and chemical resistance, 100% recyclability (PP is fully recyclable), electrical insulation, and easy fabrication (cutting, folding, welding, printing). Available in thicknesses from 2-12 mm in widths up to 2,100 mm.

What is the difference between hollow sheet (twin-wall), solid sheet, and fluted board?

Three distinct products serve different needs: Hollow Sheet (Twin-Wall/Corrugated) features internal ribs between two skins — extremely lightweight (0.3-0.8 kg/m2), high stiffness-to-weight, ideal for signage, packaging dividers, construction formwork. Solid Sheet has no internal structure — uniform density throughout, higher weight but superior surface finish, used for glazing, machine guards, display panels. Fluted Board (Corrugated Fiberboard-style) has single-directional flutes like cardboard — lighter than twin-wall but lower strength, mainly used for low-cost packaging and temporary signage. Hollow sheet offers the best balance of structural performance, durability, reusability, and cost-per-cycle compared to alternatives.

Can one hollow sheet extrusion line produce both PP and PE materials?

Yes — Jwell hollow sheet extrusion lines are designed as multi-material platforms capable of processing PP (polypropylene), PEHD/LDPE (polyethylene), and optionally PC (polycarbonate). However, each material requires specific adjustments when switching: Processing temperatures differ significantly (PP: 190-230C, PE: 160-200C, PC: 260-300C); Screw design may need optimization — PP benefits from barrier/mixing screws, PE requires gentler compression ratios; Die gap settings change due to material melt strength differences; Cooling calender/vacuum tank parameters must be readjusted; Additive packages differ (UV stabilizers for outdoor PP, antistatic agents for electronics). Jwell engineers provide complete switch-over protocols and can configure lines with quick-change components to minimize downtime during material transitions.

What are the key advantages of Jwell hollow sheet extrusion machines vs competitors?

Jwell delivers four decisive advantages for hollow sheet production: (1) Proprietary Hollow Die Technology — our internally-designed dies with precision-machined forming mandrels ensure consistent wall thickness distribution across the full sheet width, eliminating common issues like thin spots or collapsed ribs. (2) Advanced Vacuum Calibration System — multi-stage vacuum tanks with individually adjustable zones provide superior geometry control, critical for achieving flatness tolerance within +-0.15mm/m. (3) In-House Core Manufacturing — barrels, screws, dies, rollers ALL made by Jwell, meaning full quality control and 30% cost advantage versus European brands. (4) Global Service Network with 80+ hollow sheet lines installed in North America alone since 1997. Most wear parts stocked locally for rapid delivery.

What is the delivery timeline and installation process for a Jwell hollow sheet line?

Typical project timeline from order to production: Manufacturing lead time is 60-90 days including factory acceptance test (FAT) with trial runs on actual material. Ocean freight varies by destination: 25-35 days to North American ports, 20-30 days to Europe, 7-15 days to Southeast Asia/Middle East. On-site installation by Jwell engineers takes 18-28 days covering: foundation preparation verification, mechanical alignment of extruder-die-calibration train, electrical integration and PLC programming, vacuum system commissioning, water cooling loop setup, material trials with your specific resin grades, operator training (3-5 days hands-on), and final production sign-off. Total order-to-production is typically 3.5-4.5 months. We recommend ordering 4 months before planned production start date.

Common hollow sheet production problems and how to fix them?

Five most frequent issues and proven solutions: (1) Rib Collapse / Deformation — insufficient internal air pressure or excessive haul-off speed; increase internal air pressure gradually, reduce puller speed, check vacuum calibration tank suction levels. (2) Uneven Wall Thickness — die lip gap imbalance or off-center mandrel position; recalibrate die bolt torque pattern, verify mandrel centering with feeler gauges. (3) Surface Roughness / Melt Fracture — too low melt temperature or excessive shear rate at die land; raise barrel zone temps near die exit by 5-10C, consider broader die land gap or processing aid additive. (4) Warping / Curling — asymmetric cooling causing differential shrinkage; balance vacuum tank water spray patterns, adjust haul-off nip roller pressure evenly. (5) Dimensional Instability (width/thickness fluctuation) — inconsistent feeding or screw surging; check gravimetric feeder accuracy, verify temperature controller PID tuning, inspect screw barrel for excessive wear clearance.

Does Jwell provide warranty, training, and after-sales support for hollow sheet extrusion lines?

Yes — comprehensive lifetime support included: Warranty covers 12 months on all mechanical and electrical manufacturing defects with free replacement parts shipped during warranty period. Installation and Commissioning includes experienced Jwell engineers at your facility for complete setup, die assembly, vacuum system tuning, material trials, and successful production run sign-off. Operator Training provides 3-5 days hands-on instruction covering startup/shutdown procedures, material handling (drying requirements for hygroscopic resins), die adjustment techniques, routine maintenance schedules, safety protocols, and troubleshooting methodology. Spare Parts Inventory keeps critical items in stock — heater bands, thermocouples, vacuum pump filters, cutter blades, seal kits, screen packs — for same-day or next-day dispatch. Remote Diagnostics via cloud-connected monitoring allows Jwell engineering team to view real-time operating data and provide proactive maintenance recommendations. Contact us anytime: +86 18851202565 or infzs@jwell.cn.

PP PE hollow sheet extrusion line - Jwell Machinery - Professional Extrusion Machine Manufacture

Q: How does a hollow sheet extrusion line work?

A hollow sheet extrusion line operates through: (1) Raw material (PP/PE granules with optional additives/colorants) fed into extruder hopper; (2) Single or twin-screw system melts and homogenizes material at 190-230C for PP, 160-200C for PE; (3) Molten polymer enters a specialized hollow die that splits flow into upper and lower lips with internal forming pins creating the rib structure; (4) The hollow profile enters a vacuum calibration tank where internal air pressure and external vacuum form and cool the precise hollow geometry; (5) Haul-off unit pulls the formed sheet at controlled speed; (6) Cutting saw cuts to length. Jwell lines use Siemens PLC + ABB inverters for full process control.

Q: What industries use PP/PE hollow corrugated sheets?

Hollow sheets serve remarkably diverse industries globally: Packaging & Logistics — reusable shipping containers, pallet sleeves, box partitions, dunnage pads, protective corners; Advertising & Signage — real estate signs, event signage, point-of-purchase displays, screen printing substrates; Construction & Building — concrete formwork, floor protection, temporary site barriers, sandwich panel cores, greenhouse panels; Agriculture — greenhouse cladding, seedling trays, grain bin liners; Automotive — interior trunk liners, cargo mats, protective covers; Electronics — ESD-safe packaging, component trays; Furniture — modular furniture cores, wardrobe backings, drawer bottoms. Its combination of light weight, durability, printability, and recyclability drives adoption across all these sectors.

Q: What models and specifications do Jwell hollow sheet extrusion lines offer?

Jwell offers two primary hollow sheet extrusion line models optimized for different production scales: JWS120 produces sheets up to 1,220 mm wide, 2-8 mm thick, at 300-400 kg/h output capacity using a 120mm single screw. JWS130 produces wider sheets up to 2,100 mm, 2-8 mm thick, at 400-500 kg/h output using a 130mm screw. Both feature precision hollow-forming dies with interchangeable mandrels for different rib configurations (V-shape, rectangular, X-shape), vacuum calibration tanks with multi-zone cooling, Siemens PLC automation, ABB variable frequency drives, and automatic flying cutters. Custom widths, thicknesses up to 12 mm, and co-extrusion options (UV layer, colored skin layers) are available on request.

PP PE hollow sheet extrusion line

1. What is PP/PE hollow sheet (corrugated board) and what makes it special?

PP/PE hollow sheet — also called twin-wall sheet, honeycomb panel, coroplast/corflute board, or corrugated plastic board — is a lightweight extruded plastic sheet with an internal ribbed structure creating hollow chambers between two flat outer skins. This unique sandwich construction delivers an extraordinary strength-to-weight ratio that solid sheets simply cannot match.

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Ultra-Lightweight

Up to 5x lighter than solid sheets of equal rigidity
Density only 0.3~0.8 kg/m²

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High Strength-to-Weight

Internal ribs act like I-beams
Excellent flexural & impact stiffness

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100% Recyclable

PP/PE fully recyclable (Grade 5 / Grade 4)
Eco-friendly & circular economy ready

Key Material Properties at a Glance:

Moisture Resistance: Completely waterproof — does not swell, warp, or degrade when wet; ideal for outdoor and refrigerated applications
Chemical Resistance: Resistant to most oils, acids, alkalis, and solvents; suitable for laboratory and chemical packaging
Electrical Insulation: Excellent dielectric properties; widely used for ESD-safe electronic packaging and transformer insulation
Thermal Stability: Operating range from -20°C to +80°C (PP) or -40°C to +70°C (PE); short-term peaks up to +100°C possible
Flame Retardancy: Available in FR grades meeting UL94 V-2, V-1, and V-0 standards for construction and transportation use
UV Weatherability: Can be co-extruded with UV-absorbing cap layers for extended outdoor service life (3–10 years depending on grade)
Easy Fabrication: Can be cut with knife/saw, folded along flute lines, ultrasonically welded, heat-bent, screen/digital printed, die-cut, and grommeted
Food Contact Safe: FDA-compliant grades available for direct food-contact applications such as produce trays and bakery containers

Available Production Range on Jwell Extrusion Lines:

Thickness: 2 – 12 mm
(standard 2–8 mm, custom up to 12 mm)

Width: up to 2,100 mm
(JWS130 max width)

Rib Styles: V-shape / Rectangular / X-shape / Custom
Interchangeable forming mandrels

Colors: Unlimited
Masterbatch or co-extruded skin layers

Output Speed: 1.5 – 6 m/min
Depending on thickness & material

Why choose hollow sheet over alternatives? Compared to cardboard (damages when wet, single-use), solid plastic sheets (heavy, expensive), foam boards (fragile surface, not reusable), and metal panels (corrosive, heavy), hollow corrugated plastic offers the best combination of durability, lightweight, printability, fabricability, reusability, and total cost-per-use-cycle. It is rapidly replacing traditional materials across packaging, signage, construction, automotive, and agricultural industries worldwide.

Technical Specification

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Model	JWS120	JWS130
Product Width (mm)	1220	2100
Sheet Thickness (mm)	2~8	2~8
Machine Capacity (kg/h)	300~400	400~500

Used For

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Machine Type(JWS130)

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FAQs

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Frequently Asked Questions

Everything you need to know about PP/PE hollow sheet extrusion lines

1. What is PP/PE hollow sheet (corrugated board) and what makes it special?

PP/PE hollow sheet — also called twin-wall sheet, honeycomb panel, or corrigated plastic board — is a lightweight extruded sheet with an internal ribbed structure creating hollow chambers between two flat outer skins.

🪶

Lightweight

Up to 5x lighter than solid sheets of equal rigidity
(0.3~0.8 kg/m²)

💪

High Strength

Excellent stiffness-to-weight ratio
Impact resistant

♻️

100% Recyclable

PP/PE fully recyclable
Eco-friendly material choice

Moisture & Chemical Resistant — unaffected by water, oils, most chemicals
Electrical Insulation — safe for electronic packaging and ESD applications
Easy Fabrication — can be cut, folded, welded, printed, and corfluted
Available Thickness: 2–12 mm | Width: up to 2,100 mm

2. How does a hollow sheet extrusion line work?

A hollow sheet extrusion line operates through a specialized continuous process:

Material Feeding: PP/PE granules (with optional colorants, UV stabilizers, flame retardants) loaded into the extruder hopper via gravimetric feeder for precise dosing
Melting & Mixing: Single or twin-screw conveys, melts, and uniformly mixes material through heated barrel zones (190–230°C for PP, 160–200°C for PE)
Hollow Die Forming: Molten polymer enters a specialized split-flow die that directs material to upper/lower lips while internal forming pins create the rib structure between the two skins
Vacuum Calibration: The hollow profile enters a vacuum sizing tank where internal air pressure + external vacuum precisely forms and cools the hollow geometry, locking in the rib dimensions
Haul-Off: Rubberized nip rollers pull the formed sheet at controlled speed, maintaining dimensional stability
Cutting: Flying cutoff saw cuts sheets to programmed lengths automatically

Jwell lines feature Siemens PLC + ABB inverter control monitoring all zones: barrel temps, die temp, melt pressure, motor load, vacuum level, internal air pressure, haul-off speed, and cutting length.

3. What is the difference between hollow sheet and solid sheet?

Property	Hollow Sheet (Twin-Wall)	Solid Sheet
Internal Structure	Ribs between 2 skins	None (solid throughout)
Weight	Very Light (best)	Heavy
Stiffness-to-Weight	Excellent	Good
Reusability	Highly Reusable (50+ cycles)	Highly Reusable
Fabrication	Cut, fold, weld, print, die-cut	Cut, thermoform, drill, print
Best For	Signage / Packaging dividers Formwork / Display / Protection	Glazing / Machine guards Windows / Safety shields
Cost per Use Cycle	Best value (reusable)	Higher initial cost

Bottom line: Choose hollow sheet when lightweight reusability, printability, and cost-per-cycle matter most — packaging, signage, construction formwork, event displays. Choose solid sheet when surface finish quality, optical clarity, or absolute structural integrity is required — glazing, safety windows, machine guards.

4. What industries use PP/PE hollow corrugated sheets?

Packaging & Logistics
Reusable shipping containers • Pallet sleeves • Box partitions • Dunnage pads • Protective corner guards

Advertising & Signage
Real estate signs • Event signage • POP displays • Screen-printed boards • Exhibition graphics

Construction & Building
Concrete formwork • Floor protection • Site barriers • Sandwich panel cores • Temporary fencing

Agriculture
Greenhouse cladding • Seedling trays • Grain bin liners • Poultry house partitions

Automotive
Interior trunk liners • Cargo area mats • Protective covers • Under-seat components

Furniture & Interiors
Modular furniture cores • Wardrobe backing • Drawer bottoms • Room dividers

5. What models and specifications do Jwell hollow sheet extrusion lines offer?

Specification	JWS120	JWS130
Sheet Width	Up to 1,220 mm	Up to 2,100 mm
Sheet Thickness	2 – 8 mm (up to 12 mm custom)
Output Capacity	300 – 400 kg/h	400 – 500 kg/h
Screw Diameter	120 mm single screw	130 mm single screw
Rib Configuration	Interchangeable mandrels: V-shape, Rectangular, X-shape, Custom
Control System	Siemens PLC + ABB Inverter (full automation)

Both models feature precision hollow-forming dies with interchangeable mandrels, multi-zone vacuum calibration tanks, and automatic flying cutters. Co-extrusion options available: UV-resistant cap layer, colored skin layers, anti-static core layer.

6. Can one extrusion line produce both PP and PE hollow sheets?

Yes. Jwell hollow sheet lines are designed as multi-material platforms capable of processing both PP and PE (HDPE/LDPE). Each material requires specific parameter adjustments when switching:

Parameter	PP (Polypropylene)	PE (Polyethylene)
Processing Temperature	190 – 230°C	160 – 200°C
Screw Design	Barrier/mixing screw	Gentle compression ratio
Drying Required?	No (normally)	No (normally)
Typical Additives	UV stabilizer, antistatic	Antioxidant, slip agent
Melt Flow Behavior	Higher viscosity, shear-sensitive	Lower viscosity, easier flow
Cooling Speed	Moderate (crystallizes fast)	Slower (requires more cooling length)

Jwell Advantage: We provide complete material switch-over protocols and can configure lines with quick-change components (screw sets, die adapter plates) to minimize downtime during material transitions.

7. What advantages do Jwell hollow sheet extrusion lines offer over competitors?

Proprietary Hollow Die Technology

Internally-designed dies with precision-machined interchangeable forming mandrels ensure consistent wall thickness across the full sheet width. Eliminates common industry problems: thin spots, collapsed ribs, and dimension drift during long production runs.

Advanced Multi-Zone Vacuum Calibration

Multi-stage vacuum tanks with individually adjustable zones deliver superior geometry control — achieving flatness tolerance within ±0.15mm/m. Critical for applications demanding tight dimensional consistency.

In-House Core Manufacturing = 30% Cost Savings

Barrels, screws, hollow dies, calibration tooling, rollers — ALL manufactured by Jwell. No third-party outsourcing means full end-to-end quality control and pricing comparable to top German brands at roughly 30% lower total investment.

Proven Track Record — 80+ Lines in North America Alone

Since 1997, serving customers across 100+ countries. Our hollow sheet expertise spans every major market: packaging converters, signage manufacturers, construction suppliers, automotive Tier suppliers. We have seen and solved every hollow sheet production challenge imaginable.

8. How long is the delivery and installation timeline?

Phase 1
Order → Ex-Factory Ready
60–90 days

Fabrication, assembly, factory acceptance test (FAT) with trial run on your actual resin grade

Phase 2
Ocean Freight (Shanghai)
7–35 days

NA/EU 25-35d · SE Asia/Middle East 7-15d · South America 35-45d

Phase 3
Customs & Local Delivery
5–15 days

Varies by destination country import regulations and customs processing speed

Phase 4
On-Site Installation
18–28 days

Foundation prep → Mechanical align → Electrical → Vacuum tune → Material trials → Training → Sign-off

Planning Tip: Place orders 4 months ahead of planned production start date. Hollow sheet lines involve complex die/calibration setup — allow extra buffer time.

9. Common hollow sheet production problems and solutions?

01
Rib Collapse / Deformation

Cause: Insufficient internal air pressure inside hollow chambers, or excessive haul-off speed pulling ribs out of shape before they fully cool

Fix: Increase internal air pressure gradually in 0.05 bar steps; reduce puller speed by 10-15%; check vacuum calibration tank suction level at each zone

02
Uneven Wall Thickness

Cause: Die lip gap imbalance across sheet width, off-center mandrel position causing asymmetric flow distribution

Fix: Recalibrate die bolt torque pattern at 10+ points; verify mandrel centering with feeler gauges; check die land parallelism with feeler gauges under 0.05mm tolerance

03
Surface Roughness / Melt Fracture

Cause: Melt temperature too low for stable flow, or excessive shear rate at die land creating melt fracture surface defects (sharkskin)

Fix: Raise barrel temps 5-10C near die exit; broaden die land gap if possible; add 0.5-1% processing aid masterbatch to reduce melt fracture onset

04
Warping / Curling

Cause: Asymmetric cooling between top and bottom skin surfaces causing differential shrinkage stress as the sheet cools unevenly

Fix: Balance vacuum tank water spray patterns on top/bottom equally; adjust haul-off nip roller pressure to be even on upper and lower rollers

05
Dimensional Instability (Width/Thickness Fluctuation)

Cause: Inconsistent gravimetric feeding output, or screw surge from worn barrel-screw clearance allowing backflow variation

Fix: Verify gravimetric feeder accuracy within ±0.5%; check PID tuning on all temperature controllers; inspect screw/barrel wear gap — replace if >0.5mm clearance

Need help? Jwell after-sales team provides troubleshooting guides, video consultations, and on-site diagnostics. Contact +86 18851202565 or [email protected].

10. Does Jwell provide warranty, training, and after-sales support?

Yes — comprehensive lifetime support covering every phase of ownership:

12-Month Warranty
Full coverage on mechanical/electrical components. Free replacement parts during warranty period.

Installation & Commissioning
Jwell engineers travel to your facility: die assembly, vacuum system tuning, material trials, production sign-off.

Operator Training Program
Hands-on training 3-5 days: operation, material handling (drying), die adjustment, maintenance, QA, troubleshooting.

Spare Parts Inventory
Heater bands, thermocouples, vacuum pump filters, cutter blades, seal kits — same-day/next-day dispatch ready.

Remote Diagnostics
Cloud-connected machines transmit real-time data. Proactive recommendations prevent unplanned downtime.

Ready to Get Started?

+86 18851202565
[email protected]
www.jwellplate.com

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Why Choose Jwell

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High Quality Jwell Machinery Co.,Ltd machine barrels , screws , T-die and roller all by ourselves , we control the machine quality from drawing design to final installation.
Save Your 30% Money Comparable to the quality of Top Germany’s extruders , reasonable affordable prices . High effective single screw extruders and twin screw extruders .
Global Sales Service Jwell Machinery Co.,Ltd has sales office in Turkey , Vietnam , Thailand , Brazil , Canada , there are over 500 plastic engineers serve Jwell customer all over the world .
On Time Delivery Of Spare Parts Jwell Machinery Co.,Ltd has almost all key parts of our products in stock and We remotely monitor the cloud status of the machine and provide timely maintenance suggestions ,we promise your extruder will never stop running .

PP PE hollow sheet extrusion line

1. What is PP/PE hollow sheet (corrugated board) and what makes it special?

Technical Specification

Used For

Machine Type(JWS130)

FAQs

Frequently Asked Questions

1. What is PP/PE hollow sheet (corrugated board) and what makes it special?

2. How does a hollow sheet extrusion line work?

3. What is the difference between hollow sheet and solid sheet?

4. What industries use PP/PE hollow corrugated sheets?

5. What models and specifications do Jwell hollow sheet extrusion lines offer?

6. Can one extrusion line produce both PP and PE hollow sheets?

7. What advantages do Jwell hollow sheet extrusion lines offer over competitors?

8. How long is the delivery and installation timeline?

9. Common hollow sheet production problems and solutions?

10. Does Jwell provide warranty, training, and after-sales support?

Jwell Trusted By

Why Choose Jwell

Get A Free Quote

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