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We build portable icebox lines whose shells survive a 1.5 m drop on concrete — rotationally moulded, blow-moulded or injection-moulded ABS — with 42–48 kg/m³ PU cores for WHO PQS vaccine and medical cold-chain use. Tooling, foaming line and drop-test protocol from one supplier, for 10L – 600L coolers in outdoor recreation, vaccine transport, marine and fishery.
In one line
Proven on vaccine-transport cold chain — insulation performance certified down to 5-day passive hold at +40°C ambient.
- Outdoor gear brands
- Vaccine / blood cold-chain logistics
- Marine & fishery
Real Pains We Hear from Buyers — and What We Ship to Solve Each One
Four pains every portable-icebox factory founder brings us. Our line ships with the fix.
Outer shell drop-test fails — 1m drop cracks the rotomold or warps the corner
Drop-test failures cluster at the corners. Our rotomould tooling uses reinforced corner geometry + LLDPE-grade resin with impact-modifier blend. Shell wall thickness 3–6 mm uniformly. The rotomoulded LLDPE shells produced from the moulds we supply pass a 1.5 m drop on concrete with no cracking, including marine/fishery models on offshore deck. Injection-moulded ABS parts are a separate case: in high-impact grade with thickened corners they pass the same 1.5 m drop at room temperature, but impact strength falls off below 0°C, so we keep ABS to handles, latches, hinges and panels rather than frozen-payload shells.
Cooler holds ice 48 h on spec sheet but customers complain it melts in 24 h in real use
Real-world ice retention depends on PU foam k-factor, wall thickness, AND seal integrity — most factories miss the seal. Our line ships with a gasket seal compression test on every unit; foam wall thickness 30–80 mm with even fill; lid latch gives 35–50 N closing force. Field-measured ice retention: 5-day spec → 4.5–5 day actual (90% spec retention).
Plastic vs roto-foam vs PU-injected — buyer wants all 3 formats but I have no idea which moulds to buy first
Roto-foam is the volume sweet spot (60% of US/EU market). PU-injected is premium. Pure plastic is budget. We recommend starting with roto-foam tooling (USD 280K covering 4 SKUs across 30L–250L), then adding PU-injected tooling (USD 180K) once volume justifies it. Pure plastic line is a separate platform — usually not worth running on the same floor.
Pelican / Yeti-grade premium positioning needs perfect lid latch + carry handle — my latches break in field
Premium iceboxes win on hardware. Our line includes factory-fitted Sugatsune-grade stainless latches (200,000-cycle rated) + reinforced handle mount + lid hinge with corrosion-resistant pin. Pre-shipment QC tests every latch through 50 open/close cycles. Premium positioning vs commodity iceboxes adds USD 80–250 wholesale per unit.
İhtiyacınız Olan
Hardware & Accessories — Bundled with Main Equipment Orders
Complementary hardware fabrication service — supplied alongside our main equipment orders (moulds / PU foaming / production line). Custom-fabricated per your drawings: 5 categories — hinges, brackets, rails & ladders, wire shelves & baskets, grid panels. Not a standalone product line. Consolidated into your main shipment.
Daha Fazla Bilgi
PU Foaming Line for Insulation Box Production
PU foaming module (machine + jigs + recipe) for factory owners building insulated transport boxes 10L–600L — vaccine cold-chain, meal-kit delivery, seafood export. Jig count sized to your daily output (50–2,000+ boxes/day). k=0.022 W/m·K, WHO PQS-ready recipe. Vacuum-forming + assembly + QC are your scope — we supply the BOM.
Daha Fazla Bilgi
yongjiapu.com
Low-Pressure PU Foaming Machine
Smaller, more flexible machine for wine cabinets, mini-bars, vaccine boxes and R&D pilots. Quick recipe switches when you run dozens of small cabinet variants. 5–250 g/s output.
Partner Sitesinde Gör
PU Raw Materials System
We make refrigerator-grade PU systems — polyol blend, MDI, blowing agent, all formulated in our own plant. k-factor down to 0.018, density customizable, tuned to your cabinet and your line.
Daha Fazla BilgiFrom inquiry to first commercial unit — the 6-step delivery flow
From inquiry to first portable icebox off your line. ~8 months for a 1,000 units/day icebox line.
- 1
Inquiry & Format Mix Scoping
Week 1–2Share target capacity, format mix (roto-foam / PU-injected / pure plastic), size range (20L–250L), target markets (US/EU camping, Vietnam/Chile fishery, Saudi/UAE outdoor). 1-page proposal in 5 days.
- 2
Detailed Proposal & Format Strategy
Week 2–4Engineering picks rotomould vs PU-injected mould platform based on volume target. Sized for 4–6 SKUs across the icebox range. Latch + handle hardware sourced from Sugatsune / Hettich network. Quote with 14-line BOM in 10 days.
- 3
Contract & Shell Design Freeze
Week 4–630% down. Shell CAD + corner reinforcement geometry + lid latch interface frozen. Marine/fishery models get extra UV/saltwater spec sign-off.
- 4
Rotomould + PU Insert Build
Month 2–5Rotomould tooling: 45–60 days. PU foam injection tools: 30–45 days. Lid latch + hinge assembly station: 30 days. Pre-shipment drop test on trial units.
- 5
Sea Freight & On-Site Installation
Month 5–73–4 × 40' containers from Shanghai/Ningbo. On-site installation 2 weeks. Rotomould burners + ovens commissioning critical here.
- 6
Commissioning, Drop-Test & Acceptance
Month 7–8First 50 trial iceboxes per format produced and drop-tested (1.5 m on concrete). Ice-retention validation on representative units. Operator training. Acceptance signed when 30 consecutive units pass drop + ice-retention spec. 60% payment due here.
Why This Line Works — Backed by the Real Specifications
Foaming-line know-how transferred from vaccine-transport tooling — your buyers in outdoor, medical, and marine all benefit.
Insulation core engineered for 5-day passive cooling
60–80 mm PU foam wall (vs. standard 40–50 mm) holds vaccine temperature ±1°C for 5+ days passive — the WHO PQS benchmark. Same tooling produces outdoor coolers that hold ice 4–7 days vs. competitor's 2–3 day standard.
Rotomold + foaming hybrid platform
Outer rotomolded shell (LLDPE for marine UV resistance) + PU foam insulation core + inner liner. We supply the foaming moulds and insulation-box production line; rotomolding tooling sourced from our partner network. One-stop platform vs. coordinating 3 separate suppliers.
Capacity 10L to 600L on modular tooling
Mould platform covers 10L lunch coolers through 600L marine-fishery iceboxes on the same line backbone. Outdoor brands typically launch 5-tier collections (small / picnic / weekend / camping / marine) — one tooling investment covers the whole range.
Vaccine cold-chain compliance pathway
Foaming density spec'd to 42–48 kg/m³ for vaccine transport, with WHO PQS pre-qualification testing documentation pathway provided. We supply the equipment to specifications — the brand obtains WHO PQS certification with their accredited testing lab.
Customization Options
Portable icebox segments split by use case. 4 axes adjust for outdoor / fishery / vaccine / medical positioning.
Format & process
Roto-foam (60% market, 4-SKU base mould USD 280K) / PU-injected (premium, +USD 180K) / pure plastic (separate platform).
Shell material
LLDPE (UV/saltwater for marine), HDPE (impact for outdoor), reinforced-corner geometry for 1.5 m drop test on concrete.
Insulation spec
Foam wall 30–80 mm. PU formulation tuned for ice-retention 24h / 48h / 5-day target.
Hardware grade
Sugatsune 200K-cycle stainless latches for premium positioning (Yeti-grade), or commodity hardware for entry segment.
Foam Quality Visualization — what closed-cell structure actually looks like
The single biggest predictor of refrigerator cabinet thermal performance is the foam cell structure. Closed-cell ratio, average cell diameter and density uniformity decide whether your cabinet holds -18°C in 35°C ambient — or fails the EU Ecodesign type-test. Here's what fine and coarse PU foam look like under a scanning electron microscope.
Industry-typical low-grade PU
- Avg cell diameter
- ~400 µm
- Closed-cell ratio
- 85–90%
- k-factor (W/m·K)
- 0.025–0.028
- Density uniformity
- ±5 kg/m³
Visible voids, broken cell walls, large irregular cells. Refrigerator cabinet pull-down test fails at 32°C+ ambient. EU Ecodesign type-test fails first submission.
Our cyclopentane PU system
- Avg cell diameter
- ~100 µm
- Closed-cell ratio
- ≥95%
- k-factor (W/m·K)
- 0.019–0.021
- Density uniformity
- ±0.5 kg/m³
Uniform fine cells, intact walls, high closed-cell ratio. Refrigerator cabinet pull-down test passes at 43°C tropical ambient. EU Ecodesign / WHO PQS / ENERGY STAR first-submission pass rate 90%+.
How we measure it: Every shipment of PU raw materials runs through pilot foaming + SEM cell-structure check at our lab. Every commissioned line gets a foam parameter card with these targets — if your operators tune to the card, the foam structure stays in this range. Sample reports available on request.
Illustration · Conceptual SEM micrographs representing typical industry coarse foam (left) vs UREXCEED cyclopentane PU foam quality target (right). Real SEM reports from your specific line available after commissioning.
Application Scenarios
Portable iceboxes cover outdoor, fishery, cold-chain and medical use.
- Outdoor camping cooler (Yeti-grade, 30–100 L)
- Fishery icebox (marine-spec LLDPE 250–600 L)
- Vaccine / blood cold-chain box (passive 24-48h retention)
- Beverage cooler for events / catering (commercial 60 L)
- Soft cooler / lunch box (commodity 5–20 L)
- Pharmacy cold-chain shipper (regulated transport)
Questions factory owners ask us
Can injection-moulded ABS parts pass a 1.5 m drop test?
Which shell process do you recommend for medical / vaccine iceboxes?
Do you provide the drop-test report with the tooling?
What's the typical investment for a portable icebox production line?
Can you produce active-cooling iceboxes (12V DC powered)?
Do you support EVA-foam outdoor coolers (lower-cost alternative)?
What's the lead time for vaccine-cold-chain qualified iceboxes?
Can you supply tooling for marine / fishery iceboxes specifically?
Optional Add-ons
Extend Your Production Line
Five proven add-ons our 1,800+ customers ask for after their first refrigerator factory line goes live. Discuss with our engineers which fit your spec.
Raw Material Supply
PU MDI / Polyol systems sourced direct from BASF / Covestro / Wanhua, calibrated to your foam specs and climate. Container-load discounts.
Spare Parts Package
2-year wear-parts package — seals, valves, heating elements, sensors. Pre-shipped with the line, no air-freight emergencies.
Robot Integration
ABB / KUKA 6-axis robot for de-molding, demoulding, palletizing or insertion of internal components — boost throughput +30%.
Automatic Demoulding System
Vacuum-assisted demoulding for thin-wall liners and complex geometries — eliminates worker injury, halves cycle time.
Quality Inspection System
Inline foam density, void, k-factor + dimensional QC stations. Auto-reject + traceability log — meets ISO 9001 + EU appliance regulation.
ROI · Cost Analysis
Investment Range & Payback
Indicative range based on 1,800+ delivered lines. Final pricing depends on automation level + add-ons + local labor cost. Request a quote for your spec.
Configuration note: Roto-foam tooling sweet spot: 4-SKU base + insulation foam line + Sugatsune latch assembly. Pure plastic line is a separate platform. Drop-test rig + ice-retention validation included.
Service & Support
Warranty & Service
On-site intervention available in every region where we have delivered projects.
On-Site Installation
Our engineers fly to your factory to supervise installation, layout verification, and first-run production.
Commissioning + Tuning
Trial run + parameter tuning to your local raw material, climate, and target product spec — until throughput meets contract.
Operator Training
5-10 day on-site training for production team, QC, and maintenance — bilingual manuals + video tutorials provided.
3-Year Warranty + Spares
Core equipment 3-year warranty, electrical 2-year. Spare parts in stock with global express shipment 24h dispatch.
Cross-Sell · One-Partner Synergy
Pair this line with the rest of the factory
The product groups our refrigerator-factory customers buy alongside this line — for full-line synergy and one-partner accountability.
High-Pressure PU Foaming Machines
Cyclopentane / 2-component / 3-component models. Cyclopentane is the refrigerator industry standard.
Learn moreRefrigerator-grade Moulds
Vacuum-forming moulds for inner liners + foaming moulds for cabinet/door. 30-year mould-cluster network.
Learn morePU Raw Materials System
BASF / Covestro / Wanhua MDI + Polyol — calibrated to your climate, foam density, and cycle time.
Learn morehome.stats.heading
Turnkey Production Lines for Refrigeration Equipment Factories
"From a Single Pump to a Turnkey Line — One Partner Through Every Tier."