Cold storage sliding doors are insulated door systems engineered for refrigerated and freezer rooms where maintaining stable internal temperatures from -40°C to +10°C is critical. The door leaf is a composite sandwich panel with pre-painted galvanized steel or AISI 304 stainless steel skins at 0.4-0.7mm thickness, bonded to a high-density polyurethane (PU) foam core.
The PU foam core delivers superior thermal resistance with a density of 40-45 kg/m³ and thermal conductivity of ≤0.022 W/(m·K), minimizing heat gain through the door leaf. Door thicknesses of 80mm, 100mm, 120mm, and 150mm correspond to increasing R-values from R-20 up to R-38, allowing specifiers to match the door to freezer, chiller, or cold room duty.
Standard single-leaf doors reach clear openings up to 2,900mm wide by 3,500mm high, with double-leaf configurations available for larger forklift and pallet traffic. The heavy-duty top rail with reinforced ball-bearing rollers supports smooth horizontal sliding under intensive daily use, while anti-fall and overrun protection ensure safe manual or motorized operation.
These insulated sliding doors serve walk-in freezers, blast freezers, cold chain logistics hubs, food processing plants, and pharmaceutical cold rooms. Sealing is achieved through single or double EPDM gaskets with optional self-regulating heating elements in the frame, threshold, and gasket to prevent frost buildup and maintain airtight closure at deep-freeze temperatures.
Your Trusted Manufacturer for Cold Storage Sliding Door
RaxPanel is a direct manufacturer of cold storage sliding doors based in Hebei, China, with since 2002 of continuous production experience. Our in-house R&D, foaming, and assembly capabilities deliver consistent insulation performance, sealing integrity, and sliding precision for cold chain facilities operating worldwide.
With a daily production capacity exceeding 1,700 m² and exports to more than 30 countries and regions, RaxPanel combines scale with strict quality control to meet HACCP hygiene and cold chain standards. Every door undergoes verified lamination and hardware testing to support reliable low-temperature operation over a long service life.
- In-house PU foaming and lamination under controlled temperature, ensuring consistent core fill and bond strength across every door leaf.
- Heated frame and gasket channels integrated during assembly, verified under simulated low-temperature conditions before packing to prevent on-site frost sealing failures.
- Door leaves shipped with pre-cut gasket channels and drilled mounting points per project drawings, ready for installation following our technical guide.
| Parámetro | Valor |
|---|---|
| Material del revestimiento | Pre-painted galvanized steel / AISI 304 stainless steel |
| Espesor de Chapa | 0.4-0.7 mm |
| Material del Núcleo | High-density PU / PIR foam |
| Densidad del núcleo | 40-45 kg/m³ |
| Thermal Conductivity | ≤ 0.022 W/(m·K) |
| Door Thickness | 80 / 100 / 120 / 150 mm |
| R-Value | 80mm: R-20; 100mm: R-25; 120mm: R-30; 150mm: R-38 |
| Max Clear Opening | Single leaf up to 2,900 mm × 3,500 mm |
| Sliding System | Heavy-duty top rail with reinforced ball-bearing rollers |
| Seal System | EPDM gaskets with optional heating frame and heated threshold |
| Operating Temperature | -40°C to +10°C |
| Operation | Manual or motorized with anti-fall protection |
| Acabado superficial | RAL 9002 or customized powder coating |
| Compliance | HACCP-compatible hygienic surfaces |
Cold Storage Sliding Door Buying Guide & FAQ
A cold storage sliding door is the weakest point in an insulated envelope: it is the one place where the thermal barrier opens thousands of times a day. Getting the core thickness, frost protection, and sliding hardware right determines both energy cost and door service life. The guide below walks through the decisions cold-chain operators and food-processing engineers face when specifying insulated sliding doors for low-temperature rooms.
Pro Tip: Match Door Core Thickness to Delta-T
A 35°C temperature differential demands at least 100 mm of PU core to keep the outer skin above dew point. Thinner cores cause exterior condensation, ice on the gaskets, and compressor overwork. Always verify the door U-value against the room design temperature, not just the panel datasheet.
A 35°C temperature differential demands at least 100 mm of PU core to keep the outer skin above dew point. Thinner cores cause exterior condensation, ice on the gaskets, and compressor overwork. Always verify the door U-value against the room design temperature, not just the panel datasheet.
1. How do core thickness and U-value map to the room temperature?
The door core must be thick enough that its exterior face stays above the local dew point, otherwise condensation forms and freezes on the outside of the door. Because the door is opened repeatedly, it also dominates the room’s infiltration heat gain, so a low U-value directly reduces compressor load. The table gives typical starting points for a PU core of 40–45 kg/m³ density.
2. How are frost and ice kept off the frame and gaskets?
Where a cold leaf meets a warm frame, the metal edge becomes a thermal bridge that drops below the dew point and collects ice. Left unchecked, the ice bonds the door to the frame and tears the gasket on the next opening. The standard remedy is a self-regulating heating cable routed through the frame, threshold, and gasket channel, paired with a thermal-break profile that separates the inner and outer frame halves. Multi-lip EPDM seals then hold an airtight closure so moist air cannot reach the cold surface in the first place.
Heated frame checklist
Confirm the heating circuit covers the threshold as well as the jambs — the sill is where meltwater refreezes first. A self-regulating cable adjusts its output to local temperature, so it cannot overheat a section that has warmed up, which makes it safer than a constant-wattage trace.
Confirm the heating circuit covers the threshold as well as the jambs — the sill is where meltwater refreezes first. A self-regulating cable adjusts its output to local temperature, so it cannot overheat a section that has warmed up, which makes it safer than a constant-wattage trace.
3. What sliding hardware suits the traffic and opening size?
The rail, hanger, and guide track carry the full leaf weight and set how smoothly the door runs over years of use. Single-leaf doors serve personnel and pallet access up to roughly 2,900 mm clear width; beyond that, a double-leaf (bi-parting) layout keeps each leaf light enough to slide reliably while maximizing the opening for forklift traffic. Manual operation is dependable for low-frequency doors, whereas motorized drives with radar or push-button activation reduce open time and cold-air loss on busy logistics doors and add obstacle detection for safety.
4. Which skin material should the door carry?
The skin has to survive humidity, impact from trolleys, and frequent chemical washdown. The choice usually comes down to prepainted galvanized steel for cost-sensitive rooms and stainless steel for demanding food and pharmaceutical environments.
5. ¿Cómo aporta la puerta al cumplimiento de la higiene y la estanqueidad?
En las salas de alimentación y farmacéuticas, la puerta debe mantenerse limpia y estanca durante toda su vida útil. Las caras de acero inoxidable sin juntas ni resaltes, con esquinas redondeadas, eliminan los salientes donde se acumulan bacterias y hielo, lo que apoya los regímenes de limpieza HACCP y GMP. Una junta de compresión continua alrededor de los cuatro bordes mantiene baja la fuga de aire, lo que a su vez conserva la temperatura de la sala y limita la carga de humedad que de otro modo se congelaría en las superficies frías.
Frequently Asked Questions
¿Qué espesor de puerta necesito para un congelador a -40°C?
Para las cámaras de congelación profunda a -40°C, especifique un núcleo de PU de 120–150 mm para mantener el revestimiento exterior por encima del punto de rocío y controlar las ganancias de calor. Las cámaras frigoríficas por encima de 0°C se benefician bien de núcleos de 80–100 mm, que equilibran el coste inicial con el coste de funcionamiento.
¿Cómo se previene la acumulación de escarcha y hielo en la puerta?
Cables calefactores de autorregulación recorren el bastidor, el umbral y la ranura de la junta para mantener esas superficies por encima del punto de rocío, mientras que las juntas de EPDM multilabio aseguran un cierre estanco. Juntos impiden que el hielo adhiera la hoja al bastidor durante el funcionamiento continuo en congelación profunda.
¿Debo elegir una puerta de corredero manual o motorizada?
La operación manual es fiable para puertas de personal y de palets con poco tráfico. La corredera motorizada con activación por radar, botón o lazo de inducción se adapta a las aperturas logísticas de alto tráfico, reduciendo el tiempo de apertura y la pérdida de aire frío, además de ofrecer detección de obstáculos y liberación de emergencia.
¿Por qué especificar revestimientos de acero inoxidable para una puerta de cámara frigorífica?
El acero inoxidable AISI 304 resiste la humedad, los productos químicos de limpieza y la sal presentes en las plantas de alimentación y mariscos. Su superficie no porosa cumple con los requisitos de enjuague HACCP y permanece lavable tras miles de ciclos de limpieza, extendiendo su vida útil en entornos agresivos de cadena de frío.
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