Sectional Overhead Door

This range ofsectional overhead door is a great industrial door solution, and is often used inwarehouses and workshops as well as other industrial workplaces. Because ofhigh durability and reliability, our overhead doors are also widely used as theoverhead garage door.

Door Panels of the Sectional Overhead Door
Door panel construction
With the same construction as our polyurethanestructural insulated panels, the doorpanels for the sectional overhead door are made up of a polyurethanefoam core and two steel facings.
1. The Freon-free polyurethane foam provides the industrial insulated doorwith superior thermal insulation performance, and it offers enhanced durabilityand reliability as it is produced by continuous foam forming lines importedfrom Germany.
2. The facings for the door panel are 0.5mm thick steel sheet from Baosteel, and they are provided with two layers ofPE coating with thickness no less than 28um. Thus, our range of sectional overhead doors comes with great UVresistance and weather resistance, and won't fade within 15 years.
3. The inner PU foam core offers high bondingstrength and won't peel off from the steel facings. Also, it features high foamdensity up to 42kg/m³at least.
4. For convenient installation of the industrial overhead door,the door panel should be filled with steel strips for easy fixing of hinges andother types of door hardware. 
5. The door panel is specially designed to protect your finger from pinching.

Door panelspecifications
Heat transfer coefficient: K≤0.5W/m²°C
Foam density: ≥ 42kg/m³.
Working temperature: -20℃~ 90℃
Door panel thickness ≥40mm
Single door panel height: 500mm
Door panel fire rating: B1
Door panel wind load: 50kg/m² ~ 75kg/m²
(Note: The door panel wind load varies according to the width of the sectionaloverhead door. When the sectionaldoor width exceeds 5.5m,the wind load can be designed to be larger to ensure the strength of the entiredoor system. )
Colors: White-grey(RAL9010), light blue (RAL5015) and silver-grey (RAL9006)

Hardware of the Sectional Overhead Door
1. The wheel brackets for our overhead sectional doors are engineered from 4mm thick aluminum alloy. Arc shaped designmakes angle adjustment convenient and easy, and also prevents the generation ofstress. Aluminum alloy offers better corrosion resistance than galvanizedsteel, and also makes the wheel bracket suitable for use in extremely lowtemperatures.
2. The hinges for our sectionaloverhead doors are made using stainless steel. For extended service life of theindustrial door hinges, the hinge-installation places are strengthened by 20G steel plates.

Balancing System of the Sectional Overhead Door
This range of overhead industrial door employs an external torsion springbalancing system. The precision torsion spring guarantees great balance. Itallows users to manually lift a 4.0m*4.0m overhead door with a force of at most 220N, when the motorcannot work properly due to temporary power off.

Made of alloy-steel wire 60Si2Mn, the spring also undergoes phosphating treatment, and thus it features lowstress and long service time. Exactly speaking, the life cycle of the torsionspring exceeds 30,000 times.

MechanicalSafety Device of the Sectional Overhead Door
This range of sectional door is available with steel wire broken and springbroken protection functions.
These protection functions allow the industrial purpose insulated metal door to stop within 20cm when the steel wire or torsion spring isbroken.

Track of the Sectional Overhead Door
The track ofour overhead industrial doors consists of awall track and a wheel track. They are madeof 2.0mm thick galvanized steel plate from Baosteel, and the galvanizedcoating thickness is 200um.

The tracks are formed by advanced formingmachine and tube bender, thus the performance of track can be guaranteed andthe deviation is reduced. Thanks to the straight and smooth track, our sectional overhead doors can be lifted or lowered down with little noise and shake. Inaddition, imported spot welder and digital automatic temperature control systemalso help to ensure the junction is smooth and durable.

SealingSystem for the Sectional Overhead Door
In addition to bottom and top seals, the industrialdoor is also available with seals for both sides and between door panels. Allthese seals can be conveniently installed by inserting.
1. High quality EPDM rubber seals for the bottomside effectively prevent water invasion. After fixation, the bottom sealstightly cling to the door panel, and also contacts with the ground closely,which ensures good air tightness.
2. The side seals are fixed on the track.
3. The top sealing strip keeps close to the wall when the overhead door isclosed.

ElectricMotor of the Sectional Overhead Door
The industrial door motor is available withoverload protection due to the temperature-sensitive relay.
With lifting, lowering and stopping functions, thecontrol panel allows the door to move in a speed from 170 to 400mm/s.
Thanks to the low voltage push buttons, the dooroperator system is absolutely safe and of good quality.
Manual chain is also used as an option to operatethe door.

Safety Protection Unit of the Sectional Overhead Door
With the safety protection function, the door will be automatically lifted upif it is blocked during closing process, thus avoiding damages to workers orgoods.

Others
1. Performance
Our overhead sectional doors support runningsmoothly in track after installation and examination. The noise is about 50 dBand the air tightness could reach 2.5m³/hwhen the pressure is 50Pa.

2. Optionaldesign
A window of size 630*320 mm is optional for you to observe the situationoutside the workshop. It is made of high transparent double layer acryl, thusit can provide strong toughness and corrosion resistance. A pass door with sizeof 900*1850 mm isalso an option.

Fittings ofthe Sectional Overhead Door

Lifting Mode ofthe Sectional Overhead Door
The lifting mode varies according tothe size and top space of door. We could offer three types of lifting,including standard lifting, high lifting and vertical lifting. The balance inmiddle is needed for convenient installation and maintenance if highlifting or vertical lifting is used.