NDW Intern-Transportonderdelen: transportrollen / draagrollen


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Tubes; material specifications Steel tubes
Material Tolerance Quality Straightness	welded steel precision tube made from hot-band steel, with/without weld seam filed away according to DIN 2394 St.37.2 according to DIN 17100 according to manufacturer approx. 0.25% van the measured length

Load diagram for steel tubes - statically evenly distributed load - maximum curvature of 0.5 mm in the middle of the tube - maximum permissible material tension 120 N/mm² - for RL =< 300 mm, the material tension is the determining factor and for RL => 300 mm the curvature - for a point load, for example in pallet transport, the load capacity shown in the diagram should be multiplied by a factor of 0.6 - for stainless steel tubes, you should allow for a safety margin because of the lower load capacity

Steel tubes diagram

Stainless steel tubes
Material Tolerance EUR material code number Straightness	welded stainless steel precision tube (AISI 304) according to DIN 2463 D2/T3 1.4301 according to manufacturer, approx. 0.2% van the measured length

Steel tube galvanization
Galvanization method Zinc layer	electrolytic for indoor use 5 to 8 µm, for outdoor use 12 to 15 µm (on request) galvanization takes place after the tube has been worked on, due to the quality requirements

Steel tube fitted with PVC hose The PVC hose is blown around a tube with compressed air. The aim of this is mostly to protect the product to be transported against damage, to achieve more grip for transporting the product or to prevent inappropriate materials from sticking to the roller.
Material Material thickness Temperature range Resistance to weathering Resistance to UV Colour	soft PVC, hardness ± 70° shore standard stock 3 or 5 mm -30°C to + 70°C good fair grey (RAL 9006)

Steel tube fitted with PVC or rubber covering The PVC or rubber covering is glued onto a sanded tube. The seam will be sealed closed where possible. The purpose of the covering is to protect the product to be transported against damage, to achieve more grip or to prevent inappropriate materials from sticking to the roller. There are lots of sorts of PVC and rubber coverings, each with specific characteristics. We will be glad to advise you and help find the best possible solution for your particular situation. Or look in the section on Covering.

Powder coated steel tube In powder coating a polyester coating is applied to the tube by means of an electrostatic charge. The whole object is then heated to ± 200°C in a curing oven, causing the powder particles to melt and flow together into a single homogenous covering layer. This is done to prevent rusting.
Characteristics Layer thickness Colour Temperature range Resistance to weathering Resistance to UV Outdoor use	impact and scratch resistant, long-lasting, easy to clean and environmentally friendly from 60 to 150 µm standard is mid grey, but can also be delivered in all other RAL colours -10°C to 70°C without risk of discolouration (short periods up to 150°C) good extremely good for outdoor configurations, we recommend two layers or a galvanized underlayer

Rilsan-coated steel tube Rilsan coating is the application of a layer of Super polyamide 11 on a tube that has been sanded and brought to a high temperature. This creates a tough, flexible, impact resistant, hardwearing and corrosion resistant layer. Rilsan coatings are used primarily when the roller is to come into contact with foodstuffs and drinking water.
Layer thickness Colour Temperature range	between 300 and 600 µm MAC 5161 (mid grey) - 65°C to 100°C (short periods up to 140°C)

Teflon-coated steel tube Teflon coating is the application of a covering layer of fluorocarbon on a finely sanded steel tube. Depending on the end use, this can be based on PTFE, FEP or PFA. The result is a layer that very little sticks to and that is moreover chemically near enough inert. Fluorocarbon coverings are primarily used for "non-stick" and chemically resistant coverings. They are mostly used in the foodstuffs, drinks + tobacco, pharmaceutical and chemicals industries.
Layer thickness Colour Temperature range	at least 35 µm normally black -50°C to 280°C

Plastic tubes
Material Temperature range Resistance to weathering Resistance to UV Colour Straightness	extruded chip-proof and impact resistant hard PVC -10°C to 60°C good fair to good blue (RAL 5005) or grey (RAL 7030) 0.25% of the measured length

Load diagram for plastic tubes - statically evenly distributed load - maximum curvature of 0.5 mm in the middle of the tube - E = 1500 N/mm² (the calculated values have been cut off at a given maximum, since no guarantees can be given at higher loads) - point loads should be avoided - if a point load cannot be avoided, the load capacity given in the diagram should be multiplied by 0.6 - permanent distortion can occur with static loads

Rule of thumb Don't use a tube in a roller where the length is greater than 12x the diameter. This is because the roller may then tend to sag due to its own weight.