Polyurethanes
Soft, resistant and stable
Polyurethane no-crush wheels are widespread on corrugating lines as well as on folder-gluers, and wherever you need to drive or guide the cardboard.
Decades of continuous R&D led our technical office to a proprietary formulation able to answer positively to all the features required to no-crush wheels in the cardboard industry:
softness to avoid signs on the paper;
grip power to drive cardboard;
heat resistance, up to the highest temperatures achieved in some points of the corrugating line;
resistance to hits, cutting, abrasion and wear;
hardness stability all throughout the lifetime of the wheels.
We regularly produce wheels included in the range between 40 and 80 shoreA, with a standard 60sh suggested as the best choice for all the most common uses in the cardboard industry.
The compression power and the other mechanic features depend not only on the formulation but also on the design of the wheels: ASTIN pays great attention to the project and the construction of the moulds.
No-crush wheels are usually identified after their measures, outside diameter and width above all; our moulds catalogue is made up of hundreds of references, with OD ranging from 50 mm to 380 mm.
The bore may be flat, to install the wheels by pressure on a shaft or on a bushing, or it may be suitable to host bearings.
Some wheels are directly vulcanized upon bearings, thus making a single body with them.
02. Feeding wheels, slotter rings, creasers
On a casemaker you can find polyurethane items in several crucial points:
feeding wheels must ensure resistance to wear and grip power, to keep great precision even at high production speed;
stitch-lap anvils must have great resistance to cut;
creasing anvil rings should adapt perfectly to their steel counterparts.
ASTIN takes advantage of its deep technical knowledge of machines to develop the right material and dimension for any single article.
03. Vulcanization, prototypes, custom-made parts
Our production department is flexible enough to take care of special request, custom-made parts and even single pieces, prototyping in dimensions and materials.
Considering the function of the part, we can choose a formulation with correct features (resistance to solvents or to other chemical products, resistance to heat, mechanic or chemical features, elastic memory), with an hardness ranging from 30 shA to 70 shD.