There’s a certain disappointment in the feeling of stepping out of your warm bath after wrapping yourself in a towel that acts like stiff paper more than a plush luxury item. Our first thoughts might go toward the poor quality of the cotton used or its age, but usually, it’s the way we care for our clothes that is to blame. The attempt at achieving perfection in drying everything completely takes us one step closer to altering our clothing on a molecular level.In essence, the physics that makes a towel soft and luxurious is all about proper moisture content. Cotton threads at their best of their game should be elastic and resilient, while excessive processing results in damage to the material. Understanding the reasons for a towel becoming stiff will help keep those expensive linens in great condition and restore their luxurious feel without hiring professionals.Physics of the stiff cotton fibreIt seems contradictory, but overdrying is to blame for that loss of softness. What is interesting is the fact that even the tiniest amount of water keeps cotton fibres soft and elastic. The research Effect of drying on the viscoelastic response of a dual-crosslinked PVA hydrogel shows a very relevant principle – the idea that water functions as a natural plasticiser, making the molecular chain in the fabric more mobile.Once the towel dries up completely, causing all water molecules to evaporate, the threads become tightly arranged. The lack of moisture means that there is nothing to cause these fibres to move around, hence becoming straight and stiff. This leads to the development of a rigidity that causes the fabric to become harsh on the skin. Tests have confirmed that as the degree of hydration reduces, materials tend to harden quite a lot. In such a scenario, the threads may end up being hardened beyond repair.
To maintain softness, avoid complete drying; opt for a “just dried” state or use moisture sensors. Line drying can be harsh, but a brief tumble dry without heat can help.
It’s not just how well you wash your towels but also how you dry them. The thought of drying towels naturally in sunlight might appeal to some people. However, according to the International Journal of Clothing Science and Technology, line drying is much harsher on your towel’s softness than tumble drying. Lacking the gentle agitation process of tumbling, wet fibres tend to clump as they dry, leading to a tough, cardstock-like quality.Effective towel laundering tips for softnessIf you don’t want to ruin the feel of your towels, rethink your drying strategy. Rather than insisting that towels must be completely removed from the dryer, focus on a “just dried” state. If your machine has moisture sensors that automatically shut off the dryer once the humidity drops, use this function. Otherwise, stop the cycle a few minutes early – ten minutes should do fine. Drying your towels before they get hot allows residual moisture to evaporate slowly.In case you are committed to line drying for the sake of the planet, an expert recommendation for a hybrid approach may be useful. Towels should be spun dry in a clothes dryer for five minutes without heat. The mechanical process will break down the strong bond that is formed due to air drying. Moreover, studies have shown that fabric softener can reduce the abrasive feel of air-dried towels through sound spectrum analysis.The type of washer you use is another unexpected element. Based on sound spectra studies, a front loader might be rougher on your towels’ softness than a top loader due to the manner in which they wash. However, you can overcome this by avoiding overloading your washer, as that will make it harder for the washing machine to rinse your towels completely, leaving them with a rough residue.
