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Motorcyclists & Motorsport enthusiasts, buckle up for a compelling journey that unveils the crucial link between helmet safety and your passion for adrenaline. We shed light on the specific risks you face, and the devastating consequences of Traumatic Brain Injuries (TBIs), & present an innovative solution to fortify your protection.
Welcome to The Helmet Doctors, where we strive to empower you with the knowledge and tools to ensure a safe and exhilarating ride/drive every time knowing your helmet’s structural integrity is in optimal condition.
Below and the following stories we will brief you on the areas:
But now let’s look at …
Manufacturing Of Motorcycle Helmets –
The Inner Shell: EPS Liner
EPS foam liners are generally made by injection moulding. The mould for an EPS helmet liner typically consists of a core and cavity with the gap between them defining the shape of the helmet. The core is hemispherical in shape and roughly modelled to match the shape of the top of the human head (Shuaeib et al. 2002b). During the pre-expansion stage, raw polystyrene particles are inserted into a large cylindrical tank which is heated by a heat transfer fluid.
The material in the tank is wiped by internal blades which contact with the heated tank walls. Hot air is used to pressurise the tank for a pre-determined time to cause the polystyrene to soften uniformly without expansion. A vacuum is then applied to the tank and the material is allowed to expand to the desired density (Shuaeib et al. 2002b). Pentane gas is also removed from the tank at this stage.
Following pre-expansion, the pressure inside the tank is returned to atmospheric and the material is discharged to the holding bin. Figure 3 on our website shows the typical pre-expansion equipment. While the material is still hot, it is fed directly from the holding bin into the mould. Feeding these foam beads, with a blowing agent such as hot air or superheated steam, into the mould and venting it causes additional expansion and forces the beads to conform to the shape of the mould and bonds the beads together. The mould is then cooled which allows the EPS to stabilise. The core and cavity are then separated, leaving the EPS helmet liner attached to the core.
The liner is then ejected from the core by a jet of air channelled into the core or by an ejecting pin which pushes the liner from the core. This ejection must be carefully executed to ensure the liner is not broken in the process. The core of the mould is usually coated with a release agent such as Teflon, to facilitate the removal of the liner (Sibley and Ponzer 1994). The advantages and disadvantages of manufacturing EPS foam liners for motorcycle helmets are outlined in Table 3 on our website.
Advantages
Disadvantages
For more content or illustrations, head to our website, or check out our FAQ. To reference our article to your friends, or family, in the Motorcycling/Motorsport community, click the link below or simply copy this URL or bookmark the page for future referencing: https://thehelmetdoctors.com/contact-us-helmet-protection-motorcycle-safety-course/. Otherwise read our next article about Finding reliable information about helmet safety & brain injury prevention?, titled “Helmet Secrets Laser Tech Saves Lives”
“Our motorcycle safety course in helmet protection”
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