Correlation Between Human Grip Strength Threshold And French Fries Box Wall Thickness
The correlation between human grip strength threshold and the thickness of French fries box wall is essentially a cross application of ergonomics and packaging design. From a physiological perspective, the grip strength threshold reflects the critical value of pressure applied by the palm, directly affecting the comfort and stability of the user's grip on the packaging. According to health research, the average grip strength for men around 40 years old is 43.5-49.5 kilograms, and for women it is 27-31 kilograms. However, the critical grip strength for elderly people decreases to 28.5 kilograms for men and 18.5 kilograms for women. This data provides basic parameters for packaging design: if the wall of the French fries box is too thin, users need to apply greater grip force to prevent slipping, which may exceed the ability range of the elderly or those with weaker hand strength; If the wall thickness is too thick, it may increase grip fatigue and reduce the user experience.
Taking the fast food industry as an example, the packaging size of common French fries needs to balance capacity and grip stability. For example, the packaging size of a medium sized cola (about 500ml) is 90mm × 59mm × 130mm, and the size of a medium sized french fries box is about 55mm × 55mm × 110mm. If E-corrugated cardboard (with a thickness of about 1mm) is used, its compressive strength needs to match the user's grip threshold: when the user grips with an average grip, the cardboard needs to have sufficient rigidity to prevent deformation, and the surface roughness needs to be treated with texture design or coating to reduce the slip risk feedback from the slip sensor. Experiments have shown that when grasping smooth objects (such as plastic cups), the slip threshold needs to be set to 0.05 to trigger the anti slip mechanism, while the threshold for rough objects (such as paper boxes) can be relaxed to 0.06. This principle also applies to the design of French fries boxes - if the surface of the box wall is too smooth, it is necessary to increase the thickness or optimize the material (such as using micro ribbed cardboard) to improve friction and reduce the grip threshold required by the user.
From engineering practice, there is a correlation between the diameter of packaging containers and the grip strength index. Research has shown that the optimal diameter range for containers needs to adapt to the physiological structure of the palm, avoiding excessive grip force dispersion or local pressure caused by too small a size. For example, the Burger King french fries box is designed with 8.5mm wide and 8cm long thick fries, and its packaging needs to be balanced with weight and grip stability through thickened walls (usually 2-3mm composite cardboard), ensuring that users can easily grip with a grip force of 25-30kg. This case confirms that the grip strength threshold and packaging thickness need to be dynamically adjusted through ergonomic testing to achieve a balance between functionality and comfort.
Zhejiang Dongou Printing Industry Co.,Ltd, the expert in French fried box production
