Wall Contact and Bacterial Transfer
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The "Under" Flaw (Position 1): When a roll is hung in Position 1, the loose end rests flush against the wall or tile. Every time a user reaches to grab the end, their fingers naturally brush against the wall, the surrounding tile, and the back side of the roll. If prior users reached for paper with unwashed hands, harmful bacteria—including Escherichia coli, Staphylococcus aureus, and norovirus—can linger on that surface. Subsequent users inadvertently deposit and pick up these pathogens, which are then wiped directly onto sensitive body parts.
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The "Over" Advantage (Position 2): When the roll hangs over the front, the paper forms an outward arc suspended in mid-air away from the wall. A user can cleanly pinch the dangling end without making contact with the wall, the dispenser bracket, or the surrounding structural materials. This minimizes cross-contamination and maintains sanitary margins.
In commercial environments, hospitals, and hospitality properties, cleaning guidelines almost universally mandate Position 2 specifically to comply with infection-control best practices.
3. Ergonomics, Visibility, and Dispensing Efficiency
Beyond hygiene, the basic physical mechanics of pulling and tearing paper heavily favor Position 2.
Visual Tracking and Grasping
In Position 2, the loose edge of the roll is immediately visible at eye level, hanging cleanly in open space. In low-light situations—such as late-night trips to the bathroom—identifying and grasping the sheet requires no searching. Conversely, in Position 1, the loose end often falls flush against the wall, slips down behind the core, or curls inward. Users are frequently forced to spin the entire roll with their palm or fumble against the wall just to find the start of the paper.
Friction and Tearing Dynamics
Perforated paper relies on tensile resistance across the perforations to tear cleanly. When pulling from the top (Position 2):
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Downward or outward pull creates leverage against the weight of the roll and the friction of the spindle.
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Users can use one hand to pin the roll and snap off the desired number of sheets cleanly.
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The rotational momentum of the roll works with the motion of the human hand moving outward away from the body.
When pulling from underneath (Position 1), pulling outward exerts force directly against the back wall, increasing drag and frequently causing the paper to tear prematurely before a full sheet or section is detached.
