Side-Open Menstrual Pants

Panel design

The side panel must perform two contradictory functions:

• Hold securely during wear. The fastening must resist tension from leg movement, body weight shifts and fluid weight in the core.
• Release cleanly when pulled. The caregiver must be able to open the panel with one hand without tearing the chassis or spilling the core contents.

Common solutions include:

• Hook-and-loop (mechanical) fasteners. Reclosable, adjustable for fit, but higher cost and slightly bulkier at the hip.
• Adhesive tear tapes. Lower cost, slim profile, but single-use. The tape must release without leaving residue on skin or clothing.
• Hybrid systems. A permanent adhesive base with a releasable hook tab for micro-adjustment.

Fastening engineering

Specify the following for any fastening system:

• Peel strength. The force required to open the panel. Too low and it opens accidentally; too high and the caregiver cannot open it easily. A typical range is 3–6 N per 25 mm width.
• Shear strength. Resistance to sliding forces during wear. Higher than peel strength; typically 8–15 N per 25 mm.
• Cycle life. For hook-and-loop, how many open-close cycles before retention drops below acceptable limits. Important if the product is checked but not changed.
• Skin contact safety. Adhesives and hook materials must pass cytotoxicity and sensitisation testing if they contact skin.

Use cases

• Hospital maternity wards. Post-caesarean patients may find pull-up products too painful or difficult. Side-open allows nursing staff to change the product without lifting the patient.
• Aged care. Residents with limited hip mobility or contractures cannot step into pull-up pants. Side-open products are changed while the resident lies down.
• Disability support. Users with limited hand dexterity may be able to manage hook-and-loop tabs even if they cannot manage a full pull-up motion.

What to specify

• Fastening type (hook-and-loop, adhesive tape or hybrid)
• Peel and shear strength targets
• Reclosure cycle requirement (if hook-and-loop)
• Skin-contact safety test requirements
• Absorbency level and core specification
• Institutional packaging (bulk carton, individual wrap optional)

Where side-open products fail in use

• Tape failure on re-application. The dominant failure. Ask for open-and-close cycles, and for adhesion tested after the tape has picked up powder or moisture.
• Panel misalignment. Front and rear panels that do not line up when re-fastened leave a gap at the hip. Ask for alignment marks or a registration guide.
• Film tear at the tape anchor. The backsheet tears where the tape is pulled. Ask whether the anchor point is reinforced.
• Size assumed rather than measured. Ward stock is bought by range, so one size is asked to fit everyone. Ask for the fit range each size is intended to cover.

Writing the RFQ line

Side-open is bought for a different reason than a pull-up, so the specification looks different:

• Open-and-close cycle target, and the contamination condition used in the adhesion test
• Tape type (hook, adhesive or hybrid) and whether the anchor is reinforced
• Panel overlap and any alignment feature
• Size range, and the fit range each size must cover
• Packing: individual wrap or bulk, since ward use usually implies individual wrap

What the fastening system costs

The fastening is the cheapest-looking part of the product and one of the largest sources of complaints. Three options, three different failure modes:

• Hook and loop. Refastenable many times, which matters for carers. Costs more per unit, and the hook side can snag fabric or scratch skin if the landing zone is not positioned carefully.
• Pressure-sensitive adhesive tape. The cheapest option and the fastest to run. It holds once or twice; after that it picks up lint and stops sticking. On a product designed for repositioning, that is the wrong choice.
• Hybrid. A tape with a reinforced anchor: better cold performance and cleaner removal, at a cost between the two.

Test the adhesive cold if the product will be stored or shipped through a cold chain. Pressure- sensitive adhesives lose initial tack below roughly five degrees, and a tape that fails on opening is a return whatever the lab data says. Also confirm the tab is long enough to grip with reduced hand strength, because that is the user this design exists for.