An absorbent article may include a top sheet that is liquid-permeable, a back sheet that is liquid-impermeable, and an absorbent body situated between the top sheet and the back sheet in a thickness direction. At least one of the top sheet and the back sheet may include a synthetic resin sheet that includes a synthetic resin component and an oxidative decomposer comprising a mixture of a carboxylate and a rare earth compound. The synthetic resin sheet may contain the oxidative decomposer in a mass ratio such that a decomposition rate index (D.sub.i), as determined by formula (1), is 7.8 or less:
D.sub.i=B.sub.r×S.sub.a  (1)
where B.sub.r represents a mass ratio (g/g) of the oxidative decomposer with respect to the synthetic resin component, and S.sub.a represents a specific surface area (cm.sup.2/g) of the synthetic resin sheet.

Herein is disclosed a biodegradable absorbent article having a natural fiber cake which may include a mixture of plant fibers and plant pulp, such as from a banana plant, and in embodiments, includes an absorbent article having a permeable top sheet; a natural fiber cake that may be derived from plant material such as the banana plant; a water-insoluble back sheet; and an optional superabsorbent polymer, and wherein the absorbent article may be used for many purposes such as a sanitary napkin or urinary incontinence pads.

Disclosed is biodegradable underwear having side fastening and unfastening means, wherein the biodegradable underwear is possibly coupled with a biodegradable sanitary napkin, a sensor or both. Disclosed also is a biodegradable sanitary napkin comprising a sensor. Further disclosed is biodegradable underwear comprising a belt and a biodegradable garment.

An absorbent article may include a top sheet that is liquid-permeable, a back sheet that is liquid-impermeable, and an absorbent body situated between the top sheet and the back sheet in a thickness direction. At least one of the top sheet and the back sheet may include a synthetic resin sheet that includes a synthetic resin component and an oxidative decomposer comprising a mixture of a carboxylate and a rare earth compound. The synthetic resin sheet may contain the oxidative decomposer in a mass ratio such that a decomposition rate index (D.sub.i), as determined by formula (1), is 7.8 or less:

D.sub.i=B.sub.rS.sub.a (1)

where B.sub.r represents a mass ratio (g/g) of the oxidative decomposer with respect to the synthetic resin component, and S.sub.a represents a specific surface area (cm.sup.2/g) of the synthetic resin sheet.

Herein is disclosed a biodegradable absorbent article having a natural fiber cake which may include a mixture of plant fibers and plant pulp, such as from a banana plant, and in embodiments, includes an absorbent article having a permeable top sheet; a natural fiber cake that may be derived from plant material such as the banana plant; a water-insoluble back sheet; and an optional superabsorbent polymer, and wherein the absorbent article may be used for many purposes such as a sanitary napkin or urinary incontinence pads.

A sanitary absorbing construction to be used by children and infants to hold and restrain liquid and solid dejections, which article is conventionally called napkin, of a single-use or disposable kind, made by combining different raw synthetic or natural materials, comprising apple waste materials, being industrially transformed into composite sub-layers which are assembled together to form articles having different shapes depending on technical or aesthetical requirements, and being biodegradable either before or after their use, when released into the environment, and being compostable or able to be transformed to into organic amending materials, when properly collected and separated or mixed with other organic domestic waste materials and then let into the compost cycle, per se or together with organic waste materials either from foodstuff or not.