Understanding the Basics of Disposable Hygiene Adhesives in the Core System

Core System Adhesive Basics

Cores are a hot topic in the disposable hygiene industry. Leak prevention. Performance and integrity. To be or not to be fluff free. Channels or no channels. 

Staying up to date on the latest industry trends and discussions if critical. The following provides an overview of the core system, its components and the key role adhesives play in helping hold everything together.

Adhesives

Adhesives promote core integrity by bonding components together. They are essential to preventing core shifting, supporting absorbency, providing structure, and stabilizing the fluff and superabsorbent polymer (SAP) matrix

Topsheet

This layer of the core system makes direct contact with the wearer’s skin and enables the acquisition of fluid. Adhesives are applied to the topsheet to help prevent core shifting that could compromise absorbency and core integrity.

Acquisition Distribution Layer (ADL)

The ADL is designed to improve fluid management. It creates a space beneath the topsheet to and the fluff/SAP core matrix to help keep skin dry and minimize leaks during rewet. Adhesives help anchor the ADL to the topsheet and core matrix.

Core Wrap

The primary function of the core wrap is to maintain core integrity during processing by containing the fluff/SAP matrix. Adhesives are used to seal the core wrap and bond adjacent materials to prevent shifting.

Fluff

Fluff is found at the center of the core, in a ratio with a SAP (i.e., 50/50 or 30/70). It is typically composed of cellulose from trees and helps with rapid absorption and distribution of fluid. Fluff also assists with core integrity and improves core matrix stability. Adhesives are used to stabilize the fluff/SAP matrix.

Superabsorbent polymer (SAP)

This polymer is usually combined with fluff to create the core matrix. While it absorbs and wicks fluid slowly, it can retain large volumes of liquid relative to weight, even under pressure.  Adhesives are critical to SAP stabilization when fluff is not used. 

Wetness Indicator

The wetness indicator is a functional adhesive that turns blue when wet. It is also a common feature in many disposable diapers today. 

Backsheet

The backsheet is a barrier that can be breathable or non-breathable. Adhesives are applied to the backsheet and help prevent core shifting and leakage during use.

With this basic understanding of the core system and the role of adhesives, you can add value to core discussions and be better positioned to use information shared.

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