Developing a Custom Adhesive-Removal Sponge for a Wearable Product

H-O Products developed and validated a custom soap-impregnated sponge used to remove residual adhesive from a wearable product. H-O engineered the sponge-converting and impregnation processes, developed a Tyvek®-based packaging configuration, completed IQ, PQ and MQ activities, performed a production validation run, and coordinated transit and third-party testing.

BACKGROUND

A manufacturer of a specialized wearable product needed a convenient, repeatable way to remove residual adhesive from the wearable. Adhesive left behind can interfere with cleaning, handling, appearance, or preparation for the next use. A dry sponge did not deliver the cleaning performance required, and an uncontrolled amount of liquid created leakage, packaging, and consistency problems of its own.

The customer had a defined product need but no established manufacturing and packaging process. Four elements had to work in a controlled relationship: the sponge material, the soap-based cleaning formulation, the amount and distribution of that formulation, and the finished packaging system. Each one affected the performance of the completed product, so H-O developed the sponge, the impregnation method, and the package as one integrated system rather than three separate parts.

CHALLENGES

The project required more than sourcing a sponge and adding soap. H-O had to develop the finished product and the process used to manufacture it, which meant determining:

1. The appropriate sponge material and finished geometry, and how much soap-based formulation each sponge required.
2. How to distribute the formulation consistently without excessive leakage or loss.
3. How to package the saturated sponge using Tyvek, with a repeatable sealing process.
4. Which manufacturing variables required control, and how to validate the process for production.
5. How to verify performance through transit and third-party testing.

SOLUTIONS

H-O began by translating the cleaning requirement into measurable material and manufacturing criteria, evaluating the sponge’s density, thickness, cell structure, absorption characteristics, finished dimensions, and response to the soap-based formulation. The goal was a construction that could hold the required amount of formulation while still providing the physical characteristics needed to wipe adhesive from the wearable.

Development work covered sponge dimensions and surface area, absorption and retention behavior, required soap loading, distribution through the sponge, impregnation and dwell time, compression during manufacturing and packaging, leakage and liquid migration, finished-unit weight and consistency, and handling at the point of use.

H-O produced trial units and refined the process until the formulation could be applied and retained consistently, converting a cleaning concept into a controlled product specification.

The impregnated sponge then needed a customer-approved package incorporating Tyvek, and packaging a sponge that carries a liquid formulation brings its own problems: the sponge has to stay positioned, the package has to contain and protect the product, and the sealing area has to stay controlled through production.

H-O evaluated how the sponge, formulation, Tyvek component, adjoining materials, and sealing process interacted, working through package dimensions and internal fit, sponge orientation and placement, seal location and geometry, sealing temperature, pressure and dwell time, potential migration of soap into the seal area, package handling during manufacturing, seal consistency, resistance to tearing, puncture and compression, and performance through distribution.

The method was refined until the sponge could be enclosed and sealed repeatably without compromising product or package.

The sponge did not require sterilization, and the package was not represented as a sterile barrier system. It still required a controlled and validated packaging process: H-O had to demonstrate that the package could contain and protect the impregnated sponge, hold its integrity through transportation, and deliver the product in the condition the customer required.

Qualification therefore targeted soap-loading consistency, finished sponge conformance, packaging and seal performance, product containment, manufacturing repeatability, transit durability, and the customer’s functional requirements, addressing the product’s actual performance needs without attaching an unnecessary sterilization claim.

QUALIFICATION & VALIDATION

With the manufacturing and packaging processes proposed, H-O completed IQ, PQ and MQ activities under the customer-approved validation plan. Installation Qualification documented that the required manufacturing and packaging equipment was installed, configured and operating as intended, recording equipment information, setup requirements, calibration status, operating documentation, and other conditions capable of affecting product quality.

Performance Qualification demonstrated that the established process could repeatedly produce acceptable sponges under defined conditions, monitoring the important process variables and evaluating completed sponges and packages against approved acceptance criteria.

Manufacturing Qualification confirmed the overall system was ready for production, covering approved materials, work instructions, equipment settings, inspection methods, documentation, handling procedures, packaging controls, and production traceability.

H-O then completed a formal validation run using the intended production materials, equipment, personnel, procedures, settings and inspection methods.

It evaluated the full manufacturing sequence: receiving and controlling the sponge and packaging materials, converting the sponge to the required geometry, preparing and controlling the soap-based formulation, applying the specified amount, allowing the sponge to absorb and retain it, positioning the sponge within the package, sealing the Tyvek-based package, inspecting the completed unit, preparing finished products for shipment, and recording production and inspection results.

The run produced documented evidence that the complete process could consistently manufacture acceptable product under representative production conditions.

Completed products were submitted for customer-required third-party testing, giving objective verification that the finished sponge met the applicable functional, physical, packaging and performance requirements independently of H-O’s internal work.

The packaged product also underwent transit testing against the approved protocol, after which product and package were evaluated for package or seal damage, leakage, loss of formulation, sponge displacement, product deformation, damage to the Tyvek component, and any change affecting cleaning performance.

Transit testing confirmed the packaging system could protect the impregnated sponge through the expected distribution environment.

RESULTS

H-O turned the customer’s initial concept into a qualified, production-ready adhesive-removal product.

The program delivered a sponge designed for removing adhesive from a wearable, controlled loading of the soap-based formulation with repeatable distribution and retention, consistent sponge dimensions and finished-product characteristics, a functional Tyvek-based packaging configuration, completed IQ, PQ and MQ activities, a successful production validation run, independent third-party performance verification, transit-tested packaging, documented manufacturing and quality controls, and a process that supports ongoing production volumes.

The customer did not arrive with a completed manufacturing process. It arrived with a problem: residual adhesive had to come off a wearable product using a convenient, packaged cleaning component.

H-O helped determine the sponge construction, developed the impregnation process, engineered the packaging method, established manufacturing controls, executed qualification and validation, coordinated third-party testing, and brought the finished product into production — the difference between sourcing a material and developing a complete, validated product.

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