【For Hygiene Textiles and Nonwoven Fabrics】Maintains Antibacterial and Deodorizing Performance Even After 30 Washes｜Masterbatch Containing 40% Antibacterial Zinc Oxide

The company can develop formulations designed to maintain antibacterial performance even after 30 washing cycles. All processes are handled in-house, from the dispersion of functional powders and
resin formulation design to prototype production and evaluation.

Table of Contents

• Stable Supply in Thailand and Southeast Asia, with Technical Consultation Available in English and Vietnamese
• Specifications, Resins, and Production Lots for Antibacterial Zinc Oxide Masterbatch
• Analysis and Evaluation Capabilities Supporting Dispersion and Formulation Design Technologies
• Joint Development Process and Initial Prototype Consultation
• Frequently Asked Questions (FAQ)

■ Stable Supply in Thailand and Southeast Asia, with Technical Consultation Available in English and Vietnamese

When establishing local procurement channels for additives used in hygiene products and textile markets in Southeast Asia, businesses may face challenges related to supply chain stability and quality control systems.

RESINO COLOR INDUSTRY CO., LTD. utilizes the distribution network of Sakai Trading Thailand, a group company, to establish a supply system for functional materials in Thailand and neighboring
countries. This allows customers to procure masterbatches on a stable basis while reducing the burden of lead times and international logistics costs associated with importing products from Japan.

Accurate communication of technical requirements is also essential when discussing formulation design and dispersibility. Miscommunication with overseas operations may affect the time required for prototyping and preparation for mass production.

The company provides direct technical consultation in English and Vietnamese while coordinating with its technical department in Japan. By discussing and defining specifications from the product design stage, prototype and mass-production formulations can be developed smoothly in accordance with the customer’s required criteria.

Through cooperation among group companies, the company can also support the process from selecting inorganic functional fillers suited to the required performance through to additive formulation. This enables customers to consolidate development-related communication through a single point of contact and manage the prototyping process more systematically.

■ Specifications, Resins, and Production Lots for Antibacterial Zinc Oxide Masterbatch

Fiber materials used in hygiene products and nonwoven fabrics require particles fine enough for delicate spinning processes. They must also have good dispersibility so that the material’s functions are expressed uniformly, even in thin nonwoven fabrics or sheet-shaped molded products.

RESINO COLOR INDUSTRY CO., LTD. uses its proprietary dispersion technology to disperse nanoscale zinc oxide, which tends to agglomerate easily, uniformly and at high concentrations in the base resin while reducing secondary agglomeration.

■ Antibacterial and Deodorizing Performance and Available Specifications

※Silver based antibacterial products are also available as an alternative for PE and PP applications.

In fiber spinning processes, agglomerated additives may cause fiber breakage or filter clogging. The company’s dispersion material, with particles controlled down to the nanoscale, helps reduce the risk of filter clogging, fiber breakage, and inconsistencies in physical properties during the molding of ultrafine fibers and nonwoven fabrics.

The company also uses a masterbatch method in which antibacterial zinc oxide is incorporated directly into the fiber itself. Compared with post-processing coating methods, this makes the antibacterial component less likely to detach from the fiber even after repeated washing.

Testing conducted after 30 washing cycles in accordance with JIS L 1902:2015 confirmed an antibacterial activity value of 2.0 or higher, allowing long-term antibacterial and deodorizing performance to be expected.

■ Analysis and Evaluation Capabilities Supporting Dispersion and Formulation Design Technologies

When inorganic functional fillers are incorporated into ultrafine fibers, it is important to quantitatively evaluate the state of dispersion within the resin. Moving to mass production without a clear understanding of the dispersion condition may result in overlooked risks such as fiber breakage during spinning, filter clogging, or appearance defects.

From the prototype stage, the company examines the dispersion condition and degree of particle agglomeration in both pellets and molded products. Formulations are designed with fiber moldability taken into consideration.

When prototype samples are delivered, the company performs a Resin Pressure Test to present dispersion quality as objective numerical data. These data can be used during customer-side spinning tests and evaluations using actual production equipment. They also help reduce the risk of equipment-related problems such as die or screen clogging, allowing molding evaluations to proceed more smoothly.

■ Joint Development Process and Initial Prototype Consultation

Developing new antibacterial and deodorizing fibers requires the selection of inorganic functional fillers and dispersing agents suitable for PET resin. This evaluation process may require considerable time and cost.

RESINO COLOR INDUSTRY CO., LTD. offers an integrated development process based on the customer’s development objectives and target properties. The process covers the selection of inorganic functional fillers and dispersing agents, laboratory-scale prototyping, and production-scale trial manufacturing.

When a customer’s research equipment cannot sufficiently disperse functional powders or when reagglomeration occurs, the company proposes solutions by considering both formulation design and processing conditions.

For the initial consultation, customers may provide information regarding the resin they plan to use, the method for evaluating the target antibacterial performance, and the required fiber diameter. The company’s technical department will then assess the feasibility of development.

In Japan, consultations are available through the Osaka Head Office and Tokyo Branch. In Thailand and other parts of Southeast Asia, customers may contact the company through its group network, including Sakai Trading Thailand.

■ Frequently Asked Questions (FAQ)

Q1. When adding antibacterial zinc oxide to fibers, can the material be supplied in a form other than pellets?
A1. Yes. The company can supply the material as a liquid dispersion according to customer requirements. The product form and delivery method will be designed to suit the customer’s processing procedures and equipment.

Q2. How does the company handle product delivery and logistics procedures in Thailand and Southeast Asia?
A2. The company uses the logistics network of Sakai Trading Thailand, a group company, to support deliveries to factories in Thailand and other Southeast Asian countries. The group network also provides support for import and export procedures and local commercial transactions.

Q3. Does the company have equipment for testing and evaluation?
A3. Yes. The company has various testing and evaluation instruments, including Compounding and Extrusion Test Equipment, a Digital Microscope, a Scanning Electron Microscope, a Melt Flow Tester, and TG-DTA equipment. Samples can also be supplied with analytical data when required.

※For more details, please download the attached materials or contact us via the form below.