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Defects caused by foreign objects occurring in the liquid bath cleaning process of communication equipment parts directly impact downstream yields and complaints. We offer an upgrade to high-performance filters with high collection accuracy and long lifespan, combined with local prototyping and evaluation at our Vietnam base. This approach has successfully raised quality levels in a short period and reduced re-cleaning costs in downstream processes.
Deterioration of Yield Caused by Foreign Objects Occurring in Liquid Bath Cleaning Lines
Foreign objects remain in the liquid bath cleaning process of communication equipment parts, causing defects to manifest in downstream processes. There is a desire to raise the quality level.
The collection accuracy and durability of the current filter fail to meet requirements. An upgrade is an urgent matter.
●Scenarios where manifested: Improvement of existing lines. Emerged as a requirement during a quality meeting at the Vietnam factory.
●Main impacts: Deterioration of yield, increased re-cleaning costs in downstream processes, and complaints from customers.
Why Do Foreign Objects Remain? Limits of Filter Physical Properties and Cleaning Liquid Contamination
Physical property limits of the existing filter (collection accuracy and lifespan). Foreign objects re-adhere due to the progression of cleaning liquid contamination.
Basis of identification: Interviewing about the quality level on-site / Comparison between defective samples and filter-collected samples.
Countermeasures Tried So Far and Their Limits
Increasing the filter replacement frequency (limited effect despite increased costs), and adjusting the cleaning liquid concentration (concern over parts damage).
Based on these limitations, we adopted the following approach as a more fundamental countermeasure.
Solution Approach: Upgrading to High-Performance Filters × Local Prototyping and Evaluation
Implemented grade changes of existing materials (replacement with high-performance filters) + on-site prototyping and evaluation.
STEP. 01
Alternative Product Search
Comparing high-performance filters from multiple manufacturers using technical data
STEP. 02
Local Evaluation
Rapidly iterating prototyping and on-site evaluation at our Vietnam base
STEP. 03
Sharing Technical Expertise
The Japanese technical team and local staff collaborate to organize evaluation data
Fuji Chemi Trading’s Support System: Vietnam Base × Headquarters Technology × Partner Manufacturers
This solution is realized through the division of roles across multiple bases.
・Vietnam Base: Customer window, on-site evaluation, and prototype delivery
・Headquarters / Technology: Filter grade comparison and evaluation reports
・Partner Manufacturers: Stable supply of high-performance products and provision of physical property data
●Supply System: Local delivery support, small samples for evaluation can be shipped immediately.
Results of Implementation
Improved collection accuracy reduced defects caused by foreign objects. Yield in downstream processes stabilized.
●KPI Candidates: Defect rate reduction / Optimization of filter replacement costs / Reduction of re-cleaning in downstream processes.
●Implementation Lead Time: After prototyping and evaluation, rolled out to mass production locally in a short period.
Expected Ripple Effects and Horizontal Rollout
The effects of implementing this solution extend beyond solving the primary issue. Please also utilize it as material for internal and management-level proposals.
・Horizontal rollout to other cleaning lines (precision parts, semiconductor peripherals, substrates)
・Collaborative sales with filter housing and filtration equipment manufacturers
・High reproducibility under the theme of “complaints caused by foreign objects,” making it easy to replicate across operations
・Creating a reference case for other factories in Vietnam and other companies
Difference from Competitors: Why Fuji Chemi Trading is Chosen
Overseas filter trading companies focus mainly on single product sales. Fuji Chemi is capable of offering proposals that combine “local evaluation + Japanese quality + communication equipment expertise.”
Product Information and Spec Summary
The main specifications of products with a proven track record of adoption can be selected from multiple grades depending on the application and requirements. Typical specifications are as follows (please contact us for detailed specifications).
| Item | Specifications |
|---|---|
| Main Application | Foreign object removal in liquid bath cleaning lines (for communication equipment parts) |
| Filter Type | Multiple grades depending on application (centered on high-performance products) |
| Collection Accuracy | Selected according to application requirements (micron to submicron) |
| Supported Processes | Pre-cleaning / Main cleaning / Final cleaning |
| Local Evaluation | Rapidly iterating prototyping and on-site evaluation at our Vietnam base |
| Delivery Form | Local delivery support, small samples for evaluation can be shipped immediately |
How to Utilize and Operational Examples
For actual operations, the following patterns are widely adopted.
・Evaluation Phase: Requirement hearing → Sample evaluation → Specification finalization
・Pre-mass Production Preparation: Cross-base division of roles, specification standardization, and local launch
・Mass Production Phase: Ensuring short lead times and stable supply through our supply system
・Horizontal Rollout: Supporting horizontal rollout to other bases and other projects
FAQ (Frequently Asked Questions)
How do we proceed with filter selection?
We will interview you regarding the current situation of foreign object generation, the type of cleaning liquid, and flow rate conditions, compare the specifications of candidate filters, and then proceed to prototype evaluation.
Can you also support overseas factories outside of Vietnam?
Yes, similar prototype evaluation support is also available at our Thailand and China bases.
Is it possible to request samples for evaluation?
Yes, it is possible. Please let us know your required physical properties, flow rate, and expected foreign object size.
Can we also request collaboration with the filtration equipment manufacturer?
Yes, we can also propose collaborative sales efforts with filter housing manufacturers and filtration equipment manufacturers.
Can you also offer proposals for other cleaning processes (semiconductors, precision parts)?
It is also applicable to measures against foreign objects in the fields of precision parts, semiconductor peripherals, and substrates.
Proposals by Related Applications and Issues
■Stable Supply and High Quality of Fluoropolymer Film (FEP/PFA) | Providing Multiple Samples with Short Lead Times through In-House Slitting
■Joint Development of Low-Contamination Release Separator (Zero Adhesive Residue) | Achieving Both Function and Quality through Optimal Blending of Adhesive × Hardener
■Local Procurement of Static Electricity Measures for OA Equipment in Vietnam | Selecting Static Elimination Brushes and Conductive Fibers Aligned with the Manufacturer’s Design Philosophy
