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Metal parts painting Product List

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What causes small holes in the coating? Key points of pinhole defects.

What causes small holes in the coating? Key points of pinhole defects.

Understanding the mechanism of occurrence can prevent recurrence.

Are you troubled by pinholes that create small holes in the painted surface? Even if they appear minor, they can often lead to quality issues. Many of the causes are due to solvents in the paint evaporating rapidly or gases emanating from the substrate. Particularly, thick applications and deviations in drying conditions can easily trap air bubbles inside. Additionally, the frequency of occurrence can vary significantly depending on the type of material and the state of pretreatment. As a countermeasure, managing film thickness and optimizing the drying process are crucial. So, why do pinholes occur sometimes even under the same conditions? Paint defects cannot be improved with a vague approach. Accurately identifying the cause is the first step in preventing recurrence. Our company has published materials summarizing case studies on improving paint defects, including pinholes. Please take a moment to review them to avoid repeating the same issues.

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The pitfalls of baking drying! The trap of uncured material caused by "only the surface drying."

The pitfalls of baking drying! The trap of uncured material caused by "only the surface drying."

Even though it is baked at the specified temperature, is the hardness insufficient? The truth about the invisible temperature unevenness occurring inside the drying oven.

[Cause of Occurrence] There is a problem in the curing process after painting where "despite drying at the specified temperature and time, the hardness of the paint film is low, or there is a lingering solvent smell." This issue occurs frequently, especially with thick automotive parts. [Truth] Even if the displayed temperature in the drying oven is 180 degrees, the actual "product temperature" of the metal parts may not reach that level, which is the main cause. Thick parts have a large heat capacity, causing only the surface to dry rapidly while the internal solvent does not fully escape, leading to an uncured state that can induce pinholes. [Improvement Measures] It is essential to regularly use data loggers to attach thermocouples directly to the products and measure the actual "product temperature profile." A guide for setting optimal curing conditions, taking into account the heating time, is available for download as free technical documentation. [Summary] By managing based on "product temperature" rather than the oven temperature during the drying process, stable paint film hardness can be achieved. Eiwa Kogei Co., Ltd. assesses the heat capacity of each product and provides high-quality metal coatings under optimal curing conditions.

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What causes the corners to rust first? The pitfalls of edge film thickness.

What causes the corners to rust first? The pitfalls of edge film thickness.

The flat surface has no issues, but the corners are rusting. The film thickness at the edges drops to less than half of that on the flat surface. We will improve this by requesting a chamfer and adding measurement points.

The surface is clean, but only the edges and the rims of the holes rust first. It's not due to the corrosion resistance of the paint; it's that the film thickness is insufficient in those areas. The film thickness at the edges drops to 30-50 percent of that on the flat surfaces. ────────────── ■Cause of Occurrence The paint escapes from the corners due to surface tension and is pulled toward the flat surfaces. In powder coating, static electricity concentrates at the corners, leading to unstable adhesion. ■Truth The oversight is due to measuring the film thickness only on the flat surfaces. Even if it meets the standards, the corners fall below the corrosion resistance limit. ■Improvement Measures Request a chamfer of R0.5 or more during the design phase to reduce sharp edges. Paint the corners first, then coat the entire surface, and add corners as measurement points for film thickness. Please utilize the document summarizing the film thickness management standards by area.

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What causes paint to turn white? Humidity management to prevent whitening.

What causes paint to turn white? Humidity management to prevent whitening.

White discoloration that occurs frequently during the rainy season and summer. It is a phenomenon where the paint surface cools and condenses due to the evaporation of the solvent. It can be prevented by selecting the right thinner and managing humidity.

Only black and clear finish strangely turns out cloudy white. Before suspecting the paint lot, please check the humidity for that day. When humidity exceeds 70 percent, the risk of whitening rises sharply. ────────────── ■Cause of Occurrence When the solvent evaporates, the temperature of the paint surface drops, causing moisture in the air to condense. The tiny water droplets that are taken in scatter light and make the surface appear cloudy white. ■Truth Fast-drying thinners cause a greater drop in temperature during evaporation, leading to whitening. Managing humidity and the temperature of the material is more effective than managing temperature alone. ■Improvement Measures On days with high humidity, use 5-10 percent slow-drying thinner or retarders in combination. Keep the humidity in the painting booth below 60 percent and acclimate the materials to room temperature. Please utilize the materials summarizing the thinner selection criteria by season.

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Fujimura Coating Industry Co., Ltd. Introduction to Metal Parts Coating

Fujimura Coating Industry Co., Ltd. Introduction to Metal Parts Coating

Leave the reduction of defect rates to us!

Fujimura Coating Industry Co., Ltd. specializes in the painting of metal parts. We have a track record with over 50 automotive-related manufacturers and implement comprehensive strategies to reduce defect rates consistently, including before and after painting. We quickly resolve painting issues such as staining, dripping, and scratches by using painting methods suited to the products. 【Painting Methods】 ■ Cationic Electrodeposition Coating ■ Electrostatic Spray Coating ■ Cationic Electrodeposition Coating + Electrostatic Spray Coating ■ Chemical Treatment *For more details, please refer to our catalog or feel free to contact us.

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High-quality coating of metal parts

High-quality coating of metal parts

Rust prevention, solvent coating, powder coating, balancing durability and aesthetics! Capable of painting complex shapes as well.

Our company provides "high-quality painting of iron parts" with customizable film thickness and gloss specifications to meet your requirements. We accommodate a wide variety of painting methods, including rust prevention painting, topcoat painting (air-drying), baking paint, and powder coating. Additionally, for signal arms (iron pipes), we also perform surface treatments such as hot-dip galvanizing in collaboration with JIS-certified factories. 【Features】 ■ Customization available to meet customer requirements, such as film thickness and gloss specifications ■ High-quality painting services provided ■ Balances durability and aesthetics ■ Available sizes: Width 1m × Height 2.4m × Length 12m, Weight 5t *For more details, please download the PDF or feel free to contact us.

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Emergency reapplication! Within 3 days, handling 5,000 pieces.

Emergency reapplication! Within 3 days, handling 5,000 pieces.

Emergency response! Saved! 5,000 repaints completed within 3 days.

"The finish is different" "I need it repainted urgently" — In such emergencies, Eiwa Kogei responds immediately with its own stripping equipment (chemicals, heating, blasting). We accept repainting requests that other companies have declined, within 3 days and for up to 5,000 pieces. With a consistent process from zinc phosphate treatment to painting, inspection, and packaging, we ensure quick arrangements. Trust us especially during troubles. 【Cases for repainting we can handle】 - The finish color is different from the specifications - Defects such as uneven paint, drips, or spots - Color changes or rework due to specification changes - Urgent repainting requests declined by other companies

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A comprehensive explanation of the causes and countermeasures for sauce leakage.

A comprehensive explanation of the causes and countermeasures for sauce leakage.

Completely prevent painting defects and drips by managing viscosity, distance, and angle.

The main causes of painting defects known as "drips" are excessive paint application, improper viscosity, and variations in gun distance. Eiwa Kogei manages paint viscosity within the appropriate range and standardizes discharge volume, spray distance, and angle to prevent excessive paint adhesion. By visualizing conditions that eliminate variations among operators, we achieve stable quality. If you are experiencing painting defects, please feel free to consult us. **Main Causes of Drips:** - Paint viscosity is too high or too low - Discharge volume from the spray gun is too high - The distance between the gun and the product is too close - Variations in painting angle - Applying too much paint at once **Eiwa Kogei's Measures and Initiatives:** - Regular measurement and proper management of paint viscosity - Standardization of discharge volume, gun distance, and angle - Visualization of working conditions and improvement of procedural documentation - Reduction of variations among operators

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What causes paint to chip easily? Basics of chipping prevention.

What causes paint to chip easily? Basics of chipping prevention.

Adhesion and coating design determine durability.

Are you struggling with chipping of the coating due to impact? This is an important defect that directly relates to durability. The causes are insufficient adhesion and lack of coating strength. Proper substrate preparation and paint selection have a significant impact. As a countermeasure, it is crucial to design the coating according to its intended use. Coating defects cannot be improved with a vague approach. Accurately identifying the cause is the first step in preventing recurrence. We have published materials summarizing examples of chipping countermeasures. Please check them to avoid repeating the same troubles.

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Countermeasures for Sauce Defect Complaints

Countermeasures for Sauce Defect Complaints

Appearance defects caused by paint dripping occur due to excessive film thickness or irregularities in viscosity management.

The defect is an appearance issue where the paint flows on the coated surface, creating streaks. At the customer’s site, not only the appearance but also the dimensions and assembly can be problematic. The causes include excessive spraying, reduced viscosity, gun distance, posture before drying, and paint pooling due to the shape of the parts. Preventing recurrence can be achieved not only by the skill of the operator but also by standardizing the film thickness criteria, discharge amount, jig posture, and holding time.

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What causes a decline in quality with short delivery times? Processes that cannot be eliminated.

What causes a decline in quality with short delivery times? Processes that cannot be eliminated.

In urgent cases, the number of defects increases. We will differentiate between the parts of the painting process that can be shortened and those that cannot.

When I ask to hurry, the quality always drops. What is being cut down is not the work itself, but the waiting time. ────────────── ■Cause of Occurrence Most of the time in the painting process is spent waiting for drying and cooling. Even if we increase the number of people, this time cannot be physically shortened. ■Truth If we cut down on drying after degreasing, moisture remains, leading to poor adhesion. If we compress the time spent in the curing oven, it results in insufficient hardening and stickiness. The only time that can truly be shortened is the waiting time for setup and transportation. ■Improvement Measures When placing an order, confirm the breakdown of the delivery date to ensure that no processes are being cut. By grouping colors together and reducing the number of color changes, we can shorten the time while maintaining quality. Eiwa Kogei has a track record of responding within three days while ensuring process time.

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Lightweighting through powder coating for bicycles

Lightweighting through powder coating for bicycles

Achieving weight reduction of bicycle parts with metal coating!

In the bicycle industry, weight reduction is an important challenge for improving riding performance. Particularly in competition-oriented bicycles such as road bikes and cross bikes, the weight of components significantly affects performance. The weight of metal parts can also be influenced by the painting method. Powder coating has the potential to achieve weight reduction while maintaining the strength of the coating. Eiwa Kogei Co., Ltd.'s powder coating contributes to the lightweighting of bicycle components. 【Application Scenes】 - Frame - Fork - Handlebar - Seat post 【Effects of Implementation】 - Improved riding performance through weight reduction - Enhanced design quality - Increased durability

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Insufficient cleaning is the cause of all painting defects and the truth behind recontamination.

Insufficient cleaning is the cause of all painting defects and the truth behind recontamination.

Post-cleaning environmental management is important.

【Problem】Residual oil and contaminants left on the surface due to insufficient cleaning cause poor adhesion. 【Cause】Recontamination occurs due to leaving the surface after degreasing / Dust and oil from the environment adhere / Insufficient cleaning does not provide a fundamental solution / If drying is inadequate, moisture remains. 【Management Standards】It is recommended to paint immediately after cleaning and minimize the waiting time. 【Improvement Example】By strictly managing the cleaning process, defects caused by recontamination have been reduced.

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What causes the difference in color between iron and aluminum? How to match the material differences.

What causes the difference in color between iron and aluminum? How to match the material differences.

Even though I painted with the same color number, the appearance differs depending on the material. I will explain how to match the colors of the combined parts.

Even though I painted with the same color number, the color looks different on iron and aluminum. The paint is the same; the difference lies in the substrate. ────────────── ■Cause of Occurrence The pre-treatment and the color of the substrate differ for each material. When the reflection of the substrate changes, the appearance changes even if the topcoat is the same. ■Truth Aluminum has a thin conversion coating, making the substrate appear brighter. Iron has a zinc phosphate coating that gives it a grayish tint, making the same paint look darker. Lighter colors and semi-gloss finishes tend to show more difference, which is noticed after assembly. ■Improvement Measures For parts made of mixed materials, unify the color of the primer to eliminate differences. Manage the film thickness for each material to ensure the hiding power of the topcoat. Eiwa Kogei can paint mixed parts of iron and aluminum under the same conditions.

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