YUNZHU logo

Troubleshooting & Solutions

This category focuses on real production problems such as sticking, residue, bubbles, surface defects, and unstable demolding, with clear causes and corrective actions.

Analysis of the Relationship Between Pitting, Dust Adhesion, and Concrete Release Agents

Analysis of the Relationship Between Pitting, Dust Adhesion, and Concrete Release Agents

Learn how release-agent film-forming materials, solids content, and pH can contribute to pitting and dust adhesion in precast concrete—and how to reduce surface defects.

Concrete Air Voids: 6 Major Causes and Effective Solutions

Concrete Air Voids: 6 Major Causes and Effective Solutions

Still troubled by concrete air voids, pinholes, blowholes and surface defects?Solving Concrete Air Pockets Problems for Precast Concrete Manufacturers

Waste Oil + Diesel vs Water-Based Concrete Release Agent: Cost, Performance and Application Comparison

Waste Oil + Diesel vs Water-Based Concrete Release Agent: Cost, Performance and Application Comparison

In Southeast Asia, the Middle East, and parts of Africa, the use of waste oil mixed with diesel as a concrete release agent is still quite common. Let’s take a look at the differences between waste oil + diesel and water-based concrete release agents.

Mold Fouling in PU Production: Causes and Fixes

Mold Fouling in PU Production: Causes and Fixes

In continuous polyurethane (PU) foam production, mold cleanliness is a critical factor that directly impacts product appearance, production efficiency, and overall manufacturing cost. Whether in shoe soles, automotive interior integral skin parts, seating cushions, or industrial components, manufacturers inevitably face a common challenge at scale — **mold fouling**. Once deposits accumulate on the mold surface, they lead to difficult demolding, increased defect rates, and more frequent downtime for cleaning. Over time, this disrupts production flow and affects delivery reliability. This article provides a systematic analysis of the root causes of mold fouling in PU production and offers practical, industry-proven solutions to help manufacturers achieve **stable demolding, lower defect rates, and extended mold life**.

Top 10 Injection Molding Manufacturers in the USA for 2025

Top 10 Injection Molding Manufacturers in the USA for 2025

The injection molding industry plays a vital role in modern manufacturing, enabling rapid mass production of high-quality plastic components. As demand rises across automotive, medical, consumer goods, and aerospace sectors, choosing the right molding partner is crucial. Top US manufacturers stand out through advanced technologies like multi-cavity molds and hot runner systems, ISO-certified quality assurance, and deep industry expertise. Here is the ranked overview of the top 10 injection molding manufacturers in the US for 2025.

Demolding Solutions for Complex Concrete Molds(PART 2)

Demolding Solutions for Complex Concrete Molds(PART 2)

In our previous blog post, we introduced the concept of special-shaped concrete molds and the challenges associated with their demolding. Today, we’re diving deeper into this topic to share our recommendations on how to tackle these demolding difficulties!

Demolding Solutions for Complex Concrete Molds(PART 1)

Demolding Solutions for Complex Concrete Molds(PART 1)

As modern architectural designs become increasingly diverse, complex-shaped (irregular) concrete components are being widely adopted in bridges, curtain walls, and prefabricated buildings. However, due to their intricate geometric boundaries, deep recesses, and non-continuous surface curvatures, the demolding process for these components faces significantly higher mechanical resistance compared to standard molds. Failure in demolding does not only manifest as surface defects like honeycombing, pitting, or edge chipping; it can also cause structural micro-cracks due to localized stress concentration or even lead to permanent mold deformation. Based on our industry expertise, this article analyzes the root causes of these demolding difficulties and provides practical solutions to ensure stable stripping and high-quality finishes.

Surface Air Bubbles in Precast Concrete: Causes and Solutions

Surface Air Bubbles in Precast Concrete: Causes and Solutions

A deep analysis of the mechanisms behind air bubble formation in precast concrete elements, with multiple strategies to prevent bubble occurrence. The focus is on the fact that selecting the right concrete release agent can effectively prevent air bubbles in concrete.

Whatsapp