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How to solve the dark specks and spots on TPU extrudate or TPU injection products
Jun 25 , 2023
What cause dark specks and spots on TPU extrudate or TPU injection products ① Contamination in the raw material: TPU is sensitive to contamination from impurities present in the raw material. This can lead to dark specks and spots in the extruded or injection-molded product. ② Screw and barrel contamination: If the screw and barrel are not cleaned properly, leftover resin from previous r...
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What is GRS certification
Oct 13 , 2023
GRS (Global Recycled Standard) is a globally recognized certification and labeling system for products made from recycled materials. The purpose of GRS is to promote the use of recycled materials, reduce the environmental impact of production, and provide transparency and assurance to consumers. By using products certified under the Global Recycled Standard, consumers can make more informed choice...
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The proportion of MDI influence the embrittlement performance of TPU at low temperatures
Nov 03 , 2023
MDI is one of the key components used in the production of TPUs. It serves as the isocyanate component, reacting with polyols to form the polyurethane segments of TPU. The selection of MDI type and the ratio of MDI to polyols can affect the physical properties and performance characteristics of the TPU, including its low-temperature behavior. TPU formulated with a higher proportion of MDI generall...
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Why KUNSUN POLYMER MATERIAL company the TPU factory attend China (Wenzhou) Int'l Leather, Shoe Material & Shoe Machinery Fair
Aug 30 , 2024
TPU (Thermoplastic Polyurethane) is a versatile material commonly used in the production of footwear, particularly for shoe soles and components. The China (Wenzhou) International Leather, Shoe Material & Shoe Machinery Fair provides a platform for the footwear industry to showcase their products, technologies, and innovations. KUNSUN POLYMER MATERIAL（FUJIAN）CO., LTD. attend the 27th China (We...
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Compare 3D Printing with traditional injection
Feb 02 , 2026
3D Printing: 3D printing, also known as additive manufacturing, builds objects layer by layer using a digital design. It involves melting or curing to create a three-dimensional object. Traditional Injection Molding: Injection molding is process where molten is injected into a cavity under high pressure. The material then solidifies and takes the shape of the mold. Design Flexibility: 3D Printing:...
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TPU Thick‑Wall Molding: Distinguishing Shrinkage Sink Marks from Short‑Shot Defects
Sep 07 , 2026
Thick-wall TPU injection-molded parts (wall thickness ≥10 mm) often suffer from surface dents or depressions. It is easy to confuse shrinkage‑induced sink marks with short‑shot (incomplete filling) defects. Although they look similar to the naked eye, their root causes, diagnostic logic, and corrective measures are completely different. Misdiagnosis leads to wasted time and incorrect machine adjus...
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Hydrolysis and Aging in TPU vs. TPE A Technical Comparison
Sep 14 , 2026
Thermoplastic Polyurethane (TPU) and Thermoplastic Elastomer (TPE) are both widely used in soft-touch overmolding applications, but their failure modes under environmental exposure—particularly moisture and heat—are fundamentally different. Understanding these differences is critical for material selection in industrial applications where long-term durability matters. This article examines the hyd...
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