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White papers

White papers

Title: Understanding and Optimizing Weld Lines in Thermoplastic Molding

Description: Weld lines (also called knit lines) are surface defects that form during mold filling when flow fronts come together at sufficiently small interface angles. This typically happens where flow fronts rejoin after holes or where flow fronts merge from two or more gates. In addition being unsightly, weld lines can also be weaker than the surrounding area.

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Gate design for a high-quality surface finish

Title: Gate design for a high-quality surface finish

Description: Mold design

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Laser transmission welding of Covestro thermoplastics

Title: Laser transmission welding of Covestro thermoplastics

Description: Welding

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Self-Tapping screws for thermoplastics

Title: Self-Tapping screws for thermoplastics

Description: Mechanical Fasteners

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The insertion of connecting elements using ultrasound

Title: The insertion of connecting elements using ultrasound

Description: Mechanical Fasteners

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Laser marking of Covestro thermoplastics

Title: Laser marking of Covestro thermoplastics

Description: Laser Marking

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Purging compounds for use when molding thermoplastics

Title: Purging compounds for use when molding thermoplastics

Description: Cleaning of Plastizising Unit

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Injection Molding of High-Quality Molded Parts-Drying

Title: Injection Molding of High-Quality Molded Parts-Drying

Description: Drying

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Determining the Dryness of Makrolon by the TVI Test

Title: Determining the Dryness of Makrolon by the TVI Test

Description: Drying

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Optimized Mold Temperature Control

Title: Optimized Mold Temperature Control

Description: Processing Data

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Process Variables as Production Cost Factors in the Inject Molding of Thermoplastics

Title: Process Variables as Production Cost Factors in the Injection moulding of
Thermoplastics: Melt, Mold and Demolding Temperature, Cycle Time, p-v-J Diagrams

Description: Process Optimization

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Calculating the mold-filling process for thin-walled injection moldings

Title: Calculating the mold-filling process for thin-walled injection moldings

Description: Thin Wall Molding

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Shrinkage and deformation of glass fiber reinforced thermoplastics may be calculated

Title: Shrinkage and deformation of glass fiber reinforced thermoplastics
may be calculated

Description: Fundamentals

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Enhancing Impact Resistance and Toughness

Title: Enhancing Impact Resistance and Toughness in Molded Medical Parts

Description: Medical Parts

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Title: Understanding Flow Hesitation in Molded Medical Parts

Description: Molded parts can be difficult to fill for a variety of reasons. Some, such as when the walls are too thin or the flow length too long, are obvious. Non-fill due to inadequate venting or poor processing is less obvious but still readily understandable.

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Photoelastic Stress Analysis of Polycarbonate Medical Parts

Title: Photoelastic Stress Analysis of Polycarbonate Medical Parts

Description: Medical Parts

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Overmolding with Polycarbonate and Polycarbonate Blends

Title: Overmolding with Polycarbonate and Polycarbonate Blends

Description: Overmolding

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Addressing Molded-In Stresses and Part Durability

Title: Addressing Molded-In Stresses and Part Durability

Description: Part property

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Balanced Filling in Thermoplastic Medical Molding

Title: Balanced Filling in Thermoplastic Medical Molding

Description: Processing

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Design with Makrolon® Thermally Conductive Polymers

Title: Design with Makrolon® Thermally Conductive Polymers

Description: In-mold electronics integration

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Marking products made of technical thermoplastics

Title: Marking products made of technical thermoplastics

Description: Marking of products

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Materials and packaging solutions for energy storage systems used in electromobility

Title: Materials and packaging solutions for energy storage systems
used in electromobility

Description: Materials and packaging solutions

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Environmental stress cracking - bend strip test

Title: Environmental stress cracking - bend strip test

Description: Stress cracking

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Makrolon® The chemical resistance

Title: Makrolon® The chemical resistance

Description: chemical resistance

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Makrolon® - Stress crack test - Makrolon® moldings

Title: Makrolon® - Stress crack test - Makrolon® moldings

Description: Makrolon® moldings

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Title: Accommodating Molding Shrinkage in Polycarbonate Materials

Description: This article addresses the factors that influence molding shrinkage and then provides tips to better predict shrinkage.

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Title: Balanced Filling in Thermoplastic Medical Molding

Description: If molten plastic behaved like a simple fluid, there would be little need to worry about balanced filling during molding. In reality, molten plastics are complex, viscous, and highly compressible fluids.

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Title: Enhancing Impact Resistance and Toughness in Molded Medical Parts

Description: Impact resistance and toughness are obvious requirements for applications such as sports equipment, protective eyewear, and portable electronics such as cell phones and game controllers. Increasing numbers of medical devices require similar performance.

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Title: Gate Design for Polycarbonate Medical Parts

Description: Most part designers consider gate design to fall solely under the responsibility of the mold shop, and are therefore uninterested in gate design. This is short sighted. Poor gate design can reduce part performance and create cosmetics defects.

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Title: Is DirectCoating or DirectSkinning Right for Your Device?

Description: Following injection-molding, it is fairly common for components for plastic housings to be subjected to secondary operations such as painting, coating, or being bonded to a foam. Recently, DirectCoating and DirectSkining (DC/DS) has proven to be effective at producing premium quality surfaces or reducing manufacturing steps thanks to combining multi-operations into an efficient single step within the mold.

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Title: Photoelastic Stress Analysis of Polycarbonate Medical Parts

Description: For nearly 50, years, Makrolon® polycarbonate has been chosen for medical applications because of its excellent combination of properties including transparency, outstanding toughness, dimensional stability, moldability, low shrink rate, sterilizability, and compatibility with many adhesives and welding techniques.

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Title: Stress Relaxation: How long will the connection stay tight?

Description: A plastic supporting a fixed load can stretch and deform, a condition known as creep. Alternatively, a plastic under a fixed deformation will see resistance to that deformation diminish over time. This is due to stress relaxation, which is the topic of this article.

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Title: Validating the Molding Process – Material Variability

Description: The validation of a molding process attempts to methodically address the primary installation, operational and processing factors affecting part quality and consistency. The goal is to establish a process that consistently produces parts in the middle of the dimensional tolerance range, thereby minimizing rejects and other quality issues.

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Radiation Sterilization of Custom Colored Medical Resins

Title: Radiation Sterilization of Custom Colored Medical Resins

Description: To help designers achieve personalized (visual) aesthetics while retaining functionality of their medical devices, Makrolon® polycarbonate medical-grade resins are available in a wide variety of clear tints or opaque colors.

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