Six white papers from HEXPOL provide valuable technical information about HCR Silicone Injection Molding, Continuous Process Improvement (CPI), Understanding Performance Additives, Compound Designs for Automated Elastomer Molding, Peroxide Cureable Silicone Injection Molding, and From Silicon to Silicone. Descriptions of these white papers and access to corresponding PDFs are included below.
Library of Technical Information
Maximizing the benefits of High Consistency Rubber (HCR) silicone for injection molding and leveraging its versatility requires special considerations to manufacture quality parts.
Due to its inorganic polymer backbone, HCR silicone processing poses unique challenges when compared to organic polymer-based rubber compounds, but provides excellent bene ts. This white paper addresses those challenges and how to meet them. Press selection, mold design, and gate design considerations are, in most cases, similar for both HCR silicone and organic rubber. However, processing issues are, in some aspects, significantly different. Therefore, issues such as part shrink- age, air entrapment and hot tear when using HCR silicone are reviewed in detail. Substrate bonding strategies and trouble-shooting steps unique to HCR silicone are addressed as well.
The concept of continuous improvement has been around for decades. Countless enterprises – manufacturing, healthcare, education and financial services, to name a few – implement some or all of its components. This white paper addresses HEXPOL Compounding's Continuous Process Improvement (CPI) methods, and how they help improve an organization's processes, products, and services.
The HEXPOL CPI program is used by our Field Technical Services Group to collaborate with customers and analyze their processes. HEXPOL's CPI model includes these eight components:
- Application Definition
- Knowledge & Resources
- Formulation & Testing
- Trial Batch
- Technical Visit Reports
- Chemistry Modi cation
- Set Process Limits
- Continuous Tech Support
This white paper addresses when and how to use performance additives. When properly selected, performance additives bring value and clear benefits to the application. They address manufacturing and process concerns to help maintain quality and consistency during compounding.
The number of available additive options can be overwhelming to compounders and plant chemists. Therefore, a systematic approach to performance additive selection should be used to define objectives clearly, such as: better throughput, precise control of critical ingredients, lower costs with shortened mixing cycles, timely and complete dispersion, worker safety, and color control, to name a few.
Reasons for using performance additives, proper selection of additives to meet application objectives, different performance additive types, and manufacturing and cost benefits are addressed in this white paper.
Elastomer compound design for injection molding is a complex balance of end-use properties, product specifications, chemistry, and processing characteristics. Careful consideration must be given to all variables. This white paper addresses many of those variables, such as the line callout – which includes service requirements for fluid compatibility, temperature, cost considerations, and the physical form of the compound. Other topics covered and their effect on successful compound design for injection molding includes:
- Polymer Type Selection
- Compound Cure System
- Compound Viscosity
- Cost Parameters
- Hot Tear Issues
- Mold Release
- Mold Fouling
- Cycle Time
The compounder, whether in-house or a custom compounder, should be consulted as early as possible during the process design. A joint effort, including the developer of the tooling, process engineers, and compound chemists is ideal.
High Consistency Rubber (HCR) silicone injection requires special consideration to manufacture quality parts. The selection of the press, mold design, and gate design are integral to success. HCR silicone processing pose unique challenges when compared with organic based rubber compounds. Part shrinkage, air entrapment, and hot tear issues are examples of processing issues to be considered. Bonding strategies and techniques for metal and plastic substrates are addressed in detail.
Click here to view a copy of the Peroxide Cureable Silicone Injection Molding white paper.
Silicone is a very versatile polymer used for amazing applications. This white paper provides an overview of silicone rubber and focuses on High Consistency Rubber silicone (HCR) and Liquid Silicone Rubber (LSR). It also examines characteristics of both silicone types, defines their respective properties, addresses process and production considerations, and lists recommended applications.
Click here to view a copy of the Silicon to Silicone white paper.