CHECKLIST Sending Request For Quote
SELECTION AND DESIGN GUIDELINES
DESIGNING FOR SUCCESSFUL OVERMOLDED COMPONENTS
jobst incorporated CHECKLIST Here is a handy checklist of things to include in a request for quotation. Sent your project information to us.
Quantities:
Quantities: prototyping, pre-production, and production.
How often ordered: monthly, quarterly, or annually
Unit of measure: pieces or feet, etc
example: Production quantities of: 300, 500, and 1,000 pieces. Annual Usage 3,000 pieces.
General information:
Application, Environment, Engineering Design Facts, Test and Specifications, Material, Appearance, Economic Factors, Misc.
Contact Information:
Name, Company Name, Title, Address, Telephone and Fax Number, E-mail address
Prints or Samples
Contact Us: sales@jobstinc.com
Application: How will the part be used and what is its function
Performance Requirements: Structural, Aesthetic, etc.
Combining Multiple Parts or Functions
Structural Load: Static, Dynamic, Cycling, Impact. etc.
Environment: Temperature, Time. Chemical, etc.
Tolerance Requirements
Life of Product
Quantity of Product vs. Fabrication Process
Secondary Operation
Packaging and Shipping
Temperature
Time
Load
Other Environments: Chemical, Water, Humidity, etc
Type of Load
Frequency of Load
Stress Rate: Compression, Tensile, Flexural
Strain Amplitude
Load Deformation: Tensile, Compression, Shear, etc
Apparent Modulus: includes Strain Due to Creep
Direction of Load
Correlating Test Data With End Use
Safety Factor
Tests and Specifications: ATIM, SAE, UIL, Etc.
Tension
Compression
Creep
Dynamic/Fatigue/Torsion
Impact
Poisson's Ratio
Electrical
Continuous Service Temperature/U.L. Temperature Index
Material and Process back to top
Directional Flow
Directional Layout of Reinforcements
Regrinding
Pre-drying
Prototyping: Machining, Molding
Style
Shape
Color
Surface Finish/Weld Lines/Flow Lines/Parting Line/Gate Location
Decoration
Economic Factors back to top
Cost of Present Part
Cost Estimate of Part
Faster Assembly and Elimination of Finishing Operation
Redesign Part to Simplify Product
All Contents Copyright © 2007-2008 jobst incorporated
P.O. Box 8 Prior Lake, MN 55372
Phone: 952.447.3904 Fax: 952.447.3709.6121
SELECTION AND DESIGN GUIDELINES DSM Engineering Plastic Products, Inc 1999
Plastics are increasingly being used to replace other materials like bronze, stainless steel, aluminum and ceramics. The most popular reasons for switching to plastics include:
Longer part life Elimination of lubrication Reduced wear on mating parts Faster operation of equipment/line speeds Less power needed to run equipment Corrosion resistance and inertness
With the many plastic materials available today, selecting the best one can be an intimidating propositition. Here are guidelines to assist those less familiar with these plastics.
| Determine whether the component is a:
1-Bearing and Wear Application (i.e., frictional forces) OR Structural (static or dynamic) Application 2-Consider the thermal requirements of your application using both typical and extreme conditions. 3-Consider chemicals to which the material will be exposed during use and cleaning. 4-Consider additional material characteristics including: Relative Impact Resistance/ Toughness Dimensional Stability Regulatory/Agency Compliance 5-Select the most cost-effective shape for your part. Be sure to investigate all of the shape possibilities—you can reduce your fabrication costs by obtaining the most economical shape. For the whole article: www.dsmepp.com/fabricat/namerica/dguide.html |
Factors To Consider When Designing Overmolded Plastic Parts
1-Material Characteristics, 2-Performance Requirements, 3-Processing Parameters, 4-Costs
A component or product may have to perform several functions. One or two may be primary and the balance secondary. What are the primary requirements of the product or component design? You must distinguish between primary requirements and secondary desires.
Secondary functional enhancements may not be needed ant the customer may not be willing to pay for them. Does the product or component require overmolding two materials or will a simpler single component design address the customers needs? If the decision is for multi-component molded parts because it provides superior tactile performance or aesthetics that proper planning is required for successful overmolding.
Dr. David Raia, Technical Support Engineering& Edwin Tam, VP, Engineered Elastomers Consultant's Corner March 2001 TPE News - Society of plastics Engineers
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Miscellaneous
Factors to consider pressure sensitive adhesives
PSA for extusions:
To begin the PSA selection process, it is important to have the answers for several basic questions:
1.To what type of substrate will the PSA be attached?
2.In what temperature range will the PSA be expected to perform, and with what
chemicals will it come into contact?
3.Will it come into contact with moisture or sunlight?
4.Will the adhesive be functional after installation?
5.Will the adhesive be in shear?
6.What type of radius will the adhesive need to go around?
Also see Vanguard's handling and usage guide, Vanguard's Shielding Questions and Molded Dimension's Urethane Adhesion Guide.
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All Contents Copyright © 2007-2008 jobst incorporated
P.O. Box 8 Prior Lake, MN 55372
Phone: 952.447.3904 Fax: 978.945-6121.6121