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Adhesive Bond Failure Modes

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SabreenGroup

This article discusses adhesive bond failure modes on polypropylene. There are three main failure modes: adhesion failure at the interface between the adhesive and substrate, cohesion failure within the adhesive layer, and mixed mode failure exhibiting characteristics of both. To determine the cause, it is important to identify which failure mode is occurring. Adhesion failures usually originate in manufacturing, while cohesion failures can be from joint design issues or material properties. Once the failure mode is identified, the solution becomes clearer whether to examine manufacturing processes or product design.

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Plastics Decorating ENews HOME | ARTICLES | BLOG | BUYERS GUIDE | SUBSCRIBE | TOPCON | WEBINARS | ADVERTISE | CONTACT LATEST ISSUE Q&A: Adhesive Bond Failure Modes By Scott R. Sabreen Question: Were having bonding problems on polypropylene, even when using corona pretreatment. The problem comes and goes, how can we find a solution? VIEW THE ONLINE EDITION NPE Show Preview NPE Breaking the Mold in Orlando Technology Smart Laser Marking: Faster Speed, Better Quality 2012 Buyers Guide Focus Stepper Motor Technology in Pad Printing Assembly Selecting the Proper Assembly Process Answer:I would first recommend determining the adhesive bond failure mechanism Ask the Expert Expert Tim Berenda answers questions about using screen mode. Essentially, there are three distinctive types: printing for bottle decoration. Adhesion failure interfacially between the adhesive and one of the adherends. Association Cohesion failure by fracture of the adhesive layer leaving traces of adhesion on Letter from the Chairman both surfaces. ANTEC Programming Announced Mixed-mode failure exhibits characteristics of both adhesion & cohesion failure. CALENDAR Adhesion failures occur at the interface between the adhesive and the adherend March 27 (substrate). Visually, there will be residual adhesive remaining at any location on only ABCs of IML: A Basic Course, March 27, Skokie, IL., one surface. Adhesion failures that occur in-the-field almost always originate in the (480) 473-0301, info@rbstechnologies.com manufacturing process; materials, adhesives, surface preparation, contamination, April 1-5 procedures/workmanship, environment, quality control testing and combinations NPE2012, The International Plastics Showcase, thereof. The remaining cause is interfacial degradation, as a function of field service Orlando, FL, www.npe.org life. This latter problem can be prevented during the product design/qualification phase. June 5-6 SPE's Decorating & Assembly Division's Topical Conference, Indianapolis, IN, www.plasticsdecorating.com Cohesion failures result in fracture of the adhesive and are characterized by the visual presence of the adhesive material on the matching faces of both adherends June 19-21 (substrates). Bonds which fail by cohesion exhibit high-strength performance HBA Global Expo, June 19-21, New York City, NY, (achieving optimal dry adhesive bond properties). The adhesive surface may appear www.hbaexpo.com rough and may be lighter in color than the adhesive material, as applied. Failure is usually by shear, but peel stresses or a combination of shear and peel can produce cohesion failure. Cohesion failures that occur in-the-field are typically caused by poor joint design, e.g., insufficient overlap length, or excessive peel forces. Excessive porosity (humidity exposure), and the presence of voids below a critical size can also result in cohesion failure. http://www.plasticsdecorating.com/ENEWS/ENews.asp?item=adhesivebondfailure[4/12/2012 1:48:02 PM]
Plastics Decorating ENews Mixed-mode failures exhibit characteristics of both adhesion failure and cohesion failure because the interface is partially degraded. Essentially, this failure mode is a transitional phase in which the strength of the adhesive bond is lower than the cohesion failure strength. The use of surface pretreatments, either gas-phase glow discharge (such as corona discharge, flame and pressurized cold-gas plasma) or chemical primers, does not Join Our Email List guarantee robust adhesive bond strength results. Once you determine the adhesive Email: Join bond failure mode, the mechanism will guide you toward identifying and solving the critical problem(s). If cohesion failure, examine the product design joint and materials. If adhesion failure, scrutinize your manufacturing process! For Email Marketing you can trust Copyright 2010 Peterson Publications, Inc. Plastics Decorating Magazine 2150 SW Westport Dr., Suite 101 Topeka, KS 66614 (785) 271-5801 Fax (785) 271-6404 http://www.plasticsdecorating.com/ENEWS/ENews.asp?item=adhesivebondfailure[4/12/2012 1:48:02 PM]

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Adhesive Bond Failure Modes

  • 1. Plastics Decorating ENews HOME | ARTICLES | BLOG | BUYERS GUIDE | SUBSCRIBE | TOPCON | WEBINARS | ADVERTISE | CONTACT LATEST ISSUE Q&A: Adhesive Bond Failure Modes By Scott R. Sabreen Question: Were having bonding problems on polypropylene, even when using corona pretreatment. The problem comes and goes, how can we find a solution? VIEW THE ONLINE EDITION NPE Show Preview NPE Breaking the Mold in Orlando Technology Smart Laser Marking: Faster Speed, Better Quality 2012 Buyers Guide Focus Stepper Motor Technology in Pad Printing Assembly Selecting the Proper Assembly Process Answer:I would first recommend determining the adhesive bond failure mechanism Ask the Expert Expert Tim Berenda answers questions about using screen mode. Essentially, there are three distinctive types: printing for bottle decoration. Adhesion failure interfacially between the adhesive and one of the adherends. Association Cohesion failure by fracture of the adhesive layer leaving traces of adhesion on Letter from the Chairman both surfaces. ANTEC Programming Announced Mixed-mode failure exhibits characteristics of both adhesion & cohesion failure. CALENDAR Adhesion failures occur at the interface between the adhesive and the adherend March 27 (substrate). Visually, there will be residual adhesive remaining at any location on only ABCs of IML: A Basic Course, March 27, Skokie, IL., one surface. Adhesion failures that occur in-the-field almost always originate in the (480) 473-0301, info@rbstechnologies.com manufacturing process; materials, adhesives, surface preparation, contamination, April 1-5 procedures/workmanship, environment, quality control testing and combinations NPE2012, The International Plastics Showcase, thereof. The remaining cause is interfacial degradation, as a function of field service Orlando, FL, www.npe.org life. This latter problem can be prevented during the product design/qualification phase. June 5-6 SPE's Decorating & Assembly Division's Topical Conference, Indianapolis, IN, www.plasticsdecorating.com Cohesion failures result in fracture of the adhesive and are characterized by the visual presence of the adhesive material on the matching faces of both adherends June 19-21 (substrates). Bonds which fail by cohesion exhibit high-strength performance HBA Global Expo, June 19-21, New York City, NY, (achieving optimal dry adhesive bond properties). The adhesive surface may appear www.hbaexpo.com rough and may be lighter in color than the adhesive material, as applied. Failure is usually by shear, but peel stresses or a combination of shear and peel can produce cohesion failure. Cohesion failures that occur in-the-field are typically caused by poor joint design, e.g., insufficient overlap length, or excessive peel forces. Excessive porosity (humidity exposure), and the presence of voids below a critical size can also result in cohesion failure. http://www.plasticsdecorating.com/ENEWS/ENews.asp?item=adhesivebondfailure[4/12/2012 1:48:02 PM]
  • 2. Plastics Decorating ENews Mixed-mode failures exhibit characteristics of both adhesion failure and cohesion failure because the interface is partially degraded. Essentially, this failure mode is a transitional phase in which the strength of the adhesive bond is lower than the cohesion failure strength. The use of surface pretreatments, either gas-phase glow discharge (such as corona discharge, flame and pressurized cold-gas plasma) or chemical primers, does not Join Our Email List guarantee robust adhesive bond strength results. Once you determine the adhesive Email: Join bond failure mode, the mechanism will guide you toward identifying and solving the critical problem(s). If cohesion failure, examine the product design joint and materials. If adhesion failure, scrutinize your manufacturing process! For Email Marketing you can trust Copyright 2010 Peterson Publications, Inc. Plastics Decorating Magazine 2150 SW Westport Dr., Suite 101 Topeka, KS 66614 (785) 271-5801 Fax (785) 271-6404 http://www.plasticsdecorating.com/ENEWS/ENews.asp?item=adhesivebondfailure[4/12/2012 1:48:02 PM]