Upload
cwesthouse
View
1.595
Download
6
Tags:
Embed Size (px)
DESCRIPTION
This presentation by Tom Rolando, Chief Technical Officer at Wisdom Adhesives, covers challenges with bookbinding adhesives. It includes information on different types of adhesives used in bookbinding as well as outlines challenges and solutions for warping, adhesion including coated stock adhesion, case making and set time.
Citation preview
“Bookbinding Adhesives Challenges”
Presented by Tom RolandoWisdom AdhesivesHBI/LBI 2010 Fall Conference – Springfield, ILOctober 23-26, 2010
Everybody Hates Their Glue “I don’t like my salesperson”
“The adhesive smells”
“The labels aren’t on correctly”
“Pricing is too high”
“The product isn’t running like the last batch”
“The truck-driver was rude”
“We don’t pay on time”
Everybody Hates Their Glue “The adhesive isn’t melting”
“The adhesive is drying too slow or too fast”
“I’m not getting the adhesion I need”
“The adhesives is too thin or too thick”
“Can I get this in a different container”
“Can the adhesive be made a different color”
Use of the Adhesive Protein Adhesive Waterbased PVAc Hot Melt PUR
Warping Coated Stock Adhesion Case Making Adhesion in General Set Time
Most Common Adhesives Challenges
Main Adhesive Technologies◦ Protein Adhesives
Finicky to run, susceptible to swings in the environment (summer/winter versions), moderate adhesion capabilities.
◦ Waterborne PVAc Adhesives Removal of water, set times.
◦ Hot Melt Adhesives Runnability (degradation, charring), adhesion to
difficult surfaces, brittleness.◦ PUR Adhesives
Runnability, Reaction to moisture.
Use of the Adhesive (Simple as )
Use of the Adhesive (Simple as )
Main Attributes◦ Selection◦ Runnability◦ Adhesion
Main Properties◦ Handling of the Adhesive◦ Determining Success of the Adhesive
Main Goal◦ Zero Defects
Likely the single biggest issue for binders involving the use of adhesives.
Many factors involved including:
board process adhesive
Warping
Warping Much written,
comparisons are general, specifics are limited.
Warping can be very costly involved re-working and/or re-binding of product.
Binder is having difficulty with warping in the late winter months.
Resolution: Summit meeting called with Binder, Board Supplier, Equipment Supplier and Adhesive Supplier.◦ Specify the moisture content of board and
density.◦ Apply consistent and minimal amount of
adhesive for both case-making and casing-in.◦ Control entire process for repeatability –
conditions, speeds, application weights
Warping - real life example
Adhesion to coated stock can be difficult.
Gloss, matte and plastic films (mainly PP, Nylon, PET) is difficult with all types of adhesive technologies (protein adhesives, waterborne PVAc adhesives, hot melts and PURs).
Binding to Coated Stock
Many factors to consider including:
◦ type of coating◦ surface tension of
coating◦ application
equipment
Binding to Coated Stock
Binder having difficulty with coated stock adhesion with hot melt spine adhesive.
Same coated stock, same hot melt adhesive as always used.
Resolution: Lab testing demonstrated that the coated stock had varied from previously used stock. Alternate hot melt used in the interim until stock depleted. Pre-testing saved the day.
Binding to Coated Stock - Example
Protein Adhesives predominately used on case making.
Viscosity and adhesion are keys to success.
Case Making
Binder ordered new casing making equipment. Case making adhesive was not performing (runnability and poor adhesion) on the new equipment.
•Case Making - Example
Resolution: On-site meeting with OEM, Adhesive Manufacturer and Binder to map out plan. Adhesive change to faster set and lower viscosity resolved runnability and adhesion issues.
•Case Making - Example
Difficult to adhere to surfaces.
Adhesion Issues
Case-making adhesive not adhering to new coated stock.
Adhesion Issues - example
Resolution: Know the surfaces you are bonding to.◦ Pre-testing the new
surface for adhesion to ensure current adhesive will work (it didn’t).
◦ Ask for help (supplier intervention).
◦ New product suggestion made, pre-test successful, scale-up on product.
Adhesion Issues - example
Set Time Issues
Binder having difficulty with line speeds on casing-in line during summer months. The adhesive appears to be setting slow.
Set Time Issues - example
Resolution: Conference call with the board and adhesive suppliers.◦ Higher humidity
environment means a change in conditions.
◦ Options are change environment, board moisture/density content or use summer & winter month adhesive. The later chosen.
Set Time Issues - example
An ounce of prevention◦ Can’t be emphasized
enough. Nothing can be done once the product is made.
Advanced testing◦ A must for any new items
or for troubleshooting existing ones.
Co-Supplier Meetings◦ Best approach to resolution
of issues, prevention and advanced testing a must.
Keys to Success
Selection of Adhesive Key to the Process. Match Performance with Expectation Based
on Ever-Changing Environments. Change Mentality from Hating Adhesives to
Loving Adhesives.
Wrap Up
Looking for a Greener Adhesive?
Looking for a Greener Adhesive?
Address each challenge from a new perspective.
Gather all applicable information:◦ Bonding what to what (determines adhesive technology)◦ Type of application equipment (determines physical property
of adhesive)◦ Expectation (determines performance properties like rate of
set, open time, application weight, etc.., economic impact)
Do it right the first time, however, be ready for ever-changing parameters.
The Wisdom Way
Thank You