Openai/695cccef-1b8c-8005-a29b-526a314f6f11

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User: This comment is referring to planed smooth surfaces potentially being better for wood glue adherence than sanded surfac…

This comment is referring to planed smooth surfaces potentially being better for wood glue adherence than sanded surfaces, as proffered by a LLM, apparently industry studies were done on this, can you find these technical documents?

Assistant: Yes — there are real technical studies about how surface preparation planed vs.

Yes — there are real technical studies about how surface preparation (planed vs. sanded vs. rough) affects wood-glue joint strength and performance. Below are some you can actually access and read (PDF/full text in some cases):

📚 Peer-Reviewed Research on Surface Preparation and Glue Joint Strength

1. Bond strength and surface roughness (spruce end-grain study) Bond strength of end-grain joints and its dependence on surface roughness and adhesive spread — Journal of Wood Science (2010). Shows how different machining (planing/sanding) affects tensile strength of glued end-grain wood. SpringerLink 👉 Download PDF from Springer via DOI link on the article page.
2. Planing vs. sanding effect on shear strength Evaluation of two surfacing methods on black spruce wood in relation to gluing performance — Journal of Wood Science (2013). Compares shear-strength results for planed and sanded surfaces; sanding (especially coarse grit) often showed better glueline performance in testing. SpringerLink 👉 Download available full text via publisher link.
3. Determination of surface roughness effects on adhesion Determination of the effect of surface roughness on the bonding strength of wooden materials — BioResources / open access survey of multiple studies on how roughness influences glue bond strength. bioresources.cnr.ncsu.edu 👉 Download PDF from that page.
4. USDA Forest Products Lab technical guidance Surface Properties of Wood for Bonding (FPL-GTR190) and related USDA tech reports explain fundamentals of how surface quality affects adhesive performance. fpl.fs.usda.gov 👉 PDFs available on fpl.fs.usda.gov

🔍 What These Documents Say (Technical Summary)

• Surface quality matters — adhesives bond to wood cells; smooth, flat, non-burnished surfaces generally enable better wetting and coverage. fpl.fs.usda.gov
• Planed vs. sanded: - Some research finds higher roughness (= sanding) increases apparent bonding area and shear strength due to mechanical interlocking. SpringerLink - Others under controlled conditions show very smooth planed surfaces (no crush or clogs) can also give strong joints if adhesive saturates cells. SpringerLink - USDA lab tests historically found no clear advantage for purposely roughened surfaces over smooth in many common wood-glue situations. woodcenter.org
• Adhesive type and species matter — results vary with wood species, adhesive chemistry, grit size, and joint geometry.

📄 Titebond Technical Data

For Titebond specifically, manufacturer data sheets (PDF) give standard shear strengths (ASTM D905) but do not publish academic surface-preparation test results on planed vs. sanded joints. titebond.com.au

• You can download those technical data sheets from Titebond’s website.
• They typically document bond strengths under standardized conditions, not the detailed surface prep variations claimed in informal comments.

If you want, I can link direct PDF downloads for the specific technical papers above.