Veneer De-Lamination of particle board
Need a little help; I recently moved over to one of our other panel production plants. and we are experiencing (on a good day) 5x-6x the amount of veneer de-lamination. Both are hot press operation using identical setting 80-100psi applied, 7g-9g glue line by weight, 198F on the upper platten 195F on the lower. Both site use PVA-C white glue with a 90 sec cycle time. Veneer EMC is abt 4-6 in Canada plant and 6-8 in the MI plant (MI is having the de-lamination) We have tightened and flatened the splices which has significantly reduced the issue, along the splice lines, we have also improved the quality of the splice glue line (urea formaldehyde) which also helped. What remains tends to run with the grain, in random places. the common theme when we cut open the de laminated section is zero fiber pull from the particle board and it appears there has been no pressure applied. The press has a know bend in the platten but has been fitted with 2mm canvas blanket. we know where the bend is and stay away from that area. The occurances is random in that we will run random parts without issue then a 1 hour span we will see 4-6 parts. If I'm missing something here let me know
Replies to This Discussion
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Permalink Reply by Jim Tank on -
Bob- you have probably figgured your problem out by now, But I wonder if the problem is not in the press but the adhesive application or the cleanliness of the particle board. If the other plant is identicle, and you don't think the bend in the press is the problem, the only thing is the suitability of the materials and the applications of adhesive. Just wondering if the veneer comes fron the same supplier or if the heating elements are reliably functioning? Good luck, sounds like a fine after hours puzzle for you and a couple maint techs.
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Permalink Reply by Luca Tosetti (Italpresse USA) on -
Bob
This issue may be related to the material or to the equipment you're using now. All the other paramenters looks fine for me.
The fact that is not repeating this issue every cycle might be connected with a non proper calibration of the particle board or non precise thickness tolerances of the veneers.
Another aspect might be the equipment you're using. For sure the bent in the press platen is not gonna help for the quality of your lamination and the 2 mm canvas are anyway changing the uniformity of the temperature surface in that spot. Is your heating system water, oil or electric rexistances?
Let me give you one hint in case you're evaluating a new press: get it with solid steel platens (1.5" thick) because they'll last forever and will be impossible to damage them.
Regards
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