Hello jdsfrance, the coffee pods that are made up of paper on both sides and coffee in between are heat sealed. The two layers of paper are put under a lot of pressure, which generate a lot of heat, but not enough to burn the paper, to make the paper fuse to each other. No glue is applied.
When I lay them on the top of the soil to act as a mulch, they do not last long because the worms come up from the soil below and take them apart piece by piece, including the paper edges. In just a couple months, all you see is black earth. One method I use if I just want the coffee grounds for a project, is rub them over a piece of expanded metal, the type with the diamond shaped holes. Paper stays on top of the grate and grounds go to the container below. It is like grating cheese. The paper I then put into the compost pile. Wear gloves if you do this, or tear them apart, because your hands will absorb the caffine still in the pod. After doing 300 or more without gloves, I do not sleep that night and the heart goes fast.
I do not like the K-cups, Tassimo, Boedecker, Brew-1 or any of the other plastic or metal cased coffees. We make machines at the place I work that uses the pods, and their waste bins have labels on them that say compostables. I have a customer up in the North East that delivers an empty tub along with the fresh coffee pods to his customers. When they come back to service the customer next week they deliver another empty tub, more coffee, and pick up the used pods and they compost them. This gives their customer a smaller carbon foot print, they sold the pods to them, and now they sell those pods again to gardeners as compost. Talk about increasing your profits, selling the same pod twice.