a non - disassembling partition assembly for insertion into a container for dividing the space inside the container into separated cells . the assembly comprises a plurality of first slotted partitions intersecting with a plurality of second slotted partitions to form a matrix . the matrix is held together in a non - disassembling collapsible relationship by a plurality of weldments at a plurality of intersections . each weldment is formed by injection of molten plastic between opposed face plies of intersecting partitions at an intersection at a sufficiently high temperature , to at least partially melt the spacers betweeen the face plies of the intersecting partitions to create a weldment therebetween . the weldments are formed of a plastic which is preferably the same type of plastic as that from which the partitions are made in order to aid in the recyclability of the partition assembly .