planning and manufacturing personnel often ignored knitting bags way, the result is that, although the draft plan elaborate, but made ??out of woven products is not perfect, and even become waste. Experience to inform us, as long as the common varieties of packaged goods on the basis of knowledge, competence indulge open planning ideas, roots will never meet the planning book bag technology, planning the useful, the perfect product packaging. Plastic bags can be divided into three sides by the bag sealed, the bottom seal, three-dimensional letters and flakes in four categories. Trilateral closure is sealed in bags around, positive, scale back the scale are products, with all the sense of inevitable, planning is not binding, and the opposition has a certain continuity planning. Due to the positive and negative scales together, planning can be a positive, so negative and positive care. When the plate are back to the same set of arrangements on the plate cylinder. The opposite end of the seal in the sealing, the positive scale of products scale, two opposite flat