油桶生产除中缝焊接外,两端的底盖都是多层咬边后压平而成(图1)。目前也有部份产品光咬边不压平,叫圆卷边(如图2)。不管咬边后压平,或是圆卷边,它们都需在未咬边之前刷一层传统的工艺红糖骨胶作填料,使油桶成型后不渗漏。 In addition to the production of oil drum seam welding, both ends of the bottom cover are multi-under-biting after flattening (Figure 1). At present there are some products not bitten light side flat, called round curling (Figure 2). No matter under the flatten after the undercut, or round curling, they are required to brush before not undercut a layer of traditional brown sugar glue as a filler, so that after the formation of oil drums do not leak.