傳統製造業的生產模式隨著科學技術的發展及市場需求狀況而不斷發展變化。而現今要求快速的多元化、個性化的需求商品開始因應而生，買方市場的時代到來。此時市場對單一種類的產品需求量急劇減少，製造業普遍面臨著大量生產模式轉換為少量多樣的客製化商品需求。客戶的下單習慣已轉向少量多樣、生產週期要求更短，需求變動也愈趨頻繁研發速度、庫存備料、訂單進度、生產效率、換線換模、交期承諾、品質要求，要調整可不只是這些，企業的挑戰這時正要開始......。
於是，過去的大量生產模式被現代多種少量且具有相同低成本的生產模式所替代就成為必然趨勢。在這個生產模式轉變過程中，對於少量多樣生產模式中產線的換模、換線應變能力將成為主軸。現在客戶對於產品需求是種類多數量少，交期又要短，為了達到客戶得期望生產製造就要能因應多種類小批量的訂單生產模式。因此快速換模換線的能力顯得非常重要，然而頻頻換模換線卻讓許多工廠產線大傷腦筋，因為它浪費了生產時間，降低了生產效率。
而快速換模換線是一種快速和有效切換產品生產製造工序的方法之一，縮短在切換時生產停頓的時間進而增加生產效率。本個案將就對塑膠射出成型的快速換模方式與技法作探討，因小量多樣生產緣故每台射出成型機的生產有效工時如果太低而無效工時高，將成為少量多樣生產模式的一大障礙，其中決定無效工時的長短則以換模時間的長短為主軸。

The production mode of traditional manufacturing industry is constantly evolving with the development of science and technology plus the market demand. Not only that, the demand of fast, diversify and personalized products has begun to take place, and the era of the buyer's market has arrived. At this time, the demand for a single type of product has been drastically reduced, and the manufacturing industry is generally faced with the need to convert a large number of production modes into a small variety of customized products. Customer's order habits have shifted to a small number of diversification, production cycle requirements are shorter, and demand changes are becoming more frequent. R&D speed, inventory preparation, order progress, production efficiency, changeover, delivery commitment, quality requirements, adjustments are not just all of these, the challenges of the enterprise are just beginning to start too...
As a result, the mass production in the pass has become an inevitable trend by replacing a large number of modern production models with the same low cost. In this production transition process, the changeover capacity of the production line in these small quantities and variety production methods will become the main axis. Furthermore, customers require large number products with a short delivery time. In order to meet this expectation, they must be able to come out a Variety-Small Batch Order Production Models. Therefore, the ability to quickly change the mold becoming very important, but too frequent of change molds has made many factories a big headache because it wastes production time and reduces production efficiency.
However, the rapid mold and line change is one of the methods to quickly and effectively switch the manufacturing process, shortening the pause time and increasing the production efficiency. In this case, we will discuss the rapid mold change method and technique for plastic injection molding. Due to the small quantities of the products, the time of each injection molding machine is too low and the labor time is too high, which will become a major obstacle, which the length of the invalid work time is determined by the length of the mold change time.

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