外文翻譯---共射注塑成型技術(shù)-文庫(kù)吧
2025-01-02 23:07 本頁(yè)面
【正文】 射注塑成型技術(shù)來(lái)解決這個(gè)難題。他們將回收的廢塑料作為芯層原料，而使用新塑料作為膚層原料。這項(xiàng)技術(shù)可以有效減少對(duì)資源的使用、減少回收利用的費(fèi)用，從而減少?gòu)U棄塑料對(duì)環(huán)境做出貢獻(xiàn)。另為，使用共射注塑成型技術(shù)可以同時(shí)獲得幾種材料特性。最為普通的材料結(jié)合有實(shí)心的芯層和實(shí)心的膚層，或者實(shí)心的膚層和發(fā)泡的芯層。實(shí)心的芯層和實(shí)心的膚層的結(jié)合產(chǎn)生一系列的增強(qiáng)特性：減少了材料使用但增強(qiáng)了硬度，獲得了良好的表面光潔度并了剛度，表面是柔軟的但內(nèi)部確實(shí)硬的。實(shí)心的膚層和發(fā)泡的芯層同樣十分普遍。其主要思想是獲得空心泡沫結(jié)構(gòu)的好處并避免其缺點(diǎn)。一個(gè)空心泡沫結(jié)構(gòu)的芯層減少了材料的使用，降低了制品的重量和擁有高強(qiáng)度?？招呐菽Y(jié)構(gòu)的通常缺點(diǎn)是表面的光潔度，傳統(tǒng)的做法是對(duì)它們進(jìn)行拋光和油漆。用共射注塑成型技術(shù)獲得的實(shí)心的膚層和發(fā)泡的芯層，原本額外的處理工序不再需要并且能夠提供很好表面光潔度。共射注塑成型技術(shù)的最大缺點(diǎn)是必須使用復(fù)雜的注塑成型機(jī)。而共射注塑成型注塑成型機(jī)與傳統(tǒng)的普通注塑成型機(jī)相比過(guò)于昂貴。事實(shí)上，共射注塑成型技術(shù)使用的一些特殊設(shè)備比傳統(tǒng)的注射成型設(shè)備貴出了50%100%。由于出奇昂貴的價(jià)格，注射成型技術(shù)并沒(méi)有獲得很大范圍的接受。到1996年為止，也不到100臺(tái)注塑成型設(shè)備具有共射注塑成型能力。然而，隨著經(jīng)濟(jì)增長(zhǎng)的需要和以環(huán)境保護(hù)角度出發(fā)的資源利用使使用共射注塑成型技術(shù)成為一種選擇。Bemis公司正在利用共射注塑成型技術(shù)生產(chǎn)座便器。許多自動(dòng)車公司正在利用共射注塑成型技術(shù)解決汽車生產(chǎn)過(guò)程中造成的大量的廢棄塑料。附錄2 英文原文Introduction and Background:Along with extrusion, injection molding is the most prominent process for massproducing plastic products. It is a very versatile operation. Injection Molding allows for very plicated geometries and small dimensions. For example, the casing for disposable cameras is made via injection molding. The geometry for those pieces include several plicated curves, ribs, holes, protruding cylinders, and other elements. Even so, new applications and modifications of injection molding are being developed to increase the usefulness, applicability, and profitability of injection molding. One such emerging technology is that of coinjection molding.There are two main types of coinjection molding. The first is referred to as two color molding. In twocolor molding a part is molded using one resin, and then a second resin is molded into the first once it is sufficiently cooled after some part of the mold retracts or the part rotates to a second larger cavity. This technology is used in products such as puter keys and multicolored automotive taillights. The second, and more mon, type of coinjection molding involves the injection of a skin material and a core material. This is also known as “sandwich molding” because the core material is sandwiched in between the skin material. Sandwich molding is a variation of injection molding in which two different plastics are either simultaneously or in rapid sequence injected through the same gate. One material makes up the core of the product and the other makes up the skin. Through the bination of two different materials several benefits can be extracted that traditional injection molding can not supply by itself. Figure 1: Sandwich molding machine with a mon nozzle and a switchiead
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