外文文献出处询问 找到下面所示那篇英语文献来自哪里？哪本书第几页

原文在这：Introduction and Background:Along with extrusion, injection molding is the most prominent process for mass-producing plastic products. It is a very versatile operation. Injection Molding allows for very complicated geometries and small dimensions. For example, the casing for disposable cameras is made via injection molding. The geometry for those pieces include several complicated 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 co-injection molding.There are two main types of co-injection molding. The first is referred to as two color molding. In two-color 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 computer keys and multi-colored automotive taillights. The second, and more common, type of co-injection 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 combination of two different materials several benefits can be extracted that traditional injection molding can not supply by itself. 这是译文：简介和背景注塑挤压成型法是大规模生产塑料制品最卓越的生产工艺。它是一种非常通用的生产方法。注塑成型允许生产几何形状非常复杂和几何尺寸非常小的塑料制品。例如，一次性照相机的外壳就是通过注塑成型的方法生产出来的。像这一类塑料制品的几何性状经常包括着几条复杂的曲线、筋板、孔洞、圆柱型的凸台和其他一些复杂结构。到目前为止，为了进一步增强注塑成型法的有效性，扩大其适用范围和增加收益率，注塑成型法的新的应用和改良被不断发展。共射注塑成型技术（Co-injection Molding）于是开始出现。现在主要有两种类型的联合注塑成型技术。第一种被成为双色成型法。双色成型法的工艺过程是先向模具中注射进一种树脂材料，然后抽回模具的一部分零件（增加型腔空间）或将已成型的制品转入到一个更大的型腔，并使其充分冷却后，注射进第二种树脂材料。这种技术被用来生产像计算机的按键和汽车的双色尾灯之类的制品。第二种技术则更为普通，用第二种技术生产出来的制品通常包含不同的肤层材料和芯层材料。就像我们所熟知的“夹心三明治”一样，因为芯层材料被包围在肤层材料之间。夹芯成型技术是将两种不同的塑料原料同时或者快速依次通过同一个浇口的有效注塑成型方法。一种塑料原料用来形成制品的内部结构，另外一种塑料原料组成制品的表面。通过组合两种不同的塑料原料可以获取原本传统注塑成型方法所无法提供的好处。

day as far in the future. When we