1、Unit 2 Material Consumption,Unit Objectives,After studying this unit, you are able to: 1.describe different types of printing and packaging materials 2.understanding conversations concerning material consumption 3.make conversations about material consumption 4.write an inter-office memo,1st. warmin

2、g-up,Task 1 Tell your partner about their general characteristics and applications Task 2 The symbols for package handling instructions are internationally standardized. Look at the following symbols and decide what each symbol stands for.,2nd. Reading A,Questions: 1. How many types of printing and

3、packaging materials do you know? What are they ? 2. Which type of materials do you prefer to use for packaging and why? List at least two reasons.,Printing and Packaging Materials,Paper and Paperboard Paper and paperboard became important printing and packaging materials around the 1900s. They have

4、the following advantages: Produced in many grades and forms Recyclable and biodegradable Easily combined with other materials to make coated or laminated packs Produced with different degrees of opacity,包裝印刷材料,紙和紙板 紙和紙板在1900年前后成為了重要的印刷承印物，它具備以下優(yōu)勢(shì)： 有許多不同檔次和種類 具有可回收性和生物可降解性 容易與其它材料相結(jié)合生產(chǎn)出各種涂層或?qū)訅喊b產(chǎn)品 具有

5、程度各異的不透明性,Paper qualities mainly differ in their surface treatment, such as coated or uncoated, textured or glossy. They are selected according to the purpose they need to fulfill. For example, uncoated paper has low reflection compared with high-gloss coated paper. The former is ideal for normal bo

6、ok printing, while the latter the choice for high-quality brochures.,紙張的各種特質(zhì)主要取決于紙張的表面處理，如涂層或非涂層、紋理或上光。人們因不同的用途選擇不同的紙張。比如，非涂布紙與高光澤的涂層紙相比反光率低。普通書籍采用非涂層紙就很理想，而高質(zhì)量的宣傳冊(cè)顯然就應(yīng)采用高光澤的涂層紙。,Paper can also be subdivided into fine and coarse papers. Fine papers are used for printing books and magazines, and coar

7、se papers for packaging. Paperboard is typical of coarse papers. It is a kind of multi-layer material, the inner layer of which is usually made from recycled fibers. Corrugated board is a widely used type of paperboards to make containers because it is light, strong and easily changed for all produc

8、ts.,紙張還可以細(xì)分成精制紙和粗制紙。精制紙用于書刊雜志的印刷，粗制紙則用于包裝。紙板就是典型的粗制紙。它是一種多層材料，內(nèi)層往往由回收的纖維制品再造而成。用于制作集裝箱的瓦楞紙板因其輕便、結(jié)實(shí)、易于量身定做等特點(diǎn)成為當(dāng)今使用最為廣泛的紙板之一。,Plastic material The use of plastics in packaging has accelerated rapidly since the 1970s, in large part because of their unique features: flexible, light, weighted, cost-effe

9、ctive, durable, unbreakable, hygienic and safe. Plastic has many variation, such as PVC in food packaging, or PET, a glossy film used for microwave trays and semi rigid containers. In printing, the selected plastic substrate usually determines the printing process to be used or the printing process

10、could help determine the substrate.,塑料材料 20世紀(jì)70年代，在包裝行業(yè)塑料的使用得到了加速發(fā)展，這在很大程度上是因?yàn)槠洫?dú)特的功能：靈活、輕便、造價(jià)低、持久耐用、不易破碎、衛(wèi)生及安全可靠。塑料產(chǎn)品有許多種類，如用于食品包裝的PVC或用于制作微波爐專用盤子及半剛性容器的高光澤薄膜PET。印刷過程中，所選擇的塑料承印物常常決定印刷工序，或印刷工序反過來決定塑料承印物的選用。,Metal materials Aluminum foil was adopted for packaging shortly after its initial production i

11、n 1913. As one of the major flexible packaging materials, it finds uses as a wrapper for a variety of products. Aluminum foil is generally laminated to paper or plastic films to increase ruggedness. When laminated to a polyester film, it becomes metallized polyester, which has outstanding barrier pr

12、operties and good printability.,金屬材料 鋁箔生產(chǎn)始于1913年，之后不久就用于包裝。作為一種主要的軟包裝材料，它被用于各種產(chǎn)品的包裝。通常人們將鋁箔層壓在紙張或塑料薄膜上以增強(qiáng)其堅(jiān)固性。當(dāng)人們將鋁箔層壓在聚酯薄膜上時(shí)，它就變成金屬聚酯，具有出色的阻隔功能和良好的印刷適性。,Glass Glass is a rigid packaging material that dose not alter its characteristics with the passage of time, nor dose it need additional treatment to make it impervious. Although glass is heavier and more breakable than plastic and aluminum containers, it will remain an important packaging material for certain prod