加工工艺方面

国外企业在收边的外侧，都做约5毫米的130度回转卷边，既提高收边的强度，使得收边安装后平挺，又使收边外侧彩板断口得以掩饰。而国内企业基本没有这道工序，所以，收边安装后既不平挺（收边起波浪），也不美观。

在收边造型方面

国外各大企业都有各具特色的漂亮的收边造型，比如abc（上海美建）、butler（巴特勒）、metallic（马泰力克）、zamil（科威特匝米尔）等，都有与别人不同的美观的收边造型，而国内企业基本是一种简单的槽形边，显得很单调。当然，收边的选择也有色彩的问题。

Machining process

Do foreign companies on the edge of the lateral, about 5 mm 130 degree rotation edge, can not only improve the strength of the edge, making on after installation was flat, and to hide on the lateral color plate fracture. And domestic enterprises basic not this process, therefore, as both uneven after installation (as on a wave), not beautiful also.

In closed shapes

Foreign companies have different characteristics of beautiful shapes, such as ABC (Shanghai), butler (butler), metallic (matei rick), zamil turn mill (Kuwait), etc., are different from other people and beautiful shapes, and domestic enterprises is basically a simple trough, appear very dull. Of course, there are also as the choice of a color.

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