機用纏繞膜具有維修功能的一個前提條件是勻稱性，卷繞膜的特性一方面取決于原材料的選擇，另一方面則取決于膜的薄厚度，一般薄厚越大，纏繞膜的特性越高，纏繞膜的特性就越高，纏繞膜的特性已經保持穩定，不容易隨厚度的提高而增加。

A prerequisite for the maintenance function of machine winding film is symmetry. The characteristics of winding film depend on the choice of raw materials on the one hand, and on the other hand on the thin thickness of the film. Generally, the greater the thickness, the higher the characteristics of winding film, the higher the characteristics of winding film. The characteristics of winding film have remained stable, and it is not easy to increase with the increase of thickness.

較薄、較高的原材料價格會較高，從而使卷繞的總成本急劇上升，使用多層高層復合纏繞膜可有效降低包裝成本，但薄厚的操縱難度系數很大。

The price of thinner and higher raw materials will be higher, resulting in a sharp rise in the total cost of winding. The use of multi-layer high-rise composite winding film can effectively reduce the packaging cost, but the handling difficulty coefficient of thin and thick is very large.

如果薄層厚度不夠均勻，容易出現作用薄弱環節，造成機用纏繞膜整體性能不穩定，將會出現部分周轉材料特性較弱，導致商品達不上需要有的有效期，而且對部分纏繞膜(分外性能)的性能也會受到一定影響，從而影響到產品的性能。

If the thickness of the thin layer is not uniform, it is easy to have weak links, resulting in the instability of the overall performance of the machine winding film. Some revolving materials will have weak characteristics, resulting in the goods not reaching the required expiry date, and the performance of some winding films (extra performance) will also be affected to a certain extent, thus affecting the performance of the products.

機用纏繞膜厚勻稱是否也會給纏繞膜包裝印刷及其相關應用的工藝流程難以提升。例如，包裝印刷在市場上常見的凹版印刷機，對包裝印刷支撐力的控制是保證宣傳品質量的關鍵，支撐力的操縱與卷材、薄板、薄層厚度的勻稱性常有關聯，操縱不太好能立即造成原材料的套印。此外，纏繞膜的薄壁勻稱能力差，也會導致卷繞膜包裝印刷后出現收卷偏位的情況。

Whether the uniform thickness of machine winding film will also make it difficult to improve the process flow of winding film packaging and printing and its related applications. For example, in the gravure printing machine commonly used in the market for packaging printing, the control of the supporting force of packaging printing is the key to ensure the quality of publicity materials. The control of the supporting force is often related to the symmetry of the thickness of coiled materials, thin sheets and thin layers. Poor control can immediately cause overprint of raw materials. In addition, the thin-wall symmetry of the winding film is poor, which will also lead to the winding deviation after the packaging and printing of the winding film.

高密度復合薄膜在制做全過程中，任意一層纏繞膜的薄厚不均勻都是造成事后生產加工的不均勻性，導致纏繞膜薄厚勻稱性差。該產品適用于外包裝，厚度不均勻的機用纏繞膜，作外包箱使用時，周轉材料容易出現物理性能薄弱環節，假如在包裝、運輸、貯藏、市場銷售全過程中，周轉材料遭受很大的外力沖擊，這種薄弱環節易出現裂縫、孔眼等導致原材料的儲存作用下降或立即喪失。

In the whole process of making high-density composite film, the uneven thickness of any layer of winding film is caused by the uneven production and processing after the event, resulting in the poor uniformity of the thickness of winding film. This product is suitable for outer packaging. When the machine winding film with uneven thickness is used as an outsourcing box, the reusable materials are prone to weak links in physical properties. If the reusable materials are impacted by great external forces in the whole process of packaging, transportation, storage and marketing, such weak links are prone to cracks, holes, etc., which will lead to the decline or immediate loss of the storage function of raw materials.