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Keywords: parameterization; box library; folding cartons; packaging CAD
At present, the United States, Japan and other developed countries are committed to the development of professional packaging design software, computer-aided design has been widely used in the packaging industry, a more complete packaging CAD system can be applied to all aspects of the entire process of packaging CAD. China's packaging CAD technology started late. Although professional box design software has received more and more attention, practical applications are not many. Based on this, the author attempts to use AutoCAD as a platform, using the method of parametric design, comprehensive application of box library and box library technology, to develop a simple folding cartons plane design software with accurate drawing.
1 parametric design
Parametric design means that the size of the parametric model is represented by a corresponding relationship without the need to determine a specific value. Changing a parameter value will automatically change all dimensions associated with it and follow established constraints.
Analyzing the packaging carton on the market, we can see that most of the carton structures are specific, but the size of the carton, decorative patterns, and different packaging materials used. For these characteristics of the packaging structure design, the folding carton structure design system uses a parametric design method.
When using a parametric design to develop a folding carton structure system, the user does not have to use a drawing tool to draw lines by line, not to mention the relationship between the various sizes and to increase the paper thickness or reduce the paper thickness problem. Because these quantity relations have already been considered by the designer in the process of the program, the user only needs to select and input necessary parameters according to the prompts of the program, and the drawing of the graphics is automatically completed by the program.
2 box library technology and box library technology
2.1 Box Library Technology
For an integral box, it is generally composed of a box cover, a box bottom, a cymbal sheet, an end plate, and the like, and its structure is very strong, especially for a tubular folding box. For different overall cartridge types, the components are different, but generally have such a hierarchical structure. The basic pixels constituting the end are generally wired segments, circles (arcs), ellipses (arcs), Bezier curves, and the like. For convenience, regular polygons, stars, hearts, wavy lines, and the like may be added as basic pixels. The basic box-shaped components of the box type are constituted by these basic pixels, such as cover inserts, end plates, side plates, and the like. Each basic box type component constitutes a category, such as cover inserts, end plate rakes, and the like. Each basic box type component in the class is required to have different shapes depending on the use of the box type, structural requirements, aesthetics, and the like. Further, a combination of a box cover, a box bottom, etc. is formed by the basic box type assembly, and finally, the overall box type is formed.
2.2 Box Library Technology
At present, most of the packaging CAD systems, such as Founder packaging, ArtiosCAD software, and BOX-VELLUM systems, use the cartridge library technology, which includes a certain number of typical full-box database.
The box library stores some of the structural styles of folding cartons that are used frequently. By using these typical box types for design, the design speed can be greatly improved. The user only needs to select the desired box type and enters the appropriate length and width. , height, cardboard thickness and other parameters can be obtained in one operation, and the box type can be continuously expanded.
Most of the tubular folding cartons can be divided into three parts: box, lid, and bottom, and there are not many changes in the box. The lid and box bottom can be combined separately. Therefore, the tubular folding box is suitable for use. Box library technology. For other non-tube folding cartons, there are few similarities in each box type, and there is no need to use a cartridge library. Moreover, the software uses AutoCAD as a platform to draw out the overall box type. If it does not meet the established requirements, it can be modified with its powerful drawing and editing functions, which can make up for the deficiencies of the box type library.
3 Development of Folding Carton Structure System
3.1 System Development Tools
In many development software, using AutoCAD for secondary development is a shortcut. AutoCAD provides a complete, high-performance, object-oriented CAD program development environment. It also provides developers with a variety of new options. Its secondary development tools have also been continuously introduced, such as Auto LISP, Visual LISP, ADS, ARX, etc. VB, VBA, Visual Java and so on. This article uses the Visual LISP language as an example.
3.2 System Flow Chart
The data flow of the folding carton system runs through the entire process of the system, see Figure 1. 
Study on Design System of Folding Carton Based on AutoCAD (I)
[Abstract]: On the basis of studying the structural features of the unfolded folding carton and the design theory of the working line, the parametric design of the unstructured folding carton plane structure diagram is realized, and the folding paper based on Visual LISP is developed using AutoCAD as a platform. Box structure diagram system. The parametric design mainly uses box library technology to assist in the design of part of the cartridge library.