Paper Container Computer Aided Design

After years of development, China's packaging industry has formed a modern packaging industry system based on paper, plastics, glass, metal, decoration printing and packaging machinery and has a considerable scale. In 1997, the total output value of the national packaging industry reached 154 billion yuan, an increase of more than 20 times from 7.2 billion yuan in 1980. In the 40 major industries of the national economy, the packaging industry has risen to 14th place. With the improvement of people’s living standards and environmental protection awareness, the use of paper products such as paper boxes, cartons, paper bags, paper cups, paper trays, paper drums, paper cans, paper tubes, etc. has become increasingly widespread. In 1997, China reached 15.54 million tons of packaging paper and paperboard, ranking first in the six major packaging industries. The United States is the world’s largest consumer of paper and paperboard. In 1995 alone, the paper and paperboard consumption amounted to US$45.5 billion, accounting for 44.8% of the total US packaging consumption that year. Take a typical sales packaging container - folding carton, it is not only widely used in food, medicine, daily necessities, handicraft packaging, but also for the packaging of soft drinks, milk, detergents, cultural and educational supplies, hardware products. Take the United States as an example. In 1994, the annual output of folding cartons was 3.255 million tons, and the total sales volume was 4.925 billion US dollars. Since the folding cartons have low processing costs, are easy to store and transport, are easy to sell and display, are suitable for automated packaging, have good recycling, and are conducive to environmental protection, etc., worldwide, people's demand for folding cartons will increase. Will continue to increase.
...... On the basis of analyzing the characteristics of the carton structure, the design principle of the size of the folding carton is explained, and the main functions and design methods of the carton CAD are introduced.

The first section of the carton structure features and design principles

1. According to the production method of the trays, there are manual trays and mechanism trays.
2. According to the shape of the paper box, there are: square, round, flat, polygonal, shaped paper box and so on.
3. According to the packaging object to be divided into: food, cakes, pharmaceuticals, cosmetics, daily necessities, stationery, instrumentation, chemical packaging cartons and so on.
4. According to the material characteristics, there are: flat paper box, full-bonded cardboard box, fine corrugated cardboard box, and composite material cardboard box. 5. According to the thickness of the cardboard, there are: thin cardboard box, such as white paper box, card board paper. Boxes, tea trays; thick-walled cartons: box-board cartons, yellow-sheet cartons, corrugated cartons.
6. According to the structure of the carton and the form of sealing points, there are folding cartons, rocker-type carton, cover (buckle) type carton, drawer carton, folding type (ie, packaging) carton , Gland-type carton.
7. According to the supply form, there are two kinds of folding cartons and fixed cartons.

Second, the principle of carton structure design
　　 1. Calculation of the processing dimensions of the cassette 2. Folding carton structure Insert box cover (2) Box size calculation (3) Design of the bottom structure size 3. Functional structure of the folding carton

Section 2 Carton CAD Software Modules and Functions
　　 In general, the task of the interactive graphics software is to complete the work of creating, editing, modifying, and dimensioning the graphics with high quality and speed, and finally obtain a complete design drawing. If you apply a drawing of a subroutine in a drawing package, follow these steps:
1 Analyze the original 2 Build a mathematical model 3 Draw a box 4 Write a program

First, the carton box structure CAD software function module carton box piece structure design software includes basic graphics generation module, size (symbol) tagging module, die cutting line selection module, graphics editing management module, cassette library management module, Style management module and output module, as shown.

Second, the main functions of carton box piece structure design software A complete CAD system should have the following basic functions: a). Quick calculations, generate graphics; b). Store a large number of programs and data information, and can achieve rapid inspection; c) The man-machine interactive communication operation function; d) has the shape of the input graphics, the means of design parameters; e). Output data information and graphics.
For the carton structure CAD system, in addition to the above basic functions, it should also have the following functions:
1. Good user interface 2. Basic drawing function 3. Graphic editing function 4. Establishment and use of common cassette library 5. Marking dimensions, characters 6. Optimizing nesting materials 7. Exporting graphics, transferring data

Section Folding Carton Expansion Drawing CAD Software Introduction
Now we introduce a structural program design software ZHCAD for folding cartons. This software structure is clear, simple and practical, and has a good user interface. The user can search and call the common cartridge graphics library, and freely design or combine the required cartridge types. After human-machine dialogue, automatic dimensioning and automatic ejection can be achieved. The output cartridge structure diagram and the die cutting marker can be output. . Figure 8-13 shows the ZHCAD software structure flow chart.
1. After running ZHCAD under DOS, the user interface can directly enter the operation area. The upper left part is the drawing area, the upper right part is the text (program) area, and the lower part is the menu area. (See photo)
1. Main Menu 2. Text Menu 3. Disk Drive Menu 4. Display Screen Graphic Menu 5. Die Cut Line Selection Menu 6. Cartridge Marker Menu

Second, the establishment and call of the library

Third, the folding carton development plan design 1. Free design For the basic form of the inserted folding carton (as shown in Figure 8-14), the application of the design principle of the adhesive edge and the cassette 1,2,4, The 5 part is drawn and then the symmetry is used to copy the rest.
Example: Inserted folding carton with the length, width and height (A=70mm, B=50mm, H=60mm, respectively) of the trial design (board thickness Ma = δ = 0.7mm).
1) Basic form design 2) Design of self-locking lock insert cover 3) Design of insert cover with self-locking buckle and backlash 2. Deformation design 3. Modification function

Fourth, automatic dimensioning

Fifth, optimize the nesting <br> Use the nesting submenu to arrange the die-cut sheets on the specified board web. As shown in the figure, the self-locking bottom folding carton shown in the figure is 750,500 (mm) in different arrangements.
Form a number of material area A 9 721.50473.50
B 6 642.00446.00
C 6 509.50446.00
D 9 732.50473.50
It can be seen that when using the forms A and D to discharge, a maximum of 9 cassettes can be arranged, and forms B and C can only be arranged at most 6 cassettes. Explain that the use of A, D form, equivalent to increased utilization of paperboard (9-6) / 6 = 50% ... ...