Computer aided design of the hottest paper contain

After years of development, China's packaging industry has formed a modern packaging industry system based on paper, plastic, glass, metal, decoration printing and packaging machinery, and has a considerable scale. In 1997, the total output value of the national packaging industry reached 154billion yuan, an increase of more than 20 times from 7.2 billion yuan in 1980. Among 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 awareness, the packaging of paper products such as cartons, cartons, paper bags, paper cups, paper trays, paper barrels, paper cans, paper tubes and so on is more and more widely used. In 1997, the national packaging paper and paperboard reached 15.54 million tons, ranking first among the six major packaging industries. The United States is the country with the largest consumption of paper and paperboard in the world. In 1995 alone, the consumption of paper and paperboard reached US $45.5 billion, accounting for 44.8% of the total packaging consumption of the United States that year. Take the typical sales packaging container folding carton for example, it is not only widely used in the packaging of food, drugs, daily necessities and handicrafts, but also used in the packaging of soft drinks, milk, washing supplies, cultural and educational supplies and hardware products. Take the United States as an example. In 1994, the annual production of folding cartons was 3.259 million tons, and the total sales volume was 4.925 billion US dollars. Because folding cartons have the characteristics of low processing cost, easy storage and transportation, easy sales and display, suitable for automatic packaging, good recycling, and conducive to environmental protection, the demand for folding cartons will continue to increase all over the world

next, based on the analysis of the structural characteristics of the carton, the design principle of the structural dimensions of the folding carton is explained, and the main functions and design methods of Carton CAD are introduced. Section I structural characteristics and design principle of carton

I. overview

1 According to the production methods of cartons, there are: manual cartons and machine-made cartons

2. According to the shape of the carton, there are: square, round, flat, polygonal, special-shaped carton, etc

3. According to the packaging objects, there are: food, cakes, drugs, cosmetics, daily necessities, cultural goods, instruments and meters, chemical packaging cartons, etc

(4) regularly replaced parts 4 According to the characteristics of materials, they are: flat carton, fully bonded cardboard box, fine corrugated cardboard box, composite cardboard box

5 According to the thickness of the cardboard, there are thin paper boxes, such as white paper boxes, cardboard boxes, tea paper boxes; Thick board carton: such as box board carton, yellow board carton and corrugated carton

6. According to the structure and sealing form of cartons, there are folding cartons, shake cover cartons, cover (buckle cover) cartons, drawer cartons, folding (i.e. packaging) cartons, and gland cartons

7. According to the form of supply, there are two kinds of folding cartons and fixed cartons. 2、 Design principle of carton structure size

1 Calculation of box processing size

2 Folding carton structure

plug-in box cover

(2) box size calculation

(3) design of box bottom structure size

3 Functional structure of folding carton

section 2 Carton CAD software module and function

generally speaking, the task of interactive graphics software is to complete the generation, modification and dimensioning of graphics with high quality and speed, and finally obtain perfect design drawings. If the subroutine in the drawing software package is used for drawing, the following steps should be followed:

① analyze the original

② establish a mathematical model

③ draw a box

④ write a program

1. The function module of the carton structure CAD software

the carton structure design software mainly includes the basic graphics generation module, dimension (symbol) annotation module, die cutting line selection module, graphics management module, carton library management module The culture and sports management module mainly has the following four characteristics: 1. It is a system and output module, as shown in the figure

II. Main functions of carton and sheet structure design software

a perfect CAD system should have the following basic functions: a) Fast calculation and graphics generation; b）. Store a large amount of program and data information, and realize rapid inspection; c）. It has the operation function of human-computer interaction communication; d）. It has the means to input the shape and size of graphics and design parameters; e）. Output data information and graphics

in addition to the above basic functions, the carton structure CAD system should also have the following functions:

1 Take the spring on the vehicle for example, good user interface

2 Basic drawing function

3 Graphics function

4 Establishment and use of common box and piece library

5 Dimension and character

6 Optimized layout

7 Output graphics, transfer data

section 3 folding carton deployment B. room temperature is 10 ℃ (3) introduction to 5 ℃ drawing CAD software

this paper introduces a structured programming software zhcad for folding carton deployment drawing. This software is clear in structure, simple and practical, and has a good user interface. Users can not only retrieve and call the commonly used box graphic library, but also freely design or combine the required box type. Through man-machine dialogue, automatic dimensioning and automatic nesting can be realized, and the box structure drawing and die cutting nesting drawing can be output. Figure 813 shows the zhcad software structure flow chart

I. user interface

after running zhcad under DOS, you 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 Figure)

1 Main menu

2 Text menu

3 Disk tube menu

4 Display screen graphic menu

5 Die cutting line selection menu

6 Box and sheet layout menu

II. Establishment and call of box and sheet library

III. program design of unfolded drawing of folding carton

1 Free design

for the basic form of plug-in folding carton (as shown in Figure 814), the design principle is applied to draw the bonding edge and parts 1, 2, 4 and 5 of the carton, and then use its symmetry to copy the rest

example: try to design a plug-in folding carton with length, width and height of a=70mm, b=50mm and h=60mm respectively (cardboard thickness ma= =0.7mm)

1) basic form design

2) design self-locking buckle insert cover

3) design insert cover with self-locking buckle and side gap

2 Deformation design

3 Modify function

4. Automatic dimensioning

5. Optimize nesting

use the nesting submenu to arrange the box die-cutting diagram on the specified cardboard format. As shown in the figure, the self-locking folding carton shown in the figure is discharged on the paperboard with a size of 750500 (mm) according to different arrangements

number of forms arrangement material area

a 9721.50473.50

b 6642.00446.00

c 6509.50446.00

d 9732.50473.50

it can be seen that when forms a and D are used for material arrangement, at most 9 boxes can be arranged, while forms B and C can only be arranged at most 6 boxes. It shows that the use of a and D forms is equivalent to an increase of (96)/6=50% in the utilization rate of paperboard