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 below, and the main functions and design methods of the carton CAD are introduced.

The first section carton structure characteristics and design principles

I. Overview

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 characteristics of the material to be divided into: flat carton, full adhesive cardboard box, fine corrugated cardboard box, composite cardboard box

5. According to the thickness of the cardboard to be divided into: thin cardboard boxes, such as whiteboard cartons, card board cartons, tea board cartons; cardboard boxes: such as box board cartons, yellow board cartons, corrugated boxes.

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

Plug-in lid

(2) Calculation of box size

(3) Design of the bottom structure size

3. Functional structure of folding cartons

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 Analysis of the original

2 Establish a mathematical model

3 draw a frame

4 Write a program

First, the carton box structure CAD software function module

Cartridge box structure design software mainly includes basic graphics generation module, size (symbol) annotation module, die-cut type selection module, graphics editing management module, cartridge library management module, style management module and output module, as shown in the figure .

Second, the main function of carton box 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). Man-machine interactive communication operating functions; d). Has the shape of the input graphics, the design parameters of the means; 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 graphics editing function

4. The establishment and use of commonly used cartridge libraries

5. Label size, character

6. Optimize the nesting

7. Output graphics, pass 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.

First, the user interface

After running ZHCAD under DOS, you can directly enter the operating area. The upper left is the drawing area, the upper right is the text (program) area, and the lower is the menu area. (See photo)

1. Main menu

2. Text menu

3. Disk management menu

4. Display screen graphic menu

5. Die Cut Line Selection Menu

6. Cartridge layout menu

Second, the establishment and call of the library

Third, the program design of folding cartons

Free design

For the basic form of the insert folding carton (as shown in Fig. 8-14), apply the design principle to draw the adhesive edges and sections 1, 2, 4, and 5, and use the symmetry 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 self-locking lock insert cover

3) Design insert cover with self-locking buckle and backlash

2. Deformation design

3. Modify the function

Fourth, automatic dimensioning

Fifth, optimize the layout

Use the nesting submenu to arrange the die cut charts 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%