In the design and production process, attention should also be paid to the operability of the bag making and slitting process. Some designs do not consider the errors in the bag making and slitting process, which makes the bag making and slitting difficult.

1. Around should be designed for similar color or transparent

The periphery of the composite bag should be designed to be similar color or transparent. If the color contrast between the top, bottom, left and right of the packaging bag or coil is large, there will be obvious contrast at the imposition place after the vertical and horizontal imposition.

Because the slitting of bag making machine, slitting machine and automatic packaging machine can not be absolutely accurate, generally there is a deviation of more than 1mm, so the bag or slitting film will have a large contrast line at the cutting place, thus affecting the appearance. For high-strength composite bags and retort bags, in order to improve the strength and protect the ink layer, it is recommended that the color is not printed around the composite bag. For a large area of the background color, in the absence of a transparent edge of the design, the plate making process must be considered after the imposition of both sides of the width of 1-2mm. In this way, in the slitting and bag making process, even if there is deviation, there will be no transparent edge or aluminum foil, aluminum plating edge

2. The design of bag-making manuscripts should pay attention to the size of the bag-making and the horizontal and vertical output.

In the design of the bag-making manuscript, attention should also be paid to the size of the bag-making and the horizontal and vertical problems.

Generally, the thickness of the bracket of the heat sealing knife of the three-side sealing bag making machine is about 70mm, so the minimum width of the bag is 70mm when the bag is made. When the bag is made horizontally, the bag can be set back to back, and the minimum length of the bag is 35mm. If the bag size is smaller than the above size, it is necessary to make a special heat sealing knife. As the composite hot edge is not heat-sealed position may be mixed with some foreign matter, and can not be cleaned, some foreign matter will deteriorate and give off peculiar smell. If the customer has the requirement that the heat sealing edge does not allow the surplus edge, the bag must be made horizontally.

3. Fully consider whether the contrast between the color of the text pattern and the background color is strong

Human eyes are identified by the contrast between the text pattern and the background color, so in the design, we should fully consider whether the contrast between the color of the text pattern and the background color is strong, and avoid using similar colors, otherwise the contrast is small and easy to cause blur.

If there is no background color, and the text pattern is small or its color is lighter, it can not be combined with the glossing surface of aluminized film or pure aluminum foil, otherwise it is difficult to identify the text pattern due to the "flashing eyes" of the glossing surface of aluminized film or aluminum foil.

4. Color design and ink use pay attention to the heat resistance and light resistance of the color

In the process of color design and ink use, attention should also be paid to the heat resistance and light resistance of the color.

Some special color heat resistance is not good, should consider in the printing drying, bag heat sealing and other processing and high temperature to sterilization and other use process will change color. For outdoor use or long-term exposure to strong light products should consider its light resistance.