Plastic box classification editing by material classification: PP plastic box, PVC plastic box, PET plastic box, etc. according to the box type: cylindrical plastic box, square plastic box, shaped plastic box, soft plastic box, beer and so on.
Production process
1. Plate making: CTP plate making is commonly used in plastic box making.
2, selection of materials: general plastic box packaging are made of PET, PVC, PP and other materials, PVC, PET thickness is mostly 0.10-0.0.55, PP can be as thick as 0.75MM, because the material is too thick The plastic box is too hard and looks very dull.
3, printing: the outside of the plastic box will not be printed, at most it is only silk screen, because the plastic box is the outer box, so the printing requires a high process, the most taboo color difference, ink points, faded these affect the aesthetic shortcomings.
4, surface treatment: plastic box packaging usually to do surface treatment, the common is over-glued, over-matt, over uv, over-oil, over dumb oil. It is also the offset printing we said.
5, beer (die cutting): beer is a more important part of the printing process, to be a must-have knife must be accurate, if the beer is not allowed, beer, beer, these will seriously affect the subsequent processing.
6, film: the usual prints are first through the film after the beer, but the plastic box is the first beer after the film, one is afraid of flower packaging, the second is the plastic box to pay attention to the overall beauty, plastic box film material must be handmade Production, this can achieve a certain beauty.
7. Sticky box: After the laminating machine, it needs to go through the sticking process (automatic sticking box, artificial sticking box), the sticking box needs to pay attention to the choice of glue, different materials need different types of glue
Characteristics: The properties of PVC, PTE and PP of plastic box materials determine the quality of printing ink color. Only raw materials with good performance can obtain better color rendering effect. Therefore, a correct understanding of the relationship between the performance of the plastic box and the color of the printed product, according to the characteristics of the printed product and process conditions, the reasonable selection of high-quality raw materials for printing, has important practical significance for improving product quality.
1. The relationship between the smoothness of the plastic box and the color rendering effect is a technical index for evaluating the degree of unevenness on the surface of the plastic box, and is a physical quantity indicating the smoothness, smoothness and uniformity of the surface of the plastic box, that is, a certain volume under a certain vacuum condition. The air is measured in terms of the time it takes between the test piece surface and the smooth glass surface under a certain pressure, and the unit is expressed in seconds. The higher the number of seconds, the better the smoothness of the box. The better the smoothness of the plastic box, the more uniform and complete the contact between the surface of the material and the printing plate during printing, the more the ink layer on the surface (the relief) or the blanket is transferred, and the better the color rendering effect of the printed product. On the contrary, the raw material of the plastic box with poor smoothness, the ink transfer is uneven, insufficient, and the surface of the raw material has a strong permeability to the ink amount, and the color rendering effect is also poor, and it is easy to make the printed ink color and light. Therefore, the finer printed products, the finer the network cable and the smaller the diameter of the dot, the more the raw material should be printed with a smooth plastic box, so that the original can be reproducible.
2, the relationship between the gloss of the plastic box and the color effect. The gloss of the plastic box refers to the degree of specular reflection on the surface of the plastic box, expressed as a percentage. The higher the gloss of the plastic box, the more the surface can reflect light like a mirror, and the brighter the appearance. In fact, in addition to the specular reflection on the surface of the plastic box, there is diffuse reflection, which causes the gloss of the plastic box to decrease. The high-gloss plastic box raw materials, the brighter the printed ink color, and the visual effect of the ink color. It can be said that the smoother the raw material of the plastic box, the higher the gloss, and the higher the gloss of the printed product. The gloss and smoothness of the raw material of the plastic box are closely related, but the gloss is not smooth. The shiny surface of the plastic box raw material is not necessarily a smooth surface. From the point of view of the gloss characteristics of the raw materials of the plastic box, it is very practical to select the appropriate plastic box raw materials for printing according to the characteristics of the printing. For example, if the layout is text-based, the paper with gloss should be used to avoid reflection, so that the eyes will not be tired for a long time. For the printing of the plate-based layout, it is advisable to use PVC, PET and PP materials with high gloss to make the printed ink color uniform, thick and bright.
Scope of application: Since the plastic box is more expensive than the traditional carton packaging, it is required by the country to be environmentally friendly and green in the printing industry. The advantages of plastic boxes are increasingly apparent. At present, the most widely used plastic boxes are baby industry, cosmetics, digital products and so on. Entry Label: food, life
The birth of the exquisite plastic box must be the production process of the automatic plastic box machine.
PP plastic box is a kind of packaging box made of PP material. It has smooth PP plastic box, frosted PP plastic box, transparent PP plastic box and real white PP plastic box.
There are three kinds of environmentally friendly plastic boxes, common material characteristics: PP - the most economical and environmentally friendly, can use ultrasonic or glue bonding technology. PET- is an environmentally friendly material, with high transparency and high transparency. The environmental protection box made of PET and PP is widely used in the United States, Europe, and Japan. They can be used in offset printing, silk screen printing, 3D, hot stamping, or a combination thereof.
How to distinguish, pet, pvc, pp materials:
1: The general PVC material is more brittle, the PET material is tougher, and the PET material can be directly UV, while the PVC and OPP film are not acceptable.
2: When the PVC is burned, it will be black. If the PET burns, it will not be black and will melt.
3: The transparency of PVC is not as good as that of PET. When the PVC is damaged, the crease will be white. PET does not, but is much more brittle than PVC.
4:
Name Burning condition Burning flame condition After the fire, the smell
PP is easy to melt and drip, yellow and blue, less smoke, continue to burn, oily
PVC is difficult to soften, yellow on the green, smoke off the fire, irritating sour
PET is easy to soften and foam, orange, a small amount of black smoke is slowly extinguished from the fire.