The use of color masterbatch is very simple, it only needs to be mixed with resin particles according to the specified ratio and mixed by hand.
In the operation of the equipment should pay attention to the following issues:
1. The mixing cavity of the injection molding machine or extruder generally has multiple temperature zones, and the temperature near the blanking port should be slightly higher. This is to make the color masterbatch melt quickly after entering the mixing cavity, and the plastic resin should be melted as soon as possible. Mix evenly, which is conducive to the good dispersion of the color masterbatch in the product.
2. Appropriately apply back pressure to the injection molding machine, which can improve the mixing effect of the screw and facilitate the dispersion of pigments. The side effect of applying back pressure is to slow down the injection molding speed.
3. Properly increasing the die temperature of the extruder can increase the brightness of the product.
The basis for determining the proportion of color masterbatch is to obtain a satisfactory coloring effect. As long as the surface tone of the product is uniform and there are no streaks and spots, it can be recognized. The proportion of color masterbatch can be selected as follows:
1:100 Unless the kneading property of the equipment is very good, it is easy to cause uneven pigment dispersion. Generally, it is not recommended for customers to use this ratio.
However, due to price pressure, some customers especially want to use this proportion of color masterbatch. For the sake of customers, they also produce more concentrated color masterbatch with such a low proportion, and the dispersibility of the pigment can generally meet the requirements.
1:50 is used for plastic products with general coloring requirements, and PE and PP color masterbatches are mostly used in this ratio.
1:33–1:25 is used for PO products with higher coloring requirements, lower coloring requirements or general ABS products
1:20 is used for advanced plastic products, including PO, ABS, and can be widely used in injection molding, blow molding, spinning and other processes
1:20 or more is generally used for coloring of advanced cosmetic containers, mostly used in small injection molding machines
When calculating the cost of coloring the masterbatch, the weight of the masterbatch itself should be deducted.
An example is as follows: 2 kg of color masterbatch is added to 100 kg of plastic resin. At this time, the total weight is already 102 kg. Assuming that the resin price is 10 $/kg, and the color masterbatch price is 20 $/kg,
Then the increased cost due to the use of color masterbatch in 102 kg of plastic products is:
2 kg × (20 $/kg – 10 $/kg) = 20 $
Converted to the increased cost of using color masterbatch per 100 kilograms of plastic products:
20 $ / 102 kg × 100 kg = 19.61 $
In most cases this is the case. However, in some cases, coloring with masterbatch is more economical than coloring with toner, because colorists can achieve the coloring effect of higher-priced pigments by combining several lower-priced pigments.
Also consider the following two phenomena:
- In many cases, the pigments used by plastic product manufacturers when using toner for color matching are not the most economical, and due to the lack of familiarity with pigments, repeated experiments in color matching lead to waste of manpower and materials. This problem does not exist with the use of color masterbatches.
- The grades of products colored with color masterbatch are completely different from those colored with toner powder, and their price is also higher. The higher selling price is often higher than the increased cost of using color masterbatch. Instead, mothers can create “profits”. From this point of view, in some cases, coloring with masterbatch is more “economical” than coloring with toner.
Generally, the color masterbatch does not need to be dried and can be used directly. However, except for ABS and NY color masterbatch, they should be dried according to the conventional process.
How long is the shelf life of the masterbatch?
The masterbatch can be stored for a long time.
The pigments in the masterbatch are dispersed and fixed in the carrier resin, in a closed state, and their quality will not change even if they are stored for a long time. but should be stored in a dry, cool environment.
Generally, companies often use several masterbatches to formulate specific colors for small-volume customers. However, without the guidance of the company’s technical personnel, the customer can not use several color masterbatches on their own, let alone mix the color masterbatches produced by different companies, so as to avoid losses caused by incompatibility.
Some pigments have an impact on the flame retardant effect of the product. When used in flame retardant products, it should be pointed out to the color masterbatch manufacturer.
In order to fully display the coloring effect of the masterbatch, the mold must have the corresponding quality, especially the surface must be very smooth.
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Classification by carrier: such as PE masterbatch, PP masterbatch, ABS masterbatch, PVC masterbatch, EVA masterbatch, etc.
Classification by use: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc. Each species can be divided into different grades, such as:
- Advanced injection masterbatch
Used in cosmetic packaging boxes, toys, electrical enclosures and other advanced products.
- Ordinary injection masterbatch
For general daily plastic products, industrial containers, etc.
- Advanced blown film masterbatch
For blow molding coloring of ultra-thin products.
- Ordinary blown film masterbatch
It is used for blow molding coloring of general packaging bags and woven bags.
- Spinning masterbatch
It is used for spinning and coloring of textile fibers. The color masterbatch has fine particles, high concentration, strong coloring strength, and good heat resistance and light resistance.
- Low-grade masterbatch
It is used to manufacture low-grade products that do not require high color quality, such as trash cans, low-grade containers, etc.