WAYS FOR COLOR PLASTIC MOULDING - Color masterbatch

 

Essentially There Are Four Ways Color is Prepared for Molding

I. Compounded Colors 

The first is called “compounded colors” or sometimes “pre-mixed”. Compounded colors are made by the Thermoforming or thermosetting plastic material used for injection molding." data-mce-style="box-sizing: border-box; margin: 0px; padding: 0px; border-top: 0px; border-right: 0px; border-bottom: 1px dotted #000000 !important; border-left: 0px; border-image: initial; outline: 0px; font-size: 14px; text-size-adjust: 100%; vertical-align: baseline; background: 0px 0px; text-decoration: none !important; color: #000000 !important;">resin supplier, where Coloring agent used in plastics, paints, and other raw materials." data-mce-style="box-sizing: border-box; margin: 0px; padding: 0px; border-top: 0px; border-right: 0px; border-bottom: 1px dotted #000000 !important; border-left: 0px; border-image: initial; outline: 0px; font-size: 14px; text-size-adjust: 100%; vertical-align: baseline; background: 0px 0px; text-decoration: none !important; color: #000000 !important;">pigment and raw material have already been blended together to produce colored plastic pellets that are now ready to Molten thermoplastic or thermoforming resin forced into a mold cavity under pressure." data-mce-style="box-sizing: border-box; margin: 0px; padding: 0px; border-top: 0px; border-right: 0px; border-bottom: 1px dotted #000000 !important; border-left: 0px; border-image: initial; outline: 0px; font-size: 14px; text-size-adjust: 100%; vertical-align: baseline; background: 0px 0px; text-decoration: none !important; color: #000000 !important;">injection mold as-is. For well-known Pantone® or RAL colors this is probably the cheapest and easiest way to go. Manufacturers can obtain common colors quickly and may even have your color in stock. If you want a custom color, this too can be compounded by a resin supplier. 

Kết quả hình ảnh cho compounded color plastic

II. Masterbatching - Color masterbatch 

Masterbatch plastic pellets - color masterbatch 

Masterbatch color are made by masterbatch manufacturer. A masterbatch can be bought in standard or custom colors but these plastic pellets are heavily pigmented, 20% - 50% color with around 50% resin. They are not ready to injection mold as-is; rather, they must be mixed with uncolored plastic to achieve a ratio of 2% color by volume. With a minimum order of one ton, this masterbatch now represents 20 tons of moldable plastic, thus if you are a producer with big quantity of plastic products, color masterbatch is a good way for you to apply to color plastic. Color masterbatch includes many benefits for the processing phase due to some special additives added in it. Masterbatch manufacturer also can supply customer with customs color masterbatch, following the pantone or the customs requirement by mixing color shade. 

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What if you only want a few thousand parts to start out with and you’ve got a custom color? 

First, the client and the compounder must agree on the color to be used to get a near match to the sample. And “near” is the operative term here. Getting an approximate visual match with your color sample is the best that can be done, even when using standard visual and testing conditions. You can then opt to have a small batch of plastic pre-mixed by the molder, using one of two additional methods.

III. Solvent Coloring

Here a pigmented oil is mixed with a solvent. This solvent is sprayed over uncolored pellets, thoroughly coating them just prior to injection. In this method, it’s difficult to precisely control the ratio of color to plastic.

IV. Dry Pigment Mixing

The last method is similar, but uses dry pigment powder directly mixed with plastic pellets in a Drum or cylinder into which is loaded plastic pellets for injection molding." data-mce-style="box-sizing: border-box; margin: 0px; padding: 0px; border-top: 0px; border-right: 0px; border-bottom: 1px dotted #000000 !important; border-left: 0px; border-image: initial; outline: 0px; font-size: 14px; text-size-adjust: 100%; vertical-align: baseline; background: 0px 0px; text-decoration: none !important; color: #000000 !important;">hopper, again with a ratio of 2% pigment by volume. For some engineering plastics, the pellets must be dried first before adding the pigment. This mixing in the hopper is also an approximation – most of the dry pigment will stick to the plastic pellets (which is what you want) but some will also stick to the walls of the hopper and related plumbing, thereby diluting the concentration of color. Any water vapor in the atmosphere will also enter into the mixture the moment that it’s taken from the Heated chamber used to remove excessive moisture from plastic pellets of raw material before injection molding." data-mce-style="box-sizing: border-box; margin: 0px; padding: 0px; border-top: 0px; border-right: 0px; border-bottom: 1px dotted #000000 !important; border-left: 0px; border-image: initial; outline: 0px; font-size: 14px; text-size-adjust: 100%; vertical-align: baseline; background: 0px 0px; text-decoration: none !important; color: #000000 !important;">dryer. All told, this method is expedient if there is a small volume of a custom color – too small to have it compounded for you. But the price of expediency is that there are too many variables to provide assurance you’ll get exactly the color you want.

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*Find the exact color: Technician inspecting a lighthouse lens

 

When dealing with prototypes or low-volume manufacturing, any reputable manufacturing partner will make their best effort to provide the closest match possible using the least amount of raw material. But knowing the above will help you to understand the limitations to the process, especially when it comes to custom colors. Large volumes of parts require lots of plastic and this is the easiest way to guarantee color consistency. Smaller volumes require compromises when it comes to custom colors that can’t always be avoided.

Source: Star Rapid

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For more information please contact:
SUNRISE COLOURS VIETNAM CO., LTD
Add: Office: No. 208 Tam Trinh Street, Yen So Ward, Hoang Mai District, Hanoi City

Phone: 0084 243 645 2586     Fax: 0084 243 645 2586

Moblie/What'sapp/Wechat: +84 385 295 177

Email: rosie@sunrisecolour.com

Website: http://sunrisecolour.com

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