Sanqing Machinery Manufacturing Co., Ltd. has independently developed and produced equipment for nearly 20 years. It has solved various problems in the production process for customers and has accumulated a lot of valuable experience. Many users have different degrees of color difference during the production process, resulting in unqualified products. , Resulting in a lot of waste, the following is to share the reasons and solutions for color differences in the production process.
1. The problem of blow molding machine parts. Blow molding machine barrel screw has damage gaps after long-term use, and there are dead corners of materials at the gaps. During the production process, the previous batch of different colors of raw materials slipped, resulting in uninterrupted color differences in the finished product. In this way, it is necessary to check the size of the damage problem and whether to choose to repair or replace the screw. The screws used by Sanqing Plastic Machinery are all barrel screws of well-known domestic brands. Each batch of barrel screws requires quality inspection by the national authority. Report and strict factory qualification report, and after intensive experiments in the factory, can be installed on the machine to ensure the wear resistance of the barrel screw.
2. The problem of raw materials and color masterbatch
Controlling raw materials is the key to solving color difference. If you use brand-new materials in full to control the parameter temperature, the color difference of the finished product caused by the raw materials is basically very small. If the returned material is added, the finished product will appear due to the color value of the returned material and the uneven mixing during the mixing process of the added quantity. Chromatic aberration problem. If you add recycled materials in production, you must adjust the addition ratio and mixing time according to the performance of the recycled materials to ensure uniform raw materials and reduce the color difference of the finished product. When using color masterbatches, strengthen the inspection of raw materials storage; in the production, the same product should be produced from the same manufacturer, the same brand masterbatch, and color masterbatches. If you need to change the color masterbatch manufacturer, do a small sample test and start mass production only after meeting the standard. Sanqing Plastic Machinery has a complete after-sales service team. Before all equipment leaves the factory, the test machine is strengthened according to customer requirements, and the customer site is simulated, and the raw materials and color masterbatches are matched, and qualified sample bottles are blown. They can be shipped after customer acceptance. And arrange for regional after-sales technicians to go to the customer to install, debug and train until the customer fully grasps it, and promises to maintain the equipment for life, so that the customer has no worries about buying the machine.
3. The problem of uneven mixing of raw materials and masterbatch
Poor mixing of raw materials and masterbatch will also change the color of the product. After the raw materials and the color masterbatch are evenly stirred, when they are fed into the hopper through the lower suction material, the color masterbatch is separated from the masterbatch due to the effect of static electricity and is easily adsorbed on the hopper wall, which will inevitably cause the change of the color masterbatch amount during the blow molding cycle, resulting in color difference . The most effective way is to use a hot air dryer instead of a suction machine to prevent the color difference caused by the separation of the toner and the master batch by manual feeding.
4. The problem of color difference caused by barrel temperature
In order to reduce costs, some non-standard plastic machine manufacturers use inferior heating coils. In the production, it is often encountered that one of the heating coils is damaged or fails, or the heating control part is out of control and the temperature of the barrel changes drastically, resulting in color difference. Generally, the damage and failure of the heating ring will produce chromatic aberration and it will be accompanied by uneven plasticization. The out-of-control and long-burning of the heating control part is often accompanied by product air spots, severe discoloration and even coking. Therefore, it is necessary to check the heating part frequently during production, and replace and repair it in time when the heating part is found to be damaged or out of control to reduce the chance of such color difference. At the same time, when choosing a blow molding machine, you should choose a large brand and cooperate with a manufacturer with a complete after-sales team.
5. Problems when adjusting the production process
When adjusting the blow molding process parameters in the production process, do not change the blow molding temperature, back pressure, blow molding cycle, and the amount of masterbatch added as much as possible. At the same time, the adjustment also needs to observe the effect of the process parameter changes on the color. Professional after-sales training is indispensable, and Do not adjust the production process under the guidance of the experience of non-professionals.
6. The quality and craftsmanship of the blow molding machine head
The head of Sanqing plastic press adopts high-quality 38CrMoAL, heat treatment and tempering adopt extremely strict high standards, long nitriding time, treatment thickness and hardness are the highest standards in the industry, and the runner surface is polished to meet the mirror surface requirements. The mold core adopts high-standard electroplating technology to ensure the quality and color difference of the material strip, and perfectly present the blow molded product.
Hebei Sanqing Machinery Manufacture Co., Ltd.
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