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Process description and factors of bottle cap mould
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2018-10-22

Printing instructions for the cap process

The bottle cap has advanced technology in the printing process, which makes the wine bottle cap beautiful. Now the bottle cap mold factory introduces it. The bottle cap process printing and other printing processes use different pad printing processes to print plastic bottle caps: change the type Bento is easy to make. Less investment. Compared with other printing equipment, the investment in pad printing equipment is less.
Strong compliance. The shape of the pad can be changed at will, which greatly enhances the conformity of the pad printing skills to the shape of the substrate and is suitable for bottle cap printing with different appearances and sizes. And the choice of ink for plastic bottle cap printing is very important. The bottle caps are basically made of PP and PE materials, and the selected ink must match the type of printing material. Then when selecting and using inks, you should pay attention to the fact that some inks have added a hardener to improve the adhesion effect, but it increases the difficulty of operation. Therefore, unless the customer specifically asks, it is not recommended to use this method. Use pad printing inks instead of screen printing inks. Screen printing inks have better leveling properties, while pad printing inks have better colloidal properties; the monotonic speed of screen printing inks is relatively slow, and the monotonic speed of pad printing inks is relatively fast. In order to print beautifully, it is necessary to choose the ink, and there are two key points in the manufacture of bottle caps: plastic head and money plate. Rubber head: At present, the selection of rubber heads is generally not emphasized in China, but the selection of rubber heads should be very strict when printing. In bottle cap printing, the application of round rubber head is more common. Plates: For consumer cap manufacturers who value pad printing quality, resin gravure is a wise choice.

Technological factors of welding mark of plastic bottle cap

The welding mark of the plastic bottle cap is a linear mark on the injection part. When the plastic melt flows in parts or there is more than one gate or the thickness changes when the part has holes and inserts, two strands The stream meet is caused by incomplete fusion at its interface.

Process factors:
(1) The temperature of the material tube or the hot runner is too low, and the plasticization of the melt is not complete. The temperature should be increased or the plasticization time should be appropriately extended.
(2) The wall thickness of the product is too thin, and it is difficult to fill the mold, thereby increasing the melt temperature difference in the mold and prone to welding marks. At this time, the injection pressure or the barrel temperature can be increased appropriately.

(3) The mold temperature is too low, which causes the melt flow rate to slow down and cooling too fast, and the two streams cannot effectively fuse when they meet.

(4) The injection speed is too slow, resulting in a slower flow rate, and the melt in the cavity that enters first cools faster. Material factors: The raw material has moisture, which is converted into gas during the injection process, which affects the fusion effect of the stream. The raw material should be dried and moisture-proofed.
Mould factors:
(1) The mold is trapped, so that the gas in the cavity cannot be exhausted. When the two streams are merged, the fusion effect is affected.
(2) The gate design is unreasonable. The gate position should be avoided as much as possible around the inserts and holes. Gates where spray filling occurs should be managed to correct, migrate, or buffer the stoppers, and try not to use or use fewer gates.


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