The experience of connecting holographic hot stamping

(1) Holographic stamping is generally combined with embossing. Indentation, die-cutting use, the process is more complex; where the registration has hot stamping patterns and holographic pattern register, hot stamping patterns, holographic patterns and printing patterns register. Registration is achieved by the bronzing roller driving motor, the electro-aluminum foil traction motor, the stepping rod driving motor and the photoelectric eye transmitting the collected signals to the register control panel. The photoelectric eye is limited by the minimum rotation speed. Only when the axis of the photoelectric eye installed on the printing press is higher than a certain rotation speed (that is, the line speed is higher than a certain value), the photoelectric eye can start to work, and the overlay cursor can be displayed on the control panel touch screen. This means that only the hotline speed is higher than a certain value, the qualified product can be stamped and the minimum hot stamping speed is limited.

(2) In connection with hot stamping, the fastest hot stamping speed at present is only around 110m/min. The three factors of hot stamping temperature, pressure and time refer to the transfer time of the electro-aluminum, and if the speed is too fast, it is electrified. Aluminum does not transfer well to the hot stamped paper, causing hot stamping waste. The gravure printing machine speed should be more than 200m/min, so the connection hot stamping speed should be a common problem, if you want to increase the speed, you should use high-performance aluminum. At the same time, it is necessary to improve the accuracy of the parts of the stamping unit and the reliability of the control part.

(3) The problem of changing the aluminum foil. Because the length of anodized aluminum and the length of the paper roll cannot be exactly the same, the length of the aluminum foil is usually shorter than the length of the paper roll. After the aluminum foil has been discharged, the aluminum foil has to be shut down and replaced by the aluminum foil and then restarted to carry out the calibration. , This increases the scrap rate. Since holographic hot stamping involves a second registration during roll change, at present, only the length of the electroformed aluminum is consistent with the roll length. For non-holographic hot stamping, this situation is slightly better.

(4) The holographic hot stamping roller generally adopts a break-off type structure, that is, the hot stamping pattern is made on the hot stamping ring, and the hot stamping ring is connected with the stamping roller through an appropriate clearance fit, positioning pin and bolt. The advantage of this kind of structure is that the hot stamping pattern can be changed flexibly and conveniently. The disadvantage is that the hot oil temperature required for hot stamping is relatively high, generally around 240°C.

Gas-assisted injection molding system

The gas-assisted injection molding system directly injects nitrogen through a staged pressure control system into a plasticized plastic within a cavity of a human mold, so that the internal expansion of the plastic component forms a hollow, but the surface of the product remains intact. In recent years, gas assisted injection molding system technology has developed rapidly. At present, this technology has been applied to the production of many plastic parts, such as various packaging products and television sets or audio and other household appliances, automotive plastic products.

Compared with ordinary injection molding, gas-assisted injection molding has many unparalleled advantages:

(1) In the case that the parts can meet the same requirements for use, gas-assisted injection molding can greatly save plastic raw materials, and its saving rate can be as high as 50%;

(2) It can greatly shorten the forming time of the parts. On the one hand, the reduction in the amount of plastic raw materials brings about a reduction in the time of each cycle of the entire molding cycle; on the other hand, the introduction of high-pressure gas inside the parts has greatly improved the shrinkage deformation of the parts, so the injection pressure holding time, Injection pressure can be greatly reduced pressure; (3) reduce the injection machine injection system and clamping system work pressure, and accordingly reduce the energy consumption in the production and prolong the life of the injection machine and mold.

Beijing Nanfeng Precision Die Cutting Machinery Manufacturing Co., Ltd. Tian Jianlin BR>
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