Jiangmen clothing accessories drop plastic button
Jiangmen garment accessories drop plastic button is widely used, good drip plastic not only depends on the quality of glue. For the method of pressure time syringe, many factors related to the machine affect the droppability and the formation of glue spots. The inner diameter of the needle nozzle is the key to the formation of glue spots, which must be much smaller than the diameter of glue spots on the board. As a principle, the ratio should be 2:1. 0.4 mm ID is required for 0.7 ~ 0.9 mm glue points, and 0.3 mm ID is required for 0.5 ~ 0.6 mm glue points. Equipment manufacturers usually provide technical specifications and operating guidelines to produce the desired size and shape of the glue dots.
The temperature will affect the viscosity and the shape of the glue spots.
Most modern drop molding machines rely on the temperature control device on the nozzle or the chamber to keep the temperature of the glue higher than the room temperature. However, the glue dot contour may be damaged. If the PCB temperature is increased from the previous process, the viscosity and dot shape will be affected
PCB to needle nozzle spacing, or the height of the stopper, control the height of the glue point. It must be suitable for the amount of plastic drop and nozzle ID. For a given amount of glue, the ratio of glue dot height to width will increase with the height of stopper. Generally, the height to the large stop is half of the needle tip ID; beyond this point, discontinuous dripping and pulling will occur.
The application pressure of high-speed equipment can start the dripping cycle regularly before the needle nozzle is in place. The withdrawal speed, withdrawal height and the time delay between injection molding and needle withdrawal all affect the shape of glue spot and the pulling line.
Source: Jiangmen clothing accessorieshttp://www.ruihongbutton.com
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