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  • Metal substrate plug hole technology

         With the rapid development of electronic products to light, thin, small, high-density, multi-functional and microelectronic integration technology, the volume of electronic components and printed circuit boards is also shrinking exponentially, and the assembly density is increasing.In order to adapt to this development trend, the predecessors developed the PCB plug technology, which effectively increased the PCB assembly density, reduced the product volume, improved the stability and reliability of special PCB products, and promoted the development of PCB products.

    There are mainly three kinds of metal base plug hole technology: semi-solidified sheet pressing hole; Screen printing machine plug hole; Vacuum plug hole.

    1.semi-solidified sheet pressing hole

    It’s use a semi-curing sheet with high content of glue.

    By means of vacuum hot pressing, the resin in the semi-curing sheet is filled into the hole that needs plug, while the position that does not need plug hole is protected by the protection material.After pressing, tear off the protective material, cut off the overflow glue, that is to get the plug hole plate finished product.

    1). required materials and equipment materials: semi-cured sheet with high glue content, protective materials (aluminum foil, copper foil, release film, etc.), copper foil, release film

    2). Equipment: CNC drilling machine, metal substrate surface treatment line, riveting machine, vacuum hot press, belt grinding machine.

    3). technological process: metal substrate, protective material cutting → metal substrate, protective material drilling → metal substrate surface treatment → rivet → laminate → vacuum hot press → tear protective material → cut excessive glue  

     2.Screen printing machine plug hole

    refers to the ordinary screen printing machine plug hole resin into the hole in the metal substrate, and then curing.After curing, cut off the overflow glue, that is, the plug hole plate finished products.Since the diameter of the metal base plug hole plate is relatively large (diameter of 1.5mm or more), the resin will be lost during the plug hole or baking process, so it is necessary to stick a layer of high temperature protective film on the back side to support the resin, and drill a number of air vents at the orifice location to facilitate the vent of the plug hole.

    1) .  required materials and equipment materials: plug resin, high temperature protective film, air cushion plate.

    2) equipment: CNC drilling machine, metal substrate surface treatment line, screen printing machine, hot air oven, belt grinding machine.

    3) technological process: metal substrate, aluminum sheet cutting → metal substrate, aluminum sheet drilling → metal substrate surface treatment → stick high temperature protective film → drill air cushion plate drilling → screen printing machine plug hole → bake curing → tear high temperature protective film → cut excessive glue.

    3.Vacuum plug hole

    refers to the use of vacuum plug hole machine in a vacuum environment plug hole resin into the hole in the metal substrate, and then bake curing.After curing, cut off the overflow glue, that is, the plug hole plate finished products.Due to the relatively large diameter of the metal base plug hole plate (diameter of 1.5mm or more), the resin will be lost during the plug hole or baking process, so a layer of high temperature protective film should be pasted on the back side to support the resin..

    1). required materials and equipment materials: plug resin, high temperature protective film.

    2). equipment: CNC drill, metal substrate surface treatment line, vacuum plug machine, hot air oven, belt grinder.

    3).Technological process: metal substrate opening → metal substrate, aluminum sheet drilling → metal substrate surface treatment → paste high temperature protective film → vacuum plug machine plug hole → baking and curing → tear high temperature protective film → cut excessive glue.

    Metal substrate main plug hole technology half a curing film pressure filling holes, silk-screen printing machine plug hole plug hole and vacuum machine, each plug hole technology has its advantages and disadvantages, should be in accordance with the requirements of product design, cost requirements, equipment types, such as a comprehensive screening, which can increase the production efficiency, improve product quality, reduce production cost.