Laminating process of large vacuum laminator

2022-03-09 16:03

The lamination principle of multi-layer board is that PP (polyamine resin) is cured by heat and the copper foils on both sides are bonded together to form PP inner core PP copper foil for laminated board. This is the lamination structure of four-layer board. If it is a six-layer board, first press the four-layer inner layer of l2 l3 l4 l5. In the middle is the core board, and then two layers of PP sheet are attached up and down. PP sheet thickness are required. As long as the results can achieve the customer requirements of the plate thickness. Paste good PP sheet and copper foil. Put on other layers of copper foil and PP. Simply press it first. After high temperature pressing. PP melts naturally at high temperatures. The multi-layer board will be pressed together. There will be PP water in the process of pressing. During cam treatment, the glue opening can be opened when copper is laid.

vacuum laminating machine laminating process:

1. The typical method of the traditional method is to use 5-25PSI stabilized pressure to soften the flowable glue to gradually drive away the bubbles in the plate book during the period of temperature rise (about 8 minutes), after 8 minutes, the viscosity of the glue has gradually increased, so the pressure should be increased to 250PSI full pressure to squeeze out the bubbles closest to the edge and continue to harden the resin at high temperature and high pressure of 170 ℃ for 45 minutes, then keep the original pressure at the original bed mouth and cool down for about 15 minutes for stabilization treatment, and bake in an oven at 140 ℃ for 3-4 hours after the board gets out of bed to further harden.

2. The change of resin After the increase of the four-layer board, the multi-layer lamination has changed greatly. In order to conform to the situation, the formula of epoxy resin and the treatment of film are also changed. The biggest change of FR-4 epoxy resin is to increase the composition of accelerator in its Verliwater and add phenolic resin or other resins, so that the molecular weight of B- Satge epoxy resin soaked and dried on glass cloth is slightly increased, and the training handout PAGE4 OF 6 on pressing process has side bonds and has larger density and viscosity, in addition, the reactivity of this B- Satge to the C- Satge is reduced, so that the flow rate at high temperature and high pressure is reduced, and the conversion time can be increased. Therefore, it is suitable for the production mode of stacking high and large plate surfaces by a large number of pressing plates and switching to higher pressure. Moreover, the four-layer plate after the pressing plate is completed also has better strength than traditional epoxy resin, such as dimensional stability, chemical resistance and solvent resistance.

3. At present, a large number of pressing plate methods are large-scale equipment for cold and hot bed separation, with as few as four openings and as many as 16 openings. Almost all of them are heat in and heat out. After 100-120min of thermal hardening, they are quickly pushed to the cold bed at the same time. Under high pressure, the cold pressure is stable for about 30-50min, thus completing the whole pressing process.

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