pcb drilling Entry backup board for micro sizes hole process

  • Composition

    Drill PCB backup board composition

    circuit board drill entry and backup board ,as a pcb board material ,commonly used for the micro size hole PCB drilling process with high grade and precise grade,Base material with HDF board ( high density wood fiber board )of pine tree,willow tree, eucalyptus tree and poplar tree etc.Top laminate with white melamine paper phenolic resin.

    the inner layers of this backup material: high density fibre board ,normally available two density option as 830kg/m3 and 880kg/m3.

    Backup material feature

    TAGS: xray drill. laser drilling. pcb assembly. pcb fabrication. copper foil. . aspect ratio. inner layer. copper layers. pcb design.copper clad. layer pads. aluminium entry. entry foil. laser drills. leaded components. dc motor. electronic components. laser beam. .
    1. Circuit board drill backup board Have a certain surface hardness (reach to 80+-2 shore)to ensure that the machine drills bit removal chip  to keep the drill holes wall clear and reduce the drilling burr, but not too hard and wear the drill bit to protect the pcb driller. it's designed to replace phonlic sheets (surface hardness as 85 shore)
    2. drilling printed base material is made of wood fibre, which has no resin composition, and this drill bed does not produce the melting resin ball adhering to the holes wall when high speed mechanical drilling.
    3. this printed circuit exit material has certain heat conduction function, which takes away the  heat generated during board drilling, reduces the high temperature of the drill bit during speed drilling, and prevents annealing of the drill bit.
    4. Ideal exit material for high precision pcb manufacturing ,Material uniformity, less impurities, no metal impurities, fully in line with ROHS standards.
    5. Thickness tolerance of melamine wood board is controlled within (+0.15mm) to avoid frequent adjustment of drilling machine bit height during pcb panels drilling.
    6. pcb hole size can within 0.3mm.The performances of drilling holes are higher than those of non-professional rotary perforated wood fiberboard, medium density PN wood fiberboard, high density PS wood fiberboard and resin wood fiberboard, which are close to phenolic pcb board. drill size. drill diameter can less than 0.3mm

    7.pcb board custom service  such as drills registration holes,cut to size also provide for back drill pcb.


  • Description

    Circuit board drilling backup board for high precision PCB drill

    Thickness 2.7mm,2.5mm, 2.0mm,
    Thickness Tolerance ±0.15(WM27 WM25),±0.10 (WM20)
    Surface Hardness 80±3 degree(shore D)
    Usual Sizes 37"×49",41"×49",43"×49"
    Special Sizes Cut to sizes on customers’ requests
    Size Tolerance ±2mm
    Destiny 980±30kg/m3
    Flexural Strength ≤0.6% of diagonal length
    Fabrication Suitability Sawing or drilling
    Strength against Bending ≥55N/mm2
    Surface Roughness smooth
    Water Content 5.5%~7.0%
    Expansion Rate after Moisture Absorption (24h) ≤35%
    Formaldehyde Release ≤30mg/100g
    Package 250pcs/pallet
    Storage Full package, keep even, room temperature, put in ventilated place, caution against water, damp, keep away from fire and hot things
    Period of Validity Store as the terms given above,six months from shipping date

    PCB Drill back up board Storage conditions:

    1. back up board should be stacked smoothly to prevent physical deformation.
    2. The uppacked drill board should be used as soon as possible to avoid long-term exposure to the air, resulting in changes in moisture content leading to hole board surface deformation.
    3. Storage environment is ventilated and dry indoor environment. Otherwise, in rainy season, it is easy to cause mould on the edge of the board.
    4. When the original packaging is not destroyed and stored properly, the quality will not be degraded after one year of storage.

  • Product Advantage

    Circuit board drill entry and backup board Advantages:

    1. It is a composite of the Melamine paper and wooden fiber board with high density. It is especially made to replace the Phenolic backing board
    2. It is difficult to distort.  The warping degree is smaller than the same size of Phenolic board.
    3. It reduces the abrasion of the drill and lengthens the life of micro drill bits. 
    4. It can save the cost and it has more sizes. 
    5. It doesn’t pollute the environment.

    Drilling PCB burrs

          Drilling burr in PCB production is indispensable process and it can't be avoided for either electro-connection among layers or fixing elements. 
          The formation of pcb drilling burrs affects the PCB quality and ends up in deburring processes. The burrs created from drilling processes is onerous to get rid of and also the price of deburring is often substantial. 
          step-down of burr occurred in drilling method will scale back effort and time to get rid of burr. so the opening drilling and deburr method square measure thought-about as necessary processes to save lots of energy. 
          Since burr formation is powerfully associated with method conditions and drill pure mathematics, experiments were dole out to develop a Drilling Burr management Chart by variable feed, spindle speed and drill diameter and backup board material. 
           it tested that choose high density and hardness backup board may be a sensible approaches to attenuate drilling burrs and to green the PCB drilling method.

    PCB drilling performance

    PCB drilling performance of different types Backup board
    Based on our clients experimental results. and different pad characteristics analysis.
    hole wall roughness ≤ 30μm. hole position offset ≤ 75μm. hole position accuracy CPK ≥ 1.33, and the nail head is less than twice the inner layer copper thickness.I drill wear, drill broken. and burr.

     for the pcb hole size 0.15mm hole . the drilling performance of the  backup board  :phenolic paper pad.  > hot pressing melamine backup board >.  fast pressing type melamine wood board > Cold-laid melamine wood mat.  > phenolic wood mat ≈ UV plain board > high-density wood-fiber board.

    it's proved that  as the hardness and density of the backup board increase. The better the drilling performance.

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