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. 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. Top laminate with white melamine paper phenolic resin.

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


    Backup material feature

    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 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. in line with ROHS standards.
    5. Thickness tolerance of melamine wood board controlled within (+0.15mm). to avoid frequent change 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.

    PCB Drill back up board Storage conditions:

    1. back up board should stacked to prevent physical deformation.
    2. The uppacked drill board should 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 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. the quality will not degraded after one year of storage.

    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.LCOA .holder suppliers


    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.
    melamine board.  wood fiber.  white melamine.  wooden backup.  yueshan backup.  quality pcb.  wood backup.  high quality.  bit life. 

  • 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

    circuit board drilling

    A circuit board drill is much like a common drill. except it optimized for drilling holes in a circuit board. as opposed to drilling holes in construction materials such as metal. and wood. Unlike other drills. which made from steel, a circuit board drill is almost always made from tungsten. because of its mechanical properties. The size of this type of drill can vary , but it is very small. This drill sometimes used, but it more. often combined with a drill press for automated drilling. Circuit boards sometimes need holes for installing parts. or making it easier for the boards to fit into certain systems.
    Tungsten is a very hard metal, which is why it used to make circuit board drill bits. When a hole has to drilled through a circuit board, the bit must go through copper traces, which are sturdy and hard. If steel used, then it would rip the copper and tracing, and the steel itself would wear . Tungsten is harder and can better handle higher speeds. so it can go through the traces without ripping them and will not wear as .
    The reason for using a circuit board drill is to drill holes. through the circuit board, but these holes serve different purposes. Some parts cannot installed on the circuit board without drilling holes for the parts to fit in. this can also increase the staying power of these parts, as they are able to hold onto more of the board. Not only that, but some systems may force users to place holes in the board so it can installed.

    Drilling PCB burrs

          Drilling burr in PCB production is indispensable process. and it can't 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 much. 

          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 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.

    entry board. entry level. certification exam. application process. level boards. simply put. price low. price high. january 31. 

  • 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 FAQ

    pcb drill press

     An accurate drill press is an essential tool for making your own . through-hole printed circuit boards at home.
    The solution that we arrived at was to use a Harbor-Freight Pneumatic 1/8" Micro Die Grinder. and attach it in-plane with a precision linear slide rail. The Micro Die Grinder runs at 56,000 RPM and has the 1/8" collet that I needed for the PCB drill-bits.
    The keep the die-grinder in-plane with the rail. we decided to mount the linear rail to a self-centering drill-press jig.
    Build the Drill Mount and Attach It to the Slide
    We removed the excess sides of the self-centering drill press jig. and sanded all the rough edges smooth. The THK rail mounts along the center. We used the measurement between the holes to drill through the drill mount.

    how to drill a hole 

          In pcb design, the hole is consist of two parts. one is the drill hole in the center area, the other is the pad around the drill hole. The size of these two parts determine the hole size.  in the design of a printed circuit board with high speed and high density. the designers always hope that the holes the smaller the better. so that it can leave more space for circuit layout. But the hole size decrease will bring the increase of the pcb fabrication cost, moreover.  the hole size is impossible to decrease. because it's limited by the process of drilling and plating. The smaller hole size, the longer drill time required, and the easier off center position. When the depth of hole is more than 6 times of hole diameter. the copper plating process won't guarantee. that the hole wall could plate copper . For example, a standard 6 layer PCB with thickness (depth of the hole) about 50 mil, so the PCB manufacturer. can provide the minimum hole diameter to 8 mil.
          Now we drill the holes for leaded components and the via holes that link the copper layers together.  First we use an X-ray drill to locate  targets in the copper of the inner layers.  The machine drills registration holes to ensure. that we will drill through the centre of the inner layer pads.
           To set up the drill the operator first puts a panel of exit material on the drill bed.  This stops the drill tearing the copper foil as it comes through the PCB.  Then he loads one or more PCB panels, and a sheet of aluminium entry foil.
           The drilling machine is computer-controlled. The operator selects the right drill program.  This tells the machine which drill to use and the X Y co-ordinates of the holes.  Our drills use air-driven spindles which can rotate up to 150,000 revolutions per minute.  High speed drilling ensures clean hole walls to provide a secure base for good plating on the hole walls.
          Drilling is a slow process as each hole must drilled .  So depending on the drill size we drill a stack of one to three PCB panels together.  We can drill holes down to 100 microns in diameter.  To give you an idea of the size, the diameter of a human hair is about 150 microns.  Drill change is automatic.  The machine selects the drill to use from the drill rack, checks that it is the correct size. and then loads it into the drill head.
           Once all the holes drilled the operator unloads the panels from the drilling machine.  and discards the entry and exit material.

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