TWM495943U - A drilling entry board - Google Patents

Description

Drilling cover

The present invention relates to a drilling cover plate, in particular to a drilling cover plate which can be used in the fields of IC carrier board, PCB, BGA board, etc., which has a simple structure and can form a better hole wall roughness and comparison. The advantage of the resin wound on the less drill bit.

In recent years, electronic products have become light, versatile and high-speed development, which has led to an increase in the number and density of micro-holes in printed circuit boards. Based on this trend, the quality of drilling, the accuracy of hole position and the life of the bur are the same. Important indicators, however, traditional aluminum foil or phenolic resin and other traditional auxiliary plates, has long been unsuitable for this application, if it is barely used, it is easy to break the needle, hole deviation and drilling pin wear and other undesirable defects.

Nowadays, different types of drilled metal cover plates (maximum aluminum cover plates) are formed correspondingly, but they can be stabilized and undoubtedly used by the application, mainly due to the complicated formula of the lubricating layer and the angular pressure under the buffer hole. Lubrication of the drill (reducing the wear of the drill) and the adhesion of the metal foil (drill cooling function) are insufficient. For example, a drilled plate made of a water-soluble lubricating mixture, a synthetic wax and a paper sheet, but there is a problem that the drill pin cannot dissipate heat and viscosity; the polyethylene glycol or polyether ester improves the viscosity problem, but there is The drill needle can not be chipped and the hole is biased; the water-soluble resin mixed with water-insoluble lubricant is used to make the film, the film and the aluminum foil composite, the film and the aluminum foil are coated with the thermosetting resin, and the drilling cover plate has three different combinations. But the formula and production are complex and combined with the heat The solid resin layer is easy to make the drill slip and the hole is broken or broken due to high hardness.

The main object of the present invention is to provide a drilling cover plate which has a simple structure and can form a preferred hole wall roughness and a small resin wound on the drill bit.

In order to achieve the above object, a drilling cover plate provided by the present invention comprises a metal foil and at least one layer of a hydrophilic resin composition layer, wherein the hydrophilic resin composition layer is bonded to the metal foil, and The hydrophilic resin composition layer has a reaction enthalpy of 10 to 40 (J/g) and a melting point of between 48 and 70 °C.

When implemented, the thickness of the metal foil is 0.05 mm to 0.2 mm.

When implemented, the hydrophilic resin composition layer has a thickness of 0.02 mm to 0.15 mm.

When implemented, the hydrophilic resin composition layer comprises a series selected from the group consisting of polypropylene oxide, polyethylene oxide, polybutylene glycol, polyolefin ethylene glycol polyester, carboxymethyl cellulose, and polyethylene. a water-soluble resin having a crystallinity of one of pyrrolidone, polypropylene decylamine and sodium polyacrylate; or a hydrophilic resin composition layer comprising one selected from the group consisting of polyethylene glycol phenol ether and polyethylene glycol alkyl group A water-soluble resin having crystallinity such as an ether ether such as ether; or the hydrophilic resin composition layer comprising a water-soluble resin having crystallinity selected from the group consisting of alcohols such as hexahexol, propylene glycol and glycerin.

When implemented, the water-soluble resin is further mixed with an inorganic compound, an antifoaming agent and a surfactant to form the hydrophilic resin composition layer.

In practice, the inorganic compound is one or more of talc, molybdenum disulfide, zinc molybdate, calcium carbonate, graphite, boron nitride, aluminum nitride, aluminum oxide, and aluminum hydroxide.

When implemented, the antifoaming agent is a modified polysiloxane resin. And related derivatives thereof, Silicone and its fatty acids, fatty acid amines, polyether compounds, and the like.

When implemented, the surfactant is a compound having a hydrophilic part and a lipophilic part in one molecule, wherein the hydrophilic portion has a carbonate, a sulfate, etc., the pro The fatty portion has a linear chain, a side chain or even a cyclic aromatic hydrocarbon group.

When implemented, the hydrophilic resin composition layer is 20 parts by weight of a water-soluble resin having a number average molecular weight of 300,000 to 400,000, and after dissolving in water with 60 parts by weight of a water-soluble resin having a number average molecular weight of 10,000 to 80,000, 8 parts by weight is added. The inorganic compound is stirred and completely dispersed in the aqueous solution of the water-soluble resin, followed by further adding 2 parts by weight of the antifoaming agent and 2 parts by weight of the surfactant, followed by stirring and completely dispersing in the aqueous solution of the water-soluble resin.

When implemented, the hydrophilic resin composition layer is 20 parts by weight of a water-soluble resin having a number average molecular weight of 200,000 to 300,000, and after being dissolved in water with 60 parts by weight of a water-soluble resin having a number average molecular weight of 300,000 to 400,000, 8 parts by weight is added. The inorganic compound is stirred and completely dispersed in the aqueous solution of the water-soluble resin, followed by further adding 2 parts by weight of the antifoaming agent and 2 parts by weight of the surfactant, followed by stirring and completely dispersing in the aqueous solution of the water-soluble resin.

When implemented, a primer layer is disposed between the metal foil and the hydrophilic resin composition layer.

When implemented, the primer layer is either a thermoplastic resin or a thermosetting resin or a mixture of two.

In order to further understand the present invention, the preferred embodiments of the present invention, together with the drawings and figure numbers, detail the specific components of the present creation and the effects achieved thereby.

1‧‧‧metal foil

2‧‧‧Hydrophilic resin composition layer

Fig. 1 is a schematic view showing the structure of a cover plate for drilling according to the present embodiment.

Fig. 2 is a schematic view showing the structure after adding a primer layer to the present embodiment.

Please refer to FIG. 1 , which is an embodiment of a drilling cover plate comprising a metal foil 1 and at least one layer of a hydrophilic resin composition layer 2 .

The metal foil 1 is an aluminum foil and has a thickness of 0.05 mm to 0.2 mm.

The hydrophilic resin composition layer 2 has a thickness of 0.02 mm to 0.15 mm for bonding to the metal foil 1, and the hydrophilic resin composition layer 2 has a reaction enthalpy of 10 to 40 (J/g). And the melting point is between 48~70 °C.

Wherein, the hydrophilic resin composition layer 2 comprises a series selected from the group consisting of polypropylene oxide, polyethylene oxide, polybutylene glycol, polyolefin ethylene glycol polyester, carboxymethyl cellulose, polyethylene. a water-soluble resin having a crystallinity of one of pyrrolidone, polypropylene decylamine and sodium polyacrylate; or a hydrophilic resin composition layer comprising one selected from the group consisting of polyethylene glycol phenol ether and polyethylene glycol alkyl group A water-soluble resin having crystallinity such as an ether ether such as ether; or the hydrophilic resin composition layer comprising a water-soluble resin having crystallinity selected from the group consisting of alcohols such as hexahexol, propylene glycol and glycerin.

The preferred embodiment of the present invention is to further mix the water-soluble resin with an inorganic compound, an antifoaming agent and a surfactant to form the hydrophilic resin composition layer 2. The inorganic compound is one of talc, molybdenum disulfide, zinc molybdate, calcium carbonate, graphite, boron nitride, aluminum nitride, aluminum oxide, aluminum hydroxide or the like. The antifoaming agent is a modified polysiloxane resin and related derivatives thereof, Silicone and its One of a fatty acid, a fatty acid amine, a polyether compound, and the like. The surfactant is a compound in which a hydrophilic part and a lipophilic part coexist in one molecule, wherein the hydrophilic part has a carbonate, a sulfate, etc., the lipophilic part There are linear, side chain or even cyclic aromatic hydrocarbon groups.

Therefore, in actual practice, the metal foil 1 is made of an aluminum foil having a purity of 98 or more, which can alleviate the impact from the edge portion of the drill and improve the adhesion of the tip end portion of the drill blade portion, and the hydrophilic resin composition layer 2 is the number. 20 parts by weight of a water-soluble resin having an average molecular weight of 300,000 to 400,000, and 60 parts by weight of a water-soluble resin having a number average molecular weight of 10,000 to 80,000 are dissolved in water, and then 8 parts by weight of an inorganic compound is added and stirred and completely dispersed in a water-soluble resin aqueous solution. Then, 2 parts by weight of an antifoaming agent and 2 parts by weight of a surfactant are added, followed by stirring and completely dispersing in an aqueous solution of a water-soluble resin. The hydrophilic resin composition layer 2 after drying was formed to have a thickness of 0.03 mm, and the hydrophilic resin composition layer 2 was applied by a two-roller Comma Coater to form a metal foil 1 having a thickness of 0.01 mm on one side, and then dried. The machine is cooled to form the cover for drilling of the present invention (the first embodiment is shown above).

Further, the hydrophilic resin composition layer 2 may be prepared by dissolving 20 parts by weight of a water-soluble resin having a number average molecular weight of 200,000 to 300,000, and 60 parts by weight of a water-soluble resin having a number average molecular weight of 300,000 to 400,000 in water, and then adding 8 The parts by weight of the inorganic compound are stirred and completely dispersed in the aqueous solution of the water-soluble resin, followed by adding 2 parts by weight of the antifoaming agent and 2 parts by weight of the surfactant, stirring and completely dispersing in the aqueous solution of the water-soluble resin. After forming the hydrophilic resin composition layer 2 after drying to a thickness of 0.03 mm, the hydrophilic resin composition layer 2 is applied by a two-roller Comma Coater to form a metal foil 1 having a thickness of 0.01 mm on one side, and then Cooling with a dryer to form the drilled cover for this creation (on the second Example).

Therefore, the cover plate for drilling obtained in the above two embodiments is placed on the copper-clad laminate having a thickness of 0.1 mm, and then the hydrophilic resin composition layer 2 is placed on top of the layer. On the lower side of the copper laminate, the lower backing plate (urea plate) is arranged, with the conditions of 0.105 Φ (0.105mm*2.2mm), rotating speed 200000rpm, feed speed 25mm/sec, and retracting speed 423mm/sec. The drill hole is drilled at 3000hits, and is measured by a thermal differential scanning card gauge at a temperature increase rate of 10 ° C per minute, and the measurement range is 40 to 80 ° C. For the drilling caps of the above embodiments 1 and 2 The actual measurement was carried out in 3 different areas of any choice on the board. The hot enthalpy value was found to be 17 (J/g), the melting point was 60 ° C, and the hole wall roughness test was performed (after drilling the hole for the center of the machined hole) The cross-section is cut and polished, and the distance between the largest convex portion and the deepest concave portion on one side of the hole wall is measured. The measured portion is the average of the processed hole of the 2999 hole of the drill bit as the value of the hole wall roughness. ), hole position accuracy test (using a hole analyzer for overlapping copper foil laminates) The offset of the 3000hits hole in the back of the copper foil laminate is measured with the offset of the specified coordinates. The average value and standard deviation (δ) are calculated for each drill, and the average value +3 δ and the maximum value are calculated. The average value of the drill bit drilling process and the degree of the amount of the resin roll (the maximum diameter of the resin roll attached to the drill hole diameter is observed by an optical microscope with a magnification of 25 times for each of the 3000hits) And the length of the bit axis direction to determine the degree of resin coiling), it can be found that the drilling cover plate provided by the present invention can form a better hole wall roughness and less resin reeling on the drill bit.

Further, as shown in Fig. 2, in order to increase the adhesion between the metal foil and the hydrophilic resin composition layer, it is preferable to form a primer layer having a thickness of 0.001 to 0.01 mm on the metal foil in advance. The primer layer may be any one that can improve the adhesion of the resin composition. Any limitation, it is also possible to use any one or a mixture of thermoplastic or thermosetting resins, such as a vinyl acetate polymer, a polyester polymer, an acryl-based polymer, or the like. Mixtures, thermosetting resins such as epoxy-based resins and cyanate series resins.

Therefore, the aluminum cover plate for drilling the present invention has a specific range of enthalpy and melting point values through the hydrophilic resin composition layer, and provides appropriate heat dissipation and lubrication degree for the drill needle, so that the hole wall roughness during drilling processing can be performed. Degree and contribution to the resin coil on the drill.

The foregoing is a specific embodiment of the present invention and the technical means employed, and many variations and modifications can be derived therefrom based on the disclosure or teachings herein, and can still be regarded as equivalent changes made by the inventive concept. The role of the spirit and the spirit of the text and the scope of the text should be considered within the technical scope of this creation.

In summary, according to the content disclosed above, this creation can achieve the new intended purpose, providing a cover plate for drilling, which is of great value for industrial use, and proposes a new type of patent application according to law.

1‧‧‧metal foil

2‧‧‧Hydrophilic resin composition layer

Claims (14)

A drilling cover plate comprising: a metal foil; and at least one layer of a hydrophilic resin composition layer bonded to the metal foil, wherein the hydrophilic resin composition layer has a reaction enthalpy value of 10 to 40 (J/g) with a melting point between 48 and 70 °C. The cover plate for drilling according to the first aspect of the invention, wherein the metal foil has a thickness of 0.05 mm to 0.2 mm. The cover sheet for drilling according to the first aspect of the invention, wherein the hydrophilic resin composition layer has a thickness of 0.02 mm to 0.15 mm. The cover plate for drilling according to claim 1, wherein the hydrophilic resin composition layer comprises a series selected from the group consisting of polypropylene oxide, polyethylene oxide, polybutylene glycol, and polyolefin. A water-soluble resin having crystallinity of one of ethylene glycol polyester, carboxymethyl cellulose, polyvinylpyrrolidone, polypropylene decylamine and sodium polyacrylate. The cover plate for drilling according to claim 1, wherein the hydrophilic resin composition layer comprises an alcohol ether selected from the group consisting of polyethylene glycol phenol ether and polyethylene glycol alkyl ether. Crystalline water-soluble resin. The cover sheet for drilling according to claim 1, wherein the hydrophilic resin composition layer comprises a crystalline water-soluble resin selected from the group consisting of alcohols such as hexahydrin, propylene glycol and glycerin. . The slab for drilling according to the invention of claim 4, wherein the water-soluble resin is further mixed with an inorganic compound, an antifoaming agent and a surfactant to form the hydrophilic resin composition layer. . The cover plate for drilling according to claim 7, wherein the inorganic compound is talc One or more of powder, molybdenum disulfide, zinc molybdate, calcium carbonate, graphite, boron nitride, aluminum nitride, aluminum oxide, aluminum hydroxide, or the like. The cover plate for drilling according to claim 7, wherein the antifoaming agent is a modified polyoxyalkylene resin and related derivatives thereof, and the fatty acid, fatty acid amine, polyether thereof One or more of the compounds and the like. The cover sheet for drilling according to claim 7, wherein the surfactant is a compound having a hydrophilic portion and a lipophilic portion in one molecule, wherein the hydrophilic portion has a carbonate, Sulfate or the like, the lipophilic moiety has a linear chain, a side chain or even a cyclic aromatic hydrocarbon group. The cover sheet for drilling according to claim 7, wherein the hydrophilic resin composition layer is 20 parts by weight of a water-soluble resin having a number average molecular weight of 300,000 to 400,000, and water-soluble with a number average molecular weight of 10,000 to 80,000. After 60 parts by weight of the resin is dissolved in water, 8 parts by weight of the inorganic compound is added and stirred and completely dispersed in the aqueous solution of the water-soluble resin, followed by further adding 2 parts by weight of the antifoaming agent and 2 parts by weight of the surfactant, followed by stirring and It is formed by completely dispersing it in an aqueous solution of a water-soluble resin. The cover sheet for drilling according to claim 7, wherein the hydrophilic resin composition layer is 20 parts by weight of a water-soluble resin having a number average molecular weight of 200,000 to 300,000, and water-soluble with a number average molecular weight of 300,000 to 400,000. After 60 parts by weight of the resin is dissolved in water, 8 parts by weight of the inorganic compound is added and stirred and completely dispersed in the aqueous solution of the water-soluble resin, followed by further adding 2 parts by weight of the antifoaming agent and 2 parts by weight of the surfactant, followed by stirring and It is formed by completely dispersing it in an aqueous solution of a water-soluble resin. The cover plate for drilling according to claim 1, wherein a primer layer is disposed between the metal foil and the hydrophilic resin composition layer. The casing for drilling according to claim 13, wherein the primer layer is a thermoplastic resin or a thermosetting resin or a mixture of two.