JP5385078B2 - Drilling plate - Google Patents

Description

  The present invention relates to a punching application plate used when, for example, a hole such as a through hole is formed in a base plate for a printed wiring board, a drilling method using the application plate, and a manufacturing method of the application plate.

  In the present specification and claims, the term “aluminum” is used to include both pure aluminum and aluminum alloys unless otherwise specified. Furthermore, the term “plate” is used to include foil.

  Contains a water-soluble lubricant as a plate on one or both sides of a base plate when a through hole (through hole) is formed on a base plate for a laminated printed wiring board in which a metal foil such as copper is laminated on an insulator. US Pat. Nos. 4,781,495 (Patent Document 1) and 4,929,370 (Patent Document 2) disclose a method of arranging a sheet and performing a drilling process. The lubricant-containing sheet used in this through-hole forming method comprises a solid water-soluble lubricant such as diethylene glycol and dipropylene glycol, and a mixture of a synthetic wax such as a fatty acid and a nonionic surfactant. And is contained in a porous sheet material such as paper.

  Japanese Laid-Open Patent Publication No. 4-92488 (Patent Document 3) discloses a water-soluble lubricant sheet formed by applying polyethylene glycol to a porous sheet as a cover plate. Patent Document 4) discloses a water-soluble lubricant sheet formed by mixing polyethylene glycol and a water-soluble lubricant (polyoxyethylene monoether or ester thereof, etc.) as a cover plate.

  As other references relating to the contact plate, JP-A-5-261699, JP-A-2004-230470, JP-A-2004-9193, JP-T-2004-516149, JP-A-8-155896, JP-A-8-155896 No. 2002-292599.

  Moreover, as a specific manufacturing method of the contact plate, Japanese Patent No. 4106518 (Patent Document 5), Japanese Patent Application Laid-Open No. 2002-66996 (Patent Document 6) and Japanese Patent No. 4010142 (Patent Document 7) A method in which a varnish is produced by mixing dimethylbenzylamine with a solution in which a resin is dissolved, applying the varnish to one surface of an aluminum foil, and heating the coating plate (this method is referred to as “first method”). ), And a method of manufacturing a contact plate by adhering a resin sheet manufactured by an extruder to an aluminum foil with a heating roll (this method is referred to as “second method”).

US Pat. No. 4,781,495 US Pat. No. 4,929,370 JP-A-4-92488 JP-A-4-92494 Japanese Patent No. 4106518 JP 2002-66996 A Japanese Patent No. 4010142

  However, in the first method, it is necessary to sequentially perform a resin dissolving step, a varnish applying step, and a drying step. In the second method, a step of forming a resin into a sheet and a step of bonding a resin sheet are sequentially performed. Since it is necessary to perform this, the number of steps for manufacturing the address plate increases, and as a result, the manufacturing cost of the address plate increases.

  Further, the above-described conventional methods also have problems that the lubricating layer contracts during drying or cooling and curls are generated, or cracks are generated on the surface of the lubricating layer.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to use a punching plate that can inexpensively manufacture a coating plate that can improve the drilling position accuracy, and the coating plate. Another object of the present invention is to provide a drilling method and a manufacturing method of the above-described address plate.

  The present invention provides the following means.

[1] In a hole punching plate in which a water-soluble lubricating layer is formed on at least one surface of an aluminum substrate,
The lubricating layer is an extrusion coating layer of a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer,
The copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is 0.1 to 20% by mass,
The number average molecular weight of the ethylene oxide-propylene oxide copolymer is 10,000 or more,
The melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition measured at a test temperature of 125 ° C. and a test load of 21.18 N are both 0.1 to 100 g / 10 min. Hole punching plate.

  [2] The punching plate according to item 1, wherein the ethylene oxide-propylene oxide copolymer is a random copolymer.

[3] The lubricating layer comprises:
3. The punching plate according to item 1 or 2, comprising 0.1 to 80% by mass of polyethylene oxide and 99.9 to 20% by mass of the ethylene oxide-propylene oxide copolymer.

  [4] The punching plate according to any one of the preceding items 1 to 3 is disposed on the base plate for a printed wiring board, and in this state, the drilling plate and the punching plate from above using a drill A drilling method comprising forming a hole having a diameter of 0.3 mm or less in the base plate for a printed wiring board.

[5] In the method for manufacturing a punching plate in which a water-soluble lubricating layer is formed on at least one surface of an aluminum substrate,
A lubricating layer forming step of forming a lubricating layer of a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer on at least one surface of a substrate by an extrusion coating method,
The copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is 0.1 to 20% by mass,
The number average molecular weight of the ethylene oxide-propylene oxide copolymer is 10,000 or more,
The melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition measured at a test temperature of 125 ° C. and a test load of 21.18 N are both 0.1 to 100 g / 10 min. Manufacturing method for punching.

  The present invention has the following effects.

  In the invention of [1], since the lubricating layer is an extrusion coating layer, the number of manufacturing steps of the address plate can be reduced from the number of conventional steps, thereby reducing the manufacturing cost of the address plate. Furthermore, the thickness of the lubricating layer can be easily changed by controlling the extrusion temperature, the extrusion speed, the substrate feed speed, and the like, so that the lubricating layer can be easily formed thin. In addition, the bonding strength between the substrate and the lubricating layer can be easily increased by increasing the temperature of the water-soluble resin composition film during extrusion coating.

  Further, at the time of extrusion coating, the melted water-soluble resin composition film is cooled by being brought into contact with a cooling roll, so that the molten resin film is rapidly cooled. As a result, a uniform and finely crystallized lubricating layer is formed on the surface of the substrate. When the lubricating layer is crystallized uniformly and finely in this way, the lubricating layer is uniformly melted by heat during drilling, the resistance to the drill is stabilized, and the surface of the lubricating layer becomes smooth. Therefore, the accuracy of the drilling position can be improved.

  Furthermore, when the copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is within a predetermined range, cracking of the lubricating layer after extrusion coating can be prevented, and stickiness and blocking of the lubricating layer can be prevented.

  Furthermore, when the number average molecular weight of the ethylene oxide-propylene oxide copolymer is a predetermined amount or more, stickiness and blocking of the lubricating layer can be reliably prevented, and the lubricating layer can be stably formed during extrusion coating. .

  Furthermore, when the melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition are both within a predetermined range, the molten water-soluble resin composition extruded from the T-die of the extruder of the extrusion coating apparatus It is possible to prevent the problem that the material film is cut at the tip of the T-die, the thickness of the molten resin film (that is, the lubricating layer) is uneven, or the neck-in is greatly generated in the molten resin film. Thereby, a lubricating layer having a uniform thickness can be stably formed.

  In the invention of [2], the ethylene oxide-propylene oxide copolymer is a random copolymer, whereby flexibility can be imparted to the resulting lubricating layer.

  In the invention of [3], the lubricating layer contains the polyethylene oxide in a predetermined range and the ethylene oxide-propylene oxide copolymer in a predetermined range, thereby ensuring that the lubricating layer is not cracked. Can be prevented.

  In the invention of [4], even if the drill has a small diameter, the drill can be prevented from being damaged, and the accuracy of the drilling position can be improved.

  In the invention of [5], the punching plate according to the present invention can be reliably manufactured.

FIG. 1 is a schematic cross-sectional view showing a hole punching plate according to an embodiment of the present invention in an arrangement state at the time of drilling. FIG. 2 is a schematic view of an extrusion coating apparatus used in manufacturing the same plate. FIG. 3 is an enlarged view of a nip portion between a pressure roll and a cooling roll in the extrusion coating apparatus shown in FIG.

  Next, embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes a punching plate according to an embodiment of the present invention. The address plate 1 is formed by forming a water-soluble lubricating layer 3 on one surface of an aluminum substrate 2 over substantially the entire surface.

  Although the board | substrate 2 will not be specifically limited if it is a well-known thing, For example, a soft aluminum board, a semi-hard aluminum board, a hard aluminum board etc. are used.

  The thickness of the substrate 2 is desirably set within a range of 50 to 500 μm. When the thickness of the substrate 2 is 50 μm or more, it is possible to prevent a problem that burrs are generated from the substrate 2 after the drilling process. When the thickness is 500 μm or less, the chips generated during the drilling process can be reliably prevented. It can be discharged.

  The surface of the substrate 2 on which the lubricating layer 3 is formed is preferably subjected to a ground treatment for improving the adhesion with the lubricating layer 3. As the base treatment, a coating treatment of a base agent, an acid treatment, an alkali treatment, a corona treatment, and the like can be applied. As the base agent, commercially available coating agents such as epoxy coating agents, urethane coating agents, polyvinyl alcohol coating agents, vinyl chloride / vinyl acetate coating agents and the like can be used.

  The lubricating layer 3 is an extrusion coating layer of a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer. For example, an ethylene oxide- A water-soluble resin composition containing a propylene oxide copolymer is formed by laminating on one side of the substrate 2.

  The extrusion coating apparatus 10 includes an extruder 11, a pressure roll 13, a cooling roll 14, and the like. A T die 12 is provided at the extrusion tip of the extruder 11. From the T die 12, a molten water-soluble resin composition film 15 that forms the lubricating layer 3 is extruded. 2 and 3, 17 is a nip position between the pressure roll 13 and the cooling roll 14. The “molten resin film 15” described below means a melted water-soluble resin composition film.

  In the extrusion coating method using this extrusion coating apparatus 10, as shown in FIGS. 2 and 3, the belt-like substrate 2 passed between the pressure roll 13 and the cooling roll 14 is sent in the length direction. In this state, the molten resin film 15 continuously extruded from the T-die 12 of the extruder 11 is brought into contact with a position shifted by a shift amount S from the nip position 17 of both rolls 13 and 14 on one side of the substrate 2 to the upstream side. By supplying, the substrate 2 and the molten resin film 15 are sandwiched between the pressure roll 13 and the cooling roll 14, whereby the lubricating layer 3 made of the molten resin is formed in a laminated state on one surface of the substrate 2. . This process is called “lubricating layer forming process”. The coating plate 1 having the lubricating layer 3 formed on one side of the substrate 2 is wound up by a winding roll (not shown). In this extrusion coating method, the shift amount S is desirably 1 to 10 mm, particularly 4 to 8 mm. The band-shaped cover plate 1 wound up by the winding roll is then cut into the length of the product and used.

  According to this extrusion coating method, since the lubricating layer 3 can be continuously formed and cooled on the surface of the substrate 2, the number of manufacturing steps of the coating plate 1 can be made lower than the number of conventional steps, Thereby, the manufacturing cost of the address plate 1 can be reduced. The detailed advantage of forming the lubricating layer 3 by an extrusion coating method will be described later.

  The extrusion temperature in this extrusion coating is desirably about 80 to 200 ° C, particularly 130 to 180 ° C. As the extruder 11 and the T die 12, a normal extruder and a T die can be used. At the time of extrusion coating, it is desirable to set the temperatures of the extruder 11 and the T die 12 so that the extrusion temperature is about 80 to 200 ° C. The formation speed (that is, the coating speed) of the lubricating layer 3 is preferably 5 to 200 m / min, particularly 10 to 50 m / min.

  In addition, the temperature of the cooling roll 14 is desirably in the range of 20 to 40 ° C. The reason is as follows. That is, when the temperature of the cooling roll 14 is 40 ° C. or less, the molten resin film 15 can be reliably cooled, whereby the lubricating layer 3 can be fused or wound on the cooling roll 14 during extrusion coating. A problem (that is, blocking) in which the contact plates 1 wound around the take-up roll stick together can be surely prevented. When the temperature of the cooling roll 14 is 20 ° C. or higher, the occurrence of condensation on the cooling roll 14 can be prevented, and moisture absorption of the lubricating layer 3 can be prevented.

  Therefore, in this embodiment, the lubricating layer 3 is formed from a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer.

  Specifically, the lubricating layer 3 is substantially composed of an ethylene oxide-propylene oxide copolymer, unavoidable impurities, an antioxidant and a surfactant added as necessary, or ethylene. It consists essentially of an oxide-propylene oxide copolymer, polyethylene oxide, unavoidable impurities, an antioxidant and a surfactant added as necessary. Note that the ethylene oxide-propylene oxide copolymer and polyethylene oxide are both water-soluble resin compositions.

  In this lubricating layer 3, the copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is set within a range of 0.1 to 20% by mass. Furthermore, the number average molecular weight (Mn) of the ethylene oxide-propylene oxide copolymer is set to 10,000 or more. Further, the melt flow rates of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition measured at a test temperature of 125 ° C. and a test load of 21.18 N (2.16 kgf) are both 0.1 to 100 g / 10 min. It is set within the range.

  When the copolymerization ratio of propylene oxide is less than 0.1% by mass, the lubricating layer 3 (molten resin film 15) is not imparted with flexibility, and there is a possibility that cracks may gradually occur in the lubricating layer 3 after extrusion coating. Not desirable. On the other hand, if the copolymerization ratio of propylene oxide exceeds 20% by mass, the melting point of the ethylene oxide-propylene oxide copolymer becomes too low, so that the lubricating layer 3 becomes sticky or the winding plate 1 is wound by the winding roll. This is not desirable because blocking may occur during storage of the contact plate 1. Therefore, the copolymerization ratio of propylene oxide is preferably set in the range of 0.1 to 20% by mass, and by doing so, cracking of the lubricating layer 3 after extrusion coating can be prevented, and the lubricating layer 3 Stickiness and blocking can be prevented. A particularly desirable copolymerization ratio of propylene oxide is in the range of 1.0 to 10% by mass.

  The number average molecular weight of the ethylene oxide-propylene oxide copolymer is preferably in the range of 10,000 to 600,000. If the number average molecular weight of the ethylene oxide-propylene oxide copolymer is less than 10,000, the melting point of the ethylene oxide-propylene oxide copolymer becomes too low, and there is a risk that the lubricating layer 3 will still be sticky or blocked. The lubricating layer 3 cannot be stably formed during extrusion coating, which is not preferable. Therefore, it is desirable that the number average molecular weight of the ethylene oxide-propylene oxide copolymer is 10,000 or more. By doing so, stickiness and blocking of the lubricating layer 3 can be surely prevented, and lubrication is performed during extrusion coating. The layer 3 can be formed stably. Desirably, a range of 30,000 to 450,000, particularly 60,000 to 150,000 is desirable.

  In addition, the measurement of the number average molecular weight of an ethylene oxide-propylene oxide copolymer is performed by gel permeation chromatography (GPC), for example.

  When the melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition is less than 0.1 g / 10 min, the melted resin film 15 cannot follow the molding speed during extrusion coating, so that the desired thickness is obtained. If the speed is increased, there is a possibility that the molten resin film 15 pushed out from the T die 12 may be broken at the tip of the T die 12, and as a result, the thickness of the lubricating layer 3 becomes uneven, which is not desirable. On the other hand, when the melt flow rate exceeds 100 g / 10 min, since the tension of the molten resin film 15 becomes too low, the neck-in (that is, the phenomenon in which the width of the molten resin film 15 becomes narrower than the T-die) is increased and stabilized. It is difficult to form the lubricating layer 3 by the extrusion coating method, which is not desirable. Therefore, it is desirable that the flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition is set within a range of 0.1 to 100 g / 10 min. 3 can be formed stably. A particularly desirable melt flow rate is in the range of 0.5 to 20 g / 10 min.

  The melt flow rate is measured according to JIS (Japanese Industrial Standard) K7210.

  Here, the ethylene oxide-propylene oxide copolymer is preferably a random copolymer in that it can control the crystallinity and give the lubrication layer 3 flexibility, but propylene oxide is added. A block copolymer obtained by addition polymerization of ethylene oxide after polymerization can also be used.

  When the lubricating layer 3 contains not only an ethylene oxide-propylene oxide copolymer but also polyethylene oxide, the lubricating layer 3 has a polyethylene oxide content of 0.1 to 80% by mass and an ethylene oxide-propylene oxide copolymer. It is desirable to contain 99.9-20 mass% of a polymer. Polyethylene oxide is optionally added. The addition of polyethylene oxide is desirable in that it has the effect of improving the lubricity of the lubricating layer 3. In particular, it is highly desirable that the lubricating layer 3 contains 10 to 50% by mass of polyethylene oxide and 90 to 50% by mass of ethylene oxide-propylene oxide copolymer.

  The particularly desirable mixing ratio of polyethylene oxide and ethylene oxide-propylene oxide copolymer is related to the copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer. That is, it is particularly desirable to increase the mixing ratio of polyethylene oxide when the copolymerization ratio of propylene oxide is large, and it is particularly desirable to decrease the mixing ratio of polyethylene oxide when the copolymerization ratio of propylene oxide is small.

  The number average molecular weight of the polyethylene oxide is not particularly limited, but is desirably set in the range of 10,000 to 300,000. When the number average molecular weight of the polyethylene oxide is 10,000 or more, surging that may occur during extrusion coating can be surely prevented and stable extrusion can be performed. When the number average molecular weight of the polyethylene oxide is 300,000 or less, it becomes easy to mix the polyethylene oxide and the ethylene oxide-propylene oxide copolymer, so that both can be reliably mixed uniformly. A particularly desirable upper limit of the number average molecular weight of polyethylene oxide is 200,000 or less.

  In addition, the measurement of the number average molecular weight of polyethylene oxide is performed by gel permeation chromatography (GPC), for example.

  Thus, when forming the lubricating layer 3 containing an ethylene oxide-propylene oxide copolymer and polyethylene oxide, after mixing both with a stirrer etc. beforehand, it knead | mixes using a twin-screw extruder, It is desirable to granulate.

  In addition, an antioxidant, a surfactant, and the like are added to the lubricating layer 3 as necessary. As the antioxidant and the surfactant, those conventionally used for the lubricating layer 3 of the conventional coating plate 1 can be used.

  As the surfactant, a water-soluble surfactant is desirably used, and specific examples thereof include polyethylene glycol, polypropylene glycol, polyoxyethylene esters, polyoxyethylene ethers, polyoxyethylene sorbitan monostearate, 1 type (s) or 2 or more types selected from the group which consists of a polyglycerol monostearate, a polyethylene propylene glycol copolymer, etc. are used.

  As the antioxidant, for example, a hindered phenol-based, hindered amine-based, phosphorus-based or sulfur-based antioxidant is used.

  In the present embodiment, the lubricating layer 3 is an extrusion coating layer, that is, formed by an extrusion coating method, and therefore has the following advantages.

  In the extrusion coating method, as described above, the number of manufacturing steps of the address plate 1 can be reduced more than the number of conventional steps, and thereby the manufacturing cost of the address plate 1 can be reduced.

  Furthermore, the thickness of the lubricating layer 3 can be easily changed by controlling the extrusion temperature, the extrusion speed, the substrate feed speed, and the like, so that the lubricating layer 3 can be easily formed thin.

  Furthermore, the bonding strength between the substrate 2 and the lubricating layer 3 can be easily increased by increasing the temperature of the molten resin film 15 during extrusion coating.

  Further, at the time of extrusion coating, the molten resin film 15 comes into contact with the cooling roll 14 of the extrusion coating apparatus 10 and is cooled, so that the molten resin film 15 is rapidly cooled. As a result, a uniform and finely crystallized lubricating layer 3 is formed on the surface of the substrate 2. When the lubricating layer 3 is crystallized uniformly and finely in this way, the melting of the lubricating layer 3 due to heat at the time of drilling becomes uniform, the resistance to the drill 6 is stabilized, and the surface of the lubricating layer 3 is further stabilized. Since this becomes smooth, the accuracy of the drilling position can be improved.

  On the other hand, as another method for forming the lubricating layer on the surface of the substrate, there is a gravure coating method. However, when the lubricating layer is formed by the gravure coating method, there are the following drawbacks.

  In the gravure coating method, water or a mixture of water and an organic solvent is used as a solvent, and the water-soluble resin is dissolved therein. Therefore, it is necessary to dry in order to vaporize the solvent. During this drying, bumping phenomenon and gas escape trace may occur, and it is very difficult to form a lubricating layer having a smooth surface. In particular, when the lubricating layer is thick, bumping phenomena and gas escape traces are very likely to occur. If a bumping phenomenon or a gas escape hole occurs, the surface of the lubricating layer is not smooth, and the accuracy of the drilling position decreases.

  Further, in the gravure coating method, it takes time to dry the solvent, and when the drying temperature is increased to shorten the drying time, bumping phenomenon occurs, and there is a problem that gas escape traces are generated on the surface of the lubricating layer. If the water-soluble resin solution has low wettability with the surface of the substrate 2, the solution is repelled on the surface of the substrate 2, and a uniform thickness lubricating layer cannot be formed. In addition, when changing the thickness of the lubricating layer, it is necessary to replace the engraving roll, change the concentration of the water-soluble resin solution, and the like, so the thickness of the lubricating layer cannot be easily changed.

  As another method for forming the lubricating layer on the surface of the substrate, after forming a water-soluble resin into a film, the resin film is heat bonded (fused) to the substrate, or the resin film is bonded to the substrate with an adhesive. The method of forming a lubricating layer on the surface of a board | substrate by bonding is mentioned. However, such a resin film heating bonding method and a resin film bonding method have the following drawbacks.

  In the resin film heat bonding method, during cooling after heat bonding the resin film to the surface of the substrate, melting unevenness and cooling unevenness are likely to occur, and it is difficult to make the crystallization of the resin film uniform. When such melting unevenness and cooling unevenness occur, the surface of the lubricating layer is not smooth, and the accuracy of the drilling position decreases.

  In the resin film bonding method, the accuracy of the drilling position is lowered due to the presence of the adhesive.

  Furthermore, in the resin film heating bonding method and the resin film bonding method, it is very difficult to thin the resin film, and the thin resin film is easily broken in the bonding process. Furthermore, the lubricating layer is brittle and the bonding strength between the substrate and the lubricating layer is low.

  As described above, the extrusion coating method as a method for forming the lubricating layer 3 is superior to other methods (such as a gravure coating method, a resin film heating and bonding method, and a resin film bonding method).

  Next, a method of making a hole such as a through hole in the printed wiring board base plate 5 using the coating plate 1 of this embodiment will be described below.

  As shown in FIG. 1, first, the plate 1 is placed on the base plate 5 in a superposed manner with the lubricating layer 3 facing up. In this state, the rotating drill 6 is sequentially passed through the contact plate 1 and the base plate 5 in the thickness direction from the upper side of the contact plate 1 (that is, the lubricating layer 3 side). A hole with a diameter of 0.3 mm or less is made in The processing conditions such as the number of rotations of the drill 6 and the travel distance per rotation of the drill 6 are the same as in the conventional method.

  In this drilling method, even if the drill 6 has a small diameter (0.3 mm or less), breakage of the drill 6 can be prevented, and the accuracy of the drilling position can be improved.

  Although one embodiment of the present invention has been described above, the present invention is not limited to that shown in the above embodiment, and various modifications can be made.

  In the present invention, the lubricating layer may be formed on both sides of the substrate instead of one side.

  Further, in the present invention, it is particularly desirable that the plate to be subjected to the hole drilling process using the contact plate is a base plate for a printed wiring board, but is not necessarily limited thereto.

  Next, specific examples and comparative examples of the present invention will be described. However, the present invention is not limited to these examples.

  The following substrates, an ethylene oxide-propylene oxide copolymer, and polyethylene oxide were prepared for manufacturing the cover plate. Table 1 shows the prepared ethylene oxide-propylene oxide copolymer and polyethylene oxide.

  In Table 1, “EO-PO copolymer” means an ethylene oxide-propylene oxide copolymer, “Mn” means a number average molecular weight, and “PO” means propylene oxide. “PO copolymerization ratio” means the copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer, and “PEO” means polyethylene oxide. “%” Means mass%.

<Board>
The thickness of the substrate is 100 μm. The material of the substrate is aluminum alloy number A1050-H18 according to JIS. Note that the surface of the substrate on which the lubricating layer is formed is pretreated with a polyvinyl alcohol-based coating agent in advance.

<Ethylene oxide-propylene oxide copolymer (EO-PO copolymer)>
Five types of ethylene oxide-propylene oxide copolymers shown in Table 1 were prepared. These are all random copolymers. The kind of ethylene oxide-propylene oxide copolymer is as follows.

  Type A is an ethylene oxide-propylene oxide copolymer having a number average molecular weight (Mn) of 30,000 and a propylene oxide copolymerization ratio (PO copolymerization ratio) of 1.0 mass%.

  Type B is an ethylene oxide-propylene oxide copolymer having a number average molecular weight (Mn) of 60,000 and a propylene oxide copolymerization ratio (PO copolymerization ratio) of 3.0% by mass.

  Type C is an ethylene oxide-propylene oxide copolymer having a number average molecular weight (Mn) of 120,000 and a propylene oxide copolymerization ratio (PO copolymerization ratio) of 10% by mass.

  Type D is an ethylene oxide-propylene oxide copolymer having a number average molecular weight (Mn) of 1,000,000 and a propylene oxide copolymerization ratio (PO copolymerization ratio) of 10% by mass.

  Type E is an ethylene oxide-propylene oxide copolymer having a number average molecular weight (Mn) of 450,000 and a propylene oxide copolymerization ratio (PO copolymerization ratio) of 20 mass%.

<Polyethylene oxide (PEO)>
Three types of F to G polyethylene oxides shown in Table 1 were prepared. The types of polyethylene oxide are as follows.

  Type F is polyethylene oxide having a number average molecular weight (Mn) of 10,000.

  Type G is polyethylene oxide having a number average molecular weight (Mn) of 100,000.

  Type H is polyethylene oxide having a number average molecular weight (Mn) of 200,000.

<Examples 1-8, Comparative Examples 1 and 2>
In accordance with the method of manufacturing the coating plate of the above embodiment, a water-soluble lubricating layer (thickness: 80 μm) is extrusion coated on one side of the substrate with various contents of ethylene oxide-propylene oxide copolymer and polyethylene oxide being changed. To produce an address plate. Table 1 shows the contents of the ethylene oxide-propylene oxide copolymer and polyethylene oxide forming the lubricating layer in each example and comparative example.

  The extrusion conditions (coating conditions) for the extrusion coating are as follows.

<Extrusion coating conditions>
Extrusion temperature: 170 ° C
Cooling roll temperature: 30 ° C
Pressurizing force of the pressure roll: 0.2 MPa
Substrate feed rate: 20 m / min
Deviation amount S: 6 mm

  As shown in FIG. 3, the shift amount S means the shift amount upstream of the contact position of the molten resin film 15 with the substrate 2 with respect to the nip position 17 between the pressure roll 13 and the cooling roll 14. doing.

  The melt flow rate of the ethylene oxide-propylene oxide copolymer and the melt flow rate of the water-soluble resin composition (that is, the mixed resin composition of the ethylene oxide-propylene oxide copolymer and polyethylene oxide) are both The measurement was performed at a test temperature of 125 ° C. and a test load of 21.18 N (2.16 kgf) in accordance with JIS K7210.

  In the coating plate manufactured in this way, as the state of the lubricating layer, the presence or absence of cracks and stickiness of the lubricating layer and the thickness uniformity of the lubricating layer were investigated. Further, as the surface roughness of the lubricating layer, the arithmetic average roughness Ra and the maximum height Rz were measured in accordance with JIS B0601 (2001). Moreover, the accuracy of the drilling position was evaluated using a drilling tester. The evaluation method of the accuracy of the drilling position is as follows.

<Evaluation method of accuracy of drilling position>
The plate was placed on the three printed wiring board base plates stacked on top of each other, with the lubricating layer facing up. In this state, 2000 through-holes were drilled from the upper side of the lubrication layer to the contact plate and the three base plates with a drill having a diameter of 0.2 mm and a length of 3.5 mm. Next, for each hole drilled in the third base plate from the top of the three base plates, the hole position is measured by the hole position measuring device, and the average value and the maximum value of the deviation of the hole position from the reference value are calculated. Examined.

  The above evaluation results are shown in Table 1.

  As shown in Table 1, in Examples 1 to 8, the lubricating layer was free from cracks, the lubricating layer was hardly sticky, and the thickness of the lubricating layer was uniform. Therefore, the lubricating layer was good. Furthermore, the surface roughness of the lubricating layer was small, and the surface of the lubricating layer was smooth. Therefore, the accuracy of the drilling position was high.

  On the other hand, in Comparative Example 1, cracks were gradually generated in the lubricating layer after extrusion coating. In Comparative Example 2, since the melt flow rate was low, the thickness of the lubricating layer became non-uniform. Furthermore, in Comparative Examples 1 and 2, the accuracy of the drilling position was low.

  INDUSTRIAL APPLICABILITY The present invention can be used for, for example, a punching application plate, a drilling method, and a manufacturing method of a contact plate that are used when forming a hole such as a through hole in a base plate for printed wiring board.

1: Addressing plate 2: Substrate 3: Lubricating layer 5: Base plate for printed wiring board 6: Drill 10: Extrusion coating apparatus

Claims (5)

In a hole punching plate in which a water-soluble lubricating layer is formed on at least one surface of an aluminum substrate,
The lubricating layer is an extrusion coating layer of a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer,
The copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is 0.1 to 20% by mass,
The number average molecular weight of the ethylene oxide-propylene oxide copolymer is 10,000 or more,
The melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition measured at a test temperature of 125 ° C. and a test load of 21.18 N are both 0.1 to 100 g / 10 min. Hole punching plate.   The punching plate according to claim 1, wherein the ethylene oxide-propylene oxide copolymer is a random copolymer. The lubricating layer is
The punching plate according to claim 1 or 2, comprising 0.1 to 80% by mass of polyethylene oxide and 99.9 to 20% by mass of the ethylene oxide-propylene oxide copolymer.   The punching plate according to any one of claims 1 to 3 is disposed on a base plate for a printed wiring board, and in this state, the punching plate and the print from above using a drill. A drilling method comprising forming a hole having a diameter of 0.3 mm or less in a base plate for a wiring board. In the method for manufacturing a punching plate in which a water-soluble lubricating layer is formed on at least one surface of an aluminum substrate,
A lubricating layer forming step of forming a lubricating layer of a water-soluble resin composition containing an ethylene oxide-propylene oxide copolymer on at least one surface of a substrate by an extrusion coating method,
The copolymerization ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is 0.1 to 20% by mass,
The number average molecular weight of the ethylene oxide-propylene oxide copolymer is 10,000 or more,
The melt flow rate of the ethylene oxide-propylene oxide copolymer and the water-soluble resin composition measured at a test temperature of 125 ° C. and a test load of 21.18 N are both 0.1 to 100 g / 10 min. Manufacturing method for punching.

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