Drilling Entry Sheet Resin Composition for Accurate Hole Positioning
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Solution Overview
Problem
Existing entry sheets for drilling laminated or multi-layer boards face issues with weak adhesion strength between the metallic foil and the resin composition, leading to poor hole position accuracy and increased drill breakage, often requiring an adhesion layer that can interfere with lubrication and increase costs.
Innovation Solution
An entry sheet comprising a metallic foil with a resin composition layer containing a polyolefin resin and a water-soluble resin, where the polyolefin resin content is between 25-50 parts by mass and the water-soluble resin content is between 50-75 parts by mass, with a high-molecular-weight water-soluble resin, eliminating the need for an adhesion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion layer is provided between the metallic foil and the resin composition layer, then the adhesion strength is improved, but the lubricating effect is prevented and hole position accuracy deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the resin layer by incorporating specific functional groups (carboxyl, hydroxyl, or amino groups) with controlled content (0.1-10 mmol/g). This parameter modification enables the resin layer to directly bond with the aluminum foil while maintaining lubricating properties, eliminating the need for a separate adhesion layer.
Solution Approach 2:
The invention creates a composite resin composition combining lubricating agents (polyethylene glycol, polypropylene glycol, or polyvinylpyrrolidone) with polymers containing specific functional groups. This composite structure provides both adhesion to the metallic foil and lubricating effect during drilling, resolving the contradiction between strength and precision.
2Strength
If an adhesion layer is provided between the metallic foil and the resin composition layer, then the adhesion strength is improved, but the device complexity and production cost increase
Solution Approach 1:
The invention merges the functions of the adhesion layer and the resin composition layer into a single integrated resin layer. The functionalized resin layer simultaneously provides both adhesion to the aluminum foil and lubricating properties, eliminating the separate adhesion layer and simplifying the overall structure.
Solution Approach 2:
The resin composition layer is designed to perform multiple functions: it adheres to the metallic foil, provides lubrication during drilling, and maintains hole position accuracy. This multi-functional design eliminates the need for specialized adhesion layers, reducing structural complexity.
3Strength
If an adhesion layer is provided between the metallic foil and the resin composition layer, then the adhesion strength is improved, but the raw material cost increases
Solution Approach 1:
The invention combines the adhesion and lubrication functions into a single resin layer, eliminating the need for separate adhesion layer materials. This reduces the total quantity of materials required and simplifies the bill of materials, thereby reducing raw material costs.
Solution Approach 2:
The resin composition layer is designed to be self-sufficient by incorporating functional groups that provide both adhesion and lubrication properties. This self-service capability eliminates the need for additional adhesion layer materials and reduces overall material consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides strong adhesion and excellent hole position accuracy during drilling without an adhesion layer, reducing raw material costs and simplifying production while enhancing drill longevity and hole quality.
Implementation Method 1
a method for drilling processing using a sheet containing a water-soluble resin such as a polyethylene glycol is proposed
Implementation Method 2
an adhesion layer (adhesion film) containing a urethane-based compound, a vinyl acetate-based compound, a vinyl chloride-based compound, a polyester-based compound, a copolymerized product thereof, an epoxy-based compound, a cyanate-based compound, or the like formed between the metallic foil and the layer of the resin composition
Data Source
AI summary
An entry sheet for drilling comprising: a metallic foil; and a layer of a resin composition on at least one surface of the metallic foil, the resin composition comprising a polyolefin resin (A) and a water-soluble resin (B), wherein a content of the polyolefin resin (A) is 25 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), a content of the water-soluble resin (B) is 50 parts by mass or more and 75 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), and the water-soluble resin (B) comprises a high-molecular-weight water-soluble resin (B-1) having a weight average molecular weight of 2×105 or higher and 1.5×106 or lower.