40results about How to "Prevent interfacial peeling" patented technology

In an electronic control device, an electrically-conductive adhesive is arranged on an outer edge portion of a first surface of a circuit board as a stress reducing portion for reducing stress of the circuit board received by a molding resin. An elastic modulus of the electrically-conductive adhesive is lower than that of the circuit board. The electrically-conductive adhesive is covered by an adhesion improving member. When peeling stress is applied to the circuit board from the molding resin, the electrically-conductive adhesive and the adhesion improving member receive the peeling stress to be deformed. Therefore, the peeling stress to the circuit board is reduced.

A semiconductor device includes a base plate having one main surface joined to an insulating substrate on which a semiconductor chip and the like are mounted and a transfer mold resin which is so provided as to cover the one main surface of the base plate, the insulating substrate, the semiconductor chip, and the like and expose the other main surface of the base plate. The coefficient of linear expansion of the base plate is lower than that of copper and the coefficient of linear expansion of the transfer mold resin is not higher than 16 ppm/° C. The transfer mold resin has such scooped shapes as to expose opposed short-side centers and the vicinity of the base plate, respectively. The base plate has mounting holes in portions exposed by the scooped shapes of the transfer mold resin.

In a surface mount LED, circuit patterns can be formed on selective portions of the bottom and inner circumferential surfaces of a recess in a substrate in which an LED chip is mounted. A sealant material composed of a light transmissive resin can be applied to cover the LED chip for sealing. An intimate contact interface is formed between the material of the insulator/substrate which is exposed at a portion with no circuit pattern formed thereon, and the light transmissive resin. The strength of intimate contact can be enhanced to prevent the circuit patterns and conductive adhesive from peeling off at an interface therebetween.

In order to improve the package body cracking resistance of an LSI package at the reflow soldering and to provide both a leadframe suitable for fabricating the LSI package according to the flexible manufacturing system and an LSI using the leadframe, the adhered area between a semiconductor chip 2 and a resin is enlarged by making the external size of a die pad 3 smaller than that of the semiconductor chip to be mounted thereon. Moreover, a variety of semiconductor chips 2 having different external sizes can be mounted on the die pad 3 by cutting the leading ends of leads 5 to a suitable length in accordance with the external sizes of the semiconductor chips 2.

The invention relates to a compression molding forming method of a plastic plate containing a fiber net. The compression molding forming method is characterized by fixing the fiber net on the surface of an upper die and/or a lower die of a mould pressing die and embedding the fiber net in the plastic plate by virtue of concave-convex lines on the surface of the die, so that the fiber floating condition when the fiber net is fixed on the surface of the upper die and/or the lower die by a conventional method can be avoided, so that the service life of the plastic plate is prolonged; meanwhile, the method is also capable of tensioning the fiber net during forming the plastic plate, so that the strength of the plastic plate is ensured; in addition, the fiber net is embedded in the single plastic material, but not fixed on the plastic plate by virtue of manners of adhesion and the like, so that the two sides of the fiber net are made of the same material, and thus the problem that the interface is stripped in the conventional manners of adhesion, fixation and the like is avoided; the strength of the produced plastic plate is improved; the plastic plate produced by the method can be used as a building template.

The invention provides an electronic circuit package using a composite magnetic sealing material as a mold material. Disclosed herein is an electronic circuit package includes a substrate, an electronic component mounted on a surface of the substrate, and a magnetic mold resin covering the surface of the substrate so as to embed therein the electronic component. The magnetic mold resin includes a resin material and a filler blended in the resin material in a blended ratio of 30 vol. % or more to 85 vol. % or less. The filler includes a magnetic filler containing Fe and 32 wt. % or more and 39 wt. % or less of a metal material contained mainly of Ni, thereby a thermal expansion coefficient of the magnetic mold resin is 15 ppm/ DEG C. or less.

The invention relates to an injection molding method of a fiber network-containing plastic board. According to the injection molding method, a fiber network is fixed on the surface of a female mold and/or a male mold in a mold cavity and is embedded in the plastic board by concave-convex lines on the surface of the mold, and therefore, a phenomenon that the fiber network is only fixed on the surface of the female mold and/or the male mold to cause the fiber flotation is avoided, and the service life of the plastic board is prolonged; and besides, according to the method, the fiber network can be tensioned in a plastic board forming process, and therefore, the strength of the plastic board is ensured; in addition, the fiber network is embedded in a single plastic material and is fixed together with the plastic board without bonding and the like, so that two sides of the fiber network are made of the same material, the interface stripping problem in the traditional bonding and fixing mode is avoided, and the strength of the plastic board is improved; and the plastic board produced by the method can be used as a building template and the like.

The present invention aims to provide a reinforcing film for a flexible printed wiring board capable of suppressing interfacial peeling between a flexible printed wiring board and a reinforcing film that occurs in a reflow process or the like during mounting. The reinforcing film for a flexible printed wiring board according to the present invention is characterized in that it has a laminated structure made of a heat-resistant resin and includes at least one bubble-incorporated layer.

In a gas-barrier laminate having a layer structure of aromatic polyester resin/polyglycolic acid resin/aromatic polyester resin, a small amount of an aromatic polyester resin polymerized with a germanium compound (catalyst) is blended to the polyglycolic acid resin forming the core layer, thereby surface-roughening the polyglycolic acid resin layer. As a result, the peeling resistance between the polyglycolic acid resin/aromatic polyester resin layers is practically improved while maintaining a good gas-barrier property.

The invention discloses an externally-wrapped anchor steel reinforcement structure for a concrete beam and a column joint. The externally-wrapped anchor steel reinforcement structure is composed of penetration steel angles, beam side steel angles, beam side steel plates and column side steel plates, wherein the penetration steel angles, the beam side steel angles, the beam side steel plates and the column side steel plates are connected in a planting bar type post-installed fastening mode. The penetration steel angles penetrate through floors and are connected with the column side steel plates, the beam side steel plates are connected with the penetration steel angles by the beam side steel angle, and therefore a complete set of reinforcement scheme with reasonable force transmission is formed. When the bearing capacity of beams and columns is improved, the problem that a core area of the joint is relatively weak caused by beam and column reinforcement is solved, and brittle shear failure in the core area is avoided; and internal force transmitted to the core area of the joint through the penetration steel angles is evenly distributed onto bolts and steel plates, so that shearing resistance and energy dissipation performance of the core area are greatly improved.

The invention discloses an epoxy-acid anhydride coating capable of being cured at room temperature and a preparation method of the coating. The formula of the coating comprises the following raw materials in parts by weight: 70-80 parts of epoxy resin, 20-30 parts of episulfide resin, a sulfydryl compound with a sulfydryl mole number of 0.10-0.30 of an epoxy mole number of the epoxy resin, an acidanhydride with an acid anhydride mole number of 0.7-1.0 of a sum of the epoxy mole number of the epoxy resin and the episulfide mole number of the episulfide resin, 20-50 parts of a toughening agent,and 100-300 parts of a solvent. According to the coating provided by the invention, the problem that an epoxy acid anhydride coating needs to be cured at a high temperature is solved, the tensile strength of a room-temperature cured coating layer is greater than 60 MPa, the binding force of the room-temperature cured coating layer on a Ly12 aluminum alloy substrate is greater than 12 MPa, the coating has good adhesive force on materials such as metals and engineering plastics, and the application range of the epoxy-acid anhydride coating is expanded.

Disclosed herein is a composite magnetic sealing material having a low thermal expansion coefficient. The composite magnetic sealing material includes a resin material and a filler blended in the resin material in a blended ratio of 30 vol. % or more to 85 vol. % or less. The filler includes a magnetic filler containing Fe and 32 wt. % or more and 39 wt. % or less of a metal material contained mainly of Ni, thereby the thermal expansion coefficient of the composite magnetic sealing material is 15 ppm/DEG C. or less.

In a radiation detecting system including an electric voltage imparting electrode through which a bias electric voltage is applied, a recording photoconductive layer which comprises a-Se and generates electric charges in response to receipt of projection of radiation, a carrier collecting electrode, a charge storing portion which stores electric charges generated in the recording photoconductive layer and a switching element for reading out charge signal stored in the charge storing portion, superposed one on another in this order, an organic resin dielectric layer which is not smaller than 0.01 μm and smaller than 1 μm in thickness, not lower than 10¹² Ωcm in specific resistance and 6×10⁻⁶ to 1.5×10⁻⁴/° C. in thermal expansion coefficient is provided between the recording photoconductive layer and the electric voltage imparting electrode.

The present invention maintains the bonding strength of a flame-retardant rubber, minimizes damage caused by heat, and improves durability. In this conveyor belt, a bonding surface area-increasing section 22A is provided to a belt body 18 and is configured to include a total of two upper and lower inclined surfaces 24A, 24B that are inclined with respect to both the thickness direction and the width direction of the belt body 18 and that are oriented in opposite directions from each other. The upper inclined surface 24A is formed so that when both ends of the upper surface of an upper surfacecover rubber layer 14 in the width direction are designated as start points P1, said upper inclined surface 24A is increasingly displaced in a direction approaching the lower surface of a lower surface cover rubber layer 14 from the starting points P1 to both ends of the conveyor belt 10A in the width direction. The lower inclined surface 24B is formed so that when both ends of the lower surface of the lower surface cover rubber layer 16 in the width direction are designated as start points P2, said lower inclined surface 24B is increasingly displaced in a direction approaching the upper surface of the upper surface cover rubber layer 14 from the starting points P2 to both ends of the conveyor belt 10A in the width direction.

A thermally conductive composition 26 contains a base polymer, an adhesive polymer, and thermally conductive particles. A thermal conductivity of the thermally conductive composition 26 is 0.3 W/mK or more. The base polymer is a silicone polymer. The adhesive polymer contains a methyl hydrogen polysiloxane, an epoxy group-containing alkyltrialkoxysilane, and a cyclic polysiloxane oligomer. The amount of the adhesive polymer is 5 to 35 parts by weight with respect to 100 parts by weight of the base polymer. A thermally conductive sheet of the present invention includes the thermally conductive composition in the form of a sheet. Thus, the present invention provides a thermally conductive composition that has high thermal conductive properties and excellent resilience and that can prevent interfacial peeling due to stress, a thermally conductive sheet including the thermally conductive composition, and a method for producing the thermally conductive sheet.