摘要:
Disclosed is a method for producing blow moldings of essentially polycarbonate resin. The blow moldings may have a relatively high percentage of hollowness, and may have a ribbed structure, and their wall thickness is uniform. Forming ribs in the blow moldings is easy. Also disclosed is a polycarbonate resin composition for the method. The polycarbonate resin composition is for gas assist injection molding and comprises (A) from 30 to 100% by weight of a polycarbonate resin and (B) from 0 to 70% by weight of a styrenic resin. The melt viscosity ratio, &eegr;H/&eegr;L, of the melt viscosity of the resin composition, &eegr;H (Pa·sec), measured at a shear rate of 10 (sec−1) at the optimum molding temperature to the melt viscosity thereof, &eegr;L (Pa·sec), at a shear rate of 1000 (sec−1), is at least 5. When the polycarbonate resin composition is molded into blow moldings in a mode of gas assist injection molding, the mold cavity volume is expanded while the pressure gas is still in the resin melt in the mold cavity. Provided are the blow moldings of the polycarbonate resins produced in the gas assist injection molding method.
摘要:
Provided are a flame-retardant polycarbonate resin composition having good blow moldability, and blow moldings of the composition having good flame retardancy and having good impact resistance, high mechanical strength and good thermal stability intrinsic to polycarbonate resins. The composition comprises 100 parts by weight of a resin or resin mixture of (A) from 30 to 100% by weight of a polycarbonate resin and (B) from 0 to 70% by weight of a styrenic resin, from 1 to 50 parts by weight of (C) a flame retardant, and from 1 to 20 parts by weight of (D) a methyl methacrylate polymer having a weight-average molecular weight of at least 1,000,000, and optionally contains (E) a fluoro-olefinic resin, (F) a rubber-like elastomer, and (G) an inorganic filler.
摘要:
An inner and outer pressure difference alleviating device for an air tight case (10) is provided including a housing (20) and a cover (30). The cover is adapted to close an opening in housing (20). A diaphragm portion (34) that is made from a flexible material is formed integrally with cover (30) or a side wall of the housing (20). When a pressure difference between the inside and outside of the airtight case (10) is produced by heat generated by electric and electronic components contained in housing (10) diaphragm portion (34) elastically deforms to change the inner volume of airtight case (10) and eliminate the pressure difference between the inside and outside of airtight case (10) automatically, while retaining the air-tightness of the airtight case (10).
摘要:
A crystal unit includes a unit base in which a metal flange is welded to an outer circumference of a base main body, a crystal element held by supporters on the unit base, and a metal cover that is jointed to the metal flange to cover and hermetically encapsulate the crystal element. The base main body is formed of ceramic. A first metal film, to which the metal flange is joined, is formed on a surface of the outer circumference of the base main body. At least two places of the main body, second metal films are formed on an inner bottom face of the main body, and third metal films are formed on an outer bottom face of the main body. The second metal films and the third metal films are electrically connected to one another through via holes. The supporters are joined to the second metal films.
摘要:
A gas-permeable plug is adapted to be inserted in an insertion hole formed through a part of a casing in an inward-outward direction. The gas-permeable plug has a plug body and a permeable sheet including therein countless minute permeable pores. The plug body is injection molded from a material having rubber-like elasticity and the permeable sheet is integrally bonded to a sheet bonding portion by an anchor operation such that when the plug body is injection molded, at the sheet bonding portion, a part of a heat-melted liquid resin enters the minute permeable pores and/or the permeable gaps in irregular directions by the injection molding pressure and is solidified.
摘要:
A through hole (50) with an annular groove (52) provided about its periphery is formed in a resin case (10). The through hole (10) is covered with a water/oil-repellent film (40) comprising a porous film (44). The through hole (50) makes the resin case (10) gas-permeable, and the water/oil-replacement film (40) prevents entry of external water and oil, etc.
摘要:
In a vehicular braking control apparatus and method, the hydraulic pressure on a wheel cylinder is gradually reduced with a relatively gentle gradient of reduction (k3) at the time when a braking operation member, operated by an operating person of the vehicle, is detected to have been operated to a predetermined position. At the time when a state of the braking operation is detected to have reached a predetermined threshold, the hydraulic pressure on the wheel cylinder is reduced with a relatively great gradient of reduction (k2). Therefore, it is possible to reduce vibrations of a brake pedal or the change in deceleration while adopting a relatively simple construction.
摘要:
A mask for exposure is supported at three positions on a holding surface of a mask chuck of an X-ray exposure apparatus by means of kinematic mounting. Magnetic units, each comprising an electromagnet, and magnetic rings are provided around supporting points at the three,positions on the mask chuck and on the mask frame, respectively. It is thereby possible to generate a tensile force to magnetically attract the mask frame in the direction of the normal of the holding surface of the mask chuck, and to attract and hold the mask on the mask chuck. Thus, the mask can be chucked on the X-ray exposure apparatus in substantially the same state as that of a mechanical clamp on an electron beam (EB) scanning apparatus while the mask is manufactured, without using a mechanical clamping mechanism.
摘要:
A connector casing E required to have a sealing property includes a cover 2. The cover 2 has a cover main body 10 provided with a large vent hole H0 passing through the connector casing E in an inward and outward direction and having a predetermined inner diameter size. A permeable sheet S, which permits permeation of a gas and prevents permeation of a liquid and a solid, is integrally joined to an outside peripheral part of the large vent hole H0 so as to cover the large vent hole H0 from its outside. A cover insert member C is disposed outside the permeable sheet S to cover the permeable sheet from the outside, and a ring-shaped protrusion 22 is hermetically joined to the casing main body 10. The cover insert member C1 is provided with a small vent hole H1 which has an inner diameter smaller than the large vent hole H0 and communicates with the large vent hole H0 through the permeable sheet S.
摘要:
In a structure of mounting a wheel cap to a wheel, a plurality of pairs of support plates are projectingly provided on an inner wall of the wheel cap made of a synthetic resin and arranged annularly so that the support plates in each pair are opposed to each other in a circumferential direction. A pair of elastic support legs extending from opposed surfaces of the support plates in each pair are integrally connected to each other to form a V-shape. A locking claw is formed on a connection between the support legs and capable of being engaged into a locking recess in an inner peripheral surface of a rim of the wheel. An annular setting spring is connected to the locking claws for biasing the locking claws in a direction to come into engagement in the locking recess. Thus, it is possible to form each of the support legs supporting each of the locking claws sufficiently long to enhance the flexibility of the support leg, thereby improving durability of the support legs and mounting property of the wheel cap.