摘要:
This invention relates to a method for molding a sleeve-type reinforced plastic tubular body, such as a pipe coupling, and to a mold therefor. According to the method of this invention, a sleeve-fitted reinforced plastic tubular body is produced by using a mold obtained by assembling a main body and sleeve-molding members fixable and axially slidable to and along the outside surface of the main body. Accordingly, by providing sleeve molding members of different configurations and sizes and using them exchangeably according to the configuration and size of the desired molded article, tubular bodies having a sleeve of different configurations and sizes can be molded as required. Furthermore by adjusting the fixing position of the sleeve-molding member with regard to the main body of the mold, tubular bodies having a tubular section of different lengths can be produced by using one type of mold.
摘要:
To make plastic tubes for lighting poles and the like, a core which is subdivided into a plurality of elements is utilized. The outer circumference of the combined elements corresponds to the desired tube circumference. A web of polyester/glass fiber is first wound around each element, after which the elements are fitted together and additional layers of the web are wound around the outer circumference of the composite unit. Extra reinforcing members may optionally be introduced. After curing, the core elements are removed.
摘要:
The invention relates to a tape, comprising at least one layer comprising a. endless fiber in an total amount of at least 40 volume % as compared to the total volume of the layer and b. a thermoplastic matrix comprising one or more polyamides containing one or more aliphatic monomeric units, c. and optionally heat stabilizer, flame retardant, colorant, lubricant, mold release agent, UV stabilizer, impact modifier, laser absorbing additive as well as combinations thereof; wherein the one or more polyamides have a CH2-ratio of at least 5.5 and less than 10, calculated by - identifying the number of different aliphatic monomeric units in the one or more polyamides; - determining the number of CH2 groups per aliphatic monomeric unit for each of these different aliphatic monomeric units; - calculating the sum of the so determined numbers of CH2 groups; - dividing said sum by the number of different aliphatic monomeric units in the one or more polyamides; taking into account only the aliphatic monomeric units present in the one or more polyamides in an amount of at least 10 wt% with respect to the total weight of the one or more polyamides. The invention also relates to a vessel prepared by employing these tapes.
摘要:
Method for producing a leak-tight vessel (14) for holding a gas and/or liquid, comprising the steps of winding a heat-sealable thermoplastic barrier strip (60) around a removable mandrel (1) in such a way that each strip fragment overlaps with a substantially parallel strip fragment over at least a lateral overlapping distance, consolidating the overlapping strip fragments so as to form a gas and/or liquid tight layer (49), winding a fibrous material (12) around the gas and/or liquid tight layer, thereby leaving an opening (4) large enough for removing the mandrel. Also described is a leak-tight vessel produced in this way.
摘要:
An actuating system of sectors of a device (2) for producing an airplane fuselage. Each sector is provided with an actuating system (27) of the screw - nut screw type in which a threaded element (31) is rotated about a rotation axis (32) by a motor (28). The threaded element (31) comprises an internal shaft (33) made of a first material and extending along the rotation axis (32) and an external tubular portion (34) made of a second material, mounted axially on a portion of the shaft and provided externally with a thread. Constraint means (38) are provided between the internal shaft (33) and the tubular portion (34) adapted to prevent angular displacement of the tubular portion (34) with respect to the internal shaft (33) allowing linear sliding of the tubular portion (34) with respect to the internal shaft (33). A thermal stress applied to the threaded element (31) produces the sliding of a free end portion (34a) of the tubular portion (34) with respect to the internal shaft (33) so that an increase in the temperature does not produce an overall elongation of the threaded element (31) maintaining each sector in the expanded lamination position previously defined.
摘要:
A method of and apparatus for forming one or more flanges or formations, which may conveniently be inwardly facing, on or in a hollow continuously wound structural member, such as a hollow pole, the method including the steps of providing a tapered mandrel on which to continuously wind a loop of filament or filaments to form a hollow structural member, providing an end-forming plate at at least one end of the mandrel, placing one or more formers on the outside of the mandrel adjacent to and spaced from the or each end plate by a required amount to form one or more flanges when the member has been fully wound and set within a resin, and subsequently removing the continuously wound structural member from the mandrel.
摘要:
A method of forming a fire fighting monitor includes forming a core in the shape of a non-linear waterway of a monitor body, applying a composite material over the core, and then curing the composite material to thereby form the fire fighting monitor body.
摘要:
An actuating system of sectors of a device (2) for producing an airplane fuselage. Each sector is provided with an actuating system (27) of the screw - nut screw type in which a threaded element (31) is rotated about a rotation axis (32) by a motor (28). The threaded element (31) comprises an internal shaft (33) made of a first material and extending along the rotation axis (32) and an external tubular portion (34) made of a second material, mounted axially on a portion of the shaft and provided externally with a thread. Constraint means (38) are provided between the internal shaft (33) and the tubular portion (34) adapted to prevent angular displacement of the tubular portion (34) with respect to the internal shaft (33) allowing linear sliding of the tubular portion (34) with respect to the internal shaft (33). A thermal stress applied to the threaded element (31) produces the sliding of a free end portion (34a) of the tubular portion (34) with respect to the internal shaft (33) so that an increase in the temperature does not produce an overall elongation of the threaded element (31) maintaining each sector in the expanded lamination position previously defined.