A process for producing a cap or closure comprising obtaining a polypropylene composition by sequential polymerization comprising the steps: A) polymerizing in a first reactor, preferably a slurry reactor, in the presence of a Ziegler-Natta catalyst monomers comprising propylene and optionally one or more comonomers selected from ethylene and C4-C10 alpha-olefins, to obtain a first propylene polymer fraction having a comonomer content in the range of 0.0 to 1.8 wt %, and a MFR2 in the range of from 12.0 to 40.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg; B) polymerizing in a second reactor, preferably a first gas-phase reactor, monomers comprising propylene and one or more comonomers selected from ethylene and C4-C10 alpha-olefins, in the presence of the first propylene polymer fraction, to obtain a second propylene polymer fraction, wherein the polypropylene composition comprising said first and second propylene polymer fractions has an MFR2 in the range of from 12.0 to 60.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg, has a comonomer content in the range of from 2.2 to 5.0 wt % and wherein the ratio of the comonomer content of component A) to the comonomer content of the polypropylene composition is 0.35 or less, C) melting, extruding and moulding the polypropylene composition in the presence of at least one nucleating agent to prepare a cap or closure; and D) exposing the cap or closure obtained in step (C) to a cooling rate of 50 K/s or more.

A passive horn integrally formed using thermoplastic vulcanized rubber includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groove is disposed in the second outer casing, and the first outer casing is disposed in the groove. The back surface of the vibrating membrane is provided with a casing groove sequentially embedded with the inner casing and the iron piece. Furthermore, a preparation method of a passive horn integrally formed using thermoplastic vulcanized rubber, which, under the condition of integrated injection molding, may improve the yield rate, ensure product quality, save assembly time and labor cost, and improve production efficiency.

The present application belongs to the field of heat conducting materials technology, and in particular, to a preparation method of a heat conducting interface material. The present application discloses a preparation method of a heat-conducting interface material, which comprises: S1, stirring and mixing; S2. orientation process: putting a mixed material obtained in the step S1 into a hydraulic injection extruder, spitting the material out through a needle nozzle and arranging the material neatly in a container in a strip shape, and after stacking the material to ½-¼ of a height of the container, vibrating the material in a vibrating compactor and repeatedly performing stacking 2-4 times; S3, vacuum compaction; S4. curing; S5. slicing.

The present application belongs to the field of heat conducting materials technology, and in particular, to a preparation method of a heat conducting interface material. The present application discloses a preparation method of a heat-conducting interface material, which comprises: S1, stirring and mixing; S2. orientation process: putting a mixed material obtained in the step S1 into a hydraulic injection extruder, spitting the material out through a needle nozzle and arranging the material neatly in a container in a strip shape, and after stacking the material to ½-¼ of a height of the container, vibrating the material in a vibrating compactor and repeatedly performing stacking 2-4 times; S3, vacuum compaction; S4. curing; S5. slicing.

The device for demoulding negatives in thermoplastic injection moulds comprises an ejector (1) provided on one of the ends thereof with a figure insert (2) with a profile complementary to the part that is to be moulded, wherein said ejector (1) comprises an outer tube (11) housing an inner cooling tube (12), which cools said figure insert (2). It allows for a device to be provided for demoulding negatives in thermoplastic injection moulds which enables the part to be obtained to be cooled, the cooling circuit reaching the figure area of the mould.

The device for demoulding negatives in thermoplastic injection moulds comprises an ejector (1) provided on one of the ends thereof with a figure insert (2) with a profile complementary to the part that is to be moulded, wherein said ejector (1) comprises an outer tube (11) housing an inner cooling tube (12), which cools said figure insert (2). It allows for a device to be provided for demoulding negatives in thermoplastic injection moulds which enables the part to be obtained to be cooled, the cooling circuit reaching the figure area of the mould.

In a first step, a circuit sheet is set such that a first region of a second main surface of the circuit sheet is in contact with a plateau portion of a first mold and a second region is not in contact with the first mold. In the first step, a first fixed portion of the circuit sheet is arranged on a first portion of the first mold, and a second fixed portion is arranged on a second portion of the first mold. The first portion is a portion that is higher than the plateau portion and runs along at least one of a first protruding portion and a second protruding portion provided along the plateau portion. The second portion is a portion where the first protruding portion or the second protruding portion is not provided along the plateau portion.

A passive horn integrally formed using thermoplastic vulcanized rubber includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groove is disposed in the second outer casing, and the first outer casing is disposed in the groove. The back surface of the vibrating membrane is provided with a casing groove sequentially embedded with the inner casing and the iron piece. Furthermore, a preparation method of a passive horn integrally formed using thermoplastic vulcanized rubber, which, under the condition of integrated injection molding, may improve the yield rate, ensure product quality, save assembly time and labor cost, and improve production efficiency.

A method of forming a fin configured for use with a water sports board. The method includes providing a mold having a mold cavity and first and second insert pre-preg sheets each including structural strands respectively bonded by first and second resin materials. The method further includes placing the insert pre-preg sheets within the mold cavity. The method further includes injecting a third resin material under pressure into the mold cavity between the first insert pre-preg sheet and the second insert pre-preg sheet to urge the first insert pre-preg sheet and the second insert pre-preg sheet away from each other and towards respective ones of the pair of mold cavity faces, and dispose the third resin material between the first insert pre-preg sheet and the second insert pre-preg sheet to space at least a portion of the first insert pre-preg sheet from the second insert pre-preg sheet.

A method for producing a molded article by injection molding may include using a heat-curable 1K polyurethane (PU) composition, as well as the molded articles obtained using said method.