Abstract:
Ein Schmelzeleitsystem (128) für In-Mold-Decoration (IMD)- oder In-Mold-Labeling (IML)-Verfahren zum Spritzgießen von flachen Kunststoffteilen (110), mit wenigstens einer Band- oder Filmanbindung (130) und einem Angussverteiler (136), weist zwischen der Anbindung (130) und dem Angussverteiler (136) eine Staukammer (140) mit einem gegenüber dem Angussverteiler (136) quer zur Fließrichtung des Spritzmaterials erweiterten Querschnitt auf. Ein In-Mold-Decoration (IMD)- oder In-Mold-Labeling (IML)-Spritzgieß-Verfahren in welchem ein Schmelzeleitsystem (128) nach einem der vorhergehenden Ansprüche verwendet wird ist zur Herstellung einer berührungssensitiven Anzeigenblende, insbesondere zur Herstellung einer Anzeigenblende für Haushaltsgeräte geeignet.
Abstract:
System (10) for the injection moulding of plastic material comprising: an injection device (12) of the hot runner type for the injection of a plastic material (MP), in the molten state, into a mould (11, 11a, 11b); a circular diaphragm (13) to distribute evenly and circularly in the cavity (11b') of the mould, through a circular injection gate or port (25), the plastic material (MP) injected by the injection device (12), and control means (21, 22, 23, 24) adapted to control the operation of the moulding system and including in particular a heating inductor (21 ), driven in frequency, additional with respect to the heating means (16) provided to heat and keep at a hot temperature the injection device (12), and a thermocouple (22), with both the heating inductor (21 ) and the thermocouple (22) being arranged in the area of the circular injection gate (25); wherein these control means (23, 24) are adapted to control through the heating inductor (21 ), by taking into account the temperature measured by the thermocouple (22) and of the characteristics, in particular rheological and physical (D-1, D-2), of the plastic material used to mould a piece, the temperature (T, T+, T-) of the area of the circular injection gate (25), so as to keep under control in real time the moulding cycle of the piece (PZ). The new system (10) of injection moulding is particularly suitable for moulding pieces (PZ, PZ-10) which typically have a form of a solid of rotation with cylindrical outer surfaces or the like, and is configured in the area of the circular injection port (25) so as to avoid the formation of waste or superfluous parts, such as a sprue, which must be subsequently removed from the piece, once moulded.
Abstract:
The invention relates to a mould part of a mould for encapsulating electronic components mounted on a carrier, comprising at least one mould cavity provided in said mould part and at least one runner for moulding material connecting to said mould cavity, wherein the gate from said runner to said mould cavity has an oblong shape. The invention also relates to a mould with at least one such mould part. The invention also provides a method for encapsulating electronic components mounted on a carrier, wherein the liquid moulding material is fed into the mould cavity through a wide supply opening. Finally, the invention also provides an encapsulated electronic component mounted on a carrier, which component is manufactured by this method.
Abstract:
An arrangement is provided in an injection mould with a hot-runner system, comprising a stationary mould part (4) and a movable mould part (6) including mould cavities (8), runner blocks (10), tab sleeves (12), at least one needle valve (2) movable between two end positions, and an operating means (16, 24). The novel features of the inventive arrangement reside in that the needle valve (2) has at least one bore extended in the axial direction for providing a tubular valve, that a core (22) is at least partly supported in said bore for movement relative to the needle valve (2), and that a portion of the core (22) extends into the mould cavity (8) to form a dead hole or a through hole in the finished moulded article.
Abstract:
The present disclosure relates to a method of building an insulation system around a naked conductor section of a power cable, which power cable has a conductor which includes the naked conductor section and which power cable comprises an insulation system already provided around a majority of the conductor. The insulation system comprises an inner semiconducting layer arranged around the conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, and which conductor has a naked conductor section. The method comprises: a) placing the naked conductor section in a mould, and b) moulding an insulation system around the naked conductor section, wherein the moulding of the insulation system involves injecting a first semiconducting compound into a first mould cavity to form an inner semiconducting layer around the naked conductor section, injecting an insulation compound into a second mould cavity to form an insulation layer around the inner semiconducting layer, and injecting a second semiconducting compound into a third mould cavity to form an outer semiconducting layer around the insulation layer.
Abstract:
In a method for injection molding a fastening element (1, 21) from plastic by means of an injection mold that encloses a cavity and that molds a fastening element (1, 21) having a body (2, 22) extending along an axis with a wall (3) that encloses a hole (4, 24) extending in the axial direction for accommodating a stud or the like, the injection mold is designed such that the cavity has a uniform thickness, wherein liquid crystal polymer material (LCP) is used as the plastic and is injected centrally into the cavity of the injection mold at an axial injection end in such a manner that the flow front of the material advances uniformly axially into the cavity.
Abstract:
An injection moulding device for injection moulding a flexible sleeve body for a squeezable tube, comprises a male mould part and a female mould part, which in combination with the male mould part forms a sleeve body cavity for forming the flexible sleeve body between them. The sleeve body cavity extends from a top end to an opposite bottom end in a longitudinal direction. The mouding device further comprises a runner end part, which in combination with the female mould part and the male mould part forms a runner cavity at the top end of the sleeve body cavity. The runner cavity comprises a passage constituted by one or more openings connecting the annular shaped distribution channel with the sleeve body cavity for guiding the molten plastics material from a runner distribution channel into the sleeve body cavity. The one or more openings is/are evenly distributed along the perimeter of the sleeve body cavity and is/are narrow compared to the distribution channel upstream of the passage, such that the passage initially prevents the flow of molten plastics material from entering the sleeve body cavity, which results in a pressure build up in the runner cavity which eventually results in a pressure high enough to force the flow of molten plastics material through the passage into the sleeve body cavity.
Abstract:
The invention relates to a method and a system for producing a needle of plastic, as well as a needle of plastic, in particular a needle for medical purposes. The method for producing a plastic needle, which needle has two ends, wherein at least the outer diameter of one end is less than 0.50 mm, said needle further having a longitudinal lumen extending between two openings of the needle, in a moulding system having an assembly comprising a feed system and a mould cavity, comprising the following steps: introducing a melt of plastic into the feed system, increasing the melt pressure gradually during melt passage through the feed system, passing the melt into the mould cavity, whereby the melt substantially fills the mould cavity, cooling the melt in the mould cavity whereby the melt solidifies to a needle, and removing the needle from the mould cavity. By gradually increasing the pressure through the feed system it is possible to meet the specific pressure demands at the entrance of the mould cavity in order to mould the thin and elongated articles in spite of the small shot volume, because the melt will then reach a sufficient pressure before it enters the mould cavity. Accordingly, the entire mould cavity will substantially be filled by the melt, so the predetermined length and diameter of the needles is obtained.
Abstract:
Smart cards having high quality external surfaces (55, 58) can be made through use of partially cured, low shrinkage glues (42, 42', 62, 62') to hold the smart card's electronic elements (30, 32) during their immersion in a thermosetting material (34) that becomes the core layer of the cards.