[article]
Titre : |
Making a racket for plastics : New ways to attain special part properties are advancing the art of injection molding |
Type de document : |
texte imprimé |
Auteurs : |
Christoph Jaroschek, Auteur |
Année de publication : |
2018 |
Article en page(s) : |
p. 6-18 |
Langues : |
Anglais (eng) |
Catégories : |
Matières plastiques -- Moulage par injection
|
Index. décimale : |
668.4 Plastiques, vinyles |
Résumé : |
Making a racket is part of the trade. In the past, tradesmen would do this at markets by swinging wooden rattles to attract attention. Today, instead, it is the industry which is trying to make its developments heard and accepted, for example at trade fairs and in the media. What has injection molding technology had to offer recently, aside from Industry 4.0? The answer is process developments that in the main expand the range of applications for plastic parts, mechanical assistance systems that enable consistently high part quality to be achieved more reliably, and the huge field of temperature control. |
Note de contenu : |
- Processes for lighter plastic parts
- Processes producing better mechanical properties
- Alternating temperature control for particularly high finish
- Flow-coated in the mold and printed with electronics
- Radical thoughts in machine technology - Bringing clear application advantages
- Adaptive control for maintaining constant high quality
- Closed loop control with an external quality control unit
- Focusing on energy consumption in the periphery
- Heat pipes for faster cycles in molds with slim cores
- Cooling problem zones with CO2
- Reduced cooling time by the back door
- Unrivalled features
- Will industry 4.0 bring good weather ?
- Fig. 1 : Plant for gassing plastic pellets in an autoclave unlike other physical foaming processe, the pellet are charged with the blowing agent beforehand
- Fig. 2 : Schematic sandwich construction with two back-molded fiber fabrics and penetrating rib structures. All part structures are-continuously formed from the core outward, instead of being molded onto an organic sheet
- Fig. 3 : The heated fiber tapes are positioned exactly in the mold before they are overmolded with a fiber-reinforced thermoplastic and given their final shape
- Fig. 4 : Multiaxial tape-laying machine : this design provides for two vacuum laying tables and up to four material feeders for a process-stable, flexible UD-tape layup
- Fig. 5 : Plant parts for inductively heated molds. With the complete system, theuser can comfortably control different temperature zones
- Fig. 6 : All four parts of the A-pillar linings are molded in the insert mold and flow-coated in the paintcavity after the mold has been turned-in a single-stage process which does not require solvent or release agent
- Fig. 7 : Mold half for thermoforming and texturing TPO film. the embossing process begins during heating by drawing the film (shown here in black) under vacuum into the IMG mold
- Fig. 8 : Back-molded film panel with decoration and printed capacitive keys. The function symbols are highlighted in black glaze, so that the keys are only visible under the right backlighting. The print layout includes a wheel, several buttons and a flextail on the side
- Fig. 9 : Screw-type injector with accumulation function : the modified geometry and continuous rotation prevent melt backflow during the injection and holding pressure phase
- Fig. 10 : Changes in injection volume, viscosity and pressure curve can influence part quality. In the worst case, as shown here, different interfering factors occur at once
- Fig. 11 : System for tht optical monitoring of caps : the quality characteristics actually measured are fed into the process control
- Fig. 12 : Automatic speed control significantly reduces the temperature-control units' share of the total amount of energy consumed by the injection molding system
- Fig. 13 : Simulation of the temperature change inside the injection mold during cyclical operation. Heat pipes permit rapid heat exchange. The heat from the melt can either be transferred completely out of the mold or into defined climatic zones in areas far from the cavity
- Fig. 14 : Schematic structure of a core cooling system using evaporable refrigerants
- Fig. 15 : The main advantage of the FDU flat die unit hot runner nozzle is the greater throughput per unit of time, as a result of which injection times can be significantly shortened without having to accept significant reductions in gating quality
- Fig. 16 : The stiff core and up to 500 soft bristles of intradental brushes can be produced by 1-component injection molding
- Fig. 17 : Before the bicycle saddle is produced in the injection mold supplied by GK Tool, the structure-reinforing laminates, cut to size, are heated in an IR oven from Krelus |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31372 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 10 (10/2018) . - p. 6-18
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