摘要:
A travelling mold tunnel for forming double walled corrugated tube has a first portion for forming corrugated tube and a second belled portion for forming a cuff portion suitable for coupling with another tube. At the upstream end of the belled portion, radial small diameter passages are provided so that a pressure differential may be set up between the inside and the outside of a first parison within the belled portion. Thus, vacuum may be applied through the radial passages to allow an inner parison to laminate with the first parison over its inner surface in the belled portion. The first parison is drawn into the passages in protruding balloons. These may be ruptured. Alternatively, positive pressure may be used. In this case, the balloons may be ruptured inwardly.
摘要:
Disclosed is a device (10) for producing cross-finned pipes, which exhibits molding cheek halves (12) lying adjacent to each other along a common molding segment and forming a molding channel (18) in-between the latter. A stationary linear guiding device (42) is provided along the molding segment in order to guide the molding cheek halves (12). Said device exhibits an elongated central sliding body (44), preferably made of a sliding metal alloy, and two guiding oil-lubricated bodies (46) placed laterally adjacent to the sliding body (44), said bodies being made preferably of an abrasion-resistant metal.
摘要:
Eine Vorrichtung zur Herstellung von Rohren (15) aus thermoplastischem Kunststoff mit Querprofilierung weist auf einer Formstrecke (2) paarweise in Kreislauf geführte Formabschnitts-Hälften (4, 5) auf. Es ist eine Transportvorrichtung (29) zur Rückführung der Formabschnitts-Hälften (4, 5) vorgesehen, die nach Art eines Brückenkranes ausgebildet ist. Auf einer die Formstrecke (2) übergreifenden Transport-Brücke (34) sind zwei quer zur Produktionsrichtung und gegensinnig zueinander verfahrbare Transport-Wagen (44, 45) vorgesehen, an denen jeweils ein nach unten gerichteter Transportarm (53) mit einer Haltevorrichtung (54) für je eine Formabschnitts-Hälfte (4, 5) angebracht ist.
摘要:
A travelling mold tunnel (12) for the vacuum forming of profiled tube from extruded parison of molten thermoplastic material includes a plurality of parallel mold cavities (18) with a vacuum applied to each of the mold cavities.
摘要:
A travelling mold tunnel for forming double walled corrugated tube has a first portion for forming corrugated tube and a second belled portion for forming a cuff portion suitable for coupling with another tube. At the upstream end of the belled portion, radial small diameter passages are provided so that a pressure differential may be set up between the inside and the outside of a first parison within the belled portion. Thus, vacuum may be applied through the radial passages to allow an inner parison to laminate with the first parison over its inner surface in the belled portion. The first parison is drawn into the passages in protruding balloons. These may be ruptured. Alternatively, positive pressure may be used. In this case, the balloons may be ruptured inwardly.
摘要:
Method for manufacturing dental aspirators comprising an extruded plastic tube with a bellows portion (10) allowing angling of the tube and comprising a number of folds each of which consists of two cup-shaped portions which have the concave surfaces facing each other. One cup-shaped portion has a smaller width than the other one in order to be snapped completely or partly into said other cup-shaped portion. At the extrusion of several aspirators as a continuous tube length the bellows portions (10) are made by forming the wall of the tube length against chilled mould chains (15). At the same time the tube length is profiled by means of the chilled mould chains in portions (11, 19) which shall form the end portion at the suction end of the finished aspirator. The tube length is cut to finished aspirators at predetermined intervalls.