TERMIUM Plus®

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MOLDED SCREW [4 records]

Record 1 1998-08-31

English

Subject field(s)
  • Plastics Manufacturing
CONT

After the parison is extruded, the screw moves backward, accumulating melt in front of its tip. When the previously molded bottle has cooled the mold opens, the bottle is removed and the screw quickly moves forward, pushing plastic melt through the extrusion head and thereby forming the next parison.

PHR

Foamable melt.

French

Domaine(s)
  • Plasturgie
PHR

Matière fondue expansible.

Spanish

Campo(s) temático(s)
  • Fabricación de plásticos
Save record 1

Record 2 1998-08-31

English

Subject field(s)
  • Plastics Manufacturing
DEF

Special screw injection process for moulding thick-walled articles, developed by Anker and Eckert und Ziegler.

CONT

Intrusion molding. When heavy sections are molded or when the shooting capacity of the machine is not adequate, intrusion molding can be used, where the screw turns continually and fills the cavity directly. When the cavity is filled, a cushion is extruded in front of the plunger, which then comes forward to supply the needed injection pressure.

French

Domaine(s)
  • Plasturgie
CONT

Intrusion. But : fabriquer des pièces très épaisses, pour lesquelles la capacité de plastification de la machine est trop faible. Principe : Le dispositif de plastification extrude la matière dans le moule et le remplit. La compression de la matière peut se faire de 2 manières : -Par la pression d'extrusion de la machine (utilisation d'une extrudeuse, ou blocage du recul de la vis d'une presse d'injection). -Par la pression d'injection de la presse. Dans ce cas, la machine plastifie de la matière jusqu'à un dosage voulu. Ensuite, injection de la matière, comme dans le cas d'une injection classique.

Spanish

Campo(s) temático(s)
  • Fabricación de plásticos
Save record 2

Record 3 1998-02-02

English

Subject field(s)
  • Plastics Manufacturing
CONT

Thermoset molding. Thermosetting materials can be molded on reciprocating screw machines. The screw is designed differently and the barrel is usually heated with hot water. When thermosets are molded, the heating cylinder provides just enough heat to start exothermic cross-linking chemical reactions between the two monomers. The material must be transferred quickly into the mold and cannot be permitted to cool in the cylinder. If it does, the screw has to be removed and the thermosetting material chipped out.

French

Domaine(s)
  • Plasturgie

Spanish

Save record 3

Record 4 1997-11-17

English

Subject field(s)
  • Plastics Manufacturing
CONT

The [intermittent extrusion] process has three subcategories : the reciprocating screw method, the ram accumulator method, and the accumulator head method. The reciprocating screw method is normally used for bottles between 250 mL and 10 L in volume. After the parison is extruded, the screw moves backward, accumulating melt in front of its tip. When the previously molded bottle has cooled the mold opens, the bottle is removed and the screw quickly moves forward, pushing plastic melt through the extrusion head and thereby forming the next parison.

French

Domaine(s)
  • Plasturgie

Spanish

Save record 4

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