- 産業: Software
- Number of terms: 1241
- Number of blossaries: 0
- Company Profile:
Moldflow develops plastic injection molding software.
Cracking is the formation of a narrow separation in a plastic component, usually by the rupture of chemical bonds due to internal and external stress.
Industry:Software
Crystalline polymers are a family of polymers that are characterized by an ordered arrangement of the molecules which fit closely together. Typically, crystalline polymers are more dense than amorphous polymers. A polymer in a crystalline state is a solid, due to its solid crystals, which have definite geometric form.
Crystalline polymers display an X-ray diffraction pattern. The degree of crystallinity determines the intensity of the pattern. The pattern can be used to identify the polymer.
See also Amorphous Polymers.
Industry:Software
Crystallinity is a solid, molecular state of some polymers which denotes compactness of the molecular chains. This characteristic is attributable to the existence of solid crystals with definite geometric form.
Industry:Software
During cooling some polymers form an ordered molecular structure which are called crystals. The rate of crystallization is a function of both temperature and time. The level of crystallinity achieved is determined by cooling rates. Rapid cooling rates are associated with lower levels of crystalline content and vice versa. The level of volumetric contraction (shrinkage) is also affected by degrees of crystallinity, with higher crystallinity resulting in greater shrinkage.
In injected molded parts, thick regions tend to cool slowly relative to thinner sections, and so have higher crystalline content and hence higher volumetric contraction.
Industry:Software
Cure is a stage reached by a thermosetting material that is sufficiently cross-linked to form a solid; the cross linking is the result of a chemical reaction.
Sometimes this term is used to describe the solidification of thermoplastics; this is a physical process of removing heat from the thermoplastic.
Industry:Software
A line in three-dimensional space. A curve can be straight or contain bends.
This includes:
*Line - a straight curve defined by two end points
*Arc - a section of a circular curve defined by one of two methods:
**Three points on a plane
**A center point and arc and angle
*Spline - a cubic spline interpolation. on a supplied set of points.
Industry:Software
Cycle time is the time from the ejection of one part to the ejection of the next part. Cycle time is the sum of:
*Filling time
*Packing time
*Cooling time
*Mold open time.
Industry:Software
Decompression is the movement of the screw away from the nozzle (without rotation) and is used to prevent drooling. Decompression may be used for low viscosity materials (for example, PA-66), where the nozzle does not have a valve gate to prevent drooling.
Industry:Software
Delamination is a localized separation of the surface of the part. The most common cause of delamination is excessive injection velocity.
Industry:Software
