3 - Cavity filling instability, rheology, shear stress, accuracy of Moldflow results, uneven cavity filling - Smartplast

Contact

+420 725 764 813 olga@smartplast.cz

Company address

SMARTPLAST s.r.o.
B. Němcové 351
760 01 Zlín

Company ID: 28290330
VAT ID: CZ28290330

We are members of professional clusters

Plastikářšký klastr

AUTOKLASTR

Contact

+420 725 764 813 olga@smartplast.cz

Company address

SMARTPLAST s.r.o.
B. Němcové 351
760 01 Zlín

Company ID: 28290330
VAT ID: CZ28290330

We are members of professional clusters

Plastikářšký klastr

AUTOKLASTR

3 – Cavity filling instability, rheology, shear stress, accuracy of Moldflow results, uneven cavity filling

3 – Cavity filling instability, rheology, shear stress, accuracy of Moldflow results, uneven cavity filling

Domů / 3 – Cavity filling instability, rheology, shear stress, accuracy of Moldflow results, uneven cavity filling

Presenter

Ing. Petr Halaška
Smartplast s.r.o.

How accurate are Moldflow analysis results? The results are only as accurate as the input data. In this webinar, the data are rheological. We will discuss how measuring flow properties affects the accuracy of cavity filling analysis.
We will show an analysis of shear stress on the part wall and how it impacts the part’s durability. Similarly, we will examine shear rate, identifying critical points for its exceedance during the injection process. How to analyze polymer damage caused by shear stress will also be covered.
Very often, injection-molded parts have thin walls that are difficult to fill. We will demonstrate the influence of cavity pressure on their filling.
Cores in the mold can deform due to melt pressure during filling. We will answer how to analyze deformation and changes in wall thickness.
Finally, we will describe the jetting effect (free flow), how it arises, and how to eliminate this phenomenon.
This webinar is also suitable for users of analytical software other than Moldflow.

Webinar recording

Program

Rheological properties of plastics – temperature, velocity, pressure, wall slip

What does the accuracy of Moldflow cavity filling analysis depend on?

Shear stress on the wall, how it affects the lifecycle of the injection-molded part

Shear rate, critical points in the injection molding process

How to analyze polymer damaged by high shear rate?

Uneven filling of varying wall thicknesses in the cavity

How does air pressure in the cavity affect uneven filling?

Change in cavity wall thickness due to elastic deformation of the core

Formation, elimination, and analysis of the Moldflow jetting effect

Webinar

3 – Cavity filling instability, rheology, shear stress, accuracy of Moldflow results, uneven cavity filling

Presenter

Ing. Petr Halaška

Other webinars

1 – Injection instability – Rheology, plasticization, homogeneity, degradation, streaks

In this webinar, we will discuss how plasticization affects the quality of the injection-molded part and what visible defects may occur as a result.

2 – Injection instability during cavity filling: orientation, cold welds, trapped air

In this section, we will focus on injection instabilities that arise during the cavity filling phase, which stem from the nature of the plastic melt.

4 – Cavity filling instability – unbalanced cavity filling – gating system balancing – Melt Flipper

Very often, injection-molded parts have thin walls that are difficult to fill. We will demonstrate the influence of cavity pressure on their filling.

5 – Injection inhomogeneities during packing – shrinkage, anisotropy, tolerance

Sink marks are visible defects on the surfaces of injection-molded parts. A more severe stage are voids, unwanted cavities within the walls of injection-molded parts.

6 – Injection inhomogeneities during packing, sink marks, voids, air bubbles

Sink marks are visible surface defects on injection-molded parts. A more advanced issue are voids—undesirable cavities within the walls of injection-molded parts.

7 – Requirements for accuracy level and tolerances of injection-molded parts, DIN 16742:2013 and ISO 20457:2018

This webinar follows webinar No. 6 Injection inhomogeneities during packing – shrinkage, anisotropy, tolerance.

8 – Cooling – part design – mold construction – mold maintenance

The cost of plastic and cooling time can account for more than 70% of the part production costs.

9 – Design conflicts between part and mold, how to further optimize cooling

The cost of plastic and cooling time can make up more than 70% of the production costs of a part.

10 – What is residual stress, causes of its formation

Residual stresses are mechanical stresses that develop in the injection-molded part during the individual phases of the injection molding cycle.

11 – Effect of residual stress on deformation and part quality

Residual stresses are mechanical, residual stresses generated in the injection-molded part during manufacturing.

12 – Reduction of residual stress effects – part design, mold construction, machine settings

Residual stresses are mechanical, residual stresses generated by internal forces in the injection-molded part during the injection molding cycle.

13 – What influences the formation of voids, analysis of the formation of voids and their removal

Shrinkage cavities are unwanted voids in the walls of injection-molded parts. They affect the appearance of the part as well as its mechanical properties.

14 – Uneven filling of injection mold cavities and how to adjust the filling

Uneven filling of a cavity or cavities in injection molds is a phenomenon that everyone involved in injection molding technology has certainly encountered.

15 – Influence of part design and mold construction on cooling time

The cost of plastic and cooling time often make up more than 70% of the cost of manufacturing a part.

16 – Formation of residual stresses during injection molding and their effects

Residual stresses are mechanical stresses that develop in an injection-molded part due to internal forces. They are generated mainly during the injection molding cycle. These stresses remain embedded in the molded part even after ejection from the mold cavity.

17 – How to reduce residual stresses in an injection-molded part

Residual stresses are mechanical stresses that develop in an injection-molded part due to internal forces.