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The technology we use

As a 3D-printing service Materflow is pioneer in technology. In our facilities we use the state of the art SLS-technology

SLS – selective laser sintering

Materflow uses Selective Laser Sintering. With the technology we can manufacture thermoplastics on an industrial scale. With SLS-technology the parts are built by spreading thin layers of plastic powder and melting the desired shape with laser. The result is a powder cake which contains the sintered parts. After sintering the parts are cleaned from the powder and are shot blasted to achieve the end result.

Typical applications

The polyamide we provide can be utilized in many different applications. Typical applications include structurally complex parts, functional models, small series production and concept models. The technology we use offers great freedom in design compared to traditional methods.

Material and characteristics

PA2200 is a fine-powder on the basis of polyamide 12. In comparison to standard polyamide 12 PA2200 is characterized by higher cristallinity and higher melting point as result of specific production process. PA2200 contains stabilizers against heat and oxidation.

Mechanical Properties of sintered parts Measurement method DIN/ISO Unit Value
Density EOS-Method g/cm³ 0,90 – 0,95
Tensile modulus DIN EN ISO 527 MPa 1700 ± 150
Tensile strength DIN EN ISO 527 MPa 45 ± 3
Elongation at break DIN EN ISO 527 % 20 ± 5
Flexural modulus DIN EN ISO 178 MPa 1240 ± 130
Charpy-Impact strength DIN EN ISO 179 kJ/m² 53 ± 3,8
Charpy-Notched impact strength DIN EN ISO 179 kJ/m² 4,8 ± 0,3
Izod-Notched impact strength DIN EN ISO 180 kJ/m² 32,8 ± 3,4
Izod-Notched impact strength DIN EN ISO 180 kJ/m² 4,4 ± 0,4
Ball indentation hardness DIN EN ISO 2039 MPa 77,6 ± 2
Shore-D-hardness DIN 53505   75 ± 2
Vicat softening temperature
B/50
A/50
DIN EN ISO 306

°C
°C

163
181

Thermal conductivity
vertical to sintered layers
parallel to sintered layers
DIN 52616 W/mK
W/mK
0,144
0,127
Ignition temperature DIN 51794 °C > 350

In general Polyamid12–parts show high mechanical strength and elasticity under steady stress in a temperature range from - 40°C till + 80°C. Short time loading of PA12-parts without stress is possible up to 160°C. PA12 is characterized by a low coefficient of friction and by very good abrasion resistance.

Recommended General design guidelines

Typical accuracy: ± 0,25mm + ± 0,1mm/100mm 

Max size: 330 x 330 x 600 mm

Smallest wall thickness: 0.7 – 1 mm

Smallest detail 0.3 mm

Clearance between parts: 0.5 mm

 

Wall thickness

Recommended wall thickness for manufactured parts: 0.7–1 mm. smaller structures can be too fragile that they may not survive the post-processing. After production the parts are cleaned and shot blasted to clear excessive powder.

 

 

 

 

Clearance

When manufacturing complicated functional structures, like joints, it is recommended to use clearance of 0.5 mm. During manufacturing of the object, the powder remains between the parts as a support and it has to be removed during post-processing. If the clearance is too small, the powder compresses and may possibly melt, resulting in difficulties on separating the parts. When designing complex net-like structures it is also recommended to use the same values to avoid melting and achieve successful post-processing.

 

 

 

Engravings and embossed patterns

For engravings and embossed patterns it is recommended to use a line thickness of 0.8 mm and enough height so all the shapes show clearly. The layer thickness we use in producing parts is 0.1 mm which means that you need at least 0.2 mm for a detail to show at all. It is recommended that the details are +1 mm tall so they stand out clearly.

 

 

 

 

Warping

It is typical for big thin areas to warp during the cooling process. This effect is not avoidable. The only solution is not to have big thin areas. A4-like thin objects are not recommended for printing if warping is a problem for the end-use of the product. In some cases we can minimize the effect with post treatment but that is not always possible due part geometry.