Making plastic parts

Making plastic parts

There are lots of solution to make plastic parts as following:

Prototype making process to make plastic parts, there are plastic molding,  CNC machining, plastic casting, SLA  and SLS process

To use plastic injeciton molding process to make plastic parts, before plastic molding you should make plastic molds.

Also there are thermoforming and blow molding process etc to make plastic parts.  Based on your plastic parts structure, needed quantities, function of plastic parts and plastic parts material, you can choose the most reasonable and reliable psolution. Sure we can handle this job. More information about us, please kindly review Seasky Tooling Group Profile.

Making plastic parts

SLA rapid prototype

SLA rapid prototype making

The introduction of SLA laser rapid prototype materials

SPR 5000 SLA rapid prototype material: it is a kind of solid material which has the durable, good intensity, good toughness and waterproof performance.

Similar ABS SLA rapid prototype material:

American DSM 14120, which has favorable intensity and toughness, waterproof performance and it can resistant 50-degree high temperature

Transparent SLA prototype material:

American DSM 11120, which is a kind of SLA  prototype material, has the durable and waterproof performance.
High temperature resistance: American DSM 12910, which is a kind of SLA prototype material, has the durable performance and it can resistant 130-degree high temperature

SLA rapid prototype

PBT molding

PBT

Generic Class

PBT (Polybutylene Terephthalates)

Typical Applications

Household appliances (food processor blades, vacuum cleaner parts, fans, hair dryer housings, coffee makers, etc.), electronics (switches, motor housings, fuse cases, key caps for computer keyboards, connectors, fiber optic buffer tubing, etc.), automotive (grilles, body panels, wheel covers, and components for doors and windows, etc.)

PBT Injection Molding Processing Conditions　

PBT Drying

This material is sensitive to hydrolysis at high temperatures. It is therefore important to dry the material prior to molding. Suggested drying conditions (in air) are 120 C (248 F) for 6 – 8 hours (or 150 C (300 F) for 2 – 4 hours). Moisture levels must be below 0.03%. When using a desiccant dryer, drying at 120 C (248 F) for 2.5 hours is recommended.

PBT Melt Temperature

220 – 280 C (428 – 536 F); aim: 250 C (482 F)

PBT Injection Mold Temperature

40 – 60 C (104 – 140 F) for unreinforced grades. For other grades, a wide range of temperatures can be used, depending on the grade (15 – 80 C / 59 – 176 F). Cooling channels should be properly designed to minimize part warpage. The heat removal must be fast and uniform. Cooling channels of 12 mm diameter are recommended.

PBT Resin Injection Pressure

Moderate (up to maximum of 1500 bar / 21750 psi).

PBT Injection Speed

Fastest possible speeds should be used (due to fast solidification of PBTs)

PBT Molding Runners and Gates

Full round runners are recommended to impart maximum pressure transmission (rule of thumb: runner diameter = part thickness + 1.5 mm). A wide variety of gates may be used. Hot runners may also be used, taking care to avoid drool and material degradation. Gate diameters or depths should preferably be between 0.8 – 1.0 times the part thickness. When using submarine gates, the minimum recommended diameter is 0.75 mm.

PBT Chemical and Physical Properties

PBT is one of the toughest engineering thermoplastics. It is a semicrystalline resin and has excellent chemical resistance, mechanical strength, electrical properties (high dielectric strength and insulation resistance), and heat resistance, all of which are stable over a broad range of environmental conditions. It has very low moisture absorption.

PBT, which is a polyester, is produced by the polycondensation reaction of dimethyl terephthalate an butanediol.

Tensile strength ranges from 50 MPa (7,250 psi) for unfilled grades to 170 MPa (24,650 psi) for glass reinforced grades. High levels of glass fillers make the material more brittle. Crystallization is rapid and this could cause warpage due to non-uniform cooling. In the case of glass filled grades, shrinkage is reduced in the flow direction, but in the cross-flow direction it may be equal to that of the base resin. Shrinkage is of the order of 0.015 – 0.028 mm/mm (1.5 -2.8%). A 30% glass-filled resin has a shrinkage range of 0.3 – 1.6%. The melting point (approximately 225 C / 437 F) and heat distortion temperatures are lower than that of PET. The Vicat softening point is approximately 170 C (338 F). The glass transition temperature ranges from 22 – 43 C (71 – 109 F).

The melt viscosity is fairly low and due to fast crystallization rates, cycle times are typically low.

PBT Major Manufacturers

BASF (Ultradur), Ticona (Celanex), GE Plastics (Lomod, Valox), Bayer (Pocan), Huls (Vestoduv), Mitsubishi Engineering Plastics (Novadur), Teijin Chemicals.

PBT molding

SLA prototype

SLA prototype

SLA rapid prototyping is a discrete layered, layer by layer stacking technology, the direct use of three-dimensional computer data is implemented as a prototype of the product, the more mature laser technology both SLA and SLS rapid prototyping, which the SLA the main material for the photosensitive resin.
 

SLA’s advantages:

A smooth surface, and good quality.
Forming high precision, and accuracy of 0.1mm;
Can be made very fine details and molding of thin-walled structures, high precision, easy post-processing.
 Processing cycle is short, usually it is three days.

The disadvantage of SLA:

1 selectable types of materials is limited, and must be a photosensitive resin.
2 processing strength of the material is a bit weak, can not be repeated disassembly and hit the screw.

SLA prototype