Injection Molding Guideline——注塑成型指南【中英文对照】

发布日期:[11-05-20 23:13:45] 浏览人次:[]

Injection Molding Guideline

1. Plastic Material

Assume the general purpose grade plastic materials to be used for our molding

In case of special grade materials, please list the material grade & brand on our tool plan

All the plastic materials for molding must be same as the materials during development stage.

In case of material shortage or cost issue, the new sourced material shall be tested and confirmed acceptable prior use.

2. Colorant

All the colorant must be conformed to heavy elements directives for both ASTM F963 & EN71.

Most of the dry pigments are hygroscopic; they must be properly sealed after use.

For the components with high color consistence, the masterbatches or pre-color plastic materials are required.

3. Regrind Material Ratio

For plastic material on structural components, no regrind is allowed

For general purpose material on non structural components, 20% maximum runner regrind can be blended with virgin material.

For those translucent or true white color components, no regrind is allowed.

For short glass filled materials, 15% maximum regrind can be blended with virgin material

For long glass filled materials, no regrind is allowed.

The maximum number of regrind passes for general purpose materials shall be 3.

Only 1 time of regrind pass is allowed for short glass reinforced materials

The regrind ratio shall be shown in our updated tool plan to follow.

The regrind ratio and no. of regrind passes has to be validated and confirmed during development stage. If not, no regrind will be allowed.

Burned or discolored sprues or parts must not be used as regrind.

Hot nozzle & hot runner is our preference to eliminate runner scrap.

4. Material Drying

Most plastic resins require thorough drying prior injection molding to assure maximum properties in the molded parts. Below table please find the recommended drying temperature & duration for reference:

For those hygroscopic materials, the dehumidifying hopper dryer with closed-loop air circulating system is required to ensure acceptable moisture content to be achieved during molding.

For those non-hygroscopic materials, the regrind have to be dried as 80ºC for 2 hours to prevent surface blemishes due to volatiles, such as PE, PP, POM, HIPS.

Material

Drying Temperature

Time required (Hour)

Dehumidifying Dryer required

ABS / C-ABS

80ºC

2

No

Nylon 6 / PPO / PC+ABS

100ºC

2

No

Nylon 66

120ºC

2

No

PU

110ºC

2 – 3

Yes

PC

120ºC

2 - 3

No

PET

120ºC

2 - 3

Yes

Regrind blench for PE / PP / HIPS / POM

80ºC

2

No

5. Screw Design

For most of un-filled plastic, standard screw with L / D ratio 22:1 is recommended

For glass reinforced plastic, screw with lower L / D ratio 20:1 is recommended

Bi-metallic screw and barrel are required for glass reinforced plastic to have higher wear assistance

6. Molding Machin

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本文所属专题:注塑成型 英文文献翻译 
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