Injection mold and plastic parts procurement process in China

With the improvement of China's mold manufacturing and injection molding, more and more

European and American companies have come to China to purchase molds and injection molded parts.

But for the first time, this process of procurement in China was somewhat difficult for you.

The next is the procurement process and manufacturing process for plastic molds and injection molded parts.

Plastic Mold procurement process

Before you contact the plastic mold supplier, you should make some preparations(AUTOCAD drawing or samples).

These preparations take time and money, but they will greatly benefit your future project development.

Firstly, you need to have an AUTOCAD drawing or a ready-made sample.

AUTOCAD drawing format we could use:

• .X_T


• .IGES


• .SLDPRT


• .STL

How to prepare sample pictures:

[ngg_images source="galleries" container_ids="7" display_type="photocrati-nextgen_basic_thumbnails" override_thumbnail_settings="0" thumbnail_width="240" thumbnail_height="160" thumbnail_crop="1" images_per_page="20" number_of_columns="0" ajax_pagination="0" show_all_in_lightbox="0" use_imagebrowser_effect="0" show_slideshow_link="1" slideshow_link_text="[Show slideshow]" order_by="sortorder" order_direction="ASC" returns="included" maximum_entity_count="500"]You can send the drawings to a few companies initially, tell them your specific requirements, and let them quote you the price.

You need let suppliers know your specific requirements clearly. Usually, your plastic mold inquiry sheet should include.

• The number of mold cavities,


• The choice of mold steel and hardness,


• The polish of the mold surface,


• Plastic material,


• Expected mold life,


• Molding cycle time,


• Hot runner,


• Cooling system requirements,


• Location of the gate,


• Location of the ejector.


• At the same time, you should also give details of your injection molding machine.

Following is demands sheet from my customer for plastic parts:

NOTES:

1. Plastic Injection Molded


2. Material: Polycarbonate, tinted to Pantone T 705-1-3Acceptable plastics:
   APEC FR1892, APEC DP1-9354, Makrolon with UL 94-V0 rating at or below 3mm
   Any other plastics must be approved in writing by Teknic prior to production.


3. Mold to be polished to SPI-A3 except where noted


4. Surfaces indicated to be SPI C-1 (rough/opaque) for light dissipation


5. Surfaces indicated to be SPI A-1 (smooth/lens) for light transmission


6. Approximate volume: 39.1 cubic centimeters


7. Approximate weight: 46.5 grams


8. Undimensioned features are per 3D file of part number 1108791 and same revision and are
   basic.


9. Surfaces must lie within the specified geometric tolerance zone at 20 degrees Celsius.


10. Maximum flash on surfaces 0.1mm


11. The material must have UL Flammability rating of 94-V0 at a 3mm thickness.


12.  All shipments to include a Certificate of Compliance including the material specification and
    flammability rating of 94-V0.


13.  Gate and ejector pin as needed inside the specified zones. See Pages 5 and 6 for zones.


14. Parts shall be free from air bubbles, inclusions, or haze when viewed with 8X magnifier.


15. Parts to have a temporary protective film to be applied to indicated surfaces to protect
    them from scratches during shipping and handling. Protective film to attach with static cling
    or adhesive. The adhesive must NOT leave any residue upon removal, similar to 3M 331T
    Blue film. Film to not damage silkscreen upon removal


16. The package as to prevent scratches to surfaces. Parts are to be packaged in boxes that weigh
    no more than 25lbs [11.3Kg] and are to be no more than 14" [35.6cm] in any dimension.


17.  Unless otherwise specified untoleranced dimensions are non-basic and default to:
    1. X.X .2
    2. X.XX: .13
    3. X.XXX: .07

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According to the complexity of the mold, the time for the mold building is usually around 30-60 days. After the first trial sample is ready, the plastic mold company will send you a sample and ask for your confirmation.

If you feel that the sample is qualified, he will continue with the next step of preparing the mold for shipment.

If the sample is not qualified, you should tell him in detail what needs to be improved. He will change the mold and re-send it to you for the check. This process continues until you finally get the right sample.

You can also request a video recording with 3 to 4 minutes for plastic mold testing

If you only need the mold, this transaction ends here.

If you still need plastic parts,  he will continue to help you make plastic parts.

After the plastic parts are completed, he will inform you to prepare for the shipment.