Toothpaste cap 1

Toothpaste cap 1

2 month ago

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Zhejiang Ceeto Mold Co.,Ltd.

 7 year year

Product details

How is plastic injection molded toothpaste cap produced?

The production of plastic injection moulded toothpaste caps is mainly achieved through the injection moulding process, the core of which is the injection of high-temperature molten plastic into precision moulds, which are cooled and moulded to obtain complex structural and hermetic caps. The following are the detailed production steps and technical points:

1. Material selection

- Commonly used plastics:

- Polypropylene (PP): chemical-resistant, abrasion-resistant, suitable for multiple opening and closing.

- High density polyethylene (HDPE): low cost, good flexibility.

- Special requirements: masterbatch (colour) or antioxidant (to extend life) can be added.

2. Mould design and manufacture

- Mould structure:

- Cavity: designed according to the shape of the lid (round/square, threaded structure).

- Thread forming: internal or external threads need to be accurately machined inside the mould (to match the pipe opening).

- Sealing structure: Flange or sealing ring groove is designed on the inside of the cap (to prevent toothpaste leakage).

- De-moulding angle: Ensure the cap is smoothly de-moulded after cooling to avoid deformation.

- Thimble system: Eject the moulded cap to avoid surface damage.

3. Injection moulding process

1. Plastic melting:

- Plastic granules are fed into the heating cylinder through the hopper of the injection moulding machine and heated to the molten state (PP: 200-280°C, HDPE: 180-260°C).

2. Injection mould filling:

- Molten plastic is injected into the closed mould cavity under high pressure (50-150 MPa) to fill the threads and seal the structure.

3. Holding Pressure Cooling:

- Holding pressure compensates for plastic shrinkage and cooling time is set according to thickness (usually 10-30 seconds).

4. demoulding:

- The mould opens, the ejector system pushes out the moulded cap and the robot or manually removes it.

4. Post-processing and inspection

- Deburring: Trimming the burrs left in the injection port (manual or automated deburring machine).

- Thread checking: Make sure the threads match the orifice and screw smoothly.

- Sealing test: randomly check whether the sealing ring of the cap fits with the orifice to prevent leakage (e.g. pressurised test).

- Dimensional testing: Calipers or CMM to check critical dimensions (diameter, height, etc.).

5. Special process optimisation

- Two-colour injection moulding: Produce two-colour caps (e.g. outer hard PP + inner soft rubber sealing ring).

- In-mould labelling (IML): Embed labels during injection moulding to enhance the appearance and texture.

- Automated production: with robot and conveyor belt for high speed continuous injection moulding (thousands per hour).

6. Application and assembly

- Matching with tube body: the cap is fixed to the tube mouth by ultrasonic welding or thread screwing.

- Personalised design: different colours, textures (frosted/glossy) or child-resistant opening structures are achieved through mould adjustments.

Key quality requirements

1. Sealing: prevent toothpaste from drying out or leaking.

2. Durability: no damage after repeated opening and closing for more than 500 times.

3. Appearance: no shrink marks, bubbles or flying edges.

Through precision moulds and parameter control, injection-moulded toothpaste caps can be efficiently and cost-effectively mass-produced while meeting functional and aesthetic requirements.

Plastic injection mold is widely used in many industries, such as: automotive, home appliances, daily commodity, medical consumables, home and garden tools, Light housing, electronic components, beauty and personal care, toys.

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Zhejiang Ceeto Mold Co.,Ltd.

 Audited supplier

7 year

Address: Ningbo, China

Main Product: Plastic Injection Mold, Plastic Molding , Daily consumer plastic molds, automotive plastic molds, lighting cover plastic molds, home appliance plastic molds

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