CNC Machining

Shenzhen City

Office Hour 09:00am - 06:00pm

ISO 9001:2015

Certified Company

Do injection molds need to be cleaned?

Home – Blog

injection mold

If the injection mold is too clean, what will be the harm? You will learn after reading this article.

a: Perform the necessary cleaning of the mold during the established production cycle

Every time the mold is removed from the press, the mold pores must be opened first to remove all oxidizing dirt and rust in non-critical areas of the mold and template. This prevents it from slowly corroding the surface and edges of the steel. In many cases, even after cleaning, some uncoated or rust-prone mold surfaces will soon rust again. Therefore, even if it takes a long time to brush the unprotected mold. But surface rust can not be completely avoided.

b: After the molding process is completed, the residue is usually left on the mold

For different kinds of residues, the cleaning requirements will be different. For example, resins such as polyvinyl chloride produce hydrogen chloride gas, which corrodes many types of die steel. Other residues are separated from flame retardants and antioxidants but cause corrosion to the steel. Some pigments rust the steel, and the rust is difficult to remove. Even ordinary sealed water, if placed on the untreated mold surface for too long, will also cause damage to the mold.

c: Many molds come with self-cleaning vent lines.

These pipes have a high gloss. The air vent is cleaned and polished to the level of SPI #A3. Alternatively, by milling or grinding, the residue is discharged into the garbage area of the ventilation line to prevent the residue from adhering to the surface of the roughing mill stand. However, if the operator uses coarser scrubbing pads, emery cloth, sandpaper, grinding stones, or brushes with nylon bristles, brass, or steel to manually grind the mold, it will cause excessive cleaning of the mold.

d: Standardize the use of abrasive agents

In general, when hard plastics, glass beads, walnut shells, and aluminum pellets are used as abrasive agents for high-pressure crushing and cleaning of the mold surface if these abrasive agents are used too frequently or are used improperly, this grinding method will also cause pores on the mold surface and easy residue adhesion to it. Lead to more residue, wear, or lead to premature mold fracture or burr, and other phenomena, but more conducive to the cleaning of the mold.

To effectively reduce the wear of the mold, we should find cleaning equipment suitable for the mold and processing technology.

Latest News

Subscribe for expert design and manufacturing tips delivered to your inbox.​

Subscribe For Newsletter!

Our Services

This text briefly introduces visitors to your main services.
injection molding

Injection Molding

Our injection molding factory churns out hundreds of injection molding parts on demand. We use premium quality materials for every project.

injection molds design

Mold Design

Custom injection molding service for the manufacturing of competitive pricing, high-quality plastic prototyping and production parts in a fast lead time.

CNC Machining

CNC Machining

CNC machines are very precise and have large tolerances. This service is ideal for prototyping and producing metal, resin and other parts.

CNC Machining

Surface Finishing

High-quality surface finishing services can improve the appearance and functionality of your parts, providing quality metal, composite and plastic surface treatment services.

Reduce Production Costs and Get the Latest Prices Now!

Click or drag files to this area to upload. You can upload up to 5 files.
(Upload format: 3D. CAD. STP. STEP. X_T, and Max File Size 50MB, If it is not enough, please send it to email:

Table of Contents