How to Remove Scale from Mold Channels Without Removing the Mold

Scale buildup and blockage are common problems in mold cooling channels, particularly where circulating-water systems operate continuously for long periods. Calcium and magnesium ions in circulating water can precipitate and form hard mineral scale. Rust particles, production dust, water impurities, and other contaminants can also accumulate inside mold channels.

Over time, these deposits can cause mold channels to become narrower, partially blocked, or locally completely blocked. Deposits on the internal channel walls can also create an insulating layer that reduces mold heat-transfer efficiency.

DOUBLE EASY's Mold Channel Cleaning Machine is designed to remove internal deposits while allowing the mold to remain assembled during cleaning. The machine supports cleaning without mold disassembly and without stopping production.

Why Does Scale Build Up Inside Mold Channels?

Several materials can accumulate inside mold cooling channels:

1. Mineral scale formed from calcium and magnesium ions

2. Rust particles

3. Production dust

4. Water impurities

5. Other contaminants

As these deposits accumulate, the internal channels can become increasingly restricted. In some areas, blockage can become severe enough to create localized complete obstruction.

This is a common problem in injection-molding environments where circulating-water systems operate for long periods.

What Happens When Mold Channels Become Blocked?

Blocked mold channels can affect cooling performance.

Blockage can cause different areas of a mold to cool at different rates, producing:

1. Localized hot spots

2. Excessive temperature differences

For injection-molded products, possible defects include:

1. Shrinkage

2. Sink marks

3. Bubbles

4. Warpage

5. Color variation

6. Cracking

For die-cast products, possible defects include:

1. Porosity

2. Cold shuts

3. Cracking

4. Shrinkage porosity

These defects can increase scrap, rework, and production costs.

Blocked Mold Channels Can Also Extend Production Cycles

When mold cooling performance deteriorates, manufacturers may need to extend cooling time and slow the production cycle.

Longer cycle times reduce production output under the same machine and working-hour conditions.

Reduced heat-transfer efficiency can also increase the operating load of chillers and mold temperature controllers, increasing electricity consumption and operating costs.

Mold Scale and Corrosion Can Affect Mold Life

Scale, corrosion, and localized overheating can contribute to:

1. Thermal fatigue

2. Surface cracking

3. Cooling-channel perforation

4. Major mold repairs

5. Mold scrapping

Premature mold deterioration can increase fixed-asset costs.

Without routine mold-channel maintenance, blockage may only be addressed after product defects or production abnormalities appear. Unexpected shutdowns and mold failures can interrupt production, delay deliveries, and cause order losses.

Can Mold Channels Be Cleaned Without Disassembling the Mold?

Yes. The Mold Channel Cleaning Machine supports cleaning without mold disassembly and without stopping production.

This practical guide explains how to clean mold water channels and where machine-based circulation fits into the maintenance process.

The Mold Channel Cleaning Machine supports cleaning:

1. Without mold disassembly

2. Without stopping production

The mold does not need to be dismantled, and cleaning can be performed without interrupting factory production schedules.

The system is designed to reduce the time and production losses associated with traditional mold disassembly and cleaning.

How DOUBLE EASY DBHM Cleaning Technology Works

DOUBLE EASY's Mold Channel Cleaning Machine uses the company's independently developed DBHM Air-Water Hybrid Air-Blast Pulse Technology.

The available mold channel cleaning machines for online cleaning provide model information for this non-disassembly process.

The technology mixes high-speed water flow with high-pressure compressed air to generate high-frequency air-blast shock waves for removing deposits from mold channels.

Unlike conventional pulse systems that rely only on water flow, DBHM uses combined air-water pulse action to strip scale from internal channel walls.

The process is designed to remove:

1. Stubborn mineral scale

2. Thick rust deposits

3. Hardened biological deposits

4. Deposits in hard-to-reach areas

The pulse-blast function is also used to strip scale and rust from internal channel walls.

DOUBLE EASY states that the scale-removal rate can reach more than 99%.

What Types of Mold Channels Is DBHM Designed to Clean?

The Mold Channel Cleaning Machine is designed for:

1. Curved channels

2. Blind channels

3. Long narrow channels

4. Deep-hole channels

5. Multiple parallel cooling circuits

6. Complex mold-channel configurations

These channel types are supported applications for the DBHM cleaning process.

Intelligent Variable-Frequency Adaptive Cleaning

The equipment incorporates an intelligent variable-frequency control system.

The system is designed to automatically identify:

1. Mold-channel diameter

2. Blockage severity

3. Deposit type

The equipment can then dynamically adjust pulse frequency and water-pressure intensity without repeated manual adjustment.

Cleaning parameters can be adaptively matched to:

1. Thin-wall precision molds

2. High-pressure die-casting molds

3. Large multi-circuit molds

The system is designed to avoid excessive pressure impact, channel deformation, and corrosion damage. It is also intended for high-precision applications including medical, new-energy, and optical molds.

One-Way and Two-Way Mold Channel Cleaning

The Mold Channel Cleaning Machine supports both one-way and two-way cleaning.

One-way cleaning performs cleaning in a single direction.

Two-way cleaning performs forward and reverse cleaning through the mold channel.

During two-way cleaning, pulse cleaning is performed in both forward and reverse directions.

The pulse-cleaning system also allows operators to adjust:

1. Pulse start duration

2. Pulse stop duration

3. System air pressure

4. Cleaning water pressure

Flow-Rate Monitoring Before and After Cleaning

Applicable machine configurations use a KEYENCE ultrasonic flowmeter to measure water flow.

The operating interface displays the current system flow rate, and cleaning records can display changes in mold-channel flow rate before and after cleaning.

The machine also provides an individual-channel Flow Test function.

Operators can:

1. Select an individual channel

2. Set a target reference flow value

3. Set the test duration

4. Start flow detection

5. View real-time flow changes

6. View the detected flow value after testing

7. Receive an advisory prompt when the detected value falls below the preset reference threshold

Cleaning Records and Traceability

The equipment supports:

1. Before-and-after mold-channel flow comparison

2. Cleaning-data storage

3. Traceable maintenance records

4. MES system integration

5. Endoscopic visual inspection

These functions are intended for digital maintenance and quality-audit requirements in new-energy, medical, precision-electronics, and other high-precision manufacturing applications.

Leak and Pressure Testing Before Cleaning

Before cleaning, the machine can perform leak and pressure testing on the connected mold channel.

The test can display:

1. Normal

2. Leak

3. Blockage

The operating procedure specifies a default leak and pressure test duration of approximately 50 seconds.

The interface also includes parameters for:

1. Pressure-drop value

2. Pressure-holding time

3. System air pressure

4. Pressurization time

What Cleaning Medium Does DOUBLE EASY Use?

DOUBLE EASY uses a neutral, environmentally friendly cleaning medium with:

1. Non-corrosive characteristics

2. No heavy-metal contamination

3. Easier waste-liquid handling

4. Cleaning-solution recycling

For serious blockage or first-time cleaning after extended mold use, a dedicated solid-powder cleaning agent can be used.

The instructions state that strong-acid cleaning agents should be avoided because long-term use may damage the water tank and internal machine components. Mild citric-acid detergent is mentioned as an alternative.

The machine should use clean municipal water. The instructions prohibit the use of reclaimed water and groundwater.

How Do Traditional Mold Channel Cleaning Methods Compare?

Manual, Needle and High-Pressure Water-Gun Cleaning

Manual, needle, and high-pressure water-gun cleaning require no equipment investment and have a low individual cleaning cost.

The listed limitations are:

1. Mainly removes contamination near mold-channel openings

2. Cannot effectively remove deep scale or sludge

3. Can damage thin-wall channels

4. Requires longer shutdown time

5. High labor cost

6. Inconsistent cleaning results

7. Difficult to standardize

Acid-Based Chemical Cleaning

Acid-based cleaning provides fast descaling and some effectiveness against hard mineral scale.

Its listed limitations include:

1. Corrosion of internal metal surfaces

2. Mold thinning and premature aging

3. Potential micro-cracking

4. Polluted wastewater

5. Environmental compliance risks

6. Secondary oxidation and rust formation

Ultrasonic Cleaning

Ultrasonic cleaning is suitable for mold-surface oil, mold-release agents, and surface rust.

For internal cooling-channel maintenance, limitations include:

1. Cannot effectively access deep enclosed mold channels

2. Limited effectiveness in curved, irregular, long, narrow internal passages

3. Cannot replace dedicated Mold Channel Cleaning Machines for internal cooling-channel maintenance

Conventional Pulse Cleaning Machines

Conventional pulse cleaning offers the following advantages:

1. No mold disassembly

2. Physical cleaning

3. Non-corrosive

4. Suitable for many conventional molds

It also identifies limitations including:

1. Unstable pressure

2. No intelligent variable-frequency adjustment

3. No flow-data monitoring

4. Limited cleaning-result traceability

5. Lower corrosion resistance

6. Higher consumable usage

7. Limited maintenance-support systems

From Reactive Repair to Preventive Mold-Channel Maintenance

Mold-channel maintenance is shifting from repairing channels only after defects or complete blockage occur toward routine preventive cleaning.

It also states that periodic cleaning is increasingly being incorporated into standardized mold-maintenance programs.

Regular mold-channel cleaning can help reduce risks including:

1. Corrosion

2. Thermal cracking

3. Channel perforation

4. Premature aging

5. Major repairs

6. Mold replacement

FAQ

Can a DOUBLE EASY Mold Channel Cleaning Machine clean without mold disassembly?

Yes. The machine supports cleaning without mold disassembly and without stopping production.

What deposits is DBHM designed to remove?

DBHM is designed to remove stubborn mineral scale, thick rust deposits, hardened biological deposits, and deposits in hard-to-reach areas.

Can the machine clean long or curved mold channels?

Yes. The system is designed for curved, blind, long narrow, deep-hole, multiple-parallel, and complex mold-channel configurations.

Can the cleaning result be compared before and after cleaning?

Applicable configurations support flow-rate monitoring and before-and-after mold-channel flow comparison.

Does DOUBLE EASY recommend strong-acid cleaning agents?

No. Strong-acid cleaning agents should be avoided because long-term use may damage the water tank and internal machine components.

Related Product and Application Resources

Explore Mold waterway cleaning solutions and application resources.

Before selecting a method, compare the sample against this guide to identify likely scale, rust, or sludge in mold cooling channels.