In Mould Labelling (IML): Process, Applications and Benefits

In mould labelling (IML) is a decoration and labelling technology used to apply pre-printed labels directly to plastic products during the moulding process. Unlike conventional labelling, where a label is attached after a product has been manufactured, IML integrates the label with the plastic product during injection moulding.

This technology is widely used for plastic packaging and containers that require high-quality graphics, consistent appearance, durability and efficient large-scale production.

For manufacturers looking for a reliable in mould labelling solution, understanding the IML process, suitable materials, applications and production requirements is essential before starting a project.

What Is In Mould Labelling?

In mould labelling, commonly abbreviated as IML, is a manufacturing process in which a pre-printed label is placed inside an injection mould before plastic is injected.

During the moulding process, the plastic material is injected into the mould and bonds with the label. The label becomes an integrated part of the finished product rather than being applied as a separate sticker after production.

The result is a plastic product with graphics, logos, product information or decorative designs integrated into its surface.

Depending on the product and production method, IML can provide:

• High-quality graphics and detailed designs
• Consistent label positioning
• Strong integration between the label and plastic product
• Good resistance to moisture and handling
• Efficient decoration for high-volume production
• A clean and professional packaging appearance

Because the label is integrated during moulding, in mould labelling can be particularly suitable for manufacturers producing large quantities of plastic packaging.

How Does In Mould Labelling Work?

The basic in mould labelling process combines label preparation, mould positioning and plastic injection moulding.

Although production equipment and parameters vary depending on the product, a typical IML process includes the following stages.

1. Label Design and Printing

The first step is preparing the artwork for the IML label.

The design may include:

• Brand logos
• Product names
• Images and graphics
• Product information
• Decorative patterns
• Barcodes and symbols
• Colours and visual elements

The label material, printing method and surface finish need to be selected according to the plastic product and its intended application.

2. Label Preparation

After printing, the labels are cut into the required shape and size.

The dimensions must correspond accurately to the mould cavity and the intended label position on the product.

For complex products, factors such as curved surfaces, corners, wall thickness and label placement need to be considered during development.

3. Label Placement Inside the Mould

The prepared label is positioned inside the injection mould.

Depending on the production system, automated equipment or robotic systems may be used to transfer and position the labels accurately.

Correct positioning is important because it affects:

• Label alignment
• Graphic position
• Product appearance
• Production consistency
• Overall quality

4. Plastic Injection Moulding

Once the label is correctly positioned, plastic resin is injected into the mould.

The heat and pressure generated during the moulding process allow the plastic and label to form an integrated structure.

The exact processing conditions depend on factors such as:

• Plastic material
• Label construction
• Product geometry
• Mould design
• Injection speed
• Temperature
• Pressure
• Cooling conditions

5. Cooling and Demoulding

After injection, the plastic product is cooled before being removed from the mould.

The finished product then contains the integrated label on its surface.

6. Quality Inspection

The final products are inspected for:

• Label positioning
• Colour consistency
• Print sharpness
• Surface appearance
• Adhesion or integration
• Dimensional accuracy
• Defects or deformation

For industrial production, inspection criteria should be defined during the sample-development stage before mass production begins.

IML printing for paint buckets

IML printing for paint buckets

IML printing for paint buckets

In Mould Labelling vs Conventional Labelling

One of the main differences between in mould labelling and conventional labelling is when the label is applied.

With conventional labelling, the plastic product is manufactured first and the label is attached afterwards.

With IML, the label is introduced into the mould before or during injection moulding and becomes integrated with the finished plastic product.

Feature	In Mould Labelling (IML)	Conventional Labelling
Label application	During moulding	After production
Product appearance	Integrated and uniform	Separate label layer
Position consistency	High when properly automated	Depends on application process
Production integration	Integrated with moulding	Additional labelling stage
Graphic possibilities	Suitable for detailed designs	Depends on label material and process
Large-volume production	Highly suitable	Also possible
Automation	Suitable for automated production	Depends on equipment

The appropriate technology depends on the product structure, production volume, required appearance, material and manufacturing process.

Key Benefits of In Mould Labelling

High-Quality Product Appearance

One of the main advantages of in mould labelling is its ability to create a clean and professional appearance.

High-resolution graphics, logos, product information and decorative elements can be incorporated into the product surface.

This makes IML suitable for packaging where visual presentation is an important part of product identity.

Consistent Label Positioning

For automated production, IML can provide consistent label positioning from one product to another.

Accurate positioning is particularly important for packaging with:

• Brand logos
• Product information
• Decorative graphics
• Multiple-colour designs
• Front and back artwork

Suitable for High-Volume Production

IML is particularly useful for industrial manufacturers producing large quantities of identical or similar plastic products.

Once the moulding and label-handling process has been properly developed, production can be integrated into a streamlined manufacturing workflow.

Durable Product Decoration

Because the label becomes integrated with the plastic product during moulding, the finished decoration can provide a different durability profile from a separately applied adhesive label.

The actual performance depends on the label construction, plastic material, printing system, product design and intended environment.

For applications requiring specific durability, testing should be carried out using the actual product and production conditions.

Supports Complex Graphics

IML can be used for detailed artwork, brand identity, images, patterns and other visual elements.

This makes the technology suitable for products where packaging appearance and brand presentation are important.

Enhancing print quality in in-mold labeling

Applications of In Mould Labelling

In mould labelling is used across various plastic packaging and product categories.

Food Packaging

IML is commonly considered for plastic food packaging such as:

• Food containers
• Plastic tubs
• Storage containers
• Yogurt and dairy containers
• Takeaway packaging
• Lids and covers

The label can display product branding, graphics, product information and other required content.

Household Products

IML can also be applied to household plastic products, including:

• Storage boxes
• Cleaning-product containers
• Household liquid bottles
• Plastic bins
• Trays
• Containers
• Kitchen accessories

The technology can help manufacturers create consistent product identification across large production runs.

Cosmetic and Personal Care Packaging

For cosmetic and personal care packaging, visual appearance is often an important consideration.

Potential applications include:

• Cosmetic containers
• Cream jars
• Personal-care packaging
• Plastic bottles
• Caps and lids

Detailed graphics and carefully controlled colour reproduction can support brand presentation.

Industrial Plastic Products

IML can also be considered for selected industrial plastic components and products requiring integrated identification or decorative graphics.

Applications may include:

• Plastic housings
• Covers
• Containers
• Equipment components
• Product identification surfaces

The suitability of IML depends on the material, geometry, mould structure and production requirements.

What Materials Can Be Used for In Mould Labelling?

The plastic material is one of the most important factors when developing an IML application.

Common plastic materials used in packaging and injection moulding include:

• PP
• PE
• PET
• HDPE
• ABS
• PS
• PVC
• PMMA

However, simply identifying the plastic as a material category is not always sufficient.

Different resin grades, additives, colours, surface finishes and processing conditions can affect the final result.

For this reason, a product sample or detailed technical information is recommended when evaluating an in mould labelling project.

What Factors Affect In Mould Labelling Quality?

A successful IML application depends on more than the label itself.

Plastic Material

Different plastics have different processing characteristics and surface properties.

The selected label and printing system should therefore be evaluated against the actual plastic material.

Product Shape

Flat, cylindrical, curved and complex surfaces may require different approaches.

Product geometry can influence:

• Label positioning
• Label deformation
• Graphic distortion
• Mould design
• Automation

Mould Design

The mould plays a critical role in IML production.

The label size, position, cavity structure and product geometry need to work together to achieve a consistent result.

Label Construction

The label material, thickness, printing technology, surface treatment and other characteristics can affect how the label performs during moulding.

Processing Conditions

Temperature, injection pressure, injection speed, cooling conditions and other production parameters can influence the final appearance and quality.

There is therefore no single universal temperature or processing setting for every in mould labelling application.

Production parameters should be established through technical testing using the actual materials, mould and product.

Common In Mould Labelling Problems

During IML development or production, several issues may occur if the label, mould and processing conditions are not properly matched.

Label Misalignment

The label may not be positioned correctly inside the mould.

Possible contributing factors include:

• Incorrect label dimensions
• Positioning problems
• Mould or fixture tolerances
• Automation issues
• Product geometry

Graphic Distortion

Images, text or logos may appear distorted when the label is affected by product shape or moulding conditions.

This is particularly important for curved or complex surfaces.

Poor Surface Appearance

The finished product may show visual defects such as uneven appearance, wrinkles or other surface inconsistencies.

These issues may be related to label construction, mould conditions, material behaviour or processing parameters.

Inconsistent Colour or Print Quality

Differences in printing, material or production conditions can affect colour consistency.

For branded packaging, colour standards and production samples should be reviewed before mass production.

Adhesion or Integration Issues

If the label and plastic material are not properly matched, the finished product may not achieve the required level of integration.

Testing with the actual resin, label and production process is therefore important.

In Mould Labelling Process at HDEcal

For manufacturers looking for an in mould labelling solution in Vietnam, HDEcal can support the project from technical consultation and sample evaluation through production preparation.

A typical development process can include:

Step 1: Submit Product Information

Customers provide information such as:

• Product sample
• Product photos
• Plastic material
• Product dimensions
• Label dimensions
• Label position
• Quantity
• Artwork or logo
• Required durability
• Intended application environment

Providing an actual product sample is particularly useful when the product geometry or surface characteristics cannot be fully evaluated from photographs.

Step 2: Technical Evaluation

HDEcal reviews the product structure, material, surface and decoration requirements.

This stage helps determine the appropriate labelling and printing approach.

Step 3: Label and Artwork Development

The artwork is prepared according to the required dimensions, printing specifications and product structure.

Step 4: Sample Production

A sample is developed for technical evaluation.

The sample allows the customer and production team to assess:

• Appearance
• Positioning
• Graphic quality
• Surface finish
• Product compatibility

Step 5: Testing and Approval

The sample is tested against the required application conditions.

Once the sample meets the agreed requirements, the project can proceed to mass production.

Step 6: Mass Production

After approval, production can be carried out according to the agreed specifications, quantity and quality requirements.

Why Sample Testing Is Important for IML

Every plastic product is different.

Even when two products are described as the same type of plastic, their resin grade, additives, colour, surface finish, shape and moulding conditions may differ.

For this reason, an in mould labelling sample test can help identify potential problems before mass production.

Testing can evaluate:

• Label compatibility
• Print quality
• Position accuracy
• Surface appearance
• Colour consistency
• Durability
• Production feasibility

For industrial projects, testing the actual product is generally more informative than evaluating the application based only on product photographs.

What Information Is Needed for an In Mould Labelling Quote?

To evaluate an IML project and prepare an appropriate quotation, manufacturers should provide as much technical information as possible.

Important information includes:

1. Plastic material
   For example: PP, PE, PET, HDPE, ABS or another resin.
2. Product dimensions
   Length, width, height, diameter, circumference or other relevant measurements.
3. Label size
   Required label width and height.
4. Label position
   Front, back, side, lid, cap or another specific location.
5. Product shape
   Flat, cylindrical, curved or complex geometry.
6. Artwork
   Logo, graphics, patterns, product information or design files.
7. Production quantity
   Estimated order volume or annual production volume.
8. Durability requirements
   Resistance to moisture, abrasion, chemicals, temperature or other environmental conditions.
9. Application environment
   Indoor, outdoor, food packaging, household use, industrial use or another application.
10. Actual product sample
    A physical sample is recommended whenever possible.

With these details, the technical team can better evaluate the appropriate solution and production requirements.

In Mould Labelling for Plastic Packaging

Plastic packaging manufacturers increasingly require decoration methods that combine product appearance, brand identity and production efficiency.

In mould labelling for plastic packaging can provide an integrated approach to decorating containers, tubs, lids and other injection-moulded products.

The technology can support packaging designs featuring:

• Brand logos
• Product images
• Multi-colour graphics
• Decorative patterns
• Product information
• Visual identification

For packaging manufacturers, the final solution should be selected according to the packaging material, moulding process, label requirements, production volume and target market.

In Mould Labelling Manufacturer in Vietnam

For businesses sourcing plastic packaging decoration or IML-related solutions in Vietnam, technical communication is an important part of the development process.

HDEcal works with customers to evaluate product samples, specifications and decoration requirements before moving toward production.

Depending on the project, support can include:

• Technical consultation
• Product and material evaluation
• Artwork preparation
• Sample development
• Testing
• Production preparation
• Mass-production support

For OEM and ODM projects, providing product samples and technical requirements at the beginning of the project can help shorten the evaluation process and reduce production risks.

Frequently Asked Questions About In Mould Labelling

What does in mould labelling mean?

In mould labelling (IML) is a process in which a pre-printed label is placed inside an injection mould and becomes integrated with a plastic product during the moulding process.

What is IML packaging?

IML packaging refers to plastic packaging products decorated using the in mould labelling process. Typical examples include containers, tubs, lids and other injection-moulded packaging.

Is in mould labelling suitable for all plastics?

Not necessarily. Suitability depends on the plastic resin, label construction, product geometry, mould design and processing conditions. Testing is recommended before mass production.

What products can use IML?

Potential applications include food containers, household packaging, cosmetic packaging, storage products, lids, tubs and selected industrial plastic products.

Is IML suitable for large production volumes?

IML can be suitable for high-volume injection moulding because label handling and moulding can be integrated into an automated production process.

Can IML support detailed graphics?

Yes. IML can be used for detailed logos, images, patterns, product information and other graphic elements, depending on the printing and label system selected.

How do I start an IML project?

Start by providing the actual product sample or detailed product information, including plastic material, dimensions, label area, artwork, production quantity and durability requirements. The technical team can then evaluate the application and develop a sample.

Get an In Mould Labelling Solution for Your Product

Choosing the right in mould labelling solution requires more than selecting a label.

The plastic material, product geometry, mould, label construction, artwork and production conditions all need to work together to achieve a consistent result.

HDEcal can support manufacturers through product evaluation, technical consultation, sample development, testing and production preparation.

If you are developing a new plastic product or looking for an in mould labelling solution in Vietnam, send us your product sample and technical requirements for evaluation.

Contact HDEcal for technical consultation, sample development and production quotation.

Contact Hyuntech Today

If you are looking for a reliable partner for In Mold Labelling solutions, Hyuntech is ready to support your business with high-quality products, competitive pricing, and expert consultation.

Contact Hyuntech now to get a customized IML solution and maximize your production efficiency.

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HYUN-TECH HOLDINGS., JSC

Office: Facility 1: Lot BT11, Eurowindow River Park Urban Area, Đông Anh, Hà Nội, Vietnam

Factory: 312 Nguyễn Văn Linh, Đường Hào, Hưng Yên

Heat Transfer Processing Workshop: Thôn Đoài, Vĩnh Thanh, Hà Nội

Hotline: 0332.837.260 – 08888.1.3333