Professional Plastic Injection Molds & Manufacturing – Specialized in Refrigerator Drawer Production

 We are a specialized factory focused on plastic injection mold manufacturing and injection molding production, dedicated to providing high-precision, high-quality plastic components for the home appliance industry. With years of industry experience and advanced production technology, we have become a reliable partner in the field of refrigerator parts manufacturing, particularly excelling in the R&D and production of refrigerator drawers. We offer comprehensive solutions from mold design to mass production.

Core Advantages

Precision Mold Manufacturing

A professional mold design team utilizing CAD/CAM/CAE technology to optimize structure, ensuring mold accuracy and longevity.

Fully equipped with advanced machinery (CNC, EDM, wire-cutting, etc.), capable of producing complex injection molds tailored to various refrigerator drawer requirements.

Efficient Injection Molding

Equipped with fully automatic injection molding machines (80T-1000T), supporting materials such as PP, ABS, PS, PC, and more, meeting food-grade, low-temperature resistance, and high-toughness demands.

Strict process control ensures dimensional stability and surface finish, preventing defects like warping and shrinkage.

Specialized Refrigerator Drawer Expertise

Extensive experience in producing slide-out drawers, transparent drawers, and multi-layer storage drawers, with ergonomic designs (anti-slip textures, snap-fit structures, silent opening/closing).

Rigorous testing for low-temperature resistance (-30°C), load-bearing capacity, and drop impact, complying with home appliance safety standards.

One-Stop Service

Customization support: Material selection, structural optimization, color matching, logo engraving, and more to meet diverse needs.

Full-process quality control from mold development to mass production, accelerating time-to-market.

Quality Assurance

Strict adherence to ISO 9001 quality management system, with full inspection of mold precision, part dimensions, and functionality.

Equipped with CMM, tensile testers, and other equipment to ensure batch consistency.

Industries We Serve

We work with domestic and international refrigerator manufacturers and home appliance parts suppliers, with products widely used in household and commercial refrigeration. We also undertake orders for precision plastic parts in automotive components, daily necessities, and more.

The Role and Working Principle of Lifters in Molds

 1. Definition of a Lifter

A lifter is a common ejection mechanism in injection molds, primarily used to address demolding challenges caused by undercuts in plastic parts. It operates through an angled movement (typically driven by an angle pin or guide rail) during mold opening, allowing the part to be released smoothly without sticking or damage.  

2. Functions of Lifters 

(1) Resolving Undercut Demolding Issues  

-When a plastic part has internal recesses, side holes, or snap-fit features, standard ejector pins cannot release it directly. Lifters provide lateral movement to clear the undercut, enabling successful ejection.  

(2) Simplifying Mold Structure and Reducing Costs  

Compared to sliders or hydraulic core pulls, lifters have a simpler design, making them cost-effective for small to moderately complex undercuts.  

(3) Improving Production Efficiency  

Lifter movement is automatically controlled by mold opening/closing, eliminating the need for external power sources (e.g., hydraulics or pneumatics), making them ideal for high-speed injection molding.  

(4) Enhancing Product Aesthetics

- Lifters are usually placed on non-cosmetic surfaces (e.g., inner sides or bottoms) to avoid visible parting lines or ejection marks.  

3. Working Principle of Lifters

Lifter movement relies on mold opening, following this typical process:  

1. Mold Closing  

   - The lifter remains stationary during injection to ensure proper part formation.  

2. Mold Opening  

   - As the mold opens, the lifter is pushed by the ejector plate while being guided by an angle pin or rail, forcing it to move at an angle.  

3. Ejection Completion  

   - The lifter slides at a predetermined angle (usually 5°–25°) to clear the undercut, followed by full part ejection via ejector pins.  

Schematic: 

Mold closed → Mold opens → Lifter moves along angle pin → Clears undercut → Part ejected  

4. Common Types of Lifters  

(1) Standard Lifter  

- Driven by an angle pin, suitable for simple undercuts.  

(2) Delayed Lifter 

- Remains stationary initially, then moves at an angle later, ideal for complex undercuts or multi-stage ejection.  

(3) Hydraulic Lifter

- Powered by a hydraulic cylinder, used for long strokes or high-precision applications (less common, often replaced by sliders).  

(4) Two-Stage Lifter  

- Uses dual motion (lateral shift followed by ejection) for deep cavities or special geometries.  

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5. Key Design Considerations for Lifters

(1) Angle Selection 

- The lifter angle (typically 5°–25°) must balance ease of ejection with wear resistance. Too shallow an angle may cause sticking; too steep may lead to jamming.  

(2) Material and Heat Treatment  

- Lifters are often made of hardened steel (e.g., SKD61, H13) and heat-treated (HRC 48–52) for durability.  

(3) Lubrication and Guidance  

- Wear plates or oil grooves reduce friction and extend lifter lifespan.  

(4) Stroke Calculation  

- The ejection stroke must exceed the undercut depth to ensure complete release.  

6. Conclusion  

Lifters are essential in mold design, particularly for plastic parts with undercuts. Their simplicity, cost efficiency, and reliability make them widely used in electronics, appliances, automotive components, and more. Proper design of angles, materials, and motion ensures longer mold life and higher product quality.  

Precision injection molding characteristics

 

Precision injection molding characteristics

     The Precision injection molding is generally referred to as the precision of forming parts and surface quality is demanding high technology, some people think that precision injection is the size of plastic parts to achieve the accuracy of 0.01 ~ 0.001 mm injection molding process. In recent years, with the electronic, medical, communications, automotive, and other industries. With the rapid development of people’s plastic products, high precision, high-performance requirements. The traditional plastic molding process has been difficult to meet the current high standards. Is one of the most important plastics molding methods. Therefore, precision injection molding technology more and more people’s attention. Making precision injection molding technology continues to progress, new technology continues to emerge. Factors that affect precision injection molding require high dimensional accuracy, low warpage, excellent transfer characteristics, and excellent optical properties.

Therefore, it is on the injection molding machine, injection mold, molding process, raw material properties. And formulations have special requirements, affecting the many factors of precision injection molding. According to the current actual production point of view, the impact of precision injection molding factors are the following aspects:

1. Plastic shrinkage design of precision plastic products, plastic shrinkage should be considered.
2. The shape and size of the product The shape and size of the plastic parts have a great impact on the accuracy of the parts, the production practice shows that the more complex the shape of the product and the larger the size, the lower the accuracy
3. Mold structure The accuracy of plastic parts and mold cavity number and production volume are closely related. It is also shown that the accuracy of the single-cavity mold structure is higher than that of the multi-cavity mold, and the accuracy of small-mass production is higher than that of large quantities.