PC and abs alloy plastic injection molding process

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List of contents for this article:

• 1、Injection molding process for ABS plastics and products
• 2、Internal stress elimination method and internal stress cracking test method for PC/ABS or PC
• 3、Application of universal PC/ABS alloy in luggage shell manufacturing

Injection molding process for ABS plastics and products

ABS injection molding process is a process that takes advantage of the characteristics of ABS plastic's high mechanical strength and good comprehensive properties, and produces high-quality parts by controlling parameters such as drying, injection temperature, injection pressure, injection speed, mold temperature and material volume.

The injection molding process is a process in which molten raw materials are pressurized, injected, cooled, mold opening, and demoulding to make semi-finished parts of specific shapes.

Solution: ABS materials have a better effect when using moderate injection speeds. When producing thin-walled and complex products, a sufficiently high injection speed must be ensured. Causes of material management problems: When general injection molding machines inject ABS plastic, if the single injection volume is not properly controlled, it may affect product quality and size stability, resulting in surface luster and uneven color tone.

Using high mold temperatures can increase material fluidity, improve bond line strength, reduce internal stress in molded products, and improve heat resistance and chemical resistance. For spray-free materials with ABS as the substrate, the mold temperature is usually 70-90 ° C. Mold design requires special structural design: spray-free materials have special requirements for product structural design and injection mold design. The mold design and forming process of ordinary materials cannot meet normal forming requirements.

Internal stress elimination method and internal stress cracking test method for PC/ABS or PC

1. For products that still have large internal stress after injection molding, annealing can be carried out. The oven temperature is controlled at 125~135℃ for 2 hours, and then naturally cooled to room temperature. Internal stress cracking test method: Acetic acid immersion method: Completely soak PC or PC/ABS products with screw grooves or columns in glacial acetic acid at 25℃ for 30 seconds (or adjust the immersion time according to product requirements). Remove and dry and carefully inspect the surface.

2. Cooling method: It is necessary to slowly cool down to below 40 ° C with the furnace or bath before taking out the workpiece to avoid internal stress again caused by rapid cooling. (2) Equipment and common equipment in the scope of application: hot air circulation oven, constant temperature water bath (low-melting point or thin-walled parts are more suitable for water bath heating).

3. Molecular weight and distribution: Select resins with large molecular weight and narrow distribution to enhance the interaction between molecular chains and improve cracking resistance. Impurity control: Reduce impurity content and avoid stress concentration. Blending modification: PS or PE is mixed into PC to relieve stress through spherical dispersion of internal stress or formation of cavitation zones. Enhancement and modification: Add glass fiber (such as 30% GFPC) to entangle macromolecular chains and improve stress cracking capabilities.

4. Select high-impact grades: such as ABS/PC alloy or ABS toughened by rubber to improve the material's cracking resistance. Adding additives: Add nucleating agents or lubricants to improve molecular arrangement and reduce internal stress. Key precautions for crack location investigation: Stress cracks mostly start in stress concentration areas such as gates, weld lines, and edges. The design and process parameters of these areas need to be checked mainly.

Application of universal PC/ABS alloy in luggage shell manufacturing

The bottom layer of this composite material is made of ABS plastic to provide skeleton support, and the surface layer is covered with PC material to form drop resistance armor. It is equivalent to hedging the 20% weight advantage of portable aluminum alloy with the 30% cost disadvantage of traditional pure PC, and finally produces a durable and non-weighing travel case. Lightweight needs: The 23kg limit for economy class on international flights forces material upgrades.

Some brands will further enhance durability through configurations such as aluminum alloy frames, TSA locks, and reinforced corner pieces. For example, aluminum alloy frames increase overall structural strength and disperse impact forces;TSA locks enhance safety and avoid damage caused by violent unpacking. These designs allow ABS+PC luggage to remain lightweight while meeting the stringent needs of long-distance travel or frequent checkings, forming a dual guarantee of "material + design".

Features: Generally, a trolley case made of ABS+PC material will be divided into three layers, and the middle layer is ABS. For products with good processing technology, ABS materials can hardly be detected. The appearance is similar to PC material, but the performance is better. Advantages of aluminum-magnesium alloy material: high strength, low density, good heat dissipation, widely used in electronics, automobiles, aerospace and other fields.

Thereby showing a strong aesthetic effect. PC, although it is the plastic with the best impact resistance, has the shortcomings of easy cracking and low fatigue strength, which limits its application scope to a certain extent. To sum up, ABS and PC have their own advantages, and which material to choose depends on the specific application needs. In the manufacturing of trolley boxes, the combination of the two can give full play to their respective advantages and achieve dual improvements in performance and aesthetics.

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