What are the acrylic products that are both beautiful and easy to use in injection molding?

History of Acrylic Acrylic, commonly known as specially-treated plexiglass. The research and development of acrylic has a history of more than 100 years. The polymerization of acrylic was discovered in 1872; In 1880, the polymerization of methacrylic acid became known; In 1901, the synthesis method of propylene polypropionate was completed; In 1927, the aforementioned synthesis method was used to try industrial manufacturing; In 1937, the industrial manufacturing of methyl acid was successfully developed, and it entered large-scale manufacturing.

During World War II, due to its excellent toughness and light transmittance, acrylic was first used in the windshield of aircraft and the vision mirror in the cockpit of tank drivers. The birth of the world's first acrylic bathtub in 1948 marked a new milestone in the application of acrylic. Junyi acrylic cups, acrylic display racks, acrylic boxes and other products can be injection molding.

Acrylic products have high transparency, corrosion resistance and high hardness, and acrylic products are generally products with transparent effects; Some acrylic products that are both good-looking and easy to use are: acrylic crystal balls, acrylic lampshades, acrylic cups, acrylic sealed jars, acrylic perfume bottles, acrylic cosmetic bottles, etc.; If you have a good creative design, you can directly provide 3D artwork to the factory to customize acrylic products.

1. Warpage and deformation The warping and deformation of acrylic injection molding products are more difficult problems. It should be mainly solved from the aspect of mold design, and the adjustment effect of molding conditions is very limited. 2. Air bubbles The reason for the bubbles produced in the injection molding process of acrylic injection molding products is often due to the large wall thickness of the product.

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Pro-acrylic lampshade good acrylic material lampshade has excellent optical properties and good transparency, good toughness, and is not easy to break; Strong repairability, good light transmittance up to 92%. It is unmatched by other plastics for its transparency, weathering properties for a variety of optics, and very strong weather resistance.

The plastic lampshade has high light transmittance, high diffusion, no glare, no light and shadow, aging resistance, flame retardant (flame retardant grade), ultraviolet resistance (weather resistant grade), extrusion, injection molding, flexible and free processing, pure color, beautiful appearance, high impact strength (drop resistance), and long service life. Acrylic, also known as PMMA or plexiglass, is derived from the English acrylic (acrylic plastic), and its chemical name is polymethyl methacrylate. It is an important plastic polymer material developed earlier, with good transparency, chemical stability and weather resistance, easy dyeing, easy processing, beautiful appearance, and has a wide range of applications in the construction industry.

Plexiglass products can generally be divided into pouring plates, extruded plates, and molding compounds. Hope mine can help you <>

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Acrylic, also known as PMMA or delayed machine glass, its injection molding process is as follows.

1. Plastic treatment.

PMMA has a certain water absorption, and its water absorption rate is up to, and the injection molding must be at the following temperature, usually. The presence of moisture causes bubbles, streaks, and reduced transparency in the melt. Therefore, it is necessary to carry out drying.

The drying temperature is 80-90 for more than 3 hours.

In some cases, the material can be used 100%, and the actual amount depends on the quality requirements, usually more than 30%, and the material should avoid contamination, otherwise it will affect the transparency and the nature of the finished product.

2. Injection molding machine selection.

PMMA has no special requirements for injection molding machines. Because of its high melt viscosity, it requires a deep groove and a larger diameter nozzle hole. If the strength of the product is required to be high, a screw with a larger aspect ratio should be used for low-temperature plasticization.

In addition, PMMA must be stored in a dry hopper.

3. Mold and gate design.

The mold temperature can be 60 -80, the diameter of the sprue should match the inner taper, the best angle is 5 ° to 7 °, if you want to inject 4mm or more products, the angle should be 7 °, the diameter of the sprue is 8 to 10 mm, and the overall length of the gate should not exceed 50mm. For products with a wall thickness of less than 4mm, the runner diameter should be 6-8mm.

For products with wall thickness greater than 4mm, the diameter of the runner should be 8-12mm. The depth of the gate, fan and vertical gate should be to the thickness of the product wall), and the diameter of the needle gate should be to 2mm; Smaller sizes should be used for low viscosity. Common vents are as deep as 6 mm wide.

The demoulding slope is 30 -1°, and the cavity part is between 35 -1° and 30°.

4. Melt temperature.

It can be measured by the air injection method: ranging from 210 to 270, depending on the information provided by the ** provider.

5. Injection temperature.

Fast injection can be used, but to avoid high internal stress, it is advisable to use multi-stage injection, such as slow-fast-slow, etc., and slow speed is used when injecting thick parts.

6. Length of stay.

If the temperature is 260, the maximum stay time is 10 minutes, and if the temperature is 270, the stay time cannot exceed 8 minutes.