Listado de la etiqueta: Moldeo por inyección de acrílico

,

Moldeo por inyección de acrílico

Moldeo por inyección de acrílico

How Do You Achieve High Quality Acrylic Injection Molding?

It is important to reach a high gloss surface with minimum shrinkage defects when using moldeo por inyección de acrílico for your injection-molded products. When you make acrylic injection molding parts, some simple points to define the quality of acrylic molding will be: a completely clear high gloss surface, minimum shinkage defects, high precision dimensions (if needed), no break marks, etc.

This blog aims to discuss ways to improve acrylic molding accuracy. Learn strategies, recommendations, and recommendations for success. We pinpoint temperature regulation, pressure levels, and other features. Welcome to the path of precision in acylic molding.

What is Acrylic Injection Molding?

Acrylic injection molding, or Inyección de PMMA molding, is the manufacturing process of melting acrylic resin to be injected into the mold cavity using a high pressure of about 150 MPa (normally between 100 and 170 MPa). The process involves barrel temperatures of between 220 and 260 degrees. Melt flow index (MFI) is essential for controlling viscosity.

To make high-clear acrylic molding parts, the screw, nozzle, and clamping unit can be referred to as critical parts of the molding machine. Cycle times may vary from 30 seconds to 300 seconds, depending on the PMMA Espesor de la pared del moldeo por inyección.

Dimensional stability is achieved by stringent regulation of the rate at which the parts are cooled. Mold temperature-control devices control the cooling process. The injection speed also affects the surface finish of the final product.

moldeo por inyección de acrílico

How to Prepare Acrylic Material for Injection Molding?

Acrylic molding is not an easy process because, typically, when you need acrylic mold parts, you need high-transparent or semi-transparent parts. In that case, it is not allowed to have any issues with the acrylic-molded part from inside to outside. Below are the basic steps to make acrylic-molded parts:

Selección de materiales

Therefore, it is important to select the right acrylic grade of materiales de moldeo por inyección. Transparency, strength, and heat resistance are important. Consequently, the melt flow index (MFI) must correspond to the molding process. Employ PMMA that has good optical properties.

Discuss the role of impact modifiers for toughness. It is also important to note that colorants can be incorporated during the mixing phase. It is also important to meet the application requirements of the acrylic resin.

Drying Techniques

During the PAAM molding process, correct drying of acrylic resin reduces imperfections. Desiccant dryers should be used because of their effectiveness in moisture removal.

Drying temperatures vary between 60 and 90 degrees, with a minimum of 3 hours of drying time. Ensure that there is steady air circulation throughout the drying hopper. Measure the moisture level with a hygrometer.

One should make sure to dry all surfaces uniformly to prevent hydrolysis. The drying process normally takes between two and four hours, and make sure to clean the drying hopper and not mix any other type of material with acrylic materials.

Consistency

It is important to be consistent with acrylic injection molding. Total melt viscosity is critical for quality acrylic molding parts. Ensure that the injection unit is calibrated often. Control the temperatures within the barrels and make the necessary adjustments. It has been found that screw speed influences material flow.

Maintain consistent cooling times to minimize warping. Ensure molds are checked frequently for signs of wear and tear.

If you are molding clear acrylic injection molding parts, cleaning the injection unit and barrel will be very important. Make sure there is no other type of material lost in the barrel; otherwise, there will be some black spots or flow marks in the acrylic molded parts. That is why there is a special injection molding machine that is specially made for clear molded parts. Because cleaning the barrel will cost maybe one day and waste lots of materials.

Aditivos

The use of additives in the injection molding of acrylic improves its performance. UV stabilizers prevent the adverse effects of sunlight. Plasticizers improve flexibility. Apply flame retardants where they will be needed most—in safety-critical applications.

Anti-static agents are used to minimize static charges. When adding the additives, ensure that they are well dispersed throughout the system. Check the final blend for the required characteristics.

Homogeneity

The uniformity of the material is crucial in acrylic injection molding. Spread the resin and additives evenly. Ensure that the material fed into the hopper is thoroughly blended.

When mixing the product, make sure to use a high-shear screw. Look for variations between batches. Stabilize the melt temperature. This results in fewer defects being encountered on the final parts.

What Are the Key Parameters in Acrylic Injection Molding?

Basically, when you are working with actylic mold, every small detail will affect the quality of the acrylic molded part. That is the reason why most molding companies are not professional in making injection molding acrylic parts, because there are lots of extra special equipment needed to make high-quality actylic injection molding parts. Below are some of the key parameters for acrylic molding process.

Temperature Settings

Temperature control in moldeo por inyección de acrílico is very important. Barrel zones are usually between 220 and 280 degrees. The temperature of the nozzle must correspond to the flow of the melt; a low melt temperature will not be able to get a high-quality clear surface; a high melt temperature will decomposite the acrylic material so that the acrylic-molded part will become yellow or dark.

Mold temperatures have an impact on part clarity. A normal mold temperature is between 40 and 70 degrees, depending on the acrylic molding wall thickness. Gradual heating helps to avoid the degradation of the material. As it is widely known, stable temperature patterns promote uniformity in quality.

It is recommended that heating elements be calibrated frequently for correct measurements.

Pressure Control

Accurate control of pressure is a key factor in preventing defects in the injection molding of acrylic parts. As for the injection pressure, it ranges from 10,000 psi to even more. Pressure retention preserves some cohesion. Check the clamping pressure to minimize flash.

Pressure ramps help to avoid a sharp increase in material consumption rates. Modify as per the viscosity of the material. Periodic checks help maintain consistent molding conditions.

Injection Speed

This is a clear indication that the speed of the injection has a direct effect on the quality of the acrylic part being produced. High speeds involve filling molds rapidly, hence the short cycle time.

Continue to monitor the screw speed to ensure an even flow. Increase speed for simplicity of geometry. Low speeds also ensure that air does not penetrate into the fuel system in large quantities.

To prevent such imperfections, it is advisable to strike a balance. Speed calibration should be done often.

Flow Rate

Flow rate plays a crucial role in acrylic injection molding. It describes how material gets into the mold. Here, adjustments depend on the part design. Check the melt flow index (MFI) to ensure that it is constant. The gate sizes should be controlled to foster a uniform distribution.

Regularly check the flow meters. This will help to achieve an even distribution of the material so as to prevent the formation of surface imperfections on the product during acrylic plastic molding.

Tiempo de enfriamiento

Part dimensions in acrylic injection molding depend on the cooling time. A longer cooling time ensures stability. Utilize mold temperature controllers to ensure accurate cooling.

Monitor internal mold temperatures. To fine-tune cycles, gradually shorten cooling times. Even cooling prevents warping. Another is to systematically inspect the cooling passages for obstructions.

moldura acrílica

How to Design Acrylic Molds for Acrylic Injection Molding?

Precision Design

Accuracy is extremely important in acrylic injection molding. All tolerances should be in micrometers. Maintain an equal thickness of the wall in order to avoid areas of tension. CAD software should be used to draw more detailed designs. Implement cooling channels strategically.

Improve the part design

Before making acrylic molds, a DFM (Diseño para fabricación) report should be carried out to check any possible potential issues. Unlike other types of plastics, such as ABS or PP, acyrlic injection molding parts will be easy to break or crack from some corners, so inserts and ejector system design is very important. Sending the customer a completely DFM report for approval will be very helpful to reduce the further issues.

Gate Design

Gate design is one of the most important factors in making high-quality acrylic injection molding products; this is unlike other injection molding materials that could use sub-gates or banana gates.

Gate locations impact flow. The simulations should be used to validate the gate design on a regular basis. Designing to specific tolerances minimizes errors and enhances part performance.

When we work with actylic molds, side gate design is mostly used in the mold; the spure angle should be 5° to 7°. If the acrylic molding wall thickness is 4 mm or above, the spure angle should be 7°, the diameter of the main runner should be 8 to 12 mm, and the overall length of the runner should not exceed 50 mm.

For acrylic plastic injection molding products with a wall thickness less than 4 mm, the main runner diameter should be 6–8 mm. For acrylic molding products with a wall thickness greater than 4 mm, the main runner diameter should be 8–12 mm.

Mold Complexity

Mold complexity is known to have an impact on the results of acrylic injection molding. Multi-cavity molds boost productivity. Lifters and slides are used for undercut features; venting insert design for deep ribs will be better for the polishing process and reducing air trap issues.

It is vital to utilize hot runners for proper and continuous material flow. There is nothing as complex as geometry, and that is why there is a need for machining.

Think about the parting lines in cases of easy ejection. Stabilize the mold at high pressure. In addition, check molds frequently for signs of wear.

Mold Material Choice

Choosing the right steel material for molds is crucial in acrylic injection molding. Make it from hardened steel for durability. Aluminum offers faster machining for some low-surface rquriement molds. For better cooling, beryllium copper inserts can be used, especially for some deep ribs.

Since most acrylic injection molding products will be completely clear and high gloss, or semi-clear and high gloss, cavity steel selection will be important; it needs easy polishing high gloss steel; mostly we use S136 or NAK 80 for actylic injection molds. Those two steels are the most popular mold materials for acrylic resin.

Thermal conductivity should correspond to the need for cooling. Material testing helps in determining the durability of the material used in construction.

Acabado de la superficie

Surface finish in acrylic injection molding plays a key role in determining overall part quality. Polished acrylic molds enhance clarity. Textured surfaces hide imperfections. Diamond polishing is best utilized for applications requiring a glossy finish. Implement electroplating for durability.

Ensure consistent mold maintenance. Control injection parameters for smooth finishes. Regularly inspect surface conditions.

 

Característica Precision Design Mold Complexity Elección del material Acabado de la superficie
Key Focus Precisión dimensional Multi-cavity, Inserts High-temp Alloys Hihg gloss Polishing, Texturing
Tolerancias ±0.01 mm Variable Resistencia al calor Smooth, Matte
Design Software CAD/CAM CAD, CAE Material Specs CAD for Textures
Canales de enfriamiento Conformal Cooling Advanced Layout Cooling Efficiency Min. Warpage
Injection Points Balanced side Gates Hot/Cold Runners Material Flow No Defects
Cost Considerations Tooling Cost High Complexity Material Cost High Gloss polishing Cost
Volumen de producción High-volume Runs Low to High Volume Batch Sizes Consistency

Table on How to Design Acrylic Molds for Acrylic Injection Molding!

moldes de acrilico

What Are the Best Practices for Acrylic Injection Molding Process?

Setup Calibration

In acrylic injection molding, it is very important to set up the calibrations correctly. Set the injection pressure according to the type of material to be used. Specifically, set barrel temperatures in the range of 220 to 290 degrees. Make sure the mold clamping force matches part sizes and shapes.

Turn the injection nozzle accordingly to achieve the best flow rate. Verify the cooling time settings. Daily or frequent calibration reduces defects and helps in achieving the best results.

Process Stability

Process stability is highly important to maintain in acrylic injection molding. Monitor barrel temperatures continuously. It is crucial to maintain a constant injection pressure during the cycle. Use consistent screw speeds. Keep cooling times uniform.

Before using the molds, check for any signs of wear and misalignment. This means that stable processes result in higher-quality parts and lower scrap margins.

Variable Monitoring

Controlling variables in acrylic injection molding helps one achieve quality products. Keep track of the melt flow index (MFI) in order to ensure consistency. Record the injection and holding pressures. Monitor mold temperatures. Ensure uniform cooling rates.

It becomes important to log cycle times for each batch. Check the data for consistency and variations. It is observed that accurate monitoring assists in achieving improved efficiency in the process.

Consistency Checks

Consistency checks need to be done when it comes to acrylic injection molding. Check that the wall thickness of the parts under consideration is uniform. Measure the dimensional accuracy regularly. Check for its optical clarity in the transparent section.

Check for the absence of surface defects. Carry out the tensile strength test after some time. Document all findings meticulously. This is a mere check to ensure that the manufacturing results are accurate.

What Role Does Cooling Play in Acrylic Injection Molding?

Cooling Importance

Cooling plays a significant role in acrylic injection molding. It ensures one-dimensional stability. Correct cooling helps to avoid warping, air bubbles, and shrinkage. Uniform cooling improves surface texture. Cooling channels in acrylic molds help to regulate the temperature.

The use of effective cooling preserves material characteristics. Supervision of the cooling phases enhances product quality. Effective heat dissipation is essential.

Effective Techniques

Efficient cooling methods improve acrylic injection molding. Employ conformal cooling channels to ensure an equal distribution of heat. Use a water- or oil-based cooling system. Monitor coolant flow rates. Use baffles and bubblers for complex molds.

Regularly maintain cooling circuits. Maximize the channel locations for effective heat dissipation. Repeatable processes improve part consistency.

Tiempo de enfriamiento

Cooling time is one of the critical parameters that has a direct impact on the efficiency of acrylic injection molding. Longer cooling allows the part dimensions to become stable. Accuracy results in the minimization of cycle time. The cooling should be adjusted depending on the thickness of the part.

The temperature of the mold should be monitored throughout the process. Maximize cooling cycles to increase efficiency. Regular cooling times help to eliminate the formation of defects. Regularly calibrate cooling equipment.

Cycle Efficiency

The overall cycle time in moldeo por inyección de acrílico highly depends on the cooling process. Rapid cooling reduces the time taken to complete a cycle. Effective means of cooling increase capacity. Coordinate cooling with mold filling and packing.

Thermal imaging should be used to monitor efficiency. Coherent cycles contribute to increased overall production rates. Regularly review cycle parameters to improve moldes de acrilico.

Temperature Control

Temperature regulation is very important in the cooling process of acrylic injection molding. Maintain consistent mold temperatures. Temperature controllers should be used for good regulation.

Ensure the coolant temperature is stable. Modify settings using the properties of the material being cut.

Introduce the necessary sensors for real-time monitoring. Constant temperatures avoid conditions like thermal stress. It is for this reason that the application of consistent control leads to quality parts.

acrylic plastic molding

acrylic plastic molding

How to Optimize Acrylic Injection Molding for High Precision?

Técnicas de precisión

Another advantage of the process is the precision of the injection molding of acrylic, resulting in high accuracy. Use CNC-machined molds for high tolerance. To continue the flow, use hot-runner systems. For dimensional stability purposes, perform controlled cooling.

Regularly calibrate injection parameters. Accurate screw and barrel designs must be employed. To ensure proper traffic distribution, it is crucial to identify the optimal positions of the gates. Regular inspection ensures precision.

Automation Use

The use of automation in the manufacturing process increases accuracy in the injection molding of acrylic. Use robotic arms for the handling of the parts. Employ automated quality inspection systems. Adopt the use of automated material feeding systems.

Make use of real-time process monitoring software. Automation reduces human error. Standardization of production schedules enhances precision. Indeed, the reliability of automation systems is achieved through regular maintenance of the automation systems.

Sensor Integration

Integration of sensors in acrylic injection molding enhances accuracy. It is recommended to install temperature sensors for better control of heat. Use pressure sensors to record injection force. Use flow sensors to ensure a constant rate of material flow.

Install sensors within mold cavities to collect real-time data. Monitor sensor data continuously. Modify the parameters in response to the feedback received. The accuracy of sensors enhances process control.

Process Refinement

The fine-tuning of the process enhances the accuracy of the injection molding of acrylics. Increase the injection speed and pressure parameters. Tweak cooling times for stability. Perform process changes in the simulation software. Ensure that process parameters are reviewed and updated as necessary.

Use feedback loops for the purpose of ongoing modification. Characterize data for perspective: defect analysis. Process refinement reduces variability.

Continuous Improvement

To have precision in acrylic injection molding, there is a need to constantly improve. Implement Six Sigma methodologies. Training of operators should be conducted frequently. Make statistics-driven recommendations on how things can be done better.

Perform compliance tests frequently. Proactively promote quality. Document all improvements. Sustained high precision can only be achieved if there is constant improvement.

Conclusión

All in all, to achieve a high level of precision in acrylic injection molding, which requires professional acrylic molding companies, the basic injection molding process is pretty much the same as for other materials; even small details will affect the quality of the final acrylic molded part. Use these techniques for better outcomes.

If you have acrylic mold requirements, welcome to contact us. Sincere Tech is one of the top 10 empresas de moldeo por inyección de plástico en China, offering acrylic molding, sobremoldeado, moldeo por inserción, and any other custom injection molding products.

/por

Moldeo por inyección de PMMA

Acrylic boxes

¿Qué significa? Moldeo por inyección de PMMA

PMMA injection molding, acrylic injection molding, or Moldeo de polimetilmetacrilato Es un proceso en el que se inyecta vidrio orgánico o acrílico en una cavidad de molde de inyección para moldear un producto particular al enfriarse y endurecerse. Moldeo por inyección de PMMA Las piezas se utilizan normalmente para fabricar algunos componentes o piezas transitorios, como ventanas de automóviles, lentes LED, cajas de exhibición y pantallas LED para algunos electrodomésticos. El acrílico se prefiere al vidrio porque tiene mejor resistencia a la abrasión. Moldeo por inyección de PMMA Tiene excelentes propiedades de transmisión de luz en comparación con todos los demás materiales plásticos del mundo actual, lo que lo convierte en un material ideal para aplicaciones donde la claridad es esencial. Además, hay muchas piezas de plástico transparente de paredes delgadas que seleccionan PMMA como material de moldeo.
Moldeo por inyección de PMMA

Tecnología de moldeo por inyección de PMMA

El PMMA es el material plástico más transparente, pero es más fácil de romper que el PC o el ABS, por lo que la modificación del PMMA aparece una tras otra, como la copolimerización entre metacrilato de metilo y estireno y butadieno, una mezcla de PMMA y PC, etc. El PMMA 372 es un copolímero de metacrilato de metilo y estireno. Si se añade una pequeña cantidad de caucho de nitrilo (aproximadamente 50%) al PMMA 372, se convertirá en PMMA 373.

The fluidity of injection molding PMMA is poorer than that of PS, ABS and its melt viscosity is rather sensitive to the change of temperature. In molding, it changes the melt viscosity mainly from the injection temperature. PMMA is an amorphous polymer, the melt temperature is above 200 Celsius degree and the decomposition temperature can reach 270 Celsius degree.

  1. Procesamiento de plástico
    PMMA plastics has a certain degree of water absorption of 0.3-0.4%. The injection molding PMMA La humedad debe ser inferior a 0,1%. Normalmente, es 0,04%. La presencia de humedad provoca burbujas, líneas de gas y baja transparencia. Por lo tanto, debe secarse. La temperatura de teñido es de 80 a 90 grados Celsius y el tiempo de secado es de 3 horas o más. En algunos casos, el uso de materiales reciclados puede alcanzar 100%. La cantidad real depende de los requisitos de calidad. Por lo general, puede alcanzar 30%. Debe asegurarse de que no haya contaminación de materiales reciclados, o influirá en la transparencia y la naturaleza de los productos terminados.
  2. Selección de una máquina de moldeo por inyección
    The Injection molding Material de PMMA doesn’t have special requirements for the injection molding machine. Due to the great melt viscosity, it requires the grooves to be deeper and the nozzle hole to have a larger diameter. If you need products with higher strength requirements, you should use a larger aspect ratio of the screw to implement low-temperature plastics. In addition, PMMA molding resin must use a drying hopper to store material.
  3. Diseño de molde y compuerta
    PMMA injection Mold temperature can be 60–80 °C. The diameter of the sprue should match the internal taper. The optimum angle is 5 to 7. If the wall thickness of injecting molding products is 4 mm or more, the angle should be 7, the diameter of the mainstream channel should be 8 to 10 mm, and the overall length of the gate should not exceed 50 mm.
    For PMMA injection molding products with a wall thickness less than 4 mm, the diameter of the flow channel should be 6–8 mm. If the PMMA wall thickness is more than 4 mm, the diameter of the flow channel should be 8–12 mm. The depth of the fan-shaped and tab-shaped gates should be 0.7 to 0.9 t (t is the wall thickness of the product), and the diameter of the pin gate should be 0.8 to 2 mm. Injection molding PMMA Products with lower viscosity should choose the smaller size. The common venting hole’s depth is 0.05 to 0.07 mm, its width is 6 mm, the stripping slope is 30′-1, and the and the cavity portions are between 35′-1 and 30.
  1. Temperatura de fusión
    El método de inyección de aire se puede utilizar para medir temperaturas que oscilan entre 210 y 270 grados centígrados, lo que depende de la información proporcionada por el proveedor.
  2. Temperatura de inyección
    You can use rapid injection to avoid generating a high degree of internal stress when work with PMMA injection molding material. It’s suitable to use multi-level injection, such as slow, fast, slow, etc. When injecting the thick parts, you should use a slow speed.
  3. Tiempo de permanencia
    Si la temperatura es de 260 grados Celsius, el tiempo de permanencia es de 10 minutos. Si la temperatura es de 270 grados Celsius, el tiempo de permanencia es de 8 minutos.

moldeo por inyección de acrílico

Aplicaciones del moldeo por inyección de plástico PMMA

Existen muchas industrias que necesitan piezas moldeadas por inyección de PMMA. A continuación, se muestran algunos componentes que utilizan piezas moldeadas por inyección de PMMA:

  1. Eyeglass lenses: PMMA is one of the best materials for eyeglasses due to its excellent optical properties. It has the highest transparency of all other plastic materials, PMMA injection molding making it the best choice for eyewear.
  2. Ventanas de plexiglás: el PMMA, también conocido como plexiglás o vidrio acrílico, es una alternativa popular a las ventanas de vidrio tradicionales debido a su alta resistencia al impacto y claridad óptica. Se utiliza comúnmente en edificios, acuarios e incluso ventanas de aviones.
  3. Carcasas de teléfonos móviles: El PMMA se utiliza en la fabricación de carcasas de teléfonos móviles debido a su alta resistencia a los impactos, a los arañazos y a su claridad óptica. Además, es ligero y se puede moldear fácilmente en distintas formas y tamaños.
  4. Carcasas de ordenadores y aparatos electrónicos: al igual que las carcasas de los teléfonos móviles, el PMMA se utiliza en la fabricación de carcasas de ordenadores y aparatos electrónicos debido a su durabilidad, resistencia a los impactos y claridad óptica. También es ligero y se puede moldear fácilmente en distintas formas y tamaños.
  5. Parabrisas de vehículos: El PMMA se utiliza habitualmente en la fabricación de parabrisas de vehículos debido a su alta resistencia a los impactos y su claridad óptica. Además, es más ligero que el vidrio, lo que puede mejorar la eficiencia del combustible.
  6. Lente LED: ves la luz en la calle y en tu casa; esa pequeña lente en el interior está hecha de piezas moldeadas por inyección de PMMA. Esto es muy popular en la industria de la iluminación.
Below the acrylic injection molding part Ya lo hicimos antes. Si tienes algún proyecto que necesite PMMA molded products, feel free to send us your data, and we will offer you the best quality with our expert experience in PMMA injection molding service.
Moldeo por inyección de PMMA

Moldeo por inyección de PMMA

Ventajas del moldeo por inyección de PMMA (moldeo por inyección de acrílico) moldura)

1. Produce productos resistentes a los arañazos.

Las investigaciones han confirmado que moldeo por inyección de acrílico Los materiales son más resistentes a los arañazos que otros productos de vidrio. De esta manera, el proceso de moldeado genera productos que pueden mantener su apariencia brillante durante mucho tiempo sin degradarse.

2. Produce productos ligeros y transparentes.

The biggest feature of PMMA injection molding is its high transparency, with a light transmittance of 92%, which is the best light transmittance among plastics. density is 1.185 grams per cubic centimeter. On the other hand, glass has a density of 2.4 grams per cubic centimeter, the highest light transmittance of glass is 91%. As a result, PMMA injection molding products that can be used as lightweight alternatives to glass.

3. El moldeo por inyección de PMMA puede producir diseños complejos.

El moldeo por inyección permite desarrollar formas avanzadas que no se pueden generar mediante otros procesos de moldeo por inyección, como el moldeo por inyección de metal. Proceso de moldeo por inyección de PMMA Puede reproducir un número significativo de productos que son idénticos en términos de forma, tamaño y peso.

4. Alta eficiencia de producción

En Moldeo por inyección de PMMA El proceso de moldeo por inyección de PMMA es más rápido que el de moldeo por inyección de metal. Como resultado, se pueden producir más unidades de producción mediante este proceso en un tiempo determinado. Los análisis técnicos han confirmado que las plantas de moldeo por inyección de PMMA tienen tiempos de ciclo más cortos, lo que aumenta la producción general de la industria.

5. Mejora de la flexibilidad del color

Moldeo por inyección de acrílico Produce artículos que pueden mezclarse con resinas para crear una amplia variedad de productos de colores. Por el contrario, esta característica no está presente en otros procesos, como el moldeo por inyección de metal o vidrio.

6. Material especial para altos requisitos de moldeo de plástico transparente.

Material PMMA llamado acrílico, o plexiglás, tiene una transmitancia de hasta 92%, que es más alta que el vidrio. Eso significa caja de acrílico transparente molding is one of the best options for high-requirement Piezas de moldeo por inyección transparentes, como vidrio, vidrio óptico, lentes, luces de automóviles, tubos transparentes, etc.

Custom Acrylic case

Desventajas del moldeo por inyección de plástico acrílico PMMA

Como cualquier otro proceso de fabricación de moldes, tiene su propio conjunto de desventajas que deben tenerse en cuenta. A continuación, se presentan algunas de las desventajas del moldeo por inyección de plástico acrílico PMMA.

  1. Los materiales producidos tienen una menor resistencia al impacto en comparación con los producidos por moldeo por inyección de metal.
  2. La resistencia al calor de la mayoría de los productos fabricados mediante el proceso de inyección de PMMA es baja (alrededor de 80 grados Celsius).
  3. La mayoría de los artículos producidos mediante este proceso tienen resistencias mecánicas menores, lo que limita su capacidad de carga.
  4. Algunos productos acrílicos tienen poca resistencia química, lo que los hace propensos a reaccionar con compuestos orgánicos.
  5. El moldeo por inyección de PMMA requiere invertir el molde de inyección especial, lo que implica un alto costo inicial de las herramientas, lo que no es beneficioso para volúmenes de producción bajos.
  6. Flexibilidad de diseño limitada. El proceso es más adecuado para producir productos con formas simples y uniformes. Los diseños complejos con detalles intrincados pueden resultar difíciles de lograr mediante el moldeo por inyección de plástico acrílico PMMA. Esta limitación puede ser un inconveniente importante para los fabricantes que buscan crear productos únicos e innovadores.

Consejos para fabricar piezas moldeadas por inyección de PMMA de alta calidad.

La fabricación de piezas moldeadas por inyección de PMMA es un poco diferente a la de otras piezas moldeadas por inyección porque, en la mayoría de los casos, cuando fabricamos piezas moldeadas de PMMA, fabricamos piezas de PMMA con alto contenido de vidrio. En ese caso, se necesita un equipo especial, especialmente para algunas piezas moldeadas por inyección de PMMA de pared gruesa. A continuación, se ofrecen algunos consejos para fabricar piezas moldeadas por inyección de PMMA de alta calidad.

Diseño de moldes

Dado que el PMMA es un material de transmisión, las marcas de flujo serán fáciles de ver y esto también podría ser un problema. Mediante el análisis del flujo del molde, será muy importante verificar cuál es la mejor ubicación de la compuerta. Una vez que se haya determinado la ubicación de la compuerta, la forma de la compuerta también es importante. En general, sugerimos diseñar una compuerta lateral o en abanico, que facilitará el llenado de la cavidad y evitará las marcas de flujo.

La máquina de moldeo por inyección y el tanque de agua caliente están en uso.

Si fabrica piezas de moldeo por inyección de PMMA de paredes gruesas, siempre tendrá problemas de hundimiento y burbujas porque los plásticos tienen una tasa de contracción. Cuanto más gruesa sea la pared, mayor será la tasa de contracción, por lo que habrá burbujas dentro de las piezas, sin importar cuánto dure el tiempo de enfriamiento, y cuando utilice un tiempo de enfriamiento prolongado, también aumentará el tiempo del ciclo, lo que aumentará el costo.

En ese caso, un tanque de agua caliente puede mejorar estos problemas. Utilice agua a una temperatura de 60 a 80 grados en el tanque de agua. Una vez que haya sacado las piezas moldeadas por inyección de PMMA de la cavidad del molde y las haya colocado en el tanque de agua caliente durante 6 a 12 minutos, retire las piezas moldeadas, por lo que los problemas de hundimiento y burbujas mejorarán en gran medida.

Fabricar piezas moldeadas de PMMA de alta calidad no es una tarea fácil. Si tiene un proyecto que necesita piezas moldeadas de PMMA, es muy importante encontrar un contratista de moldeo por inyección de PMMA profesional. Esto garantizará el éxito o el fracaso de su proyecto.

Conclusión
Teniendo en cuenta los puntos anteriores, es esencial comprender cómo funciona el moldeo por inyección de PMMA, sus aplicaciones, ventajas y desventajas. Además, este conocimiento es vital para ayudarlo a comprender el proceso de moldeo por inyección de PMMA.
Si desea ver más piezas de moldeo de plástico transparente, visite nuestra moldura de plastico transparente página. Si tienes algún proyecto que necesite PMMA injection molding or any other custom acrylic box mold and molding parts, you are welcome to send us an email, We have been working with PMMA injection molding parts over 12 years and solved lots of PMMA molding issues.
/por