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Polyplastics emplea un nuevo método de prueba para identificar y evitar las quemaduras por gas durante el moldeo por inyección
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News provided by

Polyplastics Co., Ltd.

Sep 16, 2021, 02:05 ET

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TOKIO, 16 de septiembre de 2021 /PRNewswire/ -- Polyplastics Co., Ltd., un proveedor global líder de termoplásticos de ingeniería, ha identificado diversas soluciones para ayudar a los procesadores a limitar la incidencia de quemaduras por gas durante el proceso de moldeo por inyección. La empresa aplicó su método de investigación de gas al método de prueba de moldeo por inyección (GIMIM) para analizar el fenómeno y ayudar a plantear medidas preventivas.

(Imagen: https://kyodonewsprwire.jp/prwfile/release/M100475/202109069686/_prw_PI1fl_27qUX9ew.jpeg)

Los gases que se producen durante el moldeo no pueden escapar y son comprimidos, lo que resulta en una superficie de resina caliente y quemada que amenaza el moldeo continuo. En primer lugar, el estudio examinó el gas resultante de la pérdida de energía en el momento de la inyección. Las boquillas de las máquinas de inyección típicas están compuestas por una estructura que se ha contraído drásticamente, y la pérdida de energía se produce como resultado de la forma. Las soluciones potenciales incluyen reducir la velocidad de inyección, usar múltiples compuertas o cavidades y aumentar el tamaño de la compuerta y la boquilla.

Para evitar una conducción térmica desigual dentro del barril de inyección, los hallazgos sugieren evitar máquinas de inyección excesivamente grandes en relación con los artículos moldeados, reducir la temperatura del cilindro y evitar el moldeo por contacto con el molde para que no se produzca la pérdida de calor en el molde.

El método GIMIM también determinó que la obstrucción de la ventilación es resultado de una compleja relación entre los volúmenes de sustancias con bajo y alto punto de ebullición, y el volumen total de sustancias dentro del gas de descomposición. Las medidas correctivas incluyen la reducción de la temperatura del cilindro y el uso de un trapo u otro objeto similar para limpiar frecuentemente los depósitos de molde que están ligeramente pegados a las salidas de gas.

Por último, se determinó que el método de prueba GIMIM puede verificar el proceso de purga. Hasta ahora, no había ningún método para verificar los efectos del proceso de purga más que la confirmación visual después de moldear muchas inyecciones de material. Dado que el GIMIM puede detectar sustancias en unidades de ppm, se puede utilizar para verificar si el proceso de purga se llevó a cabo correctamente a través de solo un pequeño número de inyecciones con máquina.

Para obtener más información, visite https://www.polyplastics.com/en/support/mold/gas_burn/index.html

Acerca de Polyplastics: https://kyodonewsprwire.jp/attach/202109069686-O1-ovxjUQEC.pdf

FUENTE Polyplastics Co., Ltd.

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