Guía para principiantes para aprender los métodos básicos de moldeado de plástico

¿Qué es el moldeado de plástico? Fabricante de piezas moldeadas de plástico

El fabricante de piezas de plástico moldeado utiliza moldes de plástico en silicona para obtener productos fuertes de cualquier complejidad y diseño. El grosor de los elementos obtenidos también puede ser diferente, así como el volumen.

Furthermore, special molds are used for work. Which allow reproducing several hundreds or thousands of identical elements. The methodology is used by enterprises and individuals for small-scale and large-scale production.

The so-called color-changing substance produced by fabricante de piezas moldeadas de plástico

Molding is the process of making various forms of polymers like:

• Powders
• Pellets
• solutions or dispersions

into products of the desired shape. It is the most important in the entire process of plastic material molding and processing. It is the production of all polymer materials or profiles the necessary process. Plastic molding methods include the following:

• extrusion molding
• moldeo por inyección
• moldeo por compresión
• moldeo por transferencia
• lamination molding
• blow molding
• calendar molding
• foam molding, thermoforming, etc.

Various molding methods have their adaptability which are introduced by Plastic molded parts manufacturer

What happens when the molded product changes color?

The so-called color-changing means, that the chemical properties of some substances contained in the molded product may change.

The reason for the color-changing needs to be considered according to various constituent substances. Plastics are composed of several of the following 5 substances:

(1) polymers (resins)

(2) stabilizers

(3) performance-imparting substances

(4) filler

(5) other resins.

Plastic molded parts manufacturer Discoloration of polymers

Muchos productos fabricados por el fabricante de piezas moldeadas de plástico  apenas tienen el problema de la decoloración del polímero. En las sustancias orgánicas, debido a que la estructura del color es limitada, se puede juzgar si es propenso a un cierto grado de decoloración según la estructura del polímero.

Por ejemplo, se conoce el esqueleto básico de las resinas. Como la serie de uretano es fácil de formar dobles enlaces covalentes. Por lo tanto, es susceptible a la decoloración debido a los rayos ultravioleta y otros factores.

Los fabricantes de piezas moldeadas de plástico estabilizaron las propiedades

El estabilizador agregado al material de resina que cambia de color tiene algunas propiedades. Absorbe la energía luminosa de los rayos ultravioleta y otras sustancias o captura los radicales libres.

Since ultraviolet energy and free radicals will decompose the polymer, their stabilizers are used instead of polymerization React to prevent the deterioration of the polymer. However, the more effective the stabilizer the more likely it is to change color after the reaction.

Especially the quinone type and other stabilizers formed by El fabricante de piezas de plástico moldeadowith an aromatic or fluorine ring structure. Although, there are the most varieties and the best performance on the market but the discoloration is also the most obvious.

Plastic molded parts manufacturer Performance-imparting substances

The performance-imparting substances differ in their properties and methods of use. So,  Plastic molded parts manufacturers should judge individually and cannot be generalized.

What is the function of the Filler?

Many fillers can be said to have almost no problem with discoloration. Such as:

• engineering plastic glass fiber and
• Mineral fillers.

However, in glass fiber and other materials sold as products, a small amount is added due to that addition. So these resins have the possibility of discoloration due to thermal degradation, although this possibility is very small.

(5) Other resins

The discoloration problems of other resins are basically the same as:

1. In summary, the substance most likely to cause discoloration is a stabilizer. However Plasticmolded parts manufacturer uses it in order to prevent the deterioration of the polymer.
2. At present, stabilizer manufacturers are still developing stabilizers with higher effects and less discoloration. At the same time, many resin and plastic molded parts manufacturers are also studying ways to better use stabilizers.

Factors involved in Plastic molded parts manufacturers resins

The factors that cause discoloration of materials can be summarized as follows:

• Caused by thermal energy.

If the resin is thermally decomposed in a high-temperature environment, free radicals are sometimes generated. Furthermore, in general, if the resin stays in the molding machine barrel for a long time. Then tar-like substances will be generated. Causing the color changes to brown or black.

The daylight caused by light energy do not need to repeat. Even fluorescent lamps emit ultraviolet rays. If placed in this environment for a long time, the resin will change color due to the action of ultraviolet rays.

Because the nature of the stabilizer reacts, the color ranges from yellow to Between brown. The amount of energy absorbed varies depending on the color of the molded product created by plastic molded parts manufacturer. The speed of discoloration also varies depending on the color of the molded product.

Plastic molded parts manufacturers mechanical  energy

Sometimes the mechanical energy becomes heat energy, causing resin discoloration. Specifically, when the molding machine wants to forcefully transfer the resin without sufficiently heating the resin in the metering area

What are the ways of Plastic molded parts manufacturers discoloration countermeasures?

1. Discoloration caused by molding

The biggest factor of fabricante de piezas moldeadas de plástico discoloration during molding is the retention of resin in the cylinder. To this end, measures can be taken to shorten. The residence time of the resin and take measures to fully replace the resin after a long period of storage.

Because of the higher the temperature, the greater the retention, and color change. So, the key is to not increase the barrel temperature excessively. Furthermore

2. The color change caused by light

The color change caused by light is used indoors and it is very slow. If it is a daily necessity, etc. A fabricante de piezas moldeadas de plástico probably be ignored. At this time, it is helpful special attention is paid to fluorescent lamps.

For example, when storing products in warehouses and other places. It is best to block the light to avoid direct irradiation. And to turn off the fluorescent lamps at any time. When used in places where direct sunlight is shining outdoors and in automobiles.

 It is recommended to choose weather-resistant products by fabricantes de piezas de plástico moldeadas.

Electrons usually exist in pairs within the atom. However, in very rare cases, such paired electrons are destroyed by the action of heat and light. And exist in a separate form.

El átomo o grupo atómico que contiene este electrón se llama radicales libres. Los radicales libres tienen una alta actividad y son extremadamente inestables. Una vez producidos, descompondrán rápidamente la sustancia o reaccionarán con otras sustancias.

Cuando los radicales libres reaccionan con la resina, a menudo descomponen su cadena principal, lo que reduce sus propiedades mecánicas.

El método de formación de material del fabricante de piezas moldeadas de plástico.

Es una parte importante del diseño de la pieza. También es un problema que fabricantes de piezas de plástico moldeadas . Y también es un factor clave en el proceso de procesamiento de materiales.

Además del moldeo por inyección, el moldeo de plástico también tiene moldeo por extrusión. Como:

• hojas y tubos
• Moldeo por soplado, como botellas de agua mineral.

But no matter what molding method, there should be a “limited” way of existence. This thing you can Understanding as a mold. Compared with other molding methods, injection molding is undoubtedly the most common processing method among molding methods

What are the molding methods of plastic molding machines? fabricante de piezas moldeadas de plástico

Plastic molding machine processing is engineering technology. which involves various processes for converting plastics into plastic products. During the plastic molded parts manufacturer transformation process, one or more of the following conditions often occur. Such as the rheology of the polymer and changes in physical and chemical properties.

The main equipment for compression molding and compression molding is a press and a mold. Presses are self-contain hydraulic presses, with tonnages ranging from tens of tens to hundreds of tons.

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