在一次性餐具的注塑成型過程中，有三個過渡階段：一是一次性餐具材料沒有進入料筒時的顆粒狀態(tài)；二是塑料在料筒內(nèi)流動達到“二次極”狀態(tài)；三是一次性餐具材料通過一次性餐具模具澆注系統(tǒng)的流動和冷卻。在每個階段，都必須有特定的工藝成型條件。

In the injection molding process of disposable tableware, there are three transitional stages: one is the particle state when the disposable tableware material does not enter the barrel; Second, the plastic flow in the barrel reaches the "secondary pole" state; The third is the flow and cooling of disposable tableware materials through the pouring system of disposable tableware mold. At each stage, there must be specific process forming conditions.

顆粒狀態(tài)：

Particle status:

預(yù)熱干燥：

Preheating and drying:

原料預(yù)熱干燥1.5-2min，料溫升80C°-100c°。原因是原料中的水分含量往往過高。如果直接放入桶中，產(chǎn)品表面會變暗，顏色不均勻，表面起泡。但預(yù)熱時間要適當(dāng)，溫度不宜過高。溫度過高，產(chǎn)品表面會出現(xiàn)焦斑；如果預(yù)熱溫度過高或預(yù)熱時間過長，產(chǎn)品表面顏色會不均勻。

The raw materials shall be preheated and dried for 1.5-2min, and the material temperature shall rise to 80C ° -100c °. The reason is that the moisture content in raw materials is often too high. If the product is directly put into the barrel, the surface of the product will become dark, the color will be uneven, and the surface will blister. However, the preheating time should be appropriate and the temperature should not be too high. If the temperature is too high, the product surface will appear coke spots; If the preheating temperature is too high or the preheating time is too long, the product surface color will be uneven.

進料測量：

Incoming measurement:

進料量要準確。原料過多，產(chǎn)品毛邊過多，難以清洗；原料太少，成型壓力不足，產(chǎn)品不能完全固化。

The feeding amount shall be accurate. There are too many raw materials and too many rough edges, which are difficult to clean; Too few raw materials, insufficient forming pressure, and the product can not be fully cured.

融合狀態(tài)：

Fusion status:

控制成型溫度和壓力：

Control forming temperature and pressure:

根據(jù)一次性餐具材料佳成型條件的要求，一次性餐具模具的成型溫度應(yīng)控制在150-220℃。初始壓力控制在70mpa-90mpa之間，加壓時間1-5s。如果原料溫度過高，容易造成產(chǎn)品表面有焦斑，產(chǎn)品顏色不均勻；初壓時間過長，產(chǎn)品表面會松散；不合適的成型溫度和壓力會導(dǎo)致塑料流動性能變差。

According to the requirements of good molding conditions for disposable tableware materials, the molding temperature of disposable tableware mold should be controlled at 150-220 ℃. The initial pressure is controlled between 70mpa-90mpa and the pressurization time is 1-5s. If the raw material temperature is too high, it is easy to cause scorch spots on the product surface and uneven product color; If the initial pressing time is too long, the product surface will be loose; Improper molding temperature and pressure will lead to poor plastic flow performance.

排氣狀態(tài)：

Exhaust status:

一次性環(huán)保餐具成型過程中會產(chǎn)生冷凝水和揮發(fā)性氣體，所以成型過程中應(yīng)進行排氣，防止制品表面松動。通常，放氣的次數(shù)和時間由經(jīng)驗決定，放氣動作應(yīng)盡可能快。只要及時卸壓，恢復(fù)原來的壓力，放氣操作就完成了。餐具的結(jié)構(gòu)并不復(fù)雜，所以不需要從一次性餐具模具的角度考慮排氣結(jié)構(gòu)。

Condensing water and volatile gas will be produced during the molding process of disposable environment-friendly tableware, so exhaust should be carried out during the molding process to prevent the product surface from loosening. Generally, the number and time of bleeding are determined by experience, and the bleeding action should be as fast as possible. As long as the pressure is relieved in time and the original pressure is restored, the bleeding operation is completed. The structure of tableware is not complicated, so it is not necessary to consider the exhaust structure from the perspective of disposable tableware mold.

模流和冷卻設(shè)置：

Mold flow and cooling settings:

固化階段：

Curing stage:

排氣后立即合模，壓力升70-90mpa約70s。在這個階段，固化時間要足夠長，否則產(chǎn)品表面會變黑。

Close the mold immediately after the exhaust, and the pressure rises to 70-90mpa for about 70s. At this stage, the curing time should be long enough, otherwise the product surface will turn black.

脫模：

Demoulding:

固化后對產(chǎn)品進行風(fēng)冷，噴涂機構(gòu)對產(chǎn)品進行噴涂。

After curing, the product shall be air cooled, and the spraying mechanism shall spray the product.

脫模后的處理：

Treatment after demoulding:

我們做的是餐具，所以產(chǎn)品成型后要在一次性餐具模具中加熱120℃以上30-60分鐘，進一步凝固。后進行閃光打磨，完成一次性環(huán)保餐具的制作。

What we do is tableware, so after the product is formed, it should be heated in the disposable tableware mold above 120 ℃ for 30-60 minutes to further solidify. After that, flash polishing is carried out to complete the production of disposable environment-friendly tableware.

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