你知道生物降解材料擠出造粒的外觀如何嗎？實(shí)際上要了解這個(gè)問題，我們可以從3個(gè)方面來進(jìn)行講解：

Do you know the appearance of extrusion granulation of biodegradable materials? In fact, to understand this problem, we can explain it from three aspects:

1.生物降解顆粒兩端的有孔問題：

1. Porosity at both ends of biodegradable particles:

兩端都有孔：說明料里含的低分子物質(zhì)戒水份較多，真空排氣沒抽干凈戒原料含的低分子戒水成分較多。

There are holes at both ends: it indicates that the material contains more low molecular weight water repellent substances, and the vacuum exhaust is not clean. The material contains more low molecular weight water repellent substances.

只有一端有孔：說明料里含的低分子物質(zhì)戒水份較少，沒有嚴(yán)格要求時(shí)可以接受。

Only one end has holes: it indicates that the low molecular substances in the material contain less water repellent, which can be accepted without strict requirements.

解決：前處理（干燥、密封等）；加強(qiáng)真空排氣（同時(shí)要考慮到螺桿設(shè)計(jì)）；提高水槽溫度。

Solution: pretreatment (drying, sealing, etc.); Strengthen the vacuum exhaust (at the same time, consider the screw design); Raise the temperature of the sink.

2.生物降解顆粒發(fā)泡：

2. Biodegradable particle foaming:

出現(xiàn)多個(gè)孔，或者表面粗糙真空度不夠；溫度過高，原料成分的分解等。 原料含水分過高； 原料（較差的副牌料）不耐溫或成分使用不當(dāng)，相互間化學(xué)反應(yīng)而發(fā)。

Multiple holes appear, or the surface roughness and vacuum degree are insufficient; High temperature, decomposition of raw materials, etc. The moisture content of raw materials is too high; The raw materials (poor sub brand materials) are not temperature resistant or the ingredients are improperly used, resulting from chemical reactions between them.

3.顆粒表面光滑平整問題：

3. The particle surface is smooth and flat:

顆粒表面光滑平整，要看所用的原材料的成分——玻纖、 無機(jī)礦物、表面較粗燥的阻燃劑等物質(zhì)。但相比對下， 同個(gè)料批次有差異，原因有：

The particle surface is smooth and flat, depending on the composition of the raw materials used - glass fiber, inorganic minerals, flame retardants with rough and dry surfaces, etc. However, there are differences in the same material batch compared with the following reasons:

① 塑化混煉不好，交叉分布不夠細(xì)加工溫度不夠,塑化不好；② 機(jī)器問題，如?？撞黄秸⒉粔蚬饣?；③ 原料成分間相容性不好（也包括色粉色母在內(nèi)），出現(xiàn)分層、析出等。

① Poor plasticizing and mixing, insufficient cross distribution, insufficient fine processing temperature, poor plasticizing; ② Machine problems, such as uneven die holes and insufficient smoothness; ③ The compatibility between raw material components is not good (including pink mother), and delamination and precipitation occur.

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