生物降解材料挤出造粒的外观如何

你知道生物降解材料挤出造粒的外观如何吗？实际上要了解这个问题，我们可以从3个方面来进行讲解：

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.生物降解颗粒两端的有孔问题：

1. Porosity at both ends of biodegradable particles:

两端都有孔：说明料里含的低分子物质戒水份较多，真空排气没抽干净戒原料含的低分子戒水成分较多。

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：说明料里含的低分子物质戒水份较少，没有严格要求时可以接受。

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.

解决：前处理（干燥、密封等）；加强真空排气（同时要考虑到螺杆设计）；提高水槽温度。

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

2.生物降解颗粒发泡：

2. Biodegradable particle foaming:

出现多个孔，或者表面粗糙真空度不够；温度过高，原料成分的分解等。 原料含水分过高； 原料（较差的副牌料）不耐温或成分使用不当，相互间化学反应而发。

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.颗粒表面光滑平整问题：

3. The particle surface is smooth and flat:

颗粒表面光滑平整，要看所用的原材料的成分——玻纤、 无机矿物、表面较粗燥的阻燃剂等物质。但相比对下， 同个料批次有差异，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 塑化混炼不好，交叉分布不够细加工温度不够,塑化不好；② 机器问题，如模孔不平整、不够光滑等；③ 原料成分间相容性不好（也包括色粉色母在内），出现分层、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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