【尼龍制品】的調(diào)濕處理

1、吸濕性 Moisture absorption

剛頂出的注塑制品幾乎不含水分。這點對于塑件以后的應(yīng)用很重要，因為FRIANYL?-尼龍只在水分含量為大約1.5 – 2.5 %時，各項機械性能達到要求。因此，注塑制品都需要調(diào)濕。

Injection mouldings that are ejected out of the mould have almost no moisture content. This is very important to recognize this for future applications for the moulding. FRIANYL?-polyamides only

attain their optimum mechanical properties after moisture equilibrium has been reached at about 1.5-2.5%. For this reason the injection mouldings should always be conditioned.

吸濕性取決于結(jié)晶度。非結(jié)晶區(qū)吸濕更快，這就是為什么強調(diào)調(diào)整工藝參數(shù)，務(wù)必使結(jié)晶均勻的原因。

Moisture absorption depends on the crystallinity. Amorphous areas absorb moisture faster. That's why one should aim for an even crystallinity, which is achieved by the processing parameters.

吸濕速度由FRIANYL?-牌號，環(huán)境濕度，以及塑件的壁厚共同決定。

The rate of moisture absorption is dependent on the FRIANYL?-types, the environmental conditions,and the wall thickness of the mouldings.

請參見后面的調(diào)濕表。

See attached conditioning table

尼龍制品http://www.greatyht.com/應(yīng)該注意到，塑件的水分含量每增加1%，塑件的體積會增加0.05-0.2%。對于要求尺寸精確的塑件，這點特別要注意。

It has to be noticed, that with a 1% increase in water content in the moulding it's volume increases by about 0.05-0.2%. This is of special significance for mouldings with tight dimensional tolerances.

2、飽和吸水率 Water absorption-saturated

FRIANYL?-尼龍的飽和吸水率取決于具體牌號，一般在7-9%之間。壁厚和水溫決定吸水速度。

The saturated water absorption of FRIANYL?-polyamides depends mainly on the material type and ranges as a rule is between 7-9%. The speed with which this happens depends, too on the wall thickness and the water temperature.

參見下述調(diào)濕表。

See attached conditioning table.

NILIT(屹立）FRIANYL? 尼龍的調(diào)濕表

Conditioning table for FRIANYL? Polyamides

① ISO – 1110 規(guī)定的NK 23/50 條件下的標(biāo)準(zhǔn)調(diào)濕條件。

備注：在壁厚一欄，沒加下劃線的為小時數(shù)，加了下劃線的為天數(shù)。僅供參考。

According to ISO-1110 for the conditioning of standard test bodies to the standard moisture content in NK 23/50 Conditioning time in hours/days for the adjustment of the water content equilibrium in normal humid air when stored for flat parts (plates) in FRIANYL?.

水滲透的過程符合物理學(xué)上的吸水規(guī)律，這就是說，靠自然氣候本身調(diào)濕是天然和最經(jīng)濟的辦法，但是在室溫和通常氣候下，吸濕過程是非常緩慢的。

The water delivery process is subject to the same physical rules as the water absorption. This means that for practical purposes climate- and weather variations can be neglected because water absorption and - delivery do at least at room temperature and normal climate happen very slowly.

和上述1一樣，吸水時也要考慮相應(yīng)的體積變化。

Increase of volume has to be taken into consideration see point 1 also concerning the water absorption.

3、測試水分含量  Determination of the moisture and water content

對塑件制造商來說，簡單稱量調(diào)濕前后尼龍塑件重量的增加來測算水分含量，就已經(jīng)夠了。要更精確測量的話，可以使用紅外干燥法，和實驗室常用的Karl-Fischer-Titration(KT-Titration)方法。

For the manufacturer it is sufficient to determine the moisture content in PA parts by establishing the increase in weight simply by weighing the parts before and after conditioning. Further more precise measurement methods are infrared drying and Karl-Fischer-Titration (KT-Titration), which is the usual method in labs.

4、調(diào)濕Conditioning

調(diào)濕的目的是在注塑廠賦予塑件日后使用所需要的性能。

The purpose of conditioning is to impart in the moulding whilst still in the moulding company the properties that the part will require later.

FRIANYL?-尼龍在水分含量1.5 – 2.5 %時達到其特定的性能。因為調(diào)濕過程，隨不同工藝，要花費時間和成本。客戶需要針對特定應(yīng)用，在調(diào)濕之前要考慮是不是有必要。

FRIANYL?-polyamides attain their specific property values with a moisture content of 1.5-2.5%.Because the conditioning process is, depending upon the chosen procedure, expensive and timeconsuming,one should first consider whether a particular case really requires conditioning.

如果決定要調(diào)濕，以下有幾個不同的選擇，可根據(jù)情況參考：

Should one decide in favour of conditioning then there are several options available which can be selected for different reasons:

塑件封入PE 包裝袋，添加2-5% 的水分Packing in PE-bags with the addition of 2-5% Water

確定室溫下和通常環(huán)境濕度下的儲存時間

Defined storage time at room temperature and normal environment moisture

在注塑好之后，直接置入溫水中Storage in warm water directly at the injection moulding machine

使用市售的專門調(diào)濕設(shè)備With special conditioning devices, which are available on the market

建造調(diào)濕室，內(nèi)設(shè)濕熱蒸汽Purpose built conditioning chambers with steam or tropical climate

塑件調(diào)濕的一個先決條件是要明確需要的水分含量，然后確定調(diào)濕時間。A prerequisite for controlled conditioning of mouldings is the supervision of the moisture content andestablishing the conditioning time.