濟（jì）南注塑（sù）加工（gōng）中的收縮是注塑加（jiā）工（gōng）中很常見的一個問題，尤其是對表麵質量要求（qiú）高的塑料製品。因此（cǐ），隨著注塑加工技（jì）術的不斷提高，大限度地減少注塑加（jiā）工的收縮，提高產品質量勢在（zài）必行。
Shrinkage in injection molding is a common problem in injection molding, especially for plastic products with high surface quality requirements. Therefore, with the continuous improvement of injection molding technology, it is imperative to reduce the shrinkage of injection molding and improve the product quality.
在塑料零（líng）件較厚部分(如筋或突起)形成的收縮（suō）比相鄰部分更嚴重。這（zhè）是因為較厚部（bù）分的冷卻速（sù）度（dù）比（bǐ）周圍區域慢得（dé）多。不（bú）同（tóng）的（de）冷卻速度會導致結合麵形成凹陷，稱為縮痕。
Shrinkage formed in thicker parts of plastic parts (such as ribs or protrusions) is more severe than that in adjacent parts. This is because the cooling speed of the thicker part is much slower than that of the surrounding area. Different cooling speeds will lead to the formation of depressions on the joint surface, which is called shrinkage marks.
這種（zhǒng）缺陷嚴重限（xiàn）製了塑料製品（pǐn）的設計（jì）和成（chéng）型（xíng），尤其是大型厚壁（bì）製品如電視斜盒（hé）、展示盒等。實際上，家電等要求嚴格（gé）的產品是需（xū）要去除縮孔的，而玩具（jù）等一些表（biǎo）麵質量要求不高的產品，在注塑加工時是允許有（yǒu）縮痕的。
This defect seriously limits the design and molding of plastic products, especially large thick wall products such as TV slant boxes and display boxes. In fact, household appliances and other products with strict requirements need to remove shrinkage holes, while toys and other products with low surface quality requirements are allowed to have shrinkage marks during injection molding.
形成注塑加工（gōng）縮（suō）痕的原因可能有一個或多個，包（bāo）括加工方法、零件幾何形狀（zhuàng）、材料選（xuǎn）擇和（hé）模具設計等。幾何形狀（zhuàng）和材料選擇通（tōng）常由原材料供應商決定，不能輕易改變。然而，在模具製造商中，有許多與（yǔ）模具設計相關的因素可能會影響注塑加工的收縮率。
There may be one or more reasons for forming shrinkage marks in injection molding, including processing method, part geometry, material selection and mold design. Geometry and material selection are usually determined by the raw material supplier and cannot be easily changed. However, in mold manufacturers, there are many factors related to mold design that may affect the shrinkage of injection molding.
冷卻流道、澆（jiāo）口類型和（hé）澆口尺寸的（de）設計（jì）可能會產生不同的效果（guǒ）。例如，小型澆（jiāo）口（kǒu），如管狀（zhuàng）澆口，冷（lěng）卻速度比錐形澆（jiāo）口快得多。澆口過早冷卻會減少型腔的填（tián）充時間，從而（ér）增加（jiā）縮痕的可能性。
The design of cooling runner, gate type and gate size may have different effects. For example, a small gate, such as a tubular gate, cools much faster than a conical gate. Premature cooling of the gate will reduce the filling time of the cavity, thus increasing the possibility of shrinkage marks.
對於成（chéng）型工人（rén）來說（shuō），調整加工條件是注塑加工（gōng）中收縮問題的一種方（fāng）法。填充壓力和時間顯著影響（xiǎng）收縮率。
For molding workers, adjusting the processing conditions is a way to solve the shrinkage problem in injection molding. Filling pressure and time significantly affected the shrinkage.
零件填充後，多餘的材料繼續填充到型腔中，以補償材料的收縮。如果填充階段過（guò）短，收縮會加劇，終會產生更多或更大的縮痕。這種（zhǒng）注塑加工本身收（shōu）縮的（de）方法可能無法將縮痕減少到令人滿（mǎn）意的程度，但成型工人可以調整填充條件來改（gǎi）善縮痕。
After the part is filled, the excess material continues to fill into the cavity to compensate for the shrinkage of the material. If the filling stage is too short, the shrinkage will be intensified and more or larger shrinkage marks will be produced. This method of solving the shrinkage of the injection molding process itself may not reduce the shrinkage mark to a satisfactory degree, but the molding workers can adjust the filling conditions to improve the shrinkage mark.
This is the end of the notes on shrinkage during injection molding. You can visit our website http://www.lsjtcyjt.cn Consult more about the operation, attention and problems during injection molding.
