In the field of plastic mold manufacturing, every detail of a high – quality mold must be meticulously controlled. As a professional plastic mold manufacturer, when we receive product drawings from customers, a professional and detailed analysis begins. Among them, the analysis of the shrinkage problem of plastic products is undoubtedly crucial and indispensable. So, how do the engineers of Yize Mould take precise measures in actual operations?
Initial Exploration of Shrinkage Causes
After conducting an in – depth analysis of the product drawings provided by customers, we found that the causes of shrinkage in plastic products may include the following:
Wall Thickness Factor
The excessive wall thickness of the plastic product itself is a common cause of the shrinkage problem. The uneven internal stress distribution during the cooling and shrinking process of the overly thick plastic easily leads to shrinkage.
Molding Temperature Factor
A high molding temperature can also cause shrinkage problems. In a high – temperature environment, the fluidity of the plastic raw material increases. However, during the cooling process, the areas that cool easily solidify first, and the raw material in the difficult – to – cool areas moves towards the solidified areas, resulting in shrinkage at the thick – walled and raised parts.
Targeted Solutions
Design Optimization Based on Wall Thickness
When solving the shrinkage rate problem of plastic products, our designers will carefully prepare an analysis report based on the wall thickness of the plastic products and present it to the customers at the beginning of the design process. In the report, we will detail the pros and cons of different wall thickness designs and provide professional advice. For example, we suggest that the thickness of the rib should be 0.5 to 0.6 times that of the main wall thickness. Through such design optimization, the occurrence of shrinkage problems can be reduced to a certain extent.
Molding Temperature Regulation
For the shrinkage problem caused by a high molding temperature, we have two effective solutions. On the one hand, during the mold design stage, we try to set the areas where shrinkage may occur in regions that do not affect the quality of the finished product. On the other hand, in actual production, we appropriately lower the molding temperature to reduce the uneven flow of raw materials caused by temperature differences, thereby controlling the shrinkage phenomenon.
New Findings During the Trial Molding Process
During the actual trial molding process, we also discovered other causes of shrinkage in plastic products:
Gate – related Problems
A small gate size restricts the flow of plastic raw materials into the mold, resulting in insufficient filling of the raw materials and leaving shrinkage marks on the product surface. In addition, if the gate is too far from the thick – walled area, the raw materials will cool prematurely during the flow process and cannot fully fill the thick – walled area, causing shrinkage.
Precise Responses to Gate – related Problems
For the problem of a small gate size, our engineers will decisively suggest increasing the gate size. At the same time, when debugging the injection molding machine, we will appropriately increase the gate pressure to ensure that the plastic raw materials can enter the mold smoothly and sufficiently. For the shrinkage problem caused by the gate being too far from the thick – walled area, the engineers will suggest placing the gate closer to the thick – walled area to reduce the heat loss of the raw materials during the flow process and ensure that the raw materials can fully fill the thick – walled area.
Confidence in Facing Diverse Challenges
In actual production, the causes of shrinkage in plastic products may be far more than the above – mentioned ones. Behind each shrinkage problem, there may be complex factors. This requires us to analyze specific problems specifically, using professional knowledge and rich experience to find the root cause of the problem.
We are never afraid of problems because we have firm confidence and strong capabilities to solve them. Behind this is the quiet support of a professional team. They have solid professional knowledge, rich practical experience, and a patient and meticulous work attitude. It is these precious qualities that give us enough confidence to meet more difficult challenges and create high – quality plastic products for customers.
Dongguan Yize Mould Co., Ltd. was founded in 2007, is headquartered in the manufacturing capital of Dongguan. We are engaged in many years in the design and manufacture of precision molds and precision medical injection moulding products manufacturer, the company focuses on the automotive connectors, medical products medical injection moulding, dust-free plastic medical injection moulding, custom medical injection moulding of PFA products such as design, precision mold manufacturing, medical injection moulding and assembly, after-sales service as a whole set of solutions. You can contact us via Email at [email protected] or WhatsApp +86 13302615729 !
