一. Choosing the right materials and matching them with the mold
1.Polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), and polycarbonate (PC) are all high-performance medical polymers that are often used in medical pipeline joints. The main reason for choosing these materials is to make sure that the parts are safe and last a long time in medical settings. Some of the prerequisites are:The material must meet international medical standards like ISO 10993 and USP Class VI to make sure it doesn't offer any chemical or biological risks to people.
2.Finding the right mold materials
Choosing the right plastic mold materials is just as crucial. P20, H13, and S136 are some common mold steels. To make sure the mold can do its job, it needs to be very rigid, resistant to wear, and resistant to corrosion.Adapt to the process of injection molding medical polymers that can handle high temperatures.When mold materials and component materials are matched correctly, it can lower scrap rates, make molds last longer, and speed up production.
二,Structure of the Injection Mold
1.The mold design for medical pipeline joints must consider the intricate interior cavity configuration, flow channel arrangement, demolding efficiency, and component precision.Design of the mold cavityMost of the time, medical pipeline joints feature complicated internal cavities and walls that are very different in thickness. When making mold cavities, keep the following in mind:
2.Uniform wall thickness: If the walls are not the same thickness, they may distort, bubble, or shrink. To avoid this, the cavity design should be tuned to control the variances in wall thickness.Smooth inner cavity: The locking ring and internal flow channel of the joint need to be demolded smoothly so that the parts don't break or get trapped.Good structure: To make sure the melt flows evenly and to cut down on short shots or flying edges, stay away from abrupt corners and irregular transitions.
3. Designing the pouring systemGate position: It should stay away from the sealing and functioning surfaces so that the joint performance isn't affected
三. Design of the classification surface
1.The position of the parting surface has a direct impact on how well the parts seal and how they look:To minimize damaging the sealing effect, the separation surface should be chosen in areas that don't need to be functional as much as possible.The process of injection molding and how to regulate it preciselyThe performance and dependability of medical pipeline joints depend directly on the injection molding technique and precision. Settings for the injection molding processInjection temperature: Set the melt temperature based on the properties of the material to make sure it flows and fills completely.
2.Speed and pressure of the injection: Fill the cavity uniformly to avoid short shoots, bubbles, and burrs.Holding pressure and cooling time: Make sure the parts stay the same size, and don't shrink or deform.Control of dimensional accuracyThe inner diameter, outer diameter, and wall thickness of medical pipeline joints are very important for how well they seal:
The difference between the inner and outer diameters is normally kept between 0.05 and 0.1 mm.The exact placement of the checkpoint and locking ring makes sure that the pipeline is put together in a stable way.To keep leaks from happening, the sealing surface is level and has no burrs.
3.Tolerance and TestingTo measure important dimensions, use a Coordinate Measuring Machine (CMM) or an optical projector.You can set up online testing for important parts to make sure that each batch is the same.ISO or FDA medical device-related tolerance standards must be met by injection molded parts.
四. Quality of the surface and after-treatment
1. How smooth the surface isTo make sure there are no leaks, the sealing surface normally needs Ra 0.8 to 1.2 μ m.
2. Cleaning and removing burrsThe design of the mold needs to get rid of burrs and needle marks.To make sure they are safe for medical use, the parts need to be cleaned and deburred once they are injection molded.
3. Processing againDrilling, hot cutting, or ultrasonic welding can be used on special purpose joints.To avoid changing the structure of the parts, it is important to set aside room for processing in the mold design stage before secondary processing.
五. Optimizing production efficiency using multi-cavity molds
To make more medical pipeline joints, multi-cavity molds are commonly used. make sure that the sizes of each cavity part are the same, the flow channel and exhaust system need to be constructed in a way that is balanced.Improving the cooling system can make the cycle time shorter and make sure that parts are accurate and stable.
