Medical Mold

 

• Medical Injection mold
• Medical plastic mould
• 1000USD start
• 20 days Minimum
• Product Description: Medical Plastic Mould at Injection Mold china, we provide you precision plastic injection mold solutions for your medical manufacturing project

Cn-moulding company is a professional plastic injection mold factory in shanghai, China. We are experts in various mold making, At present, Medical mould and part is our important field.

Below is the Spec. for medical plastic injection mould

Mould steel material	P20 , 718 , NAK80 ,S136 ,2344,H13,2311 etc.
Plastic material	PA , PE, PS ,PC, PP , PMMA , PET , ABS , PET.
Mould base	LKM, HASCO, DME
Mould runner	Cold Hot runner
Hot runner	DME, HASCO, YUDO
GATE	Pin gate, Edge gate, Sub gate, Fan gate
Mould component	DME, HASCO, LKM
Mould life	1 million shots
Engineering software	SolidWorks,UG-NX,Pro/e
Mould drop way	Gas Ejectors, Air-valves, hydraulic cylinder
Mould hot treatment	Tempering, Quenching , Nitriding
Machine Facility	CNC, EDM, Wire Cut
Mould shipment	SEA or AIR
Mould packing	WOOD /PALLET

Chart of our medical plastic injection mold step:

1. Receive the inquire from the customers, drawing or sample

2. Provide the quotation within 24 hours

3. Customer confirms the quotation and places the order

4. Prepare mold design and send to customer

5. Client approves the design

6. we order steel material and mold base

7. CNC milling, Drill holes, Wire cutting, EDM JOB

8. Hardened mold polish, assembly

9. Prepare mold test and send T1 samples out

10. Receive customer feedback

11. Adjust mold, repair, and make the texture

12. T2 sample for finally confirm

13. Forward arrange the mold shipping

As a professional china medical injection mold factory, we focus on precision mold manufacturing

our strongpoint of medical mould is High precision, long life and short cycle time and competitive price.

 

Different functions slider and angle pin

 

The slider

The slider is to solve the undercut (under-cut) and the development of the mold mechanism. The basic principle is to open and close the mold vertical movement, steering horizontal movement. And in order to cooperate with the male or female model barb position, and change the different forms of institutions. First to complete the lateral type, then top the product

 

The angle pin

Angle pin Is the mold design used to shape the barbs inside the product body, suitable for a relatively simple barb case.

Angle pin is to solve the undercut (under-cut) and the development of the mold mechanism. The basic principle is the same mold opening, and closing of the vertical movement, steering horizontal movement. The biggest difference between the angle pin and the slider is that the driving force of the action comes from the action of the thimble board. Not the action of opening and closing the male and female templates like a slider. Since the angle pin must utilize the thimble plate driving action. The design of the sloping top is related to the stroke of the thimble. Which is also the biggest difference between the sloping roof design and the slider design.


Generally in the angle pin and the slider can be done under the condition of the main selection slider. Slider processing is easier to control, and in the mold and its interference components are much less inclined. Such as the angle pin will interfere with the support Column, thimble, when the top of the ramp and the top of the ramp, with thimble and another top of the mechanism of interference .. Slope also affect the larger waterway, etc. In the assembly and removal of the slider is relatively convenient. The top is basically one of the mechanisms used when a slider is unavailable


The slider is a mold assembly capable of sliding perpendicular to the mold opening. And closing direction or at an angle to the mold opening and closing mold opening operation. When the product structure makes the mold without the use of the slider can not be normal demoulding the use of the slider. The material itself has the appropriate hardness, wear resistance. Enough to withstand the friction of exercise. The cavity on the slider or core part of the hardness of the mold cavity with the core of other parts of the same level.

Key Automotive Parts Produced in China

 China manufactures a wide range of automotive components, including:

 

1.   Engine Components

Cylinder heads, pistons, crankshafts, and camshafts.

Turbochargers and fuel injection systems.

 

2.   Transmission and Drivetrain Parts

Gearboxes, clutches, and drive shafts.

Differential systems and axles.

 

3.   Electrical and Electronic Components

Sensors, control units, and wiring harnesses.

Infotainment systems and displays.

 

4.   Chassis and Suspension Parts

Shock absorbers, springs, and steering systems.

 Brake systems (discs, pads, and calipers).

 

5.   Body and Interior Parts

Sheet metal components, bumpers, and doors.

 Seats, dashboards, and trim panels.

 

6.   Lighting Systems

LED headlights, taillights, and interior lighting.

 

7.   EV-Specific Components

Battery packs, battery management systems (BMS), and electric motors.

 Charging ports, inverters, and power electronics.

Advantages of China’s Automotive Parts Industry

1.   Cost Efficiency: Lower labor and production costs compared to many other countries.

2.   Scale and Capacity: Massive production capacity to meet both domestic and global demand.

3.   Supply Chain Integration: A well-developed supply chain with access to raw materials and components.

4.   Government Support: Strong government backing for the automotive industry, particularly for EVs and new energy vehicles (NEVs).

5.   Technological Advancements: Increasing investment in R&D, particularly in EV and autonomous driving technologies.

Trends Shaping the Industry

1.   Electric Vehicle (EV) Boom

China is the world’s largest EV market, driving demand for EV-specific components like batteries, motors, and power electronics.

The government’s push for NEVs (New Energy Vehicles) has accelerated innovation and production.

 

2.   Localization of Supply Chains

International automakers are increasingly sourcing parts locally to reduce costs and comply with Chinese regulations.

Domestic suppliers are expanding their capabilities to meet global standards.

 

3.   Smart and Connected Vehicles

Growing demand for advanced driver-assistance systems (ADAS), sensors, and connectivity solutions.

Chinese companies are investing heavily in autonomous driving technologies.

 

4.   Sustainability and Green Manufacturing

Emphasis on reducing emissions and adopting eco-friendly production methods.

Increasing use of lightweight materials like aluminum and advanced plastics to improve fuel efficiency.

 

5.   Digitalization and Industry 4.0

Adoption of smart manufacturing technologies, such as AI, IoT, and robotics, to improve efficiency and quality.

Digital platforms for supply chain management and production optimization.

 

6.   Export Growth

Chinese auto parts suppliers are expanding their presence in international markets, particularly in Southeast Asia, Europe, and North Americ

Mold Polishing Tips For Injection Molds

 

Mirror polish injection molds

 

What is mirror polishing?

Mirror polish injection molds refer to molds that have a highly reflective and smooth surface finish, similar to a mirror. This is achieved through a polishing process that removes any surface imperfections and creates a high-gloss finish.

Mirror polish injection molds are often used in applications where the final product requires a high level of clarity, such as in medical devices, optical lenses, and consumer electronics. The mirror-like finish helps to reduce the amount of light scattering and distortion, resulting in a clearer and more precise image.

The polishing process for injection molds is typically done using a series of abrasive compounds and polishing tools, starting with a coarse grit and gradually moving to finer grits until the desired level of mirror finish is achieved. The process can be time-consuming and requires a high level of skill and expertise to achieve the desired result.

Overall, mirror polish injection molds are a valuable tool for producing high-quality products that require a clear and precise finish.

[caption id="attachment_4629" align="alignnone" width="300"] Mold Polishing[/caption]

Mold Polishing Tips For Injection Molds:

① Surface after the rough polishing process by milling

EDM, grinding, etc. You can choose the speed at 35 000-40 000 rpm rotating surface polishing machine or ultrasonic grinding machine for polishing. Commonly used methods using diameter Φ3mm, WA # 400 wheel removing layers of white sparks. Then hand Whetstone grinding, strip Whetstone plus kerosene as a lubricant or coolant. The general order of use is # 180 to # 240 to # 320 ~ # 400 ~ # 600 ~ # 800 to # 1000. Whetstone polishing method. Which is the most important job a difficult job processed according to different specifications? And an angle of approximately 70 degrees a balanced cross lapping position? Ideally from a range of about 40 mm to 70 mm. Whetstone jobs will vary according to the material processed. Many mold manufacturers in order to save time and choose from # 400 to start.

② Semi-fine polishing semi-fine polishing mainly used sandpaper and kerosene.

After Whetstone's job is job sandpaper, sandpaper when the job. Pays attention to die Jen rounded edges, rounded corners, and orange peel generation. So try to make the finest Whetstone flow processing. Sandpaper polishing focus. Sandpaper with a hard stick like a stone like a job for about 70-degree angle to cross grinding. Polishing sandpaper side number about 10 times to 15 times. If the grinding time is too long, the grinding force of sandpaper will reduce. Which would lead to the machined surface uneven phenomenon? Which is also produced one of the reasons orange peel?

When jobs are generally used bamboo sandpaper grinding. Low stretch material actually used a small stick or rod hardness of about 45-degree angle grinding is the most ideal. The polished surface cannot be used as a rubber or a material with high elasticity. And cannot be polished with a 45-degree angle may be an acute angle shape. Numeral sandpaper as follows: # 220 ~ # 320 ~ # 400 ~ # 600 ~ # 800 ~ # 1000 to # 1200 to # 1500. Actually, # 1500 sandpaper only suitable for hardened tool steel (52HRC above) does not apply to pre-hardened steel. This may lead to pre-hardened steel surface burns.

③ Fine polishing diamond polishing paste mainly used.

If the powder or mixture of diamond abrasive grinding wheel pastes for polishing a polishing cloth. Then the order of the normal polishing 9μm (# 1800) ~ 6μm (# 3000) ~ 3μm (# 8000). 9μm diamond polishing paste and polishing cloth wheel can be used to remove the # 1200 and # 1500, leaving hair like sandpaper grinding marks. Then with sticky carpets and diamond polishing paste for polishing. The order of 1μm (# 14000) ~ 1 / 2μm (# 60000) ~ 1 / 4μm (# 100000).

Accuracy requirements in 1μm above (including 1μm) polishing process in the mold processing workshop in a clean polished interior can be carried out. If a more precise polishing an absolute necessity to clean the space. Dust, smoke, dandruff. And saliva Mo is likely to be scrapped after a few hours of work to get a high-precision polishing surface.

Cn-moulding is a reusable china injection mold company. We focus on high glossy mold manufacturing. One strong point of us is polished mold mirror and glossy, with short cycle time and competitive price.

Why injection molds use hot runner?

 After years of development, injection molds have become one of the preferred molds for manufacturing in all walks of life around the world, especially in the developed countries of Europe and the United States, which have advanced in the industry. The most important thing to mention is the use of hot runner technology in injection molds.

hot runner

1， Hot runner technology shortens the injection molding cycle

Because there is no limitation of the cooling time of the main channel and the secondary flow channel, the injection mold can be ejected in time after being solidified. Many thin-walled product molding cycles produced with hot runner molds can be completed in less than 8 seconds.

2，Eliminating subsequent processes is conducive to production automation.

After the workpiece is formed by the hot runner mold, it is the finished product. There is no need to trim the gate and recycle the cold glue lane. Conducive to production automation. Many foreign manufacturers have combined hot runners with automation to significantly increase production efficiency.

3， Hot runner technology saves plastic raw materials

In the traditional mold injection, the nozzle material is produced. The high plastic product is not allowed to use the water material (recycled secondary material). Because the reuse of the nozzle material will degrade the structure and performance of the plastic part, the reuse will affect the product quality. There is no cold runner in the hot runner mold. So no nozzle material is produced (fees are required). This is especially significant for applications where the price of plastics is expensive. In fact, the major hot runner manufacturers in the world have experienced rapid development in the world. When oil and plastic raw materials are expensive. Because hot runner technology is reducing materials and reducing materials. Fees, an effective way to save costs.

4，Expand the application of the injection molding process

Many advanced plastic molding processes have been developed based on hot runner technology. Such as PET preforming, multi-color co-injection in the mold, a variety of materials co-injection process

5， Reduce the defective products of injection molds and improve product quality

During the hot runner mold forming process, the plastic melt temperature is accurately controlled in the runner system. The plastic can flow into the cavities in a more uniform state, resulting in a consistent quality plastic part. The hot runner molding plastic parts have good quality, low residual stress after demolding, small deformation of plastic parts. And greatly improved the surface appearance of injection mold products. Therefore, many high-quality products on the market are produced by hot runner molds. Many familiar plastic parts, such as telephone casings, mobile phone cases, printer cases, computers, and automobiles, are produced using hot runner molds.

The factors affect the percentage of regrind materials

 

The factors affect the percentage of regrind materials

The factors affect the percentage of regrind materials

1, The purpose: In order to control and improve the quality of plastic parts, reduce the cost of plastic parts and injection molding plant regrind materials management, to meet customer technical requirements.

2, The scope: for the injection of all of the Company ABS, PA66, PA6, PP plastic parts, and workshop back to powder, processing, storage, labeling, and other management regulations.

3, Regrind material recovery and grade classification

1, Recyclable materials:

A.Defective products produced during injection molding (such as scratches, incomplete, burr) and other defective products.

B, injection molding process generated in the runner compound (nozzle material).

C, other (such as: engineering testing and other models can not be shipped demolition of plastic pieces or scrap pieces).

2, Regrind materials level:

A, The first regrind materials: the new material produced by the first injection of plastic.

B, The second regrind materials: after the second injection of plastic produced.

C, The third regrind materials: the second or more (including three) after injection of plastic and scrap.

The bulk density of the regrind is probably the single biggest factor affecting how much regrind one can use.

If you are using a recycled film scrap that hasn’t been densified then you pay a tremendous penalty in your rate. There are densifiers like a Munchy that will compact the film scrap to something close to a virgin pellet. In this case, then you can use quite a bit of scrap – 20 – 30%.

Another thing affecting your percentage of regrind is the use of grooved feed sections for extruders. They really are not designed for anything but pelletized material. It is best not to use more than 5% regrind if you have a grooved feed otherwise the grooves will clog and production rate will drop significantly and product quality will also suffer.

In blow molding, for instance, it is not uncommon for bottlers to use 35% regrind as the moels and tails comprise a considerable amount of material in relationship to the end product. That stuff is usually compressed and put back in the hopper.

Pre-hot runner systems had a lot of regrind as dense material sitting in the runners and gates was recycled. Those rates were quite high. I have seen that as high as 50%.

The other points are quite well such as contamination from streams and other things that need to be considered. In the end, I would say there is NO rule of thumb it greatly depends on so many factors.

There is no 1 rule of thumb. It will depend on several elements;

What type of Polymer and how they degrade (heat stability and moisture content)

whether filled and type of filler. Glass length will degrade making more brittle, lower modulus

whether it is a blend, PC: PBT interact with each other (transesterification)

can you add heat stabilizers, can increase the level of regrind

what kind of shear are you putting into the mix

you won’t try to color match or all bets are off on color stability

Ultem PEI is great, but high heat, I’ve seen >50% regrind work fine, unfilled PP of PE can go a long way with the addition of phosphate/phenol stabilizers.

 

plastic injection molding sink mark

 

The reasons for sink mark in plastic products are as follows:

Reasons for injection molding sink mark

Sink marks in injection molding are common defects that occur when the surface of a molded part shrinks and creates a depression or dimple. This typically happens because the inner part of the material cools and shrinks faster than the outer surface, pulling the surface inward. Sink marks are most noticeable on thicker sections of the part or near ribs, bosses, or other features that create variations in wall thickness.

Causes of Sink Marks:

1. Insufficient Cooling Time:

• If the cooling time is too short, the outer surface solidifies while the inner material is still cooling and shrinking, causing sink marks.

1. Inadequate Holding Pressure or Time:

• Holding pressure helps pack additional material into the mold to compensate for shrinkage. If the pressure or time is insufficient, the material shrinks excessively, leading to sink marks.

1. Excessive Wall Thickness:

• Thicker sections cool more slowly, increasing the likelihood of shrinkage and sink marks.

1. High Material Shrinkage Rate:

• Some materials, such as semi-crystalline plastics (e.g., polypropylene or nylon), have higher shrinkage rates, making them more prone to sink marks.

1. Improper Gate Location or Size:

• If the gate is too small or poorly located, it can restrict the flow of material, preventing adequate packing and leading to sink marks.

1. High Melt Temperature:

• Excessive melt temperature can increase material shrinkage as it cools, contributing to sink marks.

---

How to Prevent Sink Marks:

1. Optimize Wall Thickness:

• Design parts with uniform wall thickness to ensure even cooling. If thick sections are unavoidable, use coring or ribbing to reduce material volume.

1. Increase Holding Pressure and Time:

• Apply sufficient holding pressure and extend the holding time to pack more material into the mold and compensate for shrinkage.

1. Adjust Cooling Time:

• Ensure adequate cooling time to allow the entire part to solidify uniformly.

1. Use Low-Shrinkage Materials:

• Select materials with lower shrinkage rates, such as amorphous plastics (e.g., ABS, PC) or filled resins.

1. Optimize Gate Design:

• Use larger gates or position them near thicker sections to ensure proper material flow and packing.

1. Control Melt Temperature:

• Avoid excessively high melt temperatures to minimize shrinkage.

1. Add Mold Features:

• Incorporate mold features like gas vents or cooling channels to improve cooling efficiency and reduce shrinkage.

---

Corrective Actions for Existing Sink Marks:

• Increase holding pressure and time.
• Reduce melt temperature.
• Extend cooling time.
• Modify part design to reduce wall thickness or add coring.
• Adjust gate size or location.

By addressing these factors, you can minimize or eliminate sink marks and improve the quality of injection-molded parts.