Automotive zip tie moisture absorption and toughening treatment box

Automotive zip tie moisture absorption and toughening treatment box

modified nylonThere are many categories that can be adjusted according to customer requirements, such as fiberglass reinforcement, flame retardancy, toughening, etc. However, sometimes modification alone cannot achieve our expected results, so we need tomodified nylonThe product has been humidified, in simpler terms, it means' boil it 'and absorb moisture.

If the product is not "cooked", it is also possible to save time by storing it in the warehouse for a period of time, but this process is relatively slow, taking about three months or more. Nylon injection molded parts will slowly absorb moisture from the air until they reach moisture balance without being processed.

So why do we need to carry out humidity control treatment?

Because the repeating units on the main chain of nylon molecules contain polar amide groups, which can form intermolecular hydrogen bonds, resulting in strong intermolecular interactions and thusmodified nylonHas high mechanical strength.

The amide groups on the main chain are water absorbing groups, and the lower the density of amide groups on the main chain, the higher the water absorption rate. At the same time, water has a significant impact onmodified nylonIt is a plasticizer. After absorbing water, nylon breaks the hydrogen bonds between molecules, weakens the interaction forces between nylon molecules, and plays a role in plasticizing, resulting in a decrease in the strength and modulus of nylon. The toughness of nylon is enhanced after water absorption because the structure of nylon becomes more stable after water absorption, resulting in increased toughness.

Generally, humidity control treatment is not only for toughening, but also for ordinary PA6 and PA66, which have strong water absorption properties. Water absorption can cause changes in performance. Only by achieving moisture absorption equilibrium under the temperature and humidity of the usage environment can more stable mechanical properties be obtained, thus making the product more stable in a short period of time

Since humidity control treatment can improve the toughness of products, it can also be fully applied, such as in purchasingmodified nylonWhen selecting particles, choose materials without toughness, such as fiberglass reinforced nylon or filled nylon, which are cheaper. After injection molding is completed, "water boiling" is carried out to improve toughness, and the final product has both strength and toughness, which is also a good choice.

Sometimes humidity control is also a last resort, for example, if there is a work error during the production process and the product is slightly brittle, in order to cover up this defect, increasing toughness can also be used to make up for it. However, this kind of compensation is only a minor adjustment. If the brittleness is too large, rework is needed.

Nylon 6 has a high water absorption rate, and its mechanical properties reach their optimum when the moisture content is between 1.5% and 2.5%. In fact, all highly absorbent engineering plastics, from PA6 to PA46, PPA, PA610, etc., can only achieve optimal and stable performance after humidity controlThe state!

The method of humidity control can be to place the parts in a sealed PE plastic bag, add 2-5% moisture and seal for 10-20 hours. It can be stored for a period of time under relatively stable conditions of room temperature and humidity, or the injection molded parts can be directly placed in warm water, or special humidity control equipment can be used for humidity control. Building a specialized humidity control box using high-temperature steam can greatly save humidity control time and achieve more precise water absorption control.

However, there are many details that are easily overlooked when adjusting the humidity of nylon 6 modified parts. Different modified materials have varying wall thicknesses and sizes, as well as different equipment and methods for humidity control, resulting in different equilibrium times for the products. Fiberglass reinforced nylon 6 has a low saturation water absorption rate, relatively minimal size change rate, and much less humidity control time. PA6 flame retardant and PA6 toughened parts have relatively longer humidity control time.

PA6 modificationFor every 1% increase in water content in injection molded parts, the volume size will increase by 0.05-0.2%. In cases where high dimensional accuracy is required, this should be fully considered in mold design. The size, mechanical properties, and TDS of the same component must be distinguished between dry and wet states!

Automotive zip tie moisture absorption and toughening treatment box

This equipment adopts the humid air method for processing nylon zip ties for humidification products.

Previous process：

1. The post-treatment of nylon material products is usually carried out by boiling in a large water tank, steaming in a large rice cooker, steaming in a boiler, and other methods. Usually several processes are required to complete. Not only does it consume a lot of energy, but using coal to burn boilers is also not environmentally friendly; Especially in autumn and winter, it causes great losses and waste;

2. The processed PA product has white spots of scale on the surface, and the corners and corners of the product structure are crystalline scale, which is extremely difficult to treat; Often, workers are organized to wipe the products before shipment packaging, and small parts cannot be cleaned completely;

3. After processing the product in autumn and winter, it still feels brittle; Unable to effectively control the water absorption rate of PA material products, it took a lot of effort to boil water and wipe the selected products, but when they reached the customer's hands, they were still complained about or even broken;

KUKA Intelligent DevelopmentAutomotive zip tie moisture absorption and toughening treatment box：

1. Product water treatment has become simple and efficient, allowing PA products to solve water absorption and toughening problems in one stop (product put in - take out);

2. Controllable moisture content: A user-friendly controller can assist in management, ensuring consistent moisture content of products produced throughout the year;

3. Clean appearance: The processed product does not require secondary wiping after post-processing and can be directly packaged and shipped;

4. Labor saving: 50-100 injection molding machines, all product water treatment processes can be solved by only one person; If there are few injection molding machines, only feeding workers or injection molding machine operators need to assist in solving the problem, without the need for dedicated personnel; Greatly reduce the labor costs of enterprises.

5. Energy saving: After the equipment works normally for about 20 minutes and reaches a stable state, the operating power is only about 15% of the rated power of the equipment;

6. Efficient: Products processed with this device set at a temperature of 60-80 degrees Celsius and humidity above 85 degrees Celsius have better moisture absorption and efficiency than those directly boiled in water; Adjusting time and temperature can greatly improve the product processing efficiency of enterprises.

7. Can save a lot of labor and space: The products are automatically humidified and dried, and there are no residues on the surface of the products. Without requiring too much production lead time, it greatly reduces the inventory of work in progress, effectively reduces enterprise financial risks, and concentrates a large amount of warehouse space.

8. Enhancing the overall strength of the enterprise: The equipment data adopts curve management, which can provide customers with effective and intuitive data processing and product moisture content data.

Temperature setting range: normal temperature~90 ℃

Humidity setting range: 50%~98%

Water absorption rate: 2%~4.5%

The water absorption weight can be easily calculated, easy to operate, highly reproducible, and the process is stable.