How to tell the difference between injection and blow - moulded seat
How to tell the difference between injection and blow - moulded seat
A: blow molding and injection molding process principle
Blow molding is the extruded molten plastic blank, placed in the mold, with the help of compressed air blowing and affixed to the cavity wall, after cooling hardening for plastic parts; HDPE is mostly used for materials (as shown in the figure below).
How to tell the difference between injection and blow - moulded seat
Injection molding is to use the screw or plunger of the injection machine to make the molten material in the cylinder, through the nozzle of the injection machine, the pouring system of the mold, the injection cavity and solidification. Therefore, the compression resistance and toughness of the injection molding mold is better, basically using PP particle material. (Simple show the opinion below).
How to tell the difference between injection and blow - moulded seat
In other words: blow molding products are hollow, injection molding products are solid. The mold of injection molding is exquisite in texture, accurate in size and better in compression resistance. PP particles have good shaping degree, not easy to deform, strong flexibility, resistance, cold and heat resistance and other advantages, which is also the reason why injection molding is more popular.
Two: safety seat injection molding application and advantages and disadvantages
From the molding process we can see, blow molding is suitable for the production of products with simple structure, in the safety seat application such as can not adjust any part of the seat or through other ways to adjust the small Angle of the seat, and the removable seat is basically blow molding; And the injection molding process can be used for the structure of the more complex safety seat production, such as the head support position, horizontal rotation can be adjusted, can be adjusted to sit down, folding and other functions.
The advantages and disadvantages of blow molding:
Advantages: simple structure, the seat is relatively light; Cheap prices.
Disadvantages: the function is simple; The surface appearance is not very beautiful, the product grade is low.
Advantages and disadvantages of injection molding:
Advantages: accurate size and beautiful surface; The seat can achieve more functions; Comfort improvement; Enhanced resistance to pressure and impact
Disadvantages: the seat is heavy; The cost is high
Due to the low cost of blow molding process equipment, domestic low-end safety seats (including many middle-end foreign brands) are mostly used by blow molding process. Of course, many of these products have passed ECE testing.
Three: how to distinguish how to distinguish injection molding and blow molding of the safety seat
Blow molding products injection molding products
1, look at the material: generally look at the product is HDPE or PP material, you can roughly distinguish the product blow molding or injection molding, PP has the advantages of not easy deformation, good impact resistance, cold and heat resistance, injection molding is commonly used this kind of material, white is more beautiful, the price is more expensive. And blow molding is basically HDPE material, this product is cheaper, less material, black appearance is the main. Must ask chair figure qualitative when buying so.
2, look at the price: it can be said that the following 1500 safety seats are mostly used blow molding process, more than 1500 injection molding, of course, also do not rule out individual manufacturers mixed beads, with blow molding material to sell injection molding price. Because the cost of blow molding equipment is much lower than that of injection molding equipment, the second blow molding process is simple, the cost of mold development is low, of course, the use of materials is relatively cheap. The safety seat of injection molding is in more than 1500 above, the brand price of foreign country is higher.
3, look at the surface: blow molding product surface delicacy color degree is slightly less rough surface uneven, burr phenomenon. So blow moulded seats mostly use black plastic, the naked eye is not easy to find, if found to be black, we should carefully distinguish whether the blow moulded. Injection molded products have smooth surface, better texture than blow molded products, and better compression resistance than blow molded products. High-end safety seats will use white PP material, which can be more effective than black to prevent the secondary return of the material, because there will be black and gray spots in the plastic color of the return material. The use of black material can effectively avoid being identified. This is one of the reasons we recommend using more expensive injection moulded products. After all, peace of mind is the most important thing.
How to tell the difference between injection and blow - moulded seat
4, pay attention to the weight: blow molding parts because it is hollow, injection parts are solid, the weight is very easy to distinguish the elements. The net weight of the safety seat is more than 7.5kg, and the net weight of injection products is generally more than 10kg. Also note that there are businesses falsely labeled net weight, be sure to ask carefully.
5, look at the details: gear adjustment, generally speaking, blow molding structure is relatively simple, can adjust the place is not much, especially the tilt adjustment. Injection molds are assembled by a number of small molds, the structure is more complex, can achieve more functions, such as a number of height adjustment and multi - Angle adjustment.
How to tell the difference between injection and blow - moulded seat
6. Look at the all-in-one hard interface. The cost of the injection molding part itself is high.
7, the whole part injection molding and injection molding cannot confuse STH with STH else: here can provide some simple identification method, cannot end, on the professional market is variant, "smart" merchants times out, blowing a pretend to be injection molded parts, and more recently also appear on the market a lot of injection molding and blow molding parts as the combination of injection molding products, low-end product selling price, really uncool! As a seat, full injection molding refers to the plastic structure of the chair body are injection molding products, rather than a small part using PP full injection molding, can be called injection molding products.
The seat of injection molding is safer, more comfortable, more functional, more high-grade appearance, of course, the price is also higher. Even if the choice of blow molding, we must choose professional manufacturers, through the safety test of the brand, both can be carried out according to personal circumstances to choose and buy, but we must not pay undeserved money.
Injection Molding Information