Gas assisted molding|Gas assisted plastic injection molding technology-Sino

Gas assisted molding has widely used in plastic injection molding line, compared with traditional injection molding, gas assisting injection molding have many advantages.

1. Smaller of delete sink mark,

2. Lower injection pressure makes product internal stress smaller,

3. Smaller internal stress and bucking develops product size stability,

4. Will save up to 50% raw material,

5. Short cooling time leads production cycle time shorter,

6. Adopt short inject technology will make lower injection pressure and reduce the clamping force. Standard air injection pressure is 7-25 MPa.

Gas-assist molding technology procedure:

First stage: Polymer Filling

Polymer filling, form frozen layer in mold wall.

Second stage: Gas injection

Nitrogen was injected into polymer melt, push it go ahead to fill the cavity.

Third stage: End of has injection

Till filling the whole cavity and form gas channel

Forth stage: gas packing

In the stage of pressure holding, gas forcing the product from internal, make up volume contraction and hold product outside sizes.

Gas assist injection molding main method:

1. Volume control: according to expansion of hollow region, pressure inside decreases, but difficult to control multi profiled pressure pattern. Pressure decay effect is better than that of pressure control method.

2. Pressure control: be able to control continuous pressure. Easy to control multi profiled pressure step. Control method is similar with compact injection molding machine, but difficult to get smooth pressure decay effect.

3. Double control: be available to control two methods by users’ selection.

4. Hollow shot: melt inject into cavity, filling 60%~70%, then inject gas till hold pressure cooling molding. This technology always used for handle, hand shank and other thicker products, effect is very good.

5. Short shot: filling polymer melt 80%~90%, then inject gas. This method mainly used for larger plat and thicker product.

6. Full shot: filling the cavity with polymer melt totally, then inject gas. Melt volume shrinkage will form space, and gas will hold pressure to the melt. This method will reduce product deformed, mainly used for larger flat and thin wall products.

Gas assisted molding solution with superior difficulty; less company is professional in it. If you want to make gas assisted plastic injection molding line, welcome contact Sino, we will offer you a fine solution. 

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