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Notice when buying plastic injection molding machine

Author:HaiflyMachinery Date:2011-11-26 19:41:26

Notice when buying plastic injection molding machine

At present,there are many manufacturers who produce plastic injection molding machine,and the styly,specification and quality of machines are different in market.The user who wants to buy the machine should select the specification and the style of plastic injection molding according to the product which he want to product which he want to produce,colligating the view of present benefit and future long benefit.Showing in details,user should select the machine from following ways:

A)The use performance of the product to be produced
B)The quality requirement of the product to be produced
C)The material,size,weight of the product to be produced
D)The total ourput the buy want in one year,etc.
(For example,the user should have different purchase plan when he want to produce common plastic toy or produce top grade home electrical plastic product).


Following introduce the purchase way of plastic injection molding machine from the important technical data and the important composing parts.

A.The shot weight:
The max.shot weight of PS plastic is one of common use parameters for plastic injection molding machine.When the raw material isn't PS plsatic ,the shot weight must be after conversion.According to the practice experience,the total weight of product had better been controller under 85% of shot weight,you can choose the big value when the plastic is no-crystal;while choose the small value for the high viscidity plastic.
B.Clamping mold force
The definition of clamping mold force is the final clamping mold force of the mold board to the mold when finishing clamping the mold and the melt plastic being injected into the mold cavity,which is one of most common use parameters for plastic injection molding machine.There will be phenomenon of fly-wing if the clamping mold force isn't enough,so please confirm the clamping mold force of the product to be produced is less than the clamping mold force of the machine purchaseing.The clamping mold force can be calculated by folloing for formula:the average pressure in the mold cavity*projection proportion of mold cavity.Among the above formula,generally,the average pressure of mold cavity is 20-40 Mpa,and this value will be changed according to different plastic feature,product requirement and product flowing ratio.The exact clamping mold force can be calculated by computer simulation

C.Injection pressure and injection rate.
D.Mold thickness(Min-Max) and stroke of moving platen.
E.The correlative dimension of installion mold
F.Screw and barrel
G.Ejector stroke
H.Special computer for plastic injection molding machine
I.Hydraulic pressure system