Common injection molding defects of polypropylene (PP)!

1. Short injection Failure analysis and troubleshooting methods:(1) Improper control of process conditions. Should be adjusted appropriately.(2) Injection capacity of injection molding machine is less than weight of plastic part. A larger injection molding machine should be used.(3) Cross section of runner and gate is too small. Should be increased appropriately.(4) Flow distance of melt

Seven systems of plastic molds

It refers to part of runner before plastic enters cavity from nozzle, including main runner, cold slug well, runner, gate, pull pin, etc. Second system: temperature control system Temperature control system: In order to meet mold temperature requirements of injection process, a temperature control system is required to adjust temperature of mold. For injection molds

High-gloss injection molding technology: creating a “glossy appearance” for injection mold

How to produce shell products with no melt marks, no flow marks, no flow lines, no sink marks, and high gloss surface is particularly important for flat-panel TVs, computer LCD monitors, air conditioners, and automotive interior parts. Use of high-gloss injection molding technology can solve this problem well. Process principle of high-gloss injection: Mold is

How to choose injection molding machine nozzle?

Basic form of nozzles: nozzles can be divided into straight-through nozzles, locked nozzles, hot-runner nozzles and multi-runner nozzles.Straight-through nozzle is a commonly used nozzle. Its characteristic is that spherical surface of nozzle directly contacts spherical surface of main casting sleeve of mold. Arc radius and runner of nozzle are smaller than that of mold. During injection,

Multi-stage injection and segmented injection plastic flow principle of injection molding machine

1. Multi-stage injection plastic flow principle: 1. First shot glue is fed at a low speed, move nozzle to cold head, then increase second shot speed to fill cavity to shorten time for plastic at gate to flow to end, so that viscosity of plastic in filling is maintained to a minimum solidification. However, it is

Main runner and sub runner of mold

Main runner, sub runner and gate function are to transport plastic melt from nozzle of injection molding machine to each cavity. It is true that aggregates of gating system can be crushed and reused. However, presence of aggregates means that productivity of injection molding machine is reduced, because material in gating system must also be plasticized in

Design of injection mould for guide vane of curtain bead automatic machine

When designing an injection mold, demolding method affects mold structure. Main manifestation is that selection of parting method needs to consider convenient demoulding of plastic part, simple mechanism and convenient processing of mold parts. When plastic part has multiple characteristics and demolding direction is different, if conventional sliding block, inclined push rod and other mechanisms

How many of these injection molding machines have mold opening failures?

1. Injection molding machine can’t open mold again. There is pressure, speed, oil to cylinder, and pressure is 120kg. Why do you often cannot open mold? 1 Is oil seal of mold opening cylinder damaged?2 Is mechanical part of clamping mechanism stuck?3 Check mold opening valve; see if spool is not in place?4 Are speed, pressure,

Structural characteristics and maintenance analysis of hydraulic system and cylinder of injection molding machine

Equipment that uses plastic molding molds to make thermosetting plastics or thermoplastics into plastic products of various sizes, forms, and uses is an injection molding machine. In order for an injection molding machine to complete its main function of making plastic products, it must require hydraulic control part of injection molding machine to perform its

Mold replacement instructions

Section 1 Preparation before mold change  According to production plan of workshop, make preparations before changing mold. 1. Put on a safety helmet, prepare mold removal tools such as rags, rust inhibitors, and wrenches; 2. Check mold to be installed: (1). According to layman’s size of mold, choose machine that can be installed (in general, machine