In actual application, there are lots of examples that applying GAIM techniques improved the surface sink mark and distortion caused by existing mold; however, the design concept is totally different from the conventional injection molding, it takes redesign of air path to improve the molding quality.

It can reduce the need for higher clamping force, but need to have enough large column inner distance and injection volume.

It can reduce the residual stress in product, and can prevent the retraction distortion.

Shortening molding time and reducing weight are the main reason for heavy, thick piece adopting GAIM, but the length of molding cycle is still subject to the cooling time of the thickest part of product after hollowing

CAIM can eliminate chamfering and coring mechanism and reduce material of mold ( with low pressure molding) but will increase air needle, mold modification and mold testing cost.

GASCIM unit uses high pressure nitrogen generated from special gas device to precisely control gas pressure, flow, time to inject the gas into molten resin in sandwiched co-injection mold and complete gas assisted sandwich co-Injection molding. In other words, GASCIM is processing equipment combines gas-assisted Iijection molding and sandwich co-injection molding. The functions included are the benefits of both parents, and the application can expand to thin-wall 3C for increasing mold prosperity, reducing distortion and deformation, promote product yield, reduce cost and increase functions of product and quality. 

PET is polyethylene terephthalate, a saturated polyester co-polymerized with terephthalate and Ethylene Glycol. It is good in transparency, gloss and airtight, and it meets the Food Safety Standard, and it can be recycled for re-use. The glass transfer temperature (Tg) of PET is between 75～80℃, and injection molding temperature is between 270～310℃, the mold temperature is 130～150℃. Since PET is high in water absorption, humidity prevention is specially required in storage, and before processing, it has to be dehumidified and dried under 150～180℃ for 4 hours normally. And, in order to prevent the resin to re-absorb moisture, it shall be kept at temperature above 140℃.  When operation is stopped, to prevent the resin turning yellowish, the dehumidifier / dryer temperature needs be drop to 100℃, only maintaining the temperature but not humidity. At the injection molding, if the material temperature is too high, screw shearing force is too high or revolving too fast, it is likely to generate acetaldehyde and leading to caudation. Normally, the molded PET bottle shall contain less than 3ppm of acetaldehyde.

In general, PET preform molding methods are in two types: direct blowing molding and extended blowing molding.
1. Direct blowing molding: This is to inject molten PET bottle on same machine (normally referred to as Injection Stretch Blow Molding, then in the hollow mold blow and stretch to molded product. Since the PET bottle is molded and stretch blown on same unit, so it is also called one step method, and before the bottle cooling off, the bottle is blown with the remaining heat, so it is also called Hot Bottle Blank method.
2. Stretch blowing molding: In this method, injection machine is employed to produce the bottle, then the cooled bottle is heated on stretch blown unit, and stretch and blow in hollow bottle to mold. Since this method is processing on injection and stretch blow machine, it is also called 2-Step method. Also, this method heats cooled bottle to blow and stretch, it is also called Cold bottle method. The process flow is as the following: dehumidify and dry PET materialinjection machine melt material and inject into moldcool PET bottle to molddual axis stretch blow molding by Stretch Blow Molding. Note: The dual-axis stretch is stretch longitudinally with stretching rod and high- pressure air for laterally extension.
3. The application: Generally, one-step method is better suitable for small volume production for large number of specifications. 2-step method is suitable for mass production of limited type. Our FT-P series—PET preform injection molding special unit is of 2-step method.

1. PET perform injection molding machine.
2. Dehumidifiers
3. Hopper Dryer
4. Auto Loaders
5. Mold Temperature Controllers
6. Chiller
7. Robot
8. Conveyor

PET material has been widely used in the packing container for the following products: water bottle, juice bottle, edible oil bottle, cosmetics bottle, drug bottle, bear bottle, wide neck bottle, detergent bottle.

1.Hydraulic Oil: Check if the hydraulic oil is between min. and max. line of oil gauge? If the toggle auto filler oil at proper level?
2. Cooling water: Check if the cooling water pipe is free of leakage and if water level sufficient to have normal cooling effect.
3. Start heating element and check: Ensure the electric heater of dryer, barrel and mold are at normal condition, especially the temperature must reach the set temperature before working injection, retreat and screwing motions.
4. Check the safety door and safety rod: Ensure the opening and closing of safety doors are normal, and the contact between safety door and each limit switch and the pressure relief valve are normal. Ensure the safety rod is proper position and firmly locked. Ensure the red press buttons on the operation box are working normally, so as to ensure the safety of operator.
5. Lubricating device check: Check if the grease oil level is sufficient and the filler time setting is proper and the filing device piping are unimpeded?
6. Moving mechanism check: All moving mechanism shall have proper lubrication, and the debris and dust on the moving parts shall be cleaned and maintain the friction surface clean and smooth. No tool shall be placed on moving parts, so to avoid breaking while machine is in operation.
7. Low pressure mold closing device check: Correctly adjust low pressure mold closing device to ensure the safety of mold.
8. Check other conditions: Ensure all settings, such as temperature, pressure, speed, timing and distance are correct.
9. Load free check: Work full-auto operation at lower pressure and let it run load-free for 10 to
30 min. and commence normal operation after a steady working condition is reached.
10. Noise check: Record the sounds at normal operation and the sound of hydraulic pump, it will allow operator to detect abnormality like blocking of filter, air-intake, internal wear. The buzz sound of solenoid is related to the debris in the internal axis. The buzz sound of      relay and magnetic contact indicate dirt and dust existence at the contact. Check the cause of the noise will be helpful in preventing damage.

1. Shut the gate of material hopper and reduce or close the heating device of hopper (depends on
the length of time of the stop.
2. Shoot out all the resin in the material pipe, particularly acid and corrosive materials must be    totally cleaned up.
3. Wipe mold to clean and apply anti-rust treatment. (depend on the length of time stopping operation)
4. When machine stopped, if the mold is not removed, do not extend toggle straight.
5. Close cooling water and switch off power.
6.Clean machine.

Weekly regular check
1. Heater check—Check for any broken wire or ill contact.  (For CE model, check the reading of amp meter).
2. Leakage check—Check the fittings of cylinder, oil pipe and solenoid for leakage.
3. Screw and nut check—Check the bolts, screws and nuts of the whole machine for any loss or loose.
4. Nozzle heater band check—remove any and all material attached to the lead wire and nozzle heater band.
5. Remove deposited waste oil on the machine.
6. Filtering mesh cleaning- within the first month, clean it every week, thereafter on monthly basis. Clean the whole machine.
Monthly regular check
1. Perform stricter check as per the weekly items and in determined manner.
2. Grounded wire check: grounded wire shall be checked strictly to ensure the user would not suffer electric shock.
3. Electric wire check: Electrical parts are likely to loose off due to vibration, burnt due to increase in current. So the terminal screws must be fasten firmly, and the dust, foreign matters and oxidation on the contact must be removed.
4. Movable mold platen and hydraulic motor seat skate check: check if the skate worn out, screw loose and moving parts are lubricated.
5. Cleaning and check of cooler: if underground, industrial water or salt water is used, remove the cooler to clean on monthly basis to improve and extend the efficiency and service life of cooler. If ordinary tap water is used, it may be cleaned in six-month interval (Basically, soft water is preferred, and add soften agent and scaling agent.)
Six-Month regular check
1. Repeat the monthly items in stricter and firmer attitude.
2. Hydraulic oil regular check: ask the oil supplier to make regular check of hydraulic oil to ensure the quality of hydraulic oil.
3. Check for any abnormal wearing of the moving part of machine.
Annual regular check
1. Repeat the half-year items in stricter and firmer attitude.
2. Electric motor check: Clean the intake port of cooling portion of electric motor with steel brush or air blower, because any dirt or dust exists, it will cause the motor to heat up and result to other heat damage directly.
3. Ventilation system check: Ventilation window installed on closed machine is for ventilation, so the oil stain and dirt attached shall be cleaned to prevent damage due to heating or cause oil temperature to rise.
4. Insulation check: The insulation of wire cover is downgrading gradually, so it is necessary to perform insulation measure to avoid accidental electric leakage and identifying earlier will permit prevention.

Generally, plastics can be split into 2 categories, thermoplastic and thermosetting.

Under ambienttemperature, thermoplastic is in granular type and when heated to certain temperature, it will becomemolten and when cool down, it will be solidified to a form. If heat again, it will become molten again fornext plastering.

Hence, thermoplastics can be molded through heating to molten and repeatedsolidification. So there is so called secondary material. On the other hand, thermosetting plastic issolidified when heated to a certain temperature, and even heat up again, the status will not change again.

So, thermosetting plastics cannot be heated to repeat the molding. Therefore, thermosetting wastematerial is normally unable to recycle.

The categorization is shown as the following figure.

Abbreviation ：UP(Unsaturated Polyester)、EP(Epoxy Resin)、PF(Phenolic Resin)、MF(Melamine Resin)、UF(Urea Resin)、SI(Silicone Resin)、PI(Polyimide)、PU(Polyurethane)、PABM(Polyamidebismaleimide)、BT(Bismaleimide-triazine)、   DAP(Polyarylphthalate)

The following are the characteristics of frequently used plastic materials, list down for reference.