How to check Belt Dislocating of All-electric Injection Molding Machines Follow the procedure below to check timing belt dislocating on respective units (clamp unit, ejection device, injection drive unit, charge drive unit). 1) Move respective drive units on their stroke to [0] mm point. 2) Check if white marks on the pulley and belt meet, both on the drive and driven sides. By TOSHIBA MACHINE CO.,LTD.
Read more →How to Inspect Injection Molding Machines by Eye Timing belt and pulley require earlier replacement if illustrated as below. Please contact our service department. (1) Wearing on the belt tooth surface (Change limit: Approx. half the face width) (2) Crack on the root of the tooth of belt (Change limit: Approx. half the face width) (3) Crack on belt back face (Change limit: Approx. one-third of thickness at the root of the tooth) (4) Swelling of the belt by oil adhering (5) Wearing of the pulley tooth surface (Change limit: Wearing by 0.5~1 mm) [0.020~0.039 in] By TOSHIBA MACHINE CO.,LTD.
Read more →Inspection Method of Belt Tension in Injection Molding Machines Check by Tension Meter Follow the procedure below to check the belt tension of respective units (clamp unit, ejection device, injection drive unit, charge drive unit). 1) See [Appendix] and input span length, belt width and unit mass of the belt to a belt tension meter. 2) Give a light shock to the checkpoint of the belt by using a hammer. 3) Set a tension meter close to the vibrating belt to measure its tension. 4) Belt tension can be judged to be proper if the belt tension is within the target setting range. Check by Press Force Follow the procedure below to check belt tension of respective units (clamp unit, ejectiondevice, injection drive unit, charge drive unit). 1) See [Appendix] and check amount of deflection and press force of the belt. 2) Check actual press force when pushing the check point of the belt until the belt gets the amount of deflection on the list. 3) Belt tension can be judged to be proper if the press force is within
Read more →How to Check the Belt Tension of All-electric Injection Molding Machine Belt Tension Checking Point on Clamp Unit of All-electric Injection Molding Machine Belt Tension Checking Point on Ejection device of All-electric Injection Molding Machine Belt Tension Checking Point in injection drive unit of All-electric Injection Molding Machine Belt Tension Checking Point in charge drive unit of All-electric Injection Molding Machine By TOSHIBA MACHINE CO.,LTD.
Read more →How to Check Nozzle Alignment on Injection Molding Machines Check the nozzle center when changing the mold. In the case of a mold without locating ring especially, securely check the nozzle center. Misalignment of the nozzle center may cause resin leakage or mold damage. Follow the procedure below to adjust nozzle alignment. 1) After mold mounting, continuously press [ADVANCE] of the NOZZLE button to touch the nozzle tip to the mold for nozzle misalignment check. (At this time insert a piece of paper between the nozzle tip and mold to ease misalignment direction.) 2) Press [RETRACT] of the NOZZLE button to move the nozzle to the retract limit. If the nozzle center shifts vertically, loosen the clamp bolt fixing the injection unit to the base and use adjust bolt to adjust the height of the injection unit and secure vertical alignment. 3) If the nozzle center further shifts horizontally, use the horizontal adjust bolt equipped on the operation to adjust the horizontal positioning of the injection unit. 4) After adjusting tighten the clamp bolt. * Refer to the instruction manual
Read more →How To Replace Heater Fuse in Injection Molding Machines Since a triode AC switch (semiconductor) is used for the solid-state relay in the heater control circuit, a fuse for semiconductor protection (instantaneously melting fuse) is used to prevent overcurrent. The fuse, when required, must always be replaced with the same type and rating of the fuse. Note that a normal fuse cannot protect the solid-state relay. Even if an instantaneously melting fuse is used, repeated fuse blowing due to short-circuits, etc. will deteriorate the semiconductor, possibly causing damage to the solid-state relay. Therefore, short-circuiting should be minimized. There are instantaneously melting fuses in the Injection box of non-operation side. By TOSHIBA MACHINE CO.,LTD.
Read more →Stretch Blow Molding Technique Introduction The stretch-blow process can give many resins improved physical and barrier properties. In biaxial orientation, bottles are stretched lengthwise by an external gripper, or by internal stretch rod, and then stretch radially by blow air to form the finished container against the mold walls. This process aligns the molecules along two planes, providing additional strength and even more important, better barrier properties then are possible without biaxial orientation. Other advantages include better clarity, increase impact strength, or toughness, and reduce creep. The actual increase is dependent on the ratio of blow-up in each direction. Stretch blow molding is possible for thermoplastic materials such as PET, PVC, polystyrene, acrylonitrile, polypropylene, and acetals. The amorphorous material with the wide range of thermoplasticity are easier to Stretch blow than the partially crystalline types. With the partially crystalline type, if the crystallizing is too rapid, the bottle is virtually destroyed. Stretch-blow processing can be separated into two categories: in-line and two-stage. In-line processing is done on a single machine, while two stage processing requires an injection line to produce
Read more →Injection Blow Molding Technique Introduction In injection blow molding, a preform is formed by a conventional injection molding machine plasticator. The injection molding machine injector provides an optimum plastics melt, with the uniformly homogeneous melt that is repeatable. This plastic melt is injected into the preform cavity forming the preform around the core rod. In tool design the core rod and the parison are very important. Each container to be blow molded has its unique parison and core rod design. The second stage consists of transferring the injection molded preform, via either the core rod or the neck ring, into the blow mold. At this station compressed air enters through the core rod or seal ring, and the preform is blown into the blow mold configuration . It is held in the cold blow mold until the material is set, and then the air is exhausted and the blown bottle ejected. Machines are used with from two to six stations. In the two-station machine, the finished container is ejected after the blow mold opens at the blow station by air
Read more →Venting of Plastic Injection Molds Before the plastic melt is injected, the cavity in the closed mould contains air. When the melt enters the injection mould, if the air cannot escape it become compressed. At worst this may effect the filling, but in any case the sudden compression of the air causes heating. This may be sufficient to burn the plastic and the mould surface at the local hot spots. To alleviate this problem, vents are machined into the mating surfaces of the plastic injection mould to allow the air to escape.
Read more →How To Replace the Barrel in Injection Molding Machine Replace the barrel by following the procedure below. 1) Swivel the injection unit. 2) Withdraw the screw by referring to the previous section. 3) Remove heater cover, thermocouples, and heater cables. 4) Remove the barrel set bolts with the barrel suspended by wires hooked on the eye bolts. 5) Draw the barrel forward and remove it while suspending. 6) Tighten clamp bolts After replacing screw and barrel, return injection unit and base to machine-center. Refer to the instruction manual “Appendix”, to tighten clamp bolts with proper torque. The clamp bolt tighten with excessive torque causes offset of nozzle-center. By TOSHIBA MACHINE CO.,LTD. Feel Free to Contact Us if Any Questions
Read more →How To Replace the Screw in Injection Molding Machine Replace the screw by following the procedure below. 1) Swivel the injection unit by referring to the previous section. 2) Dismount the injection cover to remove the split collar connecting the screw and S shaft. (Unscrew socket head bolts to remove the split collar.) When reassembling, tighten the bolts at the specified clamp torque. Refer to [Appendix] separately provided. 3) Removing the nozzle Use the attached to remove the nozzle. A gentle blow to the spanner can easily loosen the nozzle.The nozzle is right-hand threaded. NOTES: a. Remove or install the nozzle while hot. After cooled, scuffing or thread may be encountered. Recommendation temperature is from the actual barrel setting temperature to 250℃. b. When mounting the nozzle, thoroughly clean the threads and sealing part, and apply metal lubricant (LUBE-EKS P9, OMEGA 99 or equivalent) in advance. c. Lightly tighten threads first. After nozzle and barrel temperatures rise to the same level, tighten them completely. 4) Turn on the power of the machine and press MOLD SET-UP of the OPERATION button.
Read more →Swiveling the Injection Unit in Injection Molding Machines Follow the procedure below to swivel the injection unit. 1) Continuously press [RETRACT] of the NOZZLE button to retract the injection unit to the retract limit. 2) Press [SERVO] of the PREPARATION button to turn off the motor before turning the power off. 3) Remove two pieces of clamp bolts fixing the injection unit and base. When reassembling, tighten the bolts at the specified clamp torque. Refer to [Appendix ] separately provided. 4) Check that no one exists around before swiveling the injection unit. i4～i8 over have ratchet drive mechanism.（ i3 below are without ratchet.） NOTE: If swiveling is heavy, apply grease on the swiveling face. NOTE: After returning the injection unit, follow the procedure of [6.1, Nozzle Alignment Check] to adjust the nozzle. By TOSHIBA MACHINE CO.,LTD.
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