Hull Industries' Complete Molding Solution Process - Automatic Material Loading - Mold Design - Thermoset and Composite Molding Presses - Automated Parts Handling - Deflashers - Hull Industries' Complete Molding Solution Process

• Complete Molding Solution
  • Automatic Material Loading
  • Mold Design / Presses
  • Automated Parts Handling
  • Deflashers
• Plastic Molding Equipment
  • Transfer Presses
  • Compression Presses
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  • Shuttle Presses
  • Injection Presses
  • Custom Presses and Equipment
• Hydraulic Stuffer
• Deflashing Systems
  • Low Pro Inline Deflasher
  • Rollaveyor Deflasher
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• Mold Design & Repair
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Plastics Molding Equipment

Injection Molding, Transfer, Compression, Shuttle, Automatic Compression & Custom Presses

Injection Presses -View PDF-

FIRST, THE COMPANY BEHIND THE MACHINE

Hull started the thermoset evolution when leading custom and proprietary injection molders came to Hull to develop injection molding machinery for this material. As a result, Hull has pioneered most of the present technology.

Today, Hull injection molding machines incorporate the latest state-of-the-art advances.

AN OVERVIEW OF THE 110 SERIES

Some standard features provided by the Hull 110 Series may be found on other makes of machines (often as optional extras), but no other machine offers all the advantages of the Hull 110 Series.

110 Series machines are particularly well suited to mold big, deep-drawn parts requiring large shots and high plasticizing rates.

PRECISE CLAMPING

The Hull 110’s clamps are all fully hydraulic to assure precise control.

Clamps decelerate just before the end of both the closing and opening strokes to prolong mold life and prevent broken ejector pins (which can occur if the mold slams against the stop on opening) Deceleration points are easily set by sliding cams on a cam bar on the front of the machine.

A “breathe” cycle is included as standard feature. The mold can be opened slightly for a precisely controlled interval at any point during the injection and/or hold periods. “Breathing” makes complex molds easy to fill, adds more strength to the molded parts, and prolongs the life of polished mold surfaces by letting gases escape rather than trapping and burning them.

Extra-long clamp stroke permits the use of deep molds. Mold change is quick and easy since there are only four limit switches to adjust.

Usable platen area on Hull 110’s is greater than machines of similar or even higher tonnage. Platens are guided on chrome plated tie rods ground from special alloy steel and run on shoes adjustable to compensate for wear.

LARGE SHOT & HIGH PLASTICIZING RATE

Large shot capacity and high plasticizing rate of Hull 110 Series are principally the result of a high L/D ratio of the screw and a long injection stroke.

Screw rotation is controlled by a high-torque, infinitely-variable-speed hydraulic motor. The screw tachometer, supplied as standard equipment, lets you set screw speed precisely within the machine’s range to achieve optimum speed for every molding situation, and to duplicate it each time you change molds or materials.

Hull 110 Series machines provide continuously-variable controls for injection speed and for screw back pressure. These give you better control of plasticizing and melt conditions, reduce nozzle drool, and reduce wear on the screw and barrel.

Two injection pressures are provided: high pressure for initial mold filling, and a lower holding pressure during cure. Injection speed is adjustable.

Injection units are available with plungers if requested for use with BMC.

TIGHT TEMPERATURE CONTROL

Barrel temperature control is adaptable to a wide range of material requirements. There are four zones on the 100-ton machine, five on the 200, six on the 300 and seven on the 500-ton model. A dual water-temperature controller can supply two different water temperatures to two manifold behind the barrel. By adjusting flow controls and temperature controller setting, you can get any temperature gradient you need over the full length of the barrel. Unlike other machines, the barrel on the Hull 110 is jacketed right up to the nozzle, eliminating freeze-ups.

Another important feature of the temperature control system is the fast cool-down feature. This makes it possible to shut down a machine in a few minutes-leaving material in the barrel without danger of freeze-up. After switching to fast cool-down, the barrel and screw temperature drop so rapidly that one or two shots will clear all plasticized material from the barrel. You can run right up to “quitting time,”shut down, and be ready to go again next morning.

Of course, there are circumstances when you do get a freeze-up, and if this happens, it’s a simple matter to fix. On most models, the barrel swings out for easy access to the nozzle; and the hexhead threaded nozzle unscrews easily with the wrench supplied to expose the straight-through bore of the cylinder.

The entire injection system is mounted on a three-point suspension. By adjusting one nut, you can align the nozzle to sprue bushing even if the bushing is not on center. With both horizontal and vertical adjustment available, you can reduce set-up time considerably, and eliminate the danger of damaged nozzles and sprue bushings.

SPLIT-SECOND TIMING

The entire molding cycle is controlled to split-second accuracy as follows:

1. Boost Injection-high pressure injection for rapid mold filling
2. Injection Hold-low pressure injection until curing begins
3. Charging Start-screw accepts more material from hopper
4. Nozzle Backward-”Sprue break” feature; nozzle retracts before material starts to cure in the nozzle *
5. Degassing Start-mold opens slightly to “breathe” *
6. Degassing Finish-mold closes again *
7. Curing Finish-mold opens and parts eject
8. Cycle Delay-pause between cycles, if required

*Can be set to zero if not required.

OPTIONS AND MODIFICATIONS

Just about every feature you could want for normal thermoset molding is included as standard equipment. However, we can furnish conversion kits for thermoplastic molding, feeding systems for rubber materials, and fully developed feeding system for very high bulk-factor materials such as BMC.

We can also provide side core sequences of any type required, nozzle shut-offs for certain thermoplastic materials.