The heating plates of the presses are rectangular plates. They are made from solid steel plates, ground and milled on all sides. The set consists of two plates. The number of heaters in the mold is determined by its mass (or heat transfer surface area), operating temperature and heater power. Heating plates can be heating elements, ohmic or induction.

The Orenburg plant of pressing machines produces heating plates for hydraulic press brands DG, DE, P, PB.

The heating plates of the presses are rectangular steel plates with a thickness of 70 mm. They are made from solid steel plates, ground and milled on all sides.

The heating plate consists of two parts fastened together, in one of which grooves are milled for laying heating elements (heating elements). The power of one heating element is from 0.8 to 1.0 kW, voltage is 110 V. The plates have grooves for placing heating elements with a diameter of 13 mm. Two heaters connected in series are installed on one phase.

The quality of plastic products is greatly influenced by the temperature at which they are made. The temperature regime of the mold depends on the structure of the processed material and the features of the technological process chosen to obtain this product.

The set consists of two plates. The number of heaters in the mold is determined by its mass (or heat transfer surface area), operating temperature and heater power. Depending on the required heating power, 6 or 12 heating elements are installed on each plate. Contact clamps are covered with casings.

For heating molds, electric heaters are mainly used, based on the use of resistance elements of various designs. The space around the spiral is securely isolated, which increases its service life. The electric heater is located in the thickness of the mold at a distance of 30-50 mm from the forming surface, because at a closer location, local overheating is possible, which will lead to the marriage of products.

Temperature control of heating plates is ensured by the use of thermocouples THC. A heat-resistant wire laid in a metal hose safely connects the plates to the cabinet.

Heating plates for hydraulic press P, PB

For heating removable molds heating plates, in which channels are drilled for the location of tubular electric heaters. The hotplates are attached to the press plates via thermal pads to reduce heat transfer to the press. For stationary molds, heating plates are attached to the bottom of the die and to the top of the punch.

Recently, induction heating of molds by electric current of industrial frequency has become widespread. With induction heating, power consumption is reduced, mold heating time is reduced, and the service life of electric heaters is increased.

For purchase inquiries heating plates for presses please contact via the feedback form or by phone numbers listed in the contacts.

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Form of payment, order of delivery, guarantee of heating plates:

• The sale is carried out on the terms of 50% prepayment when ordering plates for production and 100% prepayment if they are in stock.
• Delivery is carried out by the transport companies of the Supplier or the Buyer by agreement, as well as by railway transport.
• Transportation costs for the delivery of goods are paid by the Buyer.
• Warranty for all new products 12 months, for products after overhaul 6 months.

Please note that the information on the site is not a public offer.

induction heating

At the beginning of 2010, Gas Injection WorldWide, a partner of Japanese Injection Machines for gas/water/steam injection technologies, launched the world's first commercial launch of a new technology - external induction heating as part of the overall RTC (Rapid Temperature Cycling) technology.

In issue 10-2009 of the Plastics magazine, our company, which allows you to achieve high gloss by heating the mold before the moment of injection and during filling the cavity of the product. This technology is excellent for voluminous or large planar products, giving them not only shine without staining, but also eliminating internal stresses and numerous defects that are inevitable in conventional casting.

RTC IHC technology - external induction heating is used for another group of products - small products with a maximum size of 30 x 30 x 3.0 cm (approximately the size of a 15-inch monitor), which have a small height, and are conventionally called "two-dimensional". The main advantages of external induction heating technology:

• Technology can be used with existing molds
• Mold surface heating rate is about 4 times faster than steam injection molding

External induction heating technology works in the following way:

• The mold opens;
• A robot enters the mold cavity from above to remove the previous product from the movable side of the mold, and at the same time, a heating device enters the mold cavity from below, which is adjacent to the fixed side of the mold (as a rule, the front surface is on the fixed side) at a distance of 3.0-5.0 mm from the surface of the mold;
• The heating device with a copper induction coil heats the mold cavity to a predetermined temperature, usually within 3 to 6 seconds, after which the mechanical device descends;
• The mold closes and the normal injection molding cycle takes place.

During induction heating, a high frequency alternating current is passed through a copper induction coil. Using the well-known electromagnetic phenomenon, the current in the induction coil induces an eddy current (Eddy Current) in the first 200 microns of the mold surface steel. The resistance to eddy current flow in the steel creates a very rapid heating of the mold surface. The shallow heating depth (200 microns) compared to the steam injection molding method (8.0 mm) allows heating with significantly lower energy costs.

If you put your hand between the molds and the heating device, you will not feel any heat or temperature change, but if you put on the wedding ring, it will become very hot very quickly. Therefore, the advantage of induction heating technology is the absence of energy dissipation.

To implement this technology, you need:

• RTC IHC control controller
• Copper induction coil
• Feed mechanical heating device

Panel made of glass-filled polycarbonate

Induction heating technology makes it easy to eliminate melt flow lines and solder lines, especially on products such as a TV remote control or mobile phone case with buttons, a camera or monitor case, various view panels in a car, when the melt diverges and converges repeatedly. As with the steam casting technology, induction heating has all the advantages of the RTC SWC technology in addition to the gloss of the product (which is achieved without staining):

• Eliminate visible cold junction lines and material flow
• High quality surface with very good gloss without staining even on standard material
• Excellent flowability of the surface structure, especially difficult areas (for example, acoustic grilles on a TV cabinet)
• Smooth surface even when using glass-filled materials
• Elimination of "silvering" on the front surface
• Improved optical properties of the surface - less distortion / more uniform refractive index
• Reducing the wall thickness (reducing the weight of the product and reducing the cycle time) and increasing the length of the melt flow path is possible, it is possible to reduce the holding and cooling time
• Reduced cycle time and significantly lower power consumption compared to other RTC methods

At the same time, induction heating works well on small products, and, most importantly, their shape must be “two-dimensional”, that is, the product does not have a large thickness dimension (no more than 30 mm), and induction heating is used for the front surface. The technology not only improves the appearance of the product and allows you to achieve excellent gloss without expensive staining, but significantly reduces the number of defects.

The limitation is due to the fact that after the start of the cycle, the heating stops and the temperature of the mold drops. The second time it rises when the material is injected, and then falls again.

Another method of induction heating is internal induction heating, where heating elements are built into the mould. This avoids the temperature drop up to a certain point, but there is a conflict between the heating zone and the cooling zone inside the mold, reducing efficiency and increasing energy consumption. In addition, unlike external induction heating, the mold must be modified, and the cost of license and patent royalties is quite high.

A third method of induction heating uses the insertion of heating cartridges into the mold, similar to hot runners, but this technology has the disadvantages of the previous method, as well as less effect - visible solder lines, despite the shine of the product, and hot runners tend to burn out after a few weeks.

Similar to external induction heating, external infrared heating method. The same device once a cycle rises from below into the mold cavity and heats up, but with the help of infrared elements. Despite the similarity of technologies in practical results, there is a huge difference between them:

• Unlike the induction method, infrared heating also radiates heat into the air. This leads to heat dissipation and energy loss;
• The big disadvantage of the infrared heating method is that the energy is reflected from the polished surface of the mold, so the heating speed is very slow and the electricity consumption is high;

In general, to summarize, the infrared method uses radiated heat, while the induction method uses the electromagnetic effect. Therefore, the induction method provides heating much faster, while using significantly less electricity.

The world's first external induction heating system customer produces an automotive part made from ABS/PC, which is then vacuum metallized. Since the negative effect of visible solder lines and melt flow paths has decreased several times, the amount of scrap compared to traditional injection molding after the plating process has decreased several times. Using induction heating from Gas Injection WorldWide, scrap after plating was reduced to less than 2%. It is worth noting that the part is used by one of the main German car manufacturers, but his name is not subject to publication.

In our company's office, you can watch a video of the production of this product with the process of external induction heating.

Which is used to heat the metal parts of cars without harming neighboring parts.
induction heater produces heat without the use of physical contact or fire. Does not require complete dismantling of heat-resistant parts adjacent to the heated

The new induction heater is 50% more powerful than the previous CH33 version

With the help of the induction heater CH 37, various types of work can be performed:
heating of rusted bolts and nuts
heating rusty hinged doors
heating of steel and aluminum surfaces during repair
heating of rusted exhaust flange bolts, in hard-to-reach places
heating of rusted bolts and nuts of the suspension and steering
easy removal of anti-corrosion coating and PVC putty.

induction heater designed to heat all magnetic materials (thermal materials) by concentrating the magnetic field at the end of the heater. But, the heater also works well with aluminum. The magnetic field oscillates at a frequency of approximately 55 kHz. The magnetic field creates an eddy current in the material, and electrical resistance leads to heating of the metal.

CH 37 has an internal cooling system, water acts as a coolant. The circulating water cools the power electronics, cables, handle of the induction heater and the heater itself. As soon as the heater turns on, the water pump starts pumping cooling water into the heater.

Specifications:

• Supply voltage 208-240 V, 16 A, 1 phase
• Frequency: 50-60Hz
• Protection class: IP21
• Working cable length: 3m
• Cooling: water (20 l)
• Machine weight: 34 kg

Induction heater for a wide range of applications

In April 2008, the well-known Swedish company CAR-O-LINER officially introduced a new induction heater with increased power CH37. The novelty is more powerful than the previous version CH33 by as much as 50%!

The CH37 uses state-of-the-art technology - compare: when using a gas burner for localized heating, you are limited when working in close proximity to plastic and other heat-sensitive materials. The CH37 heater is also used for heating parts, but without an open flame (!!!) - heating of surfaces is carried out by high-frequency currents, which makes it possible to heat parts and surfaces even in the most inaccessible places.

A heater of this kind is designed to heat all magnetic materials (heat-conducting) by concentrating a magnetic field at the end of the heater. However, the heater also works well with aluminum. The magnetic field oscillates at a frequency of approximately 55 kHz. The magnetic field creates an eddy current in the material, and electrical resistance leads to heating of the metal.

CH 37 has an internal cooling system, water acts as a coolant. The circulating water cools the power electronics, cables, heater handle and the device itself. As soon as the induction heater turns on, the water pump starts pumping cooling water into it.

The quality of plastic products is greatly influenced by the temperature at which they are manufactured. The temperature regime of the mold depends on the structure of the processed material and on the features of the technological process chosen to obtain this product.

So, when injection molding thermoplastics, the mold is cooled, while pressing thermoplastics, it is heated. Steam, gas and electric heaters are used to heat molds. Steam and gas heaters are rarely used, as they are dangerous to operate and cumbersome. Electric mold heaters come in three varieties: electrical resistance heaters, induction heaters, and semiconductor heaters.

The most common is electrical heating, based on the use of resistance elements. The designs of electric resistance heaters are diverse.

a - electric heater for stationary molds; b - system of induction electric heating of the block for injection molding

More often than others, round heaters are used. One of the types of a round electric heater is shown in Fig. 126 a. The heater body is a ceramic tube 1 enclosed in a protective metal shell 2. Inside there is a ceramic tube 3 of a smaller diameter, around which a nichrome spiral 4 is wound.

The space where the spiral is placed is filled with quartz sand. This filler increases the thermal conductivity of the electric heater and increases its service life due to limited air access.

The placement of heaters in the mold depends on its design, i.e., on the height of the matrix, the location of the ejector and fasteners. It is desirable to place the electric heater in the thickness of the mold at a distance of 30-50 mm from the forming surface. With a closer location, local overheating is possible, which will lead to the marriage of products.

The number of heaters in the mold is determined by its mass (or heat transfer surface area), operating temperature and heater power.

For heating removable molds, heating plates are used, in which channels are drilled for the location of tubular electric heaters. The hotplates are attached to the press plates via thermal pads to reduce heat transfer to the press. For stationary molds, heating plates are attached to the bottom of the die and to the top of the punch.

Recently, induction heating of molds with an electric current of industrial frequency has become widespread. With induction heating, power consumption is reduced, mold heating time is reduced, and the service life of electric heaters is increased.

Inductors in the form of coils of PSDK copper wire with glass insulation are placed in grooves made in the heating plate or in the mold itself, around its forming sockets. Inductors are usually filled with liquid glass or high-temperature silicone-based plastic.

On fig. 126b shows a universal block for thermoplastic injection molding.

Replaceable molds are installed on the plate 6. During installation, the mold is put on the protruding part of the loading chamber 8, made in the form of a pipe. The method of induction heating is used to heat replaceable molds. The inductors 7 are located in the grooves of the plates 5 and 6.

The interaction of the parts of the block is similar to the stationary mold, previously considered in fig. 121 a.