Abstract: A heat exchanger includes fins and a plurality of pairs of cut-and-raised parts. Each pair of the cut-and-raised parts are positioned on both left and right sides in a width direction on a downstream side in a heating gas flowing direction around an outer circumference surface of each of upstream pipe body parts and face a downstream part on the outer circumference surface with a first gap therebetween. A width between upstream end parts of each pair of the cut-and-raised parts is larger than an outer diameter of each of the upstream pipe body parts. In addition, each pair of the cut-and-raised parts are inclined such that a width between downstream end parts becomes smaller than the width between the upstream end parts. A heating gas passing part having a width narrower than a dimension therebetween is provided in a region between two adjacent upstream pipe body parts.

Abstract: An improved outdoor cooking apparatus features a pot with multiple cooking inserts and burner frame that supports a burner element. One insert can be used for cooking an entire poultry carcass. Other inserts are perforated baskets that can be used to fry items.

Abstract: An improved outdoor cooking apparatus features a pot with multiple cooking inserts and burner frame that supports a burner element. One insert can be used for cooking an entire poultry carcass. Other inserts are perforated baskets that can be used to fry items.

Abstract: Described herein are reactors capable of sequentially or simultaneously depositing thin-film polymers onto a substrate by oxidative chemical vapor deposition (oCVD), initiated chemical vapor deposition (iCVD), and plasma-enhanced chemical vapor deposition (PECVD). The single-unit CVD reactors allow for the use of more than one CVD process on the same substrate without the risk of inadvertently exposing the substrate to ambient conditions when switching processes. Furthermore, the ability to deposit simultaneously polymers made by two different CVD processes allows for the exploration of new materials. In addition to assisting in the deposition of polymer films, plasma processes may be used to pretreat substrate surfaces before polymer deposition, or to clean the internal surfaces of the reactor between experiments.

Abstract: A heating system includes first and second heating devices, a temperature sensor, a first controller and a second controller. The first and second heating devices are respectively arranged above a crucible and around the crucible for heating semiconductor material in the crucible. The temperature sensor is configured to detect the temperature of the first heating device and to generate a temperature signal. The first controller is configured to control operation of the first heating device so as to adjust the temperature thereof based on the temperature signal. The second controller is coupled to the second heating device and is configured to control operation of the second heating device so as to adjust the temperature thereof, based on an external control signal.

Abstract: A wax melting system including a melting stage and a holding stage. Implementations may include a melting stage having a drain and the drain configured to permit flow of melted wax from the melting stage to the holding stage. A vessel may also be included. The melting stage and the holding stage may be coupled into the vessel and the melting stage oriented above the holding stage. The vessel may enclose the melting stage and the temperature of the melting stage may be maintained above the temperature of the holding stage.

Abstract: A furnace for conditioning preforms with several heating chambers rotating in a circle for heating one preform each with infrared radiation, and having holding devices for holding the preforms during heating, so that a section of the preform to be conditioned is essentially arranged in the heating chamber, and a section not to be conditioned is arranged outside the heating chamber. Accordingly, the section to be conditioned can be heated in a controlled and effective manner, and the section not to be conditioned can be protected from undesired heating.

Abstract: Soldering can be performed in a state where the temperature in an object zone is stable, regardless of the heat capacity of a soldering object. A soldering device includes: a position calculation unit which calculates the position of a heated object according to operational information of a conveyer which sequentially transfers the heated object into a plurality of zones for heat processing communicated with each other; a heat capacity calculation unit which calculates the heat capacity of the heated object; and a temperature management unit which controls the temperature in an object zone into which the heated object is carried, upon receiving positional information from the position calculation unit. The temperature management unit feedforward-controls the temperature in the object zone by adjusting the heat capacity of the object zone according to the heat capacity calculated by the heat capacity calculation unit.

Abstract: A hot runner nozzle heater system is provided with a layered heater in communication with a two-wire controller, wherein a resistive layer of the layered heater is both a heater element and a temperature sensor. The two-wire controller thus determines temperature of the layered heater using the resistance of the resistive layer and controls heater temperature through a power source.

Abstract: A compound body comprises a steel base element on which is deposited a heater layer. The base element is made of a precipitation hardening steel. In the form of a manifold or material feed tube in a hot duct system, said base element comprises a round or convex surface receiving the heater layer. This heater layer is a compound layer having several strata and/or strata elements which are thick film pastes or sheets and in such form are consecutively deposited, dried and baked-on. The pre-compression generated in this process in the heater layer is increased in controlled manner by precipitation hardening the base element.

Abstract: An apparatus and method for dispensing controlled precise amounts of a hot-melt adhesive. A positive displacement dispenser which is mounted on a programmable motion system is connected to a hot-melt cartridge feed assembly by an inlet block. The dispenser, feed assembly, and inlet block contain electric heaters and thermocouples for maintaining the adhesive at a desired elevated temperature. A computer control system regulates the temperature in the dispenser, feed assembly, and inlet block and controls a dispensing motor in the dispenser. A preheater heats an adhesive cartridge prior to placement in the feed assembly.

Abstract: Oven for non-metal melting, in particular silicon melting, with a housing enclosing an interior, at least one mould arranged in the interior for receiving a non-metal melt, at least one electrical heating device enclosing, at least partially, the at least one mould for influencing the temperature of the non-metal melt, and a power supply device connected in an electrically conductive manner to the at least one heating device for providing the heating device with a time-variable current I(t), wherein the current I(t) has a frequency of 0.1 Hz to 1000 Hz and the current I(t) is of a magnitude sufficient for setting a predetermined temperature of the non-metal melt, the currents in the plurality, where necessary, of heaters having a defined phase position in respect of one another.

Abstract: An MBE effusion cell is configured to produce an inverted temperature gradient; that is, the top surface of the melt is not cooler than the bottom surface of the melt. In one embodiment, the MBE effusion cell comprises a crucible having tip, central and base regions. First filaments are located laterally adjacent the tip region; second filaments are located laterally adjacent the central region; and third filaments are located laterally adjacent all three of the regions. The radial density of the number of the heater filaments is lower adjacent the base region than adjacent the tip or central regions. In another embodiment, further tailoring of the inverted temperature gradient is obtained by reducing the amount of insulation at the base of the crucible. In another embodiment, at least one heater filament extends substantially along the longitudinal axis of the crucible and is located adjacent its lateral wall.

Abstract: An apparatus and method for dispensing controlled precise amounts of a hot-melt adhesive. A positive displacement dispenser which is mounted on a programmable motion system is connected to a hot-melt cartridge feed assembly by an inlet block. The dispenser, feed assembly, and inlet block contain electric heaters and thermocouples for maintaining the adhesive at a desired elevated temperature. A computer control system regulates the temperature in the dispenser, feed assembly, and inlet block and controls a dispensing motor in the dispenser. A preheater heats an adhesive cartridge prior to placement in the feed assembly.

Abstract: An injector for equipment for injection moulding of plastic materials comprising at least one first heating resistor and at least one second heating resistor, which are controlled independently of one another and of which one is wound on a first area of the body of the injector extending substantially throughout the axial extension thereof and the other is wound on a second area that extends only along an axial portion of the body of the injector starting from a substantially intermediate area thereof.

Abstract: Film heater apparatus and method for heating a melt channel in a molding device includes structure and/or steps whereby a first dielectric layer is disposed on a surface of a substrate. An active heating element is disposed on the first dielectric layer, the active heating element being configured to generate heat to heat the melt channel. The active heating element has contact terminals arranged to support an electrical connection to the active heating element. A second dielectric layer is disposed over the active heating element, but not covering the contact terminals, thereby permitting coupling of the heater element to an electrical supply.

Abstract: A ceramic fiber band that can fulfill a plurality of functions in connection with the injection and/or extrusion process of an injection molding or extrusion apparatus (i.e. heat, cool, and insulate), thereby reducing overall energy costs and creating a safer working environment. The ceramic band, being an insulator and having heating and/or cooling elements with a faster response contained therein, exert the desired heating/cooling effect upon the barrel portion of the injection/extrusion machine thereby raising, lowering, or maintaining the temperature of the fluid plastic compound passing through the barrel.

Abstract: Film heater apparatus and method for heating a melt channel in a molding device includes structure and/or steps whereby a first dielectric layer is disposed on a surface of a substrate. An active heating element is disposed on the first dielectric layer, the active heating element being configured to generate heat to heat the melt channel. The active heating element has contact terminals arranged to support an electrical connection to the active heating element. A second dielectric layer is disposed over the active heating element, but not covering the contact terminals, thereby permitting coupling of the heater element to an electrical supply.

Abstract: An extruder cylinder is heated by resistance heaters surrounding cooling coils around respective segments of the extruder cylinder which is subdivided into heating and heating or cooling zones therealong. The rate of flow of the heat-carrier oil in the coil or the rate of flow of a cooling medium in heat exchange therewith can be regulated to control the cooling effect of the heat-carrier oil which can continue to flow through the coil even during purely heating phases for temperature equalization over the zone.

Abstract: A ceramic fiber band that can fulfill a plurality of functions in connection with the injection and/or extrusion process of an injection molding or extrusion apparatus (i.e. heat, cool, and insulate), thereby reducing overall energy costs and creating a safer working environment. The ceramic band, being an insulator and having heating and/or cooling elements with a faster response contained therein, exert the desired heating/cooling effect upon the barrel portion of the injection/extrusion machine thereby raising, lowering, or maintaining the temperature of the fluid plastic compound passing through the barrel.

Abstract: There is provided a heating element and an arrangement of heating elements, respectively, for heating crucibles, in particular for LEC devices for growing semiconductor single crystals, with a tulip-shaped bottom heater (20) being built such that the heater legs of the main heater (40) positioned thereabove can barely be guided towards the bottom. Such arrangement of bottom and main heater enables multi-heater arrangements without having to interfere with a lateral insulation (18) which, thus, need not be cut out or pierced.

Abstract: A thermoplastic material melting unit including various grid and reservoir configurations designed, for example, to optimize flow rate, melt rate and residence time within a melting unit. A main embodiment includes a supply hopper connected with a liquid reservoir having a plurality of heat exchanging elements, such as fins extending upward from its bottom wall. A melting grid is generally disposed between the supply hopper and the reservoir and includes both upwardly and downwardly extending heated fins. The downwardly extending fins intermesh with the upwardly extending fins of the reservoir. Additional embodiments of melting grids and heat exchange devices for melting solid thermoplastic material include bare element configurations, angled fin configurations and slotted fin configurations.

Abstract: A reflow soldering furnace in which a printed board and a plurality of electronic parts mounted thereon are subjected to reflow soldering. The furnace comprises a reflow soldering furnace body including a plurality of heating zones defined by furnace walls, a hot-gas applier, and a radiant-heat applier. The hot-gas applier includes a heat source and a fan for blowing a hot gas of a temperature lower than a target temperature for each zone against a printed board. The radiant-heat applier includes a heater for applying radiant heat of a temperature higher than the target temperature to the printed board. The printed board and electronic parts thereon are heated to the target temperature, the melting point of solder, by means of the radiant heat from the heater. Among these electronic parts, small-sized ones with a relatively small heat capacity are restrained from overheating by the low-temperature hot gas from the hot-gas applier.

Abstract: The invention relates to the electric melting technique, in which the melting energy is dissipated in the bath of melted glass as a result of the Joule effect by means of electrodes which dip through the surface of the bath. According to the invention, the electrodes dip into a bath of melted glass which has a height h below 800 mm and a surface S such that the ratio h/S is lower than 0.5 m/m.sup.2. According to another aspect, the exchange surface between the electrodes and the bath is above 0.075 m.sup.2 /m.sup.3 of glass.The invention is used in the manufacture of glass-based products, such as insulating materials based on glass fiber.

Abstract: A method and an apparatus for the programmed temperature control of a heating barrel provides for programmed temperature control in which a thermal sensor can be set selectively in either or any of plural sensor holes on the feeding zone of the heating barrel. By sensing the temperature at the most appropriate position with in the feeding zone, the molding injection is adapted to various resins with different properties, preventing clogging of resin in the heating barrel and changed color of molded articles.

Abstract: A thermoplastic melting apparatus for melting and dispensing hot melted adhesive materials includes a melting tank having an output line coupled to the bottom thereof for discharging a melted hot melt adhesive from the melting tank. A plurality of finned heat exchanger units are each mounted to the melting tank in the bottom portion of the tank but spaced from the bottom of the tank to allow for a 360.degree. contact with the melted thermoplastic material being heated by the heat exchanger unit. Each of the finned heat exchanger units have an elongated center bore therein and a resistance heating element mounted in each elongated bore. Each of the plurality of finned heat exchanger units is mounted within the melting tank chamber by a press fit aligning the opening in the elongated center bore with an opening in a wall of the tank. A threaded bolt is threaded from outside the tank into the opening to the center bore of the center core of each heat exchanger unit.

Abstract: An apparatus and process for jetting molten solder in the form of balls directly onto all the metallized interconnects lands for a ball grid array package in one step with no solder paste required. Molten solder is jetted out of a grid of holes using a piston attached to a piezoelectric crystal. When voltage is applied to the crystal it expands forcing the piston to extrude a desired volume of solder through holes in the aperture plate. When the voltage is decreased the piston reverses motion creating an instability in the molten solder at the aperture plate surface and thereby forming spherical solder balls that fall onto a metallized substrate. The molten solder balls land on the substrate and form a metallurgical bond with the metallized lands. The size of the solder balls is determined by a combination of the size of the holes in the aperture plate, the duration of the piston pulse, and the displacement of the piston. The layout of the balls is dictated by the location of the hooks in the grid.

Abstract: An apparatus for liquifying and supplying thermoplastic material including a melting hopper having a plurality of separately controlled heating zones. The hopper is formed of thin, rolled metal having a relatively low heat conductivity, such as carbon steel. Heaters are located along the length of the hopper and are separately controlled by way of thermostats or temperature sensors, such that the heat applied in a nonuniform manner to the thermoplastic material in the hopper during various stages of the melting and dispensing process.

Abstract: An apparatus for the melting of solid and quasi-solid materials, such as thermoplastics and hot melt adhesives, is disclosed. The grid type melter includes one or more heating fins and melt spaces. Multiple heating elements lying in separate planes are disposed in the heating fins and the base in a manner which results in a relatively even temperature distribution along heating surfaces. Degradation of melted material is avoided and material flow rate is improved due to even heat transfer to the material.

Abstract: Apparatus for the simultaneous production of preforms consisting of polyethylene terephthalate (PET) fed and distributed to a plurality of cavities. In order to reduce the occurrence of acetaldehyde formation in a cavity, for example, a heated distributor block used in the production of preforms of the PET material, the material flowing through a channel is subjected to additional turbulence. To this end, an element, preferably of metal, is installed in the channels, such element being provided with sets of radial spokes which are azimuthally offset in relation to each other in the axial direction. Besides inducing turbulence, such spokes act as homogenizing elements serving to diffuse heat over the cross section of the flowing process material.

Abstract: An interchangeable module for supporting a receptacle into which a molten sample, prepared by a fluxer, can be poured for analysis. One module can support a resistively heated casting dish into which a molten sample can be poured and cooled to form a solid sample for instrumental analysis. This module includes an insulator having a depression for receipt of a casting dish. A heating coil is positioned below the recession. A cooling gas conduit extends through the insulator support. The insulator is supported on a frame. The frame is supported on a back plate.

Abstract: In the operation of a hot metallizing furnace for lengths of metal, in particular metal strip, in which the length of metal to be coated is passed from above through the upper zone of a smelt of a coating material located in a smelt container, the smelt container can be heated by means of an induction coil made up of partial coils arranged axially on top of one another. During hot metallizing the upper partial coil(s) is/are connected to a medium frequency source of electricity in a single-phase manner. For the removal of the deposits which accumulate in the lower area of the smelt vessel, the lower partial coil(s) is/are connected to a three-phase current mains frequency source of electricity. The agitated deposits are then removed from the smelt using a collecting vessel.

Abstract: A process for the production of an injection nozzle comprising an essentially tubular inner part (16) and at least one essentially wire-type heating element (14, 15) which is embedded entirely inside a solid metal body (12, 13) lying in a close-fitting manner around the inner part in which one or more separate, essentially tubular metal bodies (12, 13) with a heating element (14, 15) embedded therein are formed by placing the heating element and the metal in a molten state in a mold, so that the heating element is completely enclosed by the molten metal, and subsequently allowing the metal to set, following which the body thus formed is removed from the mold and this tubular body or these tubular bodies thus obtained is or are then slid over the tubular inner part up to a certain point.

Abstract: An incandescent heating unit uses a low wattage incandescent light bulb to warm the occupant of a metal chair. The light bulb generates heat which is absorbed by the metal and radiated to the occupant. A dispersion disk spaced between the bulb and the chair prevents the formation of a hot spot in the portion of the chair nearest the bulb.

Abstract: A hopper-type hot melt dispenser for use in liquifying and dispensing drum or pail quantities of slug form hot melt includes a hopper size to receive a drum or pail of slug form hot melt. Band heaters around the circumference of the hopper heat the walls of the container suspended in the hopper causing slug form hot melt contained therein to be released as a slug into the hopper. The method of use of the apparatus provides for supporting a container of slug form hot melt in the hopper and heating the container with the band heaters until the slug is released, whereupon the container is removed from the hopper leaving the slug deposited therein.

Abstract: An apparatus for liquefying a thermoplastic plastic, in particular an adhesive on the basis of polyurethane, comprises a heatable sealed supply container having an upper portion for receiving a downwardly open transport container for the thermoplastic plastic and a lower portion serving as buffer volume, a heating means for heating the thermoplastic plastic disposed in the transport container, a base portion arranged beneath the supply container and thus beneath the transport container and accommodating a collecting trough for the liquefied thermoplastic plastic and a cover at the upper end of the supply container. In addition, a heating device, either a heat radiator or a contact heating means, is integrated into the cover to heat the bottom of the transport container and thus increase the discharge rate.Expediently, a resiliently mounted heating plate which comes to bear on the bottom of the transport container is provided in the cover.

Abstract: A deep fat fryer, especially for potato chips, has a cradle screen with walls and lifting handles and means for supporting the cradle screen at a lower level within the cooking kettle, a cover screen with lifting handles being selectively insertable into the product above the cradle screen for stirring it or placed over the product and resting on the walls of the cradle screen for keeping the product submerged. When the oil is at a lower level, the cradle screen is removed from the kettle after an initial cooking period and inserted into the product for stirring it and is then supported at a higher level over the product for keeping it submerged. The cradle screen walls have an opening to permit scooping of the product into the cradle screen after cooking. The cooking method includes varying the heating rate in order to control the rate of temperature rise of the oil after it drops to its lowest point following loading of the product into the kettle.

Abstract: Apparatus for melting and dispensing thermoplastic material including a hopper for receiving solid thermoplastic material, a flow-through grid melter secured to the bottom of the hopper and a reservoir mounted beneath the grid melter. The grid melter includes multiple parallel ribs extending across the width of the bottom of the grid melter. A single sinuous electrical resistance heater is cast in situ into the ribs of the grid melter. The underside of the grid melter is provided with recesses which function as accumulators to prevent the buildup of pressure on the underside of the grid melter upon remelt of solid thermoplastic material located above the level of the top of the grid melter.

Abstract: A heater has two, hollow, half-cylindrical heat guides fastened to each other at one side by an articulated connector and at the other side by a bolted joint. Internal surfaces of the heat guides represent the shape of the object being heated. On external surfaces of the heat guides, there are a series of, preferably flat splines. Lamellar heating elements are fastened to the splines. Mutual adherence surfaces of the heating elements and splines are shaped according to geometrical patterns, the appropriate selection of which changes the thermal characteristics of the heater over a wide range. The heater may be supplied from single- or three-phase mains. The heater is applicable especially for heating the cylinders, nozzles and tools of injection moulding and extrusion machines.

Abstract: A electric runner distributor heater for use in passageway of a mold into which a flow stream of fluid plastic material is introduced and which in turn communicates with a plurality of sprue orifices. The heater includes a metal casing having an exposed surface over which the fluid material is directed at an elevated temperature, a plurality of unsheathed electrical heating elements disposed in respective zones of the casing corresponding to the location of selected of the sprue orifices, heat transmitting material compacted in the bore of the casing and surrounding each heating element for electrically insulating the heating element from the casing and filling all air voids between the casing and heating element to effect direct heat transfer to the casing from the heating element, leads coupling the heating elements to a power source, and a control for independently controlling the temperature of the heating elements and thus the temperature of respective zones of the casing.

Abstract: At least one of the heated side walls of the oil container of a deep fryer is unbent to have planar interior and exterior surfaces. A sheet metal channel member, secured to the exterior surface of that side wall by flanges that flatwise overlie it, defines a tubular pocket which is open at one end. An electric heating element is embedded in an elongated heating body of electrically insulating material that is lengthwise slidably received in the tubular pocket with a close fit to be readily replaceable. Heat that the heating body radiates outwardly away from the wall is imparted to the channel member, the flanges of which transfer such heat to the wall in zones adjacent to the heating body.

Abstract: A cold crucible for melting and crystallizing non-metallic inorganic compounds having a cooled crucible wall in the form of metal pipes through which cooling medium flows which are in mechanical connection with the bottom of the crucible through which cooling medium also flows, and having an induction coil which surrounds the wall of the crucible and via which high frequency energy can be coupled in the contents of the crucible and having a second induction coil which can be controlled independently of the induction coil surrounding the wall of the crucible and which is provided below the bottom of the crucible, and having a crucible bottom consisting of a dielectric material.

Abstract: A hot melt adhesive dispensing system including a hot melt adhesive dispenser, a hot melt adhesive tank, and a hose for coupling hot melt adhesive from the tank to the dispenser. The dispenser, the tank and the hose are heated by electrical heaters to maintain the adhesive in a suitable molten condition for dispensing and for flowing from the tank to the dispenser. When the hot melt adhesive system is first energized, the hose and tank heaters are coupled to a source of electrical power and the temperature at either the tank or the hose is sensed. When the sensed temperature reaches a suitable preselected level, the dispenser heater is then energized by coupling the heater to a source of electrical power. In this way, as the adhesive in the dispenser is heated from a solid to a molten form, it is free to expand into the hose, with the adhesive in the hose adjacent the dispenser having already been heated to a molten state.

Abstract: A device for the manufacture of molded parts from molding materials, includes a molding tool being completely closed, having a molding cavity formed therein and being divisible, a heating device having two heating plates disposed on top of each other and fastened to the molding tool, the heating plates being in mutual contact along respective contact surfaces thereof, at least one of the contact surfaces having slots formed therein, and tubular electrical heating elements with metal cladding press-fitted in the slots.

Abstract: In a plastic injection apparatus comprising a barrel, an axially reciprocable, rotatable, plastic working screw in the bore of the barrel, a nozzle for injecting melted plastic from out of the front of the bore into a mold, and a plurality of axially spaced heater bands ringing the barrel over its length, the heat control for such apparatus is improved by subdividing the barrel into rear and front parts, impeding outward flow of heat from the rear part by the use of thermal insulating material and a heat reflective surface, and promoting outward flow of heat from the front part by the use of cooling means and of a tubular barrel cover which encloses such front part and has inner and outer surfaces which are heat absorptive and heat reflective, respectively. In one embodiment, the mentioned thermal insulating material is incorporated in a tubular insulating shroud enclosing the heater bands in the rear part and of greater I.D. than the O.D. of such bands.

Abstract: A preheater for a casting ladle includes a stationary horizontal refractory deck having vertical apertures in which are disposed refractory plugs, each of which supports an electrical heating element that depends downwardly from the refractory deck. A lifting table is movable into registration with the set of depending electrical heating elements and is also adapted to support the casting ladle thereon and to raise it into surrounding relation with the electric heating elements that depend from the refractory deck. Individual defective heating elements can be removed and replaced during operation of other operative heating elements.

Abstract: In a device for the melting and measured discharge of a thermoplastic adhesive material, a melting chamber is enclosed by a heating coil. The adhesive material in solid rod form is supplied into the melting chamber through a sealing sleeve formed of a material such as polytetrafluoroethylene (TEFLON). A heating element is mounted on the bearing sleeve adjacent the melting chamber to heat up the sleeve and the material within it to a desired temperature. A switch or other member is connected to the heating element on the sleeve for discontinuing its supply of heat to the sleeve when the desired temperature is reached. The part of the sealing sleeve on the opposite side of the heating element from the melting chamber can be provided with some structure to dissipate or block the flow of heat through the sealing sleeve away from the melting chamber.

Abstract: An apparatus for liquefying meltable material comprises a container adapted to be filled with the material to be liquefied. The container has a heavy bottom wall formed with closely adjacent perforations which taper in downward direction. The sum of the open cross-section of the perforations at the upper face of the bottom wall is only slightly smaller than the total area of the latter, whereas the sum of the smallest cross-sections of the perforations is only a small fraction of the total area of the bottom face of the bottom wall. The bottom wall is heated by electrical heating elements located in ribs separating the perforations from each other to a temperature to liquefy the material passing from the container into the perforations and the liquefied material flows in a collecting trough arranged below the container and separated by a heat insulating layer therefrom.