JPH06154692A - Device for hot-melting thermoplastic synthetic resin - Google Patents

Abstract

PURPOSE:To melt a thermoplastic synthetic resin to obtain a hot-melt adhesive which is applied onto a base material. CONSTITUTION:This device is composed of a hopper 1, a preheating melter 2, a heating melter 3, a high-temp. melter 4, a lid 5, a sheathing insulating member 6, an inert gas sealing means 7 and a coating means 8, and a guide plate also used as a baffle is furnished in the hopper, a preheating fin also used as a moderate cutting baffle in the preheating melter and a checkered heating fin for fine cutting in the heating melter. Since the lump of a solid thermoplastic synthetic resin is gradually hot-melted in an inert gas atmosphere without being oxidized, carbonized, hardened or deteriorated, and the hot-melt adhesive is applied on a base material. Further, the device is operated without heating the heat source for the guide plate and preheating fin, and even a fine- grain solid thermoplastic synthetic resin is hot-melted by one device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for melting and melting thermoplastic synthetic resin capable of melting a thermoplastic synthetic resin into a hot melt adhesive and applying the hot melt adhesive to a substrate to be coated. (Hereinafter, simply referred to as a melting device).

[0002]

2. Description of the Related Art As a conventional melting apparatus, there is a melting apparatus which comprises a hopper and a plurality of heating projections provided in the lower part of the hollow and a lid for melting a thermoplastic synthetic resin. .

[0003]

However, in the conventional melting apparatus, the material shapes of the thermoplastic synthetic resin to be melted are various, and the shapes of the blocks, beads, pellets, chips,
When a solid thermoplastic synthetic resin such as a string is melted by heat, a separate melting device is required for each material.
To give an example, solid thermoplastic synthetic resin is charged from the hopper, and the thermoplastic synthetic resin is melted at once by the heating protrusion in the melter. Due to the change in viscosity due to the non-uniform temperature of the thermoplastic synthetic resin in contact, the melted material further hardens and hardens, sticking occurs, or the flow is poor and retention occurs in some of the flow paths, causing the effects of heat deterioration, etc. This is a phenomenon that occurs due to the above phenomenon or a reverse convection phenomenon, that is, when a new material is additionally charged into the hot melt during melting, the material sinks in the central portion and the melted material rises and wraps around. this is,
The melting of the new material in the central part is delayed, and what was melted earlier is often reheated again on the wall surface of the melter, and the local heating causes the thermoplastic synthetic resin to oxidize, carbonize,
There are problems that it is easily hardened and deteriorated, and that melting cannot be performed efficiently. Furthermore, the thermoplastic synthetic resin adheres to the wall surface in the melter, heat deterioration or hardening deteriorates the fluidity, and finally the pipe line is narrowly blocked, so that it is hardened unnecessarily, In order to melt the sticky substance, the temperature is lowered to lower the viscosity to improve the fluidity, and other elements mixed with the thermoplastic synthetic resin are vaporized and evaporated to produce a defective product that is not suitable for the purpose of use. Further, for example, even if the amount of liquid to be pumped is increased, there is a problem in that the thermoplastic synthetic resin that has been melted by heat cannot be fed if the pipe line remains thinly closed. Furthermore, there is a problem that the melting machine becomes unusable due to clogging of dust and foreign matters adhering to the solid thermoplastic synthetic resin fed from the hopper.

Therefore, in the present invention, as compared with the conventional art, the pipeline is blocked by fine particles lumps that have been thermally deteriorated, foreign substances from which the carbonized film has been peeled off due to local heating, and foreign substances from dust when the solid thermoplastic synthetic resin is supplied. It is possible to reduce the phenomenon of oxidation, carbonization, curing, deterioration, etc. of the thermoplastic synthetic resin in the melter, and moreover, the thermoplastic synthetic resin can be efficiently melted, and the heat loss is small, and An object of the present invention is to provide a melting device that does not cause deterioration of the quality of the adhesive material.

[0005]

In order to achieve the above-mentioned object, the melting apparatus of the present invention has a structure in which a hollow material having an open upper surface and a lower surface is roughly cut along the flow of the molten material. A hopper provided with a guide plate also serving as a baffle for use, and a heat source embedded in the guide plate at an appropriate place for heating when necessary; a hollow interior located below the hopper and having open upper and lower surfaces A preheating melter in which a preheating fin also serving as a baffle for cutting is provided along a downward flow, and a heat source for heating as needed is embedded in an appropriate place of the preheating fin; and the preheating melting It is located below the vessel and has a heating fin that doubles as a grid-shaped baffle plate for fine cutting along the downward flow inside the hollow with the upper and lower surfaces open, and the heat source is buried in the appropriate place. A warming melter; located below the warming melter and made of thermoplastic A high-temperature melter having a funnel-shaped reservoir recess in which heating fins for heat-melting a synthetic resin are provided at appropriate positions and in which a heat source is embedded; and a lid body that closes the upper surface of the hopper to hermetically seal the inside. ; In order to prevent heat dissipation to the outside, keep the inside of the melter at an appropriate temperature and prevent burns,
An exterior heat insulating member provided with an insulating space portion for the purpose of heat insulation and heat insulation with the surface of the melter; a supply line for supplying an inert gas into the melter, and a gas filling the inside thereof is exhausted. Inert gas encapsulation means composed of an exhaust line and a temperature control means such as a microprocessor to control the inside of the melter to an appropriate temperature, and automatically control the thermoplastic synthetic resin melted to the necessary and appropriate temperature. It is possible to deliver the appropriate amount required by a gear pump connected with a possible servo motor to a heat hose having a coating nozzle with heating at the fixed amount and the required pressure, and the gear pump is used by the controller for automatic control of the servo motor. And a coating means capable of automatically stopping and automatically changing.

In the high temperature melter, when the pressure at the outlet of the gear pump rises above a certain value, the safety relief valve operates and the molten thermoplastic synthetic resin at the outlet of the gear pump enters the funnel-shaped reservoir recess of the high temperature fuser. It is also possible to use a device which is provided with a means for preventing pressure rise for recirculation, a filter is provided at the outlet or inlet of the gear pump, and when the safety valve is activated, the rotation speed of the servo motor is automatically controlled if necessary.

[0007]

As described above, according to the melting apparatus of the present invention, the order of preheating the temperature of the melting vessel or charging the solid thermoplastic synthetic resin does not matter. , Open the lid of the melting device, put the block-shaped, bead-shaped, pellet-shaped, chip-shaped, and string-shaped solid thermoplastic synthetic resin from the upper surface of the hopper, close the lid, and supply from the supply line in the inert gas sealing means. For example, an inert gas heated by a heater is supplied to make the inside of the melter an inert atmosphere and preheated by the heat source in each melter, and the hopper, preheater melter, warmer melter, high temperature melter When the temperature reaches the set temperature, which is set to a high temperature in a stepwise manner, the thermoplastic synthetic resin material inside is melted by heat, the gear pump can be driven, the interlock is released, and the thermoplastic synthetic resin melting device is released. It is used.

The melting procedure will be described in more detail. For example, in the case of a solid thermoplastic synthetic resin which is a block-shaped lump, the thermoplastic synthetic resin charged is roughly cut by a guide plate also serving as a baffle plate in the hopper. Then, it was melted by the preheating fins that also served as the baffle plate in the preheating melter, and was further melted into a medium cut shape, and it also served as a grid-shaped baffle plate in the heating fuser. The thermoplastic resin is gradually finely melted by being finely cut into a rod shape by the fins for heating, and the thermoplastic synthetic resin gradually heats up to the core by the heat source in the funnel-shaped reservoir recess that facilitates the flow of the high temperature melter. To be melted. At this time, when the preheated inert gas is supplied to increase the internal pressure, the sensor is activated to stop the supply of the inert gas and exhaust the gas from the exhaust line according to a predetermined time chart.

Next, the gear pump cannot be driven by the interlock unless the conditions of the lower limit temperature in the melter and the inert gasification in the melter are satisfied. However, if these conditions are satisfied, the servo motor will be operated. The gear pump is rotated by, the thermo-melted thermoplastic synthetic resin is fed into the heat hose, and the thermo-melted thermoplastic synthetic resin is sprayed or applied to the substrate to be coated from the coating nozzle with heating, and can be used as an adhesive. It can be widely used in various industries.

Further, in the case of an elongated one such as a string-like solid thermoplastic synthetic resin, it is put into a hopper in a spiral shape, and even when a sheet-like one is used, it is folded into a block shape and put into the hopper. However, as described above, it is heat-melted as in the case of the block-shaped solid thermoplastic synthetic resin.

Next, in the case of fine-grained solid thermoplastic synthetic resin in the form of beads, pellets, or chips, preheating of the hopper and preheating melter is not necessary, and the heat source is not heated, so the guide plate The preheating fins act as a baffle and prevent free fall.

When the operation is continued in this manner, the amount of the thermoplastic synthetic resin that has been melted in the melter naturally decreases with the lapse of time. Therefore, when a certain level is reached, for example, the level switch sends a signal. And open the lid to reinforce the thermoplastic synthetic resin based on this signal,
For example, a sensor provided on the lid operates to generate a signal, and based on this signal, by supplying the heated inert gas from the inert gas supply line with the lid open,
Since it can be maintained in the inert atmosphere, it is possible to prevent the surface of the thermoplastic synthetic resin stored in the storage recess of the high temperature melter and thermally fused from being oxidized. Thus
When the lid is closed immediately after replenishing the thermoplastic synthetic resin, the sensor provided on the lid operates and the supply of the inert gas from the supply line is stopped. Can be kept. Next, during continuous operation, after supplying an inert gas from the supply line for a few seconds, the process of exhausting a small amount from the exhaust line is repeated at regular intervals to constantly maintain an inert gas atmosphere in the melter. be able to. Therefore, it is possible to keep resource saving by setting the consumption of the inert gas to a minimum.

In addition, in order to prevent troubles such as rupture caused by the pressure of the gear pump outlet rising and the pressure resistance of the heat hose being exceeded, the coating nozzle with heating is blocked under some circumstances, and a certain value is set. When the pressure rises above the above, the safety relief valve in the pressure rise prevention means operates, and the molten thermoplastic synthetic resin at the gear pump outlet is returned to the funnel-shaped reservoir recess of the high temperature melter to prevent the pressure rise at the gear pump outlet. . At the same time, the rotation speed of the servo motor can be reduced, but the selection is arbitrary depending on the properties of the thermoplastic synthetic resin used.

[0014]

The details of the present invention will be described with reference to the embodiments shown in the drawings.

The melting device A for thermoplastic synthetic resin is a device for melting a thermoplastic polymer material, especially a highly viscous substance, and as shown in FIG. 1, a hopper 1, a preheating melter 2, and a heating device. The melter 3, the high-temperature melter 4, the lid 5, the exterior heat insulating member 6, the inert gas filling means 7, and the coating means 8 are included. Further, the pressure rise preventing means 9 and the filter 10 in the high temperature melter 4 are components.

As shown in FIG. 2, the hopper 1 is provided with a guide plate 11 which also serves as a baffle along a downward flow below a hollow interior having an open upper surface and a lower surface for charging a thermoplastic synthetic resin. One or a plurality of them are provided, and a heat source 11a for heating as needed is embedded in an appropriate place of the guide plate 11 in the central portion in the example of the drawing. That is, when a block-shaped lump, a strip-shaped elongated one in a spiral shape, or a sheet-shaped folded one in a block shape is melted by heat, a guide plate
In the case of roughly cutting by heating the heat source 11a of 11 and heat-melting fine particles such as beads, pellets, and chips, the guide plate 11 is not heated and the guide plate 11 is blocked. Is used as. A heat insulating seal packing 12 is interposed between the preheating melter 2 and the hopper 1 described below to separate the preheating melter 2 in order to create a temperature difference with the preheating melter 2. This is because the temperature inside each melter is separated, the temperature inside each melter is accurately controlled, and the melting due to the temperature difference is controlled to prevent oxidation and carbonization. Instead of interposing the heat-insulating seal packing 12, the hopper 1 can be made of a material such as stainless steel having poor heat conductivity. At that time, the exterior heat insulating member 6 to be applied to the hopper 1 can be removed. it can.

The preheating melter 2 is located below the hopper 1, and is provided with a preheating fin 13 also serving as a baffle plate for middle cutting along a downward flow in a hollow interior having an open upper surface and a lower surface, A heat source 14 is embedded in an appropriate position of the preheating fin 13. As shown in FIG. 2, the preheating melter 2 in the illustrated example has a contact area that is gradually reduced, and has a shape in which the thermoplastic synthetic resin is squeezed downward from the middle so that it can be melted even on a wall surface. The preheating fins 13 also serving as baffles are arranged so as to be directed toward the center, and the preheating fins 13a are arranged in the lower portion of the preheating melter 2 in a direction crossing the flow, and the heat source 14 is provided to the preheating fins 13a. It is buried. The preheating fins 13 also serve as a baffle by using the heat source 14 after cutting. Further, between the heating melter 3 and the preheating melter 2 which will be described below, in order to prevent oxidation and carbonization, a heat insulating seal packing 12 is similarly provided.
The temperature separation is performed in order to create a temperature difference with the heating melter 3 by interposing a.

The heating melter 3 is located below the preheating melter 2 and has a large heat transfer area for slicing along a downward flow in a hollow interior having open upper and lower surfaces. A heating fin (15) also serving as a grid-shaped baffle is provided, and a heat source (16) is embedded in an appropriate place. As shown in FIG. 2, in the heating melter 3 of the illustrated example, heat is transferred from the heat source 16 to the entire heating melter 3 as in the case of the preheating melter 2, so that the heat transfer area is also increased. In order to be able to melt any of the contact areas, the shape is squeezed in order to reduce gradually as it goes downward. In addition, between the high temperature melter 4 and the heating melter 3 described below, a heat insulating seal packing 12 is similarly provided.
Temperature separation is performed in order to make a temperature difference with the high temperature melter 4 by interposing b.

The high-temperature melter 4 is located below the heating melter 3 and has a storage recess 17 for thermally melting the thermoplastic synthetic resin.
And has a heat source 18 buried therein. Further, in the example shown in the figure, as shown in FIG.
Heating fins 17 'are provided inside 17 to increase the heat transfer area.
A gear pump 19 is attached to the side surface or the lower surface of the high temperature melter 4, and the main body of the high temperature melter 4 has a communication port 20 communicating with the storage recess 17 and the suction port of the gear pump 19, and a transport port 21 from the discharge port of the gear pump 19. The cartridge type filter 10 is attached in the middle of the transportation port 21 for easy replacement. The filter 10 may be located at the inlet of the gear pump 19.

As shown in FIG. 2, the pressure rise preventing means 9 is provided with a return port 22 which communicates the transport port 21 and the storage recess 17 in the high temperature melter 4, and a safety relief valve is provided in the return port 22.
When the pressure at the outlet of the gear pump 19 rises above a certain value, the safety relief valve 23 operates against the elastic member 23a such as a coil spring to move in the direction of the arrow in the figure. Unblock the return port 22,
By returning the molten thermoplastic synthetic resin at the outlet of the gear pump 19 to the funnel-shaped reservoir recess 17 of the high-temperature melter 4 where the flow becomes easy as shown by the arrow in the figure, the pressure rise at the outlet of the gear pump 19 can be prevented. .

The heat sources 11a, 14, 16, 18 are the sheath heaters cast at the same time as the casting, or the sheath heaters are inserted in close contact with the drilled mounting holes, or It may be one that heats and melts by circulating a heating medium such as steam or heating oil in the mounting hole.

The lid 5 closes the upper surface of the hopper 1 and hermetically seals the inside. Particularly, in the illustrated example, the lid 5 is attached to the upper surface of the hopper 1 with a heat insulating seal packing 12c interposed therebetween. A member 24 is provided, and is attached to the upper surface of the attachment member 24 via a packing 25 so that it can be freely opened and closed.
Further, since the opening and closing of the lid 5 affects the internal temperature change and oxidation due to air contact, a sensor for opening and closing display is provided, although not particularly shown.

The exterior heat insulating member 6 is composed of the melters 1, 2, 3, 4
A heat insulating space is provided between the hopper 1, the preheating melter 2, the heating melter 3 and the high temperature melter 4 in order to prevent heat dissipation to the outside, maintain an appropriate temperature inside and prevent burns. Part 26
Is provided. Particularly, since the heat insulating space portion 26 is provided between the surface of the hopper 1, the preheating melter 2, the heating melter 3, the high temperature melter 4 and the exterior heat insulating member 6, forced convection is prevented and the heat insulating space is prevented. The temperature of the portion 26 is not escaped, and the heat insulation and heat insulation by air can enhance the energy saving measures and the heat insulation effect. In the case of a thermoplastic synthetic resin having a low melting temperature, it may be directly wound for cost reduction.

The inert gas sealing means 7 is provided with a conduit 27 as shown in FIG.
It is composed of a supply line 28 for supplying the inside and an exhaust line 29 for exhausting the gas filling the inside. Here, the flow rate of the supply line 28 is such that the inert gas filter 30, the electromagnetic valve 31, the fine pressure adjusting valve 32, the fine flow rate adjusting valve 33, and the bypass bypass valve 34 are piped in this order from the supply source as shown in FIG. Control means 35
A heater 36 located in the heat insulating space 26 is provided on the way, and the pipe 27a is connected to the hopper 1. Next, the exhaust line 29 is an ON-OF which uses a solenoid valve on the way.
F exhaust valve 37, check valve with check valve 38 are attached in order,
The pipe 27b is connected to the hopper 1.

As shown in FIG. 1, the coating means 8 has a flexible structure in which a servomotor 39 is directly connected to a gear pump 19 via a coupling 40, and a heating heater is built in the discharge side of the transportation port 21 to keep heat. A heat hose 41 is connected, and a heating application nozzle 42 having a built-in heater is attached to the end of the heat hose 41 via an electromagnetic valve 43.

The melters 1, 2 are controlled by temperature control means such as a microprocessor in an electric control panel 46 provided outside the system.
Due to the property of the thermoplastic synthetic resin, the viscosity slightly changes with respect to the set temperature value in which the temperature inside 3 and 4 is set to a high temperature in a stepwise manner. Therefore, the heat hose 41 is controlled within the range of around 0.5 ° C.
And, the temperature of the coating nozzle 42 with heating is controlled, and the thermoplastic synthetic resin melted to a necessary and appropriate temperature is controlled by the gear pump 19 connected to the automatically controllable servo motor 39 in a constant amount and a necessary amount. By pressure, liquid can be sent to the heat hose 41 having the coating nozzle 42 with heating at the tip, and the controller control system of the servomotor 39 can automatically stop and automatically change the gear pump 19.

Further, the servo motor 39 is surrounded by a protective safety cover 45 having punch holes 44 formed therein.

Further, the inert gas supplied by the inert gas filling means 7 means preheated nitrogen gas and carbon dioxide gas.

Further, the hopper 1, the preheating melter 2, the heating melter 3, the high temperature melter 4, the gear pump 19, the heat hose 41 and the like in the melting device A are provided with a fluorine lining on the contact part and the liquid contact part of the hot melt. , For example, PTFE, PCTF
Non-adhesive, heat resistant, chemical resistant, abrasion resistant, such as E, FEP, PFA, etc.
By baking and coating the non-energized treatment material, it is possible to prevent the sticking of the high-viscosity hot melt, which conventionally sticks to the wall surface and blocks the pipeline.

In the melting apparatus A of the typical embodiment, the hopper 1, the preheating melter 2, the heating melter 3 and the high temperature melter 4 are constructed as separate members, but all or necessary parts are provided. It is also possible to integrally mold.

Further, particularly when the fine granular solid thermoplastic synthetic resin in the form of beads, pellets, or chips is melted by heat, the heat source 11a of the guide plate 11 is operated without heating, for example, a hopper. It is also possible to use a device such as stainless steel, which has poor heat conduction, as the material of No. 1 and which does not keep the parts of the hopper 1 and the lid 5 by the exterior heat insulating member 6.

The order of preheating the temperature of the melting vessel or charging the solid thermoplastic synthetic resin is not critical, but an example of the operation is as follows. Open, the block-shaped, bead-shaped, pellet-shaped, chip-shaped, and string-shaped solid thermoplastic synthetic resin is charged from the hopper 1, the lid 5 is closed, and the supply line in the inert gas sealing means 7 is closed.
The inert gas heated by the heater 36 is supplied from the 28 to make the insides of the melter 1, 2, 3, 4 inert atmosphere and heat source.
11a, 14, 16, 18 are preheated and the thermoplasticity of the interior is reached when the set temperature set in the hopper 1, the preheating melter 2, the warming melter 3 and the high temperature melter 4 is gradually increased to a high temperature. Since the synthetic resin material is melted by heat, the interlock enabling the driving of the gear pump is released, and the melter of the thermoplastic synthetic resin can be used.

The dissolution procedure will be described in more detail. In the case of a block-shaped lump of solid thermoplastic synthetic resin,
The injected thermoplastic synthetic resin is heat-melted in a roughly cut shape by passing between the guide plates 11 also functioning as baffles in the hopper 1, and then preheating which also serves as a baffle in the preheating melter 2. It is melted by the fins 13 for melting and further melted into a medium cut shape,
Then, by being finely cut by the heating fins 15 also serving as a grid-shaped baffle in the heating melter 3, the solid thermoplastic synthetic resin gradually comes into contact with a high temperature and gradually melts into a rod-shaped molten lump. When the heat source 18 in the storage recess 17 that facilitates the flow of the high-temperature melter 4 gradually melts the thermoplastic synthetic resin to the core, and the internal pressure increases due to the supply pressure of the inert gas, the sensor (particularly (Not shown) operates to stop the supply of the inert gas, and the exhaust valve 37 opens according to a predetermined time chart, and the minute amount regulating valve 38 with a check valve controls the flow rate to exhaust the gas.

Next, the gear pump 19 cannot be driven by the interlock unless the conditions for setting the lower limit temperature in the melter and inert gasification in the melter are satisfied, but when these conditions are met, melting is performed. When the temperature reaches the set temperature, the servomotor 39 rotates the gear pump 19 to send the heat-melted thermoplastic synthetic resin to the heat hose 41, and the solenoid valve 43 is opened to heat the coating nozzle 42 with heating by the pressure of heated air. Depending on the required amount and area of the molten thermoplastic synthetic resin,
By using a nozzle suitable for a required shape pattern, it can be sprayed or coated on a substrate to be coated and used for various purposes.

In the case of a long and narrow one such as a string-like solid thermoplastic synthetic resin, it is spirally put into the hopper, and in the case of a sheet-like one, it is folded and put into the block into the hopper 1. As described above, it is heat-melted as in the case of the block-shaped solid thermoplastic synthetic resin.

Further, in the case of fine-grained solid thermoplastic synthetic resin in the form of beads, pellets, or chips, preheating of the hopper 1 and the preheating melter 2 is unnecessary, and the heat source 11
Since a and 14 are not heated, the guide plate 11 and the preheating fins 13
Acts as a baffle and prevents free fall.

When the operation is continued in this way, the inside of the melter 1,
Since the amount of the thermoplastic synthetic resin melted in 2, 3, and 4 naturally decreases with the lapse of time, when a certain level is reached, a signal from a level switch (not particularly shown) works, and When the lid body 5 is opened to replenish the hot melt raw material based on the signal, a sensor (not shown) provided on the lid body 5 operates to emit a signal. On the basis of this signal, the heated inert gas can be supplied from the supply line 28 with the lid 5 opened to maintain the inert atmosphere, so that the storage recess 17 of the high-temperature melter 4 can be stored in the storage recess 17. It is possible to prevent the surface of the thermoplastic synthetic resin that has been stored and heat-melted from undergoing a temperature change to have a change in viscosity, resulting in poor flow and oxidation due to the influence of air. Thus, when the lid 5 is closed promptly after the thermoplastic synthetic resin is replenished, a sensor (not shown) provided on the lid 5 is activated to supply the inert gas from the supply line 28. When stopped, the inside of the melters 1, 2, 3, and 4 can be constantly maintained in an inert gas atmosphere. Next, during continuous operation, the supply line for several seconds
After supplying the inert gas from 28, the process to perform small amount exhaustion is performed by exhausting from the minute adjustment valve 38 with check valve in the exhaust line 29 to supply new nitrogen gas and carbon dioxide. By repeating the cycle, the insides of the melters 1, 2, 3 and 4 can always be kept in an inert gas atmosphere. Therefore, it is possible to keep resource saving by setting the consumption of the inert gas to a minimum.

Further, the coating nozzle with heating under some circumstances
In order to prevent troubles such as rupture that occurs when 42 stops and the pressure at the outlet of the gear pump 19 rises to exceed the pressure resistance of the heat hose, when it rises to a certain value, for example, a coil spring in the pressure rise prevention means 9 Elastic member 23
Contrary to a, the safety relief valve 23 operates and moves in the direction of the arrow in FIG. 2 to release the closed state of the return port 22 and remove the gear pump.
The molten thermoplastic synthetic resin at the outlet of 19 can be returned to the storage recess 17 where the flow can be facilitated, and the pressure increase at the outlet of the gear pump 19 can be prevented. Or, depending on the type of hot melt, the controller of the servomotor 39 can automatically control the rotation speed to eliminate the abnormal pressurization phenomenon.

As described above, according to the melting apparatus A of the representative embodiment of the present invention, a block-shaped lump or a string-shaped elongated member is made into a spiral shape or a sheet-shaped member is folded into a block shape. The material is heat-melted in a roughly cut shape by passing between the guide plates 11 which also function as baffles in the hopper 1 in an inert gas atmosphere, and then preheating which also serves as a baffle in the preheating melter 2. It is melted by the fins for heating 13 and further cut into a medium cut shape, and is gradually solidified by being finely cut into a rod shape by the heating fins 15 also functioning as a grid-shaped baffle plate in the heating melter 3. The thermoplastic synthetic resin is gradually brought into contact with high temperature to form a rod-shaped molten blob, and the heat source 18 gradually heat-melts the thermoplastic synthetic resin to the core in the funnel-shaped storage recess 17 of the high-temperature melter 4. The temperature control of the synthetic resin causes Since rapid dissolution due to temperature and dissolution in air are prevented, it is possible to prevent oxidation, carbonization, curing and deterioration of the thermoplastic synthetic resin. Moreover, beaded,
In the case of a pellet-shaped or chip-shaped fine-grained solid thermoplastic synthetic resin, preheating of the hopper 1 and the preheating melter 2 is unnecessary, and the heat sources 11a and 14 are not heated.
The preheating fins 13 and the preheating fins 13 function as baffle plates and prevent free fall. Therefore, solid thermoplastic synthetic resins of all types and shapes can be melted by the single melting device A. Of course, a heat source that can handle the melting temperature of the material must be secured.

Further, the gear pump 19 in the high temperature melter 4
Since the pressure rise prevention means 9 is provided at the outlet, even if the coating nozzle 42 with heating stops under some circumstances, it is possible to prevent the pressure rise in the heat hose 41 and the outlet of the gear pump 19, which is conventionally required. The internal pressure inside the heat hose 41, which was too high, was prevented from bursting and sudden ejection from the tip of the coating nozzle 42 with heating. To filter 10
Since the above is provided, it is possible to remove foreign matters and the like that adversely affect the quality of the adhesive material and cause clogging of the heat hose 41 and the coating nozzle 42 with heating.

Further, the supply line of the inert gas sealing means 7
When low-pressure inert gas is intermittently supplied by 28, the gas filling the inside is exhausted little by little by the exhaust line 29, and the balance in the melters 1, 2, 3, 4 is maintained. It saves a lot of gas. Further, the temperature control means such as a microprocessor is used to melt the melters 1, 2, 3,
Since the inside of 4 is controlled to an appropriate temperature, it is possible to minimize the sudden temperature change and perform stable temperature control of the adhesive material.
It prevents some stickiness, oxidation and carbonization, prevents thermal deterioration, and does not deteriorate the effect as an adhesive.

[0042]

Since the present invention is constructed as described above, it has the following effects. In the melter according to claim 1, a block-shaped lump or a string-shaped elongated member is made into a spiral shape, or a sheet-shaped member is folded into a block shape, and the baffle plate in the hopper in an inert gas atmosphere. It is melted and cut into rough cuts by passing between the guide plates that also serve as the cut plates, and then it is melted by the preheating fins that also serve as the baffle plates in the preheating melter, and is further melted in the middle cut form, and then for heating. By being finely cut by the heating fins that also serve as a grid-shaped baffle in the melter, the solid thermoplastic synthetic resin is gradually brought into contact with high temperature to form a rod-shaped melted agglomerate. In the funnel-shaped reservoir recess where heating fins are installed to increase the heat transfer area, the heat source gradually melts the thermoplastic synthetic resin to the core, so that the temperature control of the thermoplastic synthetic resin causes rapid heating. Yo To prevent dissolution in rapid dissolution and air, oxidation of the thermoplastic synthetic resin, carbide, hardened, it is possible to prevent deterioration. Moreover, in the case of fine-grained solid thermoplastic synthetic resin in the form of beads, pellets, or chips, preheating of the hopper and preheating melter is not required and the heat source is not heated, so the guide plate and preheating fins Acts as a baffle,
It plays the role of preventing free fall. Therefore, solid thermoplastic synthetic resins of all types and shapes can be heat-melted by a single melting device. Of course, a heat source that can handle the melting temperature of the material is secured. Further, when the low-pressure inert gas is intermittently supplied through the supply line of the inert gas charging means, after that, the gas filling the inside is exhausted little by little by the exhaust line to maintain the balance in the melter, This greatly reduces the amount of inert gas used. Furthermore, since the temperature inside the melter is controlled to an appropriate temperature by temperature control means such as a microprocessor, it is possible to minimize sudden temperature changes and perform stable temperature control of the adhesive, and prevent oxidation and carbonization. In addition, since the shape does not cause retention, thermal deterioration is prevented, and the effect as an adhesive is not thermally deteriorated. In the melter of claim 2, since the pressure rise preventing means is provided at the gear pump outlet in the high temperature melter, even if the coating nozzle with heating is closed under some circumstances, the pressure in the heat hose or the gear pump outlet is increased. It is possible to prevent the rise, and since a filter is installed at the inlet or outlet of the gear pump in the high temperature melter, it may adversely affect the quality of the adhesive material and may cause clogging of the heat hose and the coating nozzle with heating. It is possible to remove the foreign matter, etc. that cause dust.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a typical embodiment of a heat melting and melting apparatus for thermoplastic synthetic resin according to the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of the same melter.

[Explanation of symbols]

A Thermomelting / melting device for thermoplastic synthetic resin 1 Hopper 2 Preheating melter 3 Heating melter 4 High temperature melter 5 Lid body 6 Exterior heat insulating member 7 Inert gas filling means 8 Coating means 9 Pressure rise preventing means 10 Filter 11 Guide plate 12 Insulation seal packing 13 Preheating fin 14 Heat source 15 Heating fin 16 Heat source 17 Storage recess 18 Heat source 19 Kia pump 20 Communication port 21 Transport port 22 Return port 23 Safety relief valve 24 Mounting member 25 Packing 26 Insulating space Part 27 Conduit 28 Supply line 29 Exhaust line 30 Inert gas filter 31 Solenoid valve 32 Fine pressure adjustment valve 33 Fine flow rate adjustment valve 34 Bypass valve 35 Flow rate control means 36 Heating heater 37 Exhaust valve 38 Minute adjustment valve with check valve 39 Servo motor 40 Coupling 41 Heat hose 42 Coating nozzle with heating 43 Solenoid valve 44 Punch hole 45 Protective safety cover 46 Electric control panel

Claims (2)

[Claims] 1. A guide plate also serving as a baffle plate for rough cutting is provided along a downward flow in a hollow interior having an open upper surface and a lower surface, and a heat source for heating is buried in an appropriate place of the guide plate. And a preheating fin located below the hopper and having an upper surface and a lower surface opened along the downward flow and also serving as a baffle plate for medium cutting, and the preheating fin is provided at an appropriate position. A preheating melter in which a heat source for heating as needed is embedded, and a cross-cutting grid along a downward flow in a hollow interior located below the preheating melter and having an upper surface and a lower surface opened. Heating fins that also function as a baffle plate and have a heat source embedded in a suitable place, and heating that melts the thermoplastic synthetic resin under the heating melter. It has a funnel-shaped storage recess with fins in place to facilitate the flow and fills the heat source. A high-temperature melter that is installed, a lid that closes the upper surface of the hopper to make the inside airtight, and to prevent heat dissipation to the outside to keep the inside of the melter at an appropriate temperature and prevent burns, melt It is composed of an exterior heat insulating member provided with a heat insulating space between it and the surface of the vessel, a supply line for supplying an inert gas to the inside of the melter, and an exhaust line for exhausting the gas filling the inside. A gear pump with an inert gas filling means and a temperature control means such as a microprocessor that controls the interior temperature of the melter to an appropriate temperature, and the thermoplastic synthetic resin melted to the necessary and appropriate temperature is connected to a servomotor that can be automatically controlled. Can be used to deliver a required and appropriate amount to a heat hose that has a coating nozzle with heating at the tip at a fixed amount and pressure, and the controller for automatic control of the servo motor automatically stops the gear pump and automatically A thermomelting / melting apparatus for a thermoplastic synthetic resin, which comprises a coating means capable of variable movement. 2. In the high temperature melter, when the pressure at the outlet of the gear pump rises above a certain value, the safety relief valve operates and the molten thermoplastic synthetic resin at the outlet of the gear pump is transferred to the funnel-shaped reservoir recess of the high temperature fuser. 2. A pressure rise preventing means for circulating the flow is provided, a filter is provided at the inlet or outlet of the gear pump, and when the safety relief valve is actuated, the rotation speed of the servo motor is automatically controlled as required.
A device for melting and melting a thermoplastic synthetic resin as described.