JP3485621B2 - Method for reusing non-product resin in resin molding system and resin molding system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing non-product resin such as burrs which occurs when resin molding is mainly carried out using polyester resin such as polyethylene terephthalate (PET), and the resin therefor. Regarding improvement of molding system.

[0002]

2. Description of the Related Art As is well known, when a polyester resin bottle container (PET bottle) is manufactured by a direct blow molding method, a tubular parison is sandwiched between a pair of molds from the left and right sides. And the bottom side becomes burr. Since this burr usually accounts for 30% to 40%, it is desired to reuse such a non-product resin from the viewpoint of effective utilization of resources. On the other hand, such a polyester resin has a property of mutually transitioning into two modes of a crystalline state and an amorphous state due to a difference in molecular arrangement, and the polyester resin heated and melted in the molding machine is When it is extruded from and quenched, it becomes amorphous. Further, in such an amorphous state, the hygroscopicity of the resin is higher than in the crystalline state, and the surface thereof is activated upon heating. Therefore, when the burr separated from the resin molded product made of polyester resin is reused, the crushed material is heated and dried by the dehumidifying and drying device only by crushing the amorphous burr into pellets. At this time, the surface is activated and the tackiness is increased, so that the crushed materials adhere to each other. In this case, the pulverized material solidifies in a so-called dumpling shape, and the pulverized material cannot be properly re-supplied to the molding machine.

Therefore, conventionally, as a method for solving the above-mentioned problems, for example, a method as shown in FIG. 5 has been proposed. That is, in this conventional method, the burr B separated and taken out from the resin molded product (not shown) molded by the molding machine 1 such as a blow molding machine is conveyed to the crusher 4E by the conveyor 2E, and the burr B is Is crushed, and then the crushed burr is put into a heating device 3E as a crystallization device to crystallize. According to this method, since the burr B is crystallized by the heating device 3E, even if the burr B is mixed with the virgin material by the mixing device 5E and then put into the dehumidifying / drying device 6E and reheated, the burr B is no longer At this time, the surface of the burr B is not activated. Therefore, it is possible to eliminate the risk that the crushed material of the burr B is solidified in a so-called dumpling shape in the dehumidifying / drying device 6E, and it is possible to properly recharge the molding machine 1.

[0004]

However, the above-mentioned conventional method has the following problems. That is,
In a polyester resin, if the water content during heating for crystallization is large, hydrolysis occurs during crystallization and the molecular weight decreases. Such a decrease in molecular weight causes deterioration of physical properties such as mechanical strength and intrinsic viscosity (IV value) of the resin material. In order to improve the quality of the resin molded product, this decrease in molecular weight is prevented as much as possible. There is a need to. When the molecular weight of the resin decreases and the intrinsic viscosity decreases, for example, when blow molding a bottle container, when making a tubular parison, the wall thickness of the upper side of the parison becomes thin due to the weight of the parison and the like. . Then, if this is blow-molded, an inappropriate bottle container in which the bottle mouth on the upper side is extremely thin is formed. Therefore, in order to improve the quality of the resin molded product when the burr B is reused, it is necessary to reduce the water content of the burr B when the burr B is heated and crystallized.

However, in the above conventional method, the burr B is separated from the resin molded product and taken out, and then the heating device 3E is used.
Until it is heated and heated (corresponding to range Sa)
Burrs B are in an amorphous state. On the other hand, as described above, when the polyester resin is in an amorphous state, it has a property of easily absorbing moisture in the air as compared with when it is in a crystalline state.
Therefore, in the above-mentioned conventional method, the amorphous burr B absorbs moisture such as air in a relatively long time from the resin molding by the molding machine 1 until the burr B is crystallized by the heating device 3E. There was a situation in which a large amount of moisture was absorbed. Also,
The large amount of moisture absorption of the burr B is due to the fact that the burr B has a large amount of moisture absorption before crystallization.
It was also caused by the fact that the pulverized material had a large surface area. As a result, conventionally, when crystallized by the heating device 3E, the burr B is hydrolyzed, and the physical properties of the regenerated resin are deteriorated. There has been a problem that the quality of the obtained resin molded product is deteriorated.

Further, conventionally, when the crushed burr B is crystallized by the heating device 3E, the crushed materials (burrs B) are adhered to each other due to the activation of the surface thereof. In order to prevent the above, it is necessary to heat the pulverized material while stirring it by providing a stirring blade in the heating device 3E. As a result, the structure of the heating device 3E is complicated and the cost thereof is high.

The above-mentioned difficulties are not limited to the case where the burrs generated during blow molding are reused, and the same problems occur when the other non-product resins are reused.

The present invention has been proposed in view of the above points, and when a non-product resin such as a polyester resin which is easily hydrolyzed when heated is crystallized and reused, the molecular weight of the non-product resin is hydrolyzed. It is an object of the present invention to prevent the deterioration of the physical properties of the resin due to decomposition, and to make it suitable for the resin molding application again.
Another object of the present invention is to eliminate the need to use a complicated heating device having a structure including a stirring blade as a heating device and to simplify the configuration of the entire system.

[0009]

A method for reusing a non-product resin in a resin molding system according to the present invention as set forth in claim 1, which is proposed to achieve the above object, is a resin molding formed by a molding machine. In this method, a non-product resin separated and taken out from a product is heated by a heating device to be crystallized before being crushed by a crusher.

The method for reusing a non-product resin in a resin molding system according to a second aspect of the present invention is different from the method for reusing a non-product resin according to the first aspect, wherein the non-product is separated and taken out from the resin molded article molded by the molding machine. In this method, the non-product resin is crystallized by heating while crushing the resin with a crusher.

According to a third aspect of the present invention, there is provided a method for reusing a non-product resin in a resin molding system according to the first or second aspect, after the crystallization and pulverization of the non-product resin is completed. In this method, a virgin material is mixed with this non-product resin, and then these mixed materials are dried by a dehumidifying and drying device and then re-supplied to a molding machine.

According to a fourth aspect of the present invention, there is provided a resin molding system in which a non-product resin separated from a resin molded product molded by a molding machine is crushed, and the non-product resin is crushed. A resin molding system including a heating device for heating and crystallizing, wherein non-product resin separated and taken out from a resin molded product is transferred to the heating device and crystallized by the heating device. A transfer means for the non-product resin for supplying the non-product resin to the crusher is provided.

According to a fifth aspect of the present invention, in the resin molding system according to the fourth aspect of the present invention, the transfer means for the non-product resin crushes the non-product resin separated and taken out from the resin molded product. The heating device is configured as a tunnel type heating device using microwaves or far infrared rays, which is provided at a portion of the transport path of the transport conveyor.

According to a sixth aspect of the present invention, there is provided a resin molding system according to the fourth or fifth aspect, wherein a mixing device for mixing the virgin material with the resin pulverized by the pulverizer is provided. A dehumidifying / drying device for drying the mixed resin, and a resin transfer means for recharging the resin dried by the dehumidifying / drying device into the molding machine are provided.

[0015]

In the method for reusing a non-product resin in the resin molding system according to the present invention having the above-mentioned structure, the non-product resin is crystallized earlier than crushing the non-product resin. It is possible to shorten the time from the separation and removal of the resin from the resin molded product to the crystallization, that is, the time during which the non-product resin is in the amorphous state by the time required for the pulverization treatment of the non-product resin. Therefore, it becomes possible to reduce the amount of water absorbed by the non-product resin before it is crystallized. Further, since the non-product resin has not been crushed at the time of performing the crystallization treatment, the water content of the non-product resin can be reduced due to the small surface area of the non-product resin. Therefore, during the crystallization process, the non-product resin can be heated in a state where the water content is small, so that the non-product resin is unlikely to cause hydrolysis, and this hydrolysis reduces the physical properties of the non-product resin. It is possible to eliminate such a fear or reduce the width of the decrease.

Further, since the non-product resin in a non-pulverized state is crystallized by a heating device and then this crystallized non-product resin is pulverized by a pulverizer, a stirring blade is incorporated in the heating device to perform pulverization. There is no need to bother to prevent the treated non-product resins from adhering to each other.

In the method for reusing a non-product resin in a resin molding system according to a second aspect of the present invention, the non-product resin is crushed by a pulverizer and simultaneously heated to be crystallized. As in the case of, the non-product resin can be crystallized earlier than the case where the non-product resin is pulverized and then crystallized, and the period during which the non-product resin is in the amorphous state can be shortened. Also, due to the small surface area of the non-product resin until pulverization and crystallization treatment,
The water content of the non-product resin can be kept low. Therefore, by suppressing the water content when the non-product resin is heated and crystallized, it is possible to prevent or suppress the deterioration of the physical properties of the non-product resin due to hydrolysis, as in the case of claim 1. Will be possible. Further, since the crushing process and the heating process are executed at the same time, it is not necessary to use a complicated heating device having a structure including a stirring blade after that, and the system structure can be simplified.

In the method for reusing the non-product resin in the resin molding system according to the third aspect of the present invention, the virgin material is mixed with the non-product resin that has been crystallized and pulverized to obtain the resin material. The consumed amount can be supplemented with virgin material. Then, after the mixed material of the virgin material and the non-product resin is dried by the dehumidifying and drying device and then supplied to the molding machine, the non-product resin can be effectively recycled and used for the molding operation of the desired resin molded product. Becomes

In the resin molding system according to the fourth aspect of the present invention, the non-product resin separated and taken out from the resin molded product is transferred to the heating device by the transfer means for the non-product resin, and then this heating is performed. The non-product resin crystallized by heating in the apparatus can be fed to the crusher, and the method according to the present invention as set forth in claim 1 can be properly carried out.

In the resin molding system according to the fifth aspect of the present invention, the non-product resin separated and taken out from the resin molded product is transferred to the crusher by the conveyor and is being supplied to the pulverizer. The non-product resin can be heated and crystallized by microwave or far infrared. With such a device configuration, crystallization can be achieved while the non-product resin is being supplied to the crusher by one conveyor.
Non-product resin can be transferred smoothly. In addition, heating by microwaves or far infrared rays raises the temperature quickly and is not heating using air as a medium. Therefore, adverse effects of air (moisture, etc.) on the non-product resin can be reduced.

In the resin molding system according to the sixth aspect of the present invention, the virgin material can be mixed with the virgin material in the non-product resin that has been crystallized and pulverized by a mixing device.
Further, after the mixed resin is dried by the dehumidifying and drying device, it can be transferred to the molding machine by the resin transfer means and reloaded. Therefore, the method according to the present invention as set forth in claim 3 can be appropriately carried out, and the non-product resin can be effectively used as a resin molding material.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is an explanatory view showing a resin molding system according to a first embodiment of the present invention. This resin molding system includes a molding machine 1, a conveyor 2 and a conveyor 2.
It is equipped with a tunnel-type heating device 3, a crusher 4, a mixing device 5, a dehumidifying and drying device 6 and the like, which are provided in the middle of the transport path of the above.

Among the above, as the molding machine 1, for example, a blow molding machine is applied. As shown in FIG. 2 (a), this molding machine 1 extrudes and molds a tubular parison 12 from a die 10 at the tip thereof. The parison 12 is sandwiched between a pair of molds 13a and 13b on both sides thereof, and then these molds 13a and 13b are arranged as shown in FIG.
By moving as shown in (b) and then air is blown from the upper part of the parison 12, the mold 13a,
A hollow polyester resin bottle container 14 is molded in 13b. Further, the upper and lower parts which are not molded as the bottle container 14 become burrs B, B, which are cut and separated by sandwiching the molds 13a, 13b, and fall downward.

The conveyer 2 receives the burr B which is separated and dropped from the bottle container 14 as described above, immediately conveys the received burr B into the tunnel type heating device 3, and thereafter The burr B is transferred to a position directly above the crusher 4 and is dropped into the charging hopper 40.

The tunnel-type heating device 3 includes a conveyor 2
The heater 3 for irradiating the burr B transferred on the transfer conveyor 2 with microwaves or far infrared rays for heating in the tunnel-shaped housing 30 that surrounds the transfer path.
1 is arranged. However, in the present invention described in claims 1 to 3, it is not always necessary to employ such a tunnel type heating device in heating the burr B, and other types of heating devices can be arbitrarily applied.

The crusher 4 has a structure in which the resin material charged into the charging hopper 40 is crushed by a rotor blade or the like, and the crushed pellet-shaped or powder-shaped resin material (crushed material) is It is dropped and stored in a hopper 41 arranged below.

The mixing device 5 comprises a storage tank 50a for storing the crushed material crushed by the crusher 4 and a storage tank 50b for the virgin material.
The resin materials discharged from 0b are stirred and mixed in the mixing tank 50c at a predetermined mixing ratio. Transfer of the resin material from the hopper 41 of the crusher 4 into the storage tank 50a
This is performed by a pneumatic transportation method in which a negative pressure suction force is generated by an air suction source 8a such as a blower or a vacuum pump in the pneumatic transportation pipe 7a connected to the hopper 41.

As the dehumidifying / drying device 6, a so-called hopper dryer is applied. This is because the dehumidifying / drying heated air dehumidified by the dehumidifying device 61 and heated by the heater 62 is supplied into the hopper dryer main body 60 while the resin material is accommodated in the hopper dryer main body 60. The resin material in the main body 60 is dried. The material is transferred from the mixing device 5 into the hopper dryer body 60 by a pneumatic transportation method using a pneumatic transportation pipe 7b in which a negative pressure suction force is generated by the air suction source 8b. In addition, this dehumidifying and drying device 6
The resin material whose drying process has been completed in 1 is introduced into the molding machine 1 through the pneumatic transfer pipe 7c in which a negative pressure suction force is generated by the air suction source 8c connected to the input hopper section 11 of the molding machine 1. Is configured.

Next, an example of the method for reusing the non-product resin according to the present invention in the resin molding system having the above construction will be described. First, as described with reference to FIGS. 2A and 2B, when the bottle container 14 made of the polyester resin is molded by the molding machine 1, the burr B is taken out along with this, and the burr B is a bottle container. By being separated from 14, it falls on the conveyor 2. In order to ensure the receipt of the burr B on the transport conveyor 2, it is preferable to provide, for example, a hopper or shooter for receiving the burr on the transport conveyor 2. In addition, the burr B dropped on the conveyor 2
Has a low crystallization rate and is in an amorphous state because it is relatively rapidly cooled from a semi-molten state at a high temperature of, for example, about 200 [° C] to about 90 [° C]. The appearance is transparent or nearly transparent.

Next, while transferring the burr B to the crusher 4 side by the conveyor 2, the burr B is heated to the crystallization temperature (about 120 to 150 [° C]) by the tunnel type heating device 3. As a result, the burr B is crystallized and stabilized in a tissue state having a small water absorption rate. Also,
When it is crystallized, it becomes cloudy. Thus, immediately after the burr B is separated from the bottle container 14 and dropped on the conveyor 2, the burr B is immediately heated to be crystallized, before the crystallization process is performed. Bali B
Can reduce the amount of moisture absorbed in the air. Therefore,
In the tunnel-type heating device 3, since the burr B containing a small amount of water is heated and can be crystallized, it is possible to prevent the burr B from being hydrolyzed at the time of heating. It is possible to prevent the decrease in the molecular weight of the resin, or reduce the width of the decrease, and maintain the quality of the burr B in a high quality polyester resin.

In the above crystallization treatment, the burr B is not cooled to room temperature and then heated, but is not sufficiently cooled, for example, 90 [° C].
Since the burr B, which is in a state of residual heat, is heated to the crystallization temperature, the temperature rise width is small and the energy consumption of the tunnel heating device 3 may be small.

Further, since the tunnel type heating device 3 is a heating system using microwaves or far infrared rays, the burr B
The heating time to the deep inside of the product is short, and the burr B
Even if the transfer speed of B is relatively high, the burr B can be sufficiently crystallized. Further, in such a heating method, since air is not used as a heating medium, it is possible to eliminate the problem that the burr B absorbs a large amount of water in the air during heating, and the quality deterioration of the polyester resin due to hydrolysis is further thorough. Can be prevented. When the burr B is heated in the tunnel heating device 3, the surface of the burr B may be temporarily activated and the burr B may adhere to each other, but this can be ground in the next grinding process. So there is no problem.

After the burr B is heated and crystallized as described above, the burr B is charged into the charging hopper 40 of the crusher 4 by the conveyor 2 and crushed by the crusher 4. Let As a result, a crushed material made of polyester resin as a recycled material can be obtained.
As described above, since it has been crystallized in advance by the heat treatment by the tunnel heating device 3, it is more difficult to absorb moisture in the air than in the case of the amorphous state. Therefore,
After that, there is no fear that a large amount of water will be absorbed until it is supplied again to the molding machine 1.

After the burr B is crushed into particles as described above, the crushed material is transported to the mixing device 5 and mixed with the virgin material that has already been crystallized. If only the pulverized material is returned to the molding machine 1, the amount of resin required for molding the bottle container 14 will be insufficient,
This shortage can be covered by virgin material. After that, these mixed resins may be dried by the dehumidifying / drying device 6 and then supplied to the molding machine 1. In the dehumidifying / drying device 6, both the virgin material and the regenerated pulverized material are heated by hot air, but since both of them have already been crystallized, the surfaces of these materials are activated and the materials are improperly connected to each other. There is no need to glue them together like a dumpling.
Therefore, the resin material that is sufficiently dried and is not unduly adhered can be reintroduced into the molding machine 1, and the bottle container 14 of good quality can be manufactured.

[Second Embodiment] FIG. 3 is an explanatory view showing a resin molding system according to a second embodiment of the present invention (the same parts as those in the first embodiment are designated by the same reference numerals). This resin molding system is replaced with the crusher 4 used in the system of the first embodiment, and the crusher 4 having a burr B heat treatment function.
A is used. As the crusher 4A, for example, a crusher having a structure in which a heater 42 is provided around a casing having a rotary blade for crushing, a device having a means for supplying heated air into the casing, or the like is applied. .

In the resin molding system having the above structure,
The burr B separated and taken out from the bottle container 14 molded by the molding machine 1 is transferred by the transport conveyor 2A and put into the crusher 4A, so that the burr B is heated and crystallized while being crushed. be able to. Even with such a method, the time during which the burr B is in an amorphous state can be shortened, and the burr B can be crystallized by heating in a state where the water content of the burr B is small. Bali B
It is possible to prevent the deterioration of the molecular weight of the polyester resin and the deterioration of the quality.

When the burr B in the amorphous state is heated in the crusher 4A, the surface thereof is temporarily activated, but the burr B is crushed while being stirred in the crusher 4A. Therefore, the crushed burrs do not adhere to each other. Therefore, the crusher 4A discharges an appropriate crushed material that has been crystallized. After that, as in the case of the first embodiment, after mixing with the virgin material in the mixing device 5, those are dried in the dehumidifying / drying device 6, and then these materials are supplied to the molding machine 1. Thus, the burr B described above can be reused to manufacture the bottle container 14 of good quality.

[Other Embodiments] In the first and second embodiments described above, after the burr B is separated and taken out from the bottle container 14, the burr B is immediately transferred to the heating step position by the conveyors 2 and 2A. Although it was transported and heated in a short time to crystallize it, the present invention described in claims 1 to 3 does not necessarily have to do so. In the present invention, for example, as shown in FIG. 4, the burr B separated and taken out from the bottle container 14 is received by the container 9, and a certain amount of burr B is accumulated in the container 9, and then the burr B is collected. B may be carried to the next heating device or the installation location of a crusher that simultaneously performs heating and crushing.

According to this method, since the burr B is not immediately heated to be crystallized, the burr B is in an amorphous state for a long time, but the burr B contained in the container 9 is still crushed. The surface area is small. Therefore, the moisture absorption amount of the burr B can be made smaller than that in the case where the burr B is subjected to the crushing treatment before being crystallized, and the burr B can be made less susceptible to hydrolysis when it is heated. Achievable. Further, if the burr B is crystallized and then crushed, there is an advantage that the amount of resin powder generated during the crushing can be reduced.

In each of the above-mentioned embodiments, the burr B was mixed with the virgin material immediately after the crystallization and crushing treatment was completed, and then these mixed materials were dried and then fed to the molding machine 1. However, the present invention is not necessarily limited to this. For example, after the burr B is crystallized and pulverized, it may be temporarily stocked in a suitable container.

Further, in the above embodiment, the burr B generated when the bottle container 14 is molded is described as an example of the non-product resin, but the non-product resin according to the present invention is not specified. INDUSTRIAL APPLICABILITY The present invention can be applied to other applications, such as reusing a belt-shaped non-product resin such as an ear piece that occurs when performing trimming processing in the case of manufacturing a resin sheet made of polyester resin, for example. Of course. In addition, in the present invention, the specific material of the non-product resin is not limited to the polyester resin, and is suitable for the recycling of a polymer resin which is easily hydrolyzed when heated.

[0042]

As can be understood from the above description, according to the method for reusing a non-product resin in the resin molding system according to the first aspect of the present invention, the non-product resin is converted from the resin molded product. When the period from separation and removal to crystallization can be shortened, and if the non-product resin is not immediately crystallized and the non-product resin is in an amorphous state for a longer period of time Even by maintaining a small surface area of the non-product resin, it is possible to reduce the water content when heating and crystallizing the non-product resin, the molecular weight of the non-product resin is reduced by hydrolysis, It is possible to appropriately prevent the quality from being significantly reduced. Therefore, even when the non-product resin is used again for resin molding, the quality of the resin molded product is not unduly deteriorated, and a special effect that a resin molded product of good quality is obtained can be obtained. can get. In addition, as a heating device used for crystallization of non-product resin, it is not necessary to use a heating device having a large-scale structure in which a stirring blade is incorporated as in the conventional case, which simplifies the system configuration and reduces cost. The advantage that it can be achieved is also obtained.

According to the present invention described in claims 4 to 6,
The method for reusing a non-product resin in the resin molding system according to the present invention as set forth in claims 1 to 3 can be appropriately carried out. Particularly, according to the present invention as set forth in claim 5, the non-product resin is pulverized by a conveyor. While transferring and supplying to the machine,
The non-product resin can be crystallized quickly and efficiently by the microwave or far infrared ray of the tunnel heating device, and unlike the heating method using air as a medium, the non-product resin may be adversely affected by air. The advantage is that it can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a resin molding system according to the present invention.

2A and 2B are explanatory views showing an example of a manufacturing process of a resin molded product manufactured by a molding machine of the resin molding system shown in FIG. 1 and a burr thereof.

FIG. 3 is an explanatory view showing another example of the resin molding system according to the present invention.

FIG. 4 is an explanatory diagram showing an example of a method for reusing a non-product resin in the resin molding system according to the present invention.

FIG. 5 is an explanatory diagram showing an example of a method for reusing a non-product resin in a conventional resin molding system.

[Explanation of symbols]

1 molding machine 2,2A conveyor 3 tunnel type heating device 4,4A crusher 5 mixing equipment 6 Dehumidifying dryer 7a-7c Pneumatic transport tube 8a-8c Air suction source 9 storage containers 10 dice 12 parison 13a, 13b mold 14 Bottle containers (resin molded products) B Burr (non-product resin)

Front Page Continuation (56) References JP-A-56-120310 (JP, A) JP-A-55-154113 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29B 7 / 00-11/14 B29B 13/00-15/06 B29B 17/00-17/02 B29C 35/00-35/18 B29C 49/00-49/46 B29C 49/58-49/68 B29C 49/72- 51/28 B29C 51/42

Claims (6)

(57) [Claims] 1. A method of reusing this non-product resin by performing both a crushing process and a crystallization process by heating of a non-product resin separated and taken out from a resin molded product molded by a molding machine. A method for reusing a non-product resin in a resin molding system, wherein the non-product resin is heated and crystallized by a heating device before the non-product resin is pulverized by a pulverizer. 2. A method of reusing this non-product resin by performing both a pulverization process and a crystallization process by heating of a non-product resin separated and taken out from a resin molded product molded by a molding machine. A method for reusing a non-product resin in a resin molding system, which comprises crystallizing the non-product resin by heating the non-product resin while pulverizing the non-product resin. 3. The virgin material according to claim 1 or 2, after the crystallization and pulverization of the non-product resin is completed, a virgin material is mixed with the pulverized non-product resin, and then these mixed materials are dehumidified and dried. A method for reusing a non-product resin in a resin molding system, which comprises re-supplying to a molding machine after drying with an apparatus. 4. A crusher for crushing a non-product resin separated and taken out from a resin molded product molded by a molding machine, and a heating device for heating and crystallizing the non-product resin. A non-product resin for transferring a non-product resin separated and taken out from a resin molded product to the heating device and transferring the non-product resin crystallized by the heating device to a crusher. A resin molding system, characterized in that it is provided with a transfer means for the resin. 5. The transfer means for the non-product resin according to claim 4, wherein the transfer means is provided with a transfer conveyor provided to transfer and supply the non-product resin separated and taken out from the resin molded product to a crusher, A resin molding system characterized in that the heating device is configured as a tunnel-type heating device using microwaves or far-infrared rays, which is provided at a part of a transfer path of the transfer conveyor. 6. The mixing device according to claim 4 or 5, for mixing the virgin material with the resin crushed by the crusher, and the dehumidifying and drying device for drying the resin mixed by the mixing device. A resin molding system provided with a resin transfer means for re-injecting the resin dried by the dehumidifying and drying device into the molding machine.