JP2002331533A - Method for manufacturing used paper foamed molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a used paper foamed molded product by an in-mold molding process wherein a foamable raw material comprising a paper type foaming material, which is prepared by mixing a foaming agent with a used paper material and a foamable synthetic resin material or a material comprising waste foamed styrol ground to be reduced in volume, is foamed in a mold under heating in a heating process and cooled in a cooling process to obtain the foamed molded product. SOLUTION: In the in-mold molding method, the foamable raw material (c) containing the used paper material is charged in molds 1 and 2 provided with small holes and foamed under heating in the heating process by an ordinary reduced and normal pressure method to mold a foamed molded object which is, in turn, cooled in a waste cooling process using cooling water (b) or a natural cooling process to manufacture the foamed molded product. The used paper material and the foamable synthetic resin material of foamed particles or prefoamed particles or a material prepared by mixing the foaming agent with a material comprising waste foamed styrol ground to be reduced in volume are mixed in an almost equal ratio to form the foamable raw material which is, in turn, charged in the mold to be subjected to in-mold molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed molded article using waste paper, that is, a paper-based foamed material in which a foaming agent is mixed with a waste paper material and a foamable synthetic resin material or a material obtained by grinding and reducing the volume of waste styrene foam. The present invention relates to a method for producing a waste paper foam molded article by in-mold molding of a foamable raw material in a molding die by heating and foaming in a heating step, and cooling in a cooling step to form a molded article.

[0002]

2. Description of the Related Art Generally, waste disposal of various types of paper-based waste paper and used styrofoam containers, which are generated in a large amount in an ever-increasing amount of waste, is troublesome, expensive, and has an effect on air pollution. This is a cause of garbage problems. In particular, incineration of waste paper and waste Styrofoam is a cause of damage to the incinerator and causes air pollution, and there is a high demand for effective recycling in Japan to solve the problem of waste.

[0003]

Conventionally, when a waste paper molded article is manufactured, an appropriate amount of water (for example, waste paper 1)
And a so-called thermoplastic binder such as starch (for example, 50 wt% water with respect to constarch 100) mixed with an appropriate amount of water and mixed with a mixture obtained by mixing water and 70 wt% of water with respect to water. Since there is no mixture, the mixture with a limited weight is filled into every corner of the mold by hand, and then heated and cooled, and manually taken out of the mold to obtain a product. However, when the thermoplastic binder of this molded product is removed from the mold, it is not cured, so care must be taken in handling the molded product. Is necessary and the work is complicated, and
The repaired product is heated and dried in a heating and drying oven at about 180 ° C for about 15 to 20 minutes to cure the thermoplastic binder, resulting in extremely poor productivity, and processing steps such as automatic molding, automatic removal, and automatic stacking. In addition, there are problems such as the difficulty in performing the work, and care must be taken in the handling of the molded products, the work in the post-processing process cannot be easily performed, and the configuration of the manufacturing equipment is complicated and expensive, There was a problem that the management and security were complicated, the manufacturing cost was high, and it was not economical.

[0004] The present invention is intended to eliminate these conventional disadvantages, and can effectively reuse waste paper and waste foamable styrene to contribute to solving the problem of dust. Fibers are entangled with each other and bonded to the synthetic resin material to produce soft, strong and lightweight molded products, which are easy to handle. Processing such as automatic molding-automatic removal-automatic stacking In addition to simplifying the work of the process, since the foaming agent is mixed with the foaming raw material including the waste paper material, the foaming can be easily performed by the heating steam in the molding process, and the productivity is the same as that of the foamable polystyrene molding, and the Because it can be molded, its productivity is higher than that of conventional pulp molds, and it can be used by improving a part of the conventional styrofoam molding equipment. By changing the mold, it is possible to easily form complicated and highly demanded molded products, and the quality of the foamed molded product can be greatly improved. It can be manufactured.

[0005]

According to a first aspect of the present invention, there is provided a molding method for foaming in a molding die according to the present invention. Is filled in a molding die provided with small holes, and heated and foamed by a heating process in a usual manner under reduced pressure and normal pressure in the molding die to form a foamed molded product, and then water-cooled using cooling water. In the in-mold molding method in which a molded article is formed by cooling by a cooling step of leaving and cooling, a foamable raw material obtained by substantially mixing a waste paper material and an expandable synthetic resin material of expanded particles or pre-expanded particles thereof is used. Filled in a molding die and molded in the mold, the fibers of the waste paper material are entangled and joined to the synthetic resin material to form a soft, strong molded product, and the productivity is foamable. Equivalent to styrene molding, Since it is an automatic molding also productivity than conventional pulp mold is high, it can be formed into a paper foam quality.

In the molding method according to the third or fourth aspect of the present invention, the foamable raw material is a waste paper raw material of 50% by weight or more, preferably 50% by weight.
45 to 50 wt% of the foaming agent was mixed with 5 to 30 wt% of the foaming agent and granulated while heating and mixing the foamed material with a reduced volume by crushing the waste foamable styrene to 55 to 55 wt%. The molding contributes to the effective use of waste paper, facilitates handling of molded articles, and simplifies the processing steps such as automatic molding-automatic removal-automatic stacking.

Further, in the molding method according to the fifth aspect of the present invention, the waste paper material is obtained by crushing or defibrating waste paper such as office waste paper, old corrugated cardboard, or old newspaper. A paper-based foamed material obtained by mixing a foaming agent with the waste paper material. The foamed material is primarily foamed at a predetermined magnification by steam, and then is passed through a non-ripening or aging process for a certain period of time to be granulated into a hopper of a molding machine, and the pores are formed. Is filled into a molding die, and is heated and foamed by a usual method of a heating process using a heating steam in the molding die to form a waste paper foam, which is complicated and has high precision requirements according to demand applications. Molding can be easily performed by changing the mold.Furthermore, the fibers of the used paper are entangled with each other and bonded to the synthetic resin material to form a soft and strong molded product. sex Contributes to the efficiency, the manufacturing cost can be provided a paper foam inexpensive and safe form.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the method for producing a foamed molded article of waste paper according to the present invention, when molding into a foamed molded article utilizing recycled paper, a molding die is filled with a foaming raw material containing waste paper material. Enter the heating process. Entering this heating step, the heating step proceeds, the foaming raw material mixed with the blowing agent expands,
When a surface pressure is applied, the heating process is controlled. That is, in the heating step, the steam pressure (gauge pressure) is 0.5 to 3.0 kg / c.
m ² , heating time 20 to 30 seconds, surface pressure at that time
When the pressure reaches 8 to 1.0 kg / cm ² , the heating is stopped and the molding step is controlled to be shifted to the cooling step, thereby obtaining a molded article. That is, in a conventional method of foam molding, a heating temperature of 110
~ 140 ° C, cage pressure 0.5 ~ 3.0kg / c
m ² , through a heating step for 20 to 30 seconds, and a pressure of 4.0 to 5.0 kg / c at a cooling water temperature of about 40 ° C.
m ² , a cooling step of 20 to 30 seconds is performed, and in the case of vacuum cooling, the pressure in the molding die is 600 to 650 mmHg.
At 60 to 90 seconds, until the mold temperature falls to 60 to 70 ° C. Then, when the temperature of the molding die reaches 60 to 70 ° C., a method of releasing the molded body and taking out the molded body is used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of manufacturing a waste paper foam molded article according to the present invention will be described with reference to the example of FIG. Raw material c in which foamable synthetic resin materials such as expandable polystyrene particles or expandable polyolefin particles or their pre-expanded particles are substantially equivalently supplied from the expandable raw material supply unit 20 and fed by the feeder 4 having a filling machine. Fill it,
After being heated and foamed by a heating process using heating steam a from steam valves 5 and 6 in a steam pipe connected to a steam device 15 and molded into a waste paper foam molded article in a mold, a pipe connected to a water supply device 17 via a water storage tank 16. The molded product is cooled by a cooling process using cooling water b from the inside water supply valves 7 and 8, and the drain b ₂ from the inside of the molding dies 1 and ₂ is drained through the drain valves 9 and 10. A waste paper foaming molding device is constructed which is discharged to the drainage device 14 by piping and is also connected to the vacuum device 13 by piping having the vacuum side valve 12. The mold is released from the mold and taken out.

The foamable raw material c is supplied from the foamable raw material supply section 20 by adjusting the opening degree of the supply valve 22. The foamable raw material c is a waste paper material of 50% by weight or more. Preferably, 50 to 55% by weight, 45 to 50% by weight of an expandable synthetic resin material such as expandable polystyrene particles or expandable polyolefin particles or pre-expanded particles thereof, and 5 to 30% of a blowing agent as necessary.
After mixing with wt%, it can be filled in a molding die. In this case, the foamable raw material c is obtained by pulverizing waste foamable styrene into 50% by weight or more of the waste paper material, preferably 50 to 55% by weight, and reducing the volume by 45%.
~ 50wt% Mixing and heating, 5 ~ 30wt% foaming agent
What mixed and granulated may be used.

In the molding step, a device (not shown) for detecting the surface pressure of the molded article due to foaming in the molding die controls the heating operation in the molding step, stops the cooling step or takes out the molded article. It is preferable to control the process. In addition, when using waste paper raw materials, defibrated waste paper very easily absorbs moisture, and thus it is preferable to pass steam having low moisture, for example, ordinary saturated steam through a heating furnace or the like and use it as dry steam.

Further, in the forming step associated with foaming in the molding die, by using a detecting device in combination for detecting the foaming pressure, the forming steps of heating time, cooling and cooling can be controlled. It is possible to provide a facility that can produce a molded body with a simple configuration and at low cost without adverse effects such as failure such as unfoamed or tertiary foamed.

The waste paper material, which is a paper-based foam material, and the foamed synthetic resin material of the foamed particles or the pre-expanded particles thereof, or a material obtained by grinding and reducing the volume of waste styrofoam and mixing a foaming agent with the foamed agent are substantially used. Equally mixed and used as a foamable raw material, for example, the waste paper material should be 50 wt% or more, preferably 50 to 55 wt%, in order to use it as an industrial waste treatment device, the waste paper must be 50 wt% or more. It should be taken into consideration that if the amount of fiber protruding in the mixed state of the used paper and the synthetic resin is not approved and the amount of the protruding fiber is deteriorated, the foam bonding state is deteriorated. In particular, the foamable raw material is obtained by mixing waste paper material and foamable synthetic resin at a temperature of about 110 to 18;
The mixture is pressurized and softened while being heated to about 0 ° C., and a foaming agent is put into the mixture and the mixture is softened and kneaded to granulate. As an ideal granulation form, the gas escapes from the paper and the foaming agent to the outside. What is necessary is just to wrap the resin in a state where it does not exist, and the thinner the resin film, the easier it is for the foaming raw material granulated at a low temperature to expand and the molding cycle can be shortened. However, the fibers of the waste paper material actually protrude from the surface of the resin. Consideration should be given to the mixing ratio of a foamed synthetic resin material or a material obtained by pulverizing waste foamed polystyrene and reducing the volume.

If the amount of the foaming agent is 5 to 30% by weight, the gas pressure becomes too high above the upper limit, cracks are generated in the granulated film and gas is released, which affects foam molding. However, below the lower limit, the granulated product does not expand due to a small amount of gas at the time of heating, and becomes an unfoamed state without fusion, resulting in molding failure. Further, the waste paper material and the foamed synthetic resin material or the material obtained by crushing and reducing the volume of the waste foamed styrene are mixed and granulated by a mixing device such as a separate mixer, and then put into the foamable raw material supply unit 20. It is preferable to fill the molding dies 1 and 2 by a feeder 4 having a filling machine.

The foamable synthetic resin material includes:
For example, to polystyrene or polyolefin resin particles,
Using beads containing 5 to 10% by weight of a volatile blowing agent such as propane, butane or pentane, hexane and a mixture thereof, and if necessary, 0.05 to 0.3% by weight of a foaming aid with respect to the resin particles. What is used is an expandable polymer particle containing 0.05 to 0.5% by weight of an antiblocking agent. Further, as the foaming agent,
Azodicarbonamide (ADCA) chemical formula C ₂ H ₄ N ₄
O ₂ · H ₂ NOCN = NCONH ₂ (trade name: VINHALL SE # 30 manufactured by Eiwa Chemical Industry Co., Ltd.) is used in an appropriate amount, for example, about 140 to 150 ml / g at 142 ° C.

Further, the molding dies 1, 2 of the molding machine are
A vacuum device 13 to deploy through the vacuum side valve 12 in the molding die as shown in FIG. 1, the vacuum within the forming mold by suction b _1, the filling, to carry out the heating and cooling, the molded article The air and the drain in the mold can be efficiently discharged by exhausting from the side opposite to the steam supply side during heating. Furthermore, at the time of cooling, the use of a vacuum can save cooling water and reduce the water content of the molded product, which is convenient. Incidentally, the piping system path of the drain b ₂ is deployed drainage device 14,
It is preferable to connect to a water supply device 17 via a water storage tank 16 as needed to form a cooling water circulation system.

The foamable raw material is a mixture of a paper-based material obtained by pulverizing or fibrillating waste paper such as office waste paper, used corrugated cardboard, or used newspaper, and a material obtained by pulverizing waste Styrofoam to reduce the volume (mixing ratio). As the waste paper raw material 50 wt
% Or more, preferably 50 to 55 wt%, and a mixture of 45 to 50 wt% of a waste foamed polystyrene obtained by pulverizing and reducing the volume of the waste foamed polystyrene) is mixed with a foaming agent in an ingot while heating the mixture. Then, the foamed raw material of the paper-based foamed material obtained by pulverizing and granulating it or granulating it into a pellet while heating is mixed with a foaming agent in an amount of 5 to 30% by weight in a molding die by an ordinary method. May be heated and foamed.

The waste paper material is obtained by crushing or defibrating waste paper such as office waste paper, old corrugated cardboard, or old newspaper, and is a paper-based foam material obtained by mixing the waste paper material and waste styrofoam with a foaming agent. Then, after the foam is primarily foamed to a predetermined magnification by steam, the mixture is granulated into the foamable resin through an aging process for a non-aged or fixed period of time, and then sent to a molding machine hopper to form a molding metal having small holes. Fill in the mold,
It can also be formed into a waste paper foam by heating and foaming in a molding die by a conventional method of a heating step using heating steam.
In this case, the blending amount of the paper-based foaming material and the foaming resin is preferably selected and mixed according to the required required hardness of the molded product.

[0019]

According to the present invention, a foaming raw material including waste paper material is filled into a molding die having small holes, and heated and foamed in the molding die by a heating process at a reduced pressure and a normal pressure in a usual manner. In the in-mold molding method of forming a molded product by performing cooling in a water-cooling process using cooling water and a cooling process after leaving the molded product into a foamed molded product, the waste paper material and the foamed particles or the pre-expanded particles thereof are foamed. Filling the molding die with a foaming raw material obtained by mixing a foaming raw material obtained by mixing a foaming agent with a foamed synthetic resin material or a material obtained by mixing a foaming agent with waste styrofoam, and the fibers of the waste paper material are entangled with each other. In addition to being able to form a molded product that is soft and strong in strength when combined with a synthetic resin material, the productivity is equivalent to foamable styrene molding, and automatic molding is possible, so productivity is higher than conventional pulp molds , High It can be formed into paper foam quality. Further, the foamable raw material is 50 wt% or more, preferably 50 to 55 wt%, of the waste paper material, and a foamable synthetic resin material of the foamed particles or the pre-expanded particles thereof or a material obtained by grinding and reducing the volume of the waste foamed polystyrene 45 to 50 wt%. %
And a material obtained by mixing 5 to 30% by weight of a foaming agent,
By filling this into a molding die and molding in the mold, it can contribute to the effective use of waste paper, handling of molded products is easy, and processing steps such as automatic molding-automatic removal-automatic stacking etc. The work can be simplified, and the waste paper material is mixed with an expandable synthetic resin material such as expandable polystyrene particles or expandable polyolefin particles, and the mixture is heated and foamed in a molding die by a conventional method, thereby forming a molding process. In addition to being able to easily control the heating operation of the product, it is possible to mold into high-quality waste paper foam by performing in-mold molding with high precision, and it is also possible to effectively reuse waste paper and waste foamable styrene, contributing to waste disposal Can be.

Further, the waste paper material is office waste paper,
It is a paper-based foamed material obtained by pulverizing or fibrillating used paper such as old corrugated cardboard and old newspaper. Since the foaming agent is mixed by mixing the foaming agent in the range of about 5 to 30 wt%, the heating steam is used. Easy foam molding and easy selection of a specified magnification ratio enable weight reduction, and productivity is equivalent to foamable styrene molding, and automatic molding is possible, so productivity is higher than conventional pulp molds. It is economical.

Further, the foamable raw material is a mixture of a paper material obtained by pulverizing or fibrillating waste paper such as office waste paper, old corrugated cardboard, or old newspaper as a waste paper raw material and a material obtained by pulverizing and reducing the volume of waste polystyrene foam. A mixture of a foaming agent when the mixture is heated to form an ingot, a mixture obtained by crushing and granulating the mixture, or a paper-based foamed material mixed with a foaming agent when granulating into a pellet while heating is used. By heating and foaming in a molding die by an ordinary method, a part of the conventional styrofoam molding equipment can be improved to easily produce a highly accurate foamed molded article.

Further, in the present invention, the waste paper material is obtained by crushing or defibrating waste paper such as office waste paper, old corrugated cardboard, or old newspaper, and a foaming raw material obtained by mixing the waste paper material and waste styrofoam with a foaming agent. After this, the foam is primarily foamed to a predetermined magnification by steam, and then passed through a non-ripening or aging process for a certain period of time to be sent to a molding machine hopper and filled in a molding die provided with small holes, and then filled in a molding die. By forming the waste paper foam by heating and foaming in the usual manner of the heating process using heating steam, it is possible to easily form a complicated and highly accurate molded product according to the demand application by changing the mold, A molded product with strong strength can be made, which contributes to shortening of the cycle and efficiency of productivity, and the manufacturing cost is low.
A safe form of waste paper foam can be provided, the maintenance of its manufacturing equipment is also easy, the reliability can be greatly improved, and a safe form of foamable molded article can be manufactured.

[Brief description of the drawings]

FIG. 1 is a system explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

a Heating steam b Cooling water b ₁ Intake b ₂ Drain 1 Mold 2 Mold 3 Cavity 4 Feeder 5 Steam valve 6 Steam valve 7 Water supply valve 8 Water supply valve 9 Drain valve 10 Drain valve 12 Vacuum side valve 13 Vacuum device 14 Drainage device 15 Steam device 16 Water storage tank 17 Water supply device 18 Pin for mold release 20 Foamable material supply section 22 Supply valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 1/09 BSF B29K 105: 04 65/02 105: 26 // B29K 1:00 B65D 1/00 BRKC 25 : 00 BSD 105: 04 BSF 105: 26 A F term (reference) 3E033 BA10 BA14 BA22 BB01 3E086 BA02 BA14 BA16 DA08 4F204 AA01 AA03 AA13 AA50 AB02 EA01 EB01 EB28 EF27 EK13 EK15 EL03 4F301 AA15 BF12 BF12

Claims (5)

[Claims] 1. A foaming raw material is filled in a molding die provided with small holes, and heated and foamed in a heating step by a heating method under reduced pressure and normal pressure in the molding die to form a foamed molded product. Thereafter, in an in-mold molding method in which a molded product is formed by cooling in a cooling step of water cooling using cooling water and natural cooling, the waste paper material is substantially equivalent to the foamed synthetic resin material of the foamed particles or the pre-expanded particles thereof. A method for producing a foamed molded article of waste paper, characterized in that the foaming raw material mixed into the mold is filled in the molding die and molded in the mold. 2. The method according to claim 1, wherein the expandable raw material comprises 50% by weight of waste paper material.
As described above, preferably, the foamable synthetic resin material of the foamed particles or the pre-expanded particles thereof is used in an amount of 45 to 5 wt% based on 50 to 55 wt%.
The method for producing a recycled molded article of waste paper according to claim 1, wherein 0 wt% is mixed, and the foamable raw material is molded in a mold. 3. The foamable raw material is a mixture of a paper-based material obtained by pulverizing or fibrillating waste paper, such as office waste paper, used corrugated cardboard, or used newspaper, and a material obtained by pulverizing waste Styrofoam to reduce its volume. A foaming agent was mixed when the mixture was heated to form an ingot, and the mixture was pulverized and granulated, or a foaming agent was mixed when the mixture was granulated into pellets while heating. The method for producing a foamed molded article of waste paper according to claim 1 or 2, wherein the foamed paper-based material is heated and foamed in a molding die by an ordinary method. 4. The foamable raw material contains 50% by weight of waste paper material.
As described above, preferably, 50 to 55 wt% of the waste foamed polystyrene is pulverized and reduced in volume to 45 to 50 wt%.
3. A used paper foam molding according to claim 1 or 2, wherein the paper foam material is mixed with a foaming agent in an amount of 5 to 30 wt%, and the paper-based foam material is heated and foamed in a molding die by an ordinary method. How to make the body. 5. The waste paper material is obtained by pulverizing or fibrillating waste paper such as office waste paper, old corrugated cardboard, or old newspaper, and is a paper-based foam material obtained by mixing a foaming agent with the waste paper material. After primary foaming to a predetermined magnification by steam,
Waste paper is sent to a molding machine hopper after unripening or aging process for a certain period of time, filled into a forming die provided with small holes, and heated and foamed in a forming die by a heating method using a heating steam in a usual manner. The method for producing a waste paper foam molded article according to claim 3 or 4, wherein the method is formed into a foam.