JP2002003615A - Inner mechanical parts of business equipment obtained by molding of non-crystalline resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the product design of new inner mechanical parts of business equipment corresponding to highly functionalizing of the equipment such as combining by presenting a resin composition and a molding method having an improved productivity for the inner mechanical parts of such as copying machine, printer, facsimile, or the like and combined equipments of these which are required to have the dimensional stability of product, dimensional accuracy of molding product, and a flame retardant property. SOLUTION: The inventive inner mechanical parts of business equipment are obtained by molding a resin composition which is reinforced with at least one of inorganic type and/or organic filler, is flame retarded with a flame retardant of non-halogen type, and has a heat deformation temperature of 125 deg.C or more at loading of 1.82 MPa.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-made internal mechanism part of office equipment such as a copying machine, a printer, a facsimile, etc., which require dimensional stability and productivity of a molded product. More specifically, the present invention relates to internal mechanical parts such as a chassis frame of office equipment, a paper transport unit guide, a roll, and a cover.

[0002]

2. Description of the Related Art With the development of information communication networks, demands for copiers, printers, facsimile machines, and multifunction machines (hereinafter abbreviated as "office equipment") have been rapidly increasing. In order to respond to this demand, the use of resin has been promoted for the purpose of reducing the number of parts of internal mechanism parts made using sheet metal and simplifying the manufacturing process. The resin used for the internal mechanical parts of these office equipment must have the rigidity that the internal mechanical parts can withstand loads, the product dimensions under the use environment are stable for a long time, and the resin molded product It is necessary to have high productivity and high dimensional accuracy. In addition, in recent years, characteristics such as ease of disposal after use of the product and lightening the burden on the environment such as not generating environmentally harmful substances during incineration have been particularly emphasized in recent years.

[0003] On the other hand, office equipment using thermal fixing of toner for a printing mechanism has been developed to have a higher printing speed, higher accuracy, and multifunction. Improvements in the functions of these office equipment have resulted in higher operating temperatures and consolidation of the internal mechanical components, and the amorphous resin used has a longer-term stability of product dimensions in the operating environment than before. Is required at a high level. Here, the required long-term stability of a product dimension means a dimensional change in a state where an actual load is applied in a product transportation and use environment. In order to prevent the printing accuracy of office equipment and troubles during paper transport, internal parts of office equipment made of materials with small dimensional changes are required.

The dimensional accuracy of a molded product is a finished value with respect to a design value of the molded product, and often depends on molding conditions and resin properties of the molded product. Factor. On the other hand, an amorphous resin used for an internal mechanism component of office equipment that performs thermal transfer using toner has a heat deformation temperature of 12 at a load of 1.82 MPa.
Those having a temperature of 0 ° C. are often used. With an amorphous resin having a heat distortion temperature of 120 ° C., it is difficult to cope with higher functionality of office equipment, and this is an obstacle to new product design.

However, in order to cope with use in a high temperature environment, it is necessary to increase the heat resistance of the amorphous resin used. In general, the amorphous resin has a decrease in fluidity with an improvement in heat resistance. The decrease in fluidity causes a reduction in dimensional accuracy required for internal parts of office equipment and a decrease in productivity in injection molding. In addition, the flame-retardant properties required for each component used in office equipment are required because many office equipment have a power supply unit and a heat-generating unit inside. In many parts, required characteristics are satisfied by adding a flame retardant to a resin used.

As the flame retardant added to the resin, a resin using a halogen-based flame retardant is not preferred from the viewpoint of load on the environment after use, and it is desired that the resin be a non-halogen-based flame retardant. This is because there is a risk of generating an environmentally hazardous substance when incinerating a resin containing a halogen-based flame retardant. On the other hand, when manufacturing internal mechanism parts of office equipment using resin, many are manufactured by injection molding. In injection molding, injection pressure changes in proportion to the melt viscosity of the resin used, and high melt viscosity resins require high pressure when filling the resin. Can be difficult.

As an injection molding method for improving the dimensional accuracy of a product, there are a method of lowering the melt viscosity of the resin by increasing the resin temperature setting during the injection molding, and a method of extending the cooling time in the mold. It has been implemented. Since the resin melt viscosity can be reduced by increasing the resin temperature setting, the pressure can be sufficiently transmitted to the end of the flow, but the volume shrinkage of the resin itself during cooling and solidification increases. , Which causes sink marks, voids and the like. In addition, increasing the resin temperature requires time for cooling the resin. If the cooling is not sufficient, the temperature of the molded product at the time of removal is high. For this reason, after the molded article is removed from the mold, there is a possibility that the molded article itself may undergo volume shrinkage or deformation due to its own weight before the temperature of the molded article itself gradually decreases to the ambient temperature. This is a factor that deteriorates the dimensional accuracy and is not preferable.

[0008] In the method of extending the cooling time in the mold, cooling distortion accompanying the volume change generated during cooling often remains in the molded product, and the dimensional stability in the use environment of the product deteriorates. And reduce productivity. Generally, an amorphous resin has a higher melt viscosity than a crystalline resin. For this reason, the load on the molding machine is large, and it is difficult to integrate and integrate the internal mechanical components of the office equipment. In order to enable the integration of parts corresponding to the compounding of office equipment, the load on the molding machine was reduced by the molding method or the resin composition with reduced melt viscosity, and the internal mechanical parts of office equipment were integrated.
There is a need for technology that facilitates integration.

At present, many of the internal mechanical components of office equipment are
It is made of a reinforced polyethylene terephthalate (hereinafter abbreviated as “PET”) resin. By adding a reinforcing filler such as glass fiber to crystalline resin, it is possible to obtain a heat distortion temperature almost equal to the melting point. Therefore, it is difficult to obtain the required creep characteristics, and it is not easy to obtain the dimensional stability under the use environment required for the internal mechanical parts of the office equipment.

On the other hand, new molding methods such as high-speed injection molding and gas assist molding have been proposed as methods for manufacturing internal mechanical parts of office equipment requiring dimensional accuracy and dimensional stability. The high-speed injection molding method has the effect of preventing the rise in melt viscosity due to cooling from the mold, reducing the melt viscosity with high shearing force, and reducing the difference in pressure distribution by injecting the amorphous resin at high speed. . In addition, the effect of reducing the injection time is obtained, and the productivity is improved. However, the high-speed injection may cause the generation of burrs and the risk of resin burn due to adiabatic compression in the gas reservoir at the end of the mold cavity.

In the gas assist molding method, a hollow portion is formed inside a molded article by injecting a compressed gas into the resin, and the compressed gas has a dwelling effect from the inside of the molded article to prevent resin sink. It is especially effective. In addition, in the gas assist molding method, it is not necessary to apply an excessive holding pressure to the molded product, so that molding distortion hardly remains, which is effective in improving dimensional accuracy and suppressing warpage. When the location is limited by the shape of the molded product, the effect may not be sufficiently exhibited.

Regardless of the injection molding conditions, as a resin modifying means for lowering the melt viscosity of the amorphous resin, techniques such as lowering the molecular weight of the resin and adding a plasticizing component to the resin are used. However, a decrease in the molecular weight of the resin greatly affects the mechanical strength and chemical resistance, and the addition of the plasticizing component may cause problems such as adhesion of the plasticizer component to the mold surface during molding. On the other hand, J.I. Appl. Polym. Sci. , Vo
l. 30, 2633 (1985), it is known that when carbon dioxide is absorbed by a resin, it acts as a plasticizer for the resin and lowers the glass transition temperature. It has not been widely applied to processing.

JP-A-5-318541 discloses that a resin such as carbon dioxide or nitrogen is contained in a thermoplastic resin, and the resin is filled into the cavity while removing the gas in the cavity. To improve the fluidity of the molded article and obtain a molded article without deterioration in strength or appearance.
However, in this method, when carbon dioxide is used as the gas, the amount of the gas contained in the resin is small at a maximum of about 0.18% by weight, and it is difficult to obtain a sufficient fluidity improving effect. It can be said that it is difficult to obtain accuracy and dimensional stability.

[0014] WO 98/52734 discloses that
In injection molding of thermoplastic resin,
A method is disclosed in which a molten resin whose viscosity has been reduced by dissolving it by weight or more is pressurized in advance with a gas at a pressure higher than a pressure at which foaming does not occur at the flow front of the molten resin, and injected into the mold cavity. ing. However, in this method, the filling of the resin is inhibited by the pressurized gas in the cavity, so that the pressure at the time of filling increases, which is disadvantageous for obtaining high dimensional accuracy and dimensional stability. In addition, a seal structure for maintaining the pressure of the pressurized gas filled in the cavity is required, and it is not easy to create a mold for manufacturing internal mechanism parts of office equipment having a complicated shape. Absent.

[0015]

SUMMARY OF THE INVENTION The present invention improves the functions of internal mechanism parts of office equipment, such as copiers, printers, and facsimile machines, which require dimensional stability of products, dimensional accuracy of molded products, and flame retardancy. It is another object of the present invention to provide an amorphous resin composition for coping with the new product design. Specifically, we have improved the high-temperature creep characteristics, which are indicators of the long-term stability of the dimensions required for internal mechanical components of office equipment manufactured from amorphous resin, It is an object to improve the dimensional change of a molded product which depends on the molding conditions and resin properties of the molded product, while improving the dimensional change under a load state.

[0016]

Means for Solving the Problems The present inventors have found that the long-term stability of products required for internal mechanical parts of office equipment is 70%.
The high-temperature creep characteristics were examined by paying attention to the fact that judgment was made based on the amount of creep deformation after 4 hours in a state where a 0.25% strain load was applied in an atmosphere of ° C. As a result, the amorphous resin composition reinforced with at least one type of inorganic or / and organic filler and having a heat distortion temperature of 125 ° C. or more is subjected to a 0.25% strain load in a 70 ° C. atmosphere. Was found to have good creep deformation after 4 hours.

That is, according to the present invention, the amorphous resin composition is reinforced by at least one kind of inorganic or / and organic filler, is flame-retarded by a non-halogen flame retardant, and The heat distortion temperature under a load of .82 MPa is 125
The present invention relates to office equipment internal mechanical parts obtained by molding a material having a temperature of at least ℃.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. In the present invention, the office equipment means a copier, a printer, a facsimile, and the like, and a multifunction peripheral having a plurality of these functions. In the present invention, the internal mechanical components of the office equipment mean a chassis frame, a paper transport unit guide, a roll, and the like.

The amorphous resin composition used in the present invention comprises:
It is preferable that the non-crystalline resin composition has a small molding shrinkage and a small dimensional change due to post-shrinkage after molding. Specifically, polystyrene resin (hereinafter abbreviated as “PS resin”), modified polyphenylene ether resin (hereinafter “mP
Abbreviated as “PE resin”), acrylonitrile / butadiene / styrene copolymer (hereinafter abbreviated as “ABS resin”),
Polycarbonate (hereinafter abbreviated as “PC resin”), PC
Non-crystalline resins such as resin-based / ABS-based resins are preferred. Further, mPPE resin containing a polyphenylene ether component is a point that it is easy to add a typical phosphoric ester flame retardant or a silicon flame retardant as a non-halogen flame retardant and to easily obtain a material having a high heat distortion temperature. Is preferred.

The inorganic or organic filler used in the present invention includes glass fiber, carbon fiber, metal fiber, aramid fiber, potassium titanate, asbestos, silicon carbide, ceramic, silicon nitride, barium sulfate, calcium sulfate, Kaolin, clay, pyrophyllite, bentonite, sericite, zeolite, mica, mica, nephelinenite, talc, atalpargite, wollastonite, slag fiber, ferrite, silicon, calcium, calcium carbonate, magnesium carbonate, dolomite,
Zinc oxide, gypsum, glass beads, glass powder, glass balloon, quartz, quartz glass, alumina and the like can be used arbitrarily.

The shape of these fillers is not particularly limited, and may be arbitrarily selected from fibrous, plate-like and spherical shapes. In addition, these inorganic or organic fillers,
It is also possible to use two or more kinds in combination. Further, if necessary, it can be used after being pre-treated with a coupling agent such as a silane-based or titanium-based coupling agent.

The amorphous resin composition used in the present invention is characterized in that an inorganic or organic filler is added, but the amount of the filler is not limited. However, in order to satisfy the effects of improving the rigidity of the amorphous resin composition, securing dimensional accuracy, and suppressing deformation such as warpage, the amount of the filler must be 5% by weight or more. Is preferable, and the addition amount is more preferably 10% by weight or more. When the amount of the inorganic or organic filler is less than 5% by weight, the rigidity is improved,
This is not preferable because the effect of improving the dimensional accuracy is small.

Here, the added amount of the filler means a ratio when the total amount of the amorphous resin composition is 100% by weight, and when two or more fillers are used, the total added amount. It is. The amorphous resin composition of the present invention is characterized in that it is flame retarded by a non-halogen flame retardant. this is,
This is because halogen-based flame retardants conventionally used contain chlorine, bromine, and the like, and thus may generate environmentally harmful substances when incinerated at the time of disposal. On the other hand, it has not been confirmed that environmentally hazardous substances are generated when non-halogenated flame retardants are incinerated.

The non-halogen-based flame retardant is not particularly limited, but a phosphorus-based flame retardant, a silicon-based flame retardant and the like can be considered, and a flame-retardant auxiliary can be used together if necessary. In the amorphous resin composition of the present invention, additives usually used, for example, an antioxidant, a mold release agent, a lubricant, a heat stabilizer, a light fastness stabilizer, a coloring agent, an antibacterial agent and the like as required. One or more can be added.

In the present invention, the measurement of the heat distortion temperature under a load of 1.82 MPa was carried out and measured in accordance with ASTM test method D648. The test specimen is 1/4 inch wide (approximately 6.4 inches).
mm), height 1/2 inch (about 12.5 mm), length 5
An inch (about 125.7 mm) piece of tongue was used. In the present invention, the amorphous resin composition has 1.82 MPa
The heat deformation temperature under load is 125 ° C. or more. If the heat distortion temperature is lower than 125 ° C., the long-term stability of the dimensions in the use environment of the internal mechanical components of the office equipment cannot be satisfied, which is not preferable.

In the present invention, the internal mechanical parts of the office equipment are molded from an amorphous resin composition having a heat deformation temperature of 125 ° C. or more under a load of 1.82 MPa. Certain amorphous resin compositions generally tend to have a high viscosity when melted. For this reason, the resin pressure at the time of filling the resin may increase depending on the desired shape and the mold structure. Furthermore, in addition to the cause of molding failure such as insufficient filling, since filling is performed at a high pressure, a molded product is likely to have internal strain remaining, and as a result, deformation such as warpage is likely to occur after molding.

In the present invention, 0.2% by weight or more of carbon dioxide is dissolved or absorbed in the amorphous resin composition,
By improving the fluidity, it is possible to suppress an increase in resin pressure during filling into a mold cavity and to mold an internal mechanism component of an office machine having a complicated shape. In the amorphous resin composition of the present invention, if necessary, 0.2% by weight or more of carbon dioxide is dissolved or absorbed in the amorphous resin composition, and injection molding is performed. %, It is difficult to obtain a sufficient effect of improving the fluidity, and it is difficult to obtain sufficient dimensional accuracy and dimensional stability as compared with the conventional injection molding method.

In the present invention, the amorphous resin composition has a content of 0.1%.
As a method for dissolving or absorbing 2% by weight or more of carbon dioxide, a method in a heating cylinder of an injection molding machine, a nozzle portion of a molding machine,
In addition to a method of mixing carbon dioxide with the amorphous resin in the molten state by providing a facility for supplying carbon dioxide at any position between the mold and the nozzle portion of the molding machine, the non-melting state of the non-crystalline resin A method in which a resin pellet is granulated in a state in which carbon dioxide is mixed with a crystalline resin and injection molding is performed using the same, a method in which carbon dioxide is previously absorbed in the resin pellet in a closed container, and the like can be mentioned.

The carbon dioxide is easily dispersed uniformly in the amorphous resin composition, the adjustment of the amount of dissolution or absorption is easy, the complexity in setting up before molding is small, and the Considering that there is no need to provide a sealed, pressure-resistant structure, it is necessary to supply carbon dioxide to the heating cylinder of the injection molding machine, the nozzle of the molding machine, or any position between the mold and the nozzle of the molding machine. It is preferable to provide a facility and mix carbon dioxide with the amorphous resin in a molten state.

In the present invention, the amount of carbon dioxide dissolved or absorbed is measured by the following method. Immediately after the molding, the weight of the molded article is measured (M1). The molded product is left in a hot-air dryer kept at 100 ° C. for 48 hours or more to emit carbon dioxide. The weight of the molded product taken out of the hot air dryer is measured (M2). The amount of carbon dioxide absorbed or dissolved (% by weight) is calculated as (M1-
M2) Calculated from ÷ M2 × 100.

In the present invention, after dissolving or absorbing carbon dioxide in the amorphous resin composition, it is injected into the mold cavity which is substantially at atmospheric pressure without pressurizing the inside of the mold cavity in advance. Is preferred. This is because the filling of the resin is inhibited by the pressurized gas in the cavity, and the pressure at the time of filling increases, which is disadvantageous for obtaining high dimensional accuracy and long-term stability of the dimensions. Also,
To create a mold for molding internal mechanical components of office equipment, which often require complex structures that require a seal structure to maintain the pressure of the pressurized gas filled in the cavity. Is difficult.

The internal mechanical components of the office equipment according to the present invention include copiers, printers, facsimile machines, etc., which require dimensional stability of products, dimensional accuracy of molded products, and flame-retardant properties. While maintaining and improving the productivity of mechanical parts, it is possible to provide resin parts that support new product designs. Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples.

The resin used in the injection molding was mPPE resin "Zylon X1915 manufactured by Asahi Kasei Kogyo Co., Ltd."
1916 "," Xylon X702V "," Xylon X1
735 ”,“ Xylon 640V ”,“ X171 ”
1 ", mPPE resin composition A, B, C, PC resin / ABS resin" Multilon RN3 manufactured by Teijin Chemicals Ltd. "
135 ", a PC resin" Panlite G3430H manufactured by Teijin Chemicals Ltd. ", and a PET resin" Hyperlite 8300SE manufactured by Kanegafuchi Chemical Industry Co., Ltd. " Tables 1 and 2 show the amount of filler added for each resin, the type of flame retardant, and the thermal deformation temperature under a load of 1.82 MPa.

Here, "Zylon X1915" and "Xylon X1916" manufactured by Asahi Kasei Kogyo Co., Ltd. are mPPE resins to which 30% by weight of an inorganic additive (glass flake) and a phosphoric ester-based flame retardant are added. . "Same X702
"V" is an mPPE resin to which 20% by weight of an inorganic additive (glass fiber) and a phosphate ester-based flame retardant are added.
“X1735” is an mPPE resin to which 35% by weight of an inorganic additive (glass fiber, mica) and a phosphoric ester-based flame retardant have been added. "640V" has a phosphate ester flame retardant added, but no inorganic additive. “X1711” is an mPPE resin to which 40% by weight of an inorganic additive (glass flake) and a phosphoric ester-based flame retardant are added.

"Zylon X1735" is an amorphous resin which is currently used for internal mechanical parts of office equipment, and is used as an index of the moldability and high temperature creep characteristics of the amorphous resin composition of the present invention. . The mPPE resin composition A is an mPPE resin composed of 68% by weight of a PPE resin, 8% by weight of a PS-based resin, 4% by weight of a phosphate ester-based flame retardant, and 20% by weight of an inorganic additive (glass flake). B is an mPPE resin composed of 50% by weight of a PPE resin, 8% by weight of a PS-based resin, 7% by weight of a phosphate ester-based flame retardant, and 35% by weight of an inorganic additive (mica), and C is a PPE resin. It is an mPPE resin composed of 70% by weight, 10% by weight of a PS-based resin, 10% by weight of a phosphate ester-based flame retardant, and 10% by weight of an inorganic additive (glass fiber).

"Multilon RN31 manufactured by Teijin Chemicals Ltd."
35 "is 35% by weight of an inorganic additive (glass fiber),
PC resin / ABS with phosphate ester flame retardant added
It is a system resin. "Panelight G34 manufactured by Teijin Chemicals Ltd."
30H "is 30% by weight of inorganic additive (glass fiber)
And a PC resin to which a bromine-based flame retardant has been added. “Hyperlight 8300SE manufactured by Kanegafuchi Chemical Industry Co., Ltd.” is a PET resin to which 30% by weight of an inorganic additive and a brominated flame retardant are added.

For the high-temperature creep test, an ASTM tank-type test piece having a thickness of 3.13 mm, a length of 125.7 mm and a width of 12.5 mm shown in FIG. 1 was used. The mold for obtaining the ASTM tank type test piece has a thickness of 1 at the flow end.
A tab of mm × length 5 mm × width 10 mm was provided. The molding machine is "TR50S2A" manufactured by Sodick Platec Co., Ltd.
Using a molding machine, set the standard resin temperature for each resin to AS
A TM tank test piece was obtained by injection molding.

In order to obtain a test piece having a uniform pressure situation,
The weighing value and the holding pressure switching position were set when the mold cavity product part was almost filled and the tab at the end of the flow was missing. The pressure at the time of filling was the maximum pressure at the time of filling at an injection speed of 15 mm / sec between the measured value and the holding pressure switching value. The holding pressure was set as 70% of the pressure value at the time of filling. The pressure holding time was 7 seconds, and the cooling time was 20 seconds. In the high-temperature creep test, “Heat deformation temperature TESTER-G” manufactured by Toyo Seiki Co., Ltd. was used as a 70 ° C. constant temperature bath. After setting the test piece in the holder for thermal deformation temperature test at 50 mm intervals, it was held for 5 minutes without load. Thereafter, a 0.25% strain load was applied, and the displacement after 4 hours was measured.

The mold for evaluating moldability and dimensional accuracy is provided with four bosses on a square flat plate shown in FIG. 2, and a tab of 1 mm thick × 5 mm long × 10 mm wide is engraved at the end of the flow. "SG125-HP" manufactured by Sumitomo Heavy Industries, Ltd. was used using a mold having a certain shape (hereinafter, a mold with a boss). In order to obtain a test piece having a uniform pressure state, a weighing value and a holding pressure switching position in a state where the product part of the mold cavity was almost filled and the tab at the end of the flow was missing were set.
The pressure during filling is 1 between the measured value and the holding pressure switching value.
The maximum pressure when filling at an injection speed of 5 mm / sec. The holding pressure was set as 70% of the pressure value at the time of filling. The pressure holding time was 7 seconds, and the cooling time was 20 seconds.

The dimensional accuracy of the molded product is determined by measuring the surface of the flat molded product with bosses shown in FIG. 2 on which the boss is not installed by using a three-dimensional measuring device (AE122, manufactured by Mitutoyo) and a measurement program (Geopak400, manufactured by Mitutoyo) ) Was measured according to a multipoint flatness measurement method. Note that both the TR50S2A molding machine and the SG125-HP injection molding machine were provided with equipment for supplying carbon dioxide in the heating cylinder, and adopted a method of mixing carbon dioxide with the amorphous resin in a molten state.

[0041]

Examples 1 to 6 Zylon X1915, X1916, G
702V, mPPE resin compositions A, B, and C were injection molded at their respective standard resin temperatures to make ASTM tank specimens. Using this test piece, a high-temperature creep test under a 70 ° C. atmosphere and a 0.25% strain load was performed, and the amount of creep deformation after 4 hours was measured. Table 1 shows the resin temperature during molding of each resin and the amount of deformation after the high-temperature creep test described above.

[0042]

[Table 1]

[0043]

Comparative Examples 1 to 6 Zylon X1735, 640 V, X1711, Multilon RN3135, Panlite G3
430H and Hyperlight 8300SE were injection molded at their respective standard resin temperatures to make ASTM tanzaku test pieces. Similarly to Examples 1 to 6, using this test piece, a high-temperature creep test under a 70 ° C. atmosphere and a 0.25% strain load was performed, and the amount of creep deformation after 4 hours was measured. Table 2 shows the resin temperature during molding of each resin and the amount of deformation after the high temperature creep test described above.

[0044]

[Table 2]

[0045]

Examples 7 to 10 The mPPE resin composition A was placed at the center of a heating cylinder of an SG125-HP molding machine so that the carbon dioxide absorption was 0.3 to 1.5% by mass at a standard resin temperature. After dissolving carbon dioxide gas in the molten resin in the heating cylinder from the provided gas injection section, the molded article was injection molded into a mold cavity to obtain a flat molded article with a boss having the shape shown in FIG. Table 3 shows the amount of carbon dioxide absorbed by each molded product, the pressure during filling, and the flatness of the molded product.

[0046]

Comparative Example 7 A flat molded article with a boss having the shape shown in FIG. 2 was prepared from mPPE resin composition A by standard injection molding at a standard resin temperature without dissolving carbon dioxide gas in the resin. The degree was measured. Table 3 shows the pressure during filling and the flatness of the molded product.

[0047]

Comparative Example 8 mPPE resin composition A was prepared at a standard resin temperature at a carbon dioxide gas absorption of 0.18% by weight in the resin.
In a state where carbon dioxide gas is dissolved in the molten resin in the heating cylinder from a gas injection part provided at the center of the heating cylinder of the SG125-HP molding machine, a bossed flat plate having the shape shown in FIG. A molded product was prepared, and the flatness was measured. Table 3 shows the amount of carbon dioxide absorbed by the molded product, the pressure during filling, and the flatness of the molded product.

[0048]

[Table 3]

[0049]

The internal mechanical parts of office equipment according to the present invention are used as internal mechanical parts of office equipment such as copiers, printers and facsimile machines which require dimensional stability of products, dimensional accuracy of molded products and flame retardancy. By presenting a resin composition and a molding method that maintain and improve productivity, it is possible to design a product of a new internal mechanism component of office equipment corresponding to high functionality such as compounding.

[Brief description of the drawings]

FIG. 1 shows an ASTM protein test piece of the present invention.

FIG. 2 shows a flat plate with a boss of the present invention.

[Explanation of symbols]

 1. 1. ASTM tanzaku test piece Tab 3. 3. 100mm square plate with boss boss

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Claims (4)

[Claims] 1. An amorphous resin composition which is reinforced by at least one kind of inorganic or / and organic filler, is made flame-retardant by a non-halogen flame retardant,
An internal mechanical component of office equipment, which is obtained by molding a material having a heat deformation temperature of 125 ° C. or more under a load of 1.82 MPa. 2. The amorphous resin composition is obtained by dissolving or absorbing 0.2% by weight or more of carbon dioxide in the amorphous resin composition, and then molding it in a mold cavity. The internal mechanical component of office equipment according to claim 1, characterized in that: 3. The internal mechanical component of office equipment according to claim 1, wherein the amorphous resin composition contains a modified polyphenylene ether-based resin containing a polyphenylene ether component. 4. The office machine according to claim 1, wherein the internal mechanical component of the office equipment is at least one selected from the group consisting of a chassis frame, a paper transport guide, a roll, and a cover. Internal mechanical parts of office equipment described in any of the above.