JP2002069207A - Inner mechanism part for office machine obtained by molding amorphous resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an inner mechanism parts for office machine to correspond with high functionalization by introducing a resin composition with maintained producibility and improved quality, and a method for molding the same, for use in the office machines such as copiers, printers, and facsimile machines requiring dimensional stability for end products, dimensional accuracy for molded products, and fire retardancy. SOLUTION: The internal mechanism parts for office machine are obtained by molding a resin composition which has been rendered fire-retardant by using a non-halogen fire-retarding material and has a thermal deformation temperature of not less than 135 deg.C under a 1.82 MPa load.

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 components of these office equipment must have stable product dimensions in the operating environment for a long period of time, and must have high productivity and high dimensional accuracy as resin molded products. It is. 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] In particular, office equipment that uses 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, the 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, the internal mechanical parts of some 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, a heat distortion temperature almost equal to the melting point can be obtained.However, in a temperature environment beyond the glass transition point, crystalline resin can be loaded by a load. 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, although the effect of reducing the injection time and the productivity are improved, the high-speed injection may cause burrs and 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 copiers, printers, facsimile machines, etc., which require dimensional stability of products, dimensional accuracy of molded products, and flame retardancy, and the functions of these multifunction machines. 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 having a heat deformation temperature under a load of 1.82 MPa of 135 ° C. or more was obtained in a 70 ° C. atmosphere at 0.2 ° C.
It was found that the amount of creep deformation after 4 hours under a 5% strain load was good. That is, in the present invention, the amorphous resin composition has a heat deformation temperature of 135 ° C. under a load of 1.82 MPa.
The present invention relates to an internal part for office equipment obtained by molding the above.

[0017]

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 molding shrinkage is small and the dimensional change due to post-shrinkage after molding is small. Specifically, polystyrene (hereinafter abbreviated as “PS”) resin, acrylonitrile / butadiene / styrene copolymer (hereinafter abbreviated as “ABS”) resin, polycarbonate (hereinafter abbreviated as “PC”) resin,
A modified polyphenylene ether (hereinafter abbreviated as “mPPE”) resin is preferred. Also, an alloy of two or more different amorphous resin compositions, such as an alloy of a PC resin and an ABS resin (hereinafter abbreviated as “PC / ABS resin”), an amorphous resin composition and a crystalline resin It may be an alloy with the composition.

The amorphous resin composition used in the present invention comprises:
When the flame retardancy required for the internal mechanical parts of the office equipment is not satisfied, the flame retardancy can be achieved by appropriately adding a selected flame retardant. In making the amorphous resin composition of the present invention flame-retardant, it is preferable that the composition is made flame-retardant by a non-halogen flame retardant. This is because conventionally used halogen-based flame retardants contain chlorine, bromine, and the like, and when incinerated at the time of disposal, may generate environmentally harmful substances. On the other hand, it has not been confirmed that environmentally hazardous substances are generated when non-halogenated flame retardants are incinerated.

As the non-halogen flame retardant, phosphorus, phosphate ester flame retardant, silicon flame retardant and the like are preferable, and it is preferable to use a flame retardant auxiliary as needed. The amorphous resin composition used in the present invention is an mPPE resin containing a polyphenylene ether component, considering that it is easy to add a non-halogen flame retardant and to easily obtain a material having a high heat distortion temperature. Is preferred. When it is necessary to adjust the specific gravity of the amorphous resin composition used in the present invention, an inorganic or organic filler can be added as a specific gravity imparting agent. Specifically, inorganic salts such as barium sulfate, red iron oxide, and tungsten powder;
Oxides, metal powders and the like can be optionally added.

When it is necessary to improve the strength and rigidity of the amorphous resin composition used in the present invention, glass fiber, carbon fiber, metal fiber, aramid fiber, potassium titanate, Asbestos, silicon carbide,
Ceramic, silicon nitride, calcium sulfate, kaolin,
Clay, pyrophyllite, bentonite, sericite, zeolite, mica, mica, nepheline sinite,
Inorganic or organic fillers such as talc, wollastonite, atalpargite, slag fiber, silicon, ferrite, glass beads, glass powder, glass balloon, quartz and quartz glass can be optionally added.

The shape of these inorganic or organic fillers is not limited, and fibrous, plate-like, spherical and the like can be arbitrarily selected. In addition, these inorganic or organic fillers may contain a specific gravity imparting agent and / or a strength imparting agent.
It is also possible to use more than one kind 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 amount of the inorganic or organic filler to be added to the amorphous resin composition of the present invention is not limited, but the rigidity is improved, dimensional accuracy is secured, or deformation such as warpage is reduced. In order to obtain effects such as suppression, the addition amount is preferably 5% by weight or more, and more preferably 10% by weight or more. When the amount is less than 5% by weight, the effect of adding the above-mentioned filler 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,
When two or more fillers are used, the total amount of the fillers is referred to. The amorphous resin composition of the present invention can be added with an elastomer component for the purpose of improving impact resistance, and additives usually used in thermoplastic resin compositions, such as antioxidants One or more of a releasing agent, a lubricant, a heat stabilizer, a light-fast stabilizer, a coloring agent, an antibacterial agent and the like can be added as required.

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) ASTM type tank test piece was used. In the present invention, the amorphous resin composition comprises:
The heat deformation temperature under a load of 1.82 MPa is 135 ° C. or more. If the heat distortion temperature is lower than 135 ° 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 135 ° 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, depending on the target shape and the mold structure, there is a possibility that the resin pressure at the time of filling the resin increases. 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.

If the amorphous resin composition of the present invention is difficult to fill into a mold cavity due to its high viscosity at the time of melting, it may be added to the amorphous resin composition as necessary. After 0.2% by weight or more of carbon dioxide is dissolved or absorbed, injection molding can be performed. This is because, by dissolving or absorbing 0.2% by weight or more of carbon dioxide in the amorphous resin composition, the flowability is improved, so that the filling pressure during filling into the mold cavity is suppressed, This is because it becomes possible to mold internal mechanical components of office equipment having a complicated shape.

When dissolving or absorbing carbon dioxide in the amorphous resin composition, the dissolved or absorbed amount is 0.2%.
If the content is less than 10% by weight, it is difficult to obtain a sufficient effect of improving the fluidity, and it is almost equal to obtain sufficient dimensional accuracy and dimensional stability as compared with the conventional injection molding method. Is hard to say. In the present invention, as a method for dissolving or absorbing 0.2% by weight or more of carbon dioxide in the amorphous resin composition, the following methods are used: a heating cylinder of an injection molding machine, a nozzle of a molding machine, a mold and a nozzle of a molding machine. In addition to the 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 above, carbon dioxide is added to the amorphous resin in the molten state in advance. Examples thereof include a method of granulating resin pellets in a mixed state and performing injection molding using the granules, and a method of previously absorbing carbon dioxide into the resin pellets in a closed container.

That carbon dioxide is easily dispersed uniformly in the amorphous resin composition, that it can be dissolved or absorbed in the amorphous resin in a short time, and that the amount of dissolution or absorption can be easily adjusted; Considering that the complexity in the setup before molding is small, and that there is no need to seal the molding machine hopper and to have a pressure-resistant structure, the inside of the heating cylinder of the injection molding machine,
Provide equipment for supplying carbon dioxide to the nozzle part of the molding machine, any position between the mold and the nozzle part of the molding machine,
A method of mixing carbon dioxide with the amorphous resin in a molten state is preferable.

In the present invention, the amount of dissolved or absorbed carbon dioxide 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, the carbon dioxide is injected into a mold cavity at substantially 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.

In the present invention, the internal mechanical parts of the office equipment preferably have a foamed portion inside. The foamed part is filled with carbon dioxide dissolved or absorbed in the amorphous resin composition in a molten state before being filled into the mold cavity together with the amorphous resin composition, As the amorphous resin composition cools and solidifies and shrinks in volume, the pressure of the amorphous resin composition decreases, and the carbon dioxide forms fine bubbles inside the amorphous resin composition. It is supposed to have gradually expanded.

In a conventional injection-molded article, sink marks on the surface of the molded article were generated due to volume shrinkage of the amorphous resin composition. However, the foamed portion of the molded article in the present invention is hardened by the solidification of the amorphous resin composition. In doing so, it is thought that the occurrence of sink marks on the surface of the molded article is suppressed by selectively forming the amorphous resin composition in the slow-moving portion to compensate for the volume shrinkage of the amorphous resin composition from inside the molded article. It is. Further, when the internal mechanical parts of the office equipment in the present invention has a foamed part inside,
It is preferable to have a non-foamed layer having a thickness of 500 μm or more on the surface layer of the molded article. This is because the thickness of the non-foamed layer is 5
If the thickness is less than 00 μm, the surface of the molded product may be swollen, and the mechanical strength may be lowered.

The thickness of the non-foamed layer can be adjusted by the holding pressure and the holding time. The higher the holding pressure and the longer the holding time, the thicker the non-foamed layer tends to be. However, if the holding pressure is too high or the holding time is too long, no foamed portion is formed inside the molded product, and there is a possibility that sinks may occur on the surface of the molded product. Here, the foamed portion refers to a void due to foaming or a portion where a whitening phenomenon is observed when the cross section of the molded product is magnified and observed 10 to 20 times by an optical microscope or the like. The non-foamed layer is a void due to foaming. Alternatively, it indicates a portion where the whitening phenomenon is not confirmed.

The internal mechanical parts 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, and internal components used in these multifunction machines. 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 for the injection molding was mPPE resin "Zylon X9102", "X9108", "X1735", "640", manufactured by Asahi Kasei Corporation.
V "," 740Z ", PC resin" Teijin Chemicals Co., Ltd. "
Panlite LV2225, manufactured by Sumitomo Dow Co., Ltd., and Caliber PCX1775, manufactured by Sumitomo Dow Co., Ltd., and PET resin, Hyperlight 8300SE, manufactured by Kanegabuchi Chemical Industry Co., Ltd. Filler amount of each resin, type of flame retardant, 1.82
Table 1 shows the heat deformation temperature under a load of MPa.

Here, "Xylon X9102", "X9108", "640V" manufactured by Asahi Kasei Kogyo Co., Ltd.
"740Z" is an mPPE resin to which a phosphate ester-based flame retardant is added and which does not contain an inorganic additive. "X1735" is an inorganic additive (glass fiber,
MPPE resin containing 35% by weight of mica) and a phosphoric ester-based flame retardant. In addition, "Xylon X17
35 "is an amorphous resin composition currently used for internal mechanical parts of office equipment, and was used as an index of the moldability and high temperature creep characteristics of the amorphous resin composition in the present invention.

"Panelight LV2 manufactured by Teijin Chemicals Ltd."
225 "is a PC resin containing no flame retardant and no inorganic additive. "Calibur PCX17 manufactured by Sumitomo Dow Co., Ltd."
75 "is a PC-based resin to which a silicon-based flame retardant is added and which does not include an inorganic filler. "Hyperlight 8300SE manufactured by Kanegabuchi Chemical Industry Co., Ltd." uses three inorganic additives.
It is a PET resin to which 0% by weight 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 × length 125.7 mm × width 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 “TR50S2” manufactured by Sodick Plustech Co., Ltd.
Using an "A" molding machine, ASTM tank test pieces were obtained by injection molding at standard resin temperature settings for each resin.

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 the moldability and dimensional accuracy is provided with four bosses on a square flat plate shown in FIG. 2, and a tab having a thickness of 1 mm × length 5 mm × width 10 mm 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 with 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.

[0042]

Examples 1 to 5 Xylon X9108, X9102, 7
40Z, Panlite LV2225, and Caliber PC
X1775 was injection molded at each standard resin temperature to make ASTM tanzaku test 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.

[0043]

Comparative Examples 1 to 3 Zylon X1735, 640 V, and Hyperlite 8300SE were injection molded at standard resin temperatures to prepare ASTM tank test pieces. This test piece was used at 70 ° C. in the same manner as in Examples 1 to 4.
Under an atmosphere, a high-temperature creep test was performed under a 0.25% strain load, 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.

[0044]

[Table 1]

[0045]

Embodiments 6 to 9 Zylon X9108 was provided at the center of a heating cylinder of an SG125-HP molding machine such that 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 gas injection part, injection molding was performed into the mold cavity to obtain a boss-shaped flat molded product having the shape shown in FIG. Table 2 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 4 A flat molded article with a boss having the shape shown in FIG. 2 was prepared by the usual injection molding of Xylon X9108 at a standard resin temperature without dissolving carbon dioxide gas in the resin, and the flatness was measured. Was done. Table 2 shows the pressure during filling and the flatness of the molded product.

[0047]

COMPARATIVE EXAMPLE 5 Xylon X9108 was used at a standard resin temperature and the amount of carbon dioxide gas absorbed in the resin was 0.18% by weight.
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 2 shows the amount of carbon dioxide absorbed by the molded product, the pressure during filling, and the flatness of the molded product.

[0048]

[Table 2]

[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 (6)

[Claims] An amorphous resin composition is obtained by molding an amorphous resin composition, wherein the amorphous resin composition has a heat deformation temperature of 135 ° C. or more at a load of 1.82 MPa. Internal mechanical parts of office equipment obtained. 2. The office equipment obtained by molding the amorphous resin composition according to claim 1, wherein the amorphous resin composition is flame-retarded by a non-halogen flame retardant. Internal mechanism parts. 3. An internal mechanical component of office equipment obtained by molding the amorphous resin composition, wherein the amorphous resin composition has
The amorphous resin composition according to claim 1, wherein the amorphous resin composition is obtained by dissolving or absorbing carbon dioxide by weight of not less than weight% and then molding in a mold cavity. Internal mechanical parts of office equipment obtained. 4. An internal mechanical component of an office machine obtained by molding an amorphous resin composition, wherein the internal mechanical component has a foamed portion inside and a non-foamed layer of 500 μm or more on the surface of the molded product. An internal mechanical component of office equipment obtained by molding the amorphous resin composition according to any one of claims 1 to 3. 5. The amorphous resin composition according to claim 1, wherein the amorphous resin composition is a modified polyphenylene ether-based resin containing a polyphenylene ether component. Internal mechanical parts of office equipment obtained by molding. 6. The apparatus 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 obtained by molding the amorphous resin composition according to any of the above.