JP2007160653A - Method for producing resin molding derived from biomass raw material and resin molding derived from biomass raw material by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a molding produced from a biodegradable material which can promote the crystallization of a resin without elongating a molding cycle and has excellent impact strength and heat resistant temperature. <P>SOLUTION: A method for producing a molding of a resin derived from a biomass raw material in which the resin derived from the biomass raw material or a mixed resin of a resin derived from a petroleum raw material and the resin derived from the biomass raw material is injected into a mold 5 held at a temperature lower than the crystallization temperature and glass transition temperature of the resin derived from the biomass raw material, cooled, and solidified includes a process to obtain the molding 1 (housing) by demolding from the mold 5 and an annealing process to crystallize a place requiring geometrical accuracy of the molding 1 while the place is supported. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a molded article containing a resin derived from a biomass material which is excellent with respect to impact strength and heat resistant temperature, and a resin molded article obtained thereby.

In recent years, plastics have been used in large quantities in many fields, and their waste causes serious environmental problems such as landscape obstruction, adverse effects on marine life, and pollution of the global environment.
Conventionally used resins derived from petroleum raw materials include polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, and the like, and these resins have been disposed of by incineration or landfill.

However, these disposal methods are regarded as problems from the viewpoint of the environment.
For example, in the incineration method, resins such as polyethylene, polypropylene, and polystyrene have a problem in that the burned calories are high, which damages the furnace and shortens the durable life of the furnace.
Polyvinyl chloride has a problem of generating harmful gas during incineration although it has a low calorie burn.
Even in the landfill method, the above-mentioned resins derived from petroleum raw materials have a high chemical stability, so they remain semipermanently while retaining their original shapes, which leads to a serious shortage of landfill sites. .
That is, when the above-mentioned resins derived from petroleum raw materials are discarded in the natural environment, they are extremely stable, so that the aesthetics may be lost over a long period of time, or marine organisms, birds, etc. And cause environmental destruction.

In order to solve the above-described problems, research on biodegradable polymers has been actively conducted in recent years.
Examples of biodegradable plastics that have been studied for practical use include aliphatic polyesters, modified PVA (polyvinyl alcohol), cellulose ester compounds, modified starches, and blends thereof.
As the aliphatic polyester, a polylactic acid polymer has attracted attention as a semisynthetic polymer.
Resins derived from biomass materials, which are mainly made from plants, are environmentally friendly in that they use almost no petroleum as a raw material. Among the resins derived from biomass materials, especially polylactic acid has excellent biodegradability. Since it has, it attracts attention as a constituent material of a molded object.

However, since the biomass-derived resin generally has low strength and low heat resistance, it needs to be modified in order to contribute to practical use.
Specifically, the melting point and glass transition temperature are low, the crystallization temperature located in the middle is low, and the crystallization rate tends to be slow.
For example, polylactic acid has a melting point of about 170 ° C, a crystallization temperature of about 110 ° C, and a glass transition temperature of about 57 ° C. Little crystallization occurs in the process. Therefore, although it is a crystalline polymer, the heat resistance of the molded product has been below the glass transition temperature so far.

By improving the crystallization of the resin derived from the biomass material, the impact strength and the heat resistance temperature can be improved.
As a specific technique for promoting crystallization, there is a method of adding a powder such as talc, silica, calcium lactate or the like as a crystal nucleating agent to a resin derived from a biomass raw material (see, for example, Patent Document 1 below).
Other techniques include a method of annealing to promote crystallization of a molded product (for example, see Patent Document 2 below), and a method of promoting crystallization in a mold (for example, Patent Document 3 below). See).

However, in the method of adding a crystal nucleating agent as described in Patent Document 1 below, there are problems such that the obtained molded product becomes brittle and sinks are generated on the surface of the molded product.
In the technique described in Patent Document 2 below, there is a problem that a defect occurs in which a molded product is deformed during annealing.
Further, when crystallization is promoted in the mold as in the technique described in Patent Document 3 below, the mold occupation time is long, and a cost increase due to an increase in tact becomes a problem. Moreover, when the tact is raised and the mold is released, the non-crystallized portion is deformed at the time of the mold release.

If injection molding is carried out while keeping the mold at a low temperature of 20 to 40 ° C., the crystallization of polylactic acid will be slow and the process will take too much time.
For this reason, if it carries out by maintaining at the temperature which accelerates | stimulates crystallization, for example, 90-110 degreeC, much time will be required for cooling of a molded article.
When the temperature is equal to or higher than the glass transition temperature, the non-crystallized portion of the crystallized portion and the non-crystallized portion is softened even when the crystal portion is completely crystallized. For this reason, defects such as deformation occurred when the molded product was released from the mold.

JP-A-8-193165 JP-A-8-73628 JP 2005-74791 A

  In order to improve the above-mentioned conventional problems, it is necessary to improve the impact strength and heat-resistant temperature of the biomass-derived resin, but in order to promote crystallization, the review of the molding cycle becomes an issue. Although it is necessary to provide an annealing process after mold release from the mold to promote crystallization, even in such a process, the effect of suppressing deformation is still insufficient.

  Therefore, in the present invention, the crystallization of the resin is promoted without lengthening the molding cycle, and the deformation due to the annealing process is suppressed to a practically favorable range, and is derived from the biomass raw material excellent in impact strength and heat resistance temperature. We proposed a technology to provide the resin moldings at low cost.

  In the present invention, the resin derived from the biomass raw material, or the resin derived from the petroleum raw material and the resin derived from the biomass raw material, in a mold that is lower than the crystallization temperature of the resin derived from the biomass raw material and lower than the glass transition temperature. Is a method for producing a resin molded product derived from a biomass raw material obtained by injecting a blend resin and then solidifying by cooling, and performing a step of releasing the mold from the mold to obtain a molded product. A method for producing a resin-molded body derived from a biomass raw material is provided, which includes performing an annealing step of crystallizing in a state in which a portion requiring shape accuracy is supported.

  In the invention of claim 2, the resin derived from the biomass raw material or the resin derived from the petroleum raw material and the biomass raw material are placed in a mold that is lower than the crystallization temperature of the resin derived from the biomass raw material and lower than the glass transition temperature. Injecting a blend resin with a resin derived from, and then cooling and solidifying the biomass raw material-derived resin molded body, a step of obtaining a molded product by releasing from the mold, Provided is a method for producing a resin molded body derived from a biomass raw material, characterized in that an annealing step is performed in which the strain is relaxed in a state where a large strain of the molded body is supported.

  In invention of Claim 3, in the metal mold | die which is more than the glass transition temperature of resin derived from biomass raw material, and was hold | maintained more than crystallization temperature, resin derived from the said biomass raw material, or resin derived from petroleum raw material, and biomass A method for producing a resin molded body derived from a biomass raw material obtained by injecting a blend resin with a resin derived from a raw material and solidifying by cooling, and performing a step of releasing the mold from the mold and obtaining a molded product, A method for producing a resin molded product derived from a biomass material is provided, which is housed in a mold 2, held at a temperature near the crystallization temperature, subjected to shape correction, and then subjected to an annealing step of gradual cooling. To do.

  In invention of Claim 4, the annealing process of 5 degrees C / min or less is provided after the said annealing process, The manufacturing method of the resin molded object derived from the biomass raw material of Claim 1 or 2 characterized by the above-mentioned is provided. .

  The invention according to claim 5 is characterized in that the annealing step is carried out by batch processing with a plastic molded product housed in an apparatus capable of controlling the internal temperature. Provided is a method for producing a resin molded body derived from a biomass raw material.

  The invention according to claim 6 is characterized in that the annealing step is performed in an apparatus in which the plastic molded product is movable inside and the temperature distribution is controlled in the moving direction. The manufacturing method of the resin molded object derived from the biomass raw material as described in any one of Claims 1 thru | or 3 to provide is provided.

  The invention according to claim 7 is characterized in that the annealing step is performed by bringing a temperature-controlled member into contact with a resin molded body derived from a biomass raw material. The manufacturing method of the resin molding derived from the biomass raw material as described in 1. is provided.

  In invention of Claim 8, the said temperature-controlled member was applied to the hand part of the taking-out machine of a plastic molding apparatus, The manufacturing method of the resin molded object derived from the biomass raw material of Claim 7 characterized by the above-mentioned. provide.

  The invention according to claim 9 is characterized in that the resin derived from the biomass material is composed mainly of polylactic acid, and the resin molding derived from the biomass material according to any one of claims 1 to 3 A method for manufacturing a body is provided.

  In the invention of claim 10, the biomass according to any one of claims 1 to 3, wherein the secondary forming process is performed by any one of multicolor molding, insert molding, and outsert molding. A method for producing a resin-molded body derived from a raw material is provided.

  In invention of Claim 11, the location which requires the shape dimensional accuracy of the said molded object, and another site | part shall differ from each other in crystallinity degree, The biomass raw material origin of Claim 1 characterized by the above-mentioned. A resin molded body derived from a biomass material produced by the method for producing a resin molded body of the present invention is provided.

  In invention of Claim 12, the said molded object shall be a member which has a predetermined | prescribed gate part, and the location with the said large distortion shall be the said gate vicinity, Resin derived from the biomass raw material of Claim 2 A resin molded body derived from a biomass material, which is produced by a method for producing a molded body, is provided.

  In the invention of claim 13, the molded article is an optical system housing.

  According to the method of the present invention, the crystallization of the resin can be promoted in a short molding cycle, and the deformation of the resin by the annealing process can be induced to places other than those requiring shape dimensional accuracy, and excellent in impact strength and heat resistance temperature. A resin molded body derived from a biomass raw material can be provided at a low cost (claim 1).

  Resin distortion can be promoted, deformation due to the annealing process can be prevented, and a resin molded body derived from a biomass material having impact strength and heat resistance temperature can be provided at low cost.

  A resin molded body derived from a biomass material that can promote resin crystallization without lengthening the molding cycle, and can correct the shape deformation that occurred during mold release by an annealing process, and has excellent impact strength and heat resistance temperature. It can be provided at low cost (claim 3).

  By performing a slow cooling process at 5 ° C./min or less after the annealing process, rapid cooling of the molded body can be prevented, deformation is avoided, and a resin molded body derived from a biomass material having excellent impact strength and heat resistance temperature is reduced. It can be provided at a cost (claim 4).

  By storing the resin molded body derived from the biomass raw material in the apparatus in which the annealing process can control the internal temperature, and performing it by batch processing, the annealing process can be performed using general-purpose equipment, Equipment investment is suppressed, and a resin molded body derived from a biomass material having excellent impact strength and heat resistance temperature can be provided at a low cost (Claim 5).

  The annealing process can be continuously performed by performing the annealing process using an apparatus in which the resin molded body derived from the biomass material can move inside and the temperature distribution is controlled in the moving direction. As a result, it is possible to provide a resin molded body derived from a biomass material having excellent impact strength and heat resistance temperature at a low cost (Claim 6).

  Since the temperature controlled member is brought into contact with the biomass material-derived resin molded body and the annealing process is performed, the shape supporting member and the temperature controlling member can be shared, and excellent impact strength and heat resistance temperature It was possible to provide a low-cost resin molded body derived from a biomass raw material having the following (Claim 7).

  By applying the temperature-controlled member to the take-out machine hand part of the plastic molding apparatus, the annealing process can be performed in the take-out machine hand part of the plastic molding apparatus, and has excellent impact strength and heat resistance temperature. It was possible to provide a resin molded body derived from a biomass material having a low cost (claim 8).

  By selecting a resin mainly composed of polylactic acid as the resin derived from the biomass raw material, good molding processability can be realized, and a resin molded body derived from a biomass material having excellent impact strength and heat resistance temperature can be obtained at low cost. (Claim 9).

  By applying the secondary molding process to the biomass raw material-derived resin molded body by any one of multicolor molding, insert molding, or outsert molding, the application range of the biomass raw material-derived resin molded body is expanded. Various shaped bodies can now be provided with resins derived from biomass raw materials (claim 10).

  The rigidity of the entire molded body can be secured, and deformation by the annealing process can be induced to places other than those requiring shape dimensional accuracy, and a resin molded body derived from a biomass material having excellent impact strength and temperature can be provided at low cost. (Claim 11).

  It is possible to provide a resin molded body derived from a biomass raw material that can support a deformed portion due to strain relaxation and has excellent impact strength and heat resistance temperature (Claim 12).

Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following examples.
[Example 1]
FIG. 1 is a schematic view of a housing (housing) of an optical device used in a copying machine and a printer used in the method of the present invention.
A housing 1 as a molded product is a housing of an optical device that includes a support base 2 that supports an optical element, an engagement pin 3, and a bottom wall portion 4.

In this optical apparatus, the places that require the shape and dimensions are the support base 2 and the engagement pin 3.
As a molding resin, a resin derived from a biomass raw material, for example, a resin derived from a blended biomass raw material containing 50 wt% of a mixture of polylactic acid and polycarbonate is used.
Polylactic acid has a melting point of about 170 ° C., a crystallization temperature of about 110 ° C. and a glass transition temperature of about 57 ° C., and polycarbonate has a melting point of about 220 ° C. and a glass transition temperature of about 145 ° C.

FIG. 2 shows a schematic cross-sectional view of an injection mold 5 applied to the method of the present invention.
A region surrounded by a pair of cavity pieces 6 forming a cavity surface is a cavity 7.
The mold base 8 is provided with a cartridge heater 9 for heating the entire mold and a thermocouple 10, and the cartridge heater 9 and the thermocouple 10 are provided with a predetermined temperature control device prepared outside the mold. (Not shown).

Next, a specific operation of the method of the present invention will be described.
The injection mold 5 is set in a predetermined injection molding machine (not shown), and the housing 1 is molded.
The cylinder temperature is set to 210 ° C., and the cartridge heater 9 is set so that the mold is 40 ° C. which is lower than the crystallization temperature of the resin derived from the biomass raw material (in this case, polylactic acid) and lower than its glass transition temperature. And the cavity 7 is filled with molten resin. And the temperature of the cartridge heater 9 is adjusted so that a metal mold | die may be hold | maintained at 40 degreeC.
Next, a resin pressure is generated in the cavity 7 to bring the resin into close contact with the cavity piece 6.
Next, the solidified resin molded body derived from the biomass material is taken out from the mold using a molded product take-out device (not shown) and allowed to cool to room temperature.

After releasing from the mold as described above, an annealing process is performed in which crystallization is performed in a state where a portion requiring the shape and dimension accuracy of the molded body is supported.
3A and 3B are schematic diagrams of the forming process and the annealing process, respectively.
The housing 1 produced in the molding process of FIG. 3A is transferred to the annealing process of FIG.
In the annealing step, temperature control is performed using a general-purpose constant temperature bath 11, and the support member 12 is brought into contact with the support base 2 and the engagement pin 3 so as to prevent deformation of the crystallization temperature. Hold at 110 ° C. in the vicinity for 1 hour, and then slowly cool to 30 ° C., which is below the glass transition temperature, at 3 ° C./min.

FIG. 4 shows the temperature history of the molded product.
The slow cooling rate was 3 ° C./min.
Considering the tact, it can be produced at a lower cost as the speed is increased, but it was confirmed that when the speed was increased at a rate higher than 5 ° C./min, a new strain was generated due to rapid cooling. Therefore, it is necessary to gradually cool at 5 ° C./min or less, more desirably at 3 ° C./min or less.

  According to the method of the present invention, by using a resin derived from a biomass raw material, it is possible to promote the crystallization of the resin without lengthening the molding cycle, and the deformation due to the annealing process requires a shape dimensional accuracy. It can be guided to places other than locations, and can realize excellent impact strength and heat resistance temperature.

Next, a comparative example for the method of the present invention will be described.
[Comparative Example 1]: A molded product is manufactured without performing the annealing step.
[Comparative Example 2]: In the annealing step, a molded product is manufactured without supporting a portion requiring the shape dimensional accuracy of the molded body.
[Comparative Example 3]: A mold temperature in injection molding is set to 100 ° C., and a molded product is manufactured without performing the annealing process, which is the next process.

In Comparative Example 1, crystallization of the molded article was insufficient, the heat resistance was weak, the heat resistance temperature was low, and a product that was sufficiently excellent in practical use was not obtained.
In Comparative Example 2, crystallization progressed and both the heat resistance strength and the heat resistance temperature were sufficiently excellent in practical use, but the shape was deformed during the annealing process.
In Comparative Example 3, the degree of crystallinity could be increased by controlling the cooling time in the mold, but the molding cycle became longer, resulting in higher costs. Further, deformation occurred at the time of mold release, and the overall yield was low.

  In the above-described embodiment according to the method of the present invention, since the deformation during the annealing process is induced to a place other than the portion requiring the shape dimensional accuracy, a molded body having excellent impact strength and heat resistance temperature can be obtained at low cost. It was confirmed that it could be produced.

When the degree of crystallinity of the molded body produced by the example according to the present invention described above was measured, it was confirmed that the supported portion and the unsupported portion had different crystallinity.
FIG. 5 shows the relationship between the half-crystallization time and temperature of polylactic acid alone.
In the embodiment according to the present invention, the annealing process ensures a sufficient crystallization time more than that shown in FIG. 5, but the temperature history and Differences in temperature distribution occurred, confirming that differences in crystallinity occurred.

Examples of the resin molded body derived from the biomass raw material produced by the method of the present invention include a housing such as a housing as a suitable example. However, the method of the present invention does not depend on the shape of the molded product, and has any shape. It can be applied to a molded body.
In other words, the method of the present invention for obtaining a desired shape and a desired degree of crystallinity through an annealing process in which a portion requiring a shape dimensional accuracy of the molded body is supported is obtained by any molding method. It can be applied to the body manufacturing process.

In Example 1 described above, a resin derived from a blended biomass material containing 50% by weight of polylactic acid and polycarbonate was applied as the biomass material-derived resin molded body, but the present invention is not limited to this material. .
That is, 100% polylactic acid resin can also be applied, and the content thereof can be adjusted as appropriate.
Moreover, conventionally well-known resin materials, such as PMMA other than PC, PS, ABS, can be applied also to a blend material.
The method according to the present invention is characterized in that an annealing process is applied in which crystallization is performed in a state where a portion requiring shape accuracy of the molded body is supported. Thus, a molded body excellent in impact strength and heat resistance temperature is produced.

  In the above embodiment, in the production of a molded body using a resin derived from biomass raw material, an injection molding method is applied, but the method of the present invention is in a state of supporting a portion that requires the shape and dimension accuracy of the molded body It has a feature in that it has an annealing process for crystallizing at, and does not necessarily require an injection molding process. For example, when producing a molded body such as a press-fit pin or a hook that requires high durability, a process such as multicolor molding or insert molding can be applied.

In the process for producing a molded body of a resin derived from a biomass material according to an embodiment of the present invention, the annealing process is performed in a thermostatic bath, but the present invention is not limited to such a process. For example, a method of bringing the temperature-controlled material into contact with the support member 12 itself, or a material taken out from an injection mold as shown in FIGS. 6A and 6B, is provided with a temperature distribution. Alternatively, the annealing process may be performed continuously by moving the temperature controller 13 using the belt conveyor 14.
Moreover, when performing an annealing process using a thermostat, many molded objects may be annealed simultaneously by batch processing, and in this case, productivity can be remarkably improved.

  As described above, a resin derived from a biomass raw material that is a plant-based raw material, which is a molded product material of the present invention, is a material that is excellent in terms of impact on the environment in that it uses almost no petroleum as a raw material. Polylactic acid is a material excellent in biodegradability.

[Example 2]
FIG. 7 shows a schematic diagram of an input / output terminal cover 15 used in a copying machine or a printer.
The input / output terminal cover 15 has a gate portion 16 at the end.
The used resin shall be the resin derived from the blend biomass raw material which contains the polylactic acid and the polycarbonate similar to Example 1 50 wt% each.

Next, the process in Example 2 is demonstrated.
The injection molding process is the same as in the first embodiment.
After the mold release, an annealing step for relaxing the strain is performed in a state where a portion where the strain of the molded body is large is supported.
8A and 8B are schematic views of the annealing process. FIG. 8B shows an enlarged view of the main part of FIG.
The temperature control in the annealing process employs a method in which a film heater 18 is provided in the take-out machine hand portion 17 of the plastic molding apparatus.
By performing temperature control by abutting a temperature-controlled member, the annealing effect is preferentially exhibited only in a necessary portion, and the annealing process can be performed in a short time and with energy saving.
The control temperature is maintained at 110 ° C. near the crystallization temperature for 10 minutes, and then cooled to room temperature.
According to Example 2, the molded body made from the biomass raw material-derived resin was able to promote crystallization of the resin without lengthening the molding cycle.
Moreover, since the temperature control of the annealing process is performed by the take-out machine hand part of the plastic molding apparatus, the molded product taking-out process and the annealing process can be performed simultaneously, and the productivity is excellent.
In addition, the annealing process can sufficiently relax the distortion of the molded product, can avoid deformation caused by the relaxation of the distortion, and can produce a resin molded body derived from biomass material that is excellent in impact strength and heat resistance temperature. It was.

Example 3
FIGS. 9A to 9C are schematic views of an optical disk substrate 19 such as a CD or a DVD manufactured in the third embodiment. 9A shows a schematic plan view, FIG. 9B shows a schematic cross-sectional view, and FIG. 9C shows an enlarged cross-sectional view.
The optical disk substrate 19 is a molded body that is filled from the center of the circle and is molded by flowing a resin in a radial pattern, and the warping specifications are relatively strict.
As the resin, a resin derived from a biomass raw material mainly containing polylactic acid as in Example 1 is used.

Next, the process in Example 3 is demonstrated.
A predetermined injection mold is set in an injection molding machine, and the optical disk substrate 19 is molded.
The cylinder temperature is set to 210 ° C., and the mold is heated with a heater so that the temperature is 120 ° C. which is higher than the glass transition temperature of the resin derived from the biomass raw material and higher than the crystallization temperature. Fill.
And a metal mold | die is kept at 120 degreeC.
Next, resin pressure is generated in the cavity so that the resin is brought into close contact with the cavity piece, and then the solidified resin molded body derived from the biomass material is taken out from the mold using a molded product take-out device (not shown). Allow to cool to room temperature.
After the mold release, an annealing process is performed in which the mold is stored in the second mold and held at a predetermined temperature, and then gradually cooled.
FIG. 10 shows a schematic diagram of the annealing process.
The temperature control in this example is performed using the upper mold 20 and the lower mold 21, set these at 110 ° C., and the upper mold 20 moves up and down and pressurizes and deforms mainly at the time of mold release, mainly warpage. The shape is corrected for the component.
Hold at 110 ° C. near the crystallization temperature for 1 hour, and then slowly cool to 30 ° C., which is below the glass transition temperature at 3 ° C./min.
FIG. 11 shows the temperature history of the molded product in this example.

In this example, because the molding is performed using a mold set at a temperature of 120 ° C. that is higher than the glass transition temperature of the resin derived from the biomass raw material that is the resin used and is higher than the crystallization temperature, it has excellent transferability. Therefore, this method is suitable for a molded product that needs to transfer a fine shape such as the optical disk substrate 19 or a molded product that has an appearance decoration.
Further, since the mold release temperature is high, there is a possibility that deformation such as warping may occur at the time of mold release. However, in this embodiment, the shape is corrected by storing it in the second mold and further performing an annealing process. A molded product having a desired shape can be produced.

According to the embodiment of the method of the present invention, the crystallization of the resin is promoted without lengthening the molding cycle, and the deformation due to the mold release can be corrected in the second mold. Thus, a resin molded product derived from a biomass raw material having excellent impact resistance strength and heat resistance temperature can be produced.
In the present embodiment, since the second metal mold has a step of correcting the shape, the second metal mold is not complicated. For example, the schematic plan view of FIG. 12A and the schematic of FIG. It is suitable for producing a plate shape such as the light guide plate 22 as shown in the cross-sectional view and the enlarged cross-sectional view of FIG.

The schematic of the housing | casing (housing) of an optical apparatus is shown. The schematic sectional drawing of the metal mold | die for injection molding applied to the method of this invention is shown. (A) A molding process diagram is shown. (B) An annealing process diagram is shown. The temperature history of a molded product is shown. The relationship between the half crystallization time by polylactic acid simple substance and temperature is shown. (A) A molding process diagram is shown. (B) An annealing process diagram is shown. The schematic of the input-output terminal cover which is an example of a molded article is shown. (A) The schematic of an annealing process is shown. (B) The enlarged view of the principal part of Fig.8 (a) is shown. (A) The schematic plan view of an optical disk board | substrate is shown. (B) The schematic sectional drawing of an optical disk board | substrate is shown. (C) The expanded sectional view of an optical disk substrate is shown. The schematic of an annealing process is shown. The temperature history of a molded product is shown. (A) The schematic plan view of a plate-shaped object is shown. (B) The schematic sectional drawing of a plate-shaped object is shown. (C) The expanded sectional view of a plate-shaped object is shown.

Explanation of symbols

1 Housing (molded product)
DESCRIPTION OF SYMBOLS 2 Support stand which supports an optical element 3 Engagement pin 4 Bottom wall part 5 Mold for injection molding 6 Cavity piece 7 Cavity 8 Mold base 9 Cartridge heater 10 Thermocouple 11 Constant temperature bath 12 Support member 13 Temperature control device 14 Belt conveyor 15 Input / output terminal cover 16 Gate portion 17 Unloader hand portion 18 Film heater 19 Optical disk substrate 20 Upper mold 21 Lower mold 22 Light guide plate

Claims (13)

In the mold held below the crystallization temperature of the resin derived from the biomass raw material and below the glass transition temperature,
Injecting a resin derived from the biomass raw material or a blend resin of a resin derived from a petroleum raw material and a resin derived from a biomass raw material,
A method for producing a resin molded body derived from a biomass raw material obtained by cooling and solidifying,
Demolding from the mold to obtain a molded product;
A method for producing a resin molded body derived from a biomass raw material, comprising: an annealing step of crystallizing the molded body in a state where a portion requiring shape accuracy is supported. In the mold held below the crystallization temperature of the resin derived from the biomass raw material and below the glass transition temperature,
Injecting a resin derived from the biomass raw material or a blend resin of a resin derived from a petroleum raw material and a resin derived from a biomass raw material,
A method for producing a resin molded body derived from a biomass raw material obtained by cooling and solidifying,
Demolding from the mold to obtain a molded product;
A method of producing a resin molded body derived from a biomass material, comprising an annealing step of relaxing the strain in a state where a portion where the distortion of the molded body is large is supported. In a mold that is above the glass transition temperature of the resin derived from the biomass raw material and that is held above the crystallization temperature,
Injecting a resin derived from the biomass raw material or a blend resin of a resin derived from a petroleum raw material and a resin derived from a biomass raw material,
A method for producing a resin molded body derived from a biomass raw material obtained by cooling and solidifying,
Demolding from the mold to obtain a molded product;
A method for producing a resin molded body derived from a biomass material, comprising an annealing step of storing in a second mold, holding at a temperature near a crystallization temperature, and then gradually cooling.   The method for producing a resin molded product derived from a biomass material according to claim 1 or 2, wherein a slow cooling step of 5 ° C / min or less is provided after the annealing step.   3. The resin-molded body derived from biomass material according to claim 1 or 2, wherein the annealing step is performed by batch-processing a plastic molded product housed in an apparatus capable of controlling the internal temperature. Production method.   4. The annealing process according to any one of claims 1 to 3, wherein the annealing step is performed in an apparatus in which the plastic molded product is movable and the temperature distribution is controlled in the moving direction. A method for producing a resin molded product derived from a biomass raw material according to claim 1.   4. The biomass-derived resin according to claim 1, wherein the annealing step is performed by bringing a temperature-controlled member into contact with a biomass-derived resin molded body. 5. Manufacturing method of a molded object.   8. The method for producing a resin molded body derived from a biomass material according to claim 7, wherein the temperature-controlled member is applied to a hand portion of a take-out machine of a plastic molding apparatus.   The method for producing a resin molded product derived from a biomass material according to any one of claims 1 to 3, wherein the resin derived from the biomass material contains polylactic acid as a main component.   4. The production of a resin molded body derived from a biomass material according to any one of claims 1 to 3, wherein secondary molding is performed by any one of multicolor molding, insert molding, and outsert molding. Method.   2. The method for producing a resin-molded body derived from a biomass raw material according to claim 1, wherein the portion requiring the dimensional accuracy of the shaped body and the other portion have different crystallinity. A resin molded body derived from the produced biomass material.   The said molded object shall be a member which has a predetermined gate part, and the location with the said large distortion shall be the said gate vicinity, It is produced with the manufacturing method of the resin molded object derived from the biomass raw material of Claim 2. A resin molded article derived from a biomass material, It is a housing of an optical system, The resin molded object derived from the biomass raw material of Claim 11 or 12.

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