JP4442201B2 - Method for producing fluororesin coated member - Google Patents

Description

  The present invention relates to a resin molded member for molding a resin container used for beverages, foods, cosmetics, etc., and in particular, a bottle capable of filling contents such as tea, water, juice, alcohol, coffee, Alternatively, the present invention relates to a cup, a fluororesin coat member for forming a container such as a tray-like polyester resin, and a mold.

Polyester resin containers such as PET (polyethylene terephthalate) resin, as represented by containers such as bottles, cups and trays, are excellent in transparency, impact resistance, gas barrier properties, etc., and are produced and used in a wide variety of forms. Its manufacture has become an important industrial field. A bottle in a polyester container is formed by biaxial stretch blow molding in a molding die immediately after heating a preform obtained by injection molding in a temperature range of 100 ° C. to 130 ° C. above the glass transition temperature (Tg). Manufactured.
The heat-resistant polyester bottle used for hot filling is heated at a temperature of 100 ° C to 180 ° C of the polyester crystallization temperature after biaxial stretch blow molding, and the bottle is heat-set in a high temperature range. Thus, heat resistance is imparted.

On the other hand, the cup and tray in the polyester container are manufactured by vacuum-suctioning a polyester sheet into a female mold (molding mold) having a container shape, or by drawing with the female mold and the plug.
Further, heat resistant cups and trays used for hot filling are imparted with heat resistance by forming a female mold and a plug by heating to a crystallization temperature as in the case of a bottle.

  In molds for molding such polyester containers, in addition to mold releasability from the polyester resin during molding, smoothness of the mold inner surface is required for the purpose of imparting surface gloss and transparency of the product. Conventionally, stainless steel or aluminum alloy is used as a raw material, and the inner surface of the mold is cut and then the surface is mirror polished.

Further, in the molding of a heat-resistant polyester container, a part of the polyester resin on the surface of the container or an oligomer component or additive in the polyester resin adheres and accumulates on the surface of the mold to be molded, and the uneven shape of the adhered deposit is Since it was transferred to the surface of the polyester container after molding and the gloss and transparency of the container surface were lowered, there was a problem that it was necessary to clean the mold in a short period of time.
This oligomer adheres even when the oligomer concentration in the resin is very small, it diffuses to the surface of the container at the time of molding and becomes a high concentration, which migrates to the mold surface and produces crystalline deposits. It is known as a phenomenon peculiar to containers.

Furthermore, in the above-described mirror-polished molding die, the releasability tends to deteriorate, and therefore the surface of the molding die is roughened in advance, but the surface of the molding container is rough. May result.
In particular, in the molding of heat-resistant polyester containers, the mold is heated to 100 ° C. to 180 ° C. for the purpose of imparting heat resistance and heat-fixed. There was a problem that the force was increased and the container shape was easily deformed when the mold was released.
The above problem is an important industrial issue because it reduces the production efficiency and product quality in today's high-speed mass production of polyester containers.

On the other hand, there has been proposed a mold for forming a release film by coating a plastic mold with a fluororesin on the mold surface (see Patent Document 1, Patent Document 2, and Patent Document 3).
In addition, the present applicant has proposed a polyester container mold in which a release resin is coated with a fluorine-based resin on the mold surface in order to solve the above-described problems in molding a polyester container (Patent Document 4). reference).
JP-A-4-353406 JP-A-4-353407 JP-A-5-245848 JP 2002-18858 A

  However, in Patent Documents 1 to 4, it is necessary to perform fluororesin film formation or baking to obtain the necessary strength of the fluororesin film when coating the fluororesin. In this baking, when an aluminum substrate is used for the purpose of reducing the weight as the metal substrate of the mold, baking is performed under a baking temperature necessary for heat melting the fluororesin, for example, 320 ° C., There is a problem that the metal base of the mold is softened, cracks in the metal base of the mold, dimensional changes of the mold, and scratches on the surface when the mold is used, shortening the mold life.

  The problem of the present invention is to solve the above-mentioned problems, and while suppressing the metal base material, the metal base material is suppressed to 180 ° C. or less, and the fluororesin layer film is baked and melted by heating, so that the metal base material does not soften The purpose is to provide a member coated with fluororesin, and by preventing the adhesion of resin and oligomer, there is little shape change when leaving the mold, and the resin such as polyester is excellent in gloss and transparency. It aims at providing the metal mold | die which enables shaping | molding of a container.

The method for producing the fluororesin-coated member of the present invention is as follows.
When providing a heat insulating layer having a lower thermal conductivity than the metal base material on the metal base material, cooling the metal base material and providing a fluororesin layer by heating and melting the fluororesin on the heat insulating layer,
The metal substrate is cooled at 180 ° C. or lower.
In this case, the metal substrate is desirably an aluminum substrate having a Vickers hardness Hv of 300 g and 90 or more.

According to the method for producing a fluororesin-coated member of the present invention, it becomes possible to coat a fluororesin without causing softening of the metal base material, and it is possible to prevent dimensional changes of the fluororesin-coated member and scratches on the surface. it can.
In particular, when manufacturing polyester bottles, cups, and tray-like polyester containers, it is possible to prevent adhesion of resin and oligomer to the mold, less change in shape when leaving the mold, and gloss and transparency. It is possible to mold a resin container such as polyester having excellent properties.

A fluororesin coat member (sometimes referred to as “the fluororesin coat member of the present invention” in the present specification) by the method for producing a fluororesin coat member of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a cross-sectional structure of an embodiment of a fluororesin coated member of the present invention.
FIG. 2 is an enlarged cross-sectional view of the fluororesin coated member of the present invention shown in FIG.
As shown in FIG. 1, the fluororesin coat member 1 of the present invention includes a metal substrate 10, a roughened heat insulating layer 20 that covers the surface of the metal substrate 10, and an adhesive film that covers the surface of the heat insulating layer 20. 30, a fluororesin layer 40 covering the adhesive film 30 is formed.

As the metal base material 10 which is the base material of the fluororesin coat member 1, it is preferable to use an aluminum alloy for reasons such as light weight and easy cutting, but in addition, magnesium alloy, titanium alloy, etc. Can also be used.
In the present invention, it is desirable to use a material having a Vickers hardness (Hv of 300 g) of 90 or more as the hardness of the metal base material 10 and having the hardness of 90 or more causes damage to the mold at the time of molding the container described above. Can prevent scratches and distortion.

The fluororesin coat member 1 of the present invention is made in a predetermined shape by means such as cutting the metal substrate 10, but the heat insulating layer 20 is formed on the surface of the fluororesin coat member 1 after cutting, The thermal conductivity of the heat insulating layer is set to 20 [W / m · k] or less because the metal base material of the mold 10 when the fluororesin is coated is softened, the dimensions of the mold are changed, and the surface of the mold is used. It is preferable at the point which prevents a damage.
This heat insulating layer 20 prevents heat conduction to the metal base material 10 when the fluororesin is coated and heated and melted, thereby preventing the metal base material 10 from being softened. It has a role of preventing dimensional change of the mold and scratching of the surface when using the mold.
Examples of the heat insulating layer 20 include alloys, metal oxides, and ceramics.

Examples of the alloy include nickel alloys such as iron-nickel alloy, nickel-chromium alloy, nickel-phosphorus alloy, nickel-boron alloy, and iron alloys such as iron-chromium alloy and iron-nickel-chromium alloy.
Examples of the metal oxide include aluminum oxide, chromium oxide, iron oxide, and nickel oxide.
Examples of the ceramic include metal nitrides such as titanium nitride and chromium nitride, carbides such as chromium carbide, and the like, and one or a combination of these, or a combination with other different ceramics.

For the formation of alloys and metal oxides, known wet plating methods and dry plating methods can be used. As wet plating methods, electrolytic methods and electroless methods are used, and as dry plating methods, thermal spraying methods and CVD methods are used. , PVD method and the like, and sol-gel method can also be adopted.
Among these, when an aluminum alloy is used as the metal substrate, Ni—P alloy plating is preferably used as the heat insulating layer 20 because of its excellent adhesion to the metal substrate.
For the Ni-P alloy plating, either electroless plating or electrolytic plating can be used.

The thickness of the heat insulating layer 20 formed on the surface of the metal substrate is preferably 5 to 100 μm.
If the thickness is less than 5 μm, the heat insulating effect on the metal substrate 10 is small, the heat is deprived of the metal substrate during baking of the fluororesin, the baking of the fluororesin becomes insufficient, and the required strength of the fluororesin layer film is It cannot be obtained, or the ambient temperature is extremely high, or a long time is required for baking, which is not preferable in terms of equipment or economy.
On the other hand, if it exceeds 100 μm, the heat insulating layer 20 may be cracked due to being too thick, and it is not economically preferable.

The heat insulation layer 20 preferably has a thermal conductivity of 20 [W / m · k] or less.
If the thermal conductivity exceeds 20 [W / m · k], the metal base material is deprived of heat, and the fluororesin is not sufficiently baked, and the required strength of the fluororesin layer film cannot be obtained.
And it is preferable that the heat insulation layer 20 is precision-finished by grinding | polishing, sandblasting, etc. so that centerline average surface roughness (Ra JIS B 0601-1994) may be 0.02-0.3 micrometer.
When the center line average surface roughness (Ra) is less than 0.02 μm, the number of the concavo-convex portions to be formed is reduced, and the retention of the fluororesin layer 40 is lowered. On the other hand, when it exceeds 0.3 μm, This is because it is difficult to reduce the surface roughness of the formed fluororesin layer 40.

An adhesive film 30 is formed on the heat insulating layer 20. The adhesive film 30 serves as an adhesive between the heat insulating layer 20 and the fluororesin layer 40.
Examples of the adhesive film 30 include a metal oxide, a metal hydroxide, and a silane coupling agent.
Further, the thickness of the adhesive film 30 is preferably 0.001 to 0.05 μm, and if it is less than 0.001 μm, it is difficult to cover the heat insulating layer 20, while if it exceeds 0.05 μm, fine irregularities It is not preferable because the concave portion of the portion 21 is filled or there is a risk of cohesive failure between the adhesive layers, and the adhesiveness of the fluororesin layer 40 decreases.
Furthermore, the surface roughness of the adhesive film 30 is such that the center line average surface roughness (Ra: JIS B 0601-1994) is 0.02 to 0.3 μm in terms of improving the adhesiveness of the fluororesin layer. Preferably, when the thickness is less than 0.02 μm, the number of uneven portions formed is reduced, the retention of the fluororesin layer 40 is reduced, and when it exceeds 0.3 μm, the surface roughness of the fluororesin layer 40 formed thereon is reduced. This is because it is difficult to reduce the thickness.
In addition, as a formation method of the adhesive film 30, a spray method, a dipping method, an electrolysis method, etc. are mentioned.

A fluororesin layer 40 is formed on the adhesive film 30.
The fluororesin layer 40 has a property of not attaching a polyester resin, an oligomer, and an additive, and is required to have surface smoothness that can guarantee the gloss and transparency of the molded polyester container.
Further, the thickness of the fluororesin layer 40 is preferably in the range of 0.1 to 3 μm, and if it is less than 0.1 μm, the uniformity of the coating on the metal substrate 10 is impaired and the coating defects increase. If the thickness exceeds 3 μm, rough skin derived from creep deformation during molding increases, the gloss and transparency of the polyester container after molding decrease, and the processing cost increases, which is not economical.

The fluororesin layer 40 is subjected to precision finishing by buffing or the like as necessary so that the center line average surface roughness (Ra JIS B 0601-1994) is 0.05 to 0.25 μm. Is preferred.
The center line average surface roughness (Ra) is practically difficult to be less than 0.05 μm, and it takes time for buffing or the like. On the other hand, when it exceeds 0.25 μm, the fluororesin coat of the present invention is used. This is because the mirror surface state of the member surface is inferior and the resin molded product may be fogged.
Therefore, when the center line average surface roughness (Ra) of the fluororesin layer 40 after baking is 0.25 μm or less, it can be used for molding as it is, but when it exceeds 0.25 μm, the buffing finish etc. It is preferable that the mirror surface is made to have a center line average surface roughness (Ra) of 0.25 μm or less.

In addition, by making the surface of the fluororesin layer 40 smooth, particularly when the fluororesin coat member 1 is a mold for a polyester container, adhesion of the polyester resin, oligomer or additive is prevented, and gloss and transparency are achieved. It is possible to produce a polyester container excellent in the above.
Furthermore, the fluororesin layer 40 is present on the outermost surface of the mold, and the centerline average surface roughness (Ra) of the surface of the fluororesin layer 40 is set in the above range, so that the fluororesin layer 40 when using the long-term mold is used. It is possible to prevent roughening of the skin, maintain and stabilize excellent surface specularity, facilitate release of the polyester container from the mold at the time of molding, and prevent a shape change at the time of mold release.

  As the fluororesin used for the fluororesin layer 40, any known fluororesin may be used. Polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / perfluoroalkyl Amorphous vinyl ether copolymers and their modified epoxy resins, modified acrylic resins, modified block acrylic resins, tetrafluoroethylene / perfluoro (2,2-dimethyl-1,3-dioxole) copolymers, etc. The fluorocarbon resin can be used alone or in combination.

The fluororesin layer 40 is formed by providing a heat insulating layer such as an alloy having a lower thermal conductivity than the metal base material on a metal base material such as an aluminum alloy, cooling the metal base material, and the heat insulating layer. A fluororesin is baked and melted by heating to provide a fluororesin layer.
And it is preferable to perform cooling of the said metal base material at 180 degrees C or less from a viewpoint of preventing the hardness fall of a metal base material.
In addition, the heat melting of the fluororesin makes it possible to melt the fluororesin and further prevent the decomposition or volatilization of the fluororesin so that the fluororesin has a temperature 20 to 120 ° C. higher than its melting point or glass transition point. Preferably, the heating atmosphere temperature and the heating time in an electric furnace or the like are appropriately selected to obtain the above temperature. The heating means is not limited to the electric furnace, and any method such as infrared heating, flame heating, high frequency heating, plasma heating, laser heating, etc. can be used.

The fluororesin-coated member of the present invention can be used as a die for forming a polyester container, particularly for biaxial stretch blow molding of a polyester bottle.
In the following examples, the case where the polyester bottle is used as a biaxial stretch blow mold for a polyester bottle will be described.

[Evaluation]
1. Measurement of thermal conductivity of metal substrate The thermal conductivity of an aluminum alloy, which is a mold substrate, is obtained by measuring the thermal diffusivity and specific heat capacity using a laser flash method thermal measurement device (TC-7000) manufactured by ULVAC-RIKO Co., Ltd. Moreover, specific gravity is calculated | required by Toyo Seiki Seisakusho Co., Ltd. DENSIMTER-H, respectively.
Thermal conductivity was obtained from the relationship of thermal conductivity [W / m · K] = thermal diffusivity [m ² / s] × specific heat capacity [J / Kg · K] × specific gravity [Kg / m 3].

2. Measurement of Thermal Conductivity of Heat Insulating Layer The heat conductivity of the heat insulating layer is a known value based on literature values, for example, “Surface Technical Handbook” P848 edited by Metal Surface Technology Association, Uemura or Okuno Pharmaceutical Technical Data.
Alternatively, the thermal diffusivity is obtained with the ULVAC Riko Co., Ltd. optical AC method thermal diffusivity measuring device (Laser-PIT), and the specific gravity is obtained with the DENSIMTER-H manufactured by Toyo Seiki Seisakusho Co., Ltd. The thermal conductivity was determined from the specific heat capacity.

3. Softening of metal base material of mold The Vickers hardness (Hv 300 g) of the metal base material after forming the fluororesin layer was measured.

4). Strength of fluororesin layer film Biaxial stretch blow was performed, and when 100 bottles were formed, the presence or absence of peeling of the fluororesin film was examined. In addition, if peeling did not occur at this time, it was confirmed that peeling did not occur even if molded for a long time.
○ No peeling × With peeling

5). Adhesion of resin component of mold after biaxial stretch blow molding After 120 hours have passed since the start of biaxial stretch blow molding, the mold is removed from the molding machine and the amount of polyester resin (including oligomers) adhered to the inner surface of the mold is measured. It was measured. The measuring method is 1,1,1,3,3,3, -resin component adhering to the above mixed solvent while lightly wiping with quartz wool soaked in a 1: 1 solvent mixture of hexafluoro-2-propanol and chloroform. It was dissolved and measured by gel permeation chromatography (GPC method).
For the measurement, weigh a certain amount of the polyester resin previously molded and dissolve it in a 1: 1 solvent mixture of 1,1,1,3,3,3, -hexafluoro-2-propanol and chloroform. This was diluted with a 1: 1 solvent mixture of 1,1,1,3,3,3, -hexafluoro-2-propanol and chloroform to prepare a standard solution of a constant concentration series. The amount of resin (μg) adhering to the inner surface of the mold was determined from the determined calibration curve.

6). Appearance gloss evaluation of polyester bottles (1) Evaluation of appearance gloss of bottles by outermost surface roughness of mold 20 minutes after starting biaxial stretch blow molding, 20 bottles were extracted and Suga Test Instruments Co., Ltd. Haze Meter HGM- The haze value (cloudiness) of the bottle body was measured at 2K, and the following three-stage evaluation was performed.
○ Haze value (average value) less than 10% (good gloss).
Δ Haze value (average value) of 10 to less than 25% (gloss is slightly inferior but possible as a product).
X Haze value (average value) 25% or more (inferior glossiness).

(2) Evaluation of appearance gloss of bottle due to adhesion of polyester resin component to metal mold 20 bottles are taken out every 48 hours and 96 hours after the start of biaxial stretch blow molding, and the bottle body as in (1) above. The haze value (cloudiness) was measured, and the following four stages were evaluated in the same manner.
○: Haze value (average value) less than 10% (good glossiness).
Δ: Haze value (average value) of 10 to less than 25% (slightly inferior in gloss)
X: Haze value (average value) 25% to less than 35% (poor glossiness).
Xx: Haze value (average value) 35% or more (glossiness is very inferior).

[Example 1]
1. Preparation of a fluororesin-coated mold for biaxial stretch blow molding (1) Preparation of a mold As a metal base material, aluminum 7075-T651 material having a thermal conductivity of 110 [W / m · K] was cut and machined. A mold (two split molds) for biaxial stretching blow molding of a cylindrical polyester bottle for 65 mm, height excluding the mouth: 185 mm, and internal volume: 500 ml was prepared.

(2) Formation of heat insulation layer Heat insulation with an average thickness of 20 μm consisting of an electroless Ni—P alloy plating layer having a thermal conductivity of 6 [W / m · K] on the inner surface of the metal base of the above mold polished and finished. Layer 20 was formed.
Thereafter, the Ni—P alloy plating layer was buffed and precision finished.
Furthermore, the fine uneven | corrugated | grooved part 21 whose centerline average surface roughness Ra is set to 0.15 micrometer was formed in the Ni-P alloy plating layer by the blasting process.

(3) Formation of fluororesin layer The above mold is washed with alcohol, and an amorphous fluororesin “AF2400” (glass transition point 240 ° C.) manufactured by DuPont is added to a concentration of 0.6 weight percent in “FC77” manufactured by 3M. This solution was dissolved and sprayed onto the mold surface to form a fluororesin layer having an average thickness of 0.5 μm. The mold was baked for 6 hours in an electric furnace at 600 ° C. while cooling the aluminum mold base so that the temperature was 180 ° C. or less, and the fluororesin was heated and melted to form a fluororesin layer. Then, the Vickers hardness of the aluminum metal base material of the part in which the fluororesin layer, the contact | adherence layer, and the heat insulation layer are not formed was measured with the MVK-G3 type | mold micro hardness meter by Akashi Seisakusho.
In addition, when the center line average surface roughness of the surface of the fluororesin layer after heating and melting was measured with a Surfcom 570A type surface roughness meter manufactured by Tokyo Seimitsu Co., Ltd., Ra was 0.20 μm.

2. Preparation of polyester bottle by biaxial stretch blow molding After injection-molded polyester resin bottomed preform body (25 mm diameter, including mouth length 100 mm) is crystallized at a predetermined temperature, it is heated to 110 ° C. The polyester bottle is made by performing biaxial stretching blow molding in the fluororesin-coated mold, the strength of the fluororesin layer film, adhesion of the resin component of the mold after biaxial stretching blow molding, and the polyester bottle Appearance glossiness was evaluated.
The blow molding conditions at this time were a mold temperature of 150 ° C., a pre-blow pressure of 1 to 1.7 MPa, a blow pressure of 3.5 MPa, and the bottle draw ratio was an average of 2.7 in the longitudinal direction and an average of 3. in the circumferential direction. 5 was done.

[Example 2]
A metal mold similar to that of Example 1 was prepared using an aluminum 2024-T851 material having a thermal conductivity of 140 [W / m · K] as a metal substrate, and an Ni-P alloy having an average thickness of 10 μm as a heat insulating layer. A plating layer was formed, and fine concavo-convex portions 21 having a center line average surface roughness Ra of 0.10 μm were formed by blasting. After performing alkaline degreasing and acid cleaning, an adhesive film made of 0.03 μm metallic chromium and hydrated chromium oxide was formed by electrolytic chromate treatment.
Further, an amorphous fluororesin “AF2400” manufactured by DuPont was dissolved in “FC77” manufactured by 3M so as to have a concentration of 0.6% by weight, and this solution was spray-coated on the surface of the mold. A 5 μm fluororesin layer was formed.
The mold is baked in an electric furnace at 450 ° C. for 4 hours while the aluminum mold base is cooled to 150 ° C. or less, and the fluororesin is heated and melted to form a fluororesin layer. The Vickers hardness of the substrate was measured.
The center line average surface roughness Ra of the surface of the fluororesin layer after baking of this mold was 0.12 μm.
Using this mold, a polyester bottle was prepared in the same manner as in Example 1 and evaluated.

[Example 3]
As a metal substrate, aluminum 7075-T651 material having a thermal conductivity of 110 [W / m · K] is cut to create a mold similar to that in Example 1, and the surface of the metal substrate of the mold is polished. A sus316 film having a thermal conductivity of 3 [W / m · K] is formed on the finished inner surface by thermal spraying, and then polished and precision-finished. Further, by blasting, the centerline average surface roughness Ra is A heat-insulating layer having a thickness of 90 μm having fine uneven portions 21 having a thickness of 0.08 μm was formed.
Further, after performing alkaline degreasing cleaning and acid cleaning, an adhesive film made of 0.03 μm metallic chromium and hydrated chromium oxide was formed by electrolytic chromate treatment.
Thereafter, an amorphous fluororesin “AF2400” manufactured by DuPont is dissolved in “FC77” manufactured by 3M so as to have a concentration of 0.6% by weight, and this solution is spray-coated on the surface of the mold. A 5 μm fluororesin layer was formed. The mold was baked in an electric furnace at 450 ° C. for 2 hours while the aluminum mold base was cooled to 150 ° C. or lower, and the fluororesin was heated and melted to form a fluororesin layer. The Vickers hardness of the substrate was measured.
The centerline average surface roughness Ra of the surface of the fluororesin layer after baking of this mold was 0.10 μm.
Using this mold, a polyester bottle was prepared in the same manner as in Example 1 and evaluated.

[Comparative Example 1]
A mold was prepared using the same metal substrate as in Example 1, and the inner surface of this mold was buffed and finished so that the center line average surface roughness Ra was 0.04 μm. A polyester bottle was prepared in the same manner as in Example 1 using this mold.
In this comparative example, the amount of the resin component adhering to the mold after biaxial stretch blow molding was large, and the appearance gloss of the polyester bottle deteriorated with the lapse of time of biaxial stretch blow molding.

[Comparative Example 2]
In Example 1, a mold was prepared in the same manner except that the fluororesin layer was formed without forming the heat insulating layer, and a polyester bottle was prepared by performing biaxial stretching blow using this mold.
In this comparative example, when 100 polyester bottles were molded, the presence or absence of peeling of the fluororesin film was examined, and peeling was observed.

[Reference Example 1]
In Example 1, the mold was prepared in the same manner except that the fluororesin layer was formed by heating and melting by baking at a mold temperature of 320 ° C. for 30 minutes without cooling the aluminum metal substrate. And when the Vickers hardness of the aluminum metal base material after forming the fluororesin layer was measured, the hardness of the aluminum mold base material of this mold was greatly reduced.
From this result, it can be seen that at the time of baking the fluororesin layer, cooling of the metal base of the mold is effective in preventing softening of the metal base.

According to the method for producing a fluororesin-coated member of the present invention, it becomes possible to coat a fluororesin without causing softening of the metal base material, and it is possible to prevent dimensional changes of the fluororesin-coated member and scratches on the surface. it can.
In particular, when manufacturing polyester bottles, cups, and tray-like polyester containers, it is possible to prevent adhesion of resin and oligomer to the mold, less change in shape when leaving the mold, and gloss and transparency. It is possible to mold a resin container such as polyester having excellent properties.

It is sectional drawing which shows the cross-section of one Embodiment of the fluororesin coat member of this invention. It is an expanded sectional view of the fluororesin coat member of the present invention shown in FIG.

Explanation of symbols

1: Fluorine resin coated member 10: Metal substrate 20: Heat insulation layer 21: Fine uneven portion 30: Adhesive film 40: Fluorine resin layer

Claims (2)

When providing a heat insulating layer having a lower thermal conductivity than the metal base material on the metal base material, cooling the metal base material and providing a fluororesin layer by heating and melting the fluororesin on the heat insulating layer,
A method for producing a fluororesin-coated member, wherein the metal substrate is cooled at 180 ° C. or lower. The method for producing a fluororesin-coated member according to claim 1 , wherein the metal substrate is an aluminum substrate having a Vickers hardness Hv of 300 g and 90 or more.

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