WO2011077821A1 - Corps moulé renfermant une cavité, et procédé pour sa production - Google Patents

Corps moulé renfermant une cavité, et procédé pour sa production Download PDF

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Publication number
WO2011077821A1
WO2011077821A1 PCT/JP2010/068630 JP2010068630W WO2011077821A1 WO 2011077821 A1 WO2011077821 A1 WO 2011077821A1 JP 2010068630 W JP2010068630 W JP 2010068630W WO 2011077821 A1 WO2011077821 A1 WO 2011077821A1
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WIPO (PCT)
Prior art keywords
parison
cavity
acid
stretching
molded body
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PCT/JP2010/068630
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English (en)
Japanese (ja)
Inventor
清一 渡辺
徹 小倉
伸輔 高橋
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富士フイルム株式会社
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Publication of WO2011077821A1 publication Critical patent/WO2011077821A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/786—Temperature
    • B29C2049/7861—Temperature of the preform
    • B29C2049/7862—Temperature of the preform characterised by temperature values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • B29C2949/0762—Conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • B29C2949/0767—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape the shape allowing stacking or nesting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/0769—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the lip, i.e. very top of preform neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0776—Closure retaining means not containing threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods

Definitions

  • the present invention relates to a molded body containing a cavity inside and a manufacturing method thereof.
  • a cold parison method in which a parison (preform) molded into a shape having a bottom of a test tube by injection molding is once cooled to room temperature, reheated by a blow molding apparatus, temperature-controlled, and blow molded.
  • a hot parison system in which the molded parison is transferred to a temperature adjustment step without being completely cooled, and then blow-molded (see, for example, Patent Document 1).
  • the hot parison system is also referred to as a one-stage system because parison molding and blow molding are continuously performed by the same molding machine.
  • the cold parison method is also referred to as a two-stage type because parison molding and blow molding are performed by different molding machines.
  • a bottomed cylindrical parison 10 that has been molded in advance is set in the blow molding apparatus 1 (FIG. 1A), and then a mold 20a, The molded body 30 is manufactured by superimposing and heating 20b, supplying air from above, and causing the parison 10 to follow the inner surface shape of the mold 20 (FIG. 1B).
  • the parison 10 is extruded in a molten state in a tube shape (FIG.
  • the blow molding also includes stretch blow molding in which stretching is performed.
  • stretch blow molding in which stretching is performed.
  • methods shown in FIGS. 3A to 3D have been proposed as cold parison type stretch blow molding methods.
  • the parison 10 already made using an injection molding machine is heated to a predetermined temperature by passing between the heating devices 31. At this time, in order to uniformly heat the parison 10, it is generally performed to rotate the parison passing between the heating devices 31 (FIG. 3A).
  • the temperature-controlled parison 10 is set in the molds 20a and 20b and stretched by a support member (also referred to as a stretch rod) 32 (FIG. 3B).
  • the molded body produced by such blow molding is excellent in transparency, impact resistance, hygiene, gas barrier properties, pressure resistance, etc., and for this reason, packaging of various foods, beverages, detergents, cosmetics, etc. It is widely used as a container for use (see, for example, Patent Document 4).
  • a high-temperature or low-temperature substance may be charged or injected into the packaging container, and it is desired to improve the heat insulation of the packaging container.
  • reflecting the sunlight from outside the container is becoming an important requirement for the container from the viewpoint of protecting the contents.
  • the present condition is that the molded object which can exhibit such a function alone, is excellent in mold maintenance and heat insulation, has high brightness, and has a uniform bright surface is not yet provided. .
  • an object of the present invention is to provide a molded article that is excellent in molding maintainability and heat insulation, has high brightness, and has a uniform bright surface, and contains a cavity, and a method for producing the same. .
  • Means for solving the problems are as follows. That is, ⁇ 1> A molding process for forming a parison and manufacturing a molded body, The forming step is a drawing process for drawing a heated parison; A blow treatment for blowing the stretched parison, The parison has an opening and a bottom, and is provided with a neck starting point, and is a method for producing a molded body containing a cavity inside. ⁇ 2> The method for producing a molded article containing cavities in the interior according to ⁇ 1>, wherein the stretching in the stretching treatment is necking stretching.
  • Tg represents the glass transition temperature of resin of a parison.
  • ⁇ 5> The method for producing a molded body in which the thin-walled portion contains a cavity in the interior according to ⁇ 4>, wherein the thin-walled portion is provided symmetrically with respect to the stretching axis of the parison.
  • ⁇ 6> A molded article containing a cavity inside, wherein the molded article is produced by the method for producing a molded article containing a cavity inside according to any one of ⁇ 1> to ⁇ 5>.
  • ⁇ 7> The molded body containing a cavity in the interior according to ⁇ 6>, wherein the light transmittance of at least a part of the molded body with respect to light having a wavelength of 550 nm is less than 70%.
  • FIG. 1A is a diagram for explaining a cold parison system in blow molding (part 1).
  • FIG. 1B is a diagram for explaining a cold parison method in blow molding (part 2).
  • FIG. 2A is a diagram for explaining a hot parison system in blow molding (part 1).
  • FIG. 2B is a diagram for explaining a hot parison system in blow molding (part 2).
  • FIG. 3: A is a figure for demonstrating the cold parison system in stretch blow molding (the 1).
  • FIG. 3B is a diagram for explaining a cold parison system in stretch blow molding (part 2).
  • FIG. 3C is a view for explaining a cold parison system in stretch blow molding (part 3).
  • FIG. 1A is a diagram for explaining a cold parison system in blow molding (part 1).
  • FIG. 1B is a diagram for explaining a cold parison method in blow molding (part 2).
  • FIG. 2A is a diagram for explaining a hot parison
  • FIG. 3D is a view for explaining a cold parison method in stretch blow molding (part 4).
  • FIG. 4 is a schematic cross-sectional view for explaining an example of the shape of a parison.
  • FIG. 5 is a schematic cross-sectional view for explaining another example of the shape of the parison.
  • FIG. 6 is a diagram for explaining necking.
  • FIG. 7 is a schematic diagram of necking and load-elongation curves in a film.
  • FIG. 8 is a diagram for explaining an example of the stretching process.
  • FIG. 9 is a schematic cross-sectional view for explaining the shape of the parison used in Comparative Example 3.
  • the molded product containing cavities in the present invention can be preferably produced by the method for producing a molded product containing cavities in the present invention.
  • the manufacturing method of the molded object which contains a cavity in the inside of this invention includes at least a molding step, and further includes other steps as necessary.
  • the molding step includes at least a stretching process and a blowing process, and further includes other processes as necessary.
  • a parison is molded, and a molded body containing a cavity inside is manufactured.
  • the stretching process is a process of stretching a heated parison. By the stretching treatment, a cavity is formed in at least a part of the stretched parison.
  • the parison has an opening and a bottom, and is provided with a neck starting point.
  • the parison includes at least one of a crystalline polymer and a fine particle-containing polymer, and further includes other components as necessary.
  • the parison is manufactured by cooling the parison and forming cavity-origin particles inside the parison.
  • the parison is made of a crystalline polymer, the parison is crystallized by the cooling to form microcrystals inside the parison, and the microcrystals become cavity starting particles.
  • the parison is made of a fine particle-containing polymer, the fine particles in the fine particle-containing polymer become cavity starting particles.
  • -Crystalline polymer- In general, polymers are classified into crystalline polymers and amorphous (amorphous) polymers, but even crystalline polymers are not 100% crystalline, and long chain molecules are regularly formed in the molecular structure. It includes aligned crystalline regions and non-regularly arranged amorphous (amorphous) regions. Therefore, the crystalline polymer only needs to include at least the crystalline region in the molecular structure, and the crystalline region and the amorphous region may be mixed.
  • polyolefin for example, low density polyethylene, high density polyethylene, polypropylene, etc.
  • PA polyamides
  • POM polyacetals
  • polyesters eg, PET, PEN, PTT, PBT, PPT, PHT, PBN, PES, PBS, etc.
  • SPS syndiotactic polystyrene
  • PPS polyphenylene sulfide
  • PEEK polyether ether ketones
  • polyolefins polyolefins
  • polyesters syndiotactic polystyrene (SPS) and liquid crystal polymers (LCP) are preferable from the viewpoint of durability, mechanical strength, production and cost, and polyolefins (PP, PE, etc.), polyesters Are more preferred, and PET is particularly preferred. Two or more kinds of these polymers may be blended or copolymerized.
  • the crystalline polymer has a functional group having high absorption in the ultraviolet region such as an aromatic ring. It is preferably not included. Therefore, aliphatic polyester is preferable among the polyesters.
  • the melt viscosity of the crystalline polymer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 50 Pa ⁇ s to 700 Pa ⁇ s, more preferably 70 Pa ⁇ s to 500 Pa ⁇ s, and more preferably 80 Pa ⁇ s. Particularly preferred is s to 300 Pa ⁇ s.
  • the melt viscosity of 50 Pa ⁇ s to 700 Pa ⁇ s is preferable in that the properties of the polymer discharged from an extruder or a molding apparatus during melting are stabilized. Further, the melt viscosity of 50 Pa ⁇ s to 700 Pa ⁇ s is preferable in that the viscosity at the time of melting becomes appropriate and the extrusion becomes easy.
  • melt viscosity can be measured by a plate type rheometer (for example, Physica MCR301: manufactured by Anton Paar) or a capillary rheometer (for example, flow tester CFT-500D: manufactured by Shimadzu Corporation).
  • a plate type rheometer for example, Physica MCR301: manufactured by Anton Paar
  • a capillary rheometer for example, flow tester CFT-500D: manufactured by Shimadzu Corporation.
  • the intrinsic viscosity (IV) of the crystalline polymer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.4 to 1.5, more preferably 0.6 to 1.4. 0.7 to 1.3 is particularly preferable.
  • the IV is 0.4 to 1.5, the strength of the molded product containing cavities in the interior is increased, and this is preferable in terms of efficient stretching.
  • the IV can be measured by an Ubbelohde viscometer.
  • the melting point (Tm) of the crystalline polymer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 40 ° C to 350 ° C, more preferably 100 ° C to 300 ° C, and more preferably 100 ° C to 260 ° C. ° C is particularly preferred.
  • the melting point of 40 ° C. to 350 ° C. is preferable in that the shape can be easily maintained in the temperature range expected for normal use.
  • the melting point can be measured by a differential thermal analyzer (DSC).
  • the content of the crystalline polymer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 80% by mass to 99.5% by mass, and 85% by mass to 99% by mass with respect to the parison. % Is more preferable, and 90% by mass to 98% by mass is particularly preferable.
  • the content of the crystalline polymer is less than 80% by mass with respect to the parison, it may be difficult to maintain the shape during processing and handling of the parison.
  • the content exceeds 99.5% by mass, the parison May become brittle.
  • polyester resins mean a general term for polymer compounds having an ester bond as a main bond chain. Therefore, as the polyester resin suitable as the crystalline polymer, the exemplified PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PTT (polytrimethylene terephthalate), PBT (polybutylene terephthalate), PPT (polypenta).
  • the dicarboxylic acid component is not particularly limited and may be appropriately selected depending on the intended purpose.
  • aromatic dicarboxylic acid aliphatic dicarboxylic acid, alicyclic dicarboxylic acid, oxycarboxylic acid, polyfunctional acid, etc. Is mentioned.
  • the aromatic dicarboxylic acid is not particularly limited and may be appropriately selected depending on the intended purpose.
  • terephthalic acid, isophthalic acid, diphenyldicarboxylic acid, and naphthalenedicarboxylic acid are preferable, and terephthalic acid, diphenyldicarboxylic acid, and naphthalenedicarboxylic acid are more preferable.
  • the aliphatic dicarboxylic acid is not particularly limited and may be appropriately selected depending on the intended purpose.
  • cyclohexane dicarboxylic acid etc. are mentioned.
  • the oxycarboxylic acid is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include p-oxybenzoic acid.
  • polyfunctional acid there is no restriction
  • succinic acid in that the molded product containing a cavity inside has a low transmittance (excellent reflection characteristics) in a wide wavelength range including the ultraviolet region, Adipic acid and cyclohexanedicarboxylic acid are preferable, and succinic acid and adipic acid are more preferable.
  • the diol component is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include aliphatic diols, alicyclic diols, aromatic diols, diethylene glycol, and polyalkylene glycols. Among these, aliphatic diols are preferable in that the molded body containing cavities therein has low transmittance (excellent reflection characteristics) in a wide wavelength range including the ultraviolet region.
  • the aliphatic diol is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentyl glycol, and triethylene glycol. Can be mentioned. Of these, propanediol, butanediol, pentanediol, and hexanediol are preferable.
  • propanediol, butanediol, pentanediol, and hexanediol are preferable.
  • limiting in particular as said alicyclic diol According to the objective, it can select suitably, For example, cyclohexane dimethanol etc. are mentioned.
  • aromatic diol According to the objective, it can select suitably, For example, bisphenol A, bisphenol S, etc. are mentioned.
  • the melt viscosity of the polyester resin is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 50 Pa ⁇ s to 700 Pa ⁇ s, more preferably 70 Pa ⁇ s to 500 Pa ⁇ s, and more preferably 80 Pa ⁇ s. ⁇ 300 Pa ⁇ s is particularly preferred.
  • the melt viscosity is higher, voids are more likely to occur during stretching, but when the melt viscosity is 50 Pa ⁇ s to 700 Pa ⁇ s, molding becomes easier and the resin flow becomes stable and retention is less likely to occur. It is preferable in that the quality is stabilized.
  • the melt viscosity of 50 Pa ⁇ s to 700 Pa ⁇ s is preferable in that the drawing tension is appropriately maintained at the time of drawing, and it becomes easy to draw uniformly and is difficult to break. Further, when the melt viscosity is 50 Pa ⁇ s to 700 Pa ⁇ s or more, it becomes easy to maintain the form of the discharged material discharged from the die head, and it can be stably molded, and the product is not easily damaged. , Which is preferable in terms of enhancing physical properties.
  • the intrinsic viscosity (IV) of the polyester resin is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.4 to 1.5, more preferably 0.6 to 1.3, Particularly preferred is 0.7 to 1.2. If the IV is larger, voids are more likely to be generated during stretching. However, if the IV is 0.4 to 1.5, molding becomes easier and the resin flow is more stable, and it is difficult for stagnation to occur. Is preferable in that it is stabilized. Further, when the IV is 0.4 to 1.5, the stretching tension is appropriately maintained at the time of stretching, so that it is easy to stretch uniformly and it is preferable in that the load is not easily applied to the apparatus. In addition, when the IV is 0.4 to 1.5, it is preferable in that the product is hardly damaged and the physical properties are increased.
  • the melting point of the polyester resin is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 70 ° C. to 300 ° C., more preferably 90 ° C. to 270 ° C. from the viewpoint of heat resistance.
  • the said dicarboxylic acid component and the said diol component may respectively superpose
  • a polymer may be formed by copolymerization.
  • two or more kinds of polymers may be blended and used.
  • the polymer added to the main polymer has a melt viscosity and an intrinsic viscosity that are close to those of the main polymer, and the addition amount is smaller, and the physical properties at the time of melt extrusion are smaller. It is preferable in terms of increasing and facilitating extrusion.
  • a resin other than polyester may be added to the polyester resin.
  • the fine particle-containing polymer is not particularly limited as long as it contains fine particles, and can be appropriately selected according to the purpose.
  • Fine particles-- The fine particles are not particularly limited as long as they can serve as cavity starting particles, and can be appropriately selected according to the purpose.
  • examples thereof include fillers and resin fine particles.
  • the filler is not particularly limited and may be appropriately selected depending on the intended purpose.
  • examples thereof include organic fillers such as salts, hydroxystearic acid amide, and ricinoleic acid amide, inorganic fillers such as talc, silica, kaolin, clay, smectite, and vermiculite.
  • the resin fine particles are not particularly limited as long as they are incompatible with the fine particle-containing polymer, and can be appropriately selected according to the purpose. Examples thereof include PTFE (polytetrafluoroethylene).
  • the content of the fine particles is not particularly limited and may be appropriately selected depending on the intended purpose. It is preferably 0.05% by mass to 5% by mass and preferably 0.1% by mass to 2% by mass with respect to the parison. % Is more preferable, and 0.2% by mass to 0.5% by mass is particularly preferable. If the content of the fine particles is less than 0.05% with respect to the parison, sufficient crystallization may not be promoted, and if it exceeds 5 mass%, the parison may become brittle.
  • the volume average particle diameter of the fine particles is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01 ⁇ m to 10 ⁇ m, more preferably 0.02 ⁇ m to 5 ⁇ m, and more preferably 0.05 ⁇ m to 1 ⁇ m. Particularly preferred. If the volume average particle size of the fine particles is less than 0.01 ⁇ m, sufficient crystallization may not be promoted, and if it exceeds 10 ⁇ m, the parison may become brittle.
  • Crystal nucleating agent-- The crystal nucleating agent is not particularly limited as long as it promotes microcrystal formation inside the crystalline polymer, and can be appropriately selected according to the purpose. i) simple substances, metal compounds including complex oxides, (ii) low molecular compounds having a metal salt of a carboxyl group, (iii) high molecular organic compounds, (iv) phosphoric acid, phosphorous acid, or metal salts thereof ( v) sorbitol derivatives, (vi) quaternary ammonium compounds, (vii) other compounds, and the like. Moreover, the said crystal nucleating agent may use 1 type or 2 types or more simultaneously.
  • the metal compound containing (i) simple substance and complex oxide is not particularly limited and may be appropriately selected depending on the purpose.
  • calcium carbonate, synthetic silicic acid and silicate, silica, zinc white high examples include cytoclay, kaolin, basic magnesium carbonate, mica, talc, quartz powder, diatomaceous earth, dolomite powder, titanium oxide, zinc oxide, antimony oxide, barium sulfate, calcium sulfate, alumina, calcium silicate, and boron nitride.
  • Examples of the low molecular compound having a metal salt of (ii) carboxyl group include octylic acid, toluic acid, heptanoic acid, pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, serotic acid, montanic acid, Melicic acid, benzoic acid, p-tert-butylbenzoic acid, terephthalic acid, terephthalic acid monomethyl ester, isophthalic acid, isophthalic acid monomethyl ester, camphoric acid, citronellic acid, hinokiic acid, abitienic acid, rosin acid, hydrogenated rosin acid, etc.
  • the metal salt is mentioned.
  • the (iii) polymer organic compound is not particularly limited and may be appropriately selected depending on the intended purpose.
  • 3,3-dimethylbutene-1, 3-methylpentene-1, 3-methylbutene-1 , 3-methylhexene-1, 3,5,5-trimethylhexene-1, etc. and 3-position branched ⁇ -olefins having 5 or more carbon atoms
  • vinylcycloalkanes such as vinylcyclopentane, vinylcyclohexane, and vinylnorbornane.
  • polyalkylene glycols such as polyethylene glycol and polypropylene glycol, polyglycolic acid, cellulose, cellulose ester, cellulose ether, polyvinyl alcohol, chitin, chitosan, nylon 6, nylon 66, nylon 610, nylon 612 and other aliphatic polyamides Compound, tele Wholly aromatic polyester fine powder to the barrel acid and resorcinol as main constitutional units, polyhydroxyalkanoates, and the like.
  • the (iv) phosphoric acid, phosphorous acid, or a metal salt thereof is not particularly limited and may be appropriately selected depending on the intended purpose.
  • diphenyl phosphate diphenyl phosphite, bis (4-tert-butyl phosphate) Phenyl) sodium, methylene phosphate (2,4-tert-butylphenyl) sodium, and the like.
  • the (v) sorbitol derivative is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include bis (p-methylbenzylidene) sorbitol and bis (p-ethylbenzylidene) sorbitol.
  • the (vi) quaternary ammonium compound is not particularly limited and may be appropriately selected depending on the intended purpose.
  • Examples thereof include tetraethylammonium chloride, tetran-propylammonium chloride, tetran-butylammonium chloride, tetraethylammonium bromide. Tetra n-propylammonium bromide, tetra n-butylammonium bromide, tetraethylammonium silicate, tetra n-butylammonium silicate, and the like.
  • the (vii) other compound is not particularly limited and may be appropriately selected depending on the intended purpose.
  • crystal nucleating agent examples thereof include thioglycolic anhydride, p-toluenesulfonic acid, and metal salts thereof, dibasic acid bis (benzoic acid) Acid hydrazide) compounds, isocyanurate compounds, compounds having a barbituric acid structure, and the like.
  • the content of the crystal nucleating agent is not particularly limited and may be appropriately selected depending on the intended purpose. It is preferably 0.01% by mass to 15% by mass with respect to the parison, and 0.05% by mass. Is more preferably 10% by mass, and particularly preferably 0.1% by mass to 3% by mass.
  • the volume average particle size of the crystal nucleating agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01 ⁇ m to 20 ⁇ m, more preferably 0.1 ⁇ m to 10 ⁇ m, and more preferably 0.2 ⁇ m. Particularly preferred is ⁇ 3 ⁇ m. If the volume average particle size of the crystal nucleating agent is less than 0.01 ⁇ m, the effect may not be sufficiently obtained, and if it exceeds 20 ⁇ m, the parison may become brittle.
  • cooling temperature there is no restriction
  • the cooling rate is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5 ° C / sec to 200 ° C / sec, more preferably 10 ° C / sec to 100 ° C / sec, It is particularly preferably from °C / sec to 60 °C / sec.
  • the cooling rate is less than 5 ° C./sec, crystallization may proceed excessively, and when it exceeds 200 ° C./sec, crystallization may be insufficient.
  • the shape of the parison is not particularly limited as long as it has an opening and a bottom and a neck starting portion is provided, and can be appropriately selected according to the purpose. Shape, tube shape, and the like.
  • molding method of the said parison According to the objective, it can select suitably, For example, extrusion molding, injection molding, etc. are mentioned.
  • molding of the said parison According to the objective, it can select suitably, For example, a horizontal hydraulic injection molding apparatus, a vertical electric injection molding apparatus, etc. are mentioned.
  • the neck starting portion refers to a portion that becomes a starting point of necking stretching described later.
  • the neck starting portion is not particularly limited and can be appropriately selected according to the purpose.For example, a thin portion provided near the bottom of the cup-shaped preform, the center of the side, the vicinity of the opening, etc. Is mentioned. Among these, it is preferable that the thin-walled portion of the parison is provided symmetrically with respect to the stretching axis of the parison, because voids are easily generated uniformly. Further, the necking start position may be adjusted by making the temperature of the preform at the neck starting portion higher than that at other portions, or by making the thickness of the preform at the neck starting portion thinner than other portions.
  • FIG. 4 is a cross-sectional view in a direction parallel to the extending direction of the parison 10.
  • the parison 10 has an opening 42 and a bottom 43, and is provided with a neck starting point.
  • the neck starting point portion is a thin wall portion in the parison, and is provided symmetrically with respect to the stretching axis 41 of the parison.
  • reference numeral 44 indicates a side portion
  • reference numeral 45 indicates a portion that is gripped by the pressing metal (hereinafter, may be referred to as “gripping portion”).
  • FIG. 5 is a cross-sectional view in a direction parallel to the extending direction of the parison 10.
  • the parison 10 has an opening 42 and a bottom 43, and is provided with a neck starting point.
  • the neck starting point portion is a thin wall portion in the parison, and is provided symmetrically with respect to the stretching axis 41 of the parison.
  • reference numeral 44 indicates a side portion
  • reference numeral 45 indicates a portion that is gripped by the presser fitting (hereinafter may be referred to as “gripping portion”).
  • a neck starting point portion is provided by making a notch (a portion where the thickness of the preform suddenly decreases) in the side portion 44 of the parison.
  • the neck starting point may be a notch or a relatively long thin region.
  • region Although it can select suitably according to the objective, 50 mm or less is preferable, 30 mm or less is more preferable, and 15 mm or less is especially preferable.
  • the length of the thin region exceeds 50 mm, the stretching start point becomes uneven in the outer peripheral direction, and unevenness may occur in the formation of the cavity.
  • the length of the thin-walled region is within the particularly preferable range, it is advantageous in terms of uniform cavity formation and stable production of a molded shape.
  • the thickness of the thin portion is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 99% to 50% with respect to the thickness of the side portion 44 of the parison, and 95 % To 70% is more preferable, and 95% to 80% is particularly preferable. If the thickness of the thin portion is less than 50% of the side of the parison, the parison may tear from the notch portion during stretching, and if it exceeds 99%, stretching starts from a portion other than the notch and is uniform. May not be generated. On the other hand, when the thickness of the thin-walled portion is within the particularly preferable range, it is advantageous in that it is stretched and blown with a uniform thickness on the whole, and unevenness in void expression is reduced. Although the starting point of necking can be stably generated even with a notch, it is possible to stably develop necking stretching from a relatively long thin region by heating the preform with high accuracy.
  • the thickness of the side portion is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 100 ⁇ m to 1 mm, more preferably 200 ⁇ m to 800 ⁇ m, and particularly preferably 300 ⁇ m to 500 ⁇ m.
  • the side portion has a thickness of less than 100 ⁇ m, in the case of generation of voids starting from microcrystals, the microcrystal size is too small, so that the voids may not be sufficiently developed, and particles are added. Even in the method, the crystallization of the resin does not proceed sufficiently, and it is difficult for the discontinuation of the interface to peel off. May become hard and brittle, making stretching blow difficult.
  • the thickness of the side portion is within the particularly preferable range, it is advantageous in that stretch blow is easily performed and unevenness of voids is reduced.
  • the thickness of the bottom is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 2 mm to 5 mm, more preferably 2 mm to 4 mm, and particularly preferably 2 mm to 3 mm. If the thickness of the bottom is less than 2 mm, the bottom may be broken at the time of stretching, and if it exceeds 5 mm, the amount of resin used increases, resulting in additional transportation costs, resin material costs, etc. Is also not preferred. On the other hand, if the thickness of the bottom is within the particularly preferred range, it is advantageous in that it does not break even when pressed by a stretching rod, and waste of resin can be suppressed to a minimum.
  • the thickness of the grip portion is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 mm to 2 mm, more preferably 0.5 mm to 1.5 mm, and 0.7 mm to 1.mm. 0 mm is particularly preferable. If the thickness of the gripping part is less than 0.5 mm, it may not be able to be gripped sufficiently when mounted on a mold and gripped, and it may slip off at the time of stretch blow or break at a corner part. If it exceeds, the amount of resin used increases, which is not economically preferable, such as transportation costs and resin material costs. On the other hand, when the thickness of the grip portion is within the particularly preferable range, even if the amount of resin used is small, a lightweight and durable molded body is obtained, which is advantageous in terms of economy.
  • the heating temperature (Tp) of the parison is not particularly limited and may be appropriately selected according to the purpose.
  • Tg glass transition temperature of the parison resin
  • Tg-30 ° C. ⁇ Tp ⁇ (Tg + 70) ° C.
  • formula (1) is preferable
  • Tg ⁇ 30 ° C. ⁇ Tp ⁇ (Tg + 60) ° C.
  • Tg ⁇ 30 ° C. ⁇ Tp ⁇ (Tg + 40) ° C. is particularly preferable.
  • the heating temperature (Tp) of the parison is less than (Tg-30) ° C., the parison may not be fully stretched, and if it exceeds (Tg + 70) ° C., voids may not be stably formed.
  • the heating temperature (Tp) of the parison is within the particularly preferable range, it is advantageous in that uniform voids are generated in the container by stretch blow.
  • a far-infrared heater, a quartz heater, a hot air generator, a carbon dioxide laser, etc. are mentioned.
  • the stretching is not particularly limited as long as a cavity is formed in at least a part of the stretched parison, and can be appropriately selected according to the purpose, but necking stretching is possible in that the cavity can be stably formed. Is preferred.
  • the stretching is performed by, for example, necking stretching a parison formed by injection molding with a support member and stretching the parison in which the cavity starting particles are formed, thereby forming a cavity inside the parison.
  • necking stretching There is no restriction
  • necking stretching-- The necking stretching refers to stretching so that “necking” occurs when the parison is stretched.
  • the necking is defined as follows in “Introduction to Polymers” (December 20, 1982, 9th printing, Masamichi Katayama Nikkan Kogyo Shimbun). “When various film-like or fiber-like polymers are pulled at room temperature, there are those that can“ neck ”as shown in FIG. This “constricted part” moves in the direction of the hand while it is stretched. The cross-sectional area of the “necked portion” is constant, and is clearly distinguished from the unstretched portion by a shoulder-like portion (shoulder).
  • FIG. 7 is a schematic diagram of the necking and load-elongation curve in the film.
  • the reason why the cavity is formed inside the parison by the necking stretching is considered to be that the parison is finely broken inside the parison due to necking stretching, and this serves as a cavity forming source to form a cavity.
  • the stretching speed of the parison in the stretching process is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 10 mm / min to 40,000 mm / min, more preferably 500 mm / min to 20,000 mm / min. More preferred is 1,000 mm / min to 10,000 mm / min. If the stretching speed is less than 10 mm / min, voids may not be formed, and if it exceeds 40,000 mm / min, the parison may be easily broken during stretching.
  • the stretching can be performed, for example, as shown in FIG. That is, it can be performed by holding the parison 10 with the presser fitting 81, using a stretch rod as the support member 82, and extending the parison in the direction of the arrow.
  • the blow process is a process of blowing the stretched parison.
  • the molded body is processed into a desired shape by the blowing process.
  • the blow process is not particularly limited as long as the gas is supplied to the hollow part of the parison, and can be appropriately selected according to the purpose.For example, extrusion blow process, injection blow process, stretch blow process, multilayer blow process, Multidimensional blow processing, etc. are mentioned.
  • the stretch blow process is to supply gas after the parison is stretched. By the blowing process, the molded body in which the cavity is formed by the stretching process is expanded to give a desired shape.
  • limiting in particular as said gas used for a blow process According to the objective, it can select suitably, For example, air, nitrogen, etc. are mentioned.
  • the gas supply pressure is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.2 Mpa to 20 Mpa, more preferably 0.4 Mpa to 10 Mpa, and particularly preferably 0.5 Mpa to 5 Mpa. . If the gas supply pressure is less than 0.2 Mpa, blow may not be possible at a sufficient speed, and if it exceeds 20 Mpa, the parison may break during blowing.
  • the plane stretching ratio (longitudinal stretching ratio ⁇ lateral stretching ratio) of the parison in the blow treatment is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5 to 100 times, and 10 to 50 times. Is more preferably 15 times to 30 times. If the plane stretch ratio is less than 5 times, uneven thickness of the parison may not be eliminated, and if it exceeds 100 times, the parison may be easily broken during blowing.
  • the transfer process is a process of blow molding a parison in a mold and transferring the inner surface shape of the mold to the parison.
  • the said transfer process is performed by the blow process same as the blow process of the said formation process.
  • the mold is not particularly limited as long as it has an inner surface, and can be appropriately selected according to the purpose. Examples thereof include a mold 20 shown in FIGS. 1A to 2B.
  • the transfer is performed by supplying gas and bringing the parison into close contact (following) with the inner surface of the mold.
  • gas There is no restriction
  • the gas supply pressure is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.2 Mpa to 20 Mpa, more preferably 0.4 Mpa to 10 Mpa, and particularly preferably 0.5 Mpa to 5 Mpa. .
  • the gas supply pressure is less than 0.2 Mpa, the parison may not adhere (follow) the inner surface of the mold, and when it exceeds 20 Mpa, the parison may burst without being uniformly stretched.
  • the temperature of the mold is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably a parison softening point to (melting point + 60 ° C.), more preferably a softening point to (melting point + 50 ° C.), A softening point to a melting point are particularly preferred.
  • the temperature of the mold is lower than the softening point of the parison, the parison may not adhere (follow) to the inner surface of the mold, and when the temperature exceeds the (melting point + 60 ° C.) of the parison, It may not be maintained.
  • the heat treatment is a treatment for heating the parison in the mold.
  • the heating can be performed by a heating mechanism or the like provided in the mold.
  • the heating temperature in the heat treatment is not particularly limited and may be appropriately selected depending on the intended purpose.
  • the glass transition temperature of the parison to (melting point + 60) ° C. is preferable, and the glass transition temperature to (melting point + 30) ° C.
  • a glass transition temperature to (melting point + 20) ° C. is particularly preferable.
  • the rate of temperature increase in the heat treatment is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 ° C / min to 300 ° C / min, more preferably 2 ° C / min to 250 ° C / min. 5 ° C./min to 200 ° C./min is particularly preferable.
  • the molded body containing a cavity in the inside can be produced by the method for producing a molded body containing a cavity inside the present invention.
  • the side surface, bottom face, etc. of a container are mentioned.
  • the side surface of the container is preferable in terms of expressing a uniform cavity.
  • the fact that the molded body contains cavities can be confirmed, for example, by embedding a sample with a resin, cutting out a cut surface with a microtome, and using an electron microscope or the like.
  • the light transmittance of at least a part of the molded body is not particularly limited and may be appropriately selected depending on the intended purpose.
  • the light transmittance with respect to light having a wavelength of 550 nm is preferably less than 70%, and 50% or less. Is more preferable, and 40% or less is particularly preferable.
  • the light transmittance is 70% or more, the physical properties of the cavity-containing container may not be sufficiently exhibited.
  • the light transmittance is within the particularly preferable range, it is advantageous in that the physical properties of the cavity-containing container can be sufficiently exhibited.
  • the light transmittance can be measured with, for example, a spectrophotometer (U-4100, manufactured by Hitachi, Ltd.).
  • the light transmittance may be a light transmittance of a part of the molded body containing the cavity inside, or may be a total light transmittance.
  • the parison was set in a mold of a biaxial blow stretching apparatus. After deformation in the depth direction of the container with a stretch rod (stretching treatment: necking stretching), by introducing compressed air (blowing treatment), molding was performed in close contact with the inner surface of the mold.
  • the temperature setting of the parison was 90 ° C.
  • the speed of the stretch rod was 800 mm / sec
  • the final draw ratio was 4.3 times.
  • the shape was imparted by closely contacting the mold by introducing 1.5 Mpa of compressed air 15 mm before the bottom of the container (the bottom of the parison) reached the mold by expansion and contraction of the stretch rod. Thereafter, the molded body was solidified and cooled to 70 ° C.
  • Example 2 In the production of the parison of Example 1, a container with a capacity of 500 mL was produced in the same manner as in Example 1 except that the shape of the parison was changed to the shape of FIG. -Parison shape- Shape: Fig. 5
  • Neck start point position Height 8mm from the opening (axisymmetric with respect to the stretching axis)
  • Neck origin thickness 0.5mm Width of opening: 62mm
  • Side thickness 1.5mm
  • Side length 15mm
  • Bottom thickness 2mm
  • Bottom width 30mm
  • Gripping part thickness 3mm
  • Example 2 the cavity starting particles were formed when the parison was cooled, and it was confirmed that the parison subjected to the stretching treatment had a cavity formed therein. Moreover, the formation position of the cavity in the container after the molding process was the same as that in Example 1.
  • Example 3 In the molding process of Example 1, the point where the temperature setting of the parison was 90 ° C. was changed to 40 ° C., and a container having a capacity of 500 mL was produced in the same manner as Example 1 except that the cooling treatment was not performed. . The formation position of the cavity in the container produced in Example 3 was the same as in Example 1.
  • Example 4 A container with a capacity of 500 mL was produced in the same manner as in Example 1 except that the temperature setting of the parison was 90 ° C. in the molding step of Example 1 was changed to 130 ° C. The formation position of the cavity in the container produced in Example 4 was the same as in Example 1.
  • Example 5 A container with a capacity of 500 mL was produced in the same manner as in Example 1, except that the temperature setting of the parison was 90 ° C. in the molding step of Example 1 was changed to 150 ° C. The formation position of the cavity in the container produced in Example 5 was the same as in Example 1.
  • Example 6 In the molding step of Example 1, the point where the temperature setting of the parison was 90 ° C. was changed to 25 ° C., and a container having a capacity of 500 mL was produced in the same manner as in Example 1 except that the cooling treatment was not performed. . The formation position of the cavity in the container produced in Example 6 was the same as in Example 1.
  • Comparative Example 1 A container having a capacity of 500 mL was produced in the same manner as in Example 1 except that the stretching process was not performed in the molding step of Example 1. In Comparative Example 1, the cavity starting particles were formed when the parison was cooled, but no cavity was formed in the container after the molding process.
  • Comparative Example 2 In the molding step of Example 2, a container having a capacity of 500 mL was produced in the same manner as Example 2 except that the stretching treatment was not performed. In Comparative Example 2, the cavity starting particles were formed when the parison was cooled, but the cavity was not formed in the container after the molding process.
  • Example 1 a container having a capacity of 500 mL was produced in the same manner as in Example 1 except that the stretching process was not performed and the temperature setting of the parison was 90 ° C., which was 180 ° C.
  • Comparative Example 3 the cavity starting particles were formed when the parison was cooled, but the cavity was not formed in the container after the molding process.
  • the temperature setting of the parison was set to 90 ° C. as in Example 1, the parison could not be stretched and a container could not be produced.
  • ⁇ High brightness evaluation> A relatively flat portion centered at a height of 10 cm from the bottom of the container on the side surface of the container obtained in Examples 1 to 6 and Comparative Examples 1 to 3 was cut into a 2 cm ⁇ 2 cm rectangle, and this sample was cut. The light transmittance at a wavelength of 550 nm was measured.
  • the evaluation criteria were as follows. -Evaluation criteria- A: Light transmittance is less than 50%. ⁇ : The light transmittance is 50% or more and less than 60%. ⁇ : Light transmittance is 60% or more and less than 70%. X: Light transmittance is 70% or more.
  • -Evaluation criteria- Double-circle: The uniform luminescent surface is formed in the whole cavity formation position of a container.
  • ⁇ No problem in practical use, but when held over light, unevenness is recognized at the cavity forming position of the container.
  • X There is unevenness in the cavity forming position of the container visually.
  • the method for producing a molded body containing cavities in the present invention is excellent in molding maintenance and heat insulation, and has high brightness and a uniform bright surface is formed. As a method, it can use suitably.
  • the molded body containing a cavity in the present invention is excellent in heat insulation, high brightness, brightness unevenness, and molding maintainability, for example, high heat insulation and high brightness, and container contents It can be suitably used as a bottle container that requires protection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention concerne un procédé de production d'un corps moulé renfermant une cavité, le procédé comportant une étape de moulage consistant à mouler une paraison et à produire un corps moulé, l'étape de moulage comportant un processus d'étirement consistant à étirer une paraison chauffée et un processus de soufflage consistant à gonfler la paraison étirée, ladite paraison comprenant une partie d'ouverture et un fond et étant dotée d'une amorce de goulot.
PCT/JP2010/068630 2009-12-24 2010-10-21 Corps moulé renfermant une cavité, et procédé pour sa production WO2011077821A1 (fr)

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JP2009292738A JP2011131487A (ja) 2009-12-24 2009-12-24 内部に空洞を含有する成形体、及びその製造方法

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WO2023046580A1 (fr) * 2021-09-22 2023-03-30 Société des Produits Nestlé S.A. Récipient à base de pha et procédé de fabrication d'un tel récipient

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EP2463079A1 (fr) * 2010-12-10 2012-06-13 Nestec S.A. Procédé de formation à étape unique et de remplissage de conteneurs
JP2017159919A (ja) * 2016-03-08 2017-09-14 東洋製罐グループホールディングス株式会社 延伸成形容器

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