WO1999057373A1 - Formed body - Google Patents
Formed body Download PDFInfo
- Publication number
- WO1999057373A1 WO1999057373A1 PCT/JP1999/002366 JP9902366W WO9957373A1 WO 1999057373 A1 WO1999057373 A1 WO 1999057373A1 JP 9902366 W JP9902366 W JP 9902366W WO 9957373 A1 WO9957373 A1 WO 9957373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pulp
- molded body
- molded article
- layer
- opening
- Prior art date
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
- D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies
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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
- B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
-
- 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
- B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
- B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
-
- 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
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
-
- 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
- B65D1/10—Jars, e.g. for preserving foodstuffs
-
- 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
- B65D23/00—Details of bottles or jars not otherwise provided for
- B65D23/08—Coverings or external coatings
- B65D23/0807—Coatings
- B65D23/0814—Coatings characterised by the composition of the material
- B65D23/0821—Coatings characterised by the composition of the material consisting mainly of polymeric materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
Definitions
- the present invention relates to a molded product using pulp as a main raw material.
- Plastics are generally used as raw materials for hollow containers such as containers having a lid and bottles because they have excellent moldability and are also advantageous in terms of productivity.
- plastic hollow containers have various problems in terms of disposal, and pulp hollow containers are attracting attention as an alternative. Hollow containers made of pulp are economically superior because they are easy to dispose of and can be manufactured from waste paper.
- splitters 7, 7 ' which are vertically divided into two, are manufactured by a pulp molding method.
- a method of manufacturing a hollow container having a cross section as shown in FIG. 20 (c) by bonding the end faces of two splitters together as shown in FIG. 20 (b) is known.
- the force to make the thickness of the part to be bonded larger than other parts or the margin for bonding before manufacturing the splitter must be taken. It is necessary to keep it.
- it was not easy to make only a part of the splitter thicker and much more labor was required to attach the splitter itself, and it could not be said that productivity was high.
- the bonding part is thick, if the bonding itself is not performed sufficiently, sufficient strength cannot be obtained and the contents leak out. Sometimes it goes. In addition, seam lines appeared in the bonded parts, making the appearance worse.
- Japanese Patent Application Laid-Open No. 54-133792 and Japanese Patent Application Laid-Open No. 8-320600 also propose a method for manufacturing a hollow container made of pulp. These methods did not completely solve the above problems. Therefore, an object of the present invention is to provide a pulp molded article having high strength, excellent productivity, and excellent appearance. Disclosure of the invention
- the present invention is formed mainly of pulp, comprises an opening, a body, and a bottom.
- the body has no seam, and at least one diameter in a cross section of the body is on a vertical plane including the diameter.
- the above object has been achieved by providing a molded article characterized in that the opening has a large cross section in the cross section and the outer surface and the inner surface are smooth.
- the “diameter in the cross section of the trunk” refers to the length of a line passing through the center of the cross section mainly across the cross section in any cross section of the trunk. However, the line does not necessarily have to pass through the center of the cross section.
- the “diameter in the cross section of the opening” means the length of a line passing through the center of the cross section in any cross section of the opening crossing the cross section. However, the line does not necessarily have to pass through the center of the cross section.
- FIG. 1 is a perspective view showing a first embodiment of a molded article of the present invention.
- FIG. 2 is a longitudinal sectional view of the molded body shown in FIG.
- FIG. 3 is a cross-sectional view of the compact shown in FIG.
- FIG. 4 is a diagram showing an example of a frequency distribution of fiber length of pulp fibers preferably used for the molded article of the present invention.
- FIGS. 5 (a), 5 (b), 5 (c) and 5 (d) are process diagrams sequentially showing the steps of manufacturing the molded body of the first embodiment.
- FIG. 6 is a perspective view showing a second embodiment of the molded article of the present invention.
- FIG. 7 is an exploded perspective view of a mold preferably used for manufacturing the molded body of the second embodiment.
- FIG. 8 is a vertical cross-sectional view of the mold shown in FIG. 7 cut along the mating surface and viewed.
- FIGS. 9 (a) and 9 (b) are process diagrams showing a part of the paper making process of the process of manufacturing the molded article of the embodiment shown in FIG.
- FIG. 10 is a longitudinal sectional view of a third embodiment of the molded article of the present invention.
- FIG. 11 is a cross-sectional view of the body of the molded body shown in FIG.
- FIG. 12 is a vertical cross-sectional view (corresponding to FIG. 2) of a fourth embodiment of the molded article of the present invention.
- FIGS. 13 (a), 13 (b), 13 (c), and 13 (d) are views sequentially showing the steps of laminating a plastic film on the inner surface of a molded article.
- FIG. 14 is a partially cutaway perspective view showing a main part in a state where a shrink film is coated on an outer surface of a molded body.
- FIG. 15 (a) and FIG. I5 (b) are views showing the step of covering the outer surface of the molded body with shrink film.
- FIG. 16 is a longitudinal sectional view (corresponding to FIG. 2) of a fifth embodiment of the molded article of the present invention.
- FIG. 4 is a process chart showing a part of a papermaking process in a process of manufacturing a multilayer molded article of the present invention.
- FIG. 18 is a schematic diagram showing a multilayer structure of the multilayer molded body according to the sixth embodiment.
- FIG. 19 is a schematic diagram (corresponding to FIG. 18) showing another embodiment of the multilayer structure of the multilayer molded body according to the sixth embodiment.
- FIG. 20 (a), FIG. 20 (b) and FIG. 20 (c) are diagrams showing a conventional method for producing a pulp compact.
- the molded body 10 of the first embodiment shown in FIG. I is a cylindrical bottle made of pulp as a main raw material and composed of an opening 11, a body 12 and a bottom 13. .
- the body 12 has a partially constricted shape. This constricted portion is a portion having a minimum diameter in the trunk 12. The diameter of the constricted portion is larger than the diameter of the opening 11. That is, in the molded body 10 of the present embodiment, all the diameters in the cross section of the body 12 and the diameters in the cross section of the opening 11 on the vertical plane including the respective diameters are made large. ing.
- the minimum diameter of the body 12 is set to 20 to 100 mm, particularly 40 to 80 mm.
- the diameter of the opening 11 is 10 to 50 mm, particularly 15 to 35 mm.
- the thickness of the molded body 10 is uniform in both the longitudinal section and the transverse section.
- the molded body 10 of the present embodiment is laminated as shown in FIG. There is no thick part due to combination. Therefore, as shown in FIG. There is no seam generated by bonding between the part 12 and the body part 12 to the bottom part 13. As a result, a container having an improved appearance and a good external appearance as well as a strength of the molded body can be obtained.
- the molded body 10 has a screw portion for screwing with a cap on the outer wall of the opening 11.
- the thread section has a trapezoidal longitudinal section.
- the longitudinal cross-sectional shape of the thread is not limited to a trapezoidal shape, but depends on the strength of the opening 11 and the productivity of the molded body 10 (for example, ease of drying the thread and shaping of the shape). It may be a triangle or a rectangle. When the cap is frequently opened and closed, a trapezoidal shape is more preferable.
- the molded body 10 has smooth outer and inner surfaces.
- smooth means that the center line average roughness (R a, JISB 0601) of the surface irregularities on the outer and inner surfaces of the container is 50 or less and the maximum height (R max, JISB 0601) is less than 500m.
- the molded body 10 has a body 12 formed at a right angle to the bottom 13. That is, the taper angle of the body 12 is 0 degree.
- the molded body 10 has an overall height of 5 O mm or more, preferably 100 mm or more.
- the molded body 10 is formed using pulp as a main raw material. Of course, it may be formed from 100% of pulp. The case of using other materials in addition to the pulp, the amount of the material 1-7 0 weight 0/6, preferably 5-5 0% by weight.
- Other materials include inorganic substances such as talc and force-oliginate, inorganic fibers such as glass fiber and carbon fiber, and synthetic resin powders such as polyolefin. Examples include synthetic fibers, non-wood or vegetable fibers, and polysaccharides.
- the molded article 10 has an average fiber length of 0.8 to 2.0 mm.
- the Canadian 'Standard' freeness is 100 to 600 cc, and the fiber length is 0.4 mm or more in the fiber length frequency distribution.
- the slurry to be formed is used as a papermaking raw material, since cracks do not occur during papermaking and a molded body having excellent surface smoothness can be obtained.
- the pulp fiber preferably has an average fiber length of 0.8 to 2.0 mm, more preferably 0.9 to 8 mm, and still more preferably 1.0 to 1.5 mm. Is used. If the average fiber length is less than 0.8 mm, cracks may occur on the surface of the molded product during papermaking or drying, or the molded product may have poor mechanical properties such as impact strength. Thickness unevenness is likely to occur in the pulp laminate formed during papermaking, and the surface smoothness of the molded product may be poor.
- the average fiber length in the present specification refers to a value obtained by measuring the frequency distribution of the fiber length of the pulp fiber and calculating the length-weighted average.
- pulp fibers those having a freeness of preferably 100 to 600 cc, more preferably 200 to 500 cc, and still more preferably 300 to 400 cc are used. If the freeness is less than 100 cc, the drainage is too low and it is difficult to speed up the molding cycle, which may result in poor dewatering of the compact. If it exceeds 600 cc, the drainage is too high and formed during papermaking. Thickness unevenness may occur in the pulp laminate to be produced.
- a fiber having a fiber length of 0.4 mm or more and 4 mm or less (hereinafter, this range is referred to as range A) in the frequency distribution of the fiber length is preferably 20 to 90% of the whole.
- more than 1.4 mm 3.0 m Fibers having a range of m or less (hereinafter, this range is referred to as range B) preferably occupy 5 to 50% of the whole.
- An example of the frequency distribution of the fiber length of the pulp fiber preferably used in the molded article of the present invention is as shown in FIG. 4, and the entire area of the area A in the frequency distribution curve (indicated by hatching in the figure)
- the ratio of the pulp fiber having the fiber length in the range A corresponds to the percentage (%) of the pulp fiber.
- the ratio of the area of the range B portion (shown by oblique lines in the figure) to the entire area in the frequency distribution curve corresponds to the proportion (%) of the pulp fiber having the fiber length of the range B.
- Pulp fibers having a fiber length in the range A more preferably account for 30 to 80%, more preferably 35 to 65% of the total, and pulp fibers having a fiber length in the range B more preferably occupy 7 to 80%. It accounts for 5 to 40%, more preferably 10 to 35%.
- Pulp fibers having the above average fiber length, freeness and frequency distribution of fiber length can be obtained by controlling the type (eg, NBKP, LBKP, waste paper pulp), beating conditions, and blending conditions of multiple types of pulp. Can be obtained.
- a relatively long / pulp fiber having an average fiber length of 1.5 to 3.0 mm and a relatively short pulp fiber having an average fiber length of 0.3 to 0 mm have a former / latter blend ratio of 90/90. / t 0 to 40/60 (weight basis), which is preferable from the viewpoint of obtaining the above pulp fiber by blending so as to obtain a molded article having high surface smoothness.
- the density (that is, the density of the meat portion of the container) is preferably set to 0.4 to 2. Og / cm 3 , so that the tensile strength and the compressive strength are improved. The mechanical properties such as are satisfied, and a molded article having appropriate rigidity can be obtained.
- the density is more preferably 0.6 to 5 g / cm 3 , a molded article excellent in usability can be obtained.
- the density is more preferably 0.8 to 5 g / cm 3 .
- the porosity inside the molded body 10 is reduced, liquid permeation is suppressed, and water resistance and barrier properties are improved.
- the impression of the appearance of the molded article 10 is improved, and surface properties such as suppression of fluffing of the pulp fiber are improved, and further, surface smoothness and surface hardness are improved.
- the molded body 10 preferably has a surface tension of 10 dyn / cm or less, and preferably has a water repellency (JISP 8137) of R10.
- a molded article having such surface tension and water repellency can be obtained by molding as a papermaking raw material in which additives such as a water-resistant agent and a water-repellent agent are mixed in a pulp slurry.
- the molded body 10 has a tensile strength of 5 MPa or more, particularly 10 MPa or more, because breakage due to impact or the like can be suppressed.
- the tensile strength here is measured in accordance with JISP 8113 by cutting out a measuring piece with a length of 14 Omm x 15 mm in width from an arbitrary part of the molded body 10 and then checking the distance between chucks with a tensile tester 10 It means the breaking strength when attached at Omm and pulled at a pulling speed of 20 mm / min.
- a measuring piece of the above size In the case of a molded body in which is not obtained, the size and the like of the measurement piece are appropriately changed for measurement.
- the molded article 10 preferably has a specific compressive strength of 100 Nm 2 Zg or more, particularly 110 Nm 2 / g or more, from the viewpoint that the molded article 10 is hardly crushed even when the molded articles 10 are stacked.
- the specific compressive strength mentioned here is measured by a method according to JISP 8126.
- the molded body 10 has a strength that does not break even after 10 drops. Further, as a measurement of the frontage strength of the molded body 10, when the opening 11 of the molded body 10 is pressed from the side surface and deformed by 30 mm, the pressing force is preferably 10 N or more. .
- the molded article of the present embodiment is manufactured by a pulp molding method, and is preferably manufactured by depositing pulp on the inner surface of a mold having a cavity inside.
- 5 (a) to 5 (d) sequentially show the steps of manufacturing a molded article by such a method. Specifically, (a) shows a paper making step, and (b) shows a core insertion step.
- (C) is the pressurization and dewatering step, and (d) is the step of opening the split mold and removing the pulp laminate.
- pulp slurry is injected into a set of split molds 3 and 4 having a plurality of communication holes 2 communicating with the cavity 1 from the outer surface.
- the pulp slurry is formed by dispersing pulp fibers and, if necessary, other components in water.
- the cavities of the split dies 3 and 4 are shaped so that the diameter of the opening in the obtained molded body is also small in the diameter of the body.
- the split dies 3 and 4 are depressurized (vacuum from the outside of the split dies 3 and 4) to deposit pulp fibers on the inner surface of the split dies.
- a pulp laminate 5 in which pulp fibers are laminated is formed on the inner surface of the split mold. It is.
- the split molds 3 and 4 are depressurized, and at the same time, an elastic, stretchable and hollow core 6 is inserted into the split molds 3 and 4.
- the core 6 is used to inflate like a balloon in the cavity and press the pulp laminate 5 against the inner surface of the split mold to give the inner shape of the split mold. Therefore, the core 6 is formed of urethane, fluorine-based rubber, silicone-based rubber, elastomer, or the like having excellent tensile strength, rebound resilience, and stretchability.
- a pressurized fluid is supplied into the core 6 to expand the core 6, and the expanded core 6 presses the pulp laminate 5 against the split mold inner surface. . Then, the pulp laminate 5 is pressed against the inner surface of the split mold by the expanded core 6, and the shape of the inner surface of the split mold is transferred. As described above, since the pulp laminate 5 is pressed against the inner surface of the split mold from the inside of the cavity 1, even if the inner shape of the split mold is complicated, the inner shape of the split mold is accurately adjusted to the shape of the pulp laminate. 5 will be transcribed.
- the pressurized fluid for example, compressed air (heated air), oil (heated oil), and other various liquids are used. Further, the pressure for supplying the pressurized fluid is set to 0.01 to 5 MPa, particularly to 0.1 to 3 MPa.
- the pressurized fluid in the core 6 Pull out. Then, the core 6 automatically shrinks and returns to its original size. Next, the contracted core 6 is taken out of the cavity 1, the split molds 3 and 4 are further opened, and the wet pulp laminate 5 having a predetermined moisture content is taken out.
- the pulp laminate 5 taken out is then subjected to a heating / drying step.
- a core similar to the core 6 used in the papermaking process is introduced into the pulp laminate, and a pressurized fluid is supplied into the core to expand the core.
- the pulp laminate is pressed against the inner surface of the cavity.
- the material of the core and the supply pressure of the pressurized fluid can be the same as in the papermaking process.
- the pulp laminate is dried by heating. When the pulp laminate is sufficiently dried, remove the pressurized fluid from the core and shrink the core to remove it. Open the split mold and take out the molded product.
- the molded body 10 manufactured in this manner is a cylindrical bottle in which the diameter of the body 12 is larger than the diameter of the opening 11, and the opening 11, the body i 2, and the bottom 13 are formed. Each of the portions has no joint, and the opening 11, the body 12, and the bottom i 3 are formed integrally. Moreover, the outer surface and the inner surface of the molded body 10 are both smooth.
- the molded body 10 of the second embodiment shown in FIG. 6 is a cylindrical bottle with a neck in the body 12, and the opening 11 has a depth from the upper end surface 16 to a predetermined depth d.
- a thick portion 17 which is thicker than the thickness of the body portion 12 and the bottom portion i3 is formed.
- the thick portion 17 is formed continuously over the entire circumference of the opening 11.
- the thick part 17 is discontinuous depending on the use of the molded body 10
- the thick portion 17 may be formed from the upper end surface 16 of the opening 11 to the entire region in the depth direction, but as shown in FIG. 6 as long as sufficient mechanical strength is secured. Then, it may be formed in a region from the upper end surface 16 of the opening 11 to a predetermined depth d. Although the depth d depends on the use and shape of the molded body, it is generally 0.5 to 50 mm, preferably 5.0 to 30 mm. As shown in FIG. 6, the thick portion 17 protrudes inward of the molded body 10. The extent of this overhang is preferably such that the amount of overhang X (see FIG. 6) from the inner wall of the portion of the opening i1 where the thick portion 17 is not formed is 0.5 to 5.0 mm.
- the mechanical strength of the opening 11 can be sufficiently ensured.
- the area of the upper end surface 16 of the opening 11 is increased, so that the margin for sealing the upper end surface 16 with a paper seal or the like can be increased, and the gap between the upper end surface 16 and the paper seal or the like can be increased. Adhesive strength can be increased.
- the depth d of the thick portion 17 and the overhang amount X are such that if the value of d / x is 0.L 1100, preferably 330, the mechanical strength of the opening 11 is sufficient. Can be secured. Further, as shown in FIG. 6, in the portion deeper than the depth d from the upper end surface 16 of the opening 11, the amount X of the overhang is gradually reduced so that the inner wall of the opening 11 is inclined. You may.
- the upper end surface 16 of the opening 11 is preferably smooth from the viewpoint of improving the sealing property when sealing with a paper seal or the like.
- the degree of smoothness of the upper end surface 16 is sufficient if the center line average roughness (R a) is about 50 ⁇ 11 or less and the maximum height (Rmax) is about 500 m or less. Nature is secured.
- a post-process such as polishing the upper end surface 16 by a predetermined means after the production of the molded body 10 is used.
- the molded body is manufactured using a papermaking mold described later, so that the molded article is sufficiently flat without performing the above-described post-treatment.
- a smooth upper end surface 16 can be obtained.
- a plurality of communication paths communicating from the outside to the inside are formed, and by abutting each other, a cavity having a shape corresponding to the outer shape of the molded body to be molded is formed inside.
- a space in which the slurry can stay is formed between the inside of the cavity and the inside of the cavity by being inserted into the cavity from the outside.
- It is preferably manufactured by using a papermaking mold having a retaining part forming mold.
- FIG. 7 is an exploded perspective view of a mold used for manufacturing the molded body of the present embodiment.
- This mold is different from the split molds 3 and 4 shown in FIG.
- a stagnant portion formation in which a space in which slurry can stagnate is formed between a pair of split dies 3 and 4 having the same structure and the inside of the cavity by being inserted into the cavity from outside. It has a mold 27.
- the inner surface of one split mold 4 is not shown in FIG. 7, it has the same configuration as the inner surface of the other split die 3.
- the split mold 3 is composed of a papermaking section 21A and a manifold section 2LB, and the papermaking section 21A is fitted into the manifold section 21B. ⁇
- the split mold 3 is constituted by the above. With this fitting, a manifold 2 iC is formed between the paper making section 21 A and the manifold section 21 B.
- the inner surface of the paper making section 21A may be covered with a net having a mesh of a predetermined size.
- a plurality of communication holes 24, 24,... Are regularly formed in the inner surface toward the outer surface of the papermaking section 2iA. The communication hole 24 communicates with the manifold 21C.
- a plurality of suction holes 21 D are formed in the left and right side surfaces of the manifold portion 21 B, whereby the split mold 3 is formed from the outer surface of the manifold portion 21 B by the papermaking.
- a communication path extending to the inner surface of the portion 21A is formed.
- a cavity 1 having a shape corresponding to the outer shape of the molded body to be molded is formed therein.
- the portion of the cavity 1 corresponding to the opening 1H of the molded body (hereinafter, this portion is referred to as an opening-corresponding cavity) forms an opening that opens to the outside, and this portion will be described later.
- the slurry retaining wall 27B of the retaining portion forming mold 27 which is inserted is inserted.
- a screw groove having a shape corresponding to the screw portion is formed on the inner surface of the opening corresponding cavity portion.
- the stagnation portion forming mold 27 includes a rectangular top plate 27 A, and a cylindrical slurry stagnation wall 27, which hangs from a substantially central portion of the lower surface of the top plate 27 A. B.
- the inside of the slurry retaining wall 27 B is a cylindrical cavity penetrating the retaining portion forming mold 27 in the vertical direction. This cavity becomes the slurry inflow channel 27 C in the mold.
- the slurry retaining wall 27 B of the retaining portion forming mold 27 is inserted into the cavity corresponding to the opening, and the lower surface of the top plate 27 A and the upper end surfaces of the split dies 3 and 4 are in contact with each other. Thereby, a mold is formed.
- the diameter on the outer surface of the slurry retaining wall 27B is smaller than the diameter of the cavity corresponding to the opening.
- FIGS. 9 (a) and 9 (b) show a part of the paper making process of the process of manufacturing the molded body 10 using such a mold. Specifically, FIG. In the papermaking process, (b) is a process of opening the mold and taking out the pulp laminate. still, In FIG. 9, the mold is partially omitted for simplicity.
- the injection pump (not shown) is started, the pulp slurry is sucked up from the pulp slurry storage tank (not shown), and gold is fed from the slurry inflow channel 27C.
- the pulp slurry is injected into the mold under pressure.
- the inside of the cavity 1 is depressurized by sucking from the outside of the split dies 3 and 4, and the moisture in the pulp slurry is sucked and the pulp fibers are deposited on the inner surface of the cavity 1.
- the slurry wraps around and fills the annular space 28 formed by the outer surface of the slurry retaining wall 27 B and the inner surface of the cavity corresponding to the opening. More pulp fibers are deposited than in the area.
- the pressurized fluid in the core 6 is moved as shown in FIG. 9 (b). And remove the core 6 from the cavity 1. Further, the mold is opened to take out the wet pulp laminate 5 having a predetermined moisture content. Thereafter, similar to the manufacturing process of the molded body of the first embodiment, the The lap laminate 5 is subjected to a heating / drying step, and a molded body 10 is obtained.
- the molded body 10 manufactured in this manner is thicker than the thickness of the body part 12 and the bottom part 13 in a region from the upper end face i 6 of the opening 11 to a predetermined depth. Thick portion 17 is formed.
- the upper end surface 16 is smooth, and sufficient adhesive strength can be obtained even if the upper end surface 16 is directly sealed with a paper seal or the like without any special post-treatment.
- the thick portion 17 of the molded body 10 of the present embodiment may protrude inward and outward.
- the thick portion protruding outward is used, for example, as a projection for fitting with a cap used as needed.
- FIG. 10 is a longitudinal sectional view of a third embodiment of the molded article of the present invention.
- the molded body 10 of the present embodiment is a box-shaped carton container having an opening 11 at the top.
- the body part i2 and the bottom part i3 are continuously provided via a curved surface part 1 ', whereby the impact strength of the molded body 10 is increased.
- the curvature of the curved surface section 12 must be 0.5 mm or more, especially 5 mm or more, especially 7 mm or more.
- the impact strength, drying efficiency, and surface finish of the compact are described in detail below. It is preferable in the fourth embodiment from the viewpoint that the adhesion to the plastic film is improved.
- the cross-sectional shape of the molded body i0 is a rectangular shape with four rounded corners. This also increases the impact strength of the molded body 10.
- the curvature at the four corners is preferably 0.5 mm or more, particularly 5 mm or more, especially 7 mm or more for the same reason as in the case of the curved surface portion 12 '.
- each of the four sides of the rectangle has a gently curved shape slightly expanding outward.
- the body portion 12 is formed with a continuous concave portion 29 over the entire circumference thereof, thereby improving the gripping property of the molded body 10.
- the ground plane B at the bottom 13 and the body The angle between the outer surface of the side wall of the part 12 and the outer surface is more than 85 °, preferably more than 89 ° on both the front and rear walls and the left and right walls (in FIG. 10, the angle ⁇ is approximately 90 °). ), And the height h (see FIG. 10) of the body 11 is at least 50 mm, preferably at least 100 mm. The angle ⁇ may be greater than 0.90 °.
- the thickness of the corner portion in the longitudinal section and / or the transverse section is larger than the thickness of the other portions, compared with the case where both the thicknesses are the same. It is preferable because the compression strength (buckling strength) of the entire molded body 10 is improved.
- the corner portion that is, the thickness T 2 force of the curved surface portion i 2 ′, and the thickness T 1 of the body portion 12 are larger than the thickness T 1 (ie T 2> T 1) is preferred.
- ⁇ 2 / ⁇ 1 is 1.5 to 2 2
- the compressive strength of the entire molded body 10 is further improved.
- the thickness of T1 itself is 0.1 mm or more, and that the minimum compressive strength required for the molded body 10 is exhibited. It is necessary that the molded body 10 has a predetermined compressive strength from the viewpoints of transportation of the molded body 10 and stacking of the molded body 10 in a warehouse or a store. Similarly, in the cross-sectional view of the body of the molded body 10 shown in FIG. 11, it is preferable that the thickness T2 of a part of the corner is larger than the thickness T1 of the other part.
- the density 2 of the corners in the longitudinal and / or transverse sections of the molded body 10 is higher than the density of the other parts. If it is small (that is, if 1> p2), the effect of simultaneously satisfying the trade-off phenomena of improving the compressive strength of the molded body 10 and reducing the amount of material used can be obtained. In this case, 0.lxl and 2 and pi make this effect even more pronounced.
- the compressive strength is 190 N or more. The compressive strength is determined by moving the compact 10 from the height direction. Maximum strength when compressed at 20 mm / min.
- the pressure and the flow rate of the pressurized fluid at the time of pressing by the core 6 may be made appropriate.
- a thin plastic layer is formed on the outer surface L4 and the inner surface 15 thereof.
- the strength of the molded body 10 can be further increased, and leakage of contents can be effectively prevented.
- the thickness of each plastic layer is appropriately selected according to the thickness of the molded body 10, the type of the contents, and the like, but is generally 5 to 300 um, particularly 10 to 200 wm, and particularly preferably 20 to 100 wm. 100 m Or different.
- various kinds of thermoplastic synthetic resins such as boroethylene-polypropylene, emulsion latex such as acryl-based emulsion, and hydrocarbon-based pettus are used.
- a material made of an appropriate material is selected according to the purpose of lamination, for example, the purpose of imparting water resistance and gas barrier property.
- films made of polyolefins such as polypropylene and polyethylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polystyrene, and polycarbonate can be used.
- a multilayer film in which a plurality of films made of these materials are combined can be used.
- the core 6 is replaced by polyethylene or polyethylene.
- a bag-shaped core made of a plastic film such as a polypropylene film, a film obtained by depositing an aluminum foil on the plastic film, and a film obtained by laminating an aluminum foil on the plastic film is used. After the pulp laminate 5 is pressed by the core, the core is laminated on the inner surface of the pulp laminate 5 without taking out the core, whereby a plastic layer is formed on the inner surface of the molded body 10.
- a plastic layer may be formed on the inner surface of the molded body 10 by using a core made of a bottomed plastic cold parison (preform) preheated to a predetermined temperature instead of the elastic core. be able to. That is, after the above-mentioned parison is inserted into the pulp laminate 5, a pressurized fluid is supplied into the parison to expand the parison, and a plastic film is formed on the inner surface of the pulp laminate to form a close contact. Plastic layer on inner surface of molded body 10 Is formed.
- a vacuum molding method or a pressure molding method can be used as another method of laminating a plastic film on the inner surface of the molded body 10.
- the method shown in FIG. 13 is used.
- a first vacuum chamber 30 and a first vacuum chamber 40 are used as shown in FIG. 13 (a).
- the first vacuum chamber 30 has an opening 31 opened at the top.
- a through hole 32 is formed in the side wall near the bottom, and the through hole 32 is connected to a vacuum suction means (not shown).
- the inner shape of the cross section of the opening 31 is slightly larger than the outer shape of the cross section of the opening 11 of the molded body 10.
- the second vacuum chamber 40 has an opening 41 at its lower part.
- the opening 41 of the second vacuum chamber 40 has a shape capable of closing the opening 31 of the first vacuum chamber 30.
- the inner shape of the cross section of the opening 41 is larger than the inner shape of the cross section of the opening 31 of the first vacuum chamber 30.
- a plurality of through holes 42, 42,... are formed in the upper top surface of the second vacuum chamber 40, and these through holes 42 are connected to vacuum suction means (not shown). ing. Further, a heating means 43 such as an electric heater is provided on the inner wall of the upper top surface.
- the molded body 1 is placed in the first vacuum chamber 30. 0 is placed so that its opening 11 faces upward.
- the depth of the first vacuum chamber 30 is substantially the same as the height of the molded body 10, and as a result, the upper end surface of the opening of the molded body 10 in the mounted state and the first vacuum chamber The upper end face of the opening 30 is located substantially on the same plane.
- the opening 31 is closed by the unstretched resin film 50 using a stretchable plastic film 50.
- plastic The film 50 is larger than the cross-sectional shape of the first vacuum chamber 30.
- the opening 31 is closed by the plastic film 50 and the top surface of the opening 31 is entirely closed.
- the second vacuum chamber 40 is arranged on the first vacuum chamber 30 so that the opening 41 faces the plastic film 50. Since the first vacuum chamber 30 and the second vacuum chamber 40 have the same outer cross-sectional shape, the plastic film 50 is in contact with the peripheral portion of the opening 31 of the first vacuum chamber 30. And the peripheral portion of the opening 41 of the second vacuum chamber 40.
- both the inside of the first vacuum chamber 30 and the inside of the second vacuum chamber 40 are airtight.
- both vacuum chambers may be fixed by fixing means such as fixing metal fittings.
- the ratio of the surface area of the pre-stretched plastic film 50 to the surface area of the plastic film 50 after being laminated on the molded body 10 is 3 to 0.7, especially 2 to 0.7.
- the plastic film 50 is pre-stretched so as to be 9
- the lamination is performed in a state where the molded body 10 and the plastic film 50 are further in close contact with each other.
- lamination on the molded body 10 having a complicated shape is further facilitated.
- Pressure in the second vacuum chamber 40 vacuum Degree
- a general range is 40 °. It is preferably kPa or less, particularly preferably from 130 to 1 Pa.
- the heating means 43 provided on the inner wall of the upper top surface of the second vacuum chamber 40 provides The plastic film 50 is heated to a predetermined temperature.
- the heating temperature of the plastic film 50 is, for example, when polyethylene or polypropylene whose glass transition temperature (T g) is 23 ° C.
- the plastic film 50 it is preferable because the layers are laminated in a state of being more closely adhered to the molded body 10 without being broken.
- the above glass transition point means the glass transition point of the material having the lowest glass transition point among the above materials.
- the first vacuum chamber 30 is connected to the first vacuum chamber 30 by vacuum suction means (not shown) connected to the through hole 32. Is evacuated.
- the inner wall of the opening 31 of the first vacuum chamber 30 and the opening 1 1 of the molded body 10 Since an air gap is formed between the molded body 10 and the outer wall of the molded body 10, the inside and the outside of the molded body 10 are in communication with each other with respect to gas flow. Therefore, by the vacuum absorption I, the inside of the first vacuum chamber 30, that is, the inside and the outside of the molded body 10 are brought into a vacuum state similarly to the inside of the second vacuum chamber 40.
- the pressure (degree of vacuum) in the first vacuum chamber 30 is not particularly limited, but is preferably 40 kPa or less, particularly preferably 130 to 1 Pa as a general range.
- the vacuum suction in the second vacuum chamber 40 is stopped, and further, the vacuum in the second vacuum chamber 40 is broken, and the inside of the second vacuum chamber 40 is pressurized to a predetermined pressure.
- This operation can be performed instantaneously by switching a three-way valve or the like.
- the inside of the first vacuum chamber 30 is under vacuum suction.
- the plastic film 50 which has been in close contact with the inner wall of the second vacuum chamber 40 is instantaneously in the first vacuum chamber 30, ie, in the present embodiment.
- the plastic film 50 is pressed and stretched toward the inside of the molded body 10, and the plastic film 50 is adhered and laminated on the inner surface of the molded body L 0.
- the plastic film 50 is stretched in the direction opposite to the pre-stretching direction.
- the plastic film 50 is heated to a predetermined temperature by the heating means 43 immediately before the vacuum in the second vacuum chamber 40 is broken, so that the plastic film 50 is stretched and formed into a molded body L0. Adhesion is performed extremely smoothly, and tearing and the like due to stretching are effectively prevented.
- a predetermined pressurized fluid is used for pressurizing the second vacuum chamber 40, and air is simply used.
- the plastic film 50 was laminated on the molded body i0 with good adhesion without breaking the plastic film 50. It is preferable that it is 100-300 Pa, especially 200-1000 Pa from a viewpoint of making it.
- the plastic film 50 When the plastic film 50 is laminated on the molded body 10 while the molded body i0 is heated to a predetermined temperature, the plastic film 50 is formed without breaking the plastic film 50 further.
- the layer can be further laminated with good adhesion to 10 layers. The reason for this is that the stretchability of the plastic film 50 at the time of lamination is kept good.
- a predetermined heating means may be provided on the inner surface of the side wall of the first vacuum chamber 30.
- the heating temperature of the molded body 10 is preferably from 40 to 150 ° C. from the viewpoint of preventing re-shrinkage of the plastic film 50 and production efficiency.
- the vacuum suction in the first vacuum chamber 30 is stopped, and the inside of the first vacuum chamber 30 is returned to the atmospheric pressure.
- the second vacuum chamber 40 is removed, and the molded body 10 on which the plastic film 50 is laminated is taken out from the first vacuum chamber 30.
- the unlaminated plastic film 50 remains around the opening of the molded body 10, and is trimmed.
- the inner surface of the molded body 10 and the upper end surface of the opening are tightly covered with a plastic film 50 and laminated.
- the stretching ratio of the plastic film 50 is determined by the ratio between the surface area of the plastic film 50 after being laminated on the molded body 10 and the opening area of the opening 31 of the first vacuum chamber 30 (the former / the latter).
- the plastic film 50 can be formed without breaking the plastic film 50 even if lamination is performed under the condition of a high draw ratio of 4 to 10 times. 0 can be laminated with good adhesion.
- the molded body 10 has air permeability. There is an advantage that the film can be laminated regardless of the type. In addition, since there is no need to perform vacuum suction through the molded body 10, the time required for vacuum suction and evacuation can be significantly reduced as compared with the conventional vacuum forming method and the like, and productivity can be significantly improved. . In addition, the molded body is
- the thickness of the plastic film after lamination is 5 to 200 m, especially 20 to 100 m
- the degree is preferably from the viewpoint that desired characteristics such as water resistance and gas barrier property can be imparted to the molded body 10.
- the thickness before lamination is a force depending on the thickness after lamination and the stretching ratio; etc .; It is preferable from the viewpoint of the heating property of the plastic film in terms of heating efficiency.
- the molded body 10 is inverted (ie, the opening 11 of the molded body 10 faces downward) in the first vacuum chamber 30.
- the plastic film 50 can be laminated on the outer surface of the molded body 10.
- the shape of the opening 31 of the first vacuum chamber 30 is extremely larger than the outer shape of the opening 11 of the molded body 10 so that the opening 31 of the first vacuum chamber 30 is formed.
- another film is interposed between the bottom surface of the molded body 10 and the bottom surface of the inner wall of the first vacuum chamber 30 so that the inner surface and the outer surface including the bottom surface of the molded body 10 can be simultaneously formed by two sheets. It can be laminated with film.
- the shrinkage of the plastic film after leaving the molded article at 60 ° C. for 30 minutes is 30%. % Or less, particularly preferably 10% or less.
- the plastic film may be partially separated, or the molded article 10 may be torn from the part where the plastic film has been separated, and the long-term storage stability is reduced.
- the shrinkage is determined by measuring the distance between any two points on the surface of the molded body on which the plastic film is laminated before and after storage under the above conditions, and (i—distance before storage / distance after storage) X 1 Calculate from 0 0
- the molded body on which the plastic film is laminated may be gradually cooled after being heated to a temperature higher than the glass transition point of the plastic film.
- the plastic film is made of a laminate of two or more plastic materials, it may be heated to a temperature higher than the glass transition point of the plastic material having the lower glass transition point.
- a solvent-based or water-based paint is used to form the plastic layer, micropores may be formed in the plastic layer when the solvent evaporates, and sufficient gas barrier properties (water and oxygen barrier properties) may not be exhibited. is there. Further, the molded article may be deformed by a solvent or the like. On the other hand, a plastic layer formed by powder coating does not have such a disadvantage, and a molded article having a sufficient gas-free property can be obtained.
- powders such as an olefin resin, a polyester resin, an epoxy resin, and an acrylic resin are used. Previous The powder may be formed from 100% of the resin, and may be colored by adding various pigments as necessary.
- conventionally known additives used in the coating composition can be used without any particular limitation. Examples of the additive include a repeller such as acrylate polymer / silicone resin, and a pinhole inhibitor such as benzoin. Each of these additives is preferably used in an amount of about 0.1 to 5 parts by weight based on 100 parts by weight of the resin.
- the total thickness of the plastic layer (the sum of the two when the plastic layer is formed on the inner and outer surfaces of the molded body) is appropriately selected according to the use, thickness, type of contents, etc. of the molded body. Generally, it is preferably from 500 to 600 m, and particularly preferably from 100 to 400 m from the viewpoint of moisture permeability, productivity and cost.
- a coating gun is used for powder coating, and the coating gun has a nozzle provided at the tip thereof with a corona electrode capable of forcibly charging the powder simultaneously with discharging the powder coating.
- the powder coating charged at the same time as the discharge is applied to the outer surface and / or inner surface of the molded body to be coated by electrostatic force.
- the applied voltage applied to the powder coating be 110 to 180 kV, particularly ⁇ 40 to ⁇ 70 kV.
- a baking process is performed, and the applied powder coating is melted and cured to form a plastic layer.
- a baking furnace capable of heating to a predetermined temperature is used for baking.
- the baking conditions were set at a temperature of 70 to 230 ° (particularly 140 to 200 ° C, and a time of 1 hour, in terms of productivity, smoothness of the coating film surface, and prevention of pulp burning.
- a resin solution or a resin emulsion is formed on the outer surface and / or inner surface of the molded product.
- a plastic layer is formed by applying a plastic layer.
- the thickness of the plastic layer is preferably 5 to 300 m, particularly preferably 20 to 150 mzm, and the ratio of the thickness of the plastic layer to the thickness of the molded product (former / latter) is 1 / It is preferably 2 to 1 / i00, particularly preferably 1/5 to i / 50.
- the thickness of the plastic layer is less than 5 ⁇ m, the storage stability of the contents may not be sufficient because sufficient waterproof and moisture-proof effects cannot be obtained. If the thickness is more than 30 Om, it takes time to dry the plastic layer. In some cases, problems such as dripping of the coating liquid during coating and uneven thickness of the plastic layer may occur.
- the thickness of the plastic layer is measured by observing the cross section of the molded article under a microscope.
- the molded article of the present embodiment is different from a conventional method in which a coating liquid is applied to a pulp molded article to form a plastic layer, and the area of the pulp fiber constituting the molded article and the plastic layer are formed. It is clearly distinguished from the resin area.
- the boundary between the pulp fiber region and the polymer compound region is not clear.
- the boundary is clear because the resin penetration is small.
- the ratio of the thickness of the plastic layer to the thickness of the molded body is more than 1/2, the disintegration during reuse is inferior, and if it is less than 1/1100, sufficient waterproof and moisture-proof properties can be obtained. Can not.
- the thickness of the molded body is appropriately adjusted within the range where the above ratio is 1/2 to 1/100, preferably 100 to 300 m, more preferably 5 to 100, depending on the use and the like. 000 to 200; um.
- Resins contained in the coating solution for forming the plastic layer include acryl-based resins, styrene-acrylic resins, ethylene monoacetate-based resins, styrene vinyl alcohol-based resins, polybutyl alcohol-based resins, vinylidene chloride-based resins, wax-based resins, and the like. Examples thereof include fluorine-based and silicon-based resins, copolymers thereof, and combinations thereof.
- the porosity of the molded product To control the penetration of the coating solution into the molded product, the porosity of the molded product
- the porosity is calculated from the following equation (1).
- the density of the molded body is calculated from the weight and thickness of a part of the molded body, and the density of the material constituting the molded body is determined by the content ratio and density of pulp fiber and other components. It is calculated from
- the bump water absorption (JISP 8140) of the molded product is set to 5 to 600 g / (m 2 ⁇ 2 minutes), and particularly to 10 to 200 g / (m 2 ⁇ 2 minutes).
- the coating liquid is spray-dried by a predetermined spraying means after pre-drying the wet pulp laminate 5 obtained in FIG. 5 (d) to a predetermined moisture content, for example, about 0.1 to 25% by weight. Applied.
- a predetermined moisture content for example, about 0.1 to 25% by weight.
- the emulsion it is preferable to use an emulsion having a resin particle size of about 0.01 to 0.5 m from the viewpoint of control of the penetration of the emulsion into the molded body.
- a plastic layer on the outer surface of the molded body i0 for example, there is a method of covering the outer surface of the molded body i0 with a shrink film.
- the predetermined characters, figures, symbols, and the like may or may not be printed on the shrink film.
- the shrink film covers the entire outer surface of the molded body 10.
- the mode of covering the shrink film depends on the type of the content.
- the embodiment shown in FIG. 14 can be used.
- the embodiment shown in FIG. 14 is particularly effective when accommodating contents that generate gas due to moisture absorption or the like.
- the shrink film 5 # is not the entire outer surface of the molded body 10 but the contents 5. 2 covers the outer surface of the molded body 10 to a height not lower than the upper end of the container and lower than the upper end of the container. (The space between the upper end of the contents 52 and the upper end of the container is called the head space. ).
- the head space The space between the upper end of the contents 52 and the upper end of the container.
- the outer surface of the molded body 10 corresponding to the head space is covered with the shrink film 51.
- the amount of the shrink film can be reduced by adopting the covering mode shown in FIG. In this case, however, the heads-based It may be considered that there is a possibility that moisture or oxygen may enter through the wall surface of the molded body 10 corresponding to the temperature. However, in that case, moisture and oxygen will come into contact with the contents indirectly through the head-based space. In addition, the indirect contact speed of moisture and oxygen is considerably lower in terms of mass transfer than the speed of direct contact of moisture and oxygen to the contents through the wall surface of the molded body 10. Therefore, if the molded body 10 is covered up to the height at which the contents are stored, that is, if direct contact through the wall surface of the molded body 10 is avoided, the molded body 10 corresponding to the head base is formed. There is no major inconvenience for ingress of moisture or oxygen through the 0 wall.
- the shrink film 51 is made of a film such as an olefin resin or a polyester resin. OPS) is used. Polypropylene (PP), polyethylene (PE), etc. are used as materials that are thin and have good extensibility for use in shrinking (overlapping) the entire product.
- the above-mentioned material for the shrink film is composed of a single-layer or multi-layer uniaxial or biaxially stretched film. Considering shrink finish, dimensional stability and strength, heat shrinkage (JISZ1799) is 40% or more, natural shrinkage (40%, 7 days) is 2% or less, tensile strength in shrinkage direction It is preferable to select a material having a tensile strength of not less than 20 ⁇ 10 6 Pa and an elongation of not less than 50%.
- the thickness of the shrink film 51 is appropriately selected according to the use of the molded article 10 covered with the shrink film 51, the thickness of the molded article 10, the type of the contents, and the like. It is 50 m, especially 30 to 70 m.
- the molded body 1 0 outer surface is covered with shrink film, oxygen transparently resistance 5 0 0 cm (m 2 ⁇ hr ⁇ atm) or less, particularly i 0 0 cm 3 / (m 2 • hr.atm) or less, preventing the inside of the molded product from being overoxidized, and preventing the quality deterioration and deterioration of the contents.
- Oxygen permeability is measured by the method of JISK 712.
- the molded body whose outer surface is covered with the shrink film is obtained by surrounding the molded body having a water content of 5 to 35 % by weight with the shrink film, and then irradiating the shrink film with a microphone opening wave. It is preferably manufactured by shrinking to tightly coat the molded body and drying the molded body. First, as shown in FIG. 15 (a), the entire outer surface of the molded body 10 is surrounded by a shrink film 51. As the molded body 10, it is preferable to use the one having a predetermined moisture content manufactured in FIG. 5 (d) described above.
- the shrink film has a shape in which a sheet-like material is formed into a cylindrical shape, and one end of the tube is sealed in an arc shape (generally called an R seal) and then cut.
- the gap between the outer surface of the body and the bottom of the molded body 10 and the shrink film is not so large, but the gap between the outer surface of the opening and the shrink film is relatively large.
- a canopy portion 53 having a hanging wall is provided around the periphery thereof, and the entire canopy portion 53 including the hanging wall is capable of generating heat by irradiation of the microwave.
- the opening of the molded body 10 is covered by the over cover 54 together with the shrink film surrounding it.
- the gap between the inner surface of the hanging wall and the shrink film is preferably as small as possible.
- the microwave is irradiated in this state. Due to this irradiation, the moisture contained in the molded body 10 is heated and generates heat, and the generated heat shrinks the shrink film to tightly coat the molded body 10. At the same time, moisture is removed from the molded body 10 and final drying of the molded body is performed. That is, in the present production method, shrinkage of the shrink film 51 and final drying of the molded product 10 were carried out.
- the two drying steps can be performed in a single step called microwave irradiation.
- the irradiation When the microwave is irradiated, in particular, at the opening of the molded body 10, the irradiation also generates heat in the canopy part 53 of the over cover 54 together with the molded body 10, and the heat generated causes the shrink film. Contracts.
- the gap between the shrink film and the outer surface of the opening becomes smaller due to this shrinkage, heat generated from the opening itself is added to the shrink film, so that shrinkage of the shrink film is further promoted.
- the appearance of the shrink film after shrinking is improved.
- shrinkage of the shrink film using the over-cover 54 is effective when the diameter of the molded body is not the same from the opening to the bottom, and particularly, the diameter of the opening is equal to the diameter of the body.
- the diameter is smaller than 50%, it is effective when the diameter of the opening is 50% or less of the diameter of the trunk.
- the canopy portion 53 of the over cover 54 can generate heat by irradiating the microwave.
- the canopy part 53 is easy to process into a shape close to the outer shape of the molded body, has good heat generation efficiency of itself, and has good covering properties and operability of the shrink film.
- the shape of the canopy 53 is not particularly limited as long as it can surround the shrink film located on the outer surface of the opening of the molded body 10.
- the wavelength of the microphone mouth wave to be irradiated is generally from 300 MHz to 300 GHz, and a wavelength that maximizes the heat generation efficiency is appropriately selected.
- the molded body 10 covered with the shrink film in this manner is thereafter filled with the contents. Also, depending on the type of content, After filling the pre-dried molded body 10 with the contents, a shrink film may be coated.
- part or all of the opening 11 is formed of plastic. Since the opening is the most stressed part when the molded body 10 is used, the durability of the molded body is improved by using plastic as a material for forming this part. As the plastic, those similar to the material constituting the plastic layer in the fourth embodiment can be used. When a part of the opening is made of plastic, the part of the opening, such as the screw fitting part, the inner ring of the cap, and the seal part such as the contact ring, should be made of plastic. Is advantageous from the viewpoint of improving the durability of the molded body.
- the molded article of the sixth embodiment is provided between the first pulp layer and the second pulp layer having a different composition from the first pulp layer, from the composition of the first pulp layer to the second pulp layer. It has a multilayer structure in which a mixed layer whose composition continuously changes to the compounding composition of the pulp layer is formed.
- the multilayer molded article of the present embodiment has a cavity having a shape corresponding to the outer shape of the molded article to be molded by abutting a set of papermaking split dies each having a plurality of communication holes communicating from the outside to the inside. Press-inject the first pulp slurry into the cavity of the mold in which
- a second pulp slurry having a different composition from the first pulp slurry is injected into the cavity under pressure
- FIG. 17 shows a process chart showing a part of a paper making process in a process of manufacturing the multilayer molded body of the present embodiment, wherein (a) shows a first pulp slurry injecting process, b) is a step of dehydrating the first pulp slurry and injecting a second pulp slurry, and (c) is a step of dehydrating the second pulp slurry.
- a pair of split dies 3 and 4 are abutted to form a cavity with a shape corresponding to the outer shape of the molded object to be molded.
- a predetermined amount of the first pulp slurry I is injected under pressure into the cavity 1 from the upper opening.
- the structure of the split molds 3 and 4 is the same as the split mold shown in FIG. 5 described above.
- a pump is used for pressurized injection of the first pulp slurry I.
- the pressure of the pressure injection of the first pulp slurry I is preferably 0.01 to 5 MPa, more preferably 0.01 to 3 MPa.
- the water in the first pulp slurry is discharged out of the mold and pulp fibers are deposited on the inner surface of cavity L as shown in Figure i7 (b).
- a first pulp layer 55 as an outermost layer is formed on the inner surface of the cavity 1.
- a second pulp slurry having a different composition from the first pulp slurry is injected into the cavity 1 from the upper opening of the mold under pressure.
- the pressure at which the second pulp slurry II is injected under pressure can be substantially the same as the pressure at which the first pulp slurry I is injected under pressure.
- a mixed layer (not shown) of the pulp composed of the components of the mixed slurry is formed on the first pulp layer 55.
- the ratio of the second pulp slurry can be increased over time and continuously as compared with the ratio of the first pulp slurry.
- the composition continuously changes from the composition of the first pulp slurry to the composition of the second pulp slurry.
- the first pulp slurry I and the second pulp slurry H are continuously injected into the cavity 13, so that a multilayer molded body can be efficiently produced. Can be.
- the types of the first pulp slurry and the second pulp slurry are not particularly limited as long as their composition is different from each other. ⁇
- the pressurization injection of the second pulp slurry is stopped, and air is pressurized into the cavity 1 to perform depressurization. After that, the same steps as those of the method for manufacturing a molded body of the first embodiment including the steps shown in FIGS. 5B to 5D are performed, and a multilayer molded body is obtained.
- the multilayer structure of the molded article of the present embodiment is as shown in FIG. 18, and a first pulp layer 55 as the outermost layer and a second valve layer 57 as the innermost layer include a second layer.
- a mixed layer 56 whose composition continuously changes from the composition of the first pulp layer to the composition of the second pulp layer is formed.
- the bonding strength between the first pulp layer 55 and the second pulp layer 57 is increased, and the separation between the two layers is effectively prevented.
- the fact that the mixed layer 56 is formed between the first pulp layer 55 and the second pulp layer 57 indicates that It can be confirmed by microscopic observation.
- each of the first pulp layer 55, the mixed layer 56, and the second pulp layer 57 can be appropriately determined according to the use of the molded article.
- the thickness of the outermost layer is 5 to 50% of the total thickness of the molded body, particularly 10 to 50%.
- pulp fibers having low whiteness are used for the inner layer, it is preferable because sufficient hiding power can be exhibited from the outside.
- the thickness of each layer is determined by the injection amount and the concentration of the i-th and second pulp slurries at the time of production of the compact.
- the molded article of the present embodiment has a multilayer structure, it is possible to individually impart a function to each layer.
- the first pulp layer 55 as the outermost layer can be a colored layer by blending a coloring agent such as a pigment or a dye or a colored paper or synthetic fiber only in the first pulp slurry.
- a coloring agent such as a pigment or a dye or a colored paper or synthetic fiber only in the first pulp slurry.
- Incorporating a colorant only in the first pulp slurry is necessary when blending pulp with relatively low whiteness, for example, pulp made from waste paper such as deinked pulp, into the same slurry (for example, if the whiteness is 60%). % Or more, especially 70% or more), because the color tone can be easily adjusted.
- the amount of the colorant is preferably 0.1 to 15% by weight of the amount of the pulp fiber.
- the resulting molded article will have good surface smoothness and will be suitable for printing and coating.
- the outermost layer can be formed.
- the first pulp layer 55 can be given a function corresponding to the function of each additive.
- thermoplastic synthetic resin powder or fiber with the first pulp slurry, the first pulp layer 55 can be provided with abrasion resistance and fuzziness can be suppressed. This degree of wear resistance is A force of 3 H or more expressed in pencil pull strength (JISK540); preferred.
- the pulp slurry used for forming the first pulp layer 55 as the outermost layer has an average fiber length of 0.2 to 1.011111, particularly 0.25 to 0.9 mm, particularly 0.3 to 0.8 mm, Canadian 'Standard-Freeness is 50-600 cc, especially 100-500 cc, especially 200-400 cc, and the fiber length in the frequency distribution of fiber length 0.
- Slurry containing pulp fibers in which fibers in the range of 4 mm or more and 1.4 mm or less account for 50-95%, especially 60-95%, especially 70-95% of the total It is preferable to use, because the transferability of the inner surface shape of the cavity is improved.
- the pulp slurry used for forming the second pulp layer 57 as the innermost layer has an average fiber length of 0.8 to 2.0 mm, especially 0.9 to 8 mm, especially 1 .0-1.5 mm, Canadian
- -Standard ⁇ Freeness is 100 to 600 cc, especially 200 to 50
- Occupies 0-90%, especially 30-80%, especially 35-65% and 1.
- the thickness of the innermost layer is preferably 30 to 95%, particularly preferably 50 to 90% of the total thickness.
- the additives and the like may be blended only in a specific layer in which the properties are most efficiently exhibited. Therefore, there is an advantage that the amount of additives and the like can be reduced.
- the second pulp layer 57 shown in FIG. 18 has a different composition from the second pulp layer 57 and the first pulp layer 55.
- the third pulp layer 59 is formed from the composition of the second pulp layer 57 between the second pulp layer 57 and the third pulp layer 59.
- a mixed layer 58 whose composition is continuously changed to the compounding composition of 9 may be formed to have a total layer structure of five layers.
- a multilayer molded body using various kinds of raw materials can be obtained.
- a first pulp layer 55 ′ is further formed on the side of the second pulp layer 57 shown in FIG. 18, and the first pulp layer 57 and the first pulp layer 55 ′ are further combined.
- a mixed layer 5 6 ′ having a composition continuously changed from the composition of the second pulp layer 57 to the composition of the first pulp layer 55 * is formed, and the innermost layer and the outermost layer are formed. May have the same composition and may have a total of five layers.
- the i-th pulp layer 55, 55 ' is composed of pulp having high whiteness
- the second pulp layer 5b is composed of pulp having whiteness such as waste paper, so that the appearance whiteness is improved. And a low-cost molded product can be obtained.
- the present invention is not limited to the above embodiments, and the steps, devices, members, and the like in the above embodiments can be appropriately replaced with each other.
- the mold used in the present invention may use two papermaking split dies as a set, or three or more papermaking split dies as one set, depending on the shape of the molded article to be formed. May be used. The same applies to the heating type.
- the bottle-shaped molded body shown in FIG. 1 was formed by the method shown in FIG. Details of the pulp in the slurry used are shown in Table 2 below.
- the table shows the quality of the moldability during molding.
- used paper B used in Examples 2 to 4 is ⁇ A used paper made of LB KP and has a small freeness value.
- LBKP used in Example 5 is Senibra (trade name) and has a large freeness value.
- the molded product shown in FIG. 10 was obtained by using the method shown in FIG.
- the molded product had an Ra of 3 wm and an Rmax of 30 m.
- the curvature of the corner connecting each side wall and the corner connecting each side wall and the bottom surface was 1 Omm.
- the molded body had no seams, and the outer and inner surfaces were smooth.
- This compact was set in the vacuum chamber shown in FIG. I3, and the plastic film was laminated by the method described above. As a result, lamination was performed with sufficient adhesion.
- the plastic film When laminating, the plastic film was heated in a non-contact state to 100 ° C. The thickness of the laminated plastic film was about 4 Om. The molded body on which the plastic film was laminated was heated while being pressurized to 120 t, and then gradually cooled to room temperature. The shrinkage of the plastic film in the lateral direction of the molded product was measured and was found to be 3.2%.
- a slurry for the outermost layer containing 1.0% by weight of pulp fibers having the physical properties shown in Table 3 was injected under pressure at a pressure of 0.3 MPa into the cavity from the inlet of the pulp slurry of the molding die shown in Fig. 17. .
- the inside of the cavity was dehydrated to form the outermost layer on the inner surface of the cavity with the slurry for the outermost layer.
- a slurry for the innermost layer containing 1.0% of pulp fibers having the physical properties shown in Table 3 was injected under pressure into the cavity at a pressure of 0.3 MPa.
- the heating mold has a cavity having the same shape as the mold.
- An elastic core made of elastic material is inserted into the pulp laminate installed in the heating mold, and air is pressed into the core at a pressure of 5 MPa to heat the pulp laminate while pressing it against the inner surface of the cavity.
- the mold was heated to 200 ° C. to dry the pulp laminate.
- the heating mold was opened, and a bottle-shaped molded product was taken out.
- Table 3 shows the moldability of the obtained molded body. The surface roughness of the molded product was measured by Surfcom 110A of Tokyo Seimitsu Co., Ltd.
- a molded article made of pulp having high strength, excellent productivity, and excellent appearance is provided.
- Such compacts have low manufacturing costs and can be recycled or incinerated after use, leading to a reduction in garbage.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Food Science & Technology (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99918322A EP1126083B1 (en) | 1998-05-07 | 1999-05-06 | Formed body |
DE69942126T DE69942126D1 (de) | 1998-05-07 | 1999-05-06 | Formkörper |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12501398 | 1998-05-07 | ||
JP10/125013 | 1998-05-07 | ||
JP37371798A JP3118708B2 (ja) | 1998-12-28 | 1998-12-28 | パルプモールド中空成形体 |
JP10/373717 | 1998-12-28 | ||
JP10/373716 | 1998-12-28 | ||
JP10/373715 | 1998-12-28 | ||
JP37371698 | 1998-12-28 | ||
JP37371598A JP3118707B2 (ja) | 1998-05-07 | 1998-12-28 | 中空容器 |
JP11/29290 | 1999-02-05 | ||
JP2929099 | 1999-02-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999057373A1 true WO1999057373A1 (en) | 1999-11-11 |
Family
ID=27521120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002366 WO1999057373A1 (en) | 1998-05-07 | 1999-05-06 | Formed body |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1126083B1 (ja) |
DE (1) | DE69942126D1 (ja) |
WO (1) | WO1999057373A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022138563A1 (ja) * | 2020-12-25 | 2022-06-30 | 凸版印刷株式会社 | パルプモールド成形品及びその製造方法 |
WO2023232995A1 (de) * | 2022-06-03 | 2023-12-07 | Alpla Werke Alwin Lehner Gmbh & Co. Kg | Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling |
GB2620390A (en) * | 2022-07-04 | 2024-01-10 | Pulpex Ltd | Method and system for forming a receptacle |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7249725B2 (en) | 2002-11-22 | 2007-07-31 | Sultex Ag | Thread carrying apparatus and a textile machine, in particular a weaving machine, including a thread carrying apparatus for this kind |
SE529897C2 (sv) | 2006-03-27 | 2007-12-27 | Rottneros Ab | Formpressat tråg |
US9145224B2 (en) * | 2009-06-11 | 2015-09-29 | Ellery West | Paper container having a reinforced neck |
WO2013192260A1 (en) * | 2012-06-19 | 2013-12-27 | Pepsico, Inc. | Method for making molded fiber bottles |
US20160145811A1 (en) * | 2014-11-20 | 2016-05-26 | Pepsico, Inc. | Method For Making Molded Fiber Bottles |
US10486891B2 (en) | 2016-12-02 | 2019-11-26 | S.C. Johnson & Son, Inc. | Plastic bottle for a pressurized dispensing system |
DE102017214473A1 (de) * | 2017-08-18 | 2019-02-21 | Sig Technology Ag | Ein Verfahren zum Herstellen eines Behälters aus einer Zusammensetzung, beinhaltend eine Flüssigkeit und eine Vielzahl von Partikeln, insbesondere unter Einhaltung einer maximalen Geschwindigkeit der Zusammensetzung |
DE102017214472A1 (de) * | 2017-08-18 | 2019-02-21 | Sig Technology Ag | Ein Behälter mit einer ungefalteten Behälterschicht, beinhaltend eine Vielzahl von Partikeln, und einer Polymerschicht |
DE102017214471A1 (de) * | 2017-08-18 | 2019-02-21 | Sig Technology Ag | Ein Verfahren zum Herstellen eines Behälters aus einer Zusammensetzung, beinhaltend eine Flüssigkeit und eine Vielzahl von Partikeln |
DE102017214469A1 (de) * | 2017-08-18 | 2019-02-21 | Sig Technology Ag | Ein Verfahren zum Herstellen eines Behälters aus einem Behälterrohling, insbesondere mit einem Verringern einer Höhe des Behälterrohlings |
CH718745A1 (de) * | 2021-06-16 | 2022-12-30 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Faserbasierter Behälter. |
EP4370436A1 (en) * | 2021-07-16 | 2024-05-22 | Huhtamaki Molded Fiber Technology B.V. | Moulded fiber container for dairy products, method for manufacturing such container and use thereof |
CH720000A9 (de) * | 2022-08-30 | 2024-05-15 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Verfahren zum Beschichten eines getrockneten Rohlings. |
Citations (4)
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JPS54133972A (en) * | 1978-04-05 | 1979-10-18 | Dainippon Printing Co Ltd | Combined container and making method thereof |
EP0562590A1 (en) * | 1992-03-27 | 1993-09-29 | Utsui Co., Ltd. | Molded pulp product and production process thereof |
JPH08209600A (ja) * | 1994-11-28 | 1996-08-13 | Toomoku:Kk | 繊維材料から成る円筒体及びその製造方法 |
JPH08302600A (ja) * | 1995-05-11 | 1996-11-19 | Imamura Shoten:Kk | シートボトル |
-
1999
- 1999-05-06 DE DE69942126T patent/DE69942126D1/de not_active Expired - Lifetime
- 1999-05-06 WO PCT/JP1999/002366 patent/WO1999057373A1/ja active Application Filing
- 1999-05-06 EP EP99918322A patent/EP1126083B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54133972A (en) * | 1978-04-05 | 1979-10-18 | Dainippon Printing Co Ltd | Combined container and making method thereof |
EP0562590A1 (en) * | 1992-03-27 | 1993-09-29 | Utsui Co., Ltd. | Molded pulp product and production process thereof |
JPH08209600A (ja) * | 1994-11-28 | 1996-08-13 | Toomoku:Kk | 繊維材料から成る円筒体及びその製造方法 |
JPH08302600A (ja) * | 1995-05-11 | 1996-11-19 | Imamura Shoten:Kk | シートボトル |
Non-Patent Citations (1)
Title |
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See also references of EP1126083A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022138563A1 (ja) * | 2020-12-25 | 2022-06-30 | 凸版印刷株式会社 | パルプモールド成形品及びその製造方法 |
WO2023232995A1 (de) * | 2022-06-03 | 2023-12-07 | Alpla Werke Alwin Lehner Gmbh & Co. Kg | Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling |
CH719750A1 (de) * | 2022-06-03 | 2023-12-15 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Verfahren und Vorrichtung zur Reduktion des Wassergehaltes in einem faserbasierten Rohling. |
GB2620390A (en) * | 2022-07-04 | 2024-01-10 | Pulpex Ltd | Method and system for forming a receptacle |
Also Published As
Publication number | Publication date |
---|---|
EP1126083A4 (en) | 2005-12-21 |
DE69942126D1 (de) | 2010-04-22 |
EP1126083A1 (en) | 2001-08-22 |
EP1126083B1 (en) | 2010-03-10 |
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