WO2000003859A1 - Produit en resine moulee, de faible poids, et son procede de fabrication - Google Patents
Produit en resine moulee, de faible poids, et son procede de fabrication Download PDFInfo
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- WO2000003859A1 WO2000003859A1 PCT/JP1999/003845 JP9903845W WO0003859A1 WO 2000003859 A1 WO2000003859 A1 WO 2000003859A1 JP 9903845 W JP9903845 W JP 9903845W WO 0003859 A1 WO0003859 A1 WO 0003859A1
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- WIPO (PCT)
- Prior art keywords
- fiber
- molded product
- resin
- resin molded
- mold
- Prior art date
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Classifications
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1705—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/1723—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using fibre reinforcements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/2457—Parallel ribs and/or grooves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24744—Longitudinal or transverse tubular cavity or cell
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249971—Preformed hollow element-containing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249986—Void-containing component contains also a solid fiber or solid particle
Definitions
- the present invention relates to a lightweight resin molded product and a method for producing the same, and in particular, while having a reduced weight, has particularly excellent properties in rigidity, bending strength, impact strength, uniformity of strength, and resistance to local stress and torsion.
- the present invention relates to a fiber-containing lightweight resin molded product having excellent appearance and having an excellent appearance, and an efficient production method thereof.
- Fiber-reinforced resin molded articles reinforced by incorporating fibers such as glass fibers have been known.
- This fiber-reinforced resin molded product is excellent in mechanical properties such as tensile strength and bending strength and heat resistance, so it can be used as an instrument panel, a bumper beam, a door step, a Nora'e rack, a rear quota panel, and an air-acre.
- Lina Auto parts such as cases, chassis of electrical products such as radios, televisions and videos, housing parts such as computers, printers, and copiers, and panels for exterior walls, panels for partition walls, shelves, and cable troughs. Widely used as furniture for 'architecture' and civil engineering materials.
- an injection molding method for injecting a molten resin containing fibers into a mold can be used. According to this injection molding method, it is possible to mold even a complicated shape, and since a predetermined molding cycle can be continuously repeated, the same shape can be mass-produced. There is.
- the mold transferability is sweet, and silver leaks and the like are generated, and the strength, strength, rigidity, etc., of the molded product cannot be sufficiently secured because the appearance of the molded product is impaired. There are cases.
- the molded product obtained by the molding method described in (1) or (2) above may be There are problems such as insufficient bending strength and rigidity, and limited use of molding raw materials.
- the degree of weight reduction is high, for example, when the expansion rate exceeds 2 times, if the internal structure is a structure with uniform voids, the density is extremely low in the center of the molded product in the thickness direction. And may not always contribute sufficiently to bending deformation and bending stiffness.
- the manufacturing method (3) a light-weight molded article having no surface protrusions and excellent surface characteristics can be obtained.
- An object of the present invention is to provide a wide range of applications in which a wide range of molding raw materials can be selected, and even in a large-area molded product having a hollow portion, there is no reduction in rigidity and strength, a good appearance, and a wide control range of weight reduction. It is an object of the present invention to provide a lightweight resin molded article applicable to a molded article and an efficient production method thereof.
- the present inventors have conducted intensive studies on the raw material resin and the molded article, the weight reduction of the molded article, and the internal structure and physical properties of the molded article in the gas injection molding method.
- the preferred internal structure of the fiber-containing molded article is a case where the voids do not form hollow portions and are formed substantially uniformly.
- the molding conditions for forming the above structure are very narrow, and it may be difficult to obtain the above structure stably. Therefore, the density of the inside of the molded product, particularly in the central portion in the thickness direction, becomes extremely low depending on the formed product and the like, and sufficient strength and rigidity cannot be obtained.
- a fiber-containing molten thermoplastic resin made of a specific fiber-containing resin molding material is injected or injection-compressed into the mold cavity, and then the volume of the mold cavity is increased.
- gas By injecting gas into the molten resin after the start of expansion, it was found that a lightweight resin molded product having excellent rigidity, strength and appearance can be efficiently manufactured.
- a hollow resin molded product formed of a thermoplastic resin having a fiber content of 10 to 70% by weight, and a lightweight resin molded product having a reinforcing rib structure in a hollow portion.
- the lightweight resin molded article according to the above item 3 wherein the voids are dispersed air-permeable voids. 5.
- a molding die having rib forming means inject or inject and compress a fiber-containing molten thermoplastic resin made of a fiber-containing molding resin material having an average fiber length of 2 to 50 mm into the mold cavity, and then mold A hollow molded product made of 10 to 70% by weight of fiber-containing thermoplastic resin in which the volume of the mold cavity is expanded and gas is injected into the molten resin after the expansion is started.
- the hollow rib has a reinforcing rib structure. Manufacturing method of lightweight resin molded products.
- the fiber-containing molten thermoplastic resin has a total length of 2 to 5 Omm, a length equal to the total length, and fibers arranged in parallel to each other.
- a fiber-containing molten thermoplastic resin made of a fiber-containing molding resin material having an average fiber length of 2 to 50 mm has a blowing agent added to 100 parts by weight of the fiber-containing resin.
- FIG. 1 is a conceptual diagram of a first embodiment of the present invention, in which (A) shows a state before the volume of the injection mold is increased, and (B) shows a state after the expansion.
- FIGS. 2A and 2B are conceptual diagrams of a skin integral molding according to a second embodiment of the present invention.
- FIG. 2A shows a state before the volume of the injection mold is enlarged
- FIG. 2B shows a state after the enlargement. is there.
- the lightweight resin molded product of the present invention and the method for producing the same will be described based on an example of the production method.
- a fiber-containing molten thermoplastic resin made of a specific molding resin material is injected and filled into a mold cavity, and then the volume of the mold cavity is increased, and gas is introduced into the molten resin.
- a mold having a rib-forming ability is used to form a reinforcing rib in a hollow portion. That is, in the first embodiment and the second embodiment of the present invention, a similar effect can be obtained by the expansion due to the springback phenomenon caused by the entanglement of the containing fibers without substantially using the foaming agent.
- a rib structure is formed in the hollow portion, so that the rigidity and strength can be significantly increased.
- the method for producing a lightweight resin molded product according to the first embodiment and the second embodiment of the present invention comprises forming a hollow portion by expanding a molten resin by gas injection in response to expansion of a mold cavity. Therefore, the weight of the molded product is reduced. This weight reduction is based on the fact that the weight of the entire molded product is fixed by the capacity of the cavity when the molten resin is filled in the molding die, but the shape of the hollow molded product with a rib structure is The effect is to have much higher rigidity and strength while maintaining the same weight, which can contribute, for example, to lighter weight and resource saving of automobiles.
- the present inventors have already proposed a method for producing a lightweight resin molded product utilizing the springback phenomenon of a fiber-containing resin, as described above.
- the feature of this method is that the whole molded product adopts the expanded structure of the fiber-containing resin.
- the method for producing a lightweight resin molded article of the present invention solves the above-mentioned problem by utilizing the expansion characteristics of the fiber-containing resin to reduce the weight of the molded article and to form a rib structure inside the molded article. .
- a hollow structure is formed as a molded article, that is, as a means for selectively forming a hollow structure without expanding the whole.
- the reason is that the fiber-containing resin starts to expand due to the expansion of the mold cavity, starts gas injection from the initial stage, and further increases the speed of expansion of the mold cavity, increases the gas injection speed, And it is achieved by increasing the gas flow rate. Therefore, the degree of weight reduction can be arbitrarily controlled and the degree of expansion of the fiber-containing resin part can be controlled by selecting molding materials and selecting molding conditions.
- the above method can reduce the weight, but the hollow part is merely an effect of reducing the weight.
- a molded product whose expansion is three times or more cannot withstand actual use in terms of rigidity and strength. It will be.
- the mold structure for forming the rib structure is not particularly limited, and any means can be adopted in consideration of the shape of the molded product.
- an example of a manufacturing method for forming a rib structure will be described.
- the present invention expands the mold cavity volume by using a movable mold (core) having a plurality of cavity forming surfaces capable of moving back and forth with respect to the cavity.
- the moving mold (core) has a simple shape, that is, a cavity, whereas a single flat moving mold is almost uniform.
- a molded article having a planar structure having a hollow portion of one thickness is obtained.
- the surface portion of the mold cavity is cooled to form a non-expandable skin layer, and the resin molded product has high strength and rigidity despite its light weight.
- the rigidity is insufficient when the surface volume is large, and the resistance to local stress and torsion may be insufficient.
- the skin layers on both surfaces are joined by reinforcing ribs made of fiber-containing resin.
- a mold provided with a movable mold (having a plurality of moving parts) having a plurality of cavity forming surfaces capable of moving back and forth with respect to the mold cavity. Then, the molten thermoplastic resin containing a specific molding resin material is injected into the mold cavity where the cavity forming surface of the movable mold is at the projecting position where the clearance is left, and then the volume of the mold cavity is reduced. The moving mold is retracted in the direction of enlargement.
- the shape and number of the moving parts (cores) constituting the cavity forming surface are appropriately determined according to the size of the molded product, required characteristics, and the like.
- the protruding state of the plurality of moving parts is also appropriately determined in the same manner, but in general, a position having an appropriate clearance between the opposing mold surface in consideration of the expansion ratio of the molded product is set. Is done. After the mold cavity starts to expand, gas such as nitrogen is injected into the fiber-containing molten resin in the cavity. By expanding the mold cavity, the fiber-containing molten resin expands in the initial stage of cavity expansion, and then a good hollow portion is formed by injecting gas.
- the outer periphery and the center of the molded product have the same mold cavities in advance when the resin is filled, and gas is easily injected into the retracted portion of the movable mold, and the formation of a hollow portion is ensured.
- the injected gas not only increases the volume of the hollow part but also presses the fiber-containing molten resin toward the mold forming surface, so that the resin is cooled in a state in which the resin is in close contact with the mold surface. No sink marks are formed on the surface of the molded product.
- this gas is circulated through the mold, cooling of the molded article is promoted and the molding cycle is improved. At this time, if a liquid such as volatile water is entrained, the cooling effect is further improved.
- a fiber-containing thermoplastic resin having an average fiber length of 2 to 50 mm and a fiber content of 10 to 70% by weight is used as a molding material resin.
- the fiber-containing thermoplastic resin has a total length of 2 to 5 Omm, a length equal to the total length, and a fiber content containing 20 to 80% by weight of fibers arranged in parallel with each other. It is preferable to use a molding raw material in which the fiber is a mixture of a thermoplastic resin pellet and another pellet and the fiber accounts for 10 to 70% by weight of the whole.
- the other pellet is usually a thermoplastic resin or a resin containing various additives, but for example, a pellet obtained by melting and kneading glass fiber or the like may be used. By selecting this molding material, the spring back phenomenon is better exhibited.
- the ribs are formed on the lightweight resin molded product, and the molding die means is not limited to the case where the expansion ratio of the lightweight resin molded product is relatively large. In many cases, the ribs need not have a dense structure. In this case, not only the hollow part but also the rib part has a lightweight structure having voids due to expansion, so that a lighter molded product can be obtained. Therefore, the means for forming the ribs can also be achieved by designing a molding die so that the ribs are formed in the hollows. For example, in a molding process, there is a method of forming a convex portion on at least one of the fixed mold and the movable mold.
- the convex The part cools faster than the other general parts, increases the melt viscosity, hinders expansion and forms ribs.
- the concave portion is formed in the fixed mold or the movable mold, the amount of resin in the corresponding portion increases, and a portion corresponding to the rib can be formed.
- the ribs are formed at any position and shape, such as a linear shape, a lattice shape, and an independent shape, and can be appropriately selected from the product design of the lightweight resin molded product.
- the formation of the hollow portion can be controlled by selecting the gas injection conditions, it can also be controlled by controlling the expansion speed of the cavity, that is, the retracting speed of the movable mold and the movable mold.
- the retreat speed is in the range of 1 to 200 mm ns, preferably in the range of 2 to 100 O mm.
- the lightweight resin molded article of the present invention has a fiber content of 10 to 70% by weight, preferably 15 to 60% by weight. If the content is less than 10% by weight, the expandability, strength, rigidity and heat resistance are not sufficient, and if the content is more than 70% by weight, the fluidity at the time of melting is reduced, resulting in poor appearance, swellability and moldability. There are cases.
- the fiber glass fiber is preferable, and the average fiber length in the molded article is 0.2 to 20 mm, particularly preferably 2 to 15 mm.
- FIG. 1 is a conceptual diagram showing a first embodiment of the method for producing a lightweight resin molded product of the present invention.
- FIG. 2 conceptually shows a second embodiment of the method for producing a lightweight resin molded product of the present invention.
- 1 is a fixed mold
- 2 is a movable mold
- 3 is a movable mold
- 4 is a movable mold protrusion
- 5 is a mold cavity
- 6 is a sprue
- 7, 8 is a gas inlet
- 10a, 10b, and 10c are parts of the lightweight resin molded product.
- (A) shows the state before the fiber-containing molten resin is injected and the volume of the injection mold is expanded
- (B) shows the state after the volume of the injection mold is expanded. .
- the method for manufacturing a lightweight resin molded product of the present invention according to the first embodiment of the present invention shown in FIG. 1 is as follows. First, a fixed mold 1 and a movable mold 2 are clamped, and a moving mold having a plurality of protrusions is further provided. The mold 3 is projected into the cavity 5 to determine the mold cavity volume at the time of injection. In this case, the tip of the protruding portion of the movable mold is set to have a clearance D1 in the thickness direction of the molded product.
- the shape of the clearance D1 and the movable mold (projection) can be appropriately determined depending on the shape of the final molded product, the degree of weight reduction, and the like.
- the molten thermoplastic resin containing fibers is injected and filled from the nozzle of the plasticizer (not shown) through the sprue 6 to the cavity 5 in this state, and the mold surface is reliably transferred by the injection resin pressure.
- the injected molten resin begins to cool from the part where it contacts the mold.
- the retreating of the movable mold 3 is started, and as shown in Fig. 1 (B), the position is increased to the position of D2, that is, the cavity volume to be the final molded product.
- Inject gas The gas may be injected together with the start of the retreat of the moving mold 3.
- the fiber-containing thermoplastic resin in a molten state expands due to the resilience due to the entanglement of the contained fibers.
- gas is selectively injected into the inflated portion, a hollow portion is formed, and a final molded product having a reinforcing rib in the hollow portion is formed. Is pressed against the mold wall and shaped.
- the retreat of the movable mold is performed in the range of:! To 200 mm / sec, preferably 2 to 100 mm / sec. After cooling, the gas is released, the mold is opened, and the lightweight resin molded product is removed.
- a movable mold other than the outer peripheral portion of the mold for example, having a plurality of moving portions in the central portion is projected into the cavity to inject the molten resin, and the molten resin is injected.
- the resin is also cooled in a part where a flat structure is formed, which is a general part of the method.
- the movable mold is retracted, the molten resin is expanded, and a gas is injected to form a hollow portion.
- the lightweight resin molded product not only the hollow portion 10c but also the dense region of the fiber-containing resin, that is, the reinforcing rib 10b, is provided not only in the outer peripheral portion 10a but also in the center portion of the molded product. It is formed.
- a regulating valve is provided at one of the gas inlets to serve as a gas outlet, and while maintaining the pressure at the gas outlet at a certain pressure, discharge and distribute the gas to promote cooling of the molded product. You can also do it.
- Another manufacturing method of the lightweight resin molded product according to the second embodiment of the present invention shown in FIG. 2 is as follows. First, the fixed mold 1 and the movable mold 2 are clamped to reduce the cavity volume at the time of injection. decide. In this case, the position of the movable mold 2 with respect to the main part of the fixed mold 1 is set to be a clearance D 1 in the thickness direction of the molded product.
- the feature of this embodiment is that a concave portion 11 is formed on the mold surface of the fixed mold 1. Further, the gas injection nozzle is provided so as to avoid this concave portion.
- the shape of the clearance D1 and the concave portion can be appropriately determined according to the shape of the final molded product, the degree of weight reduction, and the like. Fiber 5 containing molten thermoplastic resin is shown for cavity 5 in this state It is injected and filled from the nozzle of the plasticizing device via sprue 16, and the mold surface is reliably transferred by the injected resin pressure.
- the injected molten resin begins to cool from the point of contact with the mold. Then, the retreat of the movable mold 3 was started, and as shown in Fig. 2 (B), the cavity volume was expanded to the position of D2, that is, the position to be the final molded product. Inject nitrogen gas more than 8. The gas may be injected together with the start of the retreat of the movable mold 3. Due to the retreat of the movable mold 3, the fiber-containing thermoplastic resin in a molten state expands due to the resilience due to the entanglement of the contained fibers, and the amount of resin in the mold concave portion is large, and compared to other parts As a result, the expansion ratio is reduced, and the rib portion can be formed.
- the reinforcing rib composed of the low expansion region formed according to the shape of the concave portion on the mold surface is arbitrary, such as an independent linear shape, a continuous linear shape, or a lattice shape, depending on the shape of the molded product.
- thermoplastic resin used in the present invention is not particularly limited, and examples thereof include, for example, polypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer, and polyethylene.
- Polyolefin resin, polystyrene resin, ABS resin, polychlorinated vinyl resin, polyamide resin, polyester resin, polyacetal resin, polycarbonate resin, polyaromatic or thioether resin, polyaromatic Aromatic ester resins, polysulfone resins, acrylate resins, and the like can be used.
- the above thermoplastic resins can be used alone or in combination of two or more.
- thermoplastic resins polypropylene resins such as polypropylene, block copolymers of propylene and other olefins, random copolymers, or mixtures thereof, Polyamide resins are preferred, especially acids modified with unsaturated carboxylic acids or their derivatives. A polypropylene resin containing a modified polyolefin resin is preferred.
- fillers such as impact modifiers such as various elastomers, stabilizers, antistatic agents, weathering agents, coloring agents, short fibers, and talc may be added to these thermoplastic resins as necessary. Can also. If the fiber is too short to recover, add a gas generating agent such as a foaming agent.
- the fibers include ceramic fibers: porone fiber, silicon carbide fiber, alumina fiber, silicon nitride fiber, zirconia fiber, inorganic fiber: glass fiber, carbon fiber, metal fiber: copper fiber, Brass fiber, steel fiber, stainless fiber, aluminum fiber, aluminum alloy fiber, organic fiber: polyester fiber, polyamide fiber, polyarylate fiber and the like can be exemplified.
- the fiber length in the forming raw material is preferably about 0.2 to 50 mm from the viewpoint of formability.
- the raw material pellets are those obtained by melting and kneading chopped strands and thermoplastic resin into pellets, and the total length of fiber-containing molded resin raw materials is 2 to 50 mm.
- a fiber-containing thermoplastic resin pellet having the same length as the entire length and containing 20 to 80% by weight of fibers arranged in parallel with each other, or the pellet and the other pellet.
- the fiber is a molding resin material in which the fibers are 10 to 70% by weight of the whole, and preferably the whole is 2 to 5 Omm and has a length equal to the total length.
- Thermoplastic resin pellets containing 20 to 80% by weight of fibers arranged in parallel to each other are preferred. If the pellets are arranged in parallel to each other and contain 20 to 80% by weight of the whole, plasticizing, melting, and kneading with the screw of the injection device can be performed. Breakage is unlikely to occur and dispersibility is also good. As a result, spattering of the fiber-containing molten resin in the cavity The ringback phenomenon becomes better, the fiber length remaining in the final molded product becomes longer, and the physical properties and surface appearance are improved. In addition, as a plasticizing screw of an injection molding machine, use of a type having a relatively low compression ratio is preferable from the viewpoint of suppressing fiber breakage.
- the glass fiber is a glass fiber such as E-glass or S-glass having an average fiber diameter of 25 / m or less, preferably in the range of 3 to 20 ⁇ . Can be employed favorably. If the diameter of the glass fiber is less than 3 ⁇ m, the glass fiber does not fit into the resin during pellet production, making it difficult to impregnate the resin.If the diameter exceeds 20 / m, the appearance is reduced. In addition to making it difficult for the fibers to flow into details such as ribs and ribs, cutting and chipping are more likely to occur during melt kneading.
- the glass fibers are surface-treated with a coupling agent, and then subjected to a binding agent by a sizing agent. It is desirable to bundle them in 100,000 lines, preferably in the range of 150 to 500,000 lines.
- the coupling agent can be appropriately selected from so-called silane coupling agents and titanium-based coupling agents that have been conventionally used.
- silane coupling agents and titanium-based coupling agents that have been conventionally used.
- Aminosilanes such as ethyltrimethoxysilane can be used.
- a urethane type, an olefin type, an acryl type, a butadiene type, an epoxy type and the like can be used, and among these, a urethane type and an olefin type can be preferably used.
- Ureta The oil-based sizing agent is usually an oil-modified sizing agent as long as it contains 50% by weight or more of polysocyanate obtained by a polyaddition reaction between a diisocyanate compound and a polyhydric alcohol.
- any of a one-part type such as a moisture-curable type and a block type, and a two-part type such as a catalyst-curable type and a polyol-curable type can be adopted.
- a modified polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof can be used as the olefin sizing agent.
- thermoplastic resin By attaching and impregnating a thermoplastic resin to the glass fibers converged by the sizing agent as described above, a resin pellet containing glass fibers is produced.
- a method of attaching and impregnating a thermoplastic resin to glass fiber for example, a method of passing a fiber bundle through a molten resin and impregnating the fiber with the resin, a method of impregnating the fiber with a fiber bundle through a coating die, or For example, a method in which the molten resin adhered around the fibers by a dicing method is spread and impregnated into the fiber bundle can be adopted.
- the tension is applied to the fiber bundle by pulling it through the fiber bundle inside the die with the unevenness on the inner periphery.
- a pultruding method can be adopted in which the molten resin is applied to the textile market, and the process is completed by pressing the textile machine at the IT market. If the glass fiber and the molten resin are compatible with each other and have good wettability, the molten resin can be easily impregnated into the glass fiber and the pellet can be easily produced. The step of converging may be omitted in some cases.
- a method of allowing the two to be compatible with each other it is effective to impart a polarity to the resin or to graft a functional group that reacts with the force-printing agent on the surface of the glass fiber.
- a long fiber bundle (strand, etc.) impregnated with resin is cut along the longitudinal direction of the fiber by the above method, it will be the same as the entire length of the pellet.
- a resin pellet containing long fibers can be obtained.
- the resin pellets are not limited to cut fiber-contained long fiber bundles whose fiber bundles are made into strands and the cross-sectional shape of which is approximately circular. Accordingly, a resin-containing long fiber bundle in a sheet, tape or band shape may be cut to a predetermined length.
- the gas to be injected into the fiber-containing molten resin in the cavity is not particularly limited, and usually an inert gas such as nitrogen or argon at room temperature is used.
- an inert gas such as nitrogen or argon at room temperature
- a cooling gas having a temperature of 15 ° C. or less, preferably 0 ° C. or less can be used.
- the gas is opened to any one of a gas nozzle provided inside a nozzle of an injection device for plasticizing and injecting the molten resin, or a sprue, a runner and a cavity provided inside the mold. It can be injected into the fiber-containing molten resin from the gas pin to be opened.
- the pressure of the gas is preferably set in the range of 0.2 to 30 MPa, particularly preferably in the range of 1 to 2 OMPa.
- the pressure value of the gas to be injected depends on the size of the molded product, the shape and expansion ratio, and the fluidity, viscosity and fiber content of the molten resin, and the gate shape of the mold. It is set according to.
- gas injection is possible even at relatively low pressure even at relatively low pressure even at relatively low pressure is that it is performed after the mold cavity has begun to expand, and the resin is injected into the area where the resin has expanded in advance by using the fiber springback phenomenon. That's why. Therefore, the possibility of gas leaking between the surface of the molten resin and the molding surface of the mold and the occurrence of appearance defects such as silver mark streak are reduced. Cooling line for molded products In the PT process, gas can be discharged and cooled to cool the resin after shaping in a short time. Another reason that gas injection at a relatively low pressure is possible is that, due to the inclusion of fibers, when the molten resin foams, the foam cell walls become gas permeable, facilitating gas dispersion throughout the molded article.
- the injected gas essentially contributes to the formation of voids and the formation of a hollow portion, but it is preferable that the injected gas is flowed and discharged as a secondary factor in the mold transferability in the molding of a molded article and the cooling process.
- the molded resin can be cooled in a short time. In other words, the cooling of the molded article can be promoted by discharging the gas while keeping the pressure at the gas outlet at a certain pressure.
- a skin material for covering and integrating the surface of the molded product can be attached to the mold before molding.
- a mold having a skin material attached before molding a lightweight resin laminate molded product whose surface is covered with the skin material can be obtained.
- the skin material include cloth such as woven fabric and nonwoven fabric, thermoplastic resin sheet and film, foamed sheet of thermoplastic resin, and single-layer material such as film printed with a pattern or the like.
- a multilayer material in which a lining material composed of a thermoplastic resin or a foam sheet of a thermoplastic resin is used as a skin material such as a thermoplastic elastomer or a vinyl chloride resin can be used.
- the skin material can be entirely coated on the molded product or can be partially coated.
- a general injection molding method is employed for injecting the fiber-containing molten thermoplastic resin into the mold cavity.
- the melt flow during injection melt fluidity due to fiber content, etc.
- the size of the molten resin flow length of the molten resin
- prevention of resin orientation, etc. insufficient resin is injected to satisfy the mold cavity, and then the movable mold, moving mold, etc. are advanced.
- an injection compression molding method in which the molten resin is compressed and completely filled. In some cases, it is preferable to use the injection compression molding method for the integral molding method of the skin.
- the composition of the fiber-containing foamable thermoplastic resin used in the present invention includes 90 to 30% by weight of the thermoplastic resin and 10 to 70% by weight of the fiber, and preferably 80 to 40% by weight. Consists of 20% by weight of thermoplastic resin and 20 to 60% by weight of fiber. The selection of these compounding amounts is appropriately determined based on the type of thermoplastic resin, melt viscosity, type of fiber, fiber diameter, fiber length, thickness and shape of the molded product, physical properties required for the molded product, and the like.
- the foaming agent for converting the fiber-containing thermoplastic resin into a foamable resin is not particularly limited, and a suitable foaming agent may be selected and used depending on the melting temperature of each resin.
- foaming agents include oxalic acid derivatives, azo compounds, hydrazine derivatives, semicarbazides, azide compounds, nitroso compounds, triazoles, urine and its related compounds, nitrites, hydrides, carbonates and the like.
- Bicarbonate can be used.
- azodicarbonamide ADCA
- benzenesulfohydrazide N, N-dinitropentamethylenetetramine, terephthalazide, and the like
- physical blowing agents include pentane, butane, fluorine compounds, and water.
- foaming agents may contain a molding raw material pellet and a predetermined amount of a foaming agent, or may be added in advance as a masterbatch of the foaming agent and a thermoplastic resin.
- the foaming agent contains 100 parts by weight of the fiber-containing thermoplastic resin. In general, the amount is in the range of 0.5 to 10 parts by weight, preferably 1 to 10 parts by weight.
- the amount of the foaming agent added is to secure the expandability of the mold cavity volume at the time of the initial expansion, and when the expandability is not caused by the contained fibers, a relatively large amount is used. Therefore, it is not always necessary that the fiber length in the molten resin is particularly long, and the range of selection of molding materials is expanded. Further, if necessary, stabilizers, antistatic agents, weathering agents, coloring agents, fillers such as talc, and impact modifiers such as various elastomers can be added.
- the lightweight resin molded article of the present invention has a hollow portion made of a thermoplastic resin having a fiber content of 10 to 70% by weight, and has a reinforcing rib structure in the hollow portion.
- the hollow portion may be a plurality of hollow portions separated by a reinforcing rib structure, or a structure in which a plurality of hollow ribs are distributed.
- the light-weight resin molded product of the present invention has a fiber content of 10 to 70% by weight, a porosity of 25 to 70% by weight, and air-permeable voids dispersed therein.
- it is a lightweight resin molded article having a fiber content of 10 to 70% by weight, a porosity of 25 to 95%, and a hollow portion.
- the air-permeable void means a structure through which gas can entirely pass, although a clear void is not clearly formed inside the lightweight resin molded product.
- the lightweight resin molded article of the present invention has expandability due to the inclusion of fibers even in the main body portion made of a fiber-containing resin other than the hollow part. In some cases, the main body also contains fine voids.
- the overall porosity including the hollow portion that is, the resin cavity, the mold cavity volume at the time of filling, and the final Approximate by the extent of expansion to the volume of the mold cavity at the completion of expansion to become a molded product
- the fibers in the molded article glass fibers are preferable, and those having an average fiber length in the range of 1 to 20 mm are preferable.
- Examples of the lightweight resin molded product of the present invention include an instrument panel core, a bumper beam, a door panel, a door step, a roof 'rack, a rear' quarter panel, an air cleaner.
- a case various kinds of villas, ceiling materials, an engine cover and the like.
- Parts, housings and parts for electrical products such as radios, televisions, and video cameras, housings and parts for computers, printers, and copiers.
- the effects of the present invention will be described based on specific examples, but the present invention is not limited to these examples.
- Glass fiber (1 3 / m) is arranged in parallel, its content is 7 5 wt%, glass fiber reinforced and a length of 1 2 mm poly pro Pirenpere' preparative (3 wt maleic anhydride-modified polypropylene 0 / 0 containing) 6 0 wt 0/0 and Mel preparative index (M l: 2 3 0.C, 2. 1 6 kg load) force 3 0 8 1 0 minutes polypropylene Perret Tsu DOO 4 0 wt 0/0 drives Len Into a molded resin material.
- the injection molding machine used a screw with a mold clamping force of 850 t and a compression ratio of 1.9 to reduce breakage of the glass fiber. As shown in Fig.
- the protrusion 4 of the movable mold 3 protrudes into the cavity 5 (clearance of the fixed mold and the protrusion of the movable mold (D1)).
- the die was positioned at 3 mm.
- the molding resin material was melted, plasticized, weighed, injected and filled so as to have a volume equivalent to the mold cavity volume.
- the moving mold 3 starts to retract at a very high speed of 50 mm, sec.
- Nitrogen gas of Pa gas flow rate 2 liter-second
- the retraction is to the final molded product position (D2: 12 mm) as shown in Fig. 1 (B).
- degassing is performed, and the movable mold 2 is opened to mold the lightweight resin. The shape was removed.
- the obtained lightweight resin molded product was free of sink marks and had good smoothness.
- the combined porosity of the hollow space and the fine voids was about 85%.
- a hollow portion was formed in a region of the molded product where the movable die 3 receded.
- the center part which is the cavity formed by the protrusion of the movable mold at the time of resin injection, is formed of a rather dense part with a low porosity, and has a function as a reinforcing rib substantially.
- the product had excellent rigidity. When no gas was injected, the surface smoothness was poor due to sink marks.
- Glass fiber (13 ⁇ ) is arranged in parallel, its content is 60% by weight, and glass fiber reinforced polyamide resin (6,6 Nippon) with a length of 12 mm is 70% by weight.
- a 30 wt% polyamide resin (6.6 nylon) was used as a raw material for molding.
- the injection molding machine used a screw having a mold clamping force of 850 t and a compression ratio of 1.9 in order to reduce breakage of the glass fiber.
- a molding die as shown in FIG. 2 (A), a die having two linear concave portions 11 on the die surface of the fixed die 1 was used. The movable mold 2 was moved forward, and the mold was positioned so that the clearance (D 1) of the cavity 5 was 4 mm.
- Injection units (not shown) were used to melt, plasticize, weigh and inject the molding materials into a volume equivalent to the volume of the mold cavity.
- the movable mold 2 starts retreating at a very fast speed of 30 mm, sec. Nitrogen gas (gas flow rate: 2 liter / sec) was injected into the molten resin at 15 MPa from three gas pins. The retreat is to the final molded product position (D2: 20 mm) as shown in Fig. 2 (B).
- degassing is performed, and the movable mold 2 is opened to open the lightweight resin.
- the molded article was taken out.
- the obtained lightweight resin molded product was free of sink marks and had good smoothness.
- the porosity of the hollow space and the fine voids was about 79%.
- a hollow portion was formed in a region of the molded product where the movable die 3 receded.
- the center part which is the cavity formed by the protrusion of the movable mold at the time of resin injection, is formed of a rather dense part with a low porosity, and has a function as a reinforcing rib substantially.
- the product had excellent rigidity.
- a foaming agent Polyslen E115 (manufactured by Eiwa Chemical Co., Ltd. (master batch with a foaming agent content of 11% by weight)) was added and blended. This was used as raw material for molding.
- the injection molding machine used was a screw with a mold clamping force of 850 t and a compression ratio of 2.8. went.
- the molding die consists of a fixed die 1, a movable die 2, and a movable die 3 that slides through the movable die 2.
- a tee 4 was used.
- the movable mold 2 is clamped and the movable mold 3 is moved forward, so that the cavity clearance (D1) between the protrusion 4 of the movable mold 3 and the fixed mold 1 is increased.
- the mold was positioned to 3 mm.
- the molding material was then melted, plasticized, weighed, injected, and filled so that the mold cavity had a thickness of 3 mm.
- Fig. 1 (B) Three seconds after the end of filling, as shown in Fig. 1 (B), the movable mold 3 was retracted and the cavity was extended to a position where the final molded product thickness became 15 mm. At this time, after the retreat of the movable mold 3 was started, nitrogen gas was injected at 15 MPa from two gas injection pins provided in the fixed mold. After waiting for cooling, the mold was opened and the lightweight resin molded product was removed.
- the obtained lightweight resin molded product had no surface sink and had high smoothness. Near the gate, silver streaks were slightly observed.
- the lightweight resin molded product is composed of a substantially dense mold surface, a slightly low density part inside and around the center and two hollow parts, and the overall porosity (including the space part) was about 80%.
- the cooling time during which no sink marks were formed in the molded product was about 120 seconds. Even when the molded product was placed on a jig with a span of 500 mm and a load of 50 Kg was applied to the center, no substantial deformation was observed.
- the degree of weight reduction In addition to being able to control, it can maintain excellent strength characteristics and surface properties even for molded products with a high weight reduction rate, and can improve productivity by shortening the cooling time and shortening the molding cycle.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/508,091 US6623838B1 (en) | 1998-07-16 | 1999-07-16 | Lightweight resin molded product and production method thereof |
EP99929872A EP1023981A4 (en) | 1998-07-16 | 1999-07-16 | LIGHT OBJECT FROM SYNTHETIC RESIN AND METHOD FOR THE PRODUCTION THEREOF |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10201023A JP2000033627A (ja) | 1998-07-16 | 1998-07-16 | 軽量樹脂成形品の製造方法および軽量樹脂成形品 |
JP10201024A JP2000033628A (ja) | 1998-07-16 | 1998-07-16 | 軽量樹脂成形品およびその製造方法 |
JP10/201024 | 1998-07-16 | ||
JP10/201023 | 1998-07-16 |
Publications (1)
Publication Number | Publication Date |
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WO2000003859A1 true WO2000003859A1 (fr) | 2000-01-27 |
Family
ID=26512535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/003845 WO2000003859A1 (fr) | 1998-07-16 | 1999-07-16 | Produit en resine moulee, de faible poids, et son procede de fabrication |
Country Status (3)
Country | Link |
---|---|
US (1) | US6623838B1 (ja) |
EP (1) | EP1023981A4 (ja) |
WO (1) | WO2000003859A1 (ja) |
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US6724118B2 (en) * | 2001-06-13 | 2004-04-20 | Siemens Westinghouse Power Corporation | Electrical isolation layer system strand assembly and method of forming for electrical generator |
US20030087081A1 (en) * | 2001-11-02 | 2003-05-08 | Seiling Kevin A. | Composition for making extruded shapes and a method for making such composition |
AUPR982502A0 (en) * | 2002-01-03 | 2002-01-31 | Pax Fluid Systems Inc. | A heat exchanger |
CN1612979B (zh) * | 2002-01-03 | 2011-11-23 | 百思科技公司 | 涡环发生器 |
AUPR982302A0 (en) | 2002-01-03 | 2002-01-31 | Pax Fluid Systems Inc. | A fluid flow controller |
JP3687964B2 (ja) * | 2002-09-24 | 2005-08-24 | アイ・アンド・ピー株式会社 | 伝動装置用サンドイッチ成形可動ガイド |
AU2003903386A0 (en) * | 2003-07-02 | 2003-07-17 | Pax Scientific, Inc | Fluid flow control device |
WO2005045258A1 (en) * | 2003-11-04 | 2005-05-19 | Pax Scientific, Inc | Fluid circulation system |
CN1985093A (zh) * | 2004-01-30 | 2007-06-20 | 百思科技公司 | 用于离心通风机、泵或涡轮机的机罩 |
JP4695097B2 (ja) * | 2004-01-30 | 2011-06-08 | パックス サイエンティフィック インコーポレイテッド | 遠心ファン、ポンプまたはタービンのハウジング |
US7838095B2 (en) * | 2005-06-17 | 2010-11-23 | Illinois Tool Works, Inc. | Corrugated polymeric void board |
JP4569417B2 (ja) * | 2005-08-23 | 2010-10-27 | 宇部興産機械株式会社 | 熱可塑性樹脂の射出発泡成形方法 |
WO2008042251A2 (en) | 2006-09-29 | 2008-04-10 | Pax Streamline, Inc. | Axial flow fan |
US20080083800A1 (en) * | 2006-10-10 | 2008-04-10 | Mathson Industries | Roof railing assembly |
DE102006049415B8 (de) * | 2006-10-16 | 2023-12-28 | Pme Fluidtec Gmbh | Verfahren und Vorrichtung zur Herstellung eines einen Hohlraum mit mindestens zwei Abschnitten oder mehrere Hohlräume aufweisenden Bauteils aus Kunststoff |
DE102011105775B4 (de) * | 2011-06-24 | 2016-01-14 | Wittmann Battenfeld Gmbh | Verfahren zum Spritzgießen von Kunststoff-Formteilen aus thermoplastischem Kunststoff |
WO2015003238A1 (en) | 2013-07-09 | 2015-01-15 | Fly Technologies Inc. | Controlled formation of cellular material and apparatus |
US11273585B2 (en) | 2015-09-04 | 2022-03-15 | Sabic Global Technologies B.V. | Process for producing longer fibers in injection molded solid parts by dissolving of gas during plasticizing |
US11639030B2 (en) * | 2017-02-03 | 2023-05-02 | Mimaki Engineering Co., Ltd. | Manufacturing method and shaping device for shaped object |
DE102017222539A1 (de) * | 2017-12-12 | 2019-06-13 | Elringklinger Ag | Formgebungswerkzeug und Verfahren zur Herstellung von Werkstücken |
CN111331775A (zh) * | 2020-04-07 | 2020-06-26 | 海信视像科技股份有限公司 | 电视底座及其制造方法、电视机 |
CN113085146A (zh) * | 2021-03-19 | 2021-07-09 | 石志强 | 一种塑料工件侧边型吹塑成型快速顶出装置 |
CN114851460B (zh) * | 2022-04-25 | 2023-06-20 | 蜂巢能源科技股份有限公司 | 渐变弹性材料及其生产模具和生产方法以及方型电池 |
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- 1999-07-16 US US09/508,091 patent/US6623838B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP1023981A1 (en) | 2000-08-02 |
US6623838B1 (en) | 2003-09-23 |
EP1023981A4 (en) | 2004-06-02 |
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