WO2010032678A1 - 圧縮成形方法及び装置 - Google Patents
圧縮成形方法及び装置 Download PDFInfo
- Publication number
- WO2010032678A1 WO2010032678A1 PCT/JP2009/065850 JP2009065850W WO2010032678A1 WO 2010032678 A1 WO2010032678 A1 WO 2010032678A1 JP 2009065850 W JP2009065850 W JP 2009065850W WO 2010032678 A1 WO2010032678 A1 WO 2010032678A1
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- WIPO (PCT)
- Prior art keywords
- compression molding
- compression
- mold
- mold member
- side wall
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
- B29C2043/3613—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons applying pressure locally
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/20—Opening, closing or clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7132—Bowls, Cups, Glasses
Definitions
- the present invention relates to a compression molding method and apparatus for compressing a soft or molten synthetic resin material to form a cup-shaped product such as a container having a bottom wall and a cylindrical side wall extending from the periphery of the bottom wall. About.
- a cup-shaped product such as a food and drink container having a bottom wall and a cylindrical side wall extending from the periphery of the bottom wall is formed by compression molding an appropriate synthetic resin such as polypropylene or polyethylene.
- compression molding as disclosed in Patent Documents 1 and 2 below, molding having a male mold means constituted by a single mold member and a female mold member constituted by a single mold member.
- a compression molding apparatus including a mold means and a mold opening / closing means is used. When the mold means is in the open state, the synthetic resin material in the softened or molten state is supplied to the male mold means or the female mold means, and then compression pressure is applied to the mold means by the mold opening / closing means, and thus the synthetic resin material is cupped. Molded into a shaped product.
- the conventional compression molding method and apparatus for compression molding cup-shaped products have the following problems to be solved.
- the synthetic resin material that is compressed and allowed to flow is cooled early at the side wall portion, the fluidity is hindered, and the synthetic resin material is It does not flow sufficiently well to the tip of the side wall, and this tends to cause molding defects.
- it is necessary to make the compression pressure excessive the compression molding apparatus becomes heavy and expensive, and the compression molding cost is also expensive.
- the present invention has been made in view of the above facts, and its main technical problem is that excessive compression pressure is required even when the product is relatively large or when it is desired to make the side wall sufficiently thin. And to provide a new and improved compression molding method and apparatus that allows a cup-shaped product to be compression molded as required.
- the present inventors separately performed compression molding of the bottom wall and the main portion excluding the tip of the side wall and compression molding of the side wall tip in the cup-shaped product, The present inventors have found that the above main problem can be achieved by performing compression molding of the front end portion of the side wall after the compression molding with the main portion excluding the front end portion of the side wall.
- a compression molding method for achieving the main technical problem a softened or molten synthetic resin material is compressed and a cylinder extending from the periphery of the bottom wall and the bottom wall is compressed.
- a first compression molding step of compression molding the bottom wall and a main portion excluding the tip of the side wall; and a second compression molding step of compression molding the tip of the side wall The second compression process is started after the start of the first compression molding process, In the first compression step, the synthetic resin material is caused to flow beyond the main part of the side wall, In the second compression molding step, the synthetic resin material that has flowed beyond the main portion of the side wall is compression molded.
- a compression molding method is provided.
- a compression molding apparatus for molding a cup-shaped product having a side wall, A mold means including male mold means and female mold means, and a mold opening / closing means for opening and closing the mold means,
- One of the male mold means and the female mold means is a first mold member that defines the bottom wall and a main portion excluding the tip of the side wall, and a second that defines the tip of the side wall.
- a mold member of A compression molding apparatus is provided.
- the compression pressure in the second compression molding step is preferably smaller than the compression pressure in the first compression molding step.
- the female mold means has the first mold member and the second mold member, and the male mold means is constituted by a single mold member.
- the mold opening / closing means is a first pressurizing means for applying a compression pressure to the first mold member, and an application of the compression pressure by the first pressurizing means.
- a second pressurizing means for applying a compression molding pressure to the second mold member with a delay.
- the compression pressure by the second pressurizing means is preferably smaller than the compression pressure by the first pressurizing means.
- the mold opening / closing means is connected to the one of the male mold means and the female mold means via a movable base, and the first mold member Is connected to the movable base via compression spring means, and the second mold member is fixed to the movable base.
- a typical example of a cup-shaped product is a container, and the tip of the side wall includes an annular flange.
- an excessive compression pressure can be applied even when the product is relatively large or when it is desired to make the side wall sufficiently thin.
- the cup-shaped product can be compression molded as required.
- Sectional drawing which shows the typical example of the container compression-molded by the compression molding method and apparatus of this invention Sectional drawing which shows the main component of suitable embodiment of the compression molding apparatus comprised according to this invention in the mold open state. Sectional drawing which shows the main component of the compression molding apparatus shown in FIG. 2 in the state by which the 1st compression molding process was performed. Sectional drawing which shows the main component of the compression molding apparatus shown in FIG. 2 in the state by which the 2nd compression molding process was performed. Sectional drawing which shows the main component of other suitable embodiment of the compression molding apparatus comprised according to this invention in the mold open state. Sectional drawing which shows the main component of the compression molding apparatus shown in FIG. 5 in the state by which the 1st compression molding process was performed.
- FIG. 5 Sectional drawing which shows the main component of the compression molding apparatus shown in FIG. 5 in the state by which the 2nd compression molding process was performed.
- FIG. 1 shows a container which is a typical example of a cup-shaped product compression-molded by the compression molding method and apparatus of the present invention.
- the container denoted as a whole by the number 2 is composed of a bottom wall 4 and a side wall 6.
- the bottom wall 4 is circular in a bottom view, and has a central portion 8 protruding upward and a substantially flat annular outer peripheral portion 10.
- the side wall 6 extending upward from the periphery of the bottom wall 4 has a substantially inverted truncated cone shape as a whole.
- An annular shoulder 12 facing downward is formed at the tip or upper end of the side wall 6, and the diameter of the main portion 14 below the annular shoulder 12 is gradually increased upward.
- FIG. 2 shows the main components of a preferred embodiment of a compression molding apparatus constructed according to the present invention for compression molding the container 2 (in FIG. 2 and FIGS. 3 to 7 to be described later).
- a container to be compression-molded and a molding cavity of such a container are illustrated somewhat schematically, and the shape of the container 2 in FIGS. 2 to 7 is slightly different from the shape of the container 2 in FIG.
- the illustrated compression molding apparatus includes male means 20 and female means 22.
- the male mold means 20 is composed of a single mold member 24.
- the mold member 24 fixed on the stationary base 25 includes the inner surface of the bottom wall 4, the main portion 14 of the side wall 6, and the inner surface of the annular shoulder 12.
- the inner surface of the short cylindrical portion 16 and the upper surface of the annular flange 18 are defined.
- the female mold means 22 is composed of a first mold member 26 and a second mold member 28.
- the first mold member 26 is fixed to the lower surface of the movable base 30.
- a first pressurizing means 31 that can be constituted by a hydraulic cylinder mechanism.
- a molding cavity 32 is formed at the center of the lower surface of the first mold member 26.
- the molding cavity 32 is formed on the outer surface and the side wall of the bottom wall 4 of the container 2. 6 defines the outer surface of the main part 14.
- a flat annular surface 34 surrounding the molding cavity 32 exists on the lower surface of the first mold member 26, and the annular surface 34 defines the outer surface of the annular shoulder 12 of the side wall 6.
- the second mold member 28 has a cylindrical shape as a whole, and is fixed to the inner peripheral surface of the movable auxiliary base 36 having an annular disk shape.
- An annular shoulder surface 38 facing downward is formed on the inner peripheral surface of the second mold member 28, and as will be clearly understood from the following description, the annular shoulder surface 38 is the annular flange 18 of the container 2.
- the cylindrical inner peripheral surface above the annular shoulder surface 38 defines the outer peripheral surface of the short cylindrical portion 16 of the container 2, and the upper end of the cylindrical inner peripheral surface below the annular shoulder surface 38.
- the part defines the outer peripheral surface of the annular flange 18 of the container 2.
- a second pressurizing means 40 is attached to the movable auxiliary base 36.
- the second pressurizing means 40 constitutes a mold opening / closing means together with the first pressurizing means 31.
- the second pressurizing means 40 is composed of two hydraulic cylinder mechanisms 42 disposed on the upper surface of the movable auxiliary base 36 with an angular interval of 180 degrees.
- Each of the hydraulic cylinder mechanisms 42 includes a cylinder 44 and a piston 46.
- the lower surface of the cylinder 44 is fixed to the upper surface of the movable auxiliary base 36.
- the rod 48 of the piston 46 passes through the upper end wall of the cylinder 44 and extends upward, and the extended end is connected to the base 30 via a circular connecting plate 50.
- the piston head side and the piston rod side of the cylinder 44 are selectively connected to a pressure oil outlet and a pressure oil reservoir of the oil / air pressure converter 52 via an appropriate communication path (not shown).
- the male mold means 20 in the mold open state in which the female mold means 22 is spaced upward from the male mold means 20.
- the softened or molten synthetic resin material 54 is supplied onto the upper surface of the mold member 24.
- the synthetic resin material 54 may be an appropriate synthetic resin such as polypropylene or polyethylene.
- the piston rod side of the cylinder 44 is connected to the pressure oil outlet of the hydraulic / pneumatic converter 52.
- the piston 46 is in the lowest lowered position with respect to the cylinder 42.
- the movable base 30 is lowered to the position shown in FIG. 3 by the action of the first pressurizing means 31 (first compression step).
- first pressurizing means 31 first compression step
- the first mold member 26 of the female mold means 22 is positioned at a required closed position with respect to the mold member 24 of the male mold means 20, and the synthetic resin material 54 is compressed to form the first mold member 24 and the first mold member 24.
- the molding space defined between the mold member 26 and the mold member 26 is caused to flow, whereby the main portion 14 of the side wall 6 is molded together with the bottom wall 4 of the container 2.
- the second mold member 28 of the female mold member 22 has not yet been lowered to the predetermined closed position with respect to the mold member 24 of the male mold means 20, and the mold member 24 and the second mold member 28.
- the synthetic resin material 54 that can flow in the molding space defined between the mold member 24 and the first mold member 26 is the width of the molding space that is allowed to flow (that is, the main portion of the side wall 6 of the container 2). 14 is relatively small, or even if the synthetic resin material 54 is cooled to a relatively low temperature and its fluidity is reduced, as clearly understood from the experimental examples to be described later, the tip of the fluid space is Since the mold member 24 and the second mold member 28 are opened to a relatively large space that is not yet closed, the mold member 24 and the second mold member 28 are allowed to flow well without requiring excessive compression pressure. A part is allowed to flow beyond the main portion 14 of the side wall 6 of the container 2 into a relatively large space that is not yet closed between the mold member 24 and the second mold member 28.
- the piston rod side is connected to the pressure oil reservoir, and the piston head side is connected to the pressure oil outlet (second compression molding step).
- the cylinder 44 is lowered with respect to the piston 46 fixed to the movable base 30, whereby the second mold member 28 of the female mold means 22 is moved to the male mold means 20.
- the portion of the side wall 6 of the container 2 excluding the main portion 14 between the mold member 24 and the second mold member 28, that is, the short cylindrical portion. 16 and the annular flange 18 are compression molded.
- the compression pressure by the second pressurizing means 40 may be considerably smaller than the compression pressure by the first pressurizing means 32.
- the movable base 30 is raised, the female mold means 22 is separated upward from the male mold means 20 to be in the mold open state, and the compression molded container 2 is taken out.
- the piston head side of the cylinder 44 is connected to the pressure oil reservoir, and the piston rod side of the cylinder 44 is connected to the pressure oil outlet, whereby the hydraulic cylinder The mechanism 42 is returned to the state shown in FIG.
- FIG. 5 shows the main components of another preferred embodiment of a compression molding apparatus constructed according to the present invention for compression molding the container 2.
- the first mold member 126 of the female mold means 122 is connected to the movable base 130 via compression spring means composed of a plurality of compression spring members 125.
- the movable auxiliary base 136 to which the second mold member 128 of the female mold means 122 is fixed is movable bases via a plurality of connecting column members 127 arranged outside the first mold member 126. 130 is fixed.
- the second pressurizing means is not provided. Except for the above-described configuration of the embodiment illustrated in FIG. 5, the embodiment is substantially the same as the embodiment illustrated in FIG.
- the movable base 130 is lowered to the position shown in FIG. 6 by the action of the first pressurizing means 131 (first compression step).
- first compression step the first mold member 126 of the female mold means 122 is positioned at the required closed position with respect to the mold member 124 of the male mold means 120, and the synthetic resin material 54 is compressed to form the first mold member 124 and the first mold member 124.
- the molding space defined between the mold member 126 and the mold member 126 is caused to flow, whereby the main portion 14 of the side wall 6 is molded together with the bottom wall 4 of the container 2.
- the second mold member 128 of the female mold member 122 has not yet been lowered to the predetermined closed position with respect to the mold member 124 of the male mold means 120, and the mold member 124 and the second mold member 128. There is a relatively large space between them.
- the synthetic resin material 54 that can flow in the molding space defined between the mold member 124 and the first mold member 126 is flowed well without the need for excessive compression pressure, and the A part is discharged beyond the main part 14 of the side wall 6 of the container 2 into a relatively large space that is not yet closed between the mold member 124 and the second mold member 128.
- the operation of the first pressurizing means 131 is delayed for a predetermined time (for example, 0.2 to 0.4 seconds) from the execution of the first compression process described above or subsequently to the execution of the first compression process described above.
- a predetermined time for example, 0.2 to 0.4 seconds
- the movable base 130 is lowered to the position shown in FIG. 7 (second compression step).
- the first mold member 126 of the female mold means 122 is not lowered, so that the compression spring member 125 is gradually compressed as the movable base 130 is lowered. .
- the second mold member 128 of the female mold means 122 is lowered in response to the lowering of the movable base 130, and is positioned at a predetermined closed position with respect to the mold member 124 of the male mold means 120, thus forming the mold member.
- a portion excluding the main portion 14 of the side wall 6 of the container 2, that is, the short cylindrical portion 16 and the annular flange 18 are compression-molded between 124 and the second mold member 128.
- the lowering pressure of the second mold member 128 in the second compression step is such that a part of the applied pressure of the first pressurizing means 131 is consumed for the compression of the compression spring member 125, and therefore the first compression step. It is smaller than the descending pressure of the first mold member 126 in FIG.
- the movable base 130 is raised and the female mold means 122 is separated upward from the male mold means 120 to be in the mold open state (in this case, the compression spring member 125 is elastically restored and the first mold member 126 is restored. Is lowered relative to the movable base 130), and the compression molded container 2 is taken out.
- the female mold means is composed of two members, a first mold member and a second mold member, but instead of or in addition to this, the male mold means Can be composed of two members, a first mold member and a second mold member.
- Experimental example 1 A container having a configuration as illustrated in FIG. 1 was compression-molded using a compression molding apparatus as illustrated in FIGS.
- the supply amount (weight per unit area) of the synthetic resin material (polypropylene at 220 to 230 ° C.) was 4.7 g.
- the temperature of the mold member of the male mold means and the temperature of the first mold member and the second mold member of the female mold means were set to 60 ° C.
- the displacement of the first mold member and the second mold member and the fluctuation of the compression load in the female means at the time of compression molding were measured, it was as shown in FIG.
- the dimensions of each part of the compression molded container are as shown in FIG.
- FIG. 1 A container as illustrated in FIG. 1 was compression molded using a compression molding apparatus as illustrated in FIGS.
- a container having a shape as shown in FIG. 1 can be compression-molded by varying the supply amount of the synthetic resin material (polypropylene at 220 to 230 ° C.) and the first compression load by the first pressurizing means. I tried to do it.
- Annular flange when the temperature of the mold member of the male mold means and the first mold member and the second mold member of the female mold means is set to 60 ° C. and 25 ° C. during compression molding
- the conditions under which the container having the shape shown in FIG. 1 could be compression-molded without generating so-called sinks and shorts were as shown in FIG.
- Comparative Experiment Example 1 The experiment was conducted except that the first mold member and the second mold member in the female mold means were integrally formed, and the compression molding apparatus in which the movable auxiliary base and the second pressurizing means were omitted was used. In the same manner as in Example 2, it was attempted whether or not a container having a shape as shown in FIG. When the temperature of the first mold member and the second mold member formed integrally with the male mold means and the female mold means at the time of compression molding is set to 60 ° C. and when set to 25 ° C. The conditions under which the container having the shape as shown in FIG. 1 could be compression-molded were as shown in FIG.
- Experimental example 3 A container as shown in FIG. 1 was compression-molded under the two conditions shown in FIG. 11 using a compression molding apparatus as shown in FIGS.
- the synthetic resin material was polypropylene at 220 to 230 ° C.
- the wall thickness of the compression molded container was measured at a plurality of sites, it was as shown in FIG.
- Comparative Experiment Example 2 The experiment was performed except that a compression molding apparatus in which the first mold member and the second mold member in the female mold means were integrally formed and the movable auxiliary base and the second pressurizing means were omitted was used. In the same manner as in Example 3, compression molding was performed under the two conditions shown in FIG. When the wall thickness of the compression molded container was measured at a plurality of sites, it was as shown in FIG.
- FIG. 1 A container as shown in FIG. 1 is compressed using a compression molding apparatus as shown in FIGS. 2 to 4, and the supply amount of synthetic resin material (polypropylene at 220 to 230 ° C.) and the first pressurizing means are used. It was investigated whether or not the container as shown in FIG. 1 could be compression-molded without causing so-called sinks and shorts in the annular flange.
- the temperature of the mold member of the male mold means and the temperature of the first mold member and the second mold member of the female mold means were set to 25 ° C. The result was as shown in FIG.
- Comparative Experiment Example 3 The experiment was conducted except that the first mold member and the second mold member in the female mold means were integrally formed, and the compression molding apparatus in which the movable auxiliary base and the second pressurizing means were omitted was used. In the same manner as in Example 4, it was examined whether or not a container as illustrated in FIG. 1 could be compression molded. The result was as shown in FIG.
- the thickness of the bottom wall and the side wall of the container can be reduced and the weight of the container can be reduced (Experimental Example 2). It is understood that Comparative Experimental Example 1 and Experimental Example 3 and Comparative Experimental Example 2), and also that the compression molding load can be reduced (Experimental Example 4 and Comparative Experimental Example 3).
- Container 4 Container bottom wall 6: Side wall of container 20: Male mold means 22: Female mold means 26: First mold member in female mold means 28: Second mold member in female mold means 32: First pressurizing means 40: Second pressurizing means 120: Male mold means 122: Female mold means 126: First mold member in female mold means 128: Second mold member in female mold means 125: Compression spring member (compression spring means)
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Abstract
Description
該底壁と該側壁の先端部を除く主部とを圧縮成形する第一の圧縮成形工程と、該側壁の該先端部を圧縮成形する第二の圧縮成形工程とを含み、
該第一の圧縮成形工程の開始に遅れて該第二の圧縮工程を開始し、
該第一の圧縮工程においては該側壁の該主部を超えて合成樹脂素材を流動せしめ、
該第二の圧縮成形工程においては該側壁の主部を超えて流動せしめられた合成樹脂素材を圧縮成形する、
ことを特徴とする圧縮成形方法が提供される。
雄型手段及び雌型手段を含む成形型手段と該成形型手段を開閉せしめるための型開閉手段とを含み、
該雄型手段と該雌型手段とのいずれか一方は該底壁と該側壁の先端部を除く主部とを規定する第一の成形型部材と該側壁の該先端部を規定する第二の成形型部材とを有する、
ことを特徴とする圧縮成形装置が提供される。
図1に図示するとおりの形態の容器を図2乃至4に図示するとおりの圧縮成形装置を使用して圧縮成形した。合成樹脂素材(220乃至230℃のポリプロピレン)の供給量(目付量)は4.7gであった。圧縮成形の際には雄型手段の成形型部材並びに雌型手段の第一の成形型部材及び第二の成形型部材の温度を60℃に設定した。圧縮成形の際の雌型手段における第一の成形型部材及び第二の成形型部材の変位及び圧縮荷重の変動を測定したところ図8に示すとおりであった。また、圧縮成形した容器の各部寸法は図9に示すとおりであった。
図1に図示するとおりの容器を図2乃至図4に図示するとおりの圧縮成形装置を使用して圧縮成形した。合成樹脂素材(220乃至230℃のポリプロピレン)の供給量及び第一の加圧手段による第一の圧縮荷重を種々に変動せしめて、図1に図示するとおりの形状の容器を圧縮成形することができるか否かを試みた。圧縮成形の際に雄型手段の成形型部材並びに雌型手段の第一の成形型部材及び第二の成形型部材の温度を60℃に設定した場合及び25℃に設定した場合の、環状フランジに所謂ヒケ及びショートを生成せしめることなく図1に図示するとおりの形状の容器を圧縮成形することができた条件は図10に示すとおりであった。
雌型手段における第一の成形型部材と第二の成形型部材とを一体に形成し、可動補助基台及び第二の加圧手段を省略した圧縮成形装置を使用したことを除いて、実験例2と同様にして図1に図示するとおりの形状の容器を圧縮成形することができるか否かを試みた。圧縮成形の際に雄型手段の成形型部材並びに雌型手段の一体に形成した第一の成形型部材及び第二の成形型部材の温度を60℃に設定した場合及び25℃に設定した場合の、図1に図示するとおりの形状の容器を圧縮成形することができた条件は図10に示すとおりであった。
図1に図示するとおりの容器を図2乃至図4に図示するとおりの圧縮成形装置を使用して、図11に示すとおりの2種の条件で圧縮成形した。合成樹脂素材は220乃至230℃のポリプロピレンであった。圧縮成形した容器の壁厚を複数個の部位で測定したところ図11に示すとおりであった。
雌型手段における第一の成形型部材と第二の成形型部材とを一体に形成し、可動補助基台及び第二の加圧手段を省略した圧縮成形装置を使用したことを除いて、実験例3と同様にして、図11に示すとおりの2種の条件で圧縮成形した。圧縮成形した容器の壁厚を複数個の部位で測定したところ図11に示すとおりであった。
図1に図示するとおりの容器を図2乃至図4に図示するとおりの圧縮成形装置を使用し、合成樹脂素材(220乃至230℃のポリプロピレン)の供給量及び第一の加圧手段による第一の圧縮荷重を変動せしめて、環状フランジに所謂ヒケ及びショートを生成せしめることなく図1に図示するとおりの容器を圧縮成形することができるか否かを検討した。圧縮成形の際に雄型手段の成形型部材並びに雌型手段の第一の成形型部材及び第二の成形型部材の温度を25℃に設定した。その結果は図12に示すとおりであった。
雌型手段における第一の成形型部材と第二の成形型部材とを一体に形成し、可動補助基台及び第二の加圧手段を省略した圧縮成形装置を使用したことを除いて、実験例4と同様にして、図1に図示するとおりの容器を圧縮成形することができるか否かを検討した。その結果は図12に示すとおりであった。
4:容器の底壁
6:容器の側壁
20:雄型手段
22:雌型手段
26:雌型手段における第一の成形型部材
28:雌型手段における第二の成形型部材
32:第一の加圧手段
40:第二の加圧手段
120:雄型手段
122:雌型手段
126:雌型手段における第一の成形型部材
128:雌型手段における第二の成形型部材
125:圧縮ばね部材(圧縮ばね手段)
Claims (9)
- 軟化乃至溶融状態の合成樹脂素材を圧縮して、底壁と該底壁の周縁から延出する筒状側壁とを有するカップ状製品を成形する圧縮成形方法にして、
該底壁と該側壁の先端部を除く主部とを圧縮成形する第一の圧縮成形工程と、該側壁の該先端部を圧縮成形する第二の圧縮成形工程とを含み、
該第一の圧縮成形工程の開始に遅れて該第二の圧縮工程を開始し、
該第一の圧縮工程においては該側壁の該主部を超えて合成樹脂素材を流動せしめ、
該第二の圧縮成形工程においては該側壁の主部を超えて流動せしめられた合成樹脂素材を圧縮成形する、
ことを特徴とする圧縮成形方法。 - 該第二の圧縮成形工程における圧縮圧力は該第一の圧縮成形工程における圧縮圧力よりも小さい、請求項1記載の圧縮成形方法。
- カップ状製品は容器であり、該側壁の該先端部は環状フランジを含む、請求項1又は2記載の圧縮成形方法。
- 軟化乃至溶融状態の合成樹脂素材を圧縮して、底壁と該底壁の周縁から延出する筒状側壁とを有するカップ状製品を成形する圧縮成形装置にして、
雄型手段及び雌型手段を含む成形型手段と該成形型手段を開閉せしめるための型開閉手段とを含み、
該雄型手段と該雌型手段とのいずれか一方は該底壁と該側壁の先端部を除く主部とを規定する第一の成形型部材と該側壁の該先端部を規定する第二の成形型部材とを有する、
ことを特徴とする圧縮成形装置。 - 該雌型手段が該第一の成形型部材と該第二の成形型部材とを有し、該雄型手段は単一の成形型部材から構成されている、請求項4記載の圧縮成形装置。
- 該型開閉手段は該第一の成形型部材に圧縮圧力を付加する第一の加圧手段と、該第一の加圧手段による圧縮圧力の付加に遅れて該第二の成形型部材に圧縮成形圧力を付加する第二の加圧手段とを含む、請求項4又は5記載の圧縮成形装置。
- 該第二の加圧手段による圧縮圧力は該第一の加圧手段により圧縮圧力よりも小さい、請求項4又は5記載の圧縮成形装置。
- 該型開閉手段は可動基台を介して該雄型手段と該雌型手段との該一方に接続されており、該第一の成形型部材は圧縮ばね手段を介して該可動基台に接続されており、該第二の成形型部材は該可動基台に固定されている、請求項4又は5記載の圧縮成形装置。
- カップ状製品は容器であり、該側壁の該先端部は環状フランジを含む、請求項4から8までのいずれかに記載の圧縮成形装置。
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