WO2011148879A1 - プリフォームの口部結晶化方法 - Google Patents
プリフォームの口部結晶化方法 Download PDFInfo
- Publication number
- WO2011148879A1 WO2011148879A1 PCT/JP2011/061712 JP2011061712W WO2011148879A1 WO 2011148879 A1 WO2011148879 A1 WO 2011148879A1 JP 2011061712 W JP2011061712 W JP 2011061712W WO 2011148879 A1 WO2011148879 A1 WO 2011148879A1
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- WIPO (PCT)
- Prior art keywords
- mouth
- preform
- top surface
- crystallization
- core
- Prior art date
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/76—Neck calibration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
-
- 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
- B65D1/023—Neck construction
-
- 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
- B65D1/023—Neck construction
- B65D1/0246—Closure retaining means, e.g. beads, screw-threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0266—Local curing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
- B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
- B29C49/6452—Thermal conditioning of preforms characterised by temperature differential through the preform length by heating the neck
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/68—Ovens specially adapted for heating preforms or parisons
- B29C49/685—Rotating the preform in relation to heating means
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
- B29K2105/258—Tubular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0041—Crystalline
Definitions
- the present invention relates to a method for crystallizing a preform mouth.
- the wide-mouthed container has a large ratio of the outer diameter of the mouth part to the outer diameter of the body part with respect to a narrow-mouthed container such as a PET (polyethylene terephthalate) bottle that is widely used in general beverage containers.
- a container of 45 mm or more is called a wide-mouth container.
- the wide-mouthed container is easy to take out the filling material, and therefore the filling material is not limited to a liquid but is often used for a solid material container such as a jam.
- the wide-mouth container uses a top seal that seals at the top of the mouth when capping. Therefore, the deformation of the top surface of the mouth must be as small as possible in order to improve the sealing performance.
- a wide-mouthed container that is filled at a high temperature needs to crystallize the mouth part to have a high density and ensure heat resistance.
- the volume is reduced as the density is increased, so that the mouth is likely to be deformed. It is necessary to prevent the deformation from adversely affecting the top surface of the mouth.
- Patent Documents 1 and 2 The mouth crystallization method in which the mouth is heated from inside and outside is disclosed in Patent Documents 1 and 2, and the deformation of the mouth of the narrow mouth container is disclosed in Patent Documents 3 to 5.
- Patent Documents 1 and 2 the core is inserted into the mouth of the narrow mouth preform, and the mouth of the narrow mouth preform is heated from inside and outside.
- the 2nd heating source which heats the heat conductor (21) which is a part of core extended outside the mouth part (22) is provided, and heat from the second heating source (22) is transmitted to the core to heat the mouth also from the inside (see FIG. 7).
- Patent Document 2 excludes the second heating source (22) of Patent Document 1, changes the portion of the thermal conductor (21) of Patent Document 1 to a fin (12a), heats the mouth from the outside, The heat retained in the core for internal heating is radiated through the fins (12a) to harmonize the internal and external heating (see FIG. 4).
- Patent Document 1 we are interested in the temperature gradient between the inner and outer walls of the mouth (see FIGS. 5 and 6), and in Patent Document 2, the temperature between the inner and outer walls is kept constant by combining rapid heating from the outside and heat radiation by the fins. (See 0058).
- both the Patent Documents 1 and 2 are indifferent about the temperature change from room temperature to the crystallization temperature maintenance.
- Some aspects of the present invention provide a mouth crystallization method capable of shortening the crystallization time and heating the mouth from inside and outside and controlling the mouth to an appropriate crystallization temperature that does not cause overheating. Objective.
- One embodiment of the present invention provides: A method of crystallizing the mouth part of a preform having a mouth part, a body part and a bottom part, Inserting a core into the mouth; Heating the mouth by a heater group arranged along the transport direction while rotating the preform with the core inserted into the mouth and transporting along the transport direction; Cooling the mouth of the preform with the core inserted;
- the heating step includes A first step of driving, with a first power, a first heater group located upstream of the transport direction in the heater group; Among the heater groups, the second heater group positioned downstream of the first heater group is a second power smaller than the first power until the mouth reaches the crystallization temperature band.
- a second process driven by: It is characterized by including.
- the crystallization time is shortened, and the mouth does not exceed the crystallization temperature zone and is not overheated. Can be.
- overheating occurs in the latter half of the heating step even if the crystallization time can be shortened.
- the crystallization time is extended even if the crystallization temperature can be controlled.
- the crystallization time can be shortened by rapid heating to a temperature that does not reach the crystallization temperature zone in the first step.
- a step of transporting the preform without heating may be included between the first step and the second step.
- the temperature of the mouth of the preform tends to drop once. Therefore, at the start of the second step, the influence of rapid heating in the first step can be suppressed. As a result, immediately after the start of the second step, the temperature rise characteristic of the mouth portion of the preform can be more easily inclined than in the first step.
- a third heater group located downstream of the second heater group is driven with a third power smaller than the second power
- the method may further include a third step of maintaining the temperature of the mouth portion in the crystallization temperature range.
- the temperature of the mouth is easily maintained in the crystallization temperature zone by further powering down the heater power. Thus, overheating of the mouth can be suppressed.
- the third power of the third heater group in the third step, can be further powered down downstream from the upstream side in the transport direction.
- the temperature of the mouth portion is maintained in the crystallization temperature band by maintaining the temperature rising rate or decreasing the temperature rising rate by powering down toward the downstream side. it can.
- the method may further include a step of preheating the core before inserting the core into the mouth portion.
- the outer surface temperature of the mouth and the temperature of the core can be made substantially equal, and the temperature difference between the inside and outside of the mouth can be sufficiently relaxed, reducing the first time. Also contribute.
- Another aspect of the present invention is a synthetic resin wide-mouthed container having a mouth portion, a trunk portion, and a bottom portion, and a top surface of the mouth portion sealed by a lid attached to the mouth portion.
- the mouth is Mouthpiece, An engaged portion that is formed to protrude outward from the mouth tube portion and to which the lid is engaged, A flange protruding outward from the mouth tube portion on the top surface side, and a protrusion height from the mouth tube portion lower than the engaged portion; and Including
- the top surface of the mouth portion is formed with an enlarged area between the first top surface of the mouth tube portion and the second top surface of the flange that is flush with the first top surface, The flange is thinner than the mouthpiece, The mouth is crystallized.
- the sealing area is increased by the enlarged top surface
- the flange has a resin density on the top surface side due to the resin pressure in the resin flow direction during injection molding. Enhanced. Therefore, the enlarged top surface is reduced in deformation at the time of crystallization, and can improve the tight sealing property with the lid.
- this flange can be used as a member that is engaged with a chuck that conveys the preform and prevents the displacement of the preform in the axial direction.
- the flange has a facing surface facing the second top surface, and the resin density on the second top surface side is higher than the resin density on the facing surface side. Can do.
- deformation of the top surface of the flange used for the seal can be suppressed by deforming the opposing surface side having a low density during crystallization of the mouth.
- Still another aspect of the present invention is a synthetic resin wide-mouthed container having a mouth portion, a body portion, and a bottom portion, and a top surface of the mouth portion sealed by a lid attached to the mouth portion.
- the mouth is The mouthpiece, An engaged portion that is formed to protrude outward from the mouth tube portion and to which the lid is engaged, A ring-shaped concave portion formed in the mouth tube portion on the trunk portion side with respect to the engaged portion; and It is characterized by including.
- the ring-shaped concave portion is formed to be recessed from the mouth tube portion, so that the amount of preform resin can be reduced. If the volume of the mouth portion is reduced, the volume shrinkage during crystallization of the mouth portion is also reduced, so that deformation of the top surface of the mouth portion can be suppressed and the top surface sealing property is improved. Further, the ring-shaped recess can be used as a member that is engaged with a chuck that conveys the preform and prevents the positional displacement of the preform in the axial direction.
- the engaged portion has N (N is an integer of 2 or more) threads, and the N threads are N in the circumferential direction of the mouth tube section.
- N is an integer of 2 or more
- Each of the N divided regions can be formed in a range of less than 360 ° / N.
- each of the N threads is inclined from the start end of the first height position toward the top surface side of the mouth portion in the axial direction of the mouth tube portion. It can have a second position extended as a terminal.
- each of the N divided regions has the same height at the start and end, so that the height of the mouthpiece portion can be reduced. Its volume can be reduced. Since the volume shrinkage at the time of crystallization of the mouth is also reduced, deformation of the top surface of the mouth can be suppressed, and the top surface sealing property is improved.
- FIG. 1 is a front view of a wide-mouth container according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a lid that is attached to the mouth of the wide-mouth container of FIG.
- FIG. 3 is a cross-sectional view showing an example of the mouth portion of the wide-mouth container shown in FIG. 1 and a chuck that supports the mouth portion.
- 4 is a cross-sectional view showing another example of the mouth portion of the wide-mouth container shown in FIG. 1 and a chuck that supports the mouth portion.
- FIG. 5 is a partial cross-sectional view showing a preform injection molding process for the wide-mouth container shown in FIG.
- FIG. 6 is a front view of the wide-mouth container according to the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view of the mouth portion of the wide-mouth container shown in FIG.
- FIG. 8 is an end view showing the threads of the container shown in FIGS. 1 and 6.
- 9 (A) to 9 (D) are diagrams showing main steps of the mouth crystallization method.
- FIG. 10 is a characteristic diagram showing the transition of the surface temperature of the mouth and the temperature of the core in one cycle.
- FIG. 11 is a plan view schematically showing the mouth crystallization apparatus.
- FIG. 1 is a front view of a wide-mouth container according to a first embodiment of the present invention
- FIG. 2 is a cross-sectional view of a lid attached to the mouth portion of the wide-mouth container of FIG. 4 is a cross-sectional view of the mouth portion and the chuck that supports the mouth portion.
- a wide mouth container 10A made of a synthetic resin (for example, polyethylene terephthalate) has a mouth portion 20A, a trunk portion 30, and a bottom portion 40, and a mouth portion 20A by a lid 90 (see FIG. 2) attached to the mouth portion 20A.
- the top surface 21A is sealed.
- a cap called a twist-off cap or a lug cap can be used as the lid 90 attached to the mouth portion 20A of the wide-mouth container 10A.
- the cap 90 is formed in a bottomed cylindrical shape as shown in FIG. 2, and a plurality of, for example, four engaging portions (lugs) 92 protruding from the inner peripheral surface 91 of the cylindrical portion, and a seal portion 93 located on the bottom surface.
- the seal portion 93 may be thin and have elasticity, or may be formed by sticking an elastic seal material.
- the mouth portion 20A has a mouth tube portion 22 and a plurality of engaged portions 23 that are formed to protrude outward from the mouth tube portion 22 and to which the plurality of engaging portions 92 of the lid 90 are respectively engaged.
- the engaged portion 23 can be formed by, for example, a screw thread.
- the mouth portion 20 ⁇ / b> A further has a flange 24 that protrudes outward from the mouth tube portion 22 on the top surface 21 ⁇ / b> A side, and the protrusion height from the mouth tube portion 22 is lower than that of the engaged portion 23.
- the mouth portion 20A can further include a support ring (also referred to as a neck ring) 25, but the support ring 25 is not an essential configuration as described later.
- the top surface 21A of the mouth portion 20A has an enlarged area formed by the first top surface 22A of the mouth tube portion 22 and the second top surface 24A of the flange 24 that is flush with the first top surface 22A.
- the surface (lower surface) facing the second top surface 24A of the flange 24 is referred to as a facing surface 24B.
- a thickness T2 between the second top surface 24A and the opposing surface 24B of the flange 24 is thinner than a thickness T1 of the mouth tube portion 22 (T1> T2).
- the mouth portion 20A is whitened and crystallized. An example of the crystallization method will be described later.
- the mouth portion 20A of the wide mouth container 10A eliminates the need for a locking ring (also referred to as a bead ring) required for the narrow mouth container, so that the total height of the mouth portion 20A from the top surface 21A to the lower surface of the support ring 25 is, for example
- the amount of preform resin for blow molding the container 10A can be reduced accordingly. If the volume of the mouth portion 20A is reduced, the volume shrinkage during whitening crystallization is also reduced, so that deformation of the top surface 21A of the mouth portion 20A can be suppressed. Further, the locking ring protruding from the mouth tube portion 22 easily contracts during whitening crystallization, and the contraction may cause deformation of the top surface 21A. However, in this embodiment, the adverse effect of the locking ring can be eliminated. .
- the top surface sealability is improved.
- the top surface sealability depends on the smoothness and area of the top surface, but in the present embodiment, both characteristics are improved.
- the area of the top surface 21A is enlarged by the first top surface 22A of the mouth tube portion 22 and the second top surface 24A of the flange 24 that is flush with the first top surface 22A. Accordingly, when the lid 90 shown in FIG. 2 is attached, the seal area is increased by the enlarged top surface 21A, and the tight sealability with the seal portion 93 of the lid 90 can be enhanced. This is the first reason that the top surface sealability is improved.
- FIG. 5 shows a process of injecting resin into the cavity formed between the injection core mold 50 and the neck cavity mold 51 to injection mold the mouth portion 20A.
- the resin flows in from the bottom side of the preform for blow-molding the container 20A with a predetermined resin pressure along the arrow A direction.
- the resin pressure B along the resin flow direction A directly acts on the molding surface of the wide top surface 21A, whereas the resin pressure C acting on the molding surface of the narrow opposing surface 24B is in the resin flow direction A. Therefore, it can be seen that the pressure is smaller than the resin pressure B.
- the cooling efficiency is high, whereas the facing surface 24B is narrow and is cooled by contacting with the convex portion of the neck cavity mold 51. Cooling efficiency is low.
- the resin density on the second top surface 24A (top surface 21A) side is higher than the resin density on the facing surface 24B side.
- the resin density on the second top surface 24A (top surface 21A) side is still higher than the resin density on the facing surface 24B side.
- the resin density increases, the top surface 21A is less likely to shrink and deform, and the smoothness of the top surface 21A increases.
- the density is small when it is amorphous before crystallization, the shrinkage is large during heat treatment.
- the contraction deformation is allowed on the facing surface 24B side, the contraction deformation is suppressed on the second top surface 24A (top surface 21A) side. This is the second reason that the top surface sealability is improved.
- Still another application of the flange 24 is an application as a position shift prevention member in the axial direction with respect to the chuck members 60A and 60B as shown in FIGS.
- the wide-mouthed container 10A or a preform thereof supports the lower surface of the support ring 25 in the upright state with the mouth portion 20A facing upward and does not use the neck cavity mold. Otherwise, the chuck shown in FIG.
- the member 60A or the chuck member 60B shown in FIG. 4 is used.
- the chuck member 60 holds the engaged portion (thread) 23 from both sides, and in order to prevent the container 10A from shifting in the axial direction, the engaged portion (thread) 23, the flange 24, It can have the convex part 61 which goes in between.
- the support ring 25 can be eliminated.
- the chuck member 60B shown in FIG. 4 has a protrusion 62 that can contact the flange 24 and a protrusion 63 that can contact the support ring 25 in order to prevent the container 10A from shifting in the axial direction. Can do.
- FIG. 6 is a front view of a wide-mouth container according to a second embodiment of the present invention
- FIG. 7 is a sectional view of the mouth.
- a wide mouth container 10B made of synthetic resin has a mouth portion 20B, a trunk portion 30 and a bottom portion 40, and a top surface 21B of the mouth portion 20B is formed by a lid 90 (see FIG. 2) attached to the mouth portion 20B. Sealed.
- the mouth portion 20B includes the mouth tube portion 22, the engaged portion (thread) 23, and the support ring 25 as in the first embodiment, but does not have the flange 24. However, the flange 24 may be provided also in the second embodiment.
- the mouth portion 20 ⁇ / b> B has a ring-shaped recess 26 formed in the mouth tube portion 22 on the body portion 30 side of the engaged portion 23.
- the support ring 25 is not an essential configuration, and is the same as in the first embodiment.
- the mouth portion 20B of the wide-mouthed container 10B also has a ring-shaped recess 26 that does not require a locking ring that is necessary for the narrow-mouthed container and that can have a vertical width smaller than the height of the locking ring. Therefore, the overall height of the mouth portion 20B from the top surface 21B to the lower surface of the support ring 25 can be reduced, and the amount of preform resin for blow molding the container 10B can be reduced accordingly. If the volume of the mouth portion 20B decreases, the volume shrinkage during whitening crystallization also decreases, so that deformation of the top surface 21B of the mouth portion 20B can be suppressed.
- the locking ring protruding from the mouth tube portion 22 is likely to shrink during whitening crystallization, and the shrinkage may cause deformation of the top surface 21B. Since the ring-shaped concave portion 26 is included, the influence of volume shrinkage is small.
- Still another application of the ring-shaped recess 26 is an application as an engaged portion of the chuck member 70 as shown in FIG.
- the wide-mouthed container 10B or its preform supports the lower surface of the support ring 25 in the upright state with the mouth portion 20B facing upward and does not use the neck cavity mold, but the chuck member 70 is used otherwise. It is done.
- the chuck member 70 holds the engaged portion (thread) 23 from both sides, but a protrusion 71 that enters the ring-shaped recess 26 may be provided to prevent the container 10B from shifting in the axial direction. it can.
- the support ring 25 can be dispensed with if it is conveyed upside down without being upright.
- FIG. 8 is an end view of the engaged portions (threads) 23 of the containers 10A and 10B shown in FIGS. 1 and 6 as viewed from the top surfaces 21A and 21B. It is. However, for the example of FIG. 1, the flange 24 is omitted in FIG.
- the engaged portion 23 is N (N is an integer of 2 or more, preferably 4 ⁇ N ⁇ 6.
- N 4 screw threads 23A to 23D (three are shown in FIGS. 1 and 6).
- the formation range ⁇ 2 is formed in a range less than 360 ° / N.
- the cap 90 shown in FIG. 2 When the cap 90 shown in FIG. 2 is attached to the mouth portion 20A (20B) having the multiple threads 23A to 23D, the four engaging portions (lugs) 92 of the cap 90 are connected to the multiple threads.
- the cap 23A to 23D is capped in a bottle (4 to 6), and the wide-mouthed container 10A (10B) can be opened and closed by, for example, rotating the cap 90 1/4 to 1/6.
- the formation range of each of the four threads 23A to 23D is less than 90 ° ( ⁇ 2 ⁇ 90 °). That is, a gap is always formed between adjacent four threads 23A to 23D that are discontinuous in the circumferential direction.
- the volume of the engaged portion (thread) 23 can be further reduced, and the top surface 21A (21B) can be prevented from being deformed.
- the convex portion 71 of the chuck member 70 fits into the ring-shaped concave portion 26 of the mouth portion 20 ⁇ / b> B so that the mouth portion 20 ⁇ / b> B sandwiched between the chuck members 70 does not fall.
- the depth of the ring-shaped concave portion 26 has an upper limit in relation to the thickness of the mouth tube portion 22. If the depth of the ring-shaped concave portion 26 is increased beyond the upper limit, the flow of the resin that forms the mouth tube portion 22 at the time of preform injection molding is hindered in the region of the ring-shaped concave portion 26, resulting in defects such as short shots. This is because. In terms of reducing the amount of resin, there is also an upper limit to the thickness of the mouth tube portion 22. For example, when the thickness of the mouth tube portion 22 is 1.5 mm, the depth of the ring-shaped recess 26 is 0.5 mm. . Since there is an upper limit to the depth of the ring-shaped recess 26 as described above, there is a possibility that the chuck member 70 shown in FIG.
- the second height position H2 that extends incline toward the surface 21A (21B) side is provided as the end 23-2. That is, each of the four screw threads 23A to 23D protrudes to the first height position H1 at a position separated in the circumferential direction of the mouth tube portion 22, and directly above the ring-shaped recess 26. It has a start end 23-1.
- the convex portions 71 of the chuck member 70 are at four locations in the circumferential direction of the mouth tube portion 22 at the first height position H1. It is possible to prevent the mouth portion 20B from being dropped from the chuck member 70 by being caught by the four start ends 23-1 projecting at. In this way, the plurality of starting ends 23-1 can function as stoppers.
- FIGS. 9A to 9D are diagrams showing the main steps of the mouth crystallization method
- FIG. 10 is a characteristic diagram showing the transition of the mouth surface temperature and core temperature in one cycle. It is.
- a preform 100 for a wide-mouth container is injection-molded in advance and carried into a mouth crystallization apparatus.
- the mouth crystallization apparatus can target not only the preform before blow molding but also the mouth of the container after blow molding. However, transport of a container larger than the preform leads to enlargement of the apparatus. .
- the preform 100 has a mouth part 101, a body part 102, and a bottom part 103. Since the mouth portion 101 is not blow-molded, the mouth portion 101 of the preform 100 may have either one of the mouth portion 20A shown in FIG. 1 or the mouth portion 20B shown in FIG. It may be.
- FIG. 9A shows a process of inserting the core 110 into the mouth portion 101 of the preform 100.
- the preform 100 is inverted and conveyed on the cylinder 120.
- the core 110 is fixed in the middle of the lifting rod 130, and a pad 132 is fixed to the upper end of the lifting rod 130.
- the lifting rod 130 is raised, the core 110 is disposed in the mouth portion 101 of the preform 100, and the preform 100 is slightly pushed up by the pad 132 so that it does not contact the cylinder 120.
- the core 110 is formed by disposing an outer layer body 114 made of a material having infrared absorption, infrared reflection, or both functions on the peripheral surface of the heat insulator 112.
- the outer layer body 114 is, for example, a metal, and is formed of aluminum (Al) in the present embodiment.
- the core 110 itself does not wait for a heating source, but heats the mouth 101 from the inside by reflecting infrared rays from a heater, for example, an infrared heater 140 described later, or by the heat retained by the core 110. .
- the inner heating from the core 110 and the outer heating from the infrared heater 140 in combination, the temperature difference between the inside and outside of the mouth portion 101 can be reduced and the crystallization time can be shortened.
- the apparatus is not complicated.
- the core 110 may have a heat shield plate 116 that shields heat by reflection or the like on the upper surface.
- the heat shield plate 116 can prevent heat from being transmitted to the body 102 side.
- FIG. 9B shows a heating process.
- the mouth portion 101 is heated by the infrared heater 140 while rotating the preform 100 in which the core 110 is inserted into the mouth portion 101 and transporting it along the transport direction.
- a plurality of infrared heaters 140 are provided along the preform conveying directions A1 and A2 shown in FIG.
- the infrared heater 140 is disposed to face the conveyance path, for example, and uniformly heats the mouth portion 101 of the preform 100 that is rotated.
- the body portion 102 of the preform 100 can be surrounded by a heat-insulating cylinder 150 and heat can be shielded from the infrared heater 130.
- FIG. 9C shows a process of cooling the mouth portion 101 of the preform 100 with the core 110 inserted.
- the cooling process may be natural air cooling in which the preform 100 is rotated, or may be forced cooling using a refrigerant. Shrinkage deformation of the mouth part 101 in the cooling process is regulated by the core 110.
- FIG. 9D shows a process of removing the core 110 from the mouth portion 101 of the preform 100. Thereafter, the preform 100 that has been crystallized at the mouth is taken out from the cylinder 120, whereby one cycle of the method for crystallizing the mouth is completed.
- FIG. 11 is a plan view schematically showing the conveyance path of the preform 100 and the infrared heater group 200.
- the preform is charged at the position P1, continuously or intermittently transported along the transport directions A1 and A2, heated, further cooled in the cooling zone 220, and crystallized at the position P2. Is carried out.
- the heating step includes a first step of driving the first infrared heater group 200-1 located upstream in the transport direction in the infrared heater group 200 shown in FIG. 11 with the first power.
- the first power for driving the first infrared heater group 200-1 is set to 70% of the full power, for example.
- Surface temperature T S of the mouth portion 101 of the preform 100 shown in FIG. 10 the temperature rise characteristics per unit time is heating becomes relatively steep.
- the second heater group 200-2 located downstream of the first infrared heater group 200-1 in the infrared heater group 200 shown in FIG.
- the second power for driving the second infrared heater groups 200-2 to 200-4 is set to 60% of the full power, for example.
- Surface temperature T S of the mouth portion 101 of the preform 100 shown in FIG. 10 the temperature rise characteristics per unit time is heating becomes gradually inclined than the first step.
- the reason for combining the first step of rapid heating and the second step of slow heating is to shorten the crystallization time and prevent the mouth portion 101 from being overheated.
- overheating occurs in the latter half of the heating step even if the crystallization time can be shortened.
- the crystallization time is extended even if the crystallization temperature can be controlled.
- the crystallization time can be shortened by rapid heating to a temperature that does not reach the crystallization temperature zone in the first step.
- FIG. 11 shows a non-heating zone 210 in which no heater group is provided between the first heater group 200-1 and the second heater group 200-2 or in which a heater group whose driving is stopped is arranged. Is provided.
- the surface temperature T S of the mouth portion 101 of the preform 100 as shown in FIG. 10 once tends to drop. Therefore, at the start of the second step, the influence of rapid heating in the first step can be suppressed.
- the temperature rise characteristics of the surface temperature T S of the mouth portion 101 of the preform 100 is easily brought to gentle slope than the first step.
- the third heater groups 200-3 and 200-4 located on the downstream side of the second infrared heater group 200-2 in the infrared heater group 200 shown in FIG.
- the third power for driving the third infrared heater groups 200-3 and 200-4 is set to, for example, 50 to 55% of the full power.
- the heater power is further powered down to easily maintain the temperature of the mouth portion 101 in the crystallization temperature zone. Thus, overheating of the mouth part 101 can be suppressed.
- the third power of the third infrared heater groups 200-3 and 200-4 shown in FIG. 11 can be further powered down downstream from the upstream side in the transport direction.
- the power of the third infrared heater group 200-3, 200-4 is 55% of the full power in the upstream infrared heater group 200-3, and the downstream infrared heater group 200-4. 50% of full power.
- the temperature is lowered toward the downstream side, so that the temperature rise rate is maintained or the temperature rise rate is lowered as shown in FIG. The temperature can be maintained.
- the power-down division may be divided into three or more divisions instead of two divisions of the infrared heater groups 200-3 and 200-4.
- the time during which the plurality of preforms 100 passes through the infrared heater group 200-1 is T1
- the plurality of preforms 100 pass through each of the infrared heater groups 200-2 to 200-4.
- the difference in time T1 is a difference in the length of a heating zone.
- the heating zones of the infrared heater groups 200-1 to 200-4 are made constant, but the heating time in each heating zone can be changed by making the heating zones different in length. Even when the preform is intermittently conveyed, the heating time in each heating zone can be changed by varying the length of each overheating zone.
- the time T2 can be 2 steps.
- an infrared heater having an excessively high temperature rise speed is not used to raise the temperature from room temperature to a temperature exceeding 100 ° C., for example.
- the time T1 of the first step is shorter than the time T2
- the rapid heating in the first step adversely affects the second step, making it difficult to control the crystallization temperature range, or the crystallization temperature. The time to reach the band becomes longer.
- FIG. 11 shows the temperature T C of the core 110.
- FIG. 11 shows an example in which the core 110 is preheated between the positions P1 and P2 shown in FIG. 11 before the core 110 is inserted into the mouth portion 101, for example.
- this mouth crystallization method may further include a step of preheating the core 110 before inserting the core 110 into the mouth 101.
- the core 110 is irradiated with infrared rays from the infrared heater 140 through the mouth portion 101, but the temperature is lowered due to contact with the mouth portion 101 at room temperature.
- the temperature of the core 110 and the surface temperature of the mouth portion 101 are made substantially equal. That is, the first step or the subsequent non-heating step is continued until the inside and outside temperatures of the mouth portion 101 become substantially equal.
- the preheating process of the core 110 is not necessarily required, the preheating can also contribute to shortening the first process time.
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Abstract
Description
口部、胴部及び底部を有するプリフォームの前記口部を結晶化する方法であって、
前記口部内にコアを挿入する工程と、
前記コアが前記口部に挿入された前記プリフォームを、自転させると共に搬送方向に沿って搬送しながら、前記搬送方向に沿って配置されたヒーター群により、前記口部を加熱する工程と、
前記プリフォームの前記口部を、前記コアを挿入した状態で冷却する工程と、
を有し、
前記加熱工程は、
前記ヒーター群のうち、前記搬送方向の上流側に位置する第1のヒーター群を第1のパワーで駆動する第1工程と、
前記ヒーター群のうち、前記第1のヒーター群よりも下流側に位置する第2のヒーター群を、前記口部が結晶化温度帯域に達するまで、前記第1のパワーよりも小さい第2のパワーで駆動する第2工程と、
を含むことを特徴とする。
前記口部は、
口筒部と、
前記口筒部より外方に突出形成され、前記蓋体が係合される被係合部と、
前記天面側にて前記口筒部より外方に突出形成され、前記口筒部からの突出高さが前記被係合部よりも低いフランジと、
を含み、
前記口部の天面は、前記口筒部の第1天面と、前記第1天面と面一である前記フランジの第2天面とで面積が拡大形成され、
前記フランジの厚さは、前記口筒部の厚さよりも薄く、
前記口部は結晶化されていることを特徴とする。
前記口部は、
口筒部と、
前記口筒部より外方に突出形成され、前記蓋体が係合される被係合部と、
前記被係合部よりも前記胴部側にて、前記口筒部に形成されたリング状凹部と、
を含むことを特徴とする。
図1は、本発明の第1実施形態に係る広口容器の正面図であり、図2は図1の広口容器の口部に装着される蓋体の断面図であり、図3及び図4は口部とそれを支持するチャックの断面図である。図1において、合成樹脂(例えばポリエチレンテレフタレート)製の広口容器10Aは、口部20A、胴部30及び底部40を有し、口部20Aに取り付けられる蓋体90(図2参照)によって口部20Aの天面21Aがシールされる。
図6は本発明の第2実施形態に係る広口容器の正面図であり、図7は口部の断面図である。図6において、合成樹脂製の広口容器10Bは、口部20B、胴部30及び底部40を有し、口部20Bに取り付けられる蓋体90(図2参照)によって口部20Bの天面21Bがシールされる。口部20Bは、第1実施形態と同様に口筒部22、被係合部(ねじ山)23及びサポートリング25を有するが、フランジ24を有していない。ただし、第2実施形態でもフランジ24を設けても良い。口部20Bは、被係合部23よりも胴部30側にて、口筒部22に形成されたリング状凹部26を有する。なお、サポートリング25が必須の構成ではない点は、第1実施形態と同じである。
図8は、図1及び図6に示す容器10A,10Bの被係合部(ねじ山)23を示す、天面21A,21B側から見た端面図である。ただし、図1の例に対しては、図8ではフランジ24を省略している。
次に、上述した第1,第2実施形態に係る広口容器10A(10B)や、他の広口容器及び細口容器にも適用できる口部の結晶化方法について説明する。図9(A)~図9(D)は口部の結晶化方法の主要工程を示す図であり、図10は口部の表面温度とコアの温度の一サイクル中での推移を示す特性図である。
胴部、40 底部、50 射出コア型、51 ネックキャビティ型、60A,60B,70 チャック部材、61,71 凸部、90 蓋体、100 プリフォーム、101 口部、102 胴部、103 底部、110 コア、112 絶縁体、114 外層体、116 遮熱板、120 筒体、130 昇降ロッド、132 パッド、140 赤外線ヒーター(ヒーター)、200 ヒーター群、200-1 第1のヒーター群、200-2~200-4 第2のヒーター群、210 非加熱ゾーン、220 冷却ゾーン
Claims (10)
- 口部、胴部及び底部を有するプリフォームの前記口部を結晶化する方法であって、
前記口部内にコアを挿入する工程と、
前記コアが前記口部に挿入された前記プリフォームを、自転させると共に搬送方向に沿って搬送しながら、前記搬送方向に沿って配置されたヒーター群により、前記口部を加熱する工程と、
前記プリフォームの前記口部を、前記コアを挿入した状態で冷却する工程と、
を有し、
前記加熱工程は、
前記ヒーター群のうち、前記搬送方向の上流側に位置する第1のヒーター群を第1のパワーで駆動する第1工程と、
前記ヒーター群のうち、前記第1のヒーター群よりも下流側に位置する第2のヒーター群を、前記口部が結晶化温度帯域に達するまで、前記第1のパワーよりも小さい第2のパワーで駆動する第2工程と、
を含むことを特徴とするプリフォームの口部結晶化方法。 - 請求項1において、
前記第1工程と前記第2工程との間に、前記プリフォームを非加熱で搬送する工程を含むことを特徴とするプリフォームの口部結晶化方法。 - 請求項1または2において、
前記ヒーター群のうち、前記第2のヒーター群よりも下流側に位置する第3のヒーター群を、前記第2のパワーよりも小さい第3のパワーで駆動して、前記口部の温度を前記結晶化温度帯域に維持する第3工程をさらに有することを特徴とするプリフォームの口部結晶化方法。 - 請求項3において、
前記第3工程では、前記第3のヒーター群の第3パワーを、前記搬送方向の上流側よりも下流側にてさらにパワーダウンすることを特徴とするプリフォームの口部結晶化方法。 - 請求項1乃至4のいずれかにおいて、
前記口部に前記コアを挿入する前に、前記コアを予備加熱する工程をさらに有することを特徴とするプリフォームの口部結晶化方法。 - 請求項1乃至5のいずれかにおいて、
前記プリフォームは、前記口部に取り付けられる蓋体によって前記口部の天面がシールされる広口容器を成形するためのプリフォームであり、
前記口部は、
口筒部と、
前記口筒部より外方に突出形成され、前記蓋体が係合される被係合部と、
前記天面側にて前記口筒部より外方に突出形成され、前記口筒部からの突出高さが前記被係合部よりも低いフランジと、
を含み、
前記口部の天面は、前記口筒部の第1天面と、前記第1天面と面一である前記フランジの第2天面とで面積が拡大形成され、
前記フランジの厚さは、前記口筒部の厚さよりも薄いことを特徴とするプリフォームの口部結晶化方法。 - 請求項6において、
前記フランジは、前記第2天面と対向する対向面を有し、前記第2天面側での樹脂密度が前記対向面側での樹脂密度よりも高いことを特徴とするプリフォームの口部結晶化方法。 - 請求項1乃至5のいずれかにおいて、
前記プリフォームは、前記口部に取り付けられる蓋体によって前記口部の天面がシールされる広口容器を成形するためのプリフォームであり、
前記口部は、
口筒部と、
前記口筒部より外方に突出形成され、前記蓋体が係合される被係合部と、
前記被係合部よりも前記胴部側にて、前記口筒部に形成されたリング状凹部と、
を含むことを特徴とするプリフォームの口部結晶化方法。 - 請求項6乃至8のいずれかにおいて、
前記被係合部はN(Nは2以上の整数)個のねじ山を有し、前記N個のねじ山は、前記口筒部の周方向にてN分割された領域に各一列で配置され、前記N分割領域の各々にて360゜/N未満の範囲に形成されていることを特徴とするプリフォームの口部結晶化方法。 - 請求項9において、
前記N個のねじ山の各々は、前記口筒部の軸方向にて、第1の高さ位置の始端から前記口部の天面側に向けて傾斜して延びた先の第2の位置を終端として有することを特徴とするプリフォームの口部結晶化方法。
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EP11786578.2A EP2578380B1 (en) | 2010-05-28 | 2011-05-23 | Preform opening crystallization method |
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US14/963,807 US20160096309A1 (en) | 2010-05-28 | 2015-12-09 | Preform neck crystallization method |
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JP2016064603A (ja) * | 2014-09-25 | 2016-04-28 | 日精エー・エス・ビー機械株式会社 | ブロー成形装置、ブロー成形方法及びプリフォームのシール/位置決め部品 |
US10857721B2 (en) | 2014-09-25 | 2020-12-08 | Nissei Asb Machine Co., Ltd. | Blow molding device, blow molding method, and preform sealing/positioning part |
US10647464B2 (en) | 2014-11-07 | 2020-05-12 | S.I.P.A. Societa' Industrializzazione Progettazione E Automazione S.P.A. | Thermoplastic preform for a wide-mouth container |
Also Published As
Publication number | Publication date |
---|---|
US20160096309A1 (en) | 2016-04-07 |
EP2578380A1 (en) | 2013-04-10 |
US20190030781A1 (en) | 2019-01-31 |
EP2578380B1 (en) | 2020-05-06 |
JPWO2011148879A1 (ja) | 2013-07-25 |
EP2578380A4 (en) | 2017-03-01 |
CN102905872A (zh) | 2013-01-30 |
US20130087943A1 (en) | 2013-04-11 |
JP6133342B2 (ja) | 2017-05-24 |
US10899064B2 (en) | 2021-01-26 |
JP2015131685A (ja) | 2015-07-23 |
JP5706407B2 (ja) | 2015-04-22 |
CN102905872B (zh) | 2015-08-12 |
US9238341B2 (en) | 2016-01-19 |
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