CN86104270A - The blow molding method of plastics - Google Patents

The blow molding method of plastics Download PDF

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Publication number
CN86104270A
CN86104270A CN198686104270A CN86104270A CN86104270A CN 86104270 A CN86104270 A CN 86104270A CN 198686104270 A CN198686104270 A CN 198686104270A CN 86104270 A CN86104270 A CN 86104270A CN 86104270 A CN86104270 A CN 86104270A
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China
Prior art keywords
wall thickness
parison
length
axle
predetermined
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Pending
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CN198686104270A
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Chinese (zh)
Inventor
野村昭博
深濑久彦
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IHI Corp
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IHI Corp
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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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/7686—Measuring, controlling or regulating the ejected articles, e.g. weight control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
    • B29C48/2528—Drive or actuation means for non-plasticising purposes, e.g. dosing unit
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/0411—Means for defining the wall or layer thickness
    • B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C2049/787—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C2049/788—Controller type or interface
    • B29C2049/78805—Computer or PLC control
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92076—Position, e.g. linear or angular
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92142—Length
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92438—Conveying, transporting or storage of 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92466—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92571—Position, e.g. linear or angular
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92961—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/42412—Marking or printing
    • B29C49/42413—Marking or printing with a pattern for analysing deformation
    • 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
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0022—Bright, glossy or shiny surface
    • 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
    • B29L2022/00—Hollow articles

Abstract

The invention describes a kind of plastic injecting and blowing forming method, in the method, constant wall thickness partly is the control that moves both vertically by axle, and the wall thickness thickening is controlled by block movably.The alternate profile of the circumferential thickness of being determined by axle and movable block is detected, and along with the alternate profile of this thickness that so obtains, and has controlled the position of axle and movable block automatically, make must injection moulding parison have predetermined thickness distribution.In addition,, regulate all positions of axle and movable block, make parison automatically have its predetermined length along with the detection of parison length.

Description

The blow molding method of plastics
The present invention relates to a kind of blow molding method of plastics, more precisely, relate to a kind of method of controlling system of parison wall thickness.
Fig. 1 has provided a kind of habitual injection blow moulding machinery.Be used for the garden tubular plastic body that injecting preform 1(is extruded by a nozzle) biconial head 2 be coupled to the mould (not shown).The axle 4 that can move both vertically under servo cylinder 3 effect is contained in this head 2, in order to limiting nozzle bore seam 5, and the gap between the lower end that the moving both vertically of axle 4 can be regulated axle 4 and the interior lower end of this head 2.A hollow injection piston 7 is used for material 6 is pressed into determined space between this head 2 and this axle 4, and under the effect of injection cylinder 8, the injection ram 7 of hollow can move both vertically.Be fit to the sensor 9 of the injection stroke of detection injection ram 7, be coupled to adjusting device 10, this adjusting device 10 comprises an adjustment means, for example: habitual control panel or slide switch, in order to regulate the width of nozzle bore seam 5.The servo valve 11 that is coupled to servo cylinder 3 also is coupled to this adjusting device 10, and scriber 13 also is coupled to this adjusting device 10.Scriber 13 is used on parison 1 longitudinally making mark 12(just along the direction of extruding of parison 1 with predetermined spacing).Pachometer 14 is used for measuring at each gauge point 12 places the wall thickness of mold parisons 15.Pachometer 14 for example can use ultrasonic thickness gauge, and it also is coupled to adjusting device 10.
The plastic injecting and blowing forming machine of described type, the adjusting of its system of parison wall thickness is as described below.At first, can control separately with parison extrude and an amount changing, for example, the injection stroke of injection ram 7, and consider the increase or the change of the wall thickness of parison 1, when injection ram 7 whenever is in a reposition by a predetermined spacing, can predetermined nozzle hole seam width S 1The nozzle bore seam width S of secondly, being scheduled in shot piston 7 predetermined each positions 1Be imported in the adjusting device 10, adjusting device 10 is used to regulate nozzle bore seam width, and shot sleeve 8 begins to push injection moulding subsequently.Sensor 9 will represent that the signal of shot piston 7 positions flows to adjusting device 10 continuously; In each precalculated position of shot piston 7, servo cylinder 3 drive spindles 4 are in vertical motion, and adjust nozzle bore seam width S 1Simultaneously, adjusting device 10 outputs signal to scriber 13, is used for making a mark 12 corresponding to each predetermined position of shot piston 7 on parison.Because mark 12 is to make with the injection stroke of shot piston 7, so mark 12 vertically is separated at parison 1.
Finish when the extruding injection moulding one of parison 1, parison 1 just shifts out from mould, and measures the wall thickness of parison at each mark 12 places with pachometer 14.Operating personnel compare predetermined thickness and actual measurement thickness, and regulate this adjusting device 10.When predetermined thickness is thinner than actual measurement thickness, increase nozzle bore seam width S 1; When predetermined thickness is thicker than actual measurement thickness, reduce nozzle bore seam width S 1After this, carry out injection operation once more, and compare at the wall thickness of each mark measurement parison 1 and with predetermined thickness by preceding method.Actual measurement wall thickness and predetermined wall thickness have really matched, and then explanation has regulated nozzle bore seam width S 1Begin continuous production subsequently.
But above-mentioned plastic injecting and blowing forming method has following point:
(ⅰ) at first, nozzle bore seam width S 1Be uniformly on the Zhou Fangxiang of garden, like this, if want to increase the circumferential local thickness of parison 1, for example, provide an opening or reinforcing section, it is impossible wanting in the circumferentially predetermined alternate profile of thickness.
(ⅱ) only rely on the feedback of moulded parts actual measurement wall thickness, can not guarantee the length of parison, and improved part can not guarantee to be positioned at the same position of mould.
(ⅲ) nozzle bore seam width is regulated by operating personnel, and such operation is very complicated and be not very effective.
The objective of the invention is in order to overcome the problem that run in the habitual plastic injecting and blowing forming method (above-mentioned with other), a kind of new plastic injecting and blowing forming method is provided, uses this method to control the alternate profile of the circumferential thickness of parison and its length simultaneously and automatically.
Injection moulding process of the present invention is finished like this, promptly, constant wall thickness partly is the control that moves both vertically by axle, and thicken wall part by movably block control, it comprises following some steps, longitudinally makes a mark on the constant wall thickness of parison part and along thickening on the wall part of circumferentially separating with predetermined distance; Wall thickness at each mark part measurement mode product, to survey wall thickness then compares with the predetermined wall thickness that control device uses in advance, acquisition is by described axle and the determined nozzle bore seam of described movable block width, in the next step of a moulded parts of injection moulding, to move this axle and block movably, make the difference between actual measurement wall thickness and the predetermined wall thickness become minimum, obtained this nozzle bore seam width according to described nozzle bore seam width adjusting; The signal of the length of measuring the length of parison and will representing to be detected is delivered to this control device, so that it is compared with the predetermined length that this control device uses in advance, and regulate movably block of described axle and all, make the measured length of this parison and the difference between its predetermined length be transferred to minimum.
In said method, can use the control device that constant wall thickness part and the thickness that thickens wall part is shown as the function of parison length.
Described a most preferred embodiment of the present invention below in conjunction with accompanying drawing, can more be expressly understood above-mentioned and other purposes of the present invention, effect, feature and advantage by it.
Fig. 1 has provided habitual plastic injecting and blowing make-up machine, and
Fig. 2 has provided the injection blow moulding machine that is suitable for implementing plastic injecting and blowing forming method of the present invention.In two figure, the same reference numeral same parts.
The notes that Fig. 2 has represented to be suitable for to implement plastic injecting and blowing forming method of the present invention blow forming machine.As shown in Figure 2, it circumferentially is equipped with several separated movably blocks 17 at the lower end edge of head 2.These blocks 17 can be respectively move on radial direction under the effect of operating mechanism 16, so that really shaped block 1 thickens wall g 1And g 2Scriber 13 is used for vertically making a mark 12 with preset distance along parison 1 on parison 1, and scriber is installed in the bottom of each movable block 17.Other scriber 13(is not shown) be used for marking at parison 1 constant wall thickness part G place.The control signal that comes from control device 24 is used for control operation mechanism 16, scriber 13 and makes the driving of the servo cylinder 3 that axle 4 moves both vertically.
A length detection device 18 is installed, and for example, photoelectric tube is used for detecting the length of parison 1.
The length signals 19 that comes from detector 18, the wall thickness signal that comes from the injection ram position signalling 20 of sensor 9 and come from meter 14 all flows to control device 24, makes the constant portion G and the thickening g of wall 1And g 2Demonstration be the function of parison 1 length.
The signal 23 of the thickness of the constant wall thickness part that expression is predetermined and the predetermined predetermined wall thickness signal that thickens wall part thickness 22 and expression parison 1 predetermined length all flows to control device 24.
Therefore, according to the ratio between each underlined part predetermined thickness 22 and the test injecting preform 15 actual measurement thickness 21, control device 24 stitches width in each underlined part along circumferentially obtaining new hole, thereby, vertically obtained the alternate profile of circumferential thickness at parison with predetermined distance.According to the alternate profile of such thickness that obtains, driven the servo valve 11 and the operating mechanism 16 of servo cylinder 3, make constant wall thickness part G and thicken wall part g 1And g 2Can automatically have predetermined wall thickness respectively.
In addition, detector 18 is used for detecting the length of parison 1, and length signals 19 is delivered to control device 24 from this detector 18, in order to control servo cylinder 3 and operating mechanism 16, make it its whole wall thickness of circumferential adjusting, so that parison 1 has predetermined length 23 at parison 1.
Be appreciated that the present invention is not limited in the foregoing description, under the situation that does not break away from spirit of the present invention, can also carry out various improvement.For example, itself just can limit nozzle bore seam and rubber-like part and can be used as this movably block 17, make that block 17 mobile is with part elastic deformation's form realization.In addition, can use various injection mouldings to thicken the method for wall, various methods that make marks and detect the method for parison length at this.
Effect of the present invention, feature and advantage are can summation as follows:
(ⅰ) thicken in the parison of wall at its persevering heavy wall pipe of injection moulding, detect the alternate profile of parison thickness, and so and circumferential wall thickness of energy automatic control type base. Thereby eliminated complicated adjusting operation, and improved control ability.
(ⅱ) can regulate the position of axle and movable block according to the detection of parison length. Therefore by the circumferential full depth of adjusting parison can the automatic control type base length.
(ⅲ) control of injecting products wall thickness accuracy is improved. In addition, the contrast between the distribution of moulded parts wall thickness and the predetermined hole seam width pattern is to be easy to very much, and can stitch the width pattern with distribution and the predetermined nozzle hole of a simple method improvement wall thickness. Therefore, strengthened control to quality.
(ⅳ) by the suitable design of mould to the casting moulded parts, therefore the wall thickness of measurement mode product each several part can realize computed online production automatically.

Claims (2)

1, a kind of plastic injecting and blowing forming method, in the method, control the constant wall thickness part with moving both vertically of axle, and the thickening of wall is by the control of block movably, and it comprises following some steps: with preset distance longitudinally on the constant wall thickness part of parison and along making a mark on the wall thickness thickening that circumferentially separates; At the wall thickness of each mark part measurement mode product, will survey wall thickness then and compare with the predetermined wall thickness of being defeated by control device in advance, obtain by described axle and movably the determined nozzle bore of block stitch width; In the next step of a moulded parts of injection moulding, will move this axle and block movably, make that the difference between actual measurement wall thickness and the predetermined wall thickness becomes minimum, obtained nozzle bore seam width according to said nozzle bore seam width adjusting; The signal of the length of measuring the length of parison and will representing to be detected is delivered to this control device, so that it is compared with the predetermined length of being defeated by this control device in advance, and regulate described axle and all positions of block movably, make the measured length of this parison and the difference between its predetermined length be transferred to minimum.
2, in accordance with the method for claim 1 a kind of, wherein, employed control device can be shown as constant wall thickness part and the thickness that thickens wall part the function of parison length.
CN198686104270A 1985-08-01 1986-06-25 The blow molding method of plastics Pending CN86104270A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP170165/85 1985-08-01
JP60170165A JPS6230020A (en) 1985-08-01 1985-08-01 Plastic blow molding process

Publications (1)

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CN86104270A true CN86104270A (en) 1987-01-28

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CN198686104270A Pending CN86104270A (en) 1985-08-01 1986-06-25 The blow molding method of plastics

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JP (1) JPS6230020A (en)
KR (1) KR910000498B1 (en)
CN (1) CN86104270A (en)
DE (1) DE3619113A1 (en)
GB (1) GB2178361B (en)
IT (1) IT1204887B (en)
SE (1) SE8602466L (en)

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CN101138885B (en) * 2007-10-17 2010-05-19 华南理工大学 Extrusion-blow molding product wall thickness intelligentized control system and control method thereof
CN110355992A (en) * 2019-08-27 2019-10-22 束宇晨 A kind of dedicated 3D printer spray head of expansion plastic pipe trial-production
CN110355992B (en) * 2019-08-27 2021-06-01 安徽省春谷3D打印智能装备产业技术研究院有限公司 Special 3D print head of inflation plastic tubing trial-manufacturing

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DE3619113C2 (en) 1990-10-25
GB2178361B (en) 1989-07-26
JPS6230020A (en) 1987-02-09
KR870001920A (en) 1987-03-28
GB8618580D0 (en) 1986-09-10
KR910000498B1 (en) 1991-01-26
IT8620626A0 (en) 1986-05-30
SE8602466L (en) 1987-02-02
DE3619113A1 (en) 1987-02-12
JPH035294B2 (en) 1991-01-25
GB2178361A (en) 1987-02-11
IT1204887B (en) 1989-03-10
SE8602466D0 (en) 1986-05-30

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