AU609533B2 - Method and apparatus for blow-molding containers - Google Patents

Description

C'O M4 M 0 N4 W E A L T If O' A S R IX OF A U S T R A L I A I t-, PATENTS ACT 1952 COMPLETE SPECIFICAT0ON 533 FOR OFFICE~ USE Class Xnt- Class App,11cationf Num~ber~; Lodqed; Complete Specification Lodged: Accepted: Published: Prior!. ty.; Related Art; p~ 1t1{W~ Name of, Applicanti Addressi of AplJcant; YQUIlNO K0OYflO Coll M ~J.

No. 2-6t Ojiman 3-Chomof 1 oto-Ku) Tokyo, XApa, UM ActualI. nventors); ~4 Address for Ser4icet DAVXES COtL tON, Patet~ Attoneys, 1, Lttlec Coln Strc@3t, MeUbuopnep 3000.

Comlee spcfctinfr the iVentLQn ottlqdt 4 APtPAUTUO VOR BLW-MOrDIN CQN~tP T2he fol~lowing satemet Ist a full. descrptiLon of thia inve Ltro 4 in Lu1dinq the best mnethod of prozrminy it~ known to 14

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Lu~ ;i la- 4*? .4 a a 6t4 4* 4#4* 4 p o 5Plr 4 4I 4 40 4 4 4 040044O 4 0I 444 4, 44 4 4* 4 4* r "*4 This invention relates to blow molding methods, products and apparatus for use in blow molding.

According to one aspect of the present invention there is provided a primary preformed piece for use in the formation of a blow molded bottle shaped container of biaxially oriented thermoplastic synthetic resin the container having container body with a relatively wide port; the primary preformed piece comprising: a generally disc shaped body portion which is capable of being oriented to form the container body of the container including a bottom wall of the container body, the disc-shaped body portion Including a central section and a peripheral edge section of reduced thickness relative to the central section; a neck portion Including a generally cylindrical section and an outer edge section which when the primary preformed piece Is In an upright attitude projects from the cylindrical section in a generally oblique fashion with respect 15 o o the body portion outwardly and upwardly said cylindrical section being secured to the peripheral edge portion of the body portion In a junction region, there being further provided a stepped section disposed In the Junction region said edge section of said neck portion having a curved outer lower peripheral surface and a curved upper surface, 20 In another aspect of the present Invention there Is provided a method of molding a blow molded bottle shaped container of baxially oriented thermoplastic synthetic resin with a wide port using a primary preformed piece as described above, the method comprising the steps ofr forming the primary preformed piece; 25 heating said primary preformed piece in a manner so as to thermally crystallise said neck portion;and thereafter blow molding by blaxial orientation said body portion to form the bottle shaped container.

According to yet another aspect of the present Invention there Is provided a method of molding a blow molded bottle shaped container of blaxially oriented thermoplastic synthetec resin with a wide port using a 910124 Asao~IO423B/ I ;I ii -2primary preformed piece as described above the method comprising the steps of: axially orienting the primary preformed piece at an orienting rate whereby the container so formed has a height more than ten times the original depth thereof; and radially orienting in a relatively small degree the primary preformed piece to form the container.

According to yet another aspect of the present invention there is provided a method of radiation heating a primary preformed piece as described above, said method comprising the steps of: forming the primary preformed piece; radiation heating the body portion In a region of the boundary of between the central section and the peripheral edge section by relatively 4 rotating said primary preformed piece and the heater so that the rate of S 15 temperature Increase at the peripheral edge section having large heat sink degree is substantially equal to the rate of temperature increase at the central section having small heat sink degree.

According to yet another aspect of the present invention there is provided a method of molding a blow molded bottle shaped container of 20 blaxially oriented thermoplastic synthetic resin with a wide port using a primary preformed piece as described above, said method comprising the steps of: unlaially orienting an upper part of the body portion; blaxially orienting the remaining part of said body portion and the 25 peripheral edge section; and s, orienting the remaining part of the bottom in such a manner that the orientation i sequentially shifted from btaxial orientation to unlaxial orientation from the peripheral edge section to the central section, According to yet another aspect of the present invention there Is provided a molding machine for blow molding a blow molded bottle shaped container of biaxially oriented thermoplastle synthetie resin with a wide port by i| 1.re a t 1 t -3biaxially orienting the primary preformed piece as described above, the molding machine comprising: a holding jig having a holding groove for engaging and holding the neck portion of the primary preformed piece and an orienting pin, the orienting pin being longitudinally movable at the centre of the holding jig; a bottom mold disposed oppositely to said holding jig; and a side mold which is engaged with said holding jig and the bottom mold from sides of the jig and the bottom mold so as to clamp the jig and the bottom mold In an orienting direction to inhibit removal of the neck portion from the holding groove, Preferred embodiments of the invention will hereinafter be described with reference to the accompanying drawings in which- Fig. I is a longitudinal sectional view of a bottle-shaped container with a Sswide port; Fig, 2 is an enlarged longitudinal sectional view of part of a bottleshaped container according to the invention with a conventional container part *4 4 4 4*4 a t 4 4 4 94 46 3 b being shown by hatched line; Figs. 3 through 5 show a primary preformed piece of injection molded shape for forming the bottle-shaped container with a wide port; Fig. 3 is a view showing the conventional primary preformed piece; Fig, 4 is a view showing the primary preformed piece of the invention Fig, 5 is a partially enlarged sectional view of the preformed piece; Figs, 0 and 7 are views showing other examples of the primary preformed piece; Fig. 6 is a sectional view of the preformed piece; Fig, 7 is a sectional vieW shwing a mod after molding the preformed piece;, 4t e Fig, 8 is a sectional view showing still another 44 example of the preformed piece; Fig. 9 and 10 are sectional views for describng a method of molding a bottle-shaped cotaitiner with a wide port of the invention; 4 *4 Figs, 11 and 12 are sectional views: for describing still another example of a method of molding a 4441; bottle-shaped container with a wide port of the 2nIV04tion; 425 441 1 *4en~a- 1;b" 4s 4 4lO~ 1 2 3 4 7 8 to I 14 11 it 12 14 15 16 *j7 21 2 2 24 94 25 26 27 At C38 U1t 46 Figs, 13 through 18 are explanatory views of a method of heating the primary preformed piece; Fig. 13 is a graph showing the temperature distribution of the primary preformed piece; Fig. 14 is a sectional view of the preformed piece; Fig. 15 is a sectional view of an embodiment of a heating method of the invention; Fig. 16 is a plan view of a heat shielding plate; Fig. 17 is a plan view showing the temperature distribution state of the primary preformed piece; Fig, 18 is an explanatory view of other heating method of the invention; Figs, 19 through 21 show molding machines for molding a bottle-shaped container from the primary preformed pidece Fig, 19 is a sectional view of the molding machine$ Fig, 20 is ap enlarged. sectional view of the essential part of the molding machine; and Fig, 21 is an enlarged sectional view of, the essential part of the molding machine after closaing the molds, DESCRIPTION OF THE PREFfERRED MBODIMENTS Embodiments of the present invention will be desrlibed i.n detail with r efeence to the acaompanying drawings.

A neck portion of a bottle-shoped container 1, with a wide port which is blow-molded of biaxiAljy oriented thermoplastic synthetic resin of the present invention has a cylindrical neck portion 4 of thick ashort cylindrioal zhpae betwoen ,a neck Odge portion 3 formed 1 in a curved surface having a radius (R J of curvature 2 improved in openability of a cap on the outer lower 3 peripheral surface 7 and formed in a curved surface 4 having a radius of curvature improved in sealability to the packing 11 of a cap 10 on the upper surface and 6 a container body 2 formed in cylindrical shape and thinly 7 in thickness with a bottom by biaxal orientation 8 blow-molding, and formed in a-structure that the neck 9 edge portion 3 is formed at the cylindrical neck portion 1 4 in the obliquely outwardly upwardly projected state II and the body 2 is integrated in the abruptly bent and 12 swelled state from the lower center to the outward 1$ direction of the cylindrical neck portion 4, 14 More particularly, the molding size of the neck edge portion 3 is constructed in a structure capable of 1 effectively preventing from varying due to the biAxial 17 orientation blow-molding of the body 2 or thermally ,1 O* iligorflln V 18 filling or fil1ing under pressure of content liquid in S" 10 the body 2 by disposing 4a lower surface 7 ourved in a aFst 20 radius (R 2 of curvature set so that a curved peripheral Se1 odge 12 of the cap 10 made of metal such as, for 22 examiple, aluminum can be rigidly engaged, a nea k edge 2 portion 3 having a cuwved surface shape formed in a e Ot "24 Qurvature suIrface shape that the packing 11 adhered to the cap 10 to obtain strong sealability between the cap 6 10 and the bottle-shaped t container I can be more losely 8 contacted, and a cylindrical neck portion 4 having a S28 thicknemsa capable of providing rigidity of the degree 2 that a deforming stress effected at the time of biaxial 3o t oriantation blow-molding the body 2 and a dfo-ming 1 stress corresponding to a force from the exterior 2 effected at the time of thermally filling content liquid 3 or filling under pressure are not transmitted.

4 In the embodiment shown, the body 2 is drooped 1 while being bent outwardly from the portion 2ear the 6 Qoutside edge of the lower end of the cylindrical neck 7 portion 4, a recess 0 is formed at the peripheral groove 8 shape on the boundary portion of the outer peripheral 9 surface between the cylindrical neck portion 4 and the body 2, and the inner peripheral surface 5 of the upper It end of the body as the connecting portion to the 12 cylindrical neck portion 4 is ourved in 4 large radius 13 of curvature, 14 The structure of the connecting portion of the body a to the cylindrIcal neck portion 4, i 1 the 1 upper end of the body is very important, and becomes 7 7 as described when the upper end of the body 2 is formed 8 upon applying of sufficient orientation thereto, 19 More particularly, the body before the blaxial m 20 orientation blow-molding is disposed substantially from 21 the center on the lower surface of the cylindrical neek 2 portion 4 in drooping state, When only the body 2 is a 23oriented from this shape, the upper end of the body 2 24 is extremely strongly oriented nd deformed to the 2 ylindrical neck portion 4 which ia not oriented nor deformed, Thus, even the body 2 in the vicinity of the 3 cyl3indricl nock portion 4 can be sufficiently oriented, W8 hen the upper end of the body 2 is oriented and deformed, A strong deformhin force is acted on the cylindrical neok portion 4, but since the cylindricl.

7 r 1 neck portion 4 is molded in a structure capable of 2 sufficiently enduring against the external force as 3 described above, the force from the body 2 side at the 4 orientation molding time is blocked by the cylindrical neck portion 4, and is not transmitted to the neck edge 6 portion 3 at all, 7 Similarly, when content liquid is thermally filled, 8 deforming force is created at the body 2 by this 9 hoating, but this force is not transmitted to the neck edge portion 3 by the cylindrical neck portion 4, According to the present invention as described Sabove the neck portion of the bottle-shaped container with a wide port can block the transmission of all 14 h external forces to the neck edge portion from the body side of the bottle-shaped container, and the blocking t action of transmitting the external forces operates t7 irrespective of the ,time of molding the bottle-shaped 8 container, the time of filling Qntent after the molding 9 and the using time, Therefore, the mechanica strength 4 .of the neck edge portion to be associated with the cap 1 for opening and olosing the bottle-shaped container can 2 be sufficiently incroased and funnecesary externaj s, 2Sforces are blocked to reliably prevent the deformation of the neck edge portion, Consequently, the dimensional ccuracy tof the neck edge portion can be maintained in 196 extremely high state, and when the dimensional accuracy of the neck edge portion is maintained preferably, high ft 9ealability of the cap can be otained, and preferable openability of the cap can be exeucted, Fig, a4 and 5 show primary prformed piece.

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1 2 3 4 7 8 11 ?2 14 17 28 I I I, 8

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It 1111, s Iol 1111a II 'r 30 for molding the bottle-shaped container, A conventional blow-molding of biaxial orientation carries out blowing an injection molded primary preformed piece of bottomed cylindrical shape of thermoplastic synthetic resin while Axally and radially orienting the primary preformed piece, As shown in Vig, $t the orienta-tion magnification of the primary preformed piece 20 to the bottle-haped oontainer I0 is approx, twice at the ratio of the axiaal length L of the bottleo-shaped container 10 to the Axial length I of the primary preformed piece 20, and appr~o, 2 to times at the ratio of the diameter 1) of the bottle-shapqd container 1,0 to the diameter d of the primary preformed piece Iore particqlarly, the conventional, biaXJ4a orientation blow molding can sufficJient),y orient the primary prformed pitqc 20 in Axial and xradSia dirctions so a to enhftnqo the phy icaJ, pr rt±es and the strength of the moldod bottle-shped containqr Itowever, the nook portion 21 of the primary, prformed piece 20 Is 4 portion 'to be fixed to a mold, "nd is not entirely oriented, Therefore, even after the peformed piece ims blow-noldd into the bottloshaped continer 10, the neck portion 21 reain9 I nhe t irjMc ,ihape as in the ptetQrn d piece and becomes the same 3h-pa pe t the neck poQrton 21 o1 the hottla-ghl pdp caontiner The bottle -sh e contfinez 1,0 of ouch shnpo can perform suffiient functionz an a containr for containi, for Qnplo, liquid but is qvidont2 4 y naot i j S II 1: proper as a container for cotaining foodstuffs such as, 2 Jam, 3 n Fig, 4, reference numeral 22 designates a.

4 primary preformed, piece of the present invention, which X. a thin tray shape njeqtion molded from thermoplastic, 61 s'ynthotic resin such as polyethylene terephthal te resi, ard constructed intogrally at a short cylindrical 8 neck portion 24 At the peripheral edge of the body portion 25 of a disshap, 1( This body portion 23 is,, a portion which beoomes a 11- body including a bottom of the bottlewshaped container after blQw-mQlding, the peripheral, end 2 of the body 13 il portion 23 is gradually reduced in thivknss from the 14 center towari the peripheral edge, and in reascod In thickness at the central portion 26, 16As shown in Fig the cylindioscl neck% portion 4 17 ig construcred integrall in the state that 4, tic edge 18porion is projeted olquely above the thick shor~t Sylindriqal neck portion 27, and tho neck edge potio-4 :1 28 1i fu~he ormned in %a cur'ved surface having preftwab le openability of cikp on the ute r lower :h '4 peuvZ-tec sti 1; co 2 and in rt curved surface hawirng, S ?3 pr~feable tealability to the packing (not sthown) of i 24 ~citulkd cap on the tipper surface The pimary preformed piace 22 thiw Pontrtted as 4% (19sibed Above is associated in a heated prdtrined 17 mold, and ia bow o4ed by biaial orientltion, In ##Root 98 t~his ca* an oritnting pin is flrt contacOted with the 2 Qe er of tho body potion 23 of the primary prMitormq 311 I)Ive~o 221 tho body portion Is axiastZy orintod tintdl

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1 becoming the magnificAtiOn of more than ten times of the 2 epth width 1, of the primary prefQrmed piece 2Q,, and is 3 tereafter liraily oriented until bqcming substantially 4 the same diameter 0 as the diameter d of the cylindrical neoX portion 24 of the primary preformed piorn i 6 to form a bttomed cylinder and mlded 4 a bottle-shped 7 container A bottke-shapod qonqtiner with a wide port havino kthe diaeter 9f a, oylindrical neck portion 24 8 bstantall~ the same A that of the body of the to le -haped container J0 gan be proyided, by empnolyng 2 I t le wding means construcz'ted as described above, The 13 bgttle-shapet container 1Q htow-mo1,ded from the primary 14 preformed piece constructed as described above can obtain strong mechanical strength along axial ditrection by tlhe orientation moldig in high magnification gS 17 sial direction, Flrther, the body portion 23 for, m oldng the body including the bottom of thle bottle'shpped container 10 Is formed to be subtantially flat, Accordgingy, it is necessary that to considerably 1 ::dialy orient the body portion 23 of' the primar y Pr etrmed piece to mold it in a cylindrial shape, To 3 2this end$ tile radial orientlng amount of the preformed piece can be inoreazed, largor than the apparent amoutntt S It itt pri efwrabe to form the fiat %octignnl shape of tho 26 body porion mo its to incrz ee tho radial mochanicsil )8 'r:Tho cenral portion 20 ot the body portion 2a of tho primary preformed piece im offeoctd byDig L :30 or-orinotl force by the orienting pin pticularly itt 'I ~P ff i: T 1 the time of axally orienting the preformeO, piece as described above, This central. prtion 26 formed in 3, stiffLciently large tht, okness by considering this point, 4 tt the radia lri ent;ing magnification 1,5 approx 1, as cdescribed, above, the orientation of the upper, end, of the bottle-3shapeod container 10 to be molded might become 7 insufficiont, but the periphoera end 2 of the body S Portion 23 of the primary preformed piece I corrospondn i to the upper' enc of the blow-mqlced hottle-shpeod container 10 becomes thin, Thcreox'e, the body por~tion fX i scan be, readily orin ted, And considered 0 0 4 4 not to~9 1Z Pausta Athe bovo-desrblo dwbaokt 113 Fttr&thor it is consiered that the Q enririg, for'ce 14 ig±ht effect the influence tQ the cylindrical neck 1 I portion 04 At the time of orienting the bodyV' potoso I hut in the 9tructuzre of the prmary' preformed piece 2 the thiqlk short c; ndr'iog! nleck portion 27 is disposed g i At the lowgr position o the ank edge portion 28, the orietng fo :LrQo 18a not t.4nsmitted viAk the cyinOd4ica ~:4onck porttl 27 to thie nqok edge portion 28, and the o Q*nbi"t 4nd th e sea lbility QoC the ctiiked4 cap oann a2 bo a~cordinglY provided, 23 ore p~rticularly, aince the radial oretation io %4 m4liht, the diameter of the body of the bottle14~haPed conta~iner 1Q thus moldedi 10 s~bstatially the same as 116 th t of the cindical nook, portion 24 Acodingly, i bottle-haped co1tainer with ai wide port of desir~ed ,iiZ o caii be provided, Since the radJtat orintation iz sm l but the molded bottle-xhnped containe 1 i4 3affjointl y riant d iA~ jlly snd formed in a vye i ndricfd i4 t T 1 1 shape, the bottle-shaped container having sufficiently 2 large strength can be provided.

3 The primary preformed piee 22 used in case of 4 the above-described molding means is constructed to be S, integrally formed with the yinrical. neck portion 24 at the peripheral edge of the body portion 23 of the 7' disc shape and the body portion 23 to become a body V including the bottom of the bottle-shaped container 0 S is red~ued. in thiq1ness at the peripheral end 25 and incroa4ed in thic~ness at the central portion 2, ti AcMordingly, the strength of the central portion 2$ 12 which is e$,'cted, by large axial orienting force at the 0 orienta~t~oq-iloi time can be Proided, Further, the 14 rdial Qrentatiorl ia mal, and he oienitsat of4 the peripheral end 2 which i. hardly oriented can be effeatively xecuteds MOrover, even if the body 1 i po~ttin 23 is o± rient, the neck edge portion 28 18 8ttongly required for~ the dinenslQna Apquracy' at the cylindrif4l neck portion 24 hAs a thick ihort cylindrical neck portionI and is not accordingly deiored, thereby mldin an e*laellent bottle shpod 22container with a. wide port.

ig, 0 and 7 thow othei ewmpla Qf$ preormd piece -to be blW-molde 4nto a bttl-hpod container of 4 thq invention, Az shown in Fig Otriftry prefr e ce 2:a 7 hits a thin tray %hape integral formedt with a short oylindrical neck portionn 3 2t the peripheml odgO ot f body portion 31 ofit' d±*c zhupo, and i Qnttructed to 46 lot W ti~ ~Po -w porl D dphorhltxg itrip 4 by h slghtl proectingof.n fitf I width substantially at the center of the inner 2 peripheral surface of the cylindrical neck portion 32.

3 The cylindrical neck portion 32 is constructed 4 integrally with a neck edge portion 35 in th.e state Qblique'ly outwardly Upwardly projected at the thick short cyincritqal neck portion 34, and the neck; edge 7 portion 35 is further formed in a curved surface improved fPr the openablility of a oaulked cap (not shown) associated after molded as 4 bottle-shapod container at the Quter lower peripheral surface 30 and i in an 4 curve~ urvede iprovd sor the sealablityv to the 12 packing of the qaulked 0ap At the upper surface0 397.

3 In the embodiment described Above, the thick -short 14 cylindrial, neck portion 34 of the short. oyind'ical t 9 neck portion 032 is formed in a predetermined 16 Threfore, the orientiog foroo is not. affected to the 1~ ne-k edgo portion Oven when orienting the body 18 portion al, but the shape of the neck edge portion 9 (an be obtained, 'urthef, the peripheral strip 3 4J 20 formed on the inner peripheral surface of the 21 cylindrical nook ron 3, -Atqordingly, the r 8igiditY 22 of the cylIindrical nec% portion 32 1,8 further Icesd :creased, 3 nod the7 colindrical neck portion Q2 is not deformed nor strained at the time o4 orientation blow-molding or in case of fillting content After molding aa i A ttle-haped ~27::r lrir 7 $how a primary preformed piece 22 of the abovo, s4trctUrq, Inj~otioa molde and removed from tho 4 mld, Aftor the primary proformed piece 22 itt- injection 1 2 3 4 6 7 8 1 C 121 13 14 1 16 17 18 S4* 4 944 8 24 4 26 .17

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4'll: molded, a cavity 38 of the mold is axially moved to remove the preformed piece. The primary preformed piece 22 is engaged lightly at the peripheral strip 33 slightly projected inwardly with a core 39, and is not adhered at the cavity 38 side, and the preformed piece 22 is smoothly removed from the cavity 38 of the mold, After the preformed piece 22 is removed from the cavity 38 of the mold, the engagement of the core 39 ith the peripheral strip 33 is forcibly released by projecting an ejector pin in the core 39, thereby removing the primary preformed piece 22 from the core 39, Therefore, the projecting width of the peripheral strip 39 is set to the degree capable of engaging the primary preformed piece 22 with the core 39 side at the t time of releasing the piece 22 from the cavity 39 of the mold and simply releasing the piece 22 from the core 39 by the ejector pin t the mold releasing time.

As apparent from the above description, the primary preformed piece 22 of the invention is in the thin tray shape, and the peripheral strip $0 Is formed on the inner peripheral srface of the short cylindrical neck portion 02, Thoreforeg the bottle-shaped container with a wide port can be simply blow-molded by biaxial orientation, and thie 4trength of the shaort clindrical neck portion 02 can be obtained by the peripheral strip 33. Thus, the cylindrical neck portion $2 is not dieformed at the time of molding or filling a content, and even when the caulked cap is aspociated with the cylindrical neck portion 32 after molding As the bottlie-shaaped container,

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1 1 j the sealability and the openability of the cap can be 2 improved.

3 Further, when the primary preformed piece 22 itself I is injection molded, the peripheral strip 33 is lightly engaged partly with the core 39. Accordingly, the 6 preformed piece 22 is not adhered to the cavity 38 side 7 of the mold at the time of removing the preformed piece 8 22 from the cavity, but can be effectively and 9 accurately removed from the mold.

1Fig, 8 shows still another ecample of a primary 11 ii preformed piece for molding a bottle-sahped container 12 of the invention, 13 As shown in Fig, 8, a primary preformed piece 22 14 is formed in a thin tray shape integrated with a short cylindrical neck portion 41 at the peripheral edge of 4 6 body portion 40 of a disc shape to becQme a body t7 including a bottom 9f a blow-molded bottle-shaped icontainer, a ring-shaped recess groove 42 is formed at t )the periphery at the center of the body portion 40 as a center on a predetermined position on the inner surfaxe S11of the body portion 40, and a 'projecting strip 43 is S22 similarly formed on the outer surface of the body 23 fportion 24 On the contrary, it is noted that the recess Oroovo 26 42 may be formed on the outer surface of the body "26 portion 40 and the projecting strip 42 may be formed on "the inner surface ofC the body portion 40. Further, the *428 recess groove may not always be formed at the center of O thes body portion 40 as a center, but may be swelled or 0 3 submerged to form a pattern of a predetermined mark at I~ 1*i

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Ia part of the body portion 40. Thus, uneven surface is 2 formed on the body portion 40 by the formation of the 3 recess groove 42, the projecting strip 43 and the 4 pattern, and thick portions and thin portions are presented in this matter, 6 As a result that such a primary preformed piece 22 7 11 is blow-molded by a biaxial orientation, the entire body 8 I, portion 40 exccept the short cylindrical neck portion 41 9 is sufficiently oriented to mold a bottle-shaped oi~fltainer with a wide port along a blowing mold. When a predetermined Position of the primary preformed piece 22 corresponding to a predetermined position suchao 131 lower end of a bottle-shaped container 1 which tends to 14 reduce in thickness particularly upon orienting strongly is increased in thickness by Arranging, for exampla, a 16, projecting strip 43 having a width in this case, the 17 ~bottle-shApect conaipter 1 after bliow-molding is molded 1$ in A uniform thitcknos94 While being suftiinl S19- oriented, thereby obtaining mechanlical. strength, .When a mark~ pattern, is formed on the primary 9 preformed ptec 20 a thick portion (or 4 thin portion) Sto be formed at thin botttle-shapod contie 1 i 23 presented in a, pattern shape after the blow'-moldctng, And 24 the pattern can be Visually observed -from the exterior, floweVer, in order 'to obtAino such 44 exteroal AppeAranao effect, it is necessary to use A material which, has 27 excellgnt trAnspiarency stuah As polyoth/liono terephthAlato resin as the thermoplastic synthetic resin, 29The short cylindrical, neck Portion 41 is constructed integrally with A ncok edge portion 45 in S17 1 the state of oliquely upwardly projecting from a thick 2 short cylindrical neck portion 44, and the neck edge 3 portion 45 is further formed in a curved surface 4 improved for the openability of a caulked cap (not shown) associated after molded as a bottle-shaped 6 container 1 at the outer lower peripheral end surface 46 7 and A curved surface improved for the sealability to the 8 packing of the cap, 9 Therefore, when the primary preformed piece 22 is blow-molded by biaxai orientation as described above, Sthe body portion 40 is oriented, This orienting force t2 does not effect the influence to the neck edge portion 13 45 due to the presence of the thick short cylindrical 14 neck portion 44, the neck edge portion 45 is maintained 1 as the original shape, thereby sufficiently obtaining the sealability and the openability of the caulked cap 17 after molded as the bottle shaped container 1 18 AccordinO to the invention as apparent as described 19 above, the uneven surface is formed to vary the thickness of the primary preformed piece 22t Therefore, 21 the thickness of the bottle-shaped container blow-molded 22 can be simply controlled, thereby enhanoing the 23 mechanical strength of the bottle-shaped containr or 24 forming the bottle-shaped container I in the desired pattern by the variation of the thicknesa, 26 The primary preformed piece 22 is formed in a thin 21 tray shape, and tho recess groove 42 or the projecting Sstrip 43 is formed on the body portion 40 of the disc fshape, Therefore, the pretormed piece may be simply removed trom the injection imold after the molding, nd ro 1. j it is not ecessary to form the injection mold in a 2 special structure.

3 Then, a method of molding the bottle-shaped 4 container with a wide port will now be descrIbed in detail, 6 Figs. 9 and 10 are explanatory view* showing an 7 embodiment of a method of molding a primary preformed 8 piece of the invention, B A primary preformed piece 22 injection-mlded from 1$ ,Y thermoplastic synthetic resin such as polyethylene terephthalate, resin is constructed integrally with a 12 short qylionrical nec portion 81 at the peripheral edge 3 of a body portion 50 of disc shape, 14 The short cylindrical nek portion 51 is formed Integrally with a npoq edge portionR 53 at Obliquely IQ outwardly upwardly of a thick short Oylindrical. ncok 17: /i pg~rtion 0 and the nock edge portion is 5$r h1r formed in a cmurve sboe improved for the Qpenafi.it to:of a caulked cap on the OgUter lower peripheral surface toi""b2 0c i4 Andi a curved surface Improved form the soal$ability to tho packing (not shown) of the caulked cap on the uiaa~~~po tn~:B~g part 568 is perphorAlly~ u~po~~ r suface 55, A steppe( at5 spih?11~ "r 4.

BfeIrrnd on the outer peripho-ry of the continuous prt between th cylindrical nook, portion 6 2 nd the body 2 5 Povtion- 26 ~;The primary peforMod. piece 2 Of such structure is heat treated at. the cylindrical neck portion 51 by r~inp pcing on A prodtorminei jig- 67 prior to tile i4JAXit, 3 Thla ig 67 Ientixron bfmowomo din rt :30s.~ Thi# Ji T 67 i~ trmedr: for ~rasf. in; oylindrica~ T 4 cj'

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4 6 7 2t 26 11 s, s 4 d 2 i "o t 4 t 22rr 29 *p 4c g s 4J,3 shape to hold the primary ipreformed piece 22 in the state of supporting the stepped part 56 of the prefomed piece 22 by the upper end of the jig 57, to heat the cylindrical neck portion 51 from above and outside (as shown by an arrow in Fig, 9) and further to gradually cool the cylindrical neck portion 51, thereby crystallizing the portion, The short cylindrical necl portion 51 is sufficiently heated by this heat treatment, and srystallized, When the body portion 50 is heated and crystallized together with the cylindrical neck portion 51 in this case, the orientation blQw-molding of the body portion 50 cannot be achieved in the next step, Therefore, it is required to eliminate the crystaltization of the body portion 50 in the heating step, As means for preventing the occurrence of the crystallization of the body portion 50, it is preferable to heat the body portion 50 not to the temperature for c4using the crystallization of the body portion 580 As concrete means for blocking the heating of the body portion 50, it is preferable to utilize the jig 57 for blocking the radiation oX the heating bem to the body portion 50 ia shown in the embodimentk In the embodiment shown, the jig 67 of cylindrical shape is indicated- in contact at the upper Ond with the stepped phrt 56 as mreans for blooking the radintion of the heat beiam to the body portion 50 of the preformed piece 22, towever, in addition to the ig i 7, a Shield of a flqat disc shape for shielding the heat beam 'rom 1; above may be disposed directly above the body portion 2 in the cylindrical neck portion 51, 3 The primary preformed piece 22 and particularly 4 i the entire cylindrical neck potion 51 of the preformed piece 22 is softened1 by the heat treatment for 6 crystallizing the cylindrical neck portion 51 to become 7 readily deformable by the action of gravity. Since the cylindrqcal nek portion 51 is in, the state placed on the Jig 57,; no deformaton might occur by the action of 1o the gravity at the cylindrical nec portion 51, Thus, 11. j :eVen if the cylindrical neck portion is heat treated 1$ to be aZy-ta5llized, no improper deformation occurs upon 1h heat trating of the qylindrical nqok portion $1,o I n 14 this mat;ter, the cyltndrical. neck poztion S1. may be srystallized while Accurately mainotAnina the dimensions.

of the cylndrial neck por'tionr 51 at the time of 17 inljection molding, 18 After the 'tindrical neck< portion 61 is thUs Scrystallzed by the heat 'treatment as described Above, e",tiro pirmary preformed piece 22 and prticulary the body portion 50 of the pre9formed piece is heated to 22 the orionting tempe ratue, 4nd is blow-molded by 23,xil orientation to the bottle-shaped containr 1, Msre particularly, as apparent in Fig. 1O, the 2~ bottle-zhapd container 20 With a wide port is blow-rnolded a'2t thq body portian 50 of the primary J- 2 7 pretomed piece 22 to it body 58 and a bottom 59, and the Oy4tndrila neck potion 51 rmains kt, the cylindrical neq4 portion, 51 of the qpimary pretormed picu 22, Olnt tho method of moldLn as d onribed above, tho 4II vii, 1 i cylindrical neck portion 51 of the primary preformed 2 piece 22 is heat, treated prior to the biaxial 3 orientation blow-molding to crystallize in white color 4 the cylindrical neck portion 51, Thus, high rigidity can be provided at the cylindrical neck portion 51, and 6 the orienting force is not 4ccqrdingly effected 7 particularly to the neck edge portion 53 or the 8 cylindrical neck portion 51 at the biaxial orientation 9 blow- ding time of the body portion 50, the deformation such as strain of the neck edge portion 3 reqttirec4 Xor high dimensional 4cquracy might not: ocu, and sufficient mechanical durable strength can be 13 achieved against the clamping force of the cau11ed cap, 14 thereby holding the stble sealability to* the caulked 1 cap 16 since the cylindrical nook portion $2 of the hnocl 11 edge pcwtion 53 is, formed to be thick, the ootentitn 18 frore effected on the bod1y portion 50 can be absorbed 19 k oven by the cylindrical nqock portioni 0, and the orienting force to be affected to the neck edge portion "4Q can be entirely elimina.ted, '22 in Came of heat treating the cylindrical ndck' a3 portion Si1 the Jig 7i is used. Therefore, the heated 24 portion is not limited to tho eylindiienl neck portion S, thereby obviating the influence to the body portion 26 60, C-oqmc) uontly 1 the4 orientation of the body portin tmi- not obstructed, ;nd the p rmary preformed piece 211 iN hold by the Jig 67, thoreby eljminpatir the colnp** 2 of the shapo of the preformed ploce 22, V igs. 11 and 12 are explanatory views ahowing still '4*E ~i 1 ~i another embodiment of a method of molding a bottle-ahape1 2 1 container of the Invention, 3 When a bott.e-shpep container is molded by 4 thermoplastic resin such as polyethylene terephthlatet resinj the molding is ready and the molded container 6 having excellent quality can be provided, In, order to 7 provide heat resistance for the thermopl:otic rsin fbottle-shaped container, there is means for blw-moldIng 9 bY b1iaig orientation the synthetic roen by raising the mold temperature, When tha mold temperature to,, however, raised, a so-called "a0 sinkage" pheonomnon t2 doccurs in the -molded bottlo-shapod contaInpr if the 13 ii ~orienting magnificatin i not sVY selectecb a 14 strain occurs in the molded container, thereby diseWah provIcte a satisfactory molded bottleshAped ctnerr Nore priculy, in order to im~prove the heat 11 f resistance, orienting, crystal is Orown, and the 18 remining strain should be remo:ved,. The higher tho 9 I orienting magnification or the orre the biaxia 'P LI (Qrionttlif is employed, the more the orienting crystal increases Simulaneonusly, the, strain at the origing Si$nce the bott hytslined containe With et, wide port 4has lage dametur to the depth, sufficient orienting M~gniio~t o o the upper end of the body cannot pArtioslally obtined. There(aoro, it to diicu5tdt to 27 raisn the mold tcern*turo 1 In other words, in o~ro to bow-old by binxia4 -rdnion the bottlq-zihpeI *4 contai.ner of thormopli*tic ayinthetic runin having 3 Qxceflnt hitt relsitanoe, vtrious problm exist S-3 r I*

PI

I t The method of molding the bottle-shapecl container of the inventon co ntempplates to eliminate the 3d. E: b4vo-described draw b qs, And comprises the steps of 4 unl~xially Ortqnting mai.ndy the upper portion of, the body Q the bottle-shaped continor with, a wide port, b bita4xiay orienting the remainig yavt of the bdy and 7 the pelphera. end of th.e bottM, 4nd cfrtthe 8 $Oqenltaily shifting, trom, bixal orIo.npttion to the 9 tinIax4qd orlientation at tho btt=m from the pqripheral 1(anfd to thle cntra portion, 11 ri~r~, 11 shws a bottle"8hapod 0aotner I with A 2Wde port molded by this methocL A cylindrical body Qj Shaving 4 diameter slihtly larger than that of a 14 r1ing8hhpeXd cylindrical neck portion 60 i' araned oontinuously to the Qc OAndr l neck portion 3Q, a bottom 62 is cotinued to the lower end of the body Olt' 171 bttthe centrPa pa 03 of the:bottom Is inwardly 1 t 8 recesped, hQ upper part of the %k body 61. is set~b to 0, zonu A, th- romaiing part from the central. part to the low Sw0 part of the) body 61 and the peripheral end 64 of the bottom 62 re xot to ax zone 8, anid tho central part 63 of the bottom 62 Is zut to a zone C, 23 VI g 12 sehows a primary? preformod piece 22for moldi a. bott o-SAnedI container 1. with 4 wide port o the invention, The p rmary' pr eormed pe Wo 22 moldd fromt th oplxi zythtia rosin is cnotuced Integrally with a ringha-shpod ctlnfrical nook portion 00 At th(2 poriphqrl edg ot a diao portion 66 thle 9 peipihrad ond 60 of the disc portion 05 Im thlrn italcnd the conral part 6~ 7 l on the contrar- t thick, 94 i iE 1 The Above-descItrbed primary preformed piece 22 is 2 secured to a predetermined blowing mold 08 and 3 blow-rnolded by biaxal orientation, 4 1The bt4xal orientation blQW-moding is OeXQcted below, SAn orienting pin is oontaoted with the oenter of 7 the primary preformed pieoe 22 of a trayr $hape I tO which the, cylindricoal neik portion 6Q of the preformed pieoe 0 is as ooated fixedy with the prodetormined mold 68 to oW'inow cld the proPformed piece., In this qasoo -the ti bQttq-sh: pqd oontiner I s uniaEially oriented mnly 12 In the zone A tQ be ofented, Axially, Jiaxiealy oriented 1 in the one fl to be oriented bbi ially 3 and peqtueotia iy 14 1 ~hlf ted from bi:4'tiAl oriontation to uria4l orionttlon from zJn pthephea l end 04 of the botton 2 to the 16" c~oentr4l prt Os In the zone Q-tobe o riented, 1 ZIn the znr A 3 ,the diameter is slightly larger than K that of the cyltndricl neek portion 60 Aordingy, sufficient biaxial orientation cannot be "chieved, but '0 modingl strains increases to feanibly o.ause a ocle 2 E tI %,91nhra' due to the strain, I, this tVention the poripheral end 0 of the primatry preformed piece 22 to beconie the zone A is reue in thcnes 7'hereorq, 4 it iJV tit 1QA t Un±4t44i4t l orinted su:ffietly to onablo to peform the desrrd orientation, ILIl Intheone B, th ~:th cettra part 67 of the pr tijry 27~t i preforrod plcoQ 2 2I oren toC, and bittxind orietntitjl cPn be itccOrdingly sutfiiently performed,, I the zon oC, the oitrnl patrtc is not o ntod And the pqripheritl vnd, (84 14i bX#iX4A1 orentod,. ThU.

3

I

11 *e a

"I

td* I 6 t v *4 I c,~ i r: :1 ii molding strains are most feasibly produced. However, the aeritral part 6-7 of the primary preformed piece 22 is incresed in thickness and the central part 63 of the bottotp 62 to, be molded is formed, to be inwardly receesod. Therefore, the Qiqntation can be sequentially reduced from the peripheral end 64 toward the central part 63, thereby elimintatin the bcundary between the oriented portion and the non-oriented portion, Thus, the occurrence of ;he strains can be prevented in advance, According to the Methodt of the Invontion as Apparent fromn the abovementionect de~ ptdi, the upper part of the body 61 Is mAinly Uniia lly oriented, thereby growing the crystantlfll Ot. of unt iaXial j: dctlcn without r~ den PSPUI aLtf ns, and, biadal orentation Is perfored from the rermin1.nq part, of the b-od 61 to the peripheral end 04 010 the bottom 621 tjoroby growing the bliaally ovien-tisno or 'tAtl.

VLs thar, the bottom 02 i ssquentiall1.y shifted from the btd oxi en8tsa:tt: io theq un4, Nlil or1ntatJion from the periphera4 end 04, to the Cntral part 03,p thereby' gowqajn the d~esetee orentjn qrFgtal Then, a miethod of heittint the prinaryz prefrmgd eIOC of the I~nv tnion will now be decrbed in detail, Fg.13 hotg 18 are oplnatory views of tho hBating method of the Invention, In the method of blow-mojdldng k by, bINit orientattiona botlhaped container, the primatry preformed ptlaul Is heated to it predeterimned tompwraturoe

I

p~ior to thrsa ta~t~iri ii bw c~ladils- t i siot a rt realyf f I 11 14 16 11 S Is 9, 4 00 Q4 2( S21 9g 99 2 S23 ~9 9 10 aa :s* z OP orient the preformed piece, Since the primary preformed piece used for molding the conventional normal bottle-shaped container is formed in a bottomed cylindrial shape, the desired object can be acieved, for example, merely by rolling the preformed piece on a conveyor while heating the piece by a heater, However, the primary preformed piece of the tray shape constructed as described above is placed on, a predetermined jig, and the body portion is heated by 4 heater# For example, when the heat of the heated is uniformly emitted to the entire body portion of the disc shape, the temperature rsi~no velocity of the central, part of the body portion is much larger than that of the perlpher. lend of the body portion of the preformed piece# Thug, the hea, distributed state of the entire primary preformed piece thus heated becomes very irregular in the thermal distribution, rig j shows a tempet-ature ditribtion, of' the, primary, preformel piece, wherein n abcss sA, q is the postion of z'soidal section of the primary preforMod and a~n or~dinate EKs is be temerature A curve exhibits, the tmpratur stributicrn ,,haracteristicz of the case that the preformed, piece is heated by the means, Pere, the central part of the Ody portion Is honted to the vicinity of 12000, while the. periphaool odge is heated to Only approX. 100 0 CI ThUst, the tomper~ture distribution ia very irregular, and otefetive ortentation blow-inoldinK Oannot be Achieved, A4 deocribed Abov, when the primary prtfowrmad to*4 1 piece is irregularly heated, the molded bottle-shaped 2 container is formed in irregular thickness, desired 3 thickness cannot be controlled, and further the 4 characteristic by the orientation cannot be uniformly achieved as its drawbacks, 6 The heating method of the invention contemplates 7 to eliminate the above-described drawbacks, and can 8 liniformly heat the body portion by radiation heating the 9 1 vicinity of the peripheral edge as the boundary portion 4 H between the peripheral edge having large heat sink 1 degree and the central part having small heat sink i degree through a heater in the body portion of the 13 preformed piece of the tray shape se$ured to the jig, 14 i thereby relatively rotating the jig and the heater to (6 uniformly heat the body portion.

4Fig. 14 shows a primary preformed piece 22 of 17 thermoplastic synthetia resin to be heated of the Se tk 18 invention, A short cylindrical neck portion 71 is 4t t 19 constructed integrally with the peripheral edge of a 20 ody portion 70 of a disq shape, rtte The primary o preored pee 22 is secured to a 22 predetermined ig 72 in the state ot engaging the 2 3 cylindrical neck portion 71 in a laid attitude, a heater 24 1 72 having a hood oppositely to the body portion 70 of the preformed pioeas 22 engged with the jig 72 is c ldisposed at a predetermined interval, and the iR 72 27 and the heater 7a rotate relatively, S A, heater shiolding plate 74 is disposed at a 1 29 predetermined position between the jij 72 and the heater ndoe dr 7, and slits 16 of predetrmined wdth aro. formed 30 7/ 1 substantially in a ring shape of a predetermined 2 diameter at the heat shielding plate 74.

3 1 Therefore, the body portion 70 of the primary 4 preformed piece 22 of the jig 72 is heated via radiation through the slits 75 by the heat of the heater 73 while 6 relatively rotating the jig 72 and the heater 73, 7 thereby heating the body portion 8 The heat emitting position to the body portion 9 is the peripheral edge 76 having large heat sink degree of the body 70 and a peripheral end 78 substantially as 11 the boundary part to the central part 77 having small 12, heat sink degree so that the temperature rising velocity 13 of the peripheral edge 76 is substantially equalized to 14 that of the central part 77, thereby heating the entire body portion 70 substantially by uniform temperature, 16 Therefore, the mutual interval between the jig 72 17 and the heater 7$ ,and the diameter of the slits 75 of 18 the heat shielding plate 74 are set to heat via 19 radiation the predetermined position of the body portion t t 2* 2 70 by the heat from the heater 75, and the emitting heat 21 quantity and the emitting time of the heater 75 are set 22 corresponding to the predetermined temperature of the S23 body portion 4 Fig, 17 shows the heat transmitting state in the.

I body portion 70, The heat of the heater 75 is uniformly 26 emitted to the ring-shape peripheral end 78 along the 2 T slits 75 by the relative rotation of the heater 75 and S8 i the Jig; 72 along the oircumferentia direotion, and 2 the heat of the peripheral end 78 i, on one hand, radi&lly transmitted and acoumulated toward the central

U.

1 1 1 1 part 77, and, on the other hand, radially transmitted 2 toward the peripheral end. 76, and dissipated from the 3 peripheral end.

4 Fig. 18 shows another example of the heating m~ethod S of the invention.. A convex lens 79 is arranged in 6 coincidence with the axial center of the body portion 7 between the heat shielding plate 74 and the -jig 72, 8 ~thereby collecting the heat passed through the slit's 9 to the predetermined peripheral end 78 of the body portion 11, Therefore, the emitting position of the body 12 portion 70 can be simply set, 13~ According to the invention of the method of 14 heating the primary preformed piece, the body portion ofth primary prefoQrmed piece for 1,3,w-molding, by bt&4al orientation a bottleq-shape _cftainer with a t7 wide port integrat9d with, a short qylincdricl nec portion. at the peripheral edge of the body portion of 19~ d i.c shgpeocoan be heated to ~Uniform and adequate temperature prior to the biaxial orientation~ blow-molding, Th2erefore, the bott Ie -haped -ontainer With a wide port 22 can be very simply And accurately bl~ow-molded in~ a S23 simpl4e QperAtion with a simple structure, S24 rVis, 19 through 01 show a blowing mold for 41,W-m'odinK a tottle-shapod container With a wide port 26, from a prlmajy preformed piece of the tray shape 27 oruuro dosqribod above, 2$ The mold tor' blQw-fnldino by biaxial orientation the prmary preformod Piece of thormopla~tic synthetic rosin such 44 PelYv0~YldA(e torephthalate resin hAs a 1 holding jig disposed oppositely to the preformed piece, 2 a bottom mold disposed between the holding jig and the 3 bottom mold so as not to open by another pressure 4 element for supporting the holding jig at the blow-molding time.

When the primary preformed piece is formed in a 7 bottomed cylindrical shape used for molding the 8 conventional bottle-shaped container, the mold of the 9 structure constructed as described above is sufficient.

However, a primary preformed piece of a tray shape 11 in which a short cylindrical neck portion is 12 peripherally formed at the peripheral edge of the body 13 portion of disc shape is recently considered as the 14 primary preformed piece for molding a so-called "bottle-shaped container with a wide port" having almost 16 no difference between the diameter of the body and the 17 diameter of the cylindrical neck portion of the 18 bottle-shaped container. The primary preformed piece of 19 this structure is largely oriented in the body portion 0 by an orienting pin at the time of orientation S21t blow-molding, In this case, the association of the 22 molds become disadvantageously unstable by the increase 23 in the orientation blowing pressure, or the molds tend 44 24 toopen before the molding, The blowing mold of the invention is formed to 26 eliminate the above-described drawbacks and 27 I1 disadvantages, and constructed to be associated at the at" -8 side mold with the holding jig and the bottom mold in 29 j the orienting direction of the orienting pin.

S I 1 The primary preformed piece 22 for molding a Ii 1 bottle-shaped container 1 with a wide port is formed in 2 a tray shape peripherally integrated with a short 3 cylindrical neck portion 81 at the peripheral edge of 4 a body portion 80 disc shape, and injection-molded from thermoplastic synthetic resin in thickness 6 increased at the center of the body portion 80 as 7 compared with the peripheral edge, 8 Then, an orienting jig 82 is formed in a tapered 9 shape at the upper peripheral end 83, on which a holding groove 84 for engaging the cylindrical neck portion 81 1 of the primary preformed piece 22 is formed, and a 12 sealing ring 85 is arranged therein.

13 An orienting pin 86 is associated longitudinally 14 movably at the center of the holding Jig 82 in the state of penetrating the jig 82, and an engaging groove 87 is 16 peripherally formed on the matching surface of the molds 17 on the outer periphery of the holding jig 82, 18 A bottom mold 88 provided oppositely to the jig 19 82 is swelled at the lower center thereof to form the bottom of the bottle-shaped container 1, and an engaging 21 projecting strip 89 is peripherally formed on the 22 outer peripheral matching surfaces of the molds, 23 A side mold 90 for closing molds aa associated 24 sidewisely with the holding jig 82 and the bottom mold 88 has an engaging peripheral trp 91 formed on the 26 matching lower surface of the mold for engaging the 27 enaging groove 87 of the Jig 82, an engaging peripheral 28 goove 82 formed on the matching upper surface of the 29 mold for engaging the strip 89 of the bottom mold 88, and fuqther a holding mold 93 to become the mold surface 1 of the shoulder of the bottle-shaped container I for 2 blocking the outer periphery of the open part of the 3 groove 84 on the peripheral ends 83 of tapered shape on 4 the position corresponding to the peripheral end 83 of the jig 82.

6 In the structure described above, the cylindrical 7 neck portion 82 is engaged within the holding groove 84 in the attitude that the primary preformed piece 22 is 9 laid in the state that the orienting pin 86 of the tO holding jig 82 is not projeOted from the upper surface 11 but retracted to the retarding position, thereby 12 t associating the preformed piece 22 with the jig 82, 13 Then, the bottom mold $488 is moved down to a 14 predetermined position, and the side mold '9Q is further associated sidowisely with the bottom mold 8 Ia and the holding jig 82 to close the molds, t17 In this case, the engaging peripheral strip 01 of S18 the side mold Q90 is engaged with the engaging groove 87 19 of the jig 82, and the engaging peripheral groove 92 is engaged with the engaging projecting strip 89 of the .2 bottom mold 88, Accordingly, -the bottom mold 88 is particularly ditspoed 4ways at a predetermined interval 23 to the jig 82. Thus, the orienting pin 80 is moved 24 forwardly, and even if strong orientation blowihg pressure is applied to the primary preformed piece 22, 26 the molds are not moved upwardly in A. mold opening 27 direction.

V2 28 When the side mold 00 is tloaed a holding mold 03 A: 29 is Placed on the peripheral .nd 88 oX the jig 82 to block the outer pe ripheral nde of the holding groove i (2~ii Pf I 1 84, Therefore, tpe primary preformed pieqe 22 becomes 2 at the cylindrical neck portion 81 impossible to be removed from the holding groove 84, the cylindrica1 neck h portion 81 is completely pressed into the groove 84 and Sheld in the groove 84, closely contacted with' the 6 1 sealing ring 85 to obtain the seglability at the 7 blow-moding time and to fix the cylindrical neck I portion 81 to the holding jig 82, 0 iAccording to the invention as evident from the Aforementioned description, the molding machine is U cOnstructed to Ovati-onally engage the holding- jig 82 12 Rnd the bottom mold 88 throulgh the sicie mold 0O,, and the jig 82 and tho mold 88 are partica~laly engaged ftrml ~i in i,,e ornting direqtion of the orienting' pin $6* Therefore, evn it lazOQ axial orientation blowin pressa is applied to the body portlon 80 of the 1 primary preformed piec,-e 22 of a tray shape used for S i; mqldi-n the bottle-shaped contaIner I with A -Wide port, the molds At'e not Qpened, 21 it S28 3 0,

Claims (10)

1. A primary preformed piece for use in the formation of a blow molded bottle shaped container of blaxially oriented thermoplastic synthetic resin the container having container body with a relatively wide port; the primary preformed piece comprising: a generally disc shaped body portion which is capable of being oriented to form the container body of the container Including a bottom wall of the container body, the disc-shaped body portion including a central section and a peripheral edge section of reduced thickness relative to the central section; a neck portion including a generally cylindrical section and an outer edge section which when the primary preformed piece is ian upright attitud, projects from the cylindrical section in a generally oblique fashion with respect to the body portion outwardly and upwardly said cylindrical section being secured to the peripheral edge portion of the body portion In a Junction region S there being further provided a stepped section disposed In the Junction region said edge section of said neck portion having a curved outer lower peripheral surface and a curved upper surface.

2, The primary preformed piece according to claim I further including a 20 peripheral strip projecting from an Inner peripheral surface of said neck portion.

The primary preformed piece according to claim I or claim 2 wherein said body portion has an outer surface and an inner surface and has a recess 25 groove and/or a projection at least one of said surfaces thereof.

4, !a 4, The primary preformed piece according to claim 3 wherein said recess groove Is formed on one of either the outer or Inner surfaces of said body portion and said projection Is formed on te other of the outer or Inner surfaces of said body portion. It 81al~f~drrti I ip,35/4 A method of molding, a blow molded bottle shape cotainer of biaxallyotd thermoplastic synthetic resinr With a Wide port us a primary preformed piece according to any one of the preceding claimns, tthe method comprising the steps of-, forming the primary preformed piece,, hetiting said primary preformed piece.

In a manner so as to thermally crystallise said neck portion; and thereafter blow molding by, biaxial orientation said, body portion to formn the bottle shaped container.

6. A method, of molding a blow molded bottle shapedl cont-iner of blwally oriented thermopistc synthetic resin with a Wide port using a primary preformed piece According to any one of claims I to 4o the method Comprising tetpsof: 1 Wally Orienting the': primary preformed pilce at on orienting, rate whereby the. container so formed has a hoight more than ten times, the original depth. thereof,, and, radially orienting In a relatively small degree the primary preformed piece to form the container,

7, A mnethiod ot radiatiot heating a primary preformed' piece according to any one of claims I to 4 said mreth od comprising the stepsq or:- foringtheprmary preformed piece; radiation hleating the body portion Ii a region of* (t boundary of 2$ between the, central section and the pt-ripheral edge section by relatively rotating said primary preformed piece and the heater so that the rate of temperature Increase at the peripheral edge section having large heat sink degree Is substantially equal to the rate of teMperature Increase at tha CenOa sction having small' hents sink degre.

So The method according to clalut 7, Wherein the neck portion Is supported 910 4.*~4~243I$/~4 -37 by a, jig in an Inverted attitude, a heater Is disposed at. a predetermined Interval from, the body portion, a beat shielding plate with slits Is disposed between the Jig and the heater, the jig and the heater are, rotated relative to one another,

9. The. method according to claim 8 wherein a convex lens Is disposed between the Jig and the shielding plate, and the body portion Is generally co, axially disposed with an, axial centre of the lens,

10. A method of mnolcing. 4 blow molded bottle shaped container of biaxially; oriented thermoptastloc synthetic. resin with a, wide port using a primary preformed piceo according to any one of claims I to 4s said method comprising the steps or-, unia. ially orienin an perart of h yprin 1$ b ~iaxaly oretn the remlnn part of sold body portion anld the peripheral edge section-, and- oriftis th cann art or thec bottom In sochi a maner that the orientation Is sequentially shifted from biaxiail orietation to u4nlaxial orietaton romthe perlpheral edge section to the coeInal section. II, A molding machine for bWow molding blw Mole otesae cowtiner of biaxia0ly oriented thermoplastic synthetic res* wit aidport by bj.,,,tially orienting thle primfary preformed piece 4cQodn to any one of li to 4, the molding macine comprising: a hiolding jig hatving a holdig groove for engain~g wnd holding tfie neck portion of the primatry preformed piece and tin orienting pin, the orienting pin becing longttudinally Movable at the centre oif (lhe holding jig: a bottom Mold disposed oppositelY to maid jid g f$ and n side mold which Is engaged with stild hiolding jig and the bottoarn wold from sides of the( jig aind (thc bottom miold so naq to 0l1m Ch jgnd lhe bottomn m-old In. ain oritng, direction~ to InhiWA rMOa of thle neck portion 9lO~4Ardt4~O~$/MA x k from the holding groove, 121 The molding machine according to claim 11, wherein said holdlq.' jig further has, an engaging groove; said bottom mold Is swelled at a, centre of t lower stitface therof, and further has an engaging projection strip;, and said Wie mold further has an engaging peripheral strip to, be engaged with the engaging groove, and on ensgin$ peripheral, groove to be engagedO with the engaging projection strip, Da Oted tfils 23rd day of Jaoary, 1991 YOXHINO 190GyO$FO co. Lm,~ flY PAWINT AnIT0RNEYS IDAVtES 64 COLLSON 1$ £1- 4~ 4* 4, 4 4* 4 4 4* I 4*