CN100513136C

CN100513136C - Stretch blow molding method for grippable bottle

Info

Publication number: CN100513136C
Application number: CNB2004800208841A
Authority: CN
Inventors: 高田实
Original assignee: Nissei ASB Machine Co Ltd
Current assignee: Nissei ASB Machine Co Ltd
Priority date: 2004-05-19
Filing date: 2004-05-19
Publication date: 2009-07-15
Anticipated expiration: 2024-05-19
Also published as: WO2005110861A1; CN1826266A

Abstract

A stretch blow molding method for molding a grippable bottle with a holding recessed part at a body part without using special blow cavity dies, wherein a stretching rod (16) is inserted from the opening side of a preform (12), the blow cavity dies (10) and (10) with projected parts for molding the holding recessed part are moved to the preform (12) after a vertical axis stretching step for stretching the preform (12) in the vertical axis direction is started to complete the clamping of the blow cavity molds (10) and (10).

Description

The stretch blow molding method of grippable bottle

Technical field

The present invention relates to a kind of stretch blow molding method of synthetic resin container, particularly relate to a kind of stretch blow molding method that on the trunk of this container, has the grippable bottle of recess.

Background technology

Direct motivation of the present invention is the container that edible oil is used.

In countries in Asia, edible oil extensively adopts " the opinion component is sold " this method.The consumer buys required component in the shop, oil is packed into take away in the container miscellaneous.

But, in recent years, be filled in the PET container made edible oil gradually by widely the circulation peddle.From health aspect and circulation cost, the advantage of this mode is conspicuous.

In some area, the handlebar edible oil is directly poured the way in the pot that is placed on the fire into.At this moment, as the container of holding properly down well, at first just consider make the handle that separately is shaped with container and container integrated container with handles.But this type generally is not easy to be shaped, and cost also increases easily.And, because the material of grip member is also undesirable from the viewpoint that container reclaims.

According to these research, the applicant thinks that in the container that edible oil is used, the grippable bottle that is provided with the recess of being convenient to grip on trunk is promising.Consider the situation the when housewife uses in the kitchen, worked out following design: the width of handle part is little, recess is dark, and finger tangles easily.

, when being shaped recess darker on the trunk of the container of PET system, adopting common biaxial stretch blow molding is difficult sometimes.

The applicant in the shaping of PET system lemon juice beverage bottle, studied similar problem in the past.The recess that utilization attenuates to the trunk inboard on the trunk of lemon juice beverage bottle, and make the glass marble in the container can not drop to the bottom.The recess of this trunk has formed very narrow space in the inboard of container.

In recent years, consider on trunk, to have the trend of the oriented PETG of synthetic resin container (to call " PET " in the following text) the container made transformation of recess like this from the necessity that reclaims.In the past, as shown in Figure 9, the container 1 that on trunk, has the PET system of recess 6 like this, be special

blow cavity mold

10,10 inside behind matched moulds, utilize 16 pairs of extension rods to have the preform 12 of bottom tube-like to carry out longitudinal axis extension and utilizing the high pressure blow air it to be carried out in the shaping way of horizontal expansion, recess finishing die 13,13 is gone out to preform 12 side pressures, thus the recess 6 that is shaped (with reference to No. 3074616 communique of utility model registration).

Adopt this stretch blow molding method, owing to under

blow cavity mold

10,10 is in the state of matched moulds, carry out longitudinal axis extension process and high pressure blowing operation, thereby need the recess finishing die 13,13 that can advance and retreat independently.In order to drive this recess finishing die 13,13 it is independently advanced and retreat, just need the hydraulic cylinder 14,14 and the

piston

15,15 of recess finishing die 13,13 usefulness, also need the hydraulic circuit that makes their work in addition.

Summary of the invention

The object of the present invention is to provide a kind of stretch blow molding method, it is shaped under the situation of not using special blow cavity mold and has the grippable bottle of recess on trunk.

To achieve these goals, in the stretch blow molding method of grippable bottle a kind of mode of the present invention, that on trunk, have recess, it is characterized in that, comprising: longitudinal axis extension process, insert extension rod from the open side of preform, this preform is extended along y direction; The matched moulds operation after above-mentioned longitudinal axis extension process begins, makes blow cavity mold advance with respect to above-mentioned preform, finishes the matched moulds of this blow cavity mold, and described blow cavity mold has the protuberance that is used to form above-mentioned recess; High pressure blowing operation after above-mentioned matched moulds operation is finished, imports the high pressure blow air in above-mentioned preform.

According to this mode of the present invention, beginning longitudinal axis extension process before finishing the matched moulds of blow cavity mold, so do not use the metal pattern of complicated high price in the past, just can be shaped has the grippable bottle of bigger recess on trunk.In addition, by the longitudinal axis extension process that is undertaken by extension rod, can easily adjust the Thickness Distribution of preform on y direction.

Wherein, above-mentioned longitudinal axis extension process can or import the low pressure blow air in the longitudinal axis extension driving beginning of above-mentioned extension rod afterwards.

Like this,, can prevent that extension rod from contacting with the preform inner surface at the longitudinal axis extension process of preform midway.

And then, can be after above-mentioned longitudinal axis extension process be finished, by advancing of above-mentioned blow cavity mold, the surface of the above-mentioned preform after making raised part and the longitudinal axis extending contacts.

Like this, after utilizing the Thickness Distribution of longitudinal axis extension process adjustment grippable bottle on y direction, protuberance contacts with the preform surface, and protuberance can not hinder the adjustment of the Thickness Distribution of y direction thus.And, can prevent to extend the scratch that contacts the preform surface that causes midway owing to preform with protuberance at the longitudinal axis.

Description of drawings

Fig. 1 is the front view of the grippable bottle of an embodiment of the present invention.

Fig. 2 is the right side view of the grippable bottle of an embodiment of the present invention.

Fig. 3 is the rearview of the grippable bottle of an embodiment of the present invention.

Fig. 4 is the stereogram of the grippable bottle of an embodiment of the present invention.

Fig. 5 is the figure of the preceding state of expression extending blow moulding.

Fig. 6 is the figure of expression longitudinal axis extension process.

Fig. 7 is the figure of expression matched moulds operation and high pressure blowing operation.

Fig. 8 is the figure of the state behind the expression extending blow moulding.

Fig. 9 is the figure of expression extending blow moulding operation in the past.

The specific embodiment

Below with regard to embodiments of the present invention, be elaborated with reference to accompanying drawing.

Fig. 1～Fig. 8 is the figure of the stretch blow molding method of explanation an embodiment of the present invention.Fig. 1 is the front view of grippable bottle 1, Fig. 2 is the right side view of grippable bottle, Fig. 3 is the rearview of grippable bottle, Fig. 4 is the stereogram of grippable bottle, Fig. 5 is the figure of the preceding state of expression extending blow moulding, Fig. 6 is the figure of expression matched moulds operation and high pressure blowing operation for the figure of expression longitudinal axis extension process, Fig. 7, and Fig. 8 is the figure of the state behind the expression extending blow moulding.

As shown in Figure 1, this synthetic resin for example the grippable bottle 1 of PET system have: the neck 2 of opening, trunk 3 cylindraceous and have the bottom 4 at the dome shape protuberance end shown in the dotted line roughly.The trunk 3 of grippable bottle 1 has: smooth label paste section 7, and it is positioned at the face side of grippable bottle 1, is surrounded by shallow slot on every side; Control with

recess

8,8, as shown in Figures 2 and 3, it is to the inboard of trunk 3 depression; A plurality of endless grooves 9, its circumferencial direction along trunk 3 forms.

Control with

recess

8,8, in about trunk 3, respectively be formed with a place in the stage casing of the short transverse of grippable bottle 1.As shown in Figure 3, the opposition side of the label paste section 7 on trunk 3 promptly in the rear side of trunk 3, is clipped in the wall portion of controlling with the trunk 3 between the

recess

8,8 and forms handle part 80.After having adorned thing in the grippable bottle 1, its buyer can put into one to thumb and control with recess 8, remaining finger is put into another control with recess 8, holds handle part 80 and carrying grippable bottle 1.

Below, describe the manufacturing process of this grippable bottle 1 in detail with Fig. 5～Fig. 8.

(input operation)

Fig. 5 is the skeleton diagram of the extending blow moulding metal mould device of extending blow moulding portion 100, begins the figure of preceding state for the expression extending blow moulding.In the stretch blow molding method of present embodiment, utilize the preform forming section in advance, by injection moulding or compression molding, the preform that bottom tube-like is arranged 12 of the neck 2 that to have opening of being shaped.Preform 12 is imported in the not shown heating part that disposes with split of preform forming section or one.In the heating part, utilize heating arrangements such as a plurality of infrared heaters, preform 12 is heated to the temperature that is suitable for extending except that neck 2.

As shown in Figure 5, reach the preform 12 of the temperature that is suitable for extending, be supported on the transfer unit 11, be transfused to and stop in the blow molding portion 100 with handstand state.In blow molding portion 100, have:

blow cavity mold

10,10, it is configured in the both sides of preform 12, is the composite die of die opening state; Neck

guide

20,20, it slidably is arranged on the bottom of

blow cavity mold

10,10; Bed die 18, it is configured in the top of preform.

Neck guide

20,20 is made of a pair of composite die of the neck 2 that keeps preform 12.It is driven with

blow cavity mold

10,10 and with respect to preform 12 advance and retreat, but by not shown elastomeric element, is configured to compare with

blow cavity mold

10,10 advance to preform one side (application of force) state of certain distance.Therefore, if

blow cavity mold

10,10 is advanced with respect to preform 12, then before

blow cavity mold

10,10 matched moulds were finished, at

first neck guide

20,20 can keep the neck 2 of preform 12.

In order to form the controlling with

recess

8,8 of grippable bottle 1, the cavity surface of

blow cavity mold

10,10 is side-prominent and be formed with

protuberance

21,21 to preform one.For the ease of understanding the forming process of

protuberance

21,21 and preform 12, Fig. 5～Fig. 7 represents the longitudinal section of

blow cavity mold

10,10 with

protuberance

21,21.

(longitudinal axis extension process)

Then, as shown in Figure 6, the

blow cavity mold

10,10 of composite die form advances to preform 12 1 sides with

neck guide

20,20, at first

stops neck guide

20,20 maintains the state of neck 2 from both sides under.At this moment,

blow cavity mold

10,10 is the state before the matched moulds, reserves the distance of following degree and stops, and makes the

protuberance

21,21 that is formed on the

blow cavity mold

10,10 not reach the outer surface of the preform 12 in the longitudinal axis extension process promptly, at least.The switching of

blow cavity mold

10,10, by not shown mold closing mechanism for example hydraulic means carry out.The Halfway Stopping of the mould assembling action of such

blow cavity mold

10,10, can carry out in the following manner, promptly, by after being arranged on the locational sensor of Halfway Stopping between the

blow cavity mold

10,10 and detecting

blow cavity mold

10,10, make the magnetic valve of hydraulic means not have effect (ニユ-トラ Le), stop mould assembling action thus.In addition, stopping more accurately under the situation of moving, also can be except that the sensor, configuration cylinder etc. on assigned position and carry out enforceable stopping, thus make

blow cavity mold

10,10 Halfway Stopping.

In addition, when

blow cavity mold

10,10 advances, make bed die 18 drop to assigned position shown in Figure 6 and stop.

Then, from the below of transfer unit 11 extension rod 16 is carried out the longitudinal axis and extend driving, the bottom inside of one edge y direction pushing preform 12 is risen to bed die 18 sides, thereby preform 12 extends on one side on y direction.When preform 12 extended on y direction, the trunk of preform 12 attenuated, and in order not touch extension rod 16, imported a blow air of low pressure to the inside of preform 12.Prevent the inner surface scratch of preform 12 in longitudinal axis extension process like this.Be in

neck guide

20,20 keeps neck 2 from both sides state this moment, so extend driving even extension rod 16 is carried out the longitudinal axis, preform 12 can not float from transfer unit 11 yet.

The pressure of a blow air of low pressure is to make preform 12 not reach the degree of extension rod 16, for example can be 1.0MPa.In addition, can extend the driving beginning with the longitudinal axis of extension rod 16 simultaneously the importing opportunity of a blow air of low pressure, also can a little a little later import than it.In addition, for a blow air of low pressure, can import certain hour or a certain amount of after, close not shown air valve and stop the importing of gas, also can pass through the blowing that imports such discontinuity after the stipulated time once more.

In addition, the longitudinal axis of extension rod 16 extends driving, can begin in the moment that neck guide 20,20 maintains neck 2.Therefore, as long as

neck guide

20,20 keeping neck 2,,

blow cavity mold

10,10 is moved on and need not to stop then according to the longitudinal axis extension state of preform 12.

(matched moulds operation and high pressure blowing operation)

And then, as shown in Figure 7, after the longitudinal axis of extension rod 16 extend to drive and to finish, drive

blow cavity mold

10,10 it is advanced, carry out matched moulds, be close to up to the two, boost then and finish the matched moulds operation.High pressure blowing operation is meant, after the matched moulds of

blow cavity mold

10,10 is finished, the secondary blow air of importing high pressure is the air of 2.0MPa for example, and by by on the cavity surface that is pressed in

blow cavity mold

10,10 and figuration, thereby the grippable bottle 1 of the net shape that is shaped comprise trunk 3 and the bottom of controlling with recess 8,84.

Utilize the longitudinal axis of the preform 12 that extension rod 16 carries out to extend, can adjust final formed products and can control the Thickness Distribution of bottle 1 on y direction.Therefore, by after finishing at the longitudinal axis extension process of preform with

blow cavity mold

10,10 matched moulds, can under situation the about Thickness Distribution of the y direction of grippable bottle 1 not being exerted an influence, adjust.This be because: by making on

blow cavity mold

10,10 trunk of the preform 12 that controlling of forming extended with protuberance 21, the 21 contact longitudinal axis of recess shaping usefulness, the part of

protuberance

21,21 contacts plays the extension of bottom (being top among Fig. 7) on longitudinal direction and has stopped in fact.

And even before the longitudinal axis extension process of preform is finished, the matched moulds that also can begin blow

cavity mold

10,10 drives.In this case, the matched moulds driving of

blow cavity mold

10,10 is regulated opportunity, so that the

protuberance

21,21 that forms on

blow cavity mold

10,10 can not touch the side that the longitudinal axis extends preform 12 midway.Regulate for fear of delicate like this action, preferably do not reach in the scope of preform 12, make

blow cavity mold

10,10 standbies on the position of as close as possible preform 12 at the

protuberance

21,21 that is formed at

blow cavity mold

10,10.

In addition, when 4 grounded part is the withstand voltage shape of acute angle in the bottom, the matched moulds that also can carry out bed die 18 be later than

blow cavity mold

10,10 matched moulds, be shaped at the bottom of the so-called champagne.

After the matched moulds of

blow cavity mold

10,10 and bed die 18 is finished, import the secondary blow air of high pressure, afterwards, for example in the time about one second, utilize the secondary blow air to keep grippable bottle 1 at the appointed time by the state that is pressed on the

blow cavity mold

10,10.

(output operation)

Then, as shown in Figure 8, discharge the pressure-air in the grippable bottle 1, bed die 18 is risen, and

blow cavity mold

10,10 is retreated, carry out die sinking.The grippable bottle 1 that so just has been shaped, it has darker the controlling with

recess

8,8 of depression to the inside on trunk 3.Grippable bottle 1 is exported from blow molding portion 100 with the state that is bearing on the transfer unit 11, is transported to not shown bottle discharge portion then, takes out outside blow-moulding machine.

Like this, extend the zero hour at the longitudinal axis, make the state before the

blow cavity mold

10,10 with protuberance 21 is in matched moulds, and be set as the state that between preform 12 and protuberance 21, has sufficient preform longitudinal axis wider space, the longitudinal axis of preform 12 does not extend and can be hindered by protuberance 21 thus, can obtain the container of Thickness Distribution equilibrium on the whole.

And the present invention is not limited in present embodiment, in the scope of purport of the present invention, can be deformed into variety of way.

For example, blow air in the middle of also can using, its pressure is set at the intermediate pressure of blow air and secondary blow air.In this case, middle blow air is to extend midway at the longitudinal axis of preform, begins to be blown into when the

protuberance

21,21 of

blow cavity mold

10,10 will contact with the surface of preform 12, can also reduce the scratch that is caused by this

protuberance

21,21 thus.

In addition, in the present embodiment, to supporting, carry the blow molding apparatus of preform 12 to be illustrated by transfer unit 11, but also can be applied to inject in the extending blow moulding device, described injection extending blow moulding device all utilizes the lip coventry type die head coventry keeping neck 2 from the injection forming process of preform 12 to the extending blow moulding operation and carries.In this case, because neck 2 is being held in the forming process always, so even when utilizing extension rod 16 to carry out longitudinal axis extension driving, also can keep reliably to preform 12.

Claims

1. A stretch blow molding method for a handleable bottle having an open neck and a bottomed cylindrical body portion, the body portion having a recess for holding, characterized in that:

include:

In the longitudinal axis stretching process, in the state before closing the blow molding die, an extension rod is inserted from the opening side of the preform to extend the preform in the longitudinal direction. The blow die integrally has a For the convex part forming the above-mentioned holding concave part;

In the mold clamping process, after the above-mentioned longitudinal axis extending process starts, the blow molding die is advanced relative to the above-mentioned preform, and the mold clamping of the blow molding die is completed;

In the high-pressure blow molding process, after the above mold clamping process is completed, high-pressure blow molding air is introduced into the above-mentioned preform.

2. The stretch blow molding method of a grippable bottle according to claim 1, wherein in the longitudinal stretching step, low-pressure blow air is introduced at the same time as or after the longitudinal stretching drive of the stretch rod is started.

3. The stretch blow molding method of a grippable bottle according to claim 1 or 2, characterized in that, after the above-mentioned longitudinal axis stretching process is completed, the above-mentioned convex part and the longitudinal axis are stretched by advancing the above-mentioned blow molding die. After the surface contact of the above preform.

4. The stretch blow molding method of a handleable bottle according to claim 1 or 2, characterized in that it comprises:

The step of advancing the blow molding die to a standby position where the protrusions approach the preform before longitudinal stretching, before starting the longitudinal stretching step; and

A step of further advancing the blow die from the standby position after starting the longitudinal stretching step, and bringing the protrusions into contact with the surface of the longitudinally stretched preform after the longitudinal stretching step is completed.