CN101112788A - Method for preparing die block for adapting the die of PET bottle formed through light blow-moulding - Google Patents

Method for preparing die block for adapting the die of PET bottle formed through light blow-moulding Download PDF

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Publication number
CN101112788A
CN101112788A CNA2007100299935A CN200710029993A CN101112788A CN 101112788 A CN101112788 A CN 101112788A CN A2007100299935 A CNA2007100299935 A CN A2007100299935A CN 200710029993 A CN200710029993 A CN 200710029993A CN 101112788 A CN101112788 A CN 101112788A
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bottle
die
pet bottle
circular arc
pet
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CNA2007100299935A
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Chinese (zh)
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CN100513138C (en
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谢国基
姜晓平
胡青春
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广东星联精密机械有限公司
华南理工大学
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Abstract

The invention discloses a preparation method suitable for PET bottle lightweight blow forming molding bottom die. The method respectively determines the PET bottom blow molding forming bottom die bottom side internal concave arc R1B, central convex arc R2B, fixed central arc R3B, rotary angle arc R4B and bottom side external arc R5B according to the bottom side internal concave arc R1A, central convex arc R2A, fixed central arc R3A, rotary angle arc R4A and the bottom side external arc R5A of the bottom bottle after the PET bottle is inflated and kept constant temperature; wherein, R1B=(0.60-1.00)R1A, R2B=(1.00-3.00)R2A, R3B=(0.60-1.00)R3A, R4B=(0.50-1.00)R4A, and R5B=(1.00-2.00)R5A. The method ensures the strength performance of the bottom bottle is effectively improved because of the deformation and ensures the application performance and quality of the PET bottle after lightweight.

Description

A kind of preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die

Technical field

The present invention relates to a kind of preparation method of the PET of adaptation bottle formed through light blow-moulding mold bottom die, belong to technology of die manufacturing, the particularly structural design of mould.

Background technology

At present, along with the rising of the prices of raw and semifnished materials and the reinforcement of people's environmental consciousness, the enterprise that produces PETG (PET) bottle payes attention to saving material more, make every effort to heavily satisfy the demands of consumers with lighter part, promptly under guaranteed capacity requirement situation, do the PET bottle more and more lighter, realize the PET bottle formed through light.The lightweight of PET bottle can realize by the different process method, as changing the moulding of container, selects the material of function admirable etc.No matter which kind of changes, PET bottle performance will satisfy following 2 requirements:

A. requirement of withstand voltage: fast pressurising adorned water bottle to 100psi, pressurize 30 seconds, the speed with the 10psi per second boosts to not explosion of 300psi then.

B. stress cracking requires: under the about 4.2kg condition of bottle internal gas pressure, bottle bottom branch is immersed in 0.2% the alkali lye, and flawless at the bottom of 15～30 minutes bottles of bottle blowing of looking for novelty, 1 hour is non-leakage.

Owing to after the bottle base lightweight, guarantee two requirements of a, b, the PET bottom structure has been proposed requirements at the higher level.At present domestic and international used mineral water bottle, particularly carbonic acid bottle are easy to steadily when bottle is placed, and the mid portion at the bottle end is the indent form, and mostly is designed at the bottom of the five fingers shape of indent.Therefore, when the mould of design bottle, a projective structure all need be designed in the bottom of respective bottle, this structure is the easiest defective that causes when the bottle blow molding, overweight as the bottom, central point is blocked up etc., behind the inflation filled drink, easily cause bottle explosion or seepage, thereby its bottle bottom moulding quality has a strong impact on the quality of whole bottle.

Bottle base does not have before the lightweight, relatively thick is generally arranged at the bottle bottom, the inflation before with the inflation after changes in bottom smaller, the residual stress that the bottle base injection moulding is produced is also less, the bottle bottom strength guarantees easily, so mould when design only needs get final product according to the definite bottle molded dimension designing mould structure of client's designing requirement (volume size, bottle diameter).And the general wall thickness in bottle bottom is less behind bottle formed through light, the inflation before with the inflation after changes in bottom bigger, the residual stress that the bottle base injection moulding is produced is also bigger, the bottle bottom strength be cannot say for sure to demonstrate,prove, not only need when therefore mould designs according to the definite bottle molded dimension of client's designing requirement (volume size, bottle diameter), and need consider the influence that the distortion after bottle inflation can causes.

Summary of the invention

After technical problem to be solved by this invention is to provide a kind of PET bottle formed through light, avoid during the blow molding of PET bottle producing that the bottom is overweight, central point is blocked up and satisfy the bottle requirement of withstand voltage and because of being subjected to the do not ftracture preparation method of blow molding mould bed die of requirement of stress effect.

Principle of the present invention: cavity dimension is to determine after adding given deflection according to the bottle molded dimension, to guarantee that plastic bottle is after the inflation can, produce a bigger work deflection and produce a resistance of deformation to guarantee bottle requirement of strength at work, just die structure size is to determine after adding given deflection according to the bottle molded dimension.

The present invention solves the problems of the technologies described above by following technical solution:

A kind of preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, the conventional steps that this mould is done, polishes, clears up, assembled through roughing, heat treatment, semifinishing, fine finishining, pincers is made; Determining to make the mold bottom die size comprises the steps:

(1) diameter phi that requires according to PET bottle volume is determined bottom level H:H=(0.2～0.5) φ;

(2), determine the diameter phi 1B in blow molding mould bed die chamber, φ 1B=(0.90-1.00) φ 1A according to bottle type diameter phi 1A behind the PET bottle inflation constant temperature; The diameter of φ 1A after for PET bottle inflation constant temperature;

(3) determine the blow molding mould bed die circular diameter φ 2B that centers according to a bottle end diameter phi 2A behind the PET bottle inflation constant temperature; φ 2B=(0.90-1.00) φ 2A; The center circular diameter of φ 2A after for PET bottle inflation constant temperature;

(4) bottom side indent circular arc R 1A, central protuberance circular arc R 2A, the circular arc R that centers 3A, corner circular arc R 4A and the bottom side external arc R5A according to the bottle end behind the PET bottle inflation constant temperature determines PET bottle blow molding mould bed die bottom side indent circular arc R 1B, central protuberance circular arc R 2B, the circular arc R that centers 3B, corner circular arc R 4B, bottom side external arc R5B respectively; Wherein, R1B=(0.60-1.00) R1A; R2B=(1.00-3.00) R2A; R3B=(0.60-1.00) R3A; R4B=(0.50-1.00) R4A; R5B=(1.00-2.00) R5A;

(5) determine the high H1B of PET bottle blow molding mould bed die convex center, H1B=(1.50-3.00) H1A according to the high H1A of bottle end convex center behind the PET bottle inflation constant temperature.

The present invention compared with prior art has following advantage and beneficial effect:

When the present invention prepares at PET bottle mold bottom die, the evenness of wall thickness energy of the mobile performance during according to the material blow molding, bottle, take into full account the PET material after blow molding, final structure intensity after deformation tendency during the inflation can at the bottom of the bottle and the constant temperature distortion, produce resistance of deformation in advance a job of design bottle type deflection, PET bottle mold bottom die mold cavity configuration size is determined after adding given deflection according to the bottle molded dimension, guaranteed that bottle bottom strength performance reaches effective raising because of distortion, and guaranteed serviceability and quality behind the PET bottle formed through light.

Description of drawings

Fig. 1 is for adapting to PET bottle formed through light blow-moulding mold bottom die and shaped bottle basal cross section structural representation.

Among the figure: the A line is the bottle sample cross section behind the plastic bottle inflation constant temperature, and the B line is the mold bottom cross section.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is done to describe further.

Fig. 1 is a kind of adaptation PET gassiness bottle formed through light blow-moulding mold bottom die schematic cross-section.The bottle sample of A line after for PET bottle inflation constant temperature cuts shape among the figure, and the B line is that mold bottom cuts shape.As shown in Figure 1, this adapts to the bottom side indent circular arc R 1B that PET gassiness bottle formed through light blow-moulding mold bottom die foreign steamer Guo is connected by camber line successively, and central protuberance circular arc R 2B, the circular arc R that centers 3B, corner circular arc R 4B, bottom side external arc R5B form.The circular arc R that wherein centers 3B is when guaranteeing that bottle blowing stretches, and shift phenomenon can not occur, if skew can cause the base material skewness, causes asymmetric expansion after the inflation, and the footing injustice is put shakiness, when more serious, the bottom partial fracture can occur.Bottom side indent circular arc R 1B and bottom internal pressure-resistant ability have direct relation, and general bottle diameter is big more, and R1B is corresponding to get big value, and the distribution of bottom plastic that the R1B value is unreasonable in addition also can influence bottle blowing the time causes the bottom stress cracking; Central protuberance circle R2B is when guaranteeing bottle blowing, bottom centre's plastics fully draw back, make the abundant cooling and shaping of center plastics, central protuberance circle R2B size is broken at the bottom of to bottle and stress has direct influence, and bottom side circular arc R 5B value expands to doleiform inflation rear lateral portion and withstand voltage, the anti-explosion of bottom is had direct influence; Corner circular arc R 4B is that bottle bottom side is connected circular arc with inner concave, its value to bottle at the bottom of withstand voltage sunken bottom ability and the inflation after the bottle end stationarity contact directly.

Same as above, R1A, R2A, R3A, R4A and R5A are respectively concave arc, central protuberance circular arc, the circular arc that centers, corner circular arc and bottom side external arc in the bottom side behind the PET bottle inflation constant temperature.PET bottle diameter is φ; Diameter behind the PET bottle inflation constant temperature is φ 1A; The diameter of blow molding mould bed die is φ 1B; The circular diameter that centers behind the PET bottle inflation constant temperature is φ 2A; The blow molding mould bed die circular diameter that centers is φ 2B; Bottom protrusion center height is H1A behind the PET bottle inflation constant temperature, and blow molding mould bed die convex center height is H1B.Because PET can outwards expand after containing the gas cylinder inflation, bottom shape changes, and the comprehensive function of the volume of this deformation and PET bottle, bottle weight, bottle aeration quantity, bottle test temperature, the high factor in the bottle end is relevant, after guaranteeing the PET bottle formed through light, avoid during its blow molding producing that the bottom is overweight, central point is blocked up and satisfy the bottle requirement of withstand voltage and require under the prerequisite because of do not ftractureed by the stress effect, by inventor's experiment repeatedly for many years, to simulation when, draw following relation: general φ 1A is bigger than φ 1B, and φ 1B is about (0.9～1.0) φ 1A; φ 2A is bigger than φ 2B, and φ 2B is about (0.9～1.0) φ 2A; R1A is bigger than R1B, and R1B is about (0.6～1.0) R1A; R2A is littler than R2B, and R2B is about (1.0-3.0) R2A; R3A is bigger than R3B, and R3B is about (0.6～1.0) R3A; R4A is bigger than R4B, and R4B is about (0.5～1.0) R4A; R5A is littler than R5B, and R5B is about (1.0～2.0) R5A; H1A is littler than H1B, and H1B is about (1.5～3.0) H1A.The mold bottom die size relationship of preparation has as following table 1 architectural feature:

Table 1

Title Scope Title Scope Bottle working diameter φ 1A According to client's designing requirement, volume size or plastic bottle diameter phi are determined Bottle diameter phi 1 (B) ??(0.90-1.00)φ1(A) Circular arc spherical crown diameter phi 2A in fixed ??(0.05～0.15)φ1(A) The circular arc spherical crown diameter phi that centers 2B ??(0.90-1.00)φ2(A) Bottom side indent circular arc R 1A ??(0.30～0.80)φ1(A) Bottom side indent circular arc R 1B ??(0.60-1.00)R1(A) Central protuberance circular arc R 2A ??(0.05～0.30)φ1(A) Central protuberance circular arc R 2B ??(1.00-3.00)R2(A) The circular arc R that centers 3A ??(0.05～0.30)φ1(A) The circular arc R that centers 3B ??(0.60-1.00)R3(A) Corner circular arc R 4A ??(0.10～0.30)φ1(A) Corner circular arc R 4B ??(0.50-1.00)R4(A) End outer arc R5A ??(0.30～1.50)φ1(A) End outer arc R5B ??(1.00-2.00)R5(A) The high H1A in center ??(0.01～0.10)φ1(A) The high H1B in center ??(1.50-3.00)H1(A)

Make to adapt to PET bottle formed through light blow-moulding mold bottom die time, earlier according to the volume size of client's designing requirement, be the plastic bottle diameter phi, determine bottom level H:

H＝(0.2～0.5)φ

Bottle type diameter phi 1A is behind the plastic bottle inflation constant temperature:

φ1A＝φ×K

In the formula:

K is for considering bottle volume, bottle weight, bottle aeration quantity, bottle test temperature, the high coefficient that the performance impact of bottle is introduced in the bottle end, and its span is 1～1.1.

All provide a number range in the table, the relevant size that is to say bed die is to add or deduct a certain numerical value on the relevant size basis of bottle sample, this number range is according to considering the PET material after blow molding, inflation can and the deformation tendency at the bottle end, constant temperature distortion back and the final structure intensity gained after the distortion.

Embodiment 1: the method for preparing 2500ml carbonated drink bottle blow mold bed die

According to volume 2500ml, determine plastic bottle diameter phi=107 earlier, get K=1.020

H=(0.2～0.5) φ=0.477 * 107=51 so

φ1(A)＝φ×K＝109.15

The relevant size of mold bottom die is as shown in table 2 below:

Table 2

Title Numerical value Title Numerical value ????φ1A ????109.15 ????φ1B ????107.85 ????φ2A ????6.30 ????φ2B ????6.05 ????R1A ????62.72 ????R1B ????54.36 ????R2A ????12.00 ????R2B ????28.73 ????R3A ????7.83 ????R3B ????7.39 ????R4A ????13.25 ????R4B ????12.53 ????R5A ????133.59 ????R5B ????169.22 ????H1A ????4.67 ????H1B ????10.28

Mould is installed to the making of carrying out the PET bottle on the bottle blowing machine after can passing through roughing → heat treatment → semifinishing → fine finishining → grinding and polishing → assembly production flow process.Roughing is meant that mainly available numerically controlled lathe or engine lathe are processed as CA6140 type lathe to blow molding mould bed die profile and die cavity turning processing.Heat treatment mainly is meant Ageing Treatment, eliminates machining stress, is common heat treatment; Semifinishing is meant mainly and processes the irregular die cavity face of blow molding mould bed die on the work in-process scheming bed that its surface roughness is less than 6.3 microns; The irregular die cavity face of blow molding mould bed die is processed in fine finishining on high-speed processing machine tool, its surface roughness is less than 1.6 microns; Grinding and polishing is meant to be handled blow molding mould bed die mold cavity surface, makes its surface roughness less than 0.8 micron; Assembling is meant packs the blow molding mould bed die in the mould into.

The making of PET bottle divides two kinds of forms: a kind of one-step method that is referred to as, another kind is referred to as two step method.The step of one-step method system bottle: with PET microsection manufacture PET bottle base, utilize the bottle base forming temperature simultaneously, finish by a PET equipment through the making that pre-blowing, high pressure blow, step such as pressurize is finished a PET bottle.Two step method is made bottle and is divided two steps, at first make a PET bottle base by blank machine from the PET section, then by the PET bottle blowing machine with PET bottle base secondary heating to stretchings/bottle blowing temperature (100～120 ℃), through pre-blowing, stretching, high pressure blow, step making PET bottle such as pressurize.Because two-step method blown bottle helps producing in enormous quantities and cost control, present embodiment is used two-step method blown bottle.After testing, PET gassiness bottom mould by the preparation of present embodiment method is used to make light weight PET bottle, can reach on the performance under 4.2kg inside casing spare, be soaked in 0.2% the alkali lye, 15～30 minutes flawlesses, 1 hour non-leakage, (having adorned liquid) pressurize is after 30 seconds under quick pressurising 100psi condition, speed with the 10psi per second rises to not explosion of 300psi, reach the instructions for use of the PET bottle of high air content fully, bed die has been reserved the distortion that contains after gas cylinder is inflated effectively, eliminated distortion to the bottom Effect on Performance, simultaneously on process that the PET bottle blowing is shaped and principle, take into full account extension property, promoted PET as far as possible and extended performance after being shaped end shape requirement.

Embodiment 2: the method for preparing 1250ml carbonated drink bottle blow mold bed die size

According to volume 1250ml, determine plastic bottle diameter phi=89.5 earlier, get K=1.012.

H=(0.2～0.5) φ=0.4 * 89.5=36 so

φ1(A)＝φ×K＝90.58

The relevant size of mold bottom die is as shown in table 3 below:

Table 3

Title Numerical value Title Numerical value ????φ1A ????90.58 ????φ1B ????90.22 ????φ2A ????6.51 ????φ2B ????6.05 ????R1A ????42.55 ????R1B ????41.24 ????R2A ????8.00 ????R2B ????21.81 ????R3A ????7.04 ????R3B ????6.13 ????R4A ????12.00 ????R4B ????9.59 ????R5A ????66.25 ????R5B ????101.57 ????H1A ????3.53 ????H1B ????7.56

The process of mould is with embodiment 1.After testing, PET gassiness bottom mould by table 3 design is used to make light weight PET bottle, can reach on the performance under 4.2kg inside casing spare, be soaked in 0.2% the alkali lye, 15～30 minutes flawlesses, 1 hour non-leakage, (having adorned liquid) pressurize is after 30 seconds under quick pressurising 100psi condition, speed with the 10psi per second rises to not explosion of 300psi, reach the instructions for use of the PET bottle of high air content fully, bed die has been reserved the distortion that contains after gas cylinder is inflated effectively, has eliminated distortion to the bottom Effect on Performance, simultaneously on process that the PET bottle blowing is shaped and principle, take into full account extension property, promoted PET as far as possible and extended performance after being shaped end shape requirement.

Embodiment 3

Here determine that with preparation 600ml carbonated drink bottle the process of blow mold bed die size and method provide a concrete example,, determine plastic bottle diameter phi=67.5, get K=1.017 earlier according to volume 600ml.

H=(0.2～0.5) φ=0.356 * 67.5=24 so

φ1(A)＝φ×K＝68.64

The relevant size of mold bottom die is as follows:

Title Numerical value Title Numerical value ????φ1A ????68.64 ????φ1B ????67.63 ????φ2A ????6.29 ????φ2B ????6.01 ????R1A ????33.74 ????R1B ????30.26 ????R2A ????7.50 ????R2B ????12.38 ????R3A ????7.67 ????R3B ????7.48 ????R4A ????9.78 ????R4B ????7.06 ????R5A ????42.23 ????R5B ????60.93 ????H1A ????2.47 ????H1B ????6.09

The process of mould is with embodiment 1.The light weight PET bottle of making by the PET gassiness bottom mould size of table 4 can reach on the performance under 4.2kg inside casing spare, be soaked in 0.2% the alkali lye, 15～30 minutes flawlesses, 1 hour non-leakage, (having adorned liquid) pressurize is after 30 seconds under quick pressurising 100psi condition, speed with the 10psi per second rises to not explosion of 300psi, reach the instructions for use of the PET bottle of high air content fully, bed die has been reserved the distortion that contains after gas cylinder is inflated effectively, eliminated distortion to the bottom Effect on Performance, simultaneously on process that the PET bottle blowing is shaped and principle, take into full account extension property, promoted PET as far as possible and extended performance after being shaped end shape requirement.

Claims (6)

1. preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, this mould is made through roughing, heat treatment, semifinishing, fine finishining, assembly routine step, it is characterized in that determining to make the mold bottom die size comprises the steps:
(1) diameter phi that requires according to PET bottle volume is determined bottom level H:H=(0.2～0.5) φ;
(2), determine the diameter phi 1B of blow molding mould bed die, φ 1B=(0.90-1.00) φ 1A according to bottle type diameter phi 1A behind the PET bottle inflation constant temperature; The diameter of φ 1A after for PET bottle inflation constant temperature;
(3) determine the blow molding mould bed die circular diameter φ 2B that centers according to a bottle end diameter phi 2A behind the PET bottle inflation constant temperature; φ 2B=(0.90-1.00) φ 2A; The center circular diameter of φ 2A after for PET bottle inflation constant temperature;
(4) bottom side indent circular arc R 1A, central protuberance circular arc R 2A, the circular arc R that centers 3A, corner circular arc R 4A and the bottom side external arc R5A according to the bottle end behind the PET bottle inflation constant temperature determines PET bottle blow molding mould bed die bottom side indent circular arc R 1B, central protuberance circular arc R 2B, the circular arc R that centers 3B, corner circular arc R 4B, bottom side external arc R5B respectively; Wherein, R1B=(0.60-1.00) R1A; R2B=(1.00-3.00) R2A; R3B=(0.60-1.00) R3A; R4B=(0.50-1.00) R4A; R5B=(1.00-2.00) R5A;
(5) determine the high H1B of PET bottle blow molding mould bed die convex center, H1B=(1.50-3.00) H1A according to the high H1A of bottle end convex center behind the PET bottle inflation constant temperature.
2. according to claim 1 preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, it is characterized in that described roughing is meant blow molding mould bed die profile and die cavity turning processing.
3. according to claim 1 preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, it is characterized in that described semifinishing is meant processes the irregular die cavity face of blow molding mould bed die on the work in-process scheming bed, its surface roughness is less than 6.3 microns.
4. according to claim 1 preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, it is characterized in that described fine finishining processes the irregular die cavity face of blow molding mould bed die on high-speed processing machine tool, its surface roughness is less than 1.6 microns.
5. according to claim 1 preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, it is characterized in that described grinding and polishing is meant blow molding mould bed die mold cavity surface is handled, make its surface roughness less than 0.8 micron.
6. according to claim 1 preparation method who adapts to PET bottle formed through light blow-moulding mold bottom die, it is characterized in that described φ 1B=(0.95-1.00) φ 1A.
CNB2007100299935A 2007-08-30 2007-08-30 Method for preparing die block for adapting the die of PET bottle formed through light blow-moulding CN100513138C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102039519A (en) * 2010-12-15 2011-05-04 重庆远达催化剂制造有限公司 Manufacturing process of high-precision extrusion die for DeNOx catalyst
CN104708275A (en) * 2015-02-05 2015-06-17 杭州模利机电科技有限公司 Machining method for top end face of concave ring
CN110524206A (en) * 2019-06-04 2019-12-03 江苏省送变电有限公司 A kind of production method of carbon fiber fixture die

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8705767A (en) * 1986-02-14 1988-02-09 Norderney Investments Ltd Improvements in / or relating to plastic material containers
US4865206A (en) * 1988-06-17 1989-09-12 Hoover Universal, Inc. Blow molded one-piece bottle
US6296471B1 (en) * 1998-08-26 2001-10-02 Crown Cork & Seal Technologies Corporation Mold used to form a footed container and base therefor
CN100398302C (en) * 2002-10-31 2008-07-02 株式会社吉野工业所 Blow-molded container and metal mold for blow molding

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102039519A (en) * 2010-12-15 2011-05-04 重庆远达催化剂制造有限公司 Manufacturing process of high-precision extrusion die for DeNOx catalyst
CN102039519B (en) * 2010-12-15 2012-07-11 重庆远达催化剂制造有限公司 Manufacturing process of high-precision extrusion die for DeNOx catalyst
CN104708275A (en) * 2015-02-05 2015-06-17 杭州模利机电科技有限公司 Machining method for top end face of concave ring
CN110524206A (en) * 2019-06-04 2019-12-03 江苏省送变电有限公司 A kind of production method of carbon fiber fixture die

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