NZ627288B2 - In-mould handle movement mechanism - Google Patents
In-mould handle movement mechanism Download PDFInfo
- Publication number
- NZ627288B2 NZ627288B2 NZ627288A NZ62728812A NZ627288B2 NZ 627288 B2 NZ627288 B2 NZ 627288B2 NZ 627288 A NZ627288 A NZ 627288A NZ 62728812 A NZ62728812 A NZ 62728812A NZ 627288 B2 NZ627288 B2 NZ 627288B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- handle
- block
- preform
- container
- stretch blow
- Prior art date
Links
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 238000000071 blow moulding Methods 0.000 claims abstract description 26
- 150000002500 ions Chemical class 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 240000003139 Ferula foetida Species 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 230000000875 corresponding Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
Classifications
-
- B29B2911/14513—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
- B29C2049/2021—Inserts characterised by the material or type
- B29C2049/2034—Attachments, e.g. hooks to hold or hang the blown article
- B29C2049/2039—Handles, e.g. handles or grips on bottles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4807—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by movable mould parts in the mould halves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
Abstract
Disclosed is an in-mould, handle movement mechanism for repositioning a lower portion of a handle of a stretch blow-moulded container from its initial, as injection moulded location on a body of an injection moulded preform, to a desired integrally attached position on the stretch blow-moulded container. The mechanism comprises an insert portion located in each half of a stretch blow-moulding die; each the insert portion includes a first fixed section located in a main block of the insert portion. The first fixed section is provided with a channel for location of an upper portion of the handle. The insert portion further includes a pivoting block adapted to nest a lower portion of the handle; the pivoting block rotating the lower portion into the desired integrally attached position by a linkage and an actuator. The mechanism further includes a forming block moveable between a retracted position and an extended position at which an outer surface of the forming block completes a contour surface of a container forming cavity of the stretch blow-moulding die. iner. The mechanism comprises an insert portion located in each half of a stretch blow-moulding die; each the insert portion includes a first fixed section located in a main block of the insert portion. The first fixed section is provided with a channel for location of an upper portion of the handle. The insert portion further includes a pivoting block adapted to nest a lower portion of the handle; the pivoting block rotating the lower portion into the desired integrally attached position by a linkage and an actuator. The mechanism further includes a forming block moveable between a retracted position and an extended position at which an outer surface of the forming block completes a contour surface of a container forming cavity of the stretch blow-moulding die.
Description
IN-MDULD HANDLE MOVEMENT MECHANISM
The present ion relates to injection stretch
blOW*moulded containers and, more particularly, to such
containers formed of bi—axially oriented thermoplastic
polymer.
BACKGROUND
The s of injection stretch. blow—moulding of
thermoplastic polymer, in which an injection d perform
is stretched. both axially and radially in a blow moulding
operation, results in. a biaxial orientation of the polymer
with increased tensile strength, less permeation due to
tighter alignment of the molecular structure, high impact
strength and transparenCy. As well, a container formed of
polyethylene terephthalate (PET) is light in weight and lends
itself to recycling.
ts have been made to incorporate integral
handles in PET and like injection h blow moulding
containers. A successful process developed by the present
ant is disclosed. in for example /030883. While
this produces a satisfactory handle, the
process process
employed cannot biaxially stretch the material of the handle
nor consequently to degree the region between the
connection points of the handle to the preform. To achieve the
required strength of the handle requires a form which is less
pleasing aesthetically and is expensive in the amount of
polymer required in its formation.
It is an object of the present ion to address
or at least rate some of the above disadvantages.
NOTES
The term “comprising” (and grammatical variations
f) is used in this ication in the inclusive sense
of “having” or “including”, and not in the exclusive sense of
“consisting only of”.
The above discussion of the prior art in the
Background. of the invention, is not an admission that any
information discussed therein is citable prior art or part of
the common l knowledge of persons skilled in the art in
any country.
In this specification, the term “perform” refers to
an injection moulded article, also known in the industry as a
“parison”, from which a container is formed by the process of
stretch blow—moulding.
BRIEF DESCRIPTION OF INVENTION
Accordingly, in a first broad form of the invention,
there is ed an in—mould, handle movement mechanism for
repositioning a lower portion of a handle of a stretch blow—
d container from its initial, as injection moulded
location. on a body of an injection, moulded m, to a
desired. integrally attached position on said stretch blow—
moulded container; terized in that said mechanism
comprises an insert n located in each half of a h
blow—moulding die; each said insert portion including a first
fixed section located in a main block of said insert portion;
said first fixed n provided with a channel for location
of an upper portion of said handle; said insert portion
further‘ including 23 pivoting‘ block adapted, to nest a lower
portion of said handle; said pivoting block rotating said
lower portion into said desired integrally attached position
by a linkage and an actuator; said mechanism further including
a forming block moveable between a ted position and an
extended position at which an outer surface of said forming
block completes a contour surface of a container forming
cavity of said stretch blow—moulding die.
Preferably, said mechanism comprises two mirror
reversed said insert portions, each insert portion inserted
into one half of said stretch blow—moulding die.
Preferably, said. handle portion of said ion
moulded preform comprises a central section having a generally
flattened elliptical cross section and thickened sections
adjacent each first and second on point of said handle
portion with a tubular body portion of said preform.
Preferably, said. thickened sections are cated
sections of said handle portion.
Preferably, outer ends of each of said first fixed
section and said pivoting block are formed as bifurcated
channels; said. thickened. bifurcated sections of said. handle
portion adapted to nest in said bifurcated channels.
Preferably, said pivoting block is rotated n a
first initial position conforming to said handle as injection
moulded with said preform, and a second on; rotation of
said. pivoting' block effected. by a linkage connection. to a
linear actuator.
Preferably, rotation of said pivoting block is
monitored by a sensor.
Preferably, an outer surface of said forming block
is flush with outer surfaces of said main block of said insert
portion and of said ng block.
Preferably, said pivoting block commences rotation
from said initial position as axial stretching of said preform
occurs in said stretch blow—moulding die; said second junction
point moving from. its initial prefornt position. towards its
on on said container.
Preferably, said channel is formed so that
substantially all sections of said handle portion experience
movement as said rotates from. said first initial on
towards said position on said container; said movement
inducing l ation of polymer material forming said
handle portion.
In another broad. fOIHI of the ion, there is
provided a method of moving a handle portion from a
disposition relative an injection moulded preform to a desired
disposition relative to a container; said. container stretch
blow—moulded from said preform; said steps including:
(a) inserting one half of a handle moving mechanism into
each half of a stretch blow—moulding die,
(b) inserting a preeheated injection moulded preform
comprising' a tubular body' n and handle portion
into said stretch blow—moulding die such that said
handle portion ii; nested jjl channels provided iJ1 each
half of said Rechanism when said die is closed for a
mould cycle,
(c) stretching said m. axially while rotating a
pivot block in each said mechanism from an initial
position conforming to said injection moulded handle
portion, to move a junction point of said handle portion
with said m, to a junction point of said handle
portion and said container,
(d) extending a forming block from a retracted position
at which an outer surface of said forming block
completes a contour surface of a container forming
cavity of said stretch oulding die.
Preferably, said movement of said handle portion
junction. point fronl said initial position. to said junction
point of said handle portion on said container cause l
orientation of polymer material of said handle portion.
Preferably, polymer‘ material of said. tubular body
portion of said injection d preform and said handle are
subjected to movement during said stretch oulding cycle
such that substantially all of said container body and said
handle are biaxially oriented.
[002l] Preferably, said handle n comprises a strap
portion having a generally flattened elliptical section; said
strap portion extending substantially the length of said
handle portion.
Preferably, said strap portion extends between
thickened. portions adjacent each of said first and second
junction points.
Preferably, said thickened, portions are 'bifurcated
such that each junction point comprises two areas of
tion between said container and said handle.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the present invention will now be
described with reference to the accompanying drawings wherein:
Figure l is a side View of an injection oulded
container with integral handle according to prior art.
Figure 2 is a side View of an ion. moulded
m with integral handle portion,
Figure 3 is a composite side view of the preform of
Figure 2 and a container stretch blow moulded from the
preform, showing the nt of the handle,
Figure 4 is a perspective view of one half of the
in~mould handle Hmvement imn according to {a preferred
embodiment of the invention, in a first operating position,
Figure 5 is a perspective View of the one half of
the ld handle movement mechanism. of Figure 4, in a
second operating on,
Figure 6 is a side view of the mechanism of Figures
3 and 4 shown in the position of Figure 4,
Figure 7 is a side view of the mechanism of Figures
3 and 4 shown in the position of Figure 5,
Figure 8 is a general view of the preform and blown
container of Figures 1 and 2 in the cavity of the blow
moulding die and shows the handle movement mechanism insert
with the handle in its initial and final positions.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 shows an injection stretch blow—moulded
container 10 with an integral handle 12 attached at a first
junction point 14 below the neck portion 16 and at a second
on point 18 to the body 20 of the container. The handle
has retained essentially the same shape as it had when
injection Emulded with the preform from which the container
was blown, so that the al of the handle has not been
subjected to biaxial orientation. To make the handle
sufficiently strong, it has in this example of the prior art,
been formed as an “I” beam in section.
The preform 100 shown in Figure 2, is conventionally
injection. moulded, in. a process well known in the art. The
preform 100, for use with the mechanism of the present
invention, comprises a r body 110 ing from a
threaded neck portion 112 and provided with a handle portion
114. Handle n 114, which has been injection moulded
along with the tubular body and is thus integral to, or one of
a piece and homogenous with it, is joined to the tubular body
110 at a first junction point 116 just below the neck portion
112, and. at a second junction point 118 lower down. on the
tubular body 110.
Preferably, the handle portion 114 is in the form of
a narrow strap of a generally flattened elliptical section A~A
as shown. in Figure 2A along most of its , but is
thickened and bifurcated proximate both first junction point
_10_
116 and second on point 118, as shown as section B—B in
Figure 2B. Thus preferably each junction point comprises two,
slightly spaced apart connections to the preform, and
uently to the container.
Typically, an injection stretch oulding
is a two stage with the ion moulding of
process process
the preform being separated both in time and place from the
subsequent stretch blow~moulding phase. In that case the
prefornt must be preheated. before it is introduced. into the
stretch blow—moulding die.
Only those portions of the preform 100 that are to
be stretched and blown are heated, with the neck portion 112
shielded during the heating process. With the preform of
Figure 2 for use with the handle moving' isnx of the
invention, the preheating of the preform. 100 is carefully
controlled with shielding and air flow arranged to
differentially preheat various areas of the preform. This
precision preheating allows expansion of different sections of
the preform to proceed at ent rates to achieve the
particular requirements of the handle moving operation.
Figure 3 shows the original preform 100 (as it was
injection moulded and shown in Figure 2), and the ner
120 after the blow—moulding process and handle movement. It
_11_
can be seen that the position of the second junction point 118
on the preform 100, has moved to a new position 118’ on the
blown container 120. The flow of the preform material, at and
adjacent the second on point 118, preconditioned by the
pre~heating, and as a result of the blowing s and
control of the Rechanism, ensures the second junction point
118’ is located at the desired position on the container 120.
The ism for moving the handle to the position
118’ as shown in Figure 3, will now be described with
reference to Figures 4 to 7. The object 130, shown in these
Figures, is one of two inserts comprising the mechanism, each
insert being the mirror reverse of the other so that the
corresponding opposing surfaces of the second insert (not
shown) matches and. is brought into close contact with the
outer surfaces (indicated by shading in Figure 4 to 7) o; the
illustrated insert.
These halves of the mechanism are inserted into each
respective half 140 of the blow Inoulding' die (as shown. in
Figure 8) with the outer es flush with the facing
surfaces the two die halves. The s are so placed that
the channel 132 is dent with the handle portion 114 of
the preform 100 when this is placed in the blow~moulding die
in preparation for the stretch blow—moulding phase. Although
the following description. is with. reference to just one of
these inserts of the ism of the invention, it will be
understood that the two inserts operate in concert during the
mould cycle.
It can be seen that the channel 132 into which the
handle portion 114 of the preform 100 is nested, is comprised
of a fixed section 132A machined into the main insert block
134 and a ng section 132B formed in a pivoting block
136. The bifurcated portions at the first and second junction
points 116 and 118 respectively are captured 'in the
corresponding bifurcated sections 138 and. 140 at the
respective outcr ends of fixed section 132A and the pivoting
section 132B of the channel 132.
Lying ately below the pivoting block 136, is a
forming block 142, nested in a recess 144 of the main insert
block 134. Forming block 142 is guided in the direction normal
to the upper surfaces (shaded surfaces) of the main insert
block 134 and pivoting block 136. Once the pivoting block 136
has sufficiently rotated towards its position shown in Figures
and 7, the forming block 142 can be driven from its nested
retracted position shown in Figure 4 into a position where its
upper e 146 is then flush with the upper surfaces of the
main insert and pivoting blocks, as shown in Figure 5. The
forming block 142 provide a side surface 143 to complete the
_13_
contour surface of the container forming cavity of that half
of the stretch blow moulding die.
At the commencement of the stretch blow—moulding
cycle, the preform 100 is mechanically stretched axially. Some
air is also introduced into the preform at this stage.
Simultaneously, the pivot block 136 begins its rotation from
the initial on shown in Figure 4 and 5 towards its end
of cycle position shown in Figures 5 and 7, drawing the
softened preheated material of the preform around the second
junction point along with the captured handle junction point.
As soon as the pivot block 136 reaches a
ermined point nearing the end of its on, as
detected by a sensor (not shown), the forming block 142 is
driven into the on shown in Figure 5 and the main air
injection for the blow moulding takes place to form the
container 120 shown in Figures 3 and 8.
Pivoting block 136 is operated by a linkage 148 and
a linear actuator such as a pneumatic cylinder 150 shown in
Figures 6 and 7. As well, pivoting block 136 may be urged and
locked into its final blow—moulding position shown in Figures
and 7 by the sloping er 152 of the out—stroking
forming block 142.
It can be seen from the disposition and shape of the
handle portion 114 as injection moulded and shown in position
in the channel 132 in Figure 6, and its uent disposition
and shape 114’ as shown in Figure 7, that considerable
movement has occurred of the handle portion 114, as well as
the region. 119 between. the handle portion. first and. second
junction points 116 and 118’. Movement is apparent, adjacent
to both the thickened and bifurcated ends of the handle
portion, as well as of the central strap section. This
nt ensures l orientation of the polymer and
provides great strength. to the handle, which is integrally
attached to the blown container 120 as it was to the preform
100.
It will thus be apparent that, apart from the neck
portion 112 and a small n of the preform just below the
location ring 113 of the neck portion, all of the preform 100
is subjected to extensive Hmvement of the polymer al,
including the area between the first and second junction
points of the handle portion, which now also becomes biaxially
oriented. This area was subject to lly no movement and
little or no biaxial orientation in the container of the prior
art as disclosed. by the- applicant in earlier‘ patents. Thus
this area was one of relative weakness.
The l orientation which is inherent in the
handle vaement provided by the nachanism of the invention,
provides a handle which is not only tically pleasing and
very strong, but also provides a very significant amaterial
saving over the non—biaxially oriented. handle of the prior
art.
The above describes only some embodiments of the
present invention and modifications, obvious to those skilled
in the art, can be made thereto without departing from the
scope or the present invention.
—16-
Claims (11)
1. An in—mould, handle movement ism for repositioning a lower portion of a handle of a stretch blow~moulded container from its initial, as injection moulded location on a body of an injection moulded. prefornn to a desired. integrally attached position on said stretch blow—moulded container; characterized. in that said mechanisn1 comprises an insert portion located. in each. half of a stretch blow—moulding die; each said insert portion including a. first fixed section located i11 a main block of said insert portion; said first fixed n provided with a channel for location of an upper portion of said handle; said insert portion further including a ng block adapted to nest a lower‘ portion. of said. handle; said. pivoting’ block ng said lower portion into said desired integrally attached position. by a linkage and an actuator; said mechanism further including a forming block moveable between a ted position and an extended position at which an outer surface of said forming block completes a contour e of a container forming cavity of said stretch blow— moulding die.
The mechanism. of claim 1 wherein said mechanism comprises two mirror reversed said insert portions, each insert portion inserted into one half of [[a]] said stretch oulding die.
The mechanism of claims 1 or 2 n said handle portion of said injection moulded preform comprises a central section having a generally flattened elliptical cross n and thickened sections adjacent each first and second on point of said handle portion with a tubular body portion of said preform.
The ism. of claim 3 wherein said thickened sections are bifurcated sections of said handle portion.
The mechanism of claim 4 wherein outer ends of each of said first fixed section and said pivoting block are formed. as bifurcated. channels; said thickened bifurcated sections of said handle portion adapted to nest in said bifurcated channels.
The mechanism of any one of claims 2 to 5 wherein said pivoting block is rotated between a first initial position conforming to said handle as -18— injection moulded with said preform, and a second position; rotation of a pivoting block effected by a e connection to a linear actuator.
The mechanism of clamn 6 wherein rotation of said pivoting block is monitored by a sensor.
The mechanism of any one of claims 2 to.7 wherein an outer surface of said forming block is flush with outer surfaces of said. main block of said insert portion and of said pivoting block.
The mechanign of any one (If claims 2 ix) 8 wherein said pivoting block commences rotation from said initial position as axial hing of said preform occurs in said stretch blow—moulding die; said second junction point moving from its l preform position towards its on on said container.
10. The mechanisn1 of Claifll 9 wherein said channel is formed. so that substantially all sections of said handle portion ence movement as said pivoting block rotates from said first initial position towards said position on said container; said movement inducing biaxial orientation of polymer material forming said handle portion.
ll. A method of moving a handle portion from a disposition relative an ion moulded preform to a desired disposition ve to a container; said container stretch blow~moulded from. said. preform; said steps ing: (a) inserting one half of a handle moving mechanism into each half of a stretch oulding die, (b) inserting a pre—heated injection moulded preform comprising a tubular body portion and handle portion into said stretch blow—moulding die such that said handle portion is nested in channels provided in each half of said mechanism when said die is closed for a mould cycle, (c) stretching said preform axially while rotating a pivot block in each said mechanism from an initial on conforming to said injection moulded handle portion, to move a junction. point of said handle portion with said preform, to a junction point of said handle portion and said containerL (d) extending a forming block from a retracted position at which an outer e of said forming block completes a r surface of a container forming cavity of said stretch blow~moulding die. _20
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011905444A AU2011905444A0 (en) | 2011-12-24 | In mould handle movement mechanism | |
AU2011905444 | 2011-12-24 | ||
PCT/IB2012/002783 WO2013093610A1 (en) | 2011-12-24 | 2012-12-24 | In-mould handle movement mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ627288A NZ627288A (en) | 2016-03-31 |
NZ627288B2 true NZ627288B2 (en) | 2016-07-01 |
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