NZ613020B2 - Spindle for winding up coreless rolls of a plastic film - Google Patents
Spindle for winding up coreless rolls of a plastic film Download PDFInfo
- Publication number
- NZ613020B2 NZ613020B2 NZ613020A NZ61302012A NZ613020B2 NZ 613020 B2 NZ613020 B2 NZ 613020B2 NZ 613020 A NZ613020 A NZ 613020A NZ 61302012 A NZ61302012 A NZ 61302012A NZ 613020 B2 NZ613020 B2 NZ 613020B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- spindle
- winding
- plastic film
- hard chrome
- peripheral wall
- Prior art date
Links
- 238000004804 winding Methods 0.000 title claims abstract description 37
- 239000002985 plastic film Substances 0.000 title claims abstract description 27
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000002093 peripheral Effects 0.000 claims abstract description 17
- 238000005488 sandblasting Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 9
- 239000004576 sand Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229940035295 Ting Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000002035 prolonged Effects 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
- B65H19/2276—The web roll being driven by a winding mechanism of the coreless type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
- B65H19/30—Lifting, transporting, or removing the web roll; Inserting core
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
- B65H2401/10—Materials
- B65H2401/13—Coatings, paint or varnish
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/40—Shafts, cylinders, drums, spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
- B65H2406/113—Details of the part distributing the air cushion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/04—Kinds or types
- B65H75/08—Kinds or types of circular or polygonal cross-section
- B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
Abstract
Disclosed is a spindle suitable for winding up rolls of stretchable plastic film. The spindle comprises a tubular body (12) having a peripheral wall provided with an external surface (18) and least one coaxially extending internal chamber (14). The internal chamber (14) is connectable to a pressurised air source. A plurality of perforations (17) extend from the internal chamber (14) to the external surface (18) of the tubular body (12) for winding up rolls of plastic film. The peripheral wall is provided with a layer of hard chrome (19). The layer of hard chrome (19) has a sandblasted surface for winding up the stretchable plastic film. The sandblasted surface has an average roughness of between 6 and 6.5. ed air source. A plurality of perforations (17) extend from the internal chamber (14) to the external surface (18) of the tubular body (12) for winding up rolls of plastic film. The peripheral wall is provided with a layer of hard chrome (19). The layer of hard chrome (19) has a sandblasted surface for winding up the stretchable plastic film. The sandblasted surface has an average roughness of between 6 and 6.5.
Description
SPINDLE FOR WINDING UP CORELESS ROLLS OF A PLASTIC FILM
BACKGROUND OF THE INVENTION
The present invention relates to a spindle for winding up ss rolls of a
c film, in particular rolls of a stretchable plastic film suitable for
packaging and/or for wrapping palletized loads or other applications.
STATE OF THE ART
Stretchable plastic films, wound up in rolls, are typically used in the
packaging field, for example, to wrap and stabilize loads and/or goods
stacked on t pallets.
Generally, the plastic film is wound up on a small rigid tubular core in
paperboard or plastic material, which has to be threaded in advance on a
spindle of a winding machine to wound a plastic roll or manually used by a
handle to unwound the roll. The use of small rigid cores in paperboard or
plastic material is necessary in order to allow a proper winding of the c
film rolls, as well as to facilitate the withdrawal f at the end of the
winding step. r, the use of conventional small rigid tubular cores
necessarily involves some drawbacks in the provision and storage of new
tubular cores, as well as the disposal of the exhausted cores, with
associated increased costs.
The replacement of the conventional rolls of c film wound up on small
rigid cores, with coreless rolls, has long been sought, by directly forming the
rolls on a spindle that, after the removal from the winding machine, could be
withdrawn from the roll only after a preset period of time needed to allow the
roll to stabilize, in order to avoid any implosion risk.
In an attempt to improve this technology, it has also been proposed, both in
the packaging plastic film field, and in other fields, the use of drilled spindles
having a ate peripheral wall comprising a tubular chamber connectable
to a pressurised air source, and the supply of pressurised air through the
same spindle and the ated wall in order to cause a slight expansion of
the internal turns of the roll, and an air flow which facilitates the awal
of the roll without having to remove the spindle from the winding machine.
The use of a perforated spindle for winding up coreless rolls of a hable
plastic film is shown, for example, in WO-A—2006/012933 of the same
Applicant; other examples for winding up web material, for example, paper or
fabric, are described in US-A—5,337,968; US-A—6,186,436; and US-A—
6,595,458.
In particular, WO-A—2006/012933 discloses a spindle comprising a tubular
body provided with a peripheral wall that defines an internal chamber axially
extending along the spindle, which is connectable to a pressurised air
; the eral wall is provided with a plurality of perforations
extending from the internal chamber to the al surface of the spindle,
for winding up the plastic film and forming the roll.
In practice, the spindle is composed of a metal r body, the external
surface of which for winding up the film has to be suitably ground and made
perfectly smooth, so as to minimize the frictional forces which would prevent
the sliding and withdrawal of the roll; furthermore, the pressurised air that is
d through the spindle perforations causes a radial expansion and a
tion of the inner turns of the roll, thus allowing to easily withdrawing
the roll from the spindle, in the absence of frictional forces and without
causing any deformation of the same roll, or implosion of the inner turns
thereof.
However, during the use of such a spindle, a high compressed air
consumption has been noted, that is necessary, on the other hand, to cause
the radial expansion of the inner turns of the roll upon the withdrawal.
Besides a reduction of the compressed air consumption, there is also the
need to adhere automatically the plastic film to the external surface of the
e, at the beginning of the film winding step. This second need, which
partially contrasts with the need to reduce the frictional forces upon the
withdrawal of the roll, is incompatible with the previous one, and not easy to
solve.
In an attempt to partially obviate this drawback, US-A—5,337,968 suggests to
t the perforated spindle to a vacuum pump, at the beginning of the
winding step of the web material, so as to create a vacuum degree by
suctioning air through the spindle ations, in order to initially adhere the
web material against the external surface of the spindle.
Such a on, beside being constructively and functionally complex, is not
applicable to plastic film winding machines in which use is made of
compress air to cause the radial expansion of the inner turns of the roll upon
the withdrawal, since, in order to generate the powerful air jets necessary to
expand the turns of the roll, perforations are needed having a small
diameter, of the order of a millimetre, slightly r or smaller; on the
contrary, to draw the film and make it to pneumatically adhere to the spindle
at the beginning of the winding step, perforations would be needed having a
erably greater diameter, so as to generate a vacuum degree or
underpressure condition necessary to draw the film. These two operative
conditions are mutually incompatible, and it does not seem that they can co-
exist in a single spindle.
Finally, in the conventional spindles, in which the exit holes for air jet open
on a smooth e, that is deemed necessary to reduce the frictional
forces upon withdrawal of the rolls, awal difficulties have sometimes
occurred due to an geneous distribution of the pressurised air
cushioning n opposed surfaces of the spindle and the roll, presumably
due to an irregular radial expansion of the roll.
OBJECTS OF THE INVENTION
Therefore, the need exists to find a new and different solution, which allows
obviating the drawbacks indicated , by reducing the consumption of
pressurised air necessary to cause the radial expansion of the internal turns of
the roll during the removal.
Therefore an object of the invention is to provide a spindle suitable for winding
up coreless rolls of plastic films, in particular, stretchable films, which is
provided with a plurality of perforations for the generation of air jets and a film
winding surface ly ured to provide a low frictional force, as well as to
allow the creation of an uniform air ning along the entire spindle, during
the withdrawal step of a roll.
A further object of the invention is to e a e as defined , that is
also provided with a film winding surface, which is suitably treated to allow an
automatic adhesion of the plastic film at the ing of the winding of a roll, as
well as provided with a high hardness and wear and/or etching resistant
surface, while maintaining such features for a prolonged working period of time.
It is an alternative object of the invention to at least provide the public with a
useful alternative.
BRIEF DESCRIPTION OF THE INVENTION
What stated above can be achieved by a spindle suitable for winding up
coreless rolls of a plastic film, in particular a stretchable film, according to claim
According to the ion, a spindle suitable for winding up and removing
coreless rolls of a plastic film, as defined before, has been provided, wherein
the spindle comprises:
a tubular body having a peripheral wall and at least a coaxially
extending internal chamber, connectable to a pressurised air source; and
in which the peripheral wall of the e comprises a plurality of
perforations ing from the internal chamber to an external surface for
winding up a roll,
characterized in that
the peripheral wall of the spindle has a protective surface layer of hard
chrome defining the external surface for winding up the roll, having an
e roughness between 6 and 6.5 pm, obtained by sandblasting.
asting is a mechanical process by which it is aimed to erode the
surface portion of a material, by means of sand and air jets oriented against
the surface to be treated.
Sandblasting is frequently used for the surface cleaning of metals or
materials in general, or to etch writings and/or images on marble and stones,
as well as to confer to the treated surface a final aesthetical appearance.
At the end of a sandblasting operation, the d surface has a degree of
roughness that depends on both the dimensions of the grains of sand that
are used, and the re of the jet.
Generally, the dimensions of the sand grains can by average range from
about 0.250 mm to 1 mm, typically using grains of sand having greater
dimensions when ing on hard materials.
A typical sandblasting ion, sely to the needs of the present
invention, tends to roughen the treated surface and to increase the frictional
forces; furthermore, from the first tests that have been carried out, it has
been ascertained that an incorrect sandblasting, besides negatively
increasing the frictional forces, tends to create an excessive consumption of
compressed air. Therefore, sandblasting would seem completely unsuitable for a
surface treatment of spindles for winding up and removal of coreless rolls, in which
use is made of pressurised air jets in order to withdraw the roll at the end of the
winding step.
Against all expectations, instead, it has been ascertained that by carrying out a
sandblasting under preset conditions, both an initial automatic adhesion of the
plastic film to the sandblasted surface of the spindle, and the on of an
homogeneous air cushioning between the roll and the e, with consequent low
frictional force between the opposite surfaces of the roll and the spindle and a
reduced consumption of the pressurised air is made possible.
Unless the context clearly requires ise, throughout the description and claims
the terms “comprise”, “comprising” and the like are to be construed in an inclusive
sense, as opposed to an exclusive or exhaustive sense. That is, in the sense of
ding, but not limited to”.
BRIEF DESCRIPTION OF THE DRAWINGS
These and further characteristics of the spindle according to the t invention
will be more apparent from the following description and the annexed drawing, in
which:
Fig. 1 is a longitudinal cross-sectional view of the spindle;
Fig. 2 is an enlarged, cross-sectional view, taken along the line 2-2 of Fig. 1;
Fig. 3 is an enlarged detail of Fig. 2;
Fig. 4 shows a highly enlarged view of the asted surface of the spindle
of Fig. 1.
DETAILED DESCRIPTION OF THE INVENTION
Figs. 1 and 2 show a general spindle 10 le for winding up one or more rolls 11
of a plastic film, for example, a stretchable film. The spindle 10 comprises a r
body 12 in steel material, obtained for example by drawing, suitably ground with a
slight taper, for example, of 2 or 3 degrees, with a minimum diameter at the fore end
for the removal of the roll 11.
The tubular body 12 is fastened, for example welded at an end of a shaft 13,
by which the spindle 10 is supported in order to freely rotate; the tubular
body 12 of the spindle 10 has a peripheral wall defining an internal chamber
14 coaxially extending to the tubular body 12. The chamber 14 of the
spindle, at the fore end for the removal of the roll 11, is closed by a plug 15,
while the rear end can be made to communicate with a pressurised air
source through an air supply channel 16 longitudinally extending to the shaft
With reference again to Figs. 1 and 2, the peripheral wall of the tubular body
12 has a plurality of perforations 17 extending from the internal chamber 14
to an external e 18 for winding up the plastic film.
The spindle 10 can be of any external diameter, for e, ranging
between 35 and 100 mm, while the diameter of the holes or perforations 17
can be about 1 mm, slightly r or lower. The same number of the holes,
and the arrangement thereof, both angularly and along the udinal axis
of the spindle, can be any one, ing on the length and the outer
er of the spindle. In the example shown, the holes 17 are arranged at
a constant pitch, by alternately providing for holes 17 that are angularly
spaced apart by an angle ranging between 90° and 180°; however, any other
arrangement of the holes 17 is possible, with respect to the one that has
been shown.
According to the present ion, as shown in Fig. 2 and the enlarged
detail of Fig. 3, the tubular wall of the body 12 of the spindle has been
coated with a thin protective layer 19 of hard chrome, obtained by a so-
called “FLASH” deposition process, ting in a deposition of chrome
having an average thickness ranging between 8-15 pm, and a hardness
g, for example, between 1000 and 1200 HV.
The choice of the hard chrome FLASH logy, after several attempts,
has been made for both the possibility to distribute in a precise and uniform
manner the chrome layer 19 without the need for successive grinding
operations, and the lower difficulty in obtaining the required e
roughness by dry sandblasting, as explained herein below.
In fact, according to the most innovative aspect of the present invention, for
the objects defined , the external surface of the layer 19 of hard
chrome, defining the e 18 for winding up the roll 11, is subject to a dry
sandblasting process in order to form a rough surface having an average
roughness Ra ranging n 6 and 6.5 pm.
To the aims of the present invention, based on a conventional definition, by
average roughness Ra is meant the etic average of the absolute
values of all the ridges 19A and all the valleys 19B of the layer 19 of hard
chrome, measured along a sample length.
A number of tests have been d out with sand having different le
sizes; however, good results have been obtained by using grains of sand
having a same dimension ranging between 0.15 and 0.3 mm.
After several attempts, it has been concluded that the use of grains of sand
having a greater size would give rise to the risk of creating an excessively
high roughness, with consequent increase of the air amount to be supplied
to the spindle; furthermore, it would give rise to the risk of damaging the thin
chrome layer during the sandblasting process. Finally, excessively high
frictional forces would be created in those areas in which the air cushioning
would lack due to the excessive extent of roughness, which would hinder the
withdrawal of the roll 11.
Instead, from the tests that have been carried out, it has been ascertained
that by carrying out a dry sandblasting such as to create an average
roughness Ra having the values cited before, it is possible to meet two
cting need in a single spindle: the first need being to provide the
spindle with a rough surface suitable to allow an tic initial adhesion of
the plastic film, without having to te any air suction through the
ation; the second need being to provide the spindle with a degree of
roughness suitable to generate an neous rised air cushioning
upon withdrawal of the roll, with a considerably reduced pressurised air
consumption.
Since it is extremely difficult to represent the irregular profile of a
sandblasted surface, the detail of Fig. 3 has to be meant as merely indicative
of the l features of the layer 19 of chrome, after the sandblasting
process.
In turn, Fig. 4 shows, again as a way of example, the roughness
characteristics of the sandblasted surface 18 of the layer 19 of chrome of the
spindle according to the invention; from Figs. 3 and 4 it is noted that the
random sequence of ridges 19A and valleys 198 generates an infinity of
surface paths, with consequent homogeneous distribution of the air
flows, thus minimizing the contact , and, as a result, the frictional
forces against the plastic film during the withdrawal of the roll 11.
From what has been stated and shown in the example of the annexed
drawings, it will be apparent that a spindle suitable for winding up coreless
rolls of a plastic film in winding machines is provided, in which the e
comprises a tubular body connectable to a pressurised air source, the
peripheral wall of which is provided with a plurality of perforations for the
generation of air jets, and in which the peripheral wall of the spindle has a
thin coating of hard chrome, which has been suitably roughened by a
suitable dry sandblasting process in order to create a preset roughness
degree.
2012/055062
However, it is meant that what has been stated and shown with reference to
the annexed drawings, has been given only by way of illustration of the
general and tive characteristics of the spindle according to the
present invention. Therefore, other modifications or variations will be able to
be made to the spindle, or parts thereof, without for this departing from the
claims.
Claims (7)
1. A spindle suitable for winding up rolls of stretchable plastic film, the spindle comprising: a tubular body having a peripheral wall provided with an external surface; at least one internal chamber coaxially extending to the tubular body of the spindle, said 10 internal chamber being connectable to a pressurised air source; a plurality of perforations which extend on the peripheral wall of the spindle from the internal chamber to the external surface of the tubular body; wherein the external surface of the peripheral wall of the tubular body is provided with a flash deposition layer of hard chrome; 15 said flash deposition layer of hard chrome has a asted surface configured with an average roughness between 6 and 6.5µm.
2. The spindle ing to claim 1, wherein the sandblasted surface of the hard chrome layer has an average roughness (Ra) of between 6.2 and 6.3µm.
3. The spindle according to any one of the preceding claims, wherein the peripheral wall of the r body of the spindle comprises a FLASH layer of hard chrome, having a thickness n 8 and 15µm. 25
4. The spindle according to any one of the preceding claims, wherein the layer of hard chrome has a hardness between 1000 and 1200HV.
5. The spindle according to any one of the preceding claims, wherein the perforations are extending through the peripheral wall of the r body and the 30 layer of hard chrome in angularly spaced apart ons, in correspondence of cross planes spaced apart along a longitudinal axis of the e.
6. The spindle according to any one of the preceding claims, n the angular space between perforations ranges between 90° and 180°.
7. A spindle suitable for winding up rolls of stretchable plastic film ntially as herein described with reference to any one of the embodiments illustrated in the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000467A ITMI20110467A1 (en) | 2011-03-24 | 2011-03-24 | SPINDLE FOR THE WINDING OF REELS WITH THE SOUL OF A PLASTIC FILM |
PCT/EP2012/055062 WO2012126977A1 (en) | 2011-03-24 | 2012-03-22 | Spindle for winding up coreless rolls of a plastic film |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ613020A NZ613020A (en) | 2015-06-26 |
NZ613020B2 true NZ613020B2 (en) | 2015-09-29 |
Family
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