Title of Invention

A METHOD OF FORMING A FLEXIBLE PLASTIC TUBE AND AN INTERMEDIATE PLASTIC FOR USE IN MAKING THE TUBE

Abstract In a method and apparatus wherein a container is formed, decorated by rotating the container and then the base of the contianer is cut off for a plastic tube, a container is formed with a diametral lug on the base to facilitate rotating the container during decorating. In another form, opposed diametral surfaces are provided on the lower end of the container adjacent the base. In another form, the diametral surfaces are arcuate. In another form, the lower end of the container includes a frustoconical surface. In another form, circumferentially spaced axial grooves are provided in the frustoconical surface.
Full Text

FIEXIBLE-TUBE AND METHOD OF MAKING
This application is a continuation in part of United States application Serial No. 08/228,048 filed April 15, 1994 and United State-; application Serial No, 08/493,837 filed June 22, 1995.
This indention relates to the manufacture of flexible tubes utilized for containing and dispensing viscous products such as personal ;*are products and the like.
Background and Stannary of the Involution
In one irethod of manufacture of such flexible tubes, a fitment defining a threaded neck is attached to an open-ended tube and then th In anotner method of making such flexible tubes, a hollow container having an integral neck is formed, as by blow molding, the base of the container is severed from the container, the container is placed on a mandrel whereupon decoration is applied to the 05:en-ended container, a closure is applied to the finish and then the container is filled through the open end and the open and is sealed.
Among t,'ie objectives of the present invention are to provide a flexible tube having exceptional decoration or indicia; which incorporate 3 a finish that requires no trimming; wherein the decoration can be applied by conventional sAk screening

equipment; where it decorating such as silk screen and heat transfer can be dene at high speeds; and wherein closures can be applied tc the flexible tubes with a higher torque and at higher speeds.
In accordance with the invention, the method of forming a flexible plastic tube comprises injection molding a finish having an opening, extruding a tube integrally with the finish by relevant movement of the finish with respect to an extruder orifice, moving tt =. finish axially away from the extruder orifice whi le continuing continuously extruding the tube, closing a blow meld about : ie extruded tube, blowing the tube into an integral containe:" body having a closed bottom, opening the molds to provide a;:, integral flexible tube with a finish thereon. Thereafter the m * thod consists of decorating the body wi th indicia, and cutting the closed end of the tube leaving an open-ended tube of the end opposite the f irtish, and applying a closure to the finish. Preferably a closure is applied before cutting the bottom from th-:* container. Preferably the closure is applied to the finish after decorating. Subsequently, the tube is filled through th-i open end and the open end is sealed. The step of decorating includes rotating the tube about the longitudinal axis of the tube vmile engaging the finish and bottom. The step of decorating preferably comprises rotating the container relative to a sill: screen printing device. The step of injection molding and extrusion molding preferably compr ises injecting a-'ic: c-xt rudino i ir Bar low dens i ty polyethylene. However, h igh

density polyethyle ne, low density polyethylene and polypropylene may be used.
In accordance with a further aspect of the invention, a container struccure is provided that facilitates handling, rotating and decorating the container before cuttir^j the closed end. The base c:: the container is provided with a single diametrical lug which is engaged by the complementary lug on the rotating chuck. In a further form of the container, the body of the container is strengthened by diametrically opposed surfaces which are arcuate in horizontal cross section and taper axially downwardly *nd inwardly toward the base of the container. In another form c: the container the entire lower end of the container is tapered axially downwardly and inwardly to form a frustoconical surface. In still further form of container, a plurality of cicur'iferentially spaced grooves our provided on the frusto-conica.. surface. In another form of container, the container is formed only with the frustoconical surface and grooves,,

Description of the Drawings
Fig. 1 is a diagram of the steps in making the flexible plastic tube embodying the invention.
Fig. 2 :.s a diagram of an apparatus for silk screen decorating of the container.
Fig. 3 is an elevational view of the container which is used to make the tube.
Fig. 4 is a top plan view.
Fig. 5 is a bottom plan view.
Fig. 6 ..s a fragmentary view of a portion of the lower end of the container.
Fig. 7 is a fragmentary part sectional view of a preferred method and apparatus for applying the closure.
Fig. 8 is a fragmentary part sectional elevational view of an apparatus for severing the bottom from the container after "it is decorated.
Fig. 9 is a diagram of a modified formed apparatus for silk screen decorating of a modified container.
Fig. 10 is an elevational view of a modified form of container.
Fig. 11 is a bottom plan view of the container shown in Fig. 10.
Fig. i;i is a top plan view of the container shown in Fig. 10.
Fig. 13 is a fragmentary enlarged elevational view of a portion of the base of the container shown in Fig. 10 as viewed from the right or left.

Fig. 1^ is a sectional view fragmentary taken along the line 14-14 ir Fig. 11.
Fig. 15 is an elevational view of a modified form of container.
Fig. 16 is a bottom plan view of the container shown
in Fig. 15. Fig. 17 is a fragmentary elevational view of a portion of the base of the container shown in Fig. 15 as viewed from the right or left,
Fig. 18 is an enlarged sectional view taken along the line 18-18 in Fig. 16.
Fig. IS1 is an elevational view of a modified form of container.
Fig. 20 is a bottom plan view of the container shown in Fig. 19.
Fig. 23. is a sectional view taken along the line 21-21 in Fig. 20.
Fig. 22 is a fragmentary enlarged view on an enlarged scale of a portion of the base of the container shown in Fig. 19 taken at encircled portion 22.
Fig. 2? is an elevational view of a modified form of container.
Fig. 2A is a bottom plan view of the container shown in Fig- 23.
Fig. 2t is a fragmentary elevational view of a portion of the base of Uhe container shown in Fig. 10 as viewed from the right or lef;.

Fig. 26 is an enlarged sectional view taken along the line 26-26 in Fig, 24
Description of the Preferred Embodiment
Referring to Fig, 1 which is a schematic view of the succession of steps A-F to produce a filled container, the first step A comprises making a hollow plastic container by a method and apparatus wherein the neck or finish of the container is first injection molded, then a tube is extruded integrally with the injection molded finish, molds are closed about the tube and the tube is down to form a container. Such a method and apparatus is shorn in U.S. Patents 2,710,987 and 2,911,673, incorporated herrin by reference, and embodied in what has become known as ^ BC-3 machine.
As further shown in Fig. 1, the hollow blown container is then applied w;lth indicia or decoration in one or more colors and designs through step B as may be desired. Step C of Fig. 1 shows applying a closure C to the container. The bottom of the container is then cut off as in step D leaving an open-ended tube as shown in step E. Step E shows the tube with the closure thereon as delivered to a customer. The purchaser of the open-ended tube fills the tube with the viscous product through the open end and then seals the open end as at F.
A clo^are can be applied either before or after decorating, herein shown as applied after the first decorating step B. Preferably, the closure is applied after decorating.

In accordance with the invention, the decorating steps are performed by rotating the container with respect to silk screen printer stations P, as shown in Fig. 2, by clamping the container and rotating the container relative to the station. Alternatively, decorating can be by heat bonding a label to the container or by applying a pressure sensitive label.
Referring to Figs. 3-6, the container preferably comprises the infection molded finish 10, the extruded side wall or body 11 sufficiently thin thickness that it is flexible, and the integral bottom wall 12 which is thicker and relatively rigid to allow for driving the tube to rotate the tube in the capping and decorating operations. The wall 11 is preferably of substantially r-onstant thickness, for example, + 0.006 in.
As shown in Figs. 5 and 6, the bottom wall 12 is formed with indentations or recesses 13, 14 which are utilized so that they can h The container is preferably made of linear low density polyethylene. A preferred composition is linear low density polyethylene having a dispersion index of greater than 5. However , high density polyethylene, low density polyethylene cr polypropylene * ay be used.
Referring to Figs. 7 and 8, a preferred form of apparatus is show;: in the aforementioned copending application

Serial No. 08/228,048 filed April 15, 1994, incorporated herein by reference.
Referring to Fig. 8, the apparatus for severing the bottom of a contenner comprises a lower star wheel 20 having recesses 21 for receiving the closures C on the inverted containers A and an associated guide rail 32. The apparatus also includes an upper star wheel 30 with recesses for the container body A and an associated guide rail 31. The upper end of the container is clamped by blocks 26/ 27 having recesses 28, 29 which are movable relative to one another to hold the upper end of the container A. A guillotine blade 24 is movable across the bottorr of the closure by a cylinder to sever the bottom of the container A along a plane that is at 90° to the vertical or longitudinal axis of the container A. The guillotine 24 is guided by guide surfaces 25 in the blocks 26, 27.
The apparatus of Fig. 7 is preferably positioned at a capping station adjacent a rotary turret 30 which is driven intermittently pa fit the capping station to apply the container to the closure. The apparatus shown in Fig. 8 is located at a trimming station and the turret 30 moves the inverted containers past the trimming station to sever the bottom of the container. A guide rail 32 retains the lower end of the capped container in recesses the lever star wheel during severing of the bottom of tne container.
In accordance with a further aspect of the invention, a container structure is provided that facilitates handling, rotating and decorating the container before cutting the closed

end. The base 42 of. blow molded container 40 is formed with a single diametrical, lug 44 which is engaged by the complementary lug 46 on the rotating chuck 48 (FIG. 9). Such a construction tends to rigidify the base such that the container 40 can be held and rotated more firmly for decorating. In addition, the lug construction provides a greater thickness than the side wall of the container and maximum surface for engagement by the lug 46 on chuck 43.
Referring to FIGS. 10-14, in a further form, the container 50 is f :>rmed with a diametral lug 44a. In addition, the body of the container 50 is strengthened by diametrically opposed surfaces :2 on the lower end of the container adjacent the base. Each sarface 52 has an arcuate upper end and and tapers axially downwardly and inwardly toward the base 54 of the container 50. Surfaces 52 function to structurally rigidify the base while simultaneously reducing the amount of parison stretch into the base, thereby increasing the thickness of plastic in that area.
Referring to FIGS. 15-18, in another form of the container 60, the entire annular lower end 62 of the container 60 is tapered axially downwardly and inwardly to form a frustoconical surtace. This functions to reduce the amount of parison stretch into the base, increasing the thickness of plastic in that area. In addition, opposed arcuate surfaces 64 are provided or the frustoconical surface.
Refer r it.g to FIGS. 19-21, in still further form of container 70, a plurality of circumferentially spaced grooves

72 our provided on the frustoconical surface 74. Opposed arcuate surfaces 76 are provided as in FIGS. 15-18. The grooves function to structurally ngidify the taper area of the base of the bottle.
Referring to FIGS. 23-26, in another form of container 80, the container is formed only with the frustoconical surface 82 and grooves 84.
Typical examples of containers used to make tubes in accordance with the invention comprise:
TABLE I
Diameter of Tube Body Wall Thickness (inches)
Min Nominal Max
2M 0.017 .020 .023
l-i/2" 0.015 .018 .021
1-J/8" 0.012 .015 .018
TABLE II
Along Lug Thickness
4 4a
44b .018
44c .025
44d .030
44e .031
44f .024
44g .015
The dep :h of the grooves was a radius of about 1/32".

It can thus be seen that there has been provided a method of forming a flexible plastic-tube comprising injection molding a finish having an opening, extruding a tube integrally with the finish by relevant movement of the finish with respect to an extruder orifice, moving the finish axially away from the extruder orifice vhile continuing continuously extruding the tube, closing a b..ow mold about the extruded tube, blowing the tube into an integral container body having a closed bottom, opening the molds to provide an integral flexible tube with a finish thereon. thereafter the method consists of decorating the body with incl.cia, and cutting the closed end of the tube leaving an open-ended tube of the end opposite the finish, and applying a closure to the finish. Preferably a closure is applied before cu: cing the bottom from the container. Preferably the closure is applied to the finish after decorating. Subsequently, the tube is filled through the open end and the open end is sealed. The step of decorating includes rotating the tube about thu longitudinal axis of the tube while engaging the finish and bottom. The step of decorating preferably comprises rotating the container relative to a silk screen printing device. The step of injection molding and extrusion molding preferably comprises injecting and extruding linear low density polyethylene. However, high density polyethylene, low density polyethy: sne or polypropylene may be used.
Furthe:, there is provided a container construction that facilitates decorating by conventional silk screening equipment whereir decorating such as silk screen and heat

transfer can be cone at high speeds; and wherein closures can be applied to the flexible tubes with a high torque and at higher speeds.



In the metho: of forming a flexible plastic tube for use in dispensing a viscous product which comprises
injection molilmg a neck finish having a shoulder portion and an opening in said neck finish,
extruding a tut moving the i::nsh axially away from the extruder while continuing continuously extruding said tube portion,
closing a blov blowing said tube portion into an integral container body having a closed bottom,
opening the molds to provide an integral container having an integral finish, a shoulder portion, a tubular body portion and a closed bottom,
decorating the body portion with indicia by engaging said neck finish.
rotating the container about its longitudinal axis during the decorating, and
thereafter cut;iag the closed bottom of the container leaving a flexible plastic tube having a finish, a shoulder p i.tion and a flexible tube portion having an open end,
the improverr int wherein
said step of bl:*«v molding comprises providing a single diametrical lug on said base of said container and said >tep of decorating comprises rotating the diametrical lug during decorating.

The method set forth in claim 1 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base.
3.
The metnod set forth in claim 2 wherein said step of forming diametrically opposed surfaces comprises forming each said surface such that it has an arcuate upper end and tapers axially downwardly and inwardly with respect to the tube portion toward the base.
4.
The met:od set forth in claim 1 wherein said step of blow molding comprises forming diametrically opposed surfaces on the iower end :f said container adjacent said base, and
said st;-»p of forming diametrically opposed surfaces comprises forming aach said surface such that it has an arcuate upper end and tape::s axially downwardly and inwardly with respect to the tube portion toward the base.
5. The method set forth in claim 1 wherein said step of blow molding said container comprises forming an annular lower end of the tube portion of the container adjacent said base which is tapered axially downwardly and inwardly forming a frustoconical surface.

6.
The method set forth in claim 5 including forming a plurality of circutiferentially spaced grooves extending axially on said frustoconical surface.
7. The method set forth in claim 6 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end :f said container adjacent said base.
8.
The method set forth in claim 7 wherein said step of forming diametric ••,lly opposed surfaces comprises forming each said surface such that it has an arcuate upper end and tapers axially downwardly and inwardly with respect to the tube portion toward the base.
9.
The method set forth in claim 1 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base, and
said st~p of forming diametrically opposed surfaces comprises forming each said surface such that it has an arcuate upper end and tape::s axially downwardly and inwardly with respect to the tube portion toward the base.

In the method of forming a flexible plastic tube for use in dispensing a viscous product which comprises
injection molding a neck finish having a shoulder portion and an opening in said neck finish,
extruding a n.be portion integrally with the finish by relative movement of the finish with respect to an extruder,
moving the finish axially away from the extruder while continuing continuously extruding said tube portion.
closing a bkw mold about the extruded tube, $
blowing said ube portion into an integral container by having a closed bottom.
opening the molds to provide an integral container having an integral finish, a shoulder portion, a tubular body portion and a closed bottom,
said step of b ow molding providing at least one recess on said base of said container,
decorating tht body portion with indicia by engaging said recess,
rotating the container about its longitudinal axis by rotating the recess during the decorating, and
thereafter cu; ing the closed bottom of the container leaving a flexible plastic tube having a finish, a shoulder portion and a flexible tube portion having an open end,
the improvement wherein
said step of bow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base.

The metnod set forth in claim 10 wherein said step of forming diametrically opposed surfaces comprises forming each said surface sucl that it has an arcuate upper end and tapers axially downwardly and inwardly with respect to the tube portion toward the base.
12.
The method set forth in, claim 10 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base, and
said si.ep of forming diametrically opj&sed surfaces comprises formin*; each said surface such that it has an arcuate upper end and tapirs axially downwardly and inwardly with respect to the tube portion toward the base.
13.
The method set forth in claim 10 wherein said step of blow molding said container comprises forming an annular lower end of the tube portion of the container adjacent said base which is tapered axially downwardly and inwardly forming a frustoconical surface.

14. Q
The met.hod set forth in claim 13 including forming a plurality of circ.mferentially spaced grooves extending axially on said frustoconxcal surface.
15. The method set forth in claim 14 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base.
16. The method set forth in claim 15 wherein said step of forming diametrically opposed surfaces comprises forming each said surface sucn that it has an arcuate upper end and tapers axially downwardly and inwardly with respect to the tube portion toward the base.
17.
The met.-nod set forth in claim 10 wherein said step of blow molding comprises forming diametrically opposed surfaces on the lower end of said container adjacent said base, and
said s:ep of forming diametrically opposed surfaces comprises forminc; each said surface such that it has an arcuate upper end and- tapnrs axially downwardly and inwardly with respect zo the tube portion toward the base.

18.
An intermediate plastic article for use"in making an open ended tube for dispensing viscous products comprising
an injection molded finish,
an integral shoulder portion,
an integral flexible tubular body portion of substantially uniform thickness, and
an integral closed bottom portion,
said shoulder portion and bottom portion have a greater thickness than sa.d tubular body portion,
a diametrical lug on the base of said bottom portion for engaging said container and rotating said container during decoration.
19. The int -rmediate plastic article set forth in claim
18 including diametrically opposed surfaces on the lower end of
said article adjacent said bottom portion.
20. The intermediate plastic article set forth in claim
19 wherein each said surface has an arcuate upper end and tapers
axially downwardly and inwardly with respect to the tube portions
toward the bottom portion.

21.
The intermediate plastic article set forth in claim 19 including an annular frustoconical surface on the lower end of said tube portion adjacent said bottom portion tapering downwardly and inwardly toward the body portion.
22.
The intermediate plastic article set forth in claim 21 including a plurality of circumferentially spaced grooves extending axially on said frustoconical surface.

An intermediate plastic article for use in making an open ended tube i:or dispensing viscous products comprising
an injection molded finish,
an integral shoulder portion,
an integral flexible tabular body portion of substantially uniform thickness, and
an integral closed bottom portion,
said shoulder portion and bottom portion have a greater thickness than said tubular body portion,
diametrically opposed surfaces on the lower end of the article adjacent waid body portion,
24.
The intermediate plastic article set forth in claim 23 wherein each said surface has an arcuate upper end and tapers axially downwardly and inwardly with respect to the tube portions toward the bottom portion.
25. The intermediate plastic article set f$rth in claim 23 including an a*nular frustoconical surface on the lower end of said tube por :ion adjacent said bottom portion tapering downwardly and inwardly toward the body portion.

26.
The intermediate plastic article set forth in claim 25 including a plurality of circumferentially spaced grooves extending axially on said frustoconical surface.
27.
An intermediate plastic article for use in making an open ended tube for dispensing viscous products comprising
an injection molded finish,
an integral shoulder portion,
an in:egral flexible tubular body portion of substantially un;.form thickness, and
an integral closed bottom portion,
said shoulder portion and bottom portion have a greater thickness than said tubular body portion,
an annular frustoconical surface on the lower end of said tube portion adjacent said body portion tapering downwardly and inwardly toward the body portion.
28. The intermediate plastic article set forth in claim 21 including a »; Lurality of circumf erentially spaced grooves extending axiall'/ on said frustoconical surface.

29. An improved method of forming a flexible plastic tube for use in dispensing a viscous product substantially as herein described with reference to the accompanying drawings.


Documents:

2356-mas-1997-abstract.pdf

2356-mas-1997-assignment.pdf

2356-mas-1997-claims duplicate.pdf

2356-mas-1997-claims original.pdf

2356-mas-1997-correspondence others.pdf

2356-mas-1997-correspondence po.pdf

2356-mas-1997-description complete duplicate.pdf

2356-mas-1997-description complete original.pdf

2356-mas-1997-drawings.pdf

2356-mas-1997-form 1.pdf

2356-mas-1997-form 26.pdf

2356-mas-1997-form 3.pdf

2356-mas-1997-other documents.pdf


Patent Number 208326
Indian Patent Application Number 2356/MAS/1997
PG Journal Number 35/2007
Publication Date 31-Aug-2007
Grant Date 23-Jul-2007
Date of Filing 20-Oct-1997
Name of Patentee OWENS-BROCKWAY PLASTIC PRODUCTS INC.
Applicant Address ONE SEAGATE, TOLEADO, OH 43666
Inventors:
# Inventor's Name Inventor's Address
1 ROGER P. SMITH 820 BRIDGETON LANE, PERRYSBURG, OH 43551
2 JEFFERY S. LUGAR 1078 BRIDGEWATER LANE, FREMONT, OH 43420
3 THOMAS J. KRALL 4537 SHADWOOD LANE, TOLEDO, OH 43614,
4 MICHAEL D. NORTON 30457 LEMOYNE ROAD., WALBRIDGE, OH 43465
PCT International Classification Number B29B11/08
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 08/735, 580 1996-10-23 U.S.A.