GB1589255A - Method of preparing a polypropylene endliess loop and the product obtained thereby - Google Patents

Method of preparing a polypropylene endliess loop and the product obtained thereby Download PDF

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Publication number
GB1589255A
GB1589255A GB14537/78A GB1453778A GB1589255A GB 1589255 A GB1589255 A GB 1589255A GB 14537/78 A GB14537/78 A GB 14537/78A GB 1453778 A GB1453778 A GB 1453778A GB 1589255 A GB1589255 A GB 1589255A
Authority
GB
United Kingdom
Prior art keywords
polypropylene
sheet
endless
endless loop
transverse length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB14537/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB14537/78A priority Critical patent/GB1589255A/en
Priority to IT20534/79A priority patent/IT1113416B/en
Publication of GB1589255A publication Critical patent/GB1589255A/en
Priority to HK537/81A priority patent/HK53781A/en
Priority to MY160/82A priority patent/MY8200160A/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/16—Auxiliary apparatus
    • D07B7/165—Auxiliary apparatus for making slings
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

(54) METHOD OF PREPARING A POLYPROPYLENE ENDLESS LOOP AND THE PRODUCT OBTAINED THEREBY (71) 1, SPENCER BING-TANG LIN. of No.12-3. Lane 2, Suei-Duei-Tze. Tamsui, Taipei, Taiwan, a citizen of Taiwan. do hereby declare the invention for which I pray that a patent may be granted to me. and the method by which it is to be performed. to be particularly described in and by the following statement:- This invention relates to a method of preparing a polypropylene endless loop and to the product obtained thereby.
Polypropylene ropes. cords, strands and the like have been widely used for packaging purposes, but there has been no previous disclosure or use of polypropylene endless loops.
The present invention in one aspect provides a method of preparing a polypropylene endless loop comprising blow-moulding polypropylene raw material into a tubular sheet, transversely drawing the said sheet with a draw ratio of at least 4. cutting or slitting the said sheet transverse to the axis of the original tubular sheet. before or after the said drawing step, to form a plurality of individual endless sheets. and twisting a said sheet after drawing and cutting or slitting to form an endless loop.
The invention in another aspect provides a polypropylene endless loop prepared by the method according to the invention and having a transverse length of the drawn endless sheet of from 7.5 to 35cm with a tensile load at break of the endless loop of at least 6 kgs.
The blow-moulding of the polypropylene is carried out by a known technique with a conventional blow-moulding machine. but the moulded polypropylene tubular sheet, for providing the desired finished loop, should preferably have dimensions of 15 to 50mm, more preferably 2() to 30mm. in transverse length, and 0.()3 to 0.1mum, preferably ().05 to 0.()6 mm, in thickness The term "transverse length" used herein as defined as the length measured transversely. i.e. along the radial direction of the tubular sheet, at one side of the drawn endless sheet. The term "endless sheet" used herein as defined as the tubular sheet folded to become a flat sheet material having two superimposed layers in close contact with each other.
When the cutting step is carried out before the drawing step, the tubular sheet is preferably cut at a longitudinal distance of from 1() to 6() mm. more preferably 25 to 35 mm, to form individual endless sheets. Accordingly, this distance becomes the width of the resulting endless sheet, and upon transverse drawing this width will be slightly decreased.
Upon transverse drawing. a force is applied to the endless sheet along the transverse direction which is perpendicular to the longitudinal direction with respect to the original tubular sheet, with a draw ratio at least 4, and preferably from 5 to 7. The term "draw ratio" used herein denotes the ratio of the transverse length of the sheet after drawing to the same before drawing. When the draw ratio is less than 4, the resulting endless loop has an insufficient tensile strength. while too great a draw ratio results in the sheet being broken due to drawing beyond its limit.
After drawing. the transverse length of the endless sheet will preferably be from 7.5 to 35 cm, preferably from 1() to 2() cm.
The transverse drawing may be carried out at ambient temperature or at elevated temperature which is preferably up to 4U0C.
The drawn endless sheet so obtained is further twisted in any convenient manner to become the desired endless loop.
In general. a polypropylene endless loop for packaging should bear a weight of about 1 to 5 kilograms, and the tests carried out in the following examples show that the tensile load at break of the endless loop is greater than 8 kgs.
The invention will therefore be further described with reference to the following illustrative Examples.
Example I A blow-moulded polypropylene tubular sheet 25 mm in transverse length and 0.055 mm in thickness was cut into endless sheets at a longitudinal distance of 35 mm. After drawing to a suitable extent. the transverse length was measured as shown in Table 1. The width of the individual endless sheet after drawing was in the range of 25 to 26 mm. Finally. the endless sheet was twisted to form an endless loop and subjected to tensile testing. the tensile load obtained being given in Table 1.
TABLE 1 Transverse length Draw ratio bv Tensile Load Run No. after drawing. mm calculation at break. kgs.
17() 6.80 12 2 15() 6.00 10 3 158 6.32 10 4 161 6.44 14 152 6.08 14 6 144 5.76 14 7 154 6.16 15 8 158 6.32 14 9 157 6.28 14 1() 156 6.24 13 Example 2 The procedure of Example I was repeated. except that the endless sheet was cut at a longitudinal distance of 3() mm.- The results are shown in Table 2.
TABLE 7 Transverse length Draw Ratio by Tensile load Run No. after drawing. mm. calculation at break. kgs.
I 1 172 6.88 13 12 15 6.36 13 13 165 6.60 1() 14 166 6.64 11 15 154 6.16 13 16 155 6.2() 1() 17 157 6.28 14 18 157 6.28 12 19 16() 6.4() 12 2() 15() 6.()0 13 Example 3 The procedure of Example 1 was repeated. except that the endless sheet was cut at a longitudinal distance of 25 mm. The results are shown in Table 3.
TABLE 3 Transverse length Draw ratio by Tensile load Run No. after drawing. mm. calculation at break. kgs.
21 150 6.00 10 22 151 6.04 8 23 151 6.04 8 24 151 6.04 11 25 150 6.00 9 26 152 6.08 11 27 150 6.00 10 28 150 6.00 10 29 154 6.16 9 30 151 6.04 9 It is apparent from Table 3 that when a sheet with a thickness of 0.055 mm is cut at a longitudinal distance of 25 mm, i.e. to obtain individual endless sheets with a width of 25 mm, then the tensile strength after drawing is less satisfactory. Therefore. it is preferable to employ thicker polypropylene tubular sheet or a wider endless sheet to give a more satisfactorv tensile load.
WHAT I CLAIM IS: 1. A method of preparing a polypropylene endless loop comprising blow-moulding polypropylene raw material into a tubular sheet. transversely drawing the said sheet with a draw ratio of at least 4. cutting or slitting the said sheet transverse to the axis of the original tubular sheet. before or after the said drawing step. to form a plurality of individual endless sheets, and twisting a said sheet after drawing and cutting or slitting to form an endless loop.
2. A method as claimed in Claim 1. wherein the transverse drawing is carried out at a temperature of from ambient temperature up to 40"C.
3. A method as claimed in Claim 1 or 2, wherein the draw ratio is from 5 to 7.
4. A method according to Claim I preparing a polypropylene endless loop substantially as herein described in any of the foregoing Examples.
5. A polypropylene endless loop prepared by the method as claimed in any of Claims I to 4.
6. A polypropylene endless loop prepared by the method as claimed in Claim 1 and having a transverse length of the drawn endless sheet of from 7.5 to 35cm with a tensile load at break of the endless loop of at least 6kgs.
7. A polypropylene endless loop as claimed in Claim 6, obtained by cutting a polypropylene tubular sheet ().03 to (). 1 mm in thickness and 15 to 5() mm in transverse length at a longitudinal distance of from 1() to 6() mm. transversely drawing the same at a draw ratio of at least 4 to a resulting transverse length of 7.5 to 35cm. followed by twisting.
8. A polypropylene endless loop as claimed in Claim 6, obtained by transversely drawing a polypropylene tubular sheet ().()3 to O. 1 mm in thickness and 15 to 50mm in transverse length at a draw ratio of at least 4 to a resulting transverse length of 7.5 to 35cm, cutting the same at a longitudinal distance of from 10 to 60mm, followed by twisting.
9. A polypropylene endless loop according to Claim 6. substantially as herein described in any of the foregoing Examples.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    Example 3 The procedure of Example 1 was repeated. except that the endless sheet was cut at a longitudinal distance of 25 mm. The results are shown in Table 3.
    TABLE 3 Transverse length Draw ratio by Tensile load Run No. after drawing. mm. calculation at break. kgs.
    21 150 6.00 10
    22 151 6.04 8
    23 151 6.04 8
    24 151 6.04 11
    25 150 6.00 9
    26 152 6.08 11
    27 150 6.00 10
    28 150 6.00 10
    29 154 6.16 9 30 151 6.04 9 It is apparent from Table 3 that when a sheet with a thickness of 0.055 mm is cut at a longitudinal distance of 25 mm, i.e. to obtain individual endless sheets with a width of 25 mm, then the tensile strength after drawing is less satisfactory. Therefore. it is preferable to employ thicker polypropylene tubular sheet or a wider endless sheet to give a more satisfactorv tensile load.
    WHAT I CLAIM IS: 1. A method of preparing a polypropylene endless loop comprising blow-moulding polypropylene raw material into a tubular sheet. transversely drawing the said sheet with a draw ratio of at least 4. cutting or slitting the said sheet transverse to the axis of the original tubular sheet. before or after the said drawing step. to form a plurality of individual endless sheets, and twisting a said sheet after drawing and cutting or slitting to form an endless loop.
  2. 2. A method as claimed in Claim 1. wherein the transverse drawing is carried out at a temperature of from ambient temperature up to 40"C.
  3. 3. A method as claimed in Claim 1 or 2, wherein the draw ratio is from 5 to 7.
  4. 4. A method according to Claim I preparing a polypropylene endless loop substantially as herein described in any of the foregoing Examples.
  5. 5. A polypropylene endless loop prepared by the method as claimed in any of Claims I to 4.
  6. 6. A polypropylene endless loop prepared by the method as claimed in Claim 1 and having a transverse length of the drawn endless sheet of from 7.5 to 35cm with a tensile load at break of the endless loop of at least 6kgs.
  7. 7. A polypropylene endless loop as claimed in Claim 6, obtained by cutting a polypropylene tubular sheet ().03 to (). 1 mm in thickness and 15 to 5() mm in transverse length at a longitudinal distance of from 1() to 6() mm. transversely drawing the same at a draw ratio of at least 4 to a resulting transverse length of 7.5 to 35cm. followed by twisting.
  8. 8. A polypropylene endless loop as claimed in Claim 6, obtained by transversely drawing a polypropylene tubular sheet ().()3 to O. 1 mm in thickness and 15 to 50mm in transverse length at a draw ratio of at least 4 to a resulting transverse length of 7.5 to 35cm, cutting the same at a longitudinal distance of from 10 to 60mm, followed by twisting.
  9. 9. A polypropylene endless loop according to Claim 6. substantially as herein described in any of the foregoing Examples.
GB14537/78A 1978-04-13 1978-04-13 Method of preparing a polypropylene endliess loop and the product obtained thereby Expired GB1589255A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB14537/78A GB1589255A (en) 1978-04-13 1978-04-13 Method of preparing a polypropylene endliess loop and the product obtained thereby
IT20534/79A IT1113416B (en) 1978-04-13 1979-02-26 RING WITHOUT END PLIPROPOLENIC AND PROCEDURE FOR MANUFACTURING IT
HK537/81A HK53781A (en) 1978-04-13 1981-11-05 Method of preparing a polypropylene endless loop and the product obtained thereby
MY160/82A MY8200160A (en) 1978-04-13 1982-12-30 Method of preparing a polypropylene endless loop and the product obtained thereby

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14537/78A GB1589255A (en) 1978-04-13 1978-04-13 Method of preparing a polypropylene endliess loop and the product obtained thereby

Publications (1)

Publication Number Publication Date
GB1589255A true GB1589255A (en) 1981-05-07

Family

ID=10042996

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14537/78A Expired GB1589255A (en) 1978-04-13 1978-04-13 Method of preparing a polypropylene endliess loop and the product obtained thereby

Country Status (4)

Country Link
GB (1) GB1589255A (en)
HK (1) HK53781A (en)
IT (1) IT1113416B (en)
MY (1) MY8200160A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247952A1 (en) * 1986-05-27 1987-12-02 Patrick Gennesson Process for making a plastic film, in particular for temporarily joining several articles
DE4406163C2 (en) * 1994-02-25 2003-07-24 Sanstrap Verpackungen Gmbh Device for securing goods and / or packaging containers on transport pallets or the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247952A1 (en) * 1986-05-27 1987-12-02 Patrick Gennesson Process for making a plastic film, in particular for temporarily joining several articles
WO1987007206A1 (en) * 1986-05-27 1987-12-03 Patrick Gennesson Method for fabricating a plastic film particularly for holding together temporarily a plurality of products, and film obtained by said method
FR2599295A1 (en) * 1986-05-27 1987-12-04 Gennesson Patrick PROCESS FOR PRODUCING A PLASTIC FILM, IN PARTICULAR THE TEMPORARY SOLIDARIZATION OF SEVERAL PRODUCTS AND THE FILM OBTAINED BY THE PROCESS
AU608516B2 (en) * 1986-05-27 1991-04-11 Patrick Gennesson Method for fabricating a plastic film particularly for holding together temporarily a plurality of products, and film obtained by said method
DE4406163C2 (en) * 1994-02-25 2003-07-24 Sanstrap Verpackungen Gmbh Device for securing goods and / or packaging containers on transport pallets or the like

Also Published As

Publication number Publication date
IT7920534A0 (en) 1979-02-26
MY8200160A (en) 1982-12-31
IT1113416B (en) 1986-01-20
HK53781A (en) 1981-11-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee