EP0739268A1 - Process to manufacture articles in expanded reticular polymeric materials and the resulting products - Google Patents

Process to manufacture articles in expanded reticular polymeric materials and the resulting products

Info

Publication number
EP0739268A1
EP0739268A1 EP95936906A EP95936906A EP0739268A1 EP 0739268 A1 EP0739268 A1 EP 0739268A1 EP 95936906 A EP95936906 A EP 95936906A EP 95936906 A EP95936906 A EP 95936906A EP 0739268 A1 EP0739268 A1 EP 0739268A1
Authority
EP
European Patent Office
Prior art keywords
reticulation
polymeric materials
articles
manufecture
expanded
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.)
Withdrawn
Application number
EP95936906A
Other languages
German (de)
French (fr)
Inventor
Reynaldo Oscar Oliver Silva
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
Publication of EP0739268A1 publication Critical patent/EP0739268A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C67/0007—Manufacturing coloured articles not otherwise provided for, e.g. by colour change
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • B29C43/145—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multicoloured articles
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2031/00—Use of polyvinylesters or derivatives thereof as moulding material
    • B29K2031/04—Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B29K2105/243—Partially cured
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2031/48—Wearing apparel
    • B29L2031/50—Footwear, e.g. shoes or parts thereof
    • B29L2031/504—Soles

Definitions

  • This invention constitutes a process through which we can reach different hardness, densites and colors, with perfect control in its distribution in the final product.
  • each piece can have, one color, one density and one hardness all of them pre-determined.
  • the pre-molded pieces will be incased and placed in a way to form the group to be submitted to connected reticulation. It is also part of this invention the final product gotten with this process.
  • Figure 2 shows the inner sole ready and the pieces (1), (2), (3), (4) and (5) together through reticulation and the figure indicates that (1) is a color with 48 shore a hardness, (2) the second color with 25 shore a hardness and (3), (4) and (5) represent the third color with 45 shore a hardeness.
  • Figure 3 shows the pre-molded parts (6) , (7) , (8) and (9) of a sole of sandal and slipper where the following characteristics were demanded: 3 colors with unique density and hardness.
  • Figure 4 shows the sole when it is ready with the pieces (6), (7), (8) and (9) already together by reticulation permitting to observe that the joints of the pieces present a homogeneous texture, and total definition of colors, showing on the drawing by (6) the first color, (7) and (9) the second color and finally (8) the third color.
  • the process starts with the formation of the compound of polymeric material to be used in each one of the parts that will form the final product, and this compound will have its characteristics, color, density and hardness demanded in each part.
  • the compound of polymeric material also known as E.V.A.
  • E.V.A. in its color, density and hardness we seek, through the injection process, extrusion or any other way, to plastify the E.V.A. compound in such temperature that allows the pre ⁇ molding in closed mold.
  • the temperature in the pre ⁇ molding process cannot surpass the point in which the expander agent, and the reticulating agent start to react and that is between 95 and 105 Celsius degrees.
  • the mold to pre-form the pieces should be in a constant temperature of 45 Celsius degrees, and that also has air exits, in specific places, to avoid the compound to copy the mold details perfectly. Every time that the pre-molded pieces get out of the mold it is necessary to put immediately in a water deposit with temperature between 40 and 50 Celsius degrees for at least 3 minutes, after this time put in a continuous tunel to take out the humidity of the parts in a temperature of 30 Celsius degrees. Finisshed the first step with the pre-molded pieces ready to the next fase, it is necessary to process them in the maximum time of 24 hours in order to keep the compound to be reticulated in the second step, inaltered.
  • the second step of the process consists in setting the pre-molded pieces in only one group, and later put them in mold specially prepared to reticulate and expand through the compression in press of quick open process.
  • the mold where the parts are put for later reticulation and expansion, must be made with vacuous chamber, or make the vacuous chamber out of the mold, to get to take it out before its total closing, the air that occasionally gets in, reaching the desired finishing without fails on the final product surface.
  • the volume of the group must be equal to the cavity of the mold, where it shoul be reticulated in a temperature that varied from 150 to 180 Celsius degrees, and during the necessary time according to thickness and characteristics desired.
  • This process still allows, giving to the final product as many densities and hardnesses as the necessary pre-molds to form the final product, providing, if it is the demand, a sole, for example, with two different hardnesses and densites.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

Patent of invention of a process to manufacture articles in expanded reticular polymeric materials and the resulting product in which a premolding process of the polymeric material antecedes to a reticulation and expansion process providing the possibility of production of polymeric material in more than one color, density and hardness through the connected vulcanization of the premolded pieces.

Description

Descriptive report of patent of invention of a "PROCESS TO MANUFACTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCTS". It is a process through which we can get goods in a polymeric material in one or more colors, in one or in different hardnesses, as well as one or more densites, where the material passes along a pre-molding fase and another that is a reticulation fase, these fases are independent but provide the exact placement of the different colors, densites and hardnesses in the final product.
Nowadays in order to get pieces in polymeric material with different colors, hardness and density it is necessary to put together the parts when they are ready using a gluing process taking the risk of ungluing (separating) besides the production costs.
Another technique that is used referring to colors is painting. As soon as the piece is ready its external faces are painted according to what is desired. Although, in this case, it avoids ungluing, it does not avoid costs with the painting process and the inherent losses. Besides, according to the material, painting is not very proper to the visual effect. On the other hand, through the present techniques there is no way to inject E.V.A. compound to obtain different densites and hardness in the same object, as the operation of injection and reticulation happens sequentially at the same matrix.
It is also used a process of superposition of layers, it is blades of the compound for later connected reticulation. In this case the colors are always parallel and in superposed layers. At last, to get more than one color, there is the possibility of mixing the "pellets" of many colors. In this case, a product where the colors distribution happens aleatoryly, without possibility of control is gotten This invention constitutes a process through which we can reach different hardness, densites and colors, with perfect control in its distribution in the final product.
In the first step of the process we pre-mold the compound of polymeric material (E.V.A.) of each one of the pieces that form the final product. Each piece can have, one color, one density and one hardness all of them pre-determined.
In the second step the pre-molded pieces will be incased and placed in a way to form the group to be submitted to connected reticulation. It is also part of this invention the final product gotten with this process.
A better description of this invention is accomplished with support of the figures, where: Figure l shows the pre-molded pieces (1) ,
(2), (3), (4) and (5) to make an inner sole of a sports shoe.
Figure 2 shows the inner sole ready and the pieces (1), (2), (3), (4) and (5) together through reticulation and the figure indicates that (1) is a color with 48 shore a hardness, (2) the second color with 25 shore a hardness and (3), (4) and (5) represent the third color with 45 shore a hardeness.
Figure 3 shows the pre-molded parts (6) , (7) , (8) and (9) of a sole of sandal and slipper where the following characteristics were demanded: 3 colors with unique density and hardness.
Figure 4 shows the sole when it is ready with the pieces (6), (7), (8) and (9) already together by reticulation permitting to observe that the joints of the pieces present a homogeneous texture, and total definition of colors, showing on the drawing by (6) the first color, (7) and (9) the second color and finally (8) the third color. The process starts with the formation of the compound of polymeric material to be used in each one of the parts that will form the final product, and this compound will have its characteristics, color, density and hardness demanded in each part.
Once defined the compound of polymeric material, also known as E.V.A., in its color, density and hardness we seek, through the injection process, extrusion or any other way, to plastify the E.V.A. compound in such temperature that allows the pre¬ molding in closed mold. The temperature in the pre¬ molding process, cannot surpass the point in which the expander agent, and the reticulating agent start to react and that is between 95 and 105 Celsius degrees.
In this called first step of the process, where we pre-mold the E.V.A. compound it is necessary to observe some caution to, in a second fase, get constant results, because any difference in the pre¬ molding process will cause differences in the final product.
The mold to pre-form the pieces, should be in a constant temperature of 45 Celsius degrees, and that also has air exits, in specific places, to avoid the compound to copy the mold details perfectly. Every time that the pre-molded pieces get out of the mold it is necessary to put immediately in a water deposit with temperature between 40 and 50 Celsius degrees for at least 3 minutes, after this time put in a continuous tunel to take out the humidity of the parts in a temperature of 30 Celsius degrees. Finisshed the first step with the pre-molded pieces ready to the next fase, it is necessary to process them in the maximum time of 24 hours in order to keep the compound to be reticulated in the second step, inaltered. In the case of short of equipment to process all the pre-molded pieces, these must be placed in vacuous closed packing and kept in j a place without light and with a temperature of maximum 15 Celsius degrees. So we can keep inaltered the compound characteristics until 30 days after the initial process.
The second step of the process consists in setting the pre-molded pieces in only one group, and later put them in mold specially prepared to reticulate and expand through the compression in press of quick open process.
The mold where the parts are put for later reticulation and expansion, must be made with vacuous chamber, or make the vacuous chamber out of the mold, to get to take it out before its total closing, the air that occasionally gets in, reaching the desired finishing without fails on the final product surface.
The volume of the group must be equal to the cavity of the mold, where it shoul be reticulated in a temperature that varied from 150 to 180 Celsius degrees, and during the necessary time according to thickness and characteristics desired. Once gotten the final product, this is submitted, immediately, to a cooling process accomplished by a movable belt which puts the part coming from the matrix of reticulation in a channel where there are many water deposits in different temperatures. The cooling operation happens sequentially, starting with a temperature of 99°C, 77°C, 50°C and 30°C, in periods of approximately four minutes. After this process, the pieces pass through a tunel of forced ventilation, with air in a temperature around 25°C to get dry.
In this reticulation process we use all the ways already known, as the temperature control, as time control as well as the pressure of press closing. The reticulation has the function besides giving to the piece its final size, expanded, to provide the linking of many parts to get the final piece.
So, the reticulation puts together each of the parts with different colors, densites and hardnesses, that form the final product as we can see on figures 2 and 4.
We can notice on figure 2 that the color expanded reticulated polymeric material, is perfectly limited to the pre-defined areas accomplished by the pre-molds. By this process we can give to the final product a better appearance than to those that had the printing process and better resistance than those that had the gluing process.
This process still allows, giving to the final product as many densities and hardnesses as the necessary pre-molds to form the final product, providing, if it is the demand, a sole, for example, with two different hardnesses and densites.

Claims

Claims 1."PROCESS TO MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCT" characterized by two fases, the first one, the pre-molding of the polymeric material before the reticulation, and the second one, the reticulation.
2."PROCESS TO MANUFECTURE ARTICLES IN
EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCT" according to claim l, characterized by a first fase in which the polymeric material is submitted to pre-molding at a temperature lower to the one in which the expander and reticulation agents become active.
3."PROCESS TO MANUFECTURE ARTICLES IN
EXPANDED RETICULAR POLYMERIC MATERIALS AND THE
RESULTING PRODUCT" according to claim 2, characterized by the separated molding of each of the pre-molds of the final group that have diferent colors, densities and hardness.
4."PROCESS TO MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCT" according to claim 1, characterized by the connected reticulation of the pre-molds.
5. "PROCESS TO MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCT" according to claim 4, characterized by the connected reticulation of the pre-molds of different colors, densities or hardnesses that form the final group.
6."PROCESS TO MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS AND THE RESULTING PRODUCT" according to claim 5, characterized by mold where the pieces are put for later reticulation and expansion, not having air inside at the moment of reticulation.
7."PRODUCT OBTAINED THROUGH A PROCESS TO MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC MATERIALS" characterized by a first fase of the pre¬ molding and a second fase of reticulation.
8."PRODUCT OBTAINED THROUGH A PROCESS TO
MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC
MATERIALS" according to claim 6, characterized by having, at least two pieces linked by the reticulation process.
9."PRODUCT OBTAINED THROUGH A PROCESS TO
MANUFECTURE ARTICLES IN EXPANDED RETICULAR POLYMERIC
MATERIALS" characterized by having at least two colors, densities and or hardnesses resulting from different polymeric matirial compond used in the pre-mold.
EP95936906A 1994-11-10 1995-11-10 Process to manufacture articles in expanded reticular polymeric materials and the resulting products Withdrawn EP0739268A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BR9404462A BR9404462A (en) 1994-11-10 1994-11-10 Process for the production of articles in expanded cross-linked polymeric materials and the product thus obtained
BR9404462 1994-11-10
PCT/BR1995/000053 WO1996014978A1 (en) 1994-11-10 1995-11-10 Process to manufacture articles in expanded reticular polymeric materials and the resulting products

Publications (1)

Publication Number Publication Date
EP0739268A1 true EP0739268A1 (en) 1996-10-30

Family

ID=4059962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936906A Withdrawn EP0739268A1 (en) 1994-11-10 1995-11-10 Process to manufacture articles in expanded reticular polymeric materials and the resulting products

Country Status (5)

Country Link
EP (1) EP0739268A1 (en)
CN (1) CN1141610A (en)
AR (1) AR000110A1 (en)
BR (1) BR9404462A (en)
WO (1) WO1996014978A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1393876A1 (en) * 2002-08-26 2004-03-03 Alcan Technology & Management Ltd. Method of making foam article from thermoplastic material
US9282785B2 (en) * 2013-03-15 2016-03-15 New Balance Athletic Shoe, Inc. Multi-density sole elements, and systems and methods for manufacturing same
US10226906B2 (en) * 2014-04-14 2019-03-12 Nike, Inc. Method of manufacturing sole assembly formed of multiple preforms

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072461A (en) * 1975-09-11 1978-02-07 Metzeler Kautschuk Ag Apparatus for the production of laminated bodies particularly, multilayered shoe soles
JPS5725925A (en) * 1980-07-22 1982-02-10 Toyo Rubber Chem Ind Co Ltd Manufacture of low density synthetic resin foamed body
EP0219593A3 (en) * 1985-09-16 1988-07-27 Manufactura Espanola Del Caucho, S.A. A process for the production of soles for shoes
FR2633810B1 (en) * 1988-07-11 1990-09-28 Patrick International PROCESS AND MOLD FOR MANUFACTURING BY VULCANIZATION A SHOE OUTSOLE IN AT LEAST TWO SUBSTANTIALLY HORIZONTAL LAYERS OF DIFFERENT COLORS TO THE SOLE SO OBTAINED
JP2933642B2 (en) * 1989-08-10 1999-08-16 三井化学株式会社 Manufacturing method of laminated molded body
DE4022778A1 (en) * 1990-07-18 1992-01-23 Kloeckner Ferromatik Desma Rubber sole injection moulding - uses distributor between moulds at temp. preventing premature vulcanisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9614978A1 *

Also Published As

Publication number Publication date
AR000110A1 (en) 1997-05-21
WO1996014978A1 (en) 1996-05-23
CN1141610A (en) 1997-01-29
BR9404462A (en) 1997-03-04

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