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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
• • 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
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/3005—Body finishings
  • B29L2031/3014—Door linings

Definitions

• the present invention refers to a method for manufacturing a multi-material product, preferably a thermoplastic product by injection into a mould, the mould used in this manufacturing method, and the products obtained.
• One object of the present invention is to provide a solution for manufacturing plastic parts presenting different colors and/or materials.
• One object of the present invention is to provide a solution for manufacturing plastic parts presenting different colors and/or materials.
• the injection mould is a tool built for the purpose of molding plastic parts.
• one tongue or fixed half of the mould containing the injection system (at least one nozzle) and may have ejectors or lifters;
• the moulds have different sizes, shapes, geometries and mechanisms design, according to the part or parts meant to be produced.
• the mould is usually assembled in an injection machine, which injects the plastic into the mould; the plastic parts obtained from the injection are either directly sent to the end consumer, for instance, as plastic cups, containers or storage boxes, or are used in another type of industry that mixes multiple parts in order to obtain a final product.
• An example is the automobile industry, aeronautics and naval applications which increasingly use plastic materials for vehicle construction.
• the present invention describes a method for manufacturing a multi-material product by injection into a mould, the injected materials, the mould itself being able to perform the present methodology and the obtained plastic parts.
• the objects of the present invention allow obtaining plastic parts in multiple materials, through two sequential injections steps in a single mould, mainly benefiting from the capacity of the injection machine so as to proceed with an intermediate stop, block and inject, using the plastic itself to seal the joining areas between zones with different colors.
• multi- material includes the same material with different colors and / or matters of different nature which are compatible in terms of adhesion.
• One achievement of the present invention is to disclose a method for manufacturing a multi-material product by injection into a mould comprising the following steps:
• first materials (3,5) into a closed mould (1) into one or several first cavities; partially opening the mould, subsequent to first material (3,5) solidification, a simultaneous extraction occurring up to a preset value;
• a further preferred embodiment comprises a method for manufacturing a multi-material product by injection into a mould wherein the mould opening can be equal to the thickness of the second material (9) in the final part, with a tolerance range from half up to two times of said thickness. More preferably the opening of the mould may vary from 0.5 up to 15 mm; more preferably the opening may vary from 1 to 7 mm; still more preferably the opening may vary from 1.5 to 4 mm; and even more preferably the opening of the mould may be of 2 mm the tolerances being as those usual in this technical field.
• the method for manufacturing a multi-material product by injection into a mould as hereinabove described may inject materials of different colors.
• the materials to be injected can be thermoplastic materials, such as polyamide, polycarbonate, Polyester, polyethylene, polypropylene, polyacrylonitrile, polystyrene, polyvinyl chloride, polyurethane, among others .
• Another preferred goal is a mould for manufacturing a multi-material product, preferably of different colors, by injection techniques comprising: a. one or more first cavities to inject one or more first materials into the closed mould;
• one or more second cavities to inject one or more second materials the cavities allowing the second materials to bind to the first materials, being sealed by the elements obtained by the injection of the first materials and by the sealing of the tongue half of the mould, preferably laterally, wherein in a more preferred embodiment the seal may additionally be performed by lifters and / or ejectors, existing in the tongue half of the mould.
• the mould used to manufacture a multi-material product by injection as previously described may consist of a metal alloy, preferably aluminum or steel. Still in a more preferred embodiment it may include surface treatments.
• Figure 1 Depicts the first step of the injection with the mould closed:
• (1) represents the mould closed
• (2) represents the injection nozzle which injects the first plastic material with color A
• (4) represents the injection nozzle which injects the first plastic material with color B (5)
• Figure 2 - Represents the second step of the injection, after solidification of the first plastic materials (3 and 5), wherein the mould opens simultaneously occurring the ejection (7), the plastic part remaining leaning on the cavity of the mould (6).
• the injection nozzle (8) injects the second materials or binding materials (9 ), binding materials of color A to those of B.
• the arrows represent the demolding direction.
• Figure 3 Represents the ejection of the plastic part.
• the mould opens completely and the multi-material plastic part (10) is ready for demolding.
• Figure 4 Represents a detail of Figure 2, after solidification of the first plastic materials (3 and 5), second materials or binding materials (9), binding materials of colors A e B.
• Figure 5 Represents the ejection kinematics of a plastic part .
• One objective of the present invention is to provide a method for manufacturing a multi-material product by injection into a mould wherein:
• the mould slightly opens and the ejection occurs simultaneously to the opening.
• the second material or binding material is injected, thus connecting the areas of different color or materials.
• This innovation is applicable to all kinds of multi- material parts and is especially advantageous for manufacturing plastic parts of medium and large size such as: door panels, dashboards, instrument panels, among others. These can be used in automotive, naval or aeronautic applications.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=43499488

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (4)

• 2009
  • 2009-07-22 PT PT10468509A patent/PT104685A/pt not_active IP Right Cessation
• 2010
  • 2010-07-22 EP EP10747285A patent/EP2456605A2/de not_active Withdrawn
  • 2010-07-22 WO PCT/IB2010/053346 patent/WO2011010295A2/en active Application Filing

Non-Patent Citations (1)

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