Microcellular Injection Molding Method

An injection molding, microporous technology, used in the production of bulk chemicals, other household appliances, tampons, etc., can solve the problems of cumbersome operation, time-consuming, high cost, high molding effect, improved solubility, and low mechanical properties Effect

Inactive Publication Date: 2016-07-06
EVEREADY BATTERY CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these measures are often costly, time-consuming, and / or require complex redesign of the mold, or are cumbersome to operate

Method used

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  • Microcellular Injection Molding Method
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  • Microcellular Injection Molding Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 - Polymer Formulation

[0068] Mix LDPE (LowDensityPolyethylene) low-density polyethylene resin (such as Chevron-Phillips Chemical Company LLC Chevron Phillips Chemical Co., Ltd., MARLEX KN226 produced by The Woodlands, Texas, USA) with the green LDPE masterbatch formula, To generate the mixture shown below, hereinafter referred to as "LDPE resin mixture":

[0069] LDPE: 98.493%

[0070] Mica mica: 0.606%

[0071] TiO 2 Titanium dioxide: 0.516%

[0072] Erucamide: 0.25%

[0073] Ethylenebis-stearamideEBS ethylenebisstearamide: 0.125%

[0074] Colorant: <0.01%

[0075] (Wherein, the LDPE of last five kinds of compositions and a small portion forms the green concentrate described below. In the present invention, the addition of colored concentrate is optional, therefore, also can not add this green concentrate in the above-mentioned formula .

[0076]In addition, the following another polymer formulation was prepared by adding 1% by weight of oleamide ...

Embodiment 2

[0091] Example 2—Plastic product molding experiment

[0092] By using the following experimental equipment, the above-mentioned LDPE resin mixture was prepared as a sample by injection molding experiment.

[0093] Injection molding machine: Arburg320SAllrounder55ton (from Arburg Company, Arburg, Inc., Newington, Connecticut, USA)

[0094] ·Supercritical fluid equipment (from Trexel, Trexel, Inc., Woburn Massachusetts, USA)

[0095] ·Supercritical Fluid: Nitrogen

[0096] In this example, the following two experiments were carried out: 1) tensile bar experiment; 2) the use of a small size mold to prepare a tampon (comparable to a commercially available large "super" size tampon) applicator sleeve test. Table 1 below lists the conditions for the tensile bar forming experiment.

[0097] Table 1: Experimental Conditions for Tensile Bar Forming

[0098] describe

Solid tensile test rod

Forming Machine

Arburg320S

Material

LDPE (KN226) and ...

Embodiment 3

[0112] Example 3 - Tampon Applicator Experiment

[0113] The tampon applicator sleeve is molded using a fairly complex four-hole, hot-runner mold. The mold is mechanically installed and electrically connected to the Arburg 320S forming machine and figure 2 Device 10 is shown. Injection molding is performed using a round radial nozzle. The hot runner columns were zoned electrically heated using a temperature control unit (from Gammaflux L.P., Sterling, VA). The mold is cooled using a cold water system with an inlet temperature of 10 or 22°C. Unless otherwise specified below, other parameters and operating conditions of this embodiment are the same as those of Embodiment 2 above.

[0114] Other parameters of the tampon applicator sleeve molding were as follows:

[0115] ●Core-pulling function for expansion before mold opening and retraction before mold closing

[0116] ●Pneumatic ejection function of generated products

[0117] ●Material: LDPE resin mixture

[0118] ●...

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Abstract

In a microcellular injection molding process, a polymer and a supercritical fluid are processed. One condition for processing the polymer and / or the supercritical fluid is by controlling the weight of a plastic part and / or the surface properties of the resulting part. In another method of microcellular injection molding to produce plastic parts, the polymer is heated and melted and a supercritical fluid is added to it. The resulting mixture is a single phase polymer-gas solution containing the polymer and supercritical fluid. The polymer and the critical fluid are tuned to control the weight of the plastic part and / or the surface properties of the plastic part. Once conditioned, the molten polymer containing supercritical fluid is injected into the mold. After injecting the molten polymer and supercritical fluid, a pressure drop causes the supercritical fluid to nucleate in the molten polymer, thus causing bubble nucleation.

Description

technical field [0001] The present invention relates to the field of injection molding, and in particular to the technical field of using microcellular injection molding process in the manufacture of personal and consumer care products and their packaging. Background technique [0002] Many personal and consumer products and packaging are made of plastic materials, and most plastics are thermoplastics that melt from a solid state to a flowable liquid state when heated and resolidify when cooled. Furthermore, the melting and solidification process can be repeated. In addition, certain plastics are thermosets, meaning they react or cross-link under heat or pressure to form a solid. Here, the so-called "crosslinking" means that an element, group or compound connects carbon atoms on two different polymer molecular chains through chemical bonds, thereby bridging the two polymer molecular chains together and forming a A crosslinked network of polymer molecules. [0003] There a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B29C44/34A61F13/20A61F13/26C08J9/12
CPCA61F13/2097B29C44/348B29L2031/753C08J9/122C08J2203/06C08J2203/08Y02P20/54
Inventor尤金·P·小多尔蒂基思·埃奇特立生·同克里斯·拉西李贞珠帕特里克·J·戈顿孙晓飞
OwnerEVEREADY BATTERY CO INC