Technology Introduction

Plastic Molding

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We provide beautiful, seamless products with rapid heat cycle molding (RHCM).
Molded products manufactured with Rapid Heat Cycle Molding technology Control screen The FANUC ROBOSHOT high-speed injection molding machine (servo system/electronic injection molding machine)

Achieves seamless, advance-design molded products of superior strength

Do you have trouble with the following items?
  • Trouble with seams on transparent products
  • Trouble with product strength due to seams
  • Wanting to get rid of glass filler on the design surface, etc.
FUJIGOUSEI RHCM Resolves All of Your Issues. “Rapid Heat Cycle Molding (RHCM)” is a technology that improves the surface characteristics and quality of molded products by increasing and decreasing mold temperature in a short amount of time. With this molding method, it is possible to achieve the following.
  • Eliminates seams
  • Improves the transfer of bumpy textures
  • Improves glossiness
  • Does not expose glass fiber and filler on the surface of molded products
  • Greatly improves flow
  • Improves the surface hardness and crystallization of crystalline resins
  • Reduces residual strain

Because paint-less molding is possible, it has a positive effect on the environment

By eliminating seams and improving the degree of completion for design surfaces, it is possible to achieve paint-less molding even with products that conventionally required painting. Painted plastic cannot be recycled because it is not possible to easily separate the plastic from the oil-based paint, but paint-less plastic can be recycled and it is said that this method will become the dominant molding technique in the future.

The Principles of Rapid Heat Cycle Molding (RHCM)

The Principles of Rapid Heat Cycle Molding (RHCM)
  • Before the injection molding process, the surface temperature of the mold is raised to a temperature nearing the temperature of thermal deformation for the plastic that will be injected.
  • Between the injection of the plastic and the dwelling process, the mold temperature is maintained at or above the thermal deformation temperature.
  • After the dwelling process ends, the mold temperature is lowered in a short amount of time.
  • The plastic is then cooled and the molded product is ejected.
  • The mold temperature is rapidly lowered before the next shot
    (back to process 1)
We support new “hybrid molding” technology and respond to demands for advanced technology.

Hybrid molding is expected to be in demand from now on, making it possible to produce lighter and thinner molds

We expect to provide support for “Hybrid Molding”, which is predicted to see increased demand from now on, by introducing the latest, high-performance injection molding machines at FUJIGOUSEI. We will answer the needs of our customers for advancement based on our wealth of experience and the latest technology.

Insert molding x In-mold Molding → Hybrid molding

In the past, we manufactured coils and bobbins for communication transmission components as well as internal components for terminal boards with insert molding. This technology is applied in order to mold plastic inside the mold while simultaneously executing an in-mold molding method that adheres the plastic with sheet metal. Conventionally, it was only possible to conduct thick molding using plastic only due to strength and machine-related issues, but with this process, it has become possible to achieve lighter and thinner products.

Overview of Hybrid Molded Products
  • Molding material: Reny (GF45%)
  • Sheet metal: SUS304-CSP Ht=0.3
  • Mirror deposition decoration (outer design)
  • Outer dimensions: 90 mm x 49 mm x 4 mm
  • Wall thickness of molded product: 0.7 mm (standard wall thickness)
Hybrid Molded Product Prototypes created with hybrid molding

Prototype Examples (Prototypes created with the cooperation of our metal factory)

  • Sheet metal
  • Hybrid Molded Product (cabinet view)
  • Hybrid Molded Product (core view)
  • Hybrid molded product (expanded view of joints)

Prototype Evaluation

Sheet metal
Total
length
(mm)
Total
width
(mm)
Weight
(g)
Curvature
(mm)
Material
81.60 44.40 10.14 0.05 SUS
Case
Total
length
(mm)
Total
width
(mm)
Weight
(g)
Material
98.50 46.90 4.43 Reny GF45

*Sheet metal accuracy (Possible production with the following tolerance)
Total length, total width ±0.02 / Hole pitch ±0.05 / Curvature ±0.1

The Flow Analysis CAE System that Achieves Hybridization

This system achieves mold designs that have incorporated the best molding capabilities for in-mold molding as well as hybridization, based on the results of flow analysis, including fill time, confidence of fill, areas in which weld lines have occurred, and quality prediction.
Also, by determining the amount of deflection in the sheet metal, based on deflection occurrence shape predictions (the sheet metal is curved beforehand to reduce the amount of deflection after molding), it is possible to reduce the number of times that samples are made and shorten lead time until a light product is created.

  • Fill Time
  • Confidence of Fill
  • Quality Prediction
  • Weld Lines
  • Air Traps
  • Deflected Shape
If it relates to plastic, including questions, requests for an estimate, sample production, or development, leave it to us. Contact

With our integrated production system, we can accommodate your quality, cost, and delivery demands.

Through a partnership between three FUJIGOUSEI Inc. factories and three group companies, we make our customer’s plan a reality using our wealth of experiences and proven record.

  • An integrated system that handles everything from plastic mold design and production to molding, painting, and assembly
  • We provide high quality, low costs, and quick turnaround