ＤＪＫ List of Products and Services

• This is a test to determine the tear strength of plastic films and sheets. • Tear strength is expressed in Newton units. • A test specimen with a predetermined slit is torn by releasing a fan-shaped pendulum. • If the samples have equal thickness, comparison is possible.

• Other polymer materials

It is a shear test in the direction perpendicular to the laminated surface of GFRP using a Johnson-type two-surface jig.

• Strength Testing Equipment

The test method is a three-point bending test with an extremely short distance between the supports, which reduces the bending component (tensile stress on the underside of the specimen). The purpose of this test is to evaluate the adhesive performance between layers.

• Strength Testing Equipment

This test determines the shear strength based on the maximum load when punching with a punch (φ25.37mm) that has a slight clearance against the inner diameter (φ25.40mm).

• Strength Testing Equipment

• The tensile test is the most fundamental test for evaluating the mechanical properties of materials. • Our company is capable of conducting tests in a constant temperature chamber (-65 to 300°C). Temperature-dependent data for materials can be obtained. • We can handle the preparation of test specimens (injection molding, compression molding, extrusion, casting).

• Strength Testing Equipment

This is a test to measure the physical properties of molten polymer materials as they flow through a capillary, including shear rate, viscosity, and shear stress. Generally, when polymers are measured at a constant temperature, the viscosity decreases as the shear rate increases. Therefore, it is necessary to specify the shear rate when comparing viscosities. Additionally, this testing machine can also measure die swell (Barus effect) and melt strength.

• Other polymer materials

Melt Mass Flow Rate (MFR) and Melt Volume Rate (MVR) are both numerical values that represent the flowability of thermoplastic resins during melting. The amount of resin extruded from a die with a specified diameter, located at the bottom of a cylinder, is measured under constant temperature and load conditions over a period of 10 minutes. The values are expressed in units of g/10min (MFR) and cm3/10min (MVR), respectively. There are two testing methods: Method A, which involves manually cutting the extrudate, and Method B, which automatically measures time (or distance). Method A is applicable to materials with an MFR of 0.1 to 25 (g/10min), while Method B is applicable to materials with an MFR of 0.1 to 50 (g/10min). Additionally, MI (Melt Index) is synonymous with MFR and was used in the polyolefin industry.

• Other polymer materials

We will produce flat plates using a flat pressing mold (formwork).

• Other polymer materials

We will conduct film formation experiments of various thermoplastic resins using the T-die method (die width 150–300mm). Witness testing is also possible. Additionally, we will produce evaluation samples (approximately several to several tens of meters).

• Other polymer materials

We produce test specimens for various thermoplastic resins, ranging from general-purpose polymers to high-performance engineering plastics, for various physical property measurements (witness testing available). We have the latest hybrid molding machines (140t, 60t).

• Other polymer materials

The laboplastomill examines the behavior during mixing by measuring the torque and resin temperature during the kneading process. A lump-like kneaded product is obtained, and tests can be conducted with approximately tens of grams of material.

• Other polymer materials

The Plasthograph developed by Brabender (Germany) allows for the evaluation of the effects of a sample's chemical composition, physical structure, temperature, and shear changes on polymer viscosity by measuring the melt viscosity and temperature, as well as shear rate stability, under dynamic conditions relevant to actual production processing. The mixer (55cc) is standard for thermoplastic resin types and can accommodate rubber, elastomers, and thermosetting resins by exchanging the cam blade. Additionally, the latest model of the Plasthograph has upgraded the mixer capacity (supporting three levels of capacity).

• Other polymer materials

Single-screw extruders have a simple structure and generate high extrusion pressure on their own, making them useful not only for molding processes but also for the granulation of powder resins and flake resins, as well as for the production of compounds that mix small amounts of fillers and additives for coloring plastics.

• Other polymer materials

This is a kneading test service using a φ25 small-sized co-rotating twin-screw extruder. It allows for kneading tests on a small scale of about 1 kg, so valuable materials are not wasted. Of course, even though it is small, it is fully equipped, allowing for the flexible setting of kneading conditions (screw element design) characteristic of co-rotating twin screws, as well as multi-stage settings for venting and split feeding. Based on the test results obtained, it is also possible to scale up to larger machines. Additionally, leveraging our past experience, we can propose the optimal experimental plan tailored to your objectives.

• Other polymer materials

Co-rotating twin-screw extruder The screw shape can be changed by rearranging the segmented mixing elements. 1. By changing the screw configuration, it can accommodate various compounds. 2. The screw rotation speed can be set from 50 to 400 rpm, allowing for a wide range of variability in shear rate and surface renewal. 3. With a discharge capacity of 5 to 100 kg/h (for materials like PE), it can handle everything from small-scale formulation studies to large-scale prototypes. 4. The high-performance vacuum degassing system can remove volatile components and oligomers. Additionally, it is possible to perform "degassing extrusion" of polyester materials (such as PET, PBT, PC, etc.) without pre-drying, depending on the conditions.

• Other polymer materials

A Scanning Electron Microscope (SEM) is a device that allows for the magnified observation of surface structures by using secondary electrons and backscattered electrons emitted from the surface as a result of the interaction between an incident electron beam and the constituent atoms of a material. It is widely used for the observation of polymer materials. Additionally, the updated SEM now incorporates an Energy Dispersive X-ray Spectroscopy (EDS) system, enabling elemental analysis (from boron (B) to uranium (U)) and elemental mapping at specific points on the SEM observation screen.

• Contract Analysis

Since July 2006, the Restriction of Hazardous Substances Directive (RoHS) has been enforced in Europe, regulating the presence of cadmium, lead, mercury, hexavalent chromium, and certain brominated flame retardants in electronic and electrical components. The management of such chemicals has been spreading not only in Europe but also in various countries due to the growing concern over environmental issues in recent years. Not only manufacturers of sets but also component and material manufacturers must prove that their products, components, and materials do not contain hazardous chemicals (below permissible levels). At DJK, we provide efficient and high-precision RoHS analysis data using the latest analytical equipment.

• Contract Analysis

ICP-AES targets liquid samples, so solid samples must be dissolved by some method; however, it has features such as the ability to analyze multiple elements simultaneously and a wide dynamic range. This ICP emission analysis allows for qualitative and quantitative analysis of metals in samples as well as qualitative and quantitative analysis of leached metals.

• Contract Analysis

Non-destructive analysis has the characteristic of being able to analyze both liquid and solid samples, and it is widely used as a rapid and simple elemental analysis method. Although the accuracy may decrease, quantitative analysis is also possible, making it ideal for screening analysis of unknown samples.

• X-ray inspection equipment

The intrinsic viscosity [η] of the polymer diluted solution is determined using a capillary viscometer, and the viscosity equation [η] = KM^a is used to calculate M (the viscosity average molecular weight).

• Viscometer

This method utilizes the pores of a filler used as a stationary phase to separate sample molecules in order of increasing molecular size, and is also known as size exclusion chromatography (SEC). Larger molecules penetrate the pores of the gel less and move through the column and elute faster than smaller molecules. In this way, by separating and eluting based on molecular size, and using the differences in refractive index (RI) between the solvent and the sample solution or the absorption of functional groups (UV) to detect concentration, a distribution of molecules can be obtained.

• Contract Analysis

TG (Thermogravimetry) is a technique that measures the mass of a substance as a function of temperature while changing the temperature according to a controlled program. DTA (Differential Thermal Analysis) is a technique that measures the temperature difference between a substance and a reference material as a function of temperature while changing the temperatures of both according to a controlled program. TG-DTA performs these two measurements simultaneously, allowing for the observation of endothermic and exothermic behavior during decomposition, as well as determining glass transition temperatures and melting points.

• Contract Analysis

Our company is equipped with both input compensation type and heat flux type DSC devices, and we conduct various thermal analysis measurements that leverage the characteristics of each device. DSC (Differential Scanning Calorimeter) is one of the main methods of thermal analysis, used to measure the thermal properties of substances as collections of atoms and molecules. It is defined as a technique that measures the difference in energy input to a substance and a reference substance as the temperature of both is varied according to a programmed schedule. It has become an important analytical tool for polymer materials.

• Other polymer materials

We will analyze the concentrations of various functional groups (carboxyl groups, hydroxyl groups, epoxy equivalents, amino groups, etc.) at the ends (or side chains) of oligomers and polymers using titration methods.

• Other polymer materials

GC-MS is an analytical device that directly connects GC (Gas Chromatography) and MS (Mass Spectrometry), utilizing the excellent separation capabilities of GC for volatile component mixtures and the strengths of MS for qualitative analysis and structural determination.

• Other polymer materials

This system consists of the FT/IR-4200 main unit and the IRT-3000-32AL microscope IR, which allows for the observation of small parts. Please use it for qualitative analysis of unknown materials, contamination analysis, and troubleshooting.

• Contract Analysis

Molecules composed of multiple atoms vibrate in complex ways. These vibrations have characteristic frequencies (natural vibrations, reference vibrations, etc.) specific to the molecular composition. When infrared radiation is applied, these vibrations produce a unique absorption spectrum for the molecule. Based on this spectrum, it is possible to identify substances and perform quantitative analysis using specific absorption bands. This method has become an extremely useful analytical tool for the identification of organic compounds and polymer materials.

• Other polymer materials

We conduct various modification reactions such as grafting modification reactions, polymer reactions, polymerization using chain extenders, end group capping, and functional group introduction at the flask level or through reactive processing using a twin-screw extruder. We also accommodate studies on surface modification of materials.

• Other polymer materials

We will synthesize existing thermosetting and UV-curable resins such as epoxy, phenol, polyester, alkyd, and acrylate on a beaker scale. We also accept commissioned research on the synthesis of new resins.

• Other polymer materials

We conduct the synthesis and prototyping of various polymers, focusing on radical polymerization and addition polymerization systems, at the lab level (beaker scale). We can accommodate both cases where the synthesis pathway and conditions are known, as well as situations where this information is lacking and the examination of synthesis methods and polymerization conditions is necessary.

• Other polymer materials

Leveraging our long-standing experience as a specialized institution in polymer synthesis research, we undertake commissioned research for the development of new polymers tailored to various purposes and applications, including heat-resistant polymers, graft and block polymers, and functional polymers with introduced functional groups.

• Other polymer materials

Based on application-specific environmental testing, we conduct durability tests and lifespan predictions for resin and rubber materials, as well as reliability evaluations for plastic products, through assessments such as creep tests, weather resistance tests, thermal aging tests, cycle tests, chemical resistance tests, and permeability tests.

• Other polymer materials

From the fundamental property evaluation of new materials developed by our customers to product quality control, various physical property evaluation tests are possible. Our main measuring instruments are regularly calibrated to ensure constant traceability, and we can accommodate a wide range of tests from standard-compliant tests (JIS, ISO, ASTM) to non-standard tests.

• Other polymer materials

We accept various molding processing tests (moldability and melt flow evaluation, condition examination, prototype production, etc.) using methods such as extrusion molding, injection molding, and compression molding. We can accommodate a wide range of materials, from general-purpose thermoplastics to engineering plastics, super engineering plastics, and thermosetting resins.

• Strength Testing Equipment

We conduct various mixing tests such as the mixing of plastics, polymer materials, and various additives, composite material creation, polymer alloys, and reactive extrusion. We cater to various needs, including optimization of mixing conditions, sample collection for evaluation tests, and prototyping (small to medium quantities).

• Other polymer materials

This is a service that conducts structural analysis of polymers, molecular weight measurement, composition analysis, as well as thermal analysis, thermal properties such as rheology, various elemental analyses including heavy metals, elution tests, and other various analytical tests. Additionally, leveraging years of expertise, we perform component analysis and total composition analysis of various compounded materials (compounds, electronic materials, paints, adhesives, etc.).

• Contract Analysis

We will flexibly respond to various needs such as the synthesis of polymers with established synthetic routes, small-scale production of existing polymers using conventional and known methods, optimization of polymerization conditions, and research and development of newly designed polymers.

• Other polymer materials