PP ABS Plastic Kitchen Parts Customization moulding

In addition, our company has established cooperative relationships with plastic raw material suppliers, printing manufacturers, etc. to ensure the supply of raw materials and printing quality. Through our rich experience and perfect supply chain, our company can provide customers with high-quality customized PP ABS Plastic Kitchen Parts Customization moulding products to meet their specific needs. At the same time, we have 10 years of professional foreign trade service experience, understand the foreign trade process, and better serve our customers. For PP ABS Plastic Kitchen Parts Customization moulding products, we can make corresponding plastic parts, which is mainly done through injection molds.

## Injection Molding Process (Parameters broken down, with a focus on key differences)

### ✅ Food-Grade Copolymer PP (For parts in contact with food; applies to items like draining baskets and storage containers)

- Drying: Generally not required; if damp, dry at 60–70°C for 2–3 hours.

- Barrel Temperature: 180–190–200–210°C; Nozzle: 200–210°C. Avoid temperatures above 225°C for extended periods.

- Mold Temperature: 45–60°C; for items intended for boiling-water contact, set to 50–60°C to ensure uniform crystallization and minimize post-molding shrinkage.

- Back Pressure: 5–8 bar; keep low to minimize shear, which can cause material degradation and unpleasant odors.

- Holding Pressure: Use multi-stage holding pressure to prevent warping at the openings; for large parts, use a cooling/setting fixture upon ejection.

- Controls: Use food-grade masterbatch; regrind is limited to clean, in-house sprues/runners only; the use of oil-based mold release agents is strictly prohibited.

### ✅ Food-Grade ABS (For structural components not in contact with food; focus on preventing internal stress)

- Drying: **ABS must be dried!** Crucial step**: Dry at 80°C for 2–4 hours until moisture content is <0.03%; otherwise, silver streaks and bubbles may occur.

- Barrel temperature: 200–210–220–230°C; do not exceed 240°C, as ABS decomposes easily at high temperatures, releasing acrylonitrile—leading to unpleasant odors and a sharp increase in migration risks.

- Mold temperature: 60–80°C (a higher mold temperature reduces internal stress, making the part less prone to cracking after spray painting).

- Back pressure: 8–12 bar (higher than that for PP) to ensure a uniform melt.

- Injection speed: Moderate and steady; high-speed shearing of ABS can easily induce internal stress.

- Holding pressure: Moderate; excessive holding pressure can cause high internal stress, leading to cracking during subsequent assembly, thermal cycling, or after spray painting.

- Cooling: Ensure sufficient cooling; the part should not be ejected at too high a temperature, as ABS is prone to deformation.

- Annealing (recommended for ABS parts intended for spray painting): Maintain at 70–75°C for 1–2 hours to relieve internal stress and prevent cracking after painting.

## IV. Production & Factory Audit Compliance (Key Focus Areas for Audits of Kitchenware Made of PP/ABS)

1. Material segregation: Store food-grade PP, ABS, masterbatches, and additives separately. Ensure that ABS dust or regrind does not contaminate food-grade PP components.

2. Separate documentation:

- PP: Must comply with GB 4806.7, EU 10/2011, and/or FDA standards.

- ABS: If claimed to be food-contact, a separate migration test report is required. If it is not intended for food contact, this must be explicitly stated on the technical drawings and specifications (e.g., "This component is not for food contact") to mitigate audit risks.

3. Regrind management: ABS regrind poses a higher risk, as degraded ABS contains a greater number of small-molecule substances. Never mix ABS regrind into food-contact PP components (any such contamination will cause the parts to fail migration testing).

4. Post-processing:

- ABS spray painting: If the painted surface could potentially come into indirect contact with food, the paint/ink used must also comply with the relevant food-contact safety requirements. - ABS sanding dust: The sanding process must be physically separated from the PP food-contact molding area to prevent dust from contaminating the PP products.

5. Batch Traceability: PP and ABS components must have separate batch numbers. Assembly records must be linked to these batch numbers to facilitate traceability in the event of customer complaints.

## V. Common Pitfalls with This Combination

1. PP expands after boiling, causing it to jam against the ABS bracket → Insufficient clearance; failure to account for the thermal expansion of PP.

2. ABS bracket cracks after a period of use or exposure to hot steam → High internal stress in the ABS, low mold temperature, lack of annealing, or excessive interference/engagement in the snap-fit design.

3. ABS component cracks after spray painting → Internal molding stress, insufficient drying, or excessive holding pressure.

4. Material contamination: ABS regrind mixed into food-grade PP → Results in black specks, unpleasant odors, and migration levels exceeding limits (a major quality incident).

5. Surface defects on ABS (flow marks, "silver streaks") → Inadequate drying of the material.

6. Inconsistent gaps between assembled PP and ABS components → Both molds were designed using the same shrinkage rate value.

7. ABS turns white or cracks after prolonged contact with dish soap → Incorrect material selection; ABS is not resistant to immersion in detergents.

We are a PP ABS Plastic Kitchen Parts Customization moulding manufacturer, providing high-quality PP ABS Plastic Kitchen Parts Customization moulding manufacturing. As long as you want to customize/develop PP ABS Plastic Kitchen Parts Customization moulding products, you can find us. We have professional injection mold design and mature manufacturing technology, providing you with one-stop service, from product design-mold making-product production-product packaging-product transportation, we can help you in every link. As long as you come to us, we will provide you with the ultimate service and satisfy you in terms of product quality, production time, information dialogue, etc.

Plastic Injection Mould making

Plastic molding specifications

Mold design:

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Product packaging

Factory

We are Custom Plastic Mold factory. Our factory is plastic injection mold maker. we has 17 years of experience in professional custom plastic mold and 10 years of foreign trade experience. We are custom Plastic Mold supplier. We can provide custom Plastic Mold service. Our factory can make the Injection molded plastic parts, and the quality of the products will satisfy you.

We have more than 50 high-end machines and hundreds of engineers and designers. We can provide one-stop service, from product design - mold making - product production - product packaging - transportation. We have a complete production chain. We can meet all your requirements.

Services we provide:

Professional custom mold service, Plastic mold design and manufacturing .plastic product production, product design, mold design, blow mold customization, rotational mold customization, die-casting mold customization. 3D printing services, CNC manufacturing services, product packaging, customized packaging, shipping services.

We always adhere to the principles of quality first and time first. While providing customers with the highest quality products, try to maximize the production efficiency and shorten production time. We are proud to tell every customer that our company has not lost any customer since its establishment.If there is a problem with the product, we will seek a solution actively and take responsibility to the end.

FAQ

Q1: Are you trading company or manufacturer ?

A: We are manufacturers.

Q2. When can I get the quotation?

A: We usually quote within 2 days after we get your inquiry.

If you are very urgent, please call us or tell us in your email so that we can quote for you first.

Q3. How long is the lead-time for mold?

A: It all depends on the products' size and complexity. Normally, the lead time is 25 days.

Q4. I have no 3D drawing, how should I start the new project?

A: You can supply us a molding sample, we will help you finish the 3D drawing design.

Q5. Before shipment, how to make sure the products quality?

A: If you don't come to our factory and also don't have the third party for inspection, we will be as your inspection worker.

We will supply you a video for production process detail include process report, products size structure and surface detail, packing detail and so on.

Q6. What is your payment terms?

A: Mold Payment: 40% deposit by T/T in advance, 30% second mold payment before sending out the first trial samples, 30% mold balance after you agree the final samples.

B:Production Payment: 50% deposit in advance, 50% before sending out the final goods.

Q7: How do you make our business long-term and good relationship?

A:1. We keep good quality and competitive price to ensure our customers benefit for best quality products.

2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.