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Cara memecahkan masalah penyok permukaan dan jamur pada cetakan injeksi

2025-08-05

Cara memecahkan masalah penyok permukaan dan jamur pada cetakan injeksi

Titik cekung di permukaan cetakan injeksi

Fenomena: bintik -bintik cekung di permukaan bingkai wajah

Alasan: Selama cetakan injeksi in-mold dari bahan lembar IML, banyak titik cekung muncul di permukaan produk.

Analisis: Ada sedikit debu di permukaan lembaran PC. Kebersihan udara di lingkungan tidak tinggi, dan ada banyak debu, yang menyebabkan depresi terjadi ketika lembaran ditempatkan di cetakan untuk cetakan injeksi.

（1） Karakteristik mesin cetakan injeksi

Grade: Demag, Clamping Force: 50t, Plastisisasi Kapasitas: 42g.

（2） Karakteristik jamur

Nomor ejeksi cetakan: 1 × 2, Metode Injeksi Lem: Gerbang Titik, Metode Ejeksi: Ejeksi dengan pin ejector, suhu cetakan: 70 ° C (mesin suhu konstan)

（3） Bukti fisik produk

Bahan: ABS PA758, Warna: Transparan, Berat Produk (Single Piece): 2.4G, bobot sariawan: 8.44g.

（4） Analisis penyebab cacat

1. Ada sedikit debu di permukaan lembaran PC. Ketika ditempatkan dalam cetakan untuk cetakan injeksi, bintik -bintik debu disuntikkan ke permukaan produk.

2. Lingkungan udara bersih dengan banyak debu. Ketika cetakan dibuka, debu melekat pada permukaan inti cetakan depan dan menyebabkan titik cekung ketika cetakan berikutnya didaur ulang.

（5） Penanggulangan

1. Bersihkan permukaan bahan lembaran secara manual untuk meminimalkan titik debu.

2. Murni kemurnian udara dan secara teratur membersihkan mesin dan lingkungan sekitarnya.

Tabel proses cetakan injeksi

Mesin cetakan injeksi: demag50t, sekrup tipe B, kapasitas injeksi 42g			Nama Produk: Bingkai Wajah S10
Bahan Baku: ABS PA785	Warna: Transparan	Suhu pengeringan: 80 ° C.	Metode Pengeringan: Pengering Dehumidifying	Waktu pengeringan: 2 jam	Penggunaan Bahan Daur Ulang: 0
Finished product weight: 2.4g×2=4.8g		Nozzle weight: 8.44g	Mold output: 1×2	Gate injection method: Point gate

Barrel temperature					Mold temperature	Use machines	"Settings	"Actual
1	2	3	4	5	before	Water temperature machine	70°C	62°C
260°C	255°C	250°C	220°C	/	before	Water temperature machine	70°C	62°C
△	△	△	△	△	after	Water temperature machine	70°C	59°C
△	△	△	△	△	after	Water temperature machine	70°C	59°C

	/	50	Holding pressure	Pressure-holding position		100	110	120	Injection pressure
	/	3	Holding pressure time	12		12			Injection position
Residual amount of injection glue			10	/	55	3			Injection velocity
7.8			/	/	12	23.5			Velocity of fire position

Intermediate time	Injection time	Cooling time	The entire duration	Back pressure	Rotational speed	Retraction speed	Material quantity position	Retraction position
1	5	10	25	5	10 15 10	10	38	3

Mold closing protection time	Supervise the feeding time	Clamping force	Ejection length	Ejection times	Rotation position	Blowing delay	Blowing time
1	10	60	45	1	15 35 38	/	/

8052

Mould_Taizhou jiifeng Mould Co.,Ltd. (jfmoulds.com)

The injection mold is moldy

Reason: This is an IML injection molded product. Due to the temperature difference on the mold surface when the sheet is installed, it forms a semi-transparent state.

Analysis: High speed will cause material melting, intensify shearing, generate high temperatures and be prone to decomposition. The surface temperature of the mold is too low. The temperature of the material pipe is too low.

（1）Characteristics of injection molding machines

Grade: DEMAG (Ningbo), clamping force: 50t, plasticizing capacity: 42g.

（2） Karakteristik jamur

Mold ejection number: 1×2, glue injection method: point gate, ejection method: Ejection by ejector pin, mold temperature: 60°C (constant temperature machine)

（3） Bukti fisik produk

Material: ABS PA758, Color: Transparent, Product weight (single piece) : 2.43g, sprue weight 8.44g.

（4） Analisis penyebab cacat

The mold temperature is low, and the inlet method is potential inlet. The molten material flows to the vicinity of the inlet. Due to the excessive speed and the very smooth surface of the mold, high shear occurs, causing the molten material to heat up rapidly in an instant, until the surface turns white and forms a semi-transparent state.

（5） Countermeasures

1. Memanfaatkan injeksi multi-level dan switching posisi.

2. Appropriately increase the mold temperature to allow the product to cool down slowly in the mold.

3. Appropriately increase the temperature of the melt cylinder to enhance the transparency of the product.

Tabel proses cetakan injeksi

Injection molding machine: Demag 50T, Type B screw, injection capacity 42g			Product Name: S10 Face Frame
Raw material: ABS PA758	Warna: Transparan	Suhu pengeringan: 80 ° C.	Metode Pengeringan: Pengering Dehumidifying	Waktu pengeringan: 2 jam	Penggunaan Bahan Daur Ulang: 0
Finished product weight: 2.43g×2=4.86g		Nozzle weight: 8.44g	Mold output: 1×2	Gate injection method: Point gate

Barrel temperature					Mold temperature	Use machines	"Settings	"Actual
1	2	3	4	5	before	Oil temperature control machine	80°C	73°C
242°C	236°C	227°C	200°C	/	before	Oil temperature control machine	80°C	73°C
△	△	△	△	△	after	Oil temperature control machine	80°C	67°C
△	△	△	△	△	after	Oil temperature control machine	80°C	67°C

	/	50	Holding pressure	Pressure-holding position		100	110	120	Injection pressure
	/	3	Holding pressure time	12		12			Injection position
Residual amount of injection glue		/	10	/	55	3			Injection velocity
7.8		/	/	/	12	23.5			Velocity of fire position

Intermediate time	Injection time	Cooling time	The entire duration	Back pressure	Rotational speed	Retraction speed	Material quantity position	Retraction position
1	5	10	25	5	10 15 10	10	38	3

Mold closing protection time	Supervise the feeding time	Clamping force	Ejection length	Ejection times	Rotation position	Blowing delay	Blowing time
1	10	60	45	1	15 35 38	/	/