天津恒新科技有限公司

Company ：Introduction | Why HengSin Tech ？

Products ：Medical PVC compounds | Specialty Resins | Cap liners | Cleaning Systems | Pharma Packaging Materials

Colorite is a market leader in the manufacture and supply of PVC compounds for the medical device industry. For forty years, Colorite has won the confidence of its customers with premium quality products and first-class service. Their products have regulatory approval and meet the requirements of the United States, European and Japanese Pharmacopoeia.

Guidelines for Flexible Compounds

Colorite flexible compounds for injection moulding have been formulated to optimize processing performance and heat stability.

General Conditions

Screw Design: G.P. type with check valve

Compression ratio: 2:1 to 3:1

Screw Speeds: 40-100 rpm

Back Pressure: 7-30 bar

Temperature Profiles

Standard cool-to-hot (hopper to adaptor) profiles are adequate. Screw design may dictate special profile adjustments.

Typical Physical Properties

Shore A Hardness	Typical Temperature Profile Range (⁰C)	Recommended Melt Temperature (⁰C)
40 – 50	135 – 160	145 – 155
50 – 60	140 – 165	155 – 160
60 – 70	145 – 170	160 – 165
70 – 80	150 – 175	165 – 175
80 – 90	155 – 180	170 – 180

*NB: Melt temperature should be determined in an air shot under actual processing conditions.

Mould

Stainless steel preferred, ample gating with radiuses in the runners.

Mould temperature: 10-40^0C

Extrusion Guidelines for Flexible Compounds

Colorite compounds are supplied in a completely fluxed pellet form. Thus, extrusions of these compounds are consistent and smooth with excellent melt stability.

Machine Type

Conventional 24:1 L/D machines equipped with good barrel temperature control. An L/D ratio less than 24:1 may cause problems in product quality due to insufficient residence time. Longer barrels are suitable but require more precise heat control.

Screws

Screw compression ratios should be in the range of 2.5:1 to 3.5: 1. Two stage designs, double-start flights, Maddox sections, and mix-ins have all been used successfully. Screw cooling is generally not required.

Dies and Adaptors

Low inventory and smooth flow channels are required to get the maximum run longevity and predictable extrudate characteristics. Use of a screen pack is also recommended. Pitted or nicked surfaces may create degraduation problems.

Temperature Profiles

Standard cool-to-hot (hopper to adaptor) profiles are adequate. Screw design may dictate special profile adjustments.

Typical Physical Properties

Shore A Hardness	Typical Temperature Profile Range (⁰C)	Recommended Melt Temperature (⁰C)
50 – 60	140 – 165	155 – 160
60 – 70	145 – 170	160 – 165
70 – 80	150 – 175	165 – 175
80 – 90	155 – 180	170 – 180

Shore A Hardness Compared with English Standard

English Standard No.	0	1	2	3	4	5	6	7	8	9
0	100	100	100	100	99	99	99	98	98	97
10	97	96	95	95	94	93	93	92	92	91
20	90	89	89	88	87	86	86	85	84	84
30	83	82	82	81	80	80	79	78	78	77
40	77	76	75	75	74	74	73	73	72	71
50	71	70	70	69	69	68	68	67	67	66
60	66	65	65	64	64	63	63	62	62	62
70	61	61	60	60	59	59	59	58	58	57
80	57	57	56	56	56	55	55	54	54	54
90	53	53	53	52	52	52	51	51	51	50
100	50	50	49	49	49	48	48	48	48	47
110	47	47	46	46	46	46	45	45	45	45
120	44	44	44	43	43	43	43	42	42	42
130	42	42	41	41	41	41	40	40	40	40
140	40	39	39	39	39	38	38	38	38	38
150	37	37	37	37	37	36	36	36	36	36
160	35	35	35	35	35	35	34	34	34	34
170	34	34	34	33